Carrier Transicold 69NT40-454 Operation Manual PDF

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Summary of Content for Carrier Transicold 69NT40-454 Operation Manual PDF

Models 69NT20-274 69NT40-441 69NT40-444 69NT40-454

T-246-10

Carrier Transicold Division, Carrier Corporation, P.O. Box 4805, Syracuse, N.Y. 13221

SERVICE MANUAL OPERATION AND

Carrier Corporation 1993 D Printed in U. S. A. 0593

CONTAINER REFRIGERATION UNIT

MODELS 69NT20-274 69NT40-441 69NT40-444 69NT40-454

i

TABLE OF CONTENTS Section Page 1 DESCRIPTION 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.1 Introduction 1-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.2 General Description 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.3 Refrigeration System Data 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.4 Electrical Data 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5 Voltage Switch and Power Transformer (Optional) 1-8. . . . . . . . . . . . . . . . . . . . . . . . . . . 1.6 Fresh Air Makeup Vent 1-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.7 Safety and Protective Devices 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.8 Refrigeration Circuit 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.9 Water-Cooled Condenser (Optional) 1-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.9.1 Water-Cooled Condenser with Water Pressure Switch 1-11. . . . . . . . . . . . . . . 1.9.2 Water-Cooled Condenser with Condenser Fan Switch (CFS) 1-11. . . . . . . . . .

1.10 Remote Monitoring (Optional) 1-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.10.1 Remote Monitoring Plug 1-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.10.2 Remote Monitoring Receptacle 1-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.11 Suction Solenoid Valve 1-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.12 Frost Formation On Compressors 1-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.13 Computer Control --- Electronics Center 1-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1.13.1 Brief Description 1-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.13.2 General Layout of Control Center 1-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.13.3 Microprocessor Temperature Control 1-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.13.4 Function and Data Codes 1-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.13.5 Alarms 1-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.13.6 Pre-Trip Inspection 1-21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.13.7 DataCORDER (Optional) 1-22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.13.8 Communications 1-23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.13.9 Setting Function Codes Without AC Power (Optional) 1-24. . . . . . . . . . . . . .

1.14 USDA Battery Module (Optional) 1-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.15 USDA Cold Treatment Procedure 1-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.16 Nitrogen Feed (Optional) 1-26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.17 Humidistat (Optional) 1-26. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 OPERATION 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.1 Pre-Trip Inspection (Before Starting) 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.2 Starting and Stopping Instructions 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.3 After Starting Inspection 2-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.4 Unit Operation 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

2.4.1 Cooling --- Controller Set Below ---10_C (+14_F) 2-2. . . . . . . . . . . . . . . . . . . 2.4.2 Controller Set Above ---10_C (+14_F) 2-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . 2.4.3 Defrost 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3 TROUBLESHOOTING 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.1 Unit Will Not Start or Starts Then Stops 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.2 Unit Runs But Has Insufficient Cooling 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3 Unit Operates Long or Continuously In Cooling 3-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.4 Unit Will Not Heat or Has Insufficient Heating 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.5 Unit Will Not Terminate Heating 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.6 Unit Will Not Defrost Properly 3-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.7 Abnormal Pressures (Cooling) 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.8 Abnormal Noise or Vibrations 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.9 Temperature Controller Malfunction 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.10 No Evaporator Air Flow or Restricted Air Flow 3-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.11 Expansion Valve Malfunction 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.12 Water-Cooled Condenser or Water Pressure Switch Malfunction 3-4. . . . . . . . . . . . . . . 3.13 Step-Up Power Transformer Malfunction 3-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

iiRevised 8-6-93

TABLE OF CONTENTS (CONTINUED) Section Page 4 SERVICE 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.1 Removing the Refrigerant 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.2 Refrigerant Leak Checking 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3 Evacuation and Dehydration 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.3.1 General 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3.2 Preparation 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3.3 Procedure 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.4 Adding or Checking the Refrigerant Charge 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4.1 Checking the Refrigerant Charge 4-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.4.2 Adding Refrigerant to System (Full Charge) 4-2. . . . . . . . . . . . . . . . . . . . . . . . 4.4.3 Adding Refrigerant to System (Partial Charge) 4-2. . . . . . . . . . . . . . . . . . . . .

4.5 Replacing the Compressor 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.6 Compressor Disassembly 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.7 Compressor Reassembly 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.8 Checking the Compressor Oil Level 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.9 Checking or Replacing Moisture-Liquid Indicator 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . 4.10 Checking or Replacing the Filter-Drier 4-8. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.11 Checking or Replacing High Pressure Switch 4-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.11.1 Replacing High Pressure Switch 4-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.11.2 Checking High Pressure Switch 4-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4.12 Servicing Quench Solenoid Valve (QV) 4-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.13 Replacing the Evaporator Coil and Heater Assembly 4-9. . . . . . . . . . . . . . . . . . . . . . . . . 4.14 Replacing the Evaporator Fan and Motor Assembly 4-10. . . . . . . . . . . . . . . . . . . . . . . . . . 4.15 Servicing the Evaporator Coil Heaters 4-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.16 Condenser Coil 4-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.17 Condenser Fan and Motor Assembly 4-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.18 Recording Thermometer (Partlow) 4-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.19 Recording Thermometer (Saginomiya) 4-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.20 Rust Prevention and Maintenance of Painted Surfaces 4-13. . . . . . . . . . . . . . . . . . . . . . . 4.21 Servicing the Water-Cooled Condenser 4-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.22 Checkout Procedure for Optional Power Transformer 4-15. . . . . . . . . . . . . . . . . . . . . . . . 4.23 Temperature Controller and Recorder Sensor Checkout Procedure 4-15. . . . . . . . . . . . .

4.23.1 Replacing Temperature Sensor 4-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.24 Servicing Suction Solenoid Valve (69NT40 ONLY) 4-16. . . . . . . . . . . . . . . . . . . . . . . . . . . 4.25 Servicing the Modulating Solenoid Valve 4-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.26 Thermostatic Expansion Valve 4-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.27 Evaporator Fan Motor Capacitors 4-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.28 Humidistat 4-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.29 Microprocessor Controller 4-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 ELECTRICAL WIRING SCHEMATIC AND DIAGRAMS 5-1. . . . . . . . . . . . . . . . . . . . 5.1 Introduction 5-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

iii

LIST OF ILLUSTRATIONS Figure Page 1-1 Refrigeration Unit --- Front 1-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Refrigeration Unit --- Rear (Panels Removed) 1-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Water-Cooled Condenser/Receiver Section 1-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Control Box 1-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 Refrigeration Circuit 1-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 Frost Pattern on Compressors 1-12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7 Microprocessor Control Panel 1-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8 USDA Battery Module 1-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9 Controller Set Point Below ---10_C (+14_F) 1-27. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-10 Controller Set Point Above ---10_C (+14_F) 1-28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 Cooling 2-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2 Heating Mode 2-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3 Defrost 2-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1 Vacuum Pump Connections 4-1. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 Compressor --- Model 06DR 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 Oil Pump 4-3. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4 Exploded View of Valve Plate 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5 Bottom Plate Removed 4-4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 Vane Oil Pump and Bearing Head 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7 Gear Oil Pump and Bearing Head 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-8 Motor End Cover 4-5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-9 Crankshaft Assembly 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-10 Removing Equalizing Tube and Lock Screw Assembly 4-6. . . . . . . . . . . . . . . . . . . . . . . . 4-11 Terminal Mounting Assembly 4-6. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-12 Suction Valve and Positioning Springs 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-13 Piston Rings 4-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-14 Typical Setup for Testing High Pressure Switch 4-9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-15 Evaporator Fan Locating Dimension 4-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-16 Partlow Recording Thermometer 4-11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17 Saginomiya Recording Thermometer 4-13. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18 Water-Cooled Condenser Cleaning 4-14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19 Sensor 4-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20 Sensor and Cable Assembly 4-15. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21 Suction Solenoid Valves --- Sporlan 4-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22 Suction Solenoid Valves --- Alco 4-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23 Modulating Solenoid Valve 4-17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24 Thermostatic Expansion Valve 4-18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25 Humidistat 4-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26 Microprocessor Control Box 4-21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1 Electrical Wiring Schematic (Models 69NT40-444 & 444-2) 5-2. . . . . . . . . . . . . . . . . . . 5-2 Electrical Wiring Diagram (Models 69NT40-444 & 444-2) 5-4. . . . . . . . . . . . . . . . . . . . . 5-3 Electrical Wiring Schematic (Model 69NT40-444-1) 5-6. . . . . . . . . . . . . . . . . . . . . . . . . . 5-4 Electrical Wiring Diagram (Model 69NT40-444-1) 5-8. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5 Electrical Wiring Schematic (Model 69NT40-444-3) 5-10. . . . . . . . . . . . . . . . . . . . . . . . . . 5-6 Electrical Wiring Diagram (Model 69NT40-444-3) 5-12. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7 Electrical Wiring Schematic (Model 69NT40-444-4) 5-14. . . . . . . . . . . . . . . . . . . . . . . . . . 5-8 Electrical Wiring Diagram (Model 69NT40-444-4) 5-16. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-9 Electrical Wiring Schematic (Model 69NT40-454) 5-18. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10 Electrical Wiring Diagram (Model 69NT40-454) 5-20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-11 Electrical Wiring Schematic (Model 69NT20-274) 5-22. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12 Electrical Wiring Diagram (Model 69NT20-274) 5-24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-13 Electrical Wiring Schematic (Model 69NT20-274-1) 5-26. . . . . . . . . . . . . . . . . . . . . . . . . . 5-14 Electrical Wiring Diagram (Model 69NT20-274-1) 5-28. . . . . . . . . . . . . . . . . . . . . . . . . . .

ivRevised 8-6-93

LIST OF ILLUSTRATIONS (CONTINUED) Figure Page 5-15. Electrical Wiring Schematic (Model 69NT40-444-6) 5-30. . . . . . . . . . . . . . . . . . . . . . . . . . 5-16. Electrical Wiring Diagram (Model 69NT40-444-6) 5-32. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-17. Electrical Wiring Schematic (Model 69NT40-454-1) 5-34. . . . . . . . . . . . . . . . . . . . . . . . . . 5-18. Electrical Wiring Diagram (Model 69NT40-454-1) 5-36. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-19. Electrical Wiring Schematic (Model 69NT40-444-9) 5-38. . . . . . . . . . . . . . . . . . . . . . . . . . 5-20. Electrical Wiring Diagram (Model 69NT40-444-9) 5-40. . . . . . . . . . . . . . . . . . . . . . . . . . . 5-21. Electrical Wiring Schematic (Model 69NT40-444-11) 5-42. . . . . . . . . . . . . . . . . . . . . . . . . 5-22. Electrical Wiring Diagram (Model 69NT40-444-11) 5-44. . . . . . . . . . . . . . . . . . . . . . . . . . 5-23. Electrical Wiring Schematic (Model 69NT40-444-10) 5-46. . . . . . . . . . . . . . . . . . . . . . . . . 5-24. Electrical Wiring Diagram (Model 69NT40-444-10) 5-48. . . . . . . . . . . . . . . . . . . . . . . . . . 5-25. Electrical Wiring Schematic (Models 69NT40-444-7 & 444-8) 5-50. . . . . . . . . . . . . . . . . . 5-26. Electrical Wiring Diagram (Models 69NT40-444-7 & 444-8) 5-52. . . . . . . . . . . . . . . . . . . 5-27. Electrical Wiring Schematic (Model 69NT40-444-12) 5-54. . . . . . . . . . . . . . . . . . . . . . . . . 5-28. Electrical Wiring Diagram (Model 69NT40-444-12) 5-56. . . . . . . . . . . . . . . . . . . . . . . . . . 5-29. Electrical Wiring Schematic (Models 69NT40-454-2 & -454-3) 5-58. . . . . . . . . . . . . . . . . 5-30. Electrical Wiring Diagram (Models 69NT40-454-2 & -454-3) 5-60. . . . . . . . . . . . . . . . . . 5-31. Electrical Wiring Schematic (Model 69NT20---274-2) 5-62. . . . . . . . . . . . . . . . . . . . . . . . . 5-32. Electrical Wiring Diagram (Model 69NT20---274-2) 5-64. . . . . . . . . . . . . . . . . . . . . . . . . . 5-33. Electrical Wiring Schematic (Model 69NT40-444-13) 5-66. . . . . . . . . . . . . . . . . . . . . . . . . 5-34. Electrical Wiring Diagram (Model 69NT40-444-13) 5-68. . . . . . . . . . . . . . . . . . . . . . . . . . 5-35. Electrical Wiring Schematic (Model 69NT40-444-14) 5-70. . . . . . . . . . . . . . . . . . . . . . . . . 5-36. Electrical Wiring Diagram (Model 69NT40-444-14) 5-72. . . . . . . . . . . . . . . . . . . . . . . . . . 5-37. Electrical Wiring Schematic (Model 69NT40-444-15) 5-74. . . . . . . . . . . . . . . . . . . . . . . . . 5-38. Electrical Wiring Diagram (Model 69NT40-444-15) 5-76. . . . . . . . . . . . . . . . . . . . . . . . . . 5-39. Electrical Wiring Schematic (Model 69NT40-444-16) 5-78. . . . . . . . . . . . . . . . . . . . . . . . . 5-40. Electrical Wiring Diagram (Model 69NT40-444-16) 5-80. . . . . . . . . . . . . . . . . . . . . . . . . . 5-41. Electrical Wiring Schematic (Model 69NT40-444-17) 5-82. . . . . . . . . . . . . . . . . . . . . . . . . 5-42. Electrical Wiring Diagram (Model 69NT40-444-17) 5-84. . . . . . . . . . . . . . . . . . . . . . . . . . 5-43. Electrical Wiring Schematic (Model 69NT20---274-3) 5-86. . . . . . . . . . . . . . . . . . . . . . . . . 5-44. Electrical Wiring Diagram (Model 69NT20---274-3) 5-88. . . . . . . . . . . . . . . . . . . . . . . . . . 5-45. Electrical Wiring Schematic (Model 69NT40-444-18) 5-90. . . . . . . . . . . . . . . . . . . . . . . . . 5-46. Electrical Wiring Diagram (Model 69NT40-444-18) 5-92. . . . . . . . . . . . . . . . . . . . . . . . . . 5-47. Electrical Wiring Schematic (Model 69NT40-444-19) 5-94. . . . . . . . . . . . . . . . . . . . . . . . . 5-48. Electrical Wiring Diagram (Model 69NT40-444-19) 5-96. . . . . . . . . . . . . . . . . . . . . . . . . . 5-49. Electrical Wiring Schematic (Models 69NT40-441-21 & 69NT40-444-21) 5-98. . . . . . . . 5-50. Electrical Wiring Diagram (Models 69NT40-441-21 & 69NT40-444-21) 5-100. . . . . . . . . 5-51. Electrical Wiring Schematic

(Models 69NT40-444-20, -444-22, -444-23 & 69NT40-441-22, -23, -25) 5-102. . . . . . . . . . 5-52. Electrical Wiring Diagram

(Models 69NT40-444-20, -444-22, -444-23 & 69NT40-441-22, -23, -25) 5-104. . . . . . . . . . 5-53. Electrical Wiring Schematic (Model 69NT40-441-24) 5-106. . . . . . . . . . . . . . . . . . . . . . . . . 5-54. Electrical Wiring Diagram (Model 69NT40-441-24) 5-108. . . . . . . . . . . . . . . . . . . . . . . . . .

LIST OF TABLES Table Page 1-1 Model Chart 1-2. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 Compressor Model Number Significance Chart 1-7. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3 Safety and Protective Devices 1-10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4 Function Code Assignments 1-16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5 Alarm Indications 1-19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 Electrical Control Positions --- Above ---10_C (+14_F) 2-6. . . . . . . . . . . . . . . . . . . . . . . 2-2 Electrical Control Positions --- Below ---10_C (+14_F) 2-6. . . . . . . . . . . . . . . . . . . . . . . . 4-1 Wear Limits for Compressors 4-22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2 Compressor Torque Values 4-23. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3 Partlow Bulb Temperature-Resistance Chart 4-24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4 Controller and Recorder Sensor Temperature-Resistance Chart 4-24. . . . . . . . . . . . . . . 4-5 Recommended Bolt Torque Values 4-24. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6 Temperature-Pressure Chart --- R-12 4-25. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7 Manual Override Operation of Microprocessor 4-26. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

1-1

SECTION 1 DESCRIPTION

1.1 INTRODUCTION

This manual contains Operating Data, Electrical Data and Service Instructions for the refrigeration units listed in Table 1-1. Also Table 1-1 charts some significant differences between these models.

The unit, of lightweight aluminum frame construction, is an all electric, one piece self-contained cooling and heating refrigeration unit. The unit is designed to fit in the front of a container and to serve as the container front wall. Fork lift pockets are provided for installation and removal of the unit.

The unit is complete with a charge of R-12, compressor lubricating oil, mode indicating lights, temperature controller and is ready for operation upon installation.

Some units are dual voltage units designed to operate on 190/230 or 380/460 volts ac, 3 phase, 50-60 hertz power. (Refer to section 1.5.) Other units are designed to operate on 380/460 volts ac, 3 phase 50/60 hertz power.

Operating control power is provided by a single phase transformer which steps down the ac supply power source to 24 volts ac, 1 phase control power.

The temperature controller is a microprocessor solid state controller. Refer to section 1.13. Once the temperature controller is set at a desired container temperature, the unit will operate automatically to maintain the desired temperature within very close limits. The control system automatically selects cooling, holding or heating as necessary to maintain the desired temperature within the container.

WARNING Beware of unannounced starting of the evaporator and condenser fans. Do not open the condenser fan grille before turning power OFF and disconnecting power plug.

Some units are equipped with a Carrier Transicold DataCORDER (Microprocessor recorder). Detailed information on the DataCORDER will be found in section 1.13.7. Some units are equipped with a Partlow temperature recorder or a Saginomiya battery driven recorder.

Later models have added features to make it easy to convert to R-22. For example a low side pressure relief valve and high side pressure relief valve opens at a higher setting. Refer to Table 1-1 and electrical schematic to see whichmodels are easily converted to R-22. The electrical schematic has an R-22 option for CDV, CHT, ILC, UV& UVTthese parts can beadded to convert theunit toR-22.

Some units may have a TransFRESH controlled atmosphere system added. Contact TransFRESH Corporation, P.O. Box 1788, Salinas, CA 93902 for information on their system.

1-2Revised 8-6-93

Table 1-1. Model Chart

MODELS UNIT WEIGHT REFRIGER-

ANT 12

LB KG LB KG

69NT20-274 1200 544 9.3 4.2 X A --- --- --- X --- 69NT20-274-1 1325 601 9.0 4.1 X --- --- X --- B --- 69NT40-444 1235 560 8.8 4.0 X A --- --- --- X --- 69NT40-444-1 1215 551 8.8 4.0 --- A --- --- X B --- 69NT40-444-2 1235 560 8.8 4.0 X A --- --- --- X --- 69NT40-444-3 1360 617 12.0 5.4 X --- X X --- B --- 69NT40-444-4 1230 558 12.0 5.4 --- --- X --- X B --- 69NT40-444-6 1200 544 12.0 5.4 --- --- X --- X B --- 69NT40-454 1195 542 12.0 5.4 X X --- --- --- B ---

UNITS THAT HAVE PROVISIONS TO CONVERT TO R-22 UNI 69NT20-274-2 1175 533 9.0 4.1 X --- --- --- --- X --- 69NT20-274-3 1175 533 9.0 4.1 X --- X --- --- X C 69NT40-441-21 1265 574 12.3 5.6 --- --- X --- X B C 69NT40-441-22 1240 562 12.3 5.6 --- --- X --- X B C 69NT40-441-23 1265 574 12.3 5.6 --- --- X --- X B C 69NT40-441-24 1265 574 12.3 5.6 X --- X --- --- X C 69NT40-441-25 1240 562 12.3 5.6 --- A --- --- X B --- 69NT40-444-7 1330 603 12.0 5.4 X --- X X --- B --- 69NT40-444-8 1330 603 12.0 5.4 X --- X X --- B --- 69NT40-444-9 1210 549 12.0 5.4 X --- X --- --- X --- 69NT40-444-10 1210 549 8.8 4.0 --- A --- --- X B --- 69NT40-444-11 1210 549 12.0 5.4 X --- X --- --- X --- 69NT40-444-12 1210 549 12.0 5.4 X --- X --- --- X --- 69NT40-444-13 1210 549 12.0 5.4 X --- X --- --- X --- 69NT40-444-14 1280 580 8.5 3.8 X --- --- --- --- X --- 69NT40-444-15 1400 635 12.3 5.6 X --- X X --- B --- 69NT40-444-16 1210 549 12.0 5.4 X --- X --- --- X --- 69NT40-444-17 1380 626 12.3 5.6 X --- X X --- B --- 69NT40-444-18 1210 549 12.3 5.6 X --- X --- --- X C 69NT40-444-19 1210 549 12.3 5.6 X --- X --- --- X C 69NT40-444-20 1240 562 8.8 4.0 --- A --- --- X B --- 69NT40-444-21 1240 563 8.8 4.0 --- A --- --- X B --- 69NT40-444-22 1240 562 12.3 5.6 --- --- X --- X B --- 69NT40-444-23 1265 573 12.3 5.5 --- --- X --- X B C 69NT40-454-1 1166 529 12.0 5.4 --- X --- --- --- B --- 69NT40-454-2 1190 540 12.0 5.44 X X --- --- --- B --- 69NT40-454-3 1190 540 12.3 5.58 X X --- --- --- B ---

A --- Provision for water-cooled condenser. If the water-cooled condenser is added, the refrigerant charge will change. B --- The microprocessor (Rev 104 or greater software) includes code 32 for dehumidification, even though the

units do not have a humidistat. C --- Provision for heat exchanger. X --- Features that apply to model.

1-3

1

2

3

4

5

6

7

8

9 10 11 12 13 14

15

16

17

18

1. Access Panel (Evap. Fan Motor #2) 2. Access Panel (Heater Location) 3. TIR Locking Devices 4. Recording Thermometer (Optional) 5. Make-Up Air Cover 6. Condenser Fan Motor (CM) 7. Interrogator Connector 8. Power Cables and Plug 9. Serial/Model No. Plate Location

10. Discharge Service Valve 11. Compressor Sight Glass 12. High Pressure Switch (HPS) 13. Compressor Motor (CP) 14. Pressure Gauges (Optional) 15. Control Box 16. Fork Lift Pockets 17. Expansion Valve (Location) 18. Access Panel (Evap. Fan Motor #1)

Figure 1-1. Refrigeration Unit --- Front

1-4Revised 8-6-93

1. Evaporator Fan Motor #1 (EM1) 2. Humidistat (HCS) (Optional) 3. Return Air Temperature Sensor (RTS) 4. Chart Recording Thermometer Bulb 5. Return Recorder Sensor (RRS) 6. Defrost Termination Thermostat (DTT) 7. Evaporator Fan Motor #2 (EM2) 8. Evaporator Coil

9. Heater Termination Thermostat (HTT) 10. Evaporator Coil Heaters 11. Drain Pan Heater (DPH) 12. Dummy Receptacle 13. USDA Probe Receptacle (PR3) 14. USDA Probe Receptacle (PR1) 15. Interrogator Receptacle 16. USDA Probe Receptacle (PR2)

1 2 3 4 5 6 7

8910111213141516

Figure 1-2. Refrigeration Unit --- Rear (Panels Removed)

1-5

SIDE VIEW

UNITS WITH PROVISIONS FOR R-22

1. Compressor Discharge Sensor (CPDS If Used) 2. High Pressure Switch (HPS) 3. Compressor Suction Sensor (CPSS) 4. Solenoid Modulating Valve (SMV) 5. Suction Solenoid Valve (SSV) --- 69NT40 6. Condenser Saturation Sensor (CSAS If Used) 7. Ambient Sensor (AMBS) 8. Water Pressure Switch (WP) (Optional) 9. Water-Cooled Condenser/Receiver (Optional) 10. Sight Glass 11. Supply Air Temperature Sensor (STS)

12. Supply Recorder Sensor (SRS) (Optional) 13. Suction Service Valve 14. Filter-Drier 15. Pressure Relief Valve 16. Liquid Line and Charging Valve 17. Moisture-Liquid Indicator 18. Quench Valve (QV) --- Solenoid 19. Quench Valve --- Thermostatic Expansion 20. Nitrogen Feed (Optional) 21 Receiver (Optional)

UNITS WITH WATER-COOLED CONDENSER

UNITS WITH RECEIVER

1 3 4 5 6

7891011,12,2013

21 15 18,19

19 15

16

17

1814

2

Figure 1-3. Water-Cooled Condenser/Receiver Section

1-6Revised 8-6-93

In range

SETPOINT/Code

DataCORDER

Cool Heat Defrost Alarm

AIR TEMP/Data

1 2 3 4 5 6 7

8

9

10

18 17 16 15 13,14 12 11

20

1. Compressor Contactor (C) 2. Condenser Fan Motor Relay (CF) 3. Heat Relay (TH) 4. Evaporator Fan Motor Relay --- High Speed (EF) 5. Current Transformer (CT) 6. Terminal Block (TB) 7. Microprocessor Control Box 8. Remote Monitoring Receptacle (RM) (Optional) 9. Manual Defrost Switch (MDS) 10. Start-Stop Switch (ST) 11. Microprocessor Control Panel (Display)

12. Control Transformer (TR) 13. Control Fuse (F) (6 amp) 14. Fuse (F3A & F3B) (5 amp) Slow Blow 15. Voltage Switch (VS) (Optional) 16. Circuit Breaker (CB-1) --- 460V 17. Potential Transformer (PT) 18. Circuit Breaker (CB-2) --- 230V (Optional) 19. Evaporator Fan Motor Relay --- Low Speed (ES) 20. Battery Module Switch (BMS) --- Optional 20 Condenser Fan Switch (CFS) --- Optional

UNITS WITH TWO-SPEED EVAPORATOR MOTOR

UNITS WITH ONE-SPEED EVAPORATOR MOTOR

15

19

Figure 1-4. Control Box

1-7

1.2 GENERAL DESCRIPTION

a. Compressor Section NOTE

Check the compressor Serial/Model Number plate for CFM displacement, refer to Table 1-2.

The compressor section includes the compressor (with high pressure switch), power cable storage compartment, and an optional power transformer which is located to the left of the compressor.

This section also contains the modulating solenoid valve, suction solenoid valve (Model 69NT40 only), quench valve, moisture-liquid indicator, manual liquid line valve, filter-drier, pressure relief valves, compressor suction sensor (CPSS) and compressor discharge sensor (CPDS).

The supply air temperature sensor (STS), supply recorder sensor (SRS) and ambient sensor (AMBS) are located at the right side of the compressor.

Table 1-2 Compressor Model Number Significance Chart

06DR2379CC1970 1st, 2nd & 3rd DIGIT 06D Hermetic Reciprocal

4th DIGIT R Reefer

6th & 7th DIGIT VOLUME 28 28CFM 37 37CFM 41 41CFM

b. Condenser Section

The condensing section consists of a condenser fan motor, condenser fan, condenser saturation sensor (CSAS), and an air-cooled condenser coil.When the unit is operating with air-cooled condenser operation, air is pulled in the bottom of the coil and discharges horizontally through the center of the unit.

Some units are equipped with an optional water-cooled condenser (condenser/receiver) and a water pressure switch or condenser fan switch (CFS). (See Figure 1-3)

c. Evaporator Section

The evaporator section contains the temperature recorder bulb, return recorder sensor (RRS) and thermistor, return temperature sensors (RTS), thermostatic expansion valve, evaporator fanmotors and fans (2), evaporator coil and heaters, drain pan and heaters, defrost and heat termination switches. See Figure 1-2 and Figure 1-3 for sensor location.

The evaporator fans circulate air throughout the container by pulling air in the top of the refrigerationunit and directing the air through the evaporator coil where it is either heated or cooled, and then discharged out the bottom of the refrigeration unit into the container.

Some units are equipped with two-speed evaporator fan motors. Refer to Table 1-1. When transporting perishable commodities, the fan motors will be in high speed (above ---10_C = +14_F).

The evaporator coil heaters are accessible by removing the front, lower access panel. The defrost termination switch (DTT) is located on the coil center tube-sheet and may be serviced by removing the upper rear, panel or by removing the left front, upper access panel and reaching through the evaporator fan venturi AFTER POWER IS TURNED OFF AND POWER PLUG DISCONNECTED.

d. Control Box

The control box and door include the manual switches, circuit breaker(s), relays, transformers (potential and control) and fuses. (See Figure 1-4).

1.3 REFRIGERATION SYSTEM DATA

a. Compressor --- Motor Assembly

No. of Cylinders: 6 Model: 06DR Weight (Dry): 260 lb (118 kg)

b. Approved Compressor Oil

Petroleum Specialties Inc. --- Cryol 150 Witco --- Suniso 3GS Texaco --- Capella WF32

c. Compressor Oil Charge

4.0 liters (8.5 U.S. Pints)

d. Compressor Oil Sight Glass

Oil level should be between 1/4 to 1/2 of sight glass with the compressor in operation.

e. Defrost Timer

Initiates Defrost: Refer to section 1.13.4 (Code 25)

f. Defrost Termination Thermostat

Opens: 23.9 ( 3)_C = 75 ( 5)_F Closes: 15.6 ( 3)_C = 60 ( 5)_F

g. Expansion Valve Superheat

Settingat 0_C(32_F) containerbox temperature: 4.4 to 5.5_C (8 to 10_F)

h. Heater Termination Thermostat

Opens: 54 ( 3)_C = 130 ( 5)_F Closes: 38 ( 3)_C = 100 ( 5)_F

i. High Pressure Switch

28 or 37 CFM Compressor: Cutout: 21 ( 0.7) kg/cm@ = 295 ( 10) psig Cut-In: 13 ( 0.7) kg/cm@ = 190 ( 10) psig 41 CFM Compressor: Cutout: 25 ( 0.7) kg/cm@ = 350 ( 10) psig Cut-In: 18 ( 0.7) kg/cm@ = 250 ( 10) psig

j. Refrigeration Charge

Refer to Table 1-1.

1-8Revised 8-6-93

k. Pressure Relief Valves

Low Side: Opens: 18.63 kg/cm@ (265 psig)

High Side for R-12: Opens: 24 kg/cm@ (340 psig)

High Side with provision for R-22: Opens: 34.10 kg/cm@ (485 psig)

High Side on model 69NT40-441-25: Opens: 35.15 kg/cm@ (500 psig)

m. Unit Weight

Refer to Table 1-1.

n. Water Pressure Switch (Optional)

Cut-In: 0.5 0.2 kg/cm@ (7 3 psig) Cutout: 1.6 0.4 kg/cm@ (22 5 psig)

1.4 ELECTRICAL DATA

a. Circuit Breaker

CB-1 Trips at: 29 Amps (Model 69NT40) CB-1 Trips at: 24.2 Amps (Model 69NT20) CB-2 Trips at: 50 Amps

b. Compressor Motor

Full Load Amps (FLA): 17.6 Amps @ 460 vac (with current limiting set at 21 amps) (Model 69NT40)

c. Condenser Fan Motor

Bearing Lubrication: Factory lubricated, additional grease not required.

Full Load Amps: 2.0/4.0 FLA Nominal Horsepower: 0.43/0.75 hp Rotation: CCW when viewed from shaft end. Speed: 1425/1725 Voltage: 190/380/208/230/460 vac/1ph/50/60 hz

d. Drain Pan Heaters

Number of Heaters: 1 Rating: 750 watts +5 /---10 % at 460 Vac Resistance (cold): 22.7 5% ohms nominal Type: Sheath

e. Evaporator Coil Heaters

Number of Heaters: 4 Rating: 750 watts each at 230 +5/---10 volts Resistance (cold): @ 68_F (20_C) Ambient: 66.8 to 77.2 ohms Type: Sheath

f. Evaporator Fan Motor(s)

Bearing Lubrication: Factory lubricated, additional grease not required

Full Load Amps High Speed: 2.0/2.3 Amps Low Speed: 0.4/0.6 Amps Single Speed Motor: 2.0/4.0 Amps

Nominal Horsepower High Speed : 0.58/1 hp Low Speed : 0.07/0.12 hp Single Speed Motor : 0.58/1.0 hp

Rotation Evap. Fan Motor #1 (See Figure 1-2): CW when viewed from shaft end CCW when viewed from end opposite shaft end

Evap. Fan Motor #2 (See Figure 1-2): CCW when viewed from shaft end CW when viewed from end opposite shaft end

Speed: 2850/3450 rpm

Voltage: 380/460 vac/1 ph/50/60 hz

g. Fuses

Control Circuit: 6 Amps (F) Microprocessor: 5 Amps (Slow Blow) (F3A) Battery Charger: 5 Amps (Slow Blow) (F3B)

1.5 VOLTAGE SWITCH AND POWER TRANSFORMER (OPTIONAL)

WARNING

Do not attempt to remove power plug(s) before turning OFF start-stop switch (ST), unit circuit breaker(s) and external power source.

Make sure the power plugs are clean and dry before connecting to any power receptacle.

a. Step-Up Power Transformer

The transformer is located under the condenser coil (left-hand side of unit) and the purpose of this transformer is to provide 380 vac/3 ph/50 hz power when the 190/230 vac power cable (black) is connected to a 190 vac power supply or to provide 460 vac/3 ph/60 hz when the 190/230 vac power cable (black) is connected to a 230 vac power supply.

WARNING

Do not attempt to remove power plug before turning OFF voltage switch (VS), start-stop switch (ST), unit circuit breakers (CB-1 And CB-2), and external power source.

b. To Place Unit on 190/230 vac Power Supply

1. Make sure voltage switch (VS) is in the OFF position. Make sure start-stop switch (ST, on control panel) and circuit breakers CB-2 is in position 0 (OFF). (See Figure 1-4.)

2. Connect 190/230 vac power cable plug (black cable). Place voltage switch (VS) in the 230 v position. Place circuit breaker (CB-2) in position 1. Close and secure control box door and then place the start-stop switch (ST) in position 1.

c. To Place Unit on 380/460 vac Power Supply

1. Make sure voltage switch (VS) is in the OFF position. Make sure start-stop switch (ST, on control panel) and circuit breaker (CB-1) is in position 0. (OFF).

2. Connect 380/460 vac power cable plug (yellow cable). Place voltage switch (VS) in the 460 v position. Place circuit breaker (CB-1) in position 1. Close and secure control box door and then place the start-stop switch (ST) in position 1.

1-9

1.6 FRESH AIR MAKEUP VENT The purpose of the vent is to provide ventilation for

commodities that require fresh air circulation and must be closed when transporting frozen foods.

Air exchange depends on static pressure differential which will vary depending on the container and how the container is loaded. The chart below gives air exchange values for an empty container. Higher values can be expected for a fully loaded container.

0

30

60

90

120

150

180

210

240

0 10 20 30 40 50 60 70 80 90 100

AIR FLOW (CMH)

1-!/2

PERCENT OPEN

69NT40 FRESH AIR MAKEUP

T-BAR

2-%/8

3 T-BAR

T-BAR

ZERO EXTERNAL STATIC 50HZ

For 60HZ operation multiply curves by 1.2

a. Full Open or Closed Positions Maximum air flow is achieved by loosening the wing

nuts andmoving the cover to themaximumopen position (100% position). The closed position is 0% air flow position.

The operatormay also adjust the opening to increase or decrease the air flow volume to meet the required air flow. b. Air Sampling for Carbon Dioxide (CO2) Level

Loosen wing nuts and move cover until the arrow on the cover is aligned with the atmosphere sampling port label. Tighten wing nuts and attach a 3/8 tube to the sampling tube.

If the internal atmosphere content has reached an unacceptable level, the operator may adjust the cover opening tomeet the required air flow volume to ventilate the container. c. Reduced Flow for Fresh Air Makeup

On some models the air slide is supplied with two adjustable air control disks. The fresh air makeup can be adjusted for (15, 35, 50 or 75) cubic meters per hour (CMH).Theair flowhasbeen establishedat 60HZpower and 2 1/2 inch T bar and with 15mm (.6 inch) H2O external static above free blow.

Loosen the hex nut and adjust each disk to the required air flow and tighten hex nut.

NOTE The main air slide is in the fully closed position during reduced air flow operation.

NOTE Model 69NT40-454 has a special air makeup cover with a maximum air flow (100% open) of 80CMH (47CFM).

1-10Revised 8-6-93

Table 1-3. Safety and Protective Devices

UNSAFE CONDITIONS SAFETY DEVICES DEVICE SETTING

1. Excessive current draw 1. Circuit Breaker (CB-1) --- Manual Reset

1. Trips at 24 amps (460 vac 69NT20)

1. Trips at 29 amps (460 vac 69NT40)

1. Circuit Breaker (CB-2) --- Manual Reset

1. Trips at 50 amps (230 vac)

2. Excessive current draw on control circuit 2. Fuse (F) 2. Opens at 6 amps 3. Excessive condenser fan motor

winding temperature 3. Internal Protection (IP-CM) ---

Automatic Reset 3. N/A

4. Excessive compressor motor winding temperature

4. Internal Protector (IP-CP) --- Automatic Reset

4. N/A

5. Excessive evaporator fan motor(s) winding temperature

5. Internal Protector(s) (IP-EM) --- Automatic Reset

5. N/A

6. Abnormally low refrigerant temperature 6. Pressure Relief Valve --- Low Side

6. Opens at 18.63 kg/cm@ (265 psig)

7. Abnormally high refrigerant temperature 7. Pressure Relief Valve --- High Side

7. Refer to paragraph 1.3.k

8. Abnormally high discharge pressure 8. High Pressure Switch 8. Refer to paragraph 1.3.i 9. Solid state circuitry high voltage surge 9. Fuse (F3A) 9. Opens at 5 amps 10. Excessive power transformer winding

temperature 10. Internal Protector (IP-Trans) ---

Automatic Reset 10. Opens at 178 5_C

(350 10_F) Closes at 150 7_C (300 12_F)

1.7 SAFETY AND PROTECTIVE DEVICES System components are protected from damage by

safety and protective devices listed in Table 1-3. These devices monitor the system operating conditions and open a set of electrical contacts when an unsafe condition occurs.

Open safety switch contacts of one or more of the following devices IP-CM, IP-CP, HPS, or IP-Trans (Auto) will shut down the compressor and condenser fanmotor.

The entire refrigeration systemwill shut down if one of the following safety devices open: (a) Circuit Breaker(s) or; (b) Fuse (6A) or; (c) Evaporator Fan Motor Internal Protector(s) --- (IP-EM).

1.8 REFRIGERATION CIRCUIT

Starting at the compressor, the suction gas is compressed to a higher temperature and pressure.

When operating with the air-cooled condenser, the gas flows through the discharge service valve into the air-cooled condenser. Air flowing across the coil fins and tubes cools the gas to saturation temperature. By removing latent heat, the gas condenses to a hot liquid and then flows to the water-cooled condenser/receiver which stores the additional charge necessary for low temperature operation.

When operating with thewater-cooled condenser, the hot gas flows through the air-cooled condenser and into the water-cooled condenser. The heat flows from the hot gas into the condenser coolant thus cooling the compressed gas and changing the state of refrigerant from a gas to a liquid.

From the condenser/receiver, the liquid refrigerant flows by a pressure relief valve which opens if the refrigerant pressure is abnormally high.

The liquid refrigerant continues through a liquid line shutoff valve, filter-drier (which keeps refrigerant clean and dry), a moisture-liquid indicator and then to the thermostatic expansion valve. As the liquid refrigerant passes through the orifice of the expansion valve some of it vaporizes into a gas (flash gas). Heat is absorbed from the evaporator air by the balance of the liquid causing it to vaporize in the evaporator coil. The vapor then flows through the modulating solenoid valve to the compressor.

The thermostatic expansionvalve bulbon the suction line near the evaporator coil outlet, controls the valve, maintaining a relatively constant superheat at the coil outlet regardless of load conditions except at abnormally high container temperatures such as during pulldown (valve at maximum operating pressure condition).

1-11

1. Suction Service Valve 2. Discharge Service Valve 3. Air-Cooled Condenser 4. Water-Cooled Condenser or Receiver 5. Sight Glass 6. Water Outlet 7. Water Inlet 8. Pressure Relief Valve (High Side) 9. Pressure Relief Valve (Low Side) 10. Liquid Line Valve 11. Filter-Drier 12. Moisture-Liquid Indicator 13. Expansion Valve 14. External Equalizer Line 15. Expansion Valve Bulb 16. Evaporator 17. Suction Solenoid Valve (69NT40) 18. Modulating Solenoid Valve 19. Quench Valve (Solenoid or Thermostatic)

18

2

16

8

7 1

3

4

10

5 6

9

11

13

14

15

17

19

12

Figure 1-5. Refrigeration Circuit

1.9 WATER-COOLED CONDENSER (OPTIONAL)

The water-cooled condenser is used when cooling water is available and heating the surrounding air is objectionable, such as in a ships hold.

The water-cooled condenser is of the shell and coil type with circulating water through the cupro-nickel coil. The refrigerant vapor is admitted to the shell side and is condensed on the outer surface of the coil.

1.9.1 Water-Cooled Condenser with Water Pressure Switch

For operation of the refrigeration unit with the water-cooled condenser, do the following:

a. Connect water supply line to inlet side of condenser and discharge line to outlet side of condenser.

b. Maintain a flow rate of 11 to 26 liters per minute = 3 to 7 gallons per minute. The water pressure switch will open to de-energize the condenser fan relay. The con-

denser fan motor will stop and will remain stopped until the water pressure switch closes.

The refrigeration unit operating with the water-cooled condenser will perform as outlined in section 2.4 except that the condenser fan motor is stopped in all modes.

To shift to air-cooled condenser operation, do the following:

Disconnect thewater supply and thedischarge line to the water-cooled condenser. The refrigeration unit will shift to air-cooled condenser operation when the water pressure switch closes. (Refer to section 1.3.)

1.9.2 Water-Cooled Condenser with Condenser Fan Switch (CFS)

For operation of the refrigeration unit with the water-cooled condenser with (CFS), do the following:

a. Connect water supply line to inlet side of condenser and discharge line to outlet side of condenser.

b. Maintain a flow rate of 11 to 26 lpm (3 to 7 gpm).

c. Set CFS switch to position O when water is sup- plied to water-cooled condenser. This will de-ener- gize the condenser fan relay. The condenser fanmo- tor will stop and will remain stopped until the CFS switch is set to position 1.

The refrigeration unit operating with the water-cooled condenser andCFS switch in position O , will perform as outlined in section 2-4 except that the condenser fan motor is stopped in all modes.

WARNING

Whenwater flow isbelow 11 lpm (3gpm) orwhen water-cooled operation is not in use, the CFS switchmustbe set toposition 1 or the unitwill not operate properly.

To shift to air-cooled condenser operation, do the following:

Turn the unit off and set the CFS switch to position 1. Disconnect the water supply and the discharge line to the water-cooled condenser. The unit should now perform as outlined in section 2.4.

1.10 REMOTE MONITORING (OPTIONAL) NOTE

Models with an in-range light, the light will be illuminated if the container return air temperature is within the tolerance selected. Refer to section 1.13.4 (Code 29).

1.10.1 Remote Monitoring Plug

When the remote monitor is connected to the remote monitoring plug, the following remote circuits are energized.

Circuit Function

Sockets RMT3 to RMR1 Energizes remote in-range light

1-12Revised 8-6-93

1.10.2 Remote Monitoring Receptacle When the remote monitor is connected to the

remote monitoring receptacle, the following remote circuits are energized.

Circuit Function

Sockets B to A Energizes remote cool light Sockets C to A Energizes remote defrost light Sockets D to A Energizes remote in-range light

1.11 SUCTION SOLENOID VALVE (Model 69NT40)

The suction solenoid valve, shown in Figure 1-3 is controlled by the controller relay (TS).

a. Operation If set point is below ---10_C (+14_F), and the suction

solenoid valve override is not activated, controller relay (TS) closes to energize the suction solenoid valve (SSV). Once opened, the refrigerant flow rate and unit cooling capacity is increased.

If set point is above ---10_C (+14_F), and the suction solenoid valve (SSV) is not activated, suction solenoid valve opens during temperature pulldown period unless current limiting restricts its use. b. Suction Solenoid Override

This function restricts the opening of the suction solenoid valve (SSV) under certain ambient and box temperature conditions. If the primary return sensor (RTS) fails (AL56), the suction solenoid valve will not open unless the ambient temperature is less than 10_C (50_F). If the ambient sensor fails (AL58), the suction solenoid valve will not be allowed to open until the return air temperature is less than 1.67_C (35_F). If both the ambient and return air (RTS) sensors fail, the suction solenoid valve will not be allowed to open until at least one of the sensors is repaired.

1.12 FROST FORMATION ON COMPRESSOR NOTE

Some Models have a thermostatic expansion quench valve, so frost formation on compressor is NOT APPLICABLE. To see which Models have a solenoid quench valve refer to Section 5.

Frost may, in normal operation, form on the compressor suction service valve and end bell. This is caused by normal quench solenoid valve operation in conjunction with the suction modulation valve. Figure 1-6A shows the allowable frost limit pattern for units operating with the controller set point above ---10_C (+14_F). This frost pattern is described below.

The temperature controller varies the amount of current to the suctionmodulation valve coil (SMV)which in turn increases or decreases the amount of restriction in the suction line, so that the net cooling capacity of the unit will match the cooling required to maintain the load at set point.

When the suctionmodulation valve is approximately 40% closed (approximately 0.6 amps output to the

suction modulation valve coil from the temperature controller), the temperature controller will energize the quench solenoid valve.When the quenchvalve is opened, a small amount of liquid refrigerant is metered through an orifice (which acts as an expansion device) into the suction linedown streamof the suctionmodulation valve. Because of low compressor suction pressures created by the suction modulation valve, the liquid fed by the quench valve flashes to a low temperature gas and, therefore, the compressor may form frost or ice on the end bell and top of the motor cavity adjacent to the suction gas path of flow. This is not harmful to the compressor, as the restrictor in the quench valve line prevents excessive liquid from flowing into the compressor.

With the controller set below ---10_C (+14_F) the allowable compressor frost pattern limit is shown in Figure 1-6B. The frost line will not normally extend beyond the suction service valve as the quench valve will not energize when operating with the controller set point below ---10_C (+14_F).

If excessive frost is noticed on the compressor and the suction modulation system is operating normally, then the thermal expansion valve superheat setting should be checked. Flooding by a thermal expansion valve may cause oil to foam excessively. Normal quench valve operation will not foam the oil significantly.

Adhesive-backed labels depicting allowable frost patterns on compressors are available from Carrier Transicold Replacement Component Group.

Figure A Controller Set Above ---10_C (+14_F)

Figure B Controller Set Below ---10_C (+14_F)

Figure 1-6. Frost Pattern on Compressors

1-13

1.13 COMPUTER CONTROL --- ELECTRONICS CENTER

Enter

Hours Since Last Trip Start

Trip Start

Return

Supply

C

F

Figure 1-7. Microprocessor Control Panel

1.13.1 Brief Description NOTE

For manual override operation of the microprocessor, refer to Table 4-7.

CAUTION When doing any arc welding on the unit or container, disconnect all connectors from controller and remove ground lead going to I/O board to prevent any damagedue to electrostatic discharge. The Carrier Transicold Computer Control ---

Electronics Center (CC-EC) is a custom-designed computer which incorporates electronic intelligence to:

a. Control temperature of supply or return air to ex- tremely tight limits by providing modulation refrigera- tion control and electric heat control and defrost to en- sure continuous conditioned air delivery to the load.

b. Provide dual independent readouts of set point and supply or return air temperatures and, in addition, the following data:

--- Ambient Air Temperature --- DataCORDER Probe Temperatures (Optional) --- Refrigeration Valve Positions (open, close or % open)

--- Power Supply Voltage, Frequency and LineCurrents

--- Refrigerant Suction, Discharge, Condenser Temper- atures

--- Refrigerant Discharge Pressure

--- Compressor Running Hours

--- Time Remaining Until Defrost

c. Provide digital readout and ability to select the fol- lowing data:

--- Defrost Interval

--- _C or _F

--- In-Range Tolerance

--- Time Delay Start Interval --- Start of Unit

--- Current Limiting

d. Signal malfunction alarm light and/or digital display identification of the following:

--- Internal or Fuse Protection of Control Circuit, Transformer, Compressor, Evaporator and Condenser Motor

--- High Pressure Cut-Out

--- Individual Sensor Failure

--- High Temperature Thermostat

--- Failure of Heaters, Defrost Termination Thermo- stat, and Compressor

--- Self-Diagnostic Conditions of Computer Functions

e. Provide a detailed automatic pre-trip step-by-step checkout of refrigeration unit performance, proper com- ponent operation, proper electronic and refrigeration control operation, proper heater operation, checking probe calibration and current limiting.

f. Provide storage of detailed temperature information on set point and return and supply air, record of power outage, defrost initiation, set point changes, alarmoccur- rences and date of trip start.

1-14Revised 8-6-93

This data is recorded for aminimumof 1500 hours of unit operation (the equivalent of 62 days continuous running operation or approximately 120 calendar days of average container utilization) and can be printed out for each hour interval. A backup battery saves data in the DataCORDER during periods of unpowered service.

For USDA recording requirements a (optional) backup battery for data recording during periods of unpowered service (for up to 8 days), and receptacle for three remote mounted PT100 resistance temperature detector (RTD) probes are available.

g. Provide a convenient environmentally protected portable computer which can be easily carried from unit to unit to interrogate each unit during or at the end of each trip and then is capable of either directly printing this data out in short or long form reports or transfer the data into a PC computer for long-term storage on floppy or hard disk storage. The data can be displayed in tabular form.

The interrogatorwill not erase the data from the unit DataCORDER memory. After 1500 hours of data recording, the older data will be overwritten by the latest reading.(Refer to section 1.13.5 TP00 & TP01)

h. Provide a two-way communication link to transmit operational and stored unit data to a remote computer communication center and the ability to allow remote control of refrigeration unit operation, pre-trip initia- tion, defrost initiation, set point change, defrost interval _Cor _F, in-range tolerance, time delay start interval and current limiting.

i. For software revision number 106 or greater, provide the ability to select or change Codes 26 to 32 without AC power being hooked up. (Refer to section 1.13.9)

1.13.2 General Layout of Control Center

The entire ComputerControl --- ElectronicCenter is housed in one control box consisting of a control panel which has the annunciator board and display board attached behind it. The relay board and logic board are secured above the control panel. Locking push-on connectors are used to attach the wiring of the unit to the logic and relay boards. Gold-plated terminals are used to ensure reliable electrical connections and eliminate corrosion. Themicroprocessor control box is designed to permit ease of installation and removal and allows rapid replacement of the microprocessor on-board the ship. This permits analysis and repair of the control center at more convenient repair areas aboard ship or elsewhere.

All control functions are accessed or viewed through a display panel designed for optimum user friendliness and convenience.

The display panel is mounted at a 15-degree downward tilt to aid in visibility when stacked in close quarters and consists of:

a. Twelve (12) push energized membrane switches (keypad) are dedicated to the following functions:

Key Function

Arrow Up Change set point upward. Change codes upward. Scan alarm list upward. Change user selectable features upward. Pre-trip advance forward.

Arrow Down Change set point downward. Change codes downward. Scan alarm list downward. Change user selectable features downward. Pre-trip repeat backward.

Return/Supply Displays non-controlling probe temperature (momentary dis- play).

_C/_F Displays alternate units temperature scale (momentary display).

Alarm Reset Clears alarm light and alarm memory (when followed by En- ter key).

Code Select Access function codes (see ar- row up and arrow down).

Defrost Interval Displays selected defrost inter- val.

Pre-Trip Initiate pre-trip inspection (when followed by Enter key). Discontinues pre-trip in prog- ress.

Manual Defrost Initiates a defrost cycle when pressed. (In addition, a sepa- rate toggle switch on the elec- tric control box door is pro- vided.)

Enter Entering a set point change. Extending to 30 seconds the time a chosen function code is displayed. Entering a code se- lect mode to interrogate the alarm list. Entering the value of a user selectable mode. Clear- ing the alarm list and initiating pre-trip.

b. Two (2) large LCDs (19mm/0.748 inch --- high) which are easily viewed in direct sunlight and backlighted for superior nighttime visibility.

c. Five (5) Mode Indicator Lights --- Cool --- Heat --- Defrost --- In-Range --- Alarm

d. Two (2) (Yellow) --- high intensity light emitting diodes (LED) for return or supply air probe display indication.

1-15

DataCORDER Key Display (Optional)

Hours Since Last Hours since last trip start. Trip Start

Trip Start Initiates Trip Start (when pressed simultaneously with hours since last trip start).

1.13.3 Microprocessor Temperature Control

There are two control ranges Frozen and Perishable. The Frozen range is active with set points at or below ---10_C (+14_F) and the Perishable range is active at set points above ---10_C (+14_F). See Figure 1-9 and Figure 1-10.

a. Perishable range above ---10_C (+14_F).

For set points above ---10_C (+14_F), the controller will maintain supply air at the set temperature by the following modes of operation:

1. Conventional, Dehumidification Control (Code 32 OFF) --- cooling by refrigeration with suction modulation and the compressor cycling at light loads. Electric resistance heating.

2. Conventional plus Dehumidification, Humidity Control (Code 32 ON) --- cooling by refrigeration with suction modulation and compressor cycling at low humidities, suction modulation and simultaneous electric resistance heating at high humidities.

1. Operation in the Conventional Mode (Code 32 OFF)

The supply probe is used for control and is so indicated by the LED on the display board. The Perishable temperature range demands high accuracy. The system is capable of maintaining supply air temperature towithin+0.25_C (+0.5_F) of the set point temperature setting. The compressor is energized continuously to ensure a steady and stable supply air temperature to the container. In Perishable range above ---10_C (+14_F) control is maintained by controlling the positions of the solenoid modulation valve (SMV) and suction solenoid valve (SSV, on 69NT40 only).

When pulling down to set point, both valves will be open to reduce the pulldown time unless suction solenoid override is activated. See section 1.11 for explanation of suction solenoid override. The current limit functionwill override if the current is above the selected value, and restrict the valves. When the temperature reaches set point, the suction solenoid valve will close.

As the temperature enters the in-range temperature tolerance, the in-range light will energize.

The controller logic is designed so the solenoid modulating valve will begin to close as set point is reached. The modulation valve will close to restrict refrigerant flowuntil the capacity of the unit and the load are balanced.

If the temperature drops below set point, the compressorwill remain running for a fewminutes. This is to accommodate any initial overshoot whichmight occur.

After this time and at 0.2_C (0.4_F) or greater below set point, the compressor will be turned OFF.

The heaters will be energized if the temperature drops to 0.5_C (0.9_F) below set point. The heaters will de-energize when the temperature rise to 0.2_C (0.4_F) below set point. The compressor will not restart until the temperature rise to 0.2_C (0.4_F) above set point, and the 6 minute time delay has been satisfied.

2. Operation in the Dehumidification Mode (Code 32 ON) --- Optional

The dehumidification mode is activated by selecting Code 32 and pressing theEnter key to display ON. The control probe LED (supply 1) will flash ON and OFF every second to indicate the dehumidification mode is active. Once the Mode is active and the following conditions are satisfied, the controller will activate the heat relay to begin dehumidification.

1. The humidistat is calling for dehumidification. (ie., HCS is closed and 24 vac is at plug Pd23.)

2. The pulldown mode is NOT active. (ie., The bypass valve is closed.)

3. The control probe (ie., Supply 1) temperature is less than or equal to setpoint +.25_C.

4. The system is in the control mode and the compressor is running.

This applies power to the defrost and drain pan heaters. This added heat load causes the controller to open the modulating valve to match the new total heat load while still holding the supply air temperature very close to set point.

Opening the modulating valve reduces the temperature of the evaporator coil surface which increases the rate water is condensed from the air passing through the coil. Removing water from the air reduces the relative humidity until the HC setting is reached and controller de-energizes the heat relay.

Humidity controller HC will continue to cycle heating to maintain relative humidity below HC setting.

Two timers are provided in the Dehumidification mode to prevent rapid mode switching and consequent contactor wear. They are:

1. Heater debounce timer (3 minutes).

2. Out-of-range timer (5 minutes).

Theheater debounce timer is activatedwhenever the contactor status is changed. The contactor remains energized (or de-energized) for at least 3 minutes even if the humidistat switch (HCS) opens (or closes). This is to prevent rapid cycling of the heat contactor when the humidistat approaches setpoint. If the mode is terminated by a condition other than the humidistat switch (HCS). For example, an out-of-range conditionor compressor shutdown, the heat relay is de-energized immediately.

The out-of-range timer is provided to allow the heaters to remain energized during a temporary out-of-range condition. If the control probe remains out-of-range for more than 5minutes, the heaters will be

1-16Revised 8-6-93

de-energized to allow the system to recover. The out-of-range timer starts as soon as the temperature exceeds the in-range tolerance value set by code Cd29.

Cooling capacity reduction by modulation is the same as described for the conventional operating mode when any of the above 4 conditions are invalid.

With set points below ---10_C (+14_F), operation is the same as previously described for conventional mode --- heating and dehumidification are locked out.

b. Frozen range below ---10_C (+14_F)

The return air probe is used for control and is so indicated by the LED on the display board.

The Frozen temperature range is not sensitive to minor temperature changes. Themethod of temperature control employed in this range takes advantage of this fact, to greatly improve the energy efficiency of the system. Temperature control in the Frozen range below ---10_C (+14_F) is accomplished by cycling the compressor on and off as the load demand requires.

If the return air temperature in the container drops 0.2_C (0.4_F) below the set point temperature, the compressor is cycled off. When the temperature is greater than 0.2_C (0.4_F) above set point and 6 minute time delay has beenmet, the compressorwill restart. The system will always operate at full capacity which means both the solenoid modulating (SMV) and suction solenoid (SSV) valves are fully open unless suction solenoid override is activated. See section 1.11 for explanation of suction solenoid override.

The temperature control is still within the tight limits. Conditions could exist, however, which may cause the return air temperature to rise rapidly. Such a case would be the initial reaching of set point temperature. When the set point temperature is initially reached, the load may still be warmer than the set point temperature. This could cause a rapid rise in return air temperature when the compressor is off, causing a rapid restart or on/off cycling of the compressor which is undesirable. To prevent this from occurring, a 6 minute compressor off time must be satisfied before the compressor will restart. Under a condition of a rapidly changing return air temperature, the time delay may allow the return air temperature to rise slightly more than 0.2_C (0.4_F) above the set point temperature before the compressor can restart.

1.13.4 Function and Data Codes

There are 30 functions which the operator may access to examine the operating status of the unit. To access these functions, perform the following: Press the code select key, press an arrow key until the left window displays the desired code number (see Table 1-4). The right window will display the value of this item for 5 seconds before returning to the normal displaymode. If a longer time is desired, pressing the Enter key will extend the time to 30 seconds after the last pressing of the Enter key. Below is an explanation of all Function codes.

Table 1-4. Function Code Assignments

FUNCTION CODE DATA

Display Only Functions Cd00 Alarm List Cd01 Suction Modulation Valve Opening (%) DCd02 Quench Valve (Open --- Closed) Cd03 Suction Solenoid Valve (Open --- Closed) Cd04 Line Current, Phase A Cd05 Line Current, Phase B Cd06 Line Current, Phase C Cd07 Supply Voltage Cd08 Supply Frequency Cd09 Ambient Air Temperature Cd10 Compressor Suction Temperature DCd11 Compressor Discharge Temperature DCd12 Saturated Condenser Temperature DCd13 Compressor Discharge Pressure Cd14 Future Expansion Cd15 Future Expansion Cd16 Compressor Motor Hour Meter DCd17 Hours Since Last Trip Start Cd18 Software Revision Number DCd19 Serial # (First 4 of 8) DCd20 Serial # (Second 4 of 8) DCd21 USDA #1 Probe Temperature DCd22 USDA #2 Probe Temperature DCd23 Secondary Return Air Temperature

(USDA) Cd24 Secondary Supply Air Temperature Cd25 Time Remaining Until Defrost

Display/Select Functions Cd26 Defrost Interval Cd27 Temperature Units (_C or _F) Cd28 Failure Action Cd29 In-Range Tolerance Cd30 Stagger Start Offset Time Cd31 Current Limit Cd32 Dehumidification Control (Optional)

D = Codes that are NOT APPLICABLE for some units

Code 00 --- Alarm List Display Selection (See Table 1-3 and Table 1-4)

This process will allow the user to examine all alarms that are written in the list. To notify the user of the top of the list, Strt is displayed. By using the arrow keys, the entire list may be displayed. Each alarm number will be preceded by a status indication, IA for inactive alarm and AA for active alarm. See Alarm section. Code 01 --- Suction Modulation Valve Opening (%)

The suction modulation valve (SMV) is a normally open valve which restricts flow of refrigerant to the compressor when energized by a pulse width modulated (PWM) output. The amount of closing of the valve is proportional to the applied current over the range of 0.2

1-17

to 1.3 Amps. The valve remains 100% open below 0.2 A and is 0% open at 1.3 A.

Code 02 --- Quench Valve (Open or Closed) NOTE

Some Models have a thermostatic expansion quench valve, so Code 02 is NOT APPLICABLE. To see which Models have a solenoid quench valve refer to Section 5.

Modulating controllers shall also operate a Quench solenoid valve (QV) to supply a minimum flow of refrigerant to the compressor suction inlet to assure the required motor cooling and maintain the compressor discharge temperature below a maximum value.

The quench valve is opened whenever the suction solenoid valve is closed and the suction modulation valve is less than 40% open. If the suction modulation valve is more than 60% open or the suction solenoid valve is open, the quench valve is closed.

Code 03 --- Suction Solenoid Valve (Open or Closed)

Model (69NT40) will have a suction solenoid valve (SSV) to provide maximum refrigerant flow to the refrigeration system. This valve will always be open for set points below ---10_C (+14_F) and during temperature pulldown periods unless current limiting restricts its use.

Codes 04, 05 & 06 --- Line Current, Phase A, B & C

The container is supplied by a three-phase electrical system, so there are three current sensors in the system. The current draw is used for control and diagnostic purposes.

For control processing, the largest of the three current values is used for current limiting purposes.

For diagnostic processing, the current draws areused to determine control unit operations.Whenever a heater or a motor is turned ON or OFF, the current draw increase/reduction for that activity is measured for all three legs of the system. Each current draw is then tested to determine if it falls within the expected range of values for the respective unit. Failure of this test will result in a pre-trip failure or a control alarm indication.

Code 07 --- Supply Voltage

The supply voltage will be a nominal 230 vac or 460 vac level, and will determine which set of current draw values to use for testing. The voltage is constantly monitored and a voltage level --- lower than 20% of its proper voltage will result in LO being alternately displayed with the set point.

Code 08 --- Supply Frequency

The value of the main power frequency is displayed in Hertz.

Code 09 --- Ambient Air Temperature

The ambient sensor (AMBS) measures the temperature outside the container. It is a factor in determining which speed the condenser fans will use (optional), and it is also used as a diagnostic factor for determining the system load. For locations of sensor, see Figure 1-3.

Code 10 --- Compressor Suction Temperature

Measured just prior to the compressor suction service valve, the compressor suction temperature is used for pre-trip diagnostics as an indicator of proper quench operation. For location of compressor suction sensor (CPSS), see Figure 1-3.

Code 11 --- Compressor Discharge Temperature (not applicable for some units)

The compressor discharge temperature is measured near the compressor discharge valve. For location of compressor discharge sensor (CPDS), see Figure 1-3.

Code 12 --- Saturated Condenser Temperature (not applicable for some units)

The saturated condenser temperature is measured on a condenser return bend. It is also used to calculate discharge pressure. For location of condenser saturation sensor (CSAS), see Figure 1-3.

Code 13 --- Compressor Discharge Pressure (not applicable for some units)

Calculated from the saturated condenser temperature.

Pressure is displayed in units of psig when code 27 is set to _F and units of bars when code 27 is set to _C. P appears after the value to indicate psig and b appears after the value to indicate bars.

Code 14 & 15 --- Future Expansion

These codes are for future expansion.

Code 16 --- Compressor Motor Hour Meter

Records total hours of compressor run time. For software revision number 106 or greater, records total hours in increments of (10) ten hours (ie. 3000 hours displayed as 300).

Code 17 --- Hours Since Last Trip Start (not applicable for some units)

This is the total number of hours since the last trip start. Up to 62 days can be recorded. A back-up battery keeps the clock running when power is disconnected.

Code 18 --- Software Revision Number

The software revision number is displayed.

Code 19 --- Serial # (First 4 of 8) (not applicable for some units)

The first 4 digits of the Serial number for the Microprocessor are displayed.

Code 20 --- Serial # (Second 4 of 8) (not applicable for some units)

The last 4 digits of the Serial number for the Microprocessor are displayed.

Code 21 --- USDA #1 Probe Temperature (not applicable for some units)

Displays the temperature of the #1 remote cold treatment probe.

Code 22 --- USDA #2 Probe Temperature (not applicable for some units)

Displays the temperature of the #2 remote cold treatment probe.

1-18Revised 8-6-93

Code 23 --- Secondary Return Air Temperature (not applicable for some units)

The secondary return air temperature (for four-probe systems) is measured at the same place as the primary return air temperature.

Code 24 --- Secondary Supply Air Temperature

The secondary supply air temperature (for four-probe systems) is measured at the same place as the primary supply air temperature.

Code 25 --- Time Remaining Until Defrost

This code displays the time remaining until the unit goes into defrost (in hours).

NOTE

The following are user-selectable functions. The operator can change the value of these functions to meet the operational needs of the container.

Code 26 --- Defrost Interval (Software Revision 108 or lower, 402, 304)

The defrost interval is the time interval between defrost cycles of which there are four possible selectable values: 3, 6, 12 or 24 hours. The factory default value is 3 hours. During pulldown, the interval is automatically set at 2.5 hours.

The time interval of the first defrost will not begin counting down until DTT is closed. At the time DTT closes, or at power-up if DTT is already closed, the time interval to the first defrost cycle is entered into the microprocessor.

When the interval timer has counted down 2.5 hr, the in-range status of the unit is checked. If out-of-range, the unit immediately goes into the defrost mode. Upon termination of defrost, the user selected interval (ie., 3, 6, 12& 24 hr) is reset. During pulldown fromhigh ambient, this cycle will repeat until the unit is in-range after 2.5 hours of timer countdown. At such time, the selected defrost interval time will be completed.

If the unit drifts out-of-range after the 2.5 hours of countdown but prior to completion of the selected interval, the unit will immediately go into defrost. Upon termination of defrost, the selected interval will be reset.

If DTT opens at any time during the timer count down, the interval is reset and the countdown begins over.

If DTT has failed open (ie., AL61 is active) and the primary return sensor temperature is less than 10_C, the interval timer countdown begins. The interval timer is reset if the return air temperature rises above 24_C. (See section 2.4.3.)

Code 26 --- Defrost Interval (Software Revision 110, 502, 503)

The defrost interval is the time interval between defrost cycles of which there are four possible selectable values: 3, 6, 12 or 24 hours. The factory default value is 3 hours. During pulldown, the interval is automatically set at 2.5 hours.

The time interval of the first defrost will not begin counting down until DTT is closed. At the time DTT

closes, or at power-up if DTT is already closed, the time interval to the first defrost cycle is entered into the microprocessor.

When the interval timer has counted down 2.5 hr, the in-range status of the unit is checked. If out-of-range and the control temperature is greater than 5_C above set point, the unit immediately goes into the defrost mode. Upon termination of defrost, the user selected interval (ie., 3, 6, 12& 24 hr) is reset. During pulldown fromhigh ambient, this cycle will repeat until the control temperture is less than or equal to the (set point temperature +5_C). At such time, the selected defrost interval time will be completed.

If the unit drifts out-of-range and the control temperature is greater than 5_Cabove set point, after the 2.5 hours of countdown but prior to completion of the selected interval, the unit will immediately go into defrost. Upon termination of defrost, the selected interval will be reset.

If DTT opens at any time during the timer count down, the interval is reset and the countdown begins over.

If DTT has failed open (ie., AL61 is active) and the primary return sensor temperature is less than 10_C, the interval timer countdown begins. The interval timer is reset if the return air temperature rises above 24_C. (See section 2.4.3.) Code 27 --- Temperature Units (_C or _F)

This code determines the temperature units _C or _F which will be used for all temperature displays. The user selects _Cor _Fby selecting code 27 and pushing the Enter key. The factory default value is _C. Code 28 --- Failure Action

If after 15 minutes of running, all four of the control sensors are out of range, the system will enter the shutdown state defined by the failure action. The user selects one of four possible actions as designated by a selection code:

A --- Full Cooling (SMV 100%) B --- Partial Cooling (SMV 50% open) C --- Evaporator Fan Only D --- Full System Shutdown --- Factory Default

Code 29 --- In-Range Tolerance The in-range tolerancewill determine thebandwidth

of temperatures around the set point which will be designated as in-range. If the control temperature is in-range, the in-range light will be illuminated. There are four possible values.

1. 0.5_C ( 0.9_F) 2. 1.0_C ( 1.8_F) 3. 1.5_C ( 2.7_F) 4. 2.0_C ( 3.6_F)

Code 30 --- Stagger Start Offset Time The stagger start offset time is the amount of time

that the system will delay at start-up, thus allowing multiple units to stagger their control initiation when all units are powered up together. The eight possible offset values are in (seconds):

0 = Factory Default (3, 6, 9, 12, 15, 18, 21)

1-19

Code 31 --- Current Limit

The current limit is the maximum current demand allowed on any phase at any time. Limiting the units current (amperage) reduces the load on the mains power and lowers the compressor discharge pressure. Whenever this is desirable, the limit can be lowered. Note, however, that capacity is also reduced. The five values are:

21 = Factory Default (15, 17, 19, 23) Code 32 --- Dehumidification Control

This code activates the dehumidification control mode of the system. Press the Enter key to toggle the mode between ON and OFF. When the code is set to ON, the control probe LEDwill flashON andOFF every second to indicate the mode is active. Code 32 is only applicable to units with a humidistat. 1.13.5 Alarms

The alarm philosophy balances the protection of the refrigeration unit and that of the refrigerated cargo. The action taken when an error is detected always considers the survival of the cargo. Rechecks are made to confirm an error actually exists. Some alarms requiring compressor shutdown have time delays before and after to try to keep the compressor on line. An example is a low main voltage. When the voltage drops over 20%, an indication is given on the display, but the unit will continue to run.

If a detectable problem is found to exist, the red alarm light will illuminate and its alarm code will be alternately displayedwith the set point on the left display. For software revision number 106 or greater, the red alarm light will illuminate for 20 series alarms only.

To determine if other alarms exist or have existed, the alarm list must be accessed. The alarm list will store up to eleven alarms in the sequence in which they occurred. When accessing the alarm list, an IA or an AA will appear to the left of the alarm code number. The IA indicates an inactive alarm; one that has occurred, but no longer exists. The AA indicates an active alarm; one that is still indicating an improper condition.

The codes in memory are displayed by pressing the code select key and then an arrow key until Code 00 is displayed in the left window. Strt will be displayed in the right window. Press the Enter key to enter this code. Now press the up arrow key and the alarm codes will be displayed on the right window in the sequence they occurred.

To extinguish the alarm light, and in so doing remove all alarms from the alarm list memory, press the alarm reset key and within five seconds the Enter key. If an active alarm has been corrected, the microprocessor may not detect this until the unit has been turned OFF and ON. The OFF and ON action will cause a retest of all components.

Alarms TP00 and TP01 can only be cleared by first trip starting the unit (simultaneously pressing the trip start key and hours since trip start key) and then pressing the alarm reset and Enter keys.

The controllermust be in the NormalDisplayMode. (ie., Set point and control Probe Display) and all alarms must be inactive to clear the alarm light and queue. Alarm 20 --- Control Circuit Fuse

Alarm 20 is triggered by the control circuit fuse opening and will cause the software shutdown of all control units. This alarm will remain active until the 6-amp fuse is replaced. Alarm 21 --- Evaporator Fan Motor

Alarm 21 is triggered by the opening of the evaporator motor internal protector. This alarm will disable all control units until the motor protector resets. Alarm 22 --- Auto Transformer

Alarm 22 is triggered by the auto transformer internal protectoropening, andwill result in thedisabling of all control units except the evaporator fans. The alarm will stay active until the transformer protector resets. Alarm 23 --- Compressor Motor

Alarm 23 is triggered by the opening of the compressor motor internal protector. This alarm will disable all control units except for the evaporator fans and will remain active until the motor protector resets.

Table 1-5. Alarm Indications

ALARM NO. ALARM DESCRIPTION

AL20 Control Circuit Fuse Open AL21 Evaporator Fan Motor Internal Protector AL22 Auto Transformer Internal Protector AL23 Compressor Motor Internal Protector AL24 Condenser Fan Motor Internal Protector AL25 Compressor High Pressure Limit Safety AL26 All Supply and Return Air Sensor Failure AL27 Probe Circuit Calibration Failure AL51 Alarm List Failure AL52 Alarm List Full AL53 Main Voltage Sensor Failure AL54 Primary Supply Air Sensor Failure AL55 Secondary Supply Air Sensor Failure AL56 Primary Return Air Sensor Failure DAL57 Secondary Return Air Sensor Failure AL58 Ambient Temperature Sensor Failure AL59 Heat Termination Thermostat

Failure AL60 Defrost Termination Thermostat Failure

(Closed) AL61 Defrost Termination Thermostat Failure

(Open) AL62 Heaters Failure AL63 Compressor Motor Failure DAL64 DataCORDER Low Battery AL65 Current Over Limit DTP00 Approaching DataCORDER Memory

Overwrite DTP01 DataCORDER Overwriting Data ERR # Internal Microprocessor Failure LO Low Main Voltage (More than 20%)

D = Alarms that are NOT APPLICABLE for some units

1-20Revised 8-6-93

Alarm 24 --- Condenser Fan Motor

Alarm 24 is triggered by the opening of the condenser motor internal protector and will disable all control units except for the evaporator fans. This alarm will remain active until the motor protector resets. This alarm is deactivated if the unit is operating on water cooled condensers.

Alarm 25 --- Compressor High Pressure

Alarm 25 is triggered when the compressor high discharge pressure safety switch remains open for at least one minute. This alarm will remain active until the pressure switch resets, at which time the compressor will restart.

Alarm 26 --- All Sensors Failure

Alarm 26 is triggered by a reading that all of the control sensors are out-of-range. This can occur for box temperatures outside the range of ---40_C (---40_F) to +55_C (+131_F) or in the unlikely event that two (four in DataCORDER unit) probes are bad. This alarm is masked for 15 minutes to give the unit time to bring the box within range. If the problem is that the unit is out-of-range, the DTT is used to determine if the high or low limit is being exceeded. If still out-of-range after 15 minutes, the probes are considered in error and the alarm is triggered.

This alarm triggers the failure action code set by Code Cd28.

Alarm 27 --- Probe Circuit Calibration Failure

Every second, the probe circuit current source is checked for proper calibration. If after three consecutive seconds, the current source cannot be brought into calibration, Alarm 27 is triggered.

The controller continues to try to calibrate. The alarm will remain active until successful calibration is achieved.

Alarm 51 --- List Failures

During start-up diagnostics, the alarm list is examined to determine validity of its contents. This is done by testing the set point and the alarm list. If the contents are invalid, Alarm 51 is set.

During control processing, any operation involving alarm list activity that results in an error will cause Alarm 51 to be set.

Alarm 51 is a display only alarm and is not written into the alarm list. Pressing the alarm reset key will result in an attempt to clear the alarm list. If that action is successful (all alarms are inactive), Alarm51will be reset.

Alarm 52 --- List Full

Alarm 52 is set whenever the alarm list is determined to be full; at start-up or after recording an alarm in the list.Alarm52 is displayed, but is not recorded in the alarm list.

This alarmcanbe reset by clearing the alarm list. This can be done only if all alarms written in the list are inactive.

Alarm 53 --- Main Voltage Sensor Failure Alarm 53 is caused by a line voltage reading of less

than 30V. It is a display alarm with no associated failure action. While Alarm 53 is active, no range testing will be doneof the line voltage and, for current test purposes, the voltage will be assumed to be 460 vac. Alarm 53 will be reset by any voltage reading greater than 30V. Alarm 54 --- Primary Supply Air Sensor

Alarm 54 is set by an invalid primary supply sensor reading outside the range of ---38 to+54_C. This alarm is ignored during the first 15 minutes of operation. See Alarm 26.

If Alarm 54 is set and the primary supply is the control sensor, the secondary supply sensor will be used for control.

Alarm 55 --- Secondary Supply Air Sensor Alarm 55 is set by an invalid secondary supply sensor

reading outside the range of ---38 to+54_C. This alarm is ignored during the first 15 minutes of operation. See Alarm 26.

If Alarm 55 is set and the secondary supply is the control sensor, the the primary return sensor will be used for control. Alarm 56 --- Primary Return Air Sensor

Alarm 56 is set by an invalid primary return sensor reading outside the range of ---38 to+54_C. This alarm is ignored during the first few minutes of operation. See Alarm 26.

If Alarm 56 is set and the primary return is the control sensor, the primary supply sensor will be used for control. Alarm 57 --- Secondary Return Air Sensor

(not applicable for some units) Alarm 57 is set by an invalid secondary return sensor

reading outside the range of ---38 to+54_C. This alarm is ignored during the first 15 minutes of operation. See Alarm 26.

This sensor is only used for data logging and has no backup. Alarm 58 --- Ambient Temperature Sensor

Alarm 58 is triggered by an ambient temperature outside the valid range from ---50_C (---58_F) to +70_C (+158_F). This is a display alarm and has no associated failure action. Alarm 59 --- Heat Termination Thermostat (HTT)

Alarm 59 is triggered by the opening of the heat termination thermostat and will result in the disabling of the heater. This alarm will remain active until the thermostat resets. Alarm 60 --- Defrost Termination Thermostat (DTT)

Closed Failure Alarm 60 is an indication of a probable failure

(closed) of the defrost termination thermostat (DTT). It is triggered by the opening of the heat termination thermostat (HTT) or the failure of the DTT to open (within 1.0 to 1.5 hours depending on voltage) during defrost.

1-21

Alarm 61 --- Defrost Termination Thermostat Open Failure

Alarm 61 is an indication of a DTT stuck open failure. It is activated if DTT is not sensed closed 30 minutes after power up or 30 minutes of compressor run time with primary return temperature below 7_C (45_F).

Alarm 62 --- Heater Alarm 62 is the heater alarm caused by improper

amperage resulting from heater activation (deactivation). Each phase of the power source is checked for proper amperage.

This alarm is a display alarmwith no resulting failure action, and will be reset by a proper amp draw of the heater.

Alarm 63 --- Compressor Motor Alarm 63 is triggered by improper current draw

increase (decrease) resulting from compressor turn on (off). The compressor is expected to draw a minimum of 2 amps; failure to do so will cause the alarm.

This is a display alarm with no associated failure action and will be reset by a proper amp draw of the compressor. Alarm 64 --- DataCORDER Low Battery

(not applicable for some units) Alarm 64 is an indication that the DataCORDER

battery is low. It is a display alarmandwill only be reset by replacement of the battery.

Alarm 65 --- Current Limit Alarm 65 is triggered within the current limiting

system. If the compressor is ON and current limiting procedures cannot maintain a current level below the user selected limit, the current limit alarm is activated.

This alarm is an inactive display alarm and is inactivated by power cycling the unit or changing the current limit via the code select Cd31.

TP00 (not applicable for some units) This alarm indicates that the memory is almost full

and the recorder will soon start to overwrite the oldest data.

TP01 (not applicable for some units) This alarm indicates that the recorder is overwriting

the oldest data. This will happen approximately every 55-62 days depending on the number of events that have been stored with the temperature data. It is recommended that data be downloaded from the recorder to safe storage at the end of each trip and no later thanwhen aTP00 alarmoccurs. Otherwise data will be lost.

NOTE TP00 and TP01 alarms are reset by trip starting the unit and then pressing the alarm reset and Enter key.

ERR # The microprocessor performs self-check routines. If

an internal failure occurs, an ERR #0-4 will appear on the display. This is an indication the microprocessor needs to be replaced.

LO

This message will be alternately displayed with the set point whenever the main voltage drops more than 20% of its proper voltage. The unit may operate at even lower voltages, but damage to motors may occur.

1.13.6 Pre-Trip Inspection

CAUTION

Pre-Trip inspection should not be performed with critically controlled cargoes loaded into the container.

The following is the sequence the microprocessor performs when pre-trip inspection is initiated. To initiate pre-trip, push the pre-trip key and within 5 seconds, the Enter key. As each test is successfully completed, the word pass will appear in the right-hand side display window. The individual test code is displayed in the left-hand side window.

If a failure should occur, the microprocessor will indicate this by displaying the word fail in the right window. The return and supply indicators will also alternately flash. This will continue until the user provides further instructions. Pressing the down arrow will cause the last test series to be repeated. This is recommended to avoid being misled by an erroneous reading. Pressing theuparrowwill start the next test in the sequence.

When no problems are encountered, pre-trip will finish and the unit will return to normal control mode operation. To exit pre-trip at any time, press the pre-trip key and hold it for 1 second. A delay of up to 5 seconds may be encountered.

NOTE The compressor time guard may be in effect upon completion of pre-trip. Consequently the compressor may not start for up to 6 minutes.

Tests are performed by measuring temperatures or amperage of the individually tested components. These values are compared to proper values and the Pass/Fail indication given.

Test Codes:

P Pre-Trip Initiated

All lights LEDs andLCDsegments are turned on for visual inspection.

P1-0 Heaters Turned On

Amperage measurements are made.

Failure is an indication of faulty heater(s) or improper wiring.

P1-1 Heaters Turned Off

Amperage should be zero.

Failure indicates contactor has remained (arced) closed, or current sensor is reading improperly.

P2-0 Preheaters Checked (If so Equipped)

See P1.

1-22Revised 8-6-93

P3-0 Low Speed Condenser Fan On

(If so Equipped) See P3-2.

P3-1 Low Speed Condenser Fan Off

(If so Equipped) See P1-1.

P3-2 High Speed Condenser Fan On

Amperagemeasurements aremade after 15 seconds.

Failure is an indication that themotor is defective, or didnt start due to bad contactor or defective wiring. Motor could also be heavily loaded (i.e. bad bearing).

P3-3 Condenser Fan Off

See P1-1.

P4-0 Low Speed Evaporator Motor Turned On

See P3-2 (1 Minute Test).

P4-1 Evaporator Motor Off

See P1-1.

P4-2 High Speed Evaporator Motor Turned On

See P3-2 (1 Minute Test).

P4-3 Evaporator Motor Off

See P1-1.

P5 Probe Tests

See P5-0 and P5-1, also, you should make note that during the pre-trip test, codes P5-0 and P5-1 will be seen only when a failure occurs.

P5-0 Return/Supply Probe Test

A temperature comparison is made between the returnand supply probes.High speedevaporator fans are run for 8 minutes to eliminate air temperature differences.

P5-1 Primary/Secondary Probe Test

(For unitwithDataCORDERonly) After 8minutes, the temperature difference between the primary and secondary probe (supply and return) is compared to a standard.

A failure may be due to some temperature extreme which existed before the test started and the test should be rerun. If still bad, check probes and connections and possibility of airflow restriction.

P6-0 Compressor Started And Runs for 45 Seconds

Check for a minimum current increase is made.

A failure indicates a compressor motor problem, or power source fault.

P6-1 Suction Modulation Valve Opening

The Modulation Valve is fully opened, for two minutes unless restricted by the current limiting function. A predetermined temperature difference, dependent upon the valve positionand box temperature is compared to the supply and return probe readings.

A failure indicates low capacity. This could be due to the modulation valve not opening as required, or some other restriction in the line, such as the filter drier. If the suction solenoid valve open test below fails, this would indicate that another part of the system is bad (i.e.

compressor). There is the possibility that a probe is in error, even if P5-0 passed. P6-2 Quench Valve Test

NOTE Some models have a thermostatic expansion quench valve, so quench valve test is NOT APPLICABLE for these models. To see which models have a solenoid quench valve refer to Section 5. The compressor suction temperature is measured

with the quench closed (Modulation Valve is at 20%). The quench is energized and the suction temperature drop after 60 seconds is checked.

A failure indicates a defective quench valve or improper wiring. Other possible causes are expansion valve not seating properly, unit lowon refrigerant charge, or a faulty suction temperature sensor. P6-3 Suction Modulation Valve (Closed)

The modulation and suction solenoid valve are closed and the unit is run for 5 minutes. The return and supply probe readings are to be within a range indicating a minimal capacity.

A failure indicates improper closing of the valve. The possibility of a faulty probe could also be examined. P6-4 Suction Solenoid Valve (69NT40)

The suction solenoid valve is opened (Modulation Valve closed). The supply and return probe temperature difference is compared to a predetermined value.

A failure indicates low capacity. This could be caused by the valve being defective or improperlywired. Also see P6-2 above. 1.13.7 DataCORDER (Optional)

Carrier Transicold has developed a microprocessor recorder for container refrigeration units which eliminates the mechanical recorder and paper chart, and replaces it with a solid state memory device capable of recording at one hour intervals, for a period of 62 days of continuous unit operation or, more practically, 120 calendar days average use.

This microprocessor temperature recorder, which we have termed the DataCORDER, has many additional capabilities which the old, mechanical chart recorder did not have.

The following data is stored and can be displayed in report form.

--- Trip Start Date --- Initial Set Point Temperature --- Supply Air Temperature --- Return Air Temperature --- Remote Probe Temperatures in the Container

(Cold treatment recording) --- Set Point Temperature Changes --- Power Outages --- Alarm Occurrences --- Defrost Occurrences --- Pre-Trip Occurrences --- Dehumidification mode Trip start date is activated by simultaneously holding

both Trip Start and Hours Since Last Trip Start keys.

1-23

The operator can displayHours Since Last Trip Start by just depressing and holding this keypad switch.

Each one hour interval of the DataCORDER is called a TIC. All events that occur are recorded at the TIC following the event. Multiple occurrences of the same event between TICs are not recorded; only the last event.

A special type of recording is provided for USDA cold treatment purposes. Cold treatment recording requires either two or three remote probes that are placed in the cargo at various locations. Provision is made to connect these probes to the DataCORDER via receptacles located at the rear left-hand side of the unit. Four receptacles are provided. Three (four pin) are for the probes and one (five pin) is provided for the interrogator. All receptacles are sized to accept a MIL-C-5015-14S size plug with a bayonet locking ring. The DataCORDER inputs are designed to accept a four wire PT100 RTD (resistance temperature detector) probe.

A label on the back panel of the unit shows which receptacle is used for each probe. TheUSDA#1 and#2 probes are installed in their receptacles. The other receptacle is used for the third cold treatment probe as well as the standard DataCORDER return probe. Therefore, when cold treatment is begun, the unit return probemust be removed from this receptacle and installed in a dummy receptacle next to it. The third cold treatment probe (referred to as the RTN probe) can then be installed.(See Figure 1-2.)

The five pin receptacle is used to latch in the USDA back-up battery and for probe calibration at the beginning of the cold treatment. These functions are performed by the interrogator with a special interconnecting cable and software. Contact the Carrier service representative for details.

TheDataCORDERrecords four probe temperature (supply, return, USDA #1 and USDA #2) every minute over the hour interval to calculate an average temperature for recording at the clock TIC. If the setpoint at the time of the TIC is within the cold treatment range of 27-38_F, it is assumed that a treatment is in progress and the temperatures recorded are snapshot or instantaneous values. If the setpoint is outside the cold treatment range, the average temperature is recorded.

The standard DataCORDER report displays the supply and return air temperatures. The cold treatment report displays USDA #1, USDA #2 and the return air temperature. Cold treatment recording is backed up by a battery so recordingcan continue if ACpower is lost. The battery capacity is sufficient to allow recording for eight days at 0_F ambient. After eight consecutive days of battery backed up recording, the controller automatically disconnects the battery from the DataCORDER to prevent its damage. The battery is housed in a module that also contains a charger tomaintainor restore battery capacity whenACpower is on. This module is located on a stud plate in the lower left corner of the unit.

When the dehumidification mode is activated or de-activated (ie., Code 32 is turned ON or OFF), this status is stored in the DataCorder memory and reported at the next TIC. Note: All microprocessors with revision 104 software will have dehumidification capability but someunits areNOTequippedwith ahumidistat. Refer to Table 1-1 model chart to see which units have a humidistat.

Two diagnostic alarms are provided for the DataCORDER.

TP00 --- This alarm indicates that the memory is almost full and the recorder will soon start to overwrite the oldest data.

TP01 --- This alarm indicates that the recorder is overwriting the oldest data. This will happen approximately every 55-62 days depending on the number of events that have been stored with the temperature data. It is recommended that data be downloaded from the recorder to safe storage at the end of each trip and no later than when a TP00 alarm occurs. Otherwise data will be lost.

NOTE TP00 and TP01 alarms are reset by trip starting the unit and then pressing the alarm reset and Enter key.

1.13.8 Communications

a. DataCORDER Retrieval --- Interrogation

Data retrieval from the DataCORDER can be accomplished with two devices: (1) a stand-alone DOS base portable computer with appropriate cable and software or (2) the Husky Hunter computer with appropriate cable and software. Both are battery operated portable computers. The main difference between them is that the Husky computer has smaller memory storage and consequently is designed to be used with a desktop PC for downloading, data storage and output processing. These functions can be performed on the portable computer using floppy disks. The main advantage of the Husky is its smaller size, weight and superior durability in harsh environments.

The interrogation software for the portable computer is supplied on a 3.5 inch floppy disk. This software allows interrogation, screen view of the data, hard copy report generation, cold treatment probe calibration, cold treatment initialization and file management. With a double sided double density disk, the portable computer can store approximately 2995 trip days of data. This is equivalent to interrogation of 100 units with an average trip length of 29.9 days.

With a fewmenu driven keystrokes, either computer can read the DataCORDER.

A short report on that interrogation can be displayed on the computer to identify key information such as Trip Start, Power Outages, and Temperature Out-of-Range conditions.

The Husky computer comes with an IBM PC compatible program loaded on a 5-1/4 floppy disk which allows the customer to custom install a report format to the users requirements.

1-24Revised 8-6-93

This installation program is easily loaded into the PC and is menu driven so that the portable computer can be programmed to provide the desired customer report format headings and revised easily by the customer.

The Husky computer can then be attached to the serial port interface on the 69NT unit to interrogate the DataCORDER. The computer has an LCD multi-line dotmatrix display which ismenu driven for ease of use by the operator.

TheHusky computer can store interrogation of up to 100 units for a maximum total of 750 trip days at an average of 7.5 days per unit or 50 units at an average of 15 days per unit.

After interrogation of many units is completed, the portable computer will display that it is full.

It can then be downloaded to directly print to a serial or parallel port printer (with a serial-to-parallel connection).

It also can be downloaded to aPC for storage onhard or floppy disks.

Once in disk storage it can be retrieved or downloaded to an analysis program for further analysis if desired and can be printed in tabular or graphical form.

b. Remote Monitoring

All data that was previously described as either stored or displayed can be transmitted to a remote monitoring unit (RMU) shipboard computer center.

This data includes the present operating temperatures, pressure, voltages, amperages and alarms defined by the code select functions.

This data also includes the temperature, set point changes, power outages, defrost initiation, and alarm occurrences that are stored in theDataCORDER for the last 1500 operating hours.

By way of 2-way communication, the shipboard computer center can initiate all functions and selectable features that are accessible at the unit such as set point change, pre-trip initiation, defrost initiation, etc.

The remote monitoring unit (RMU) may be field installed to the unit. Mountingbrackets for theRMUare provided behind the microprocessor control panel (Display).

Three wire harnesses are provided in the unit to interconnect the RMU (labeled CI for communications interface on the schematics) and the controller. One harness connects the RMU and controller current loop communication ports. Another provides 24 volt AC power to the RMU. The third connects the output port of the RMU to the 460 volt power line just ahead of CB1. Please refer to the unit schematic and wiring diagrams.

NOTE None of the harnesses are connected. Theymust be field connected when the RMU is installed.

1.13.9 Setting Function Codes Without AC Power (Optional)

For units equipped with software Revision 106 or greater, Battery Module Switch (BMS) and Battery Module or Disposable Batteries.

If the user wishes to enter a new set point or change the user selectable codes (Refer to section 1.13.1.i) without AC power hooked up to the unit the following procedure should be followed:

a. Make sure that the PN connector is hooked up to the battery module.

b. Set switch (BMS) to position 1.

c. Enter new set point by pressing the Up or Down Ar- row keys until the desired temperature is then reached. Then press the Enter key.

d. To change the user selectable codes, (Codes 26 through 32)must be accessed. Once the desired code is reached, the user may change the value of these functions to meet the operational needs of the con- tainer. (Refer to Section 1.13.4 for an explanation of the Function Codes.)

e. Once all desired entries have been made, switch the BMS switch to the 0 position.

NOTE The controller will give the user two minutes to make a keystroke. If a key is not pressed within the two minute period, the micro will enter an inactivemodeandDataLogwill appear on the display. To exit the inactive mode, simply switch the BMS switch to the 0 position.

To reactivate the controller after switching BMS to the 0 position, wait 10 seconds after the Data Log disappears, then switch the BMS to position 1.

Once the controller is activated, if a key is depressed within the initial two minute period, the controller will remain active for 30 seconds, thereafter. (i.e., If a key is pressed10 secondsafter the controller is activated, Data Log will appear 30 seconds later if no other keys are pressed.

CAUTION Anytime (BMS) is in position 1 and the refrigeration unit is not operating, the battery will be discharging. Therefore, the switch must be set to position 0 when battery power is not required.

1.14 USDA BATTERY MODULE (OPTIONAL) Units configured for USDA cold treatment contain

either a battery/chargermodule or a C size battery box. This allows for temperature and unit status recording while main system power (460/230) is not available or connected. The three pin power cable is used to latch in the USDA back-up battery box and for probe calibration at the beginning of the cold treatment. a. Operating Instructions

1. Unplug dummy plug (Item 4, Figure 1-8). 2. Connect power cable (2) to USDA battery

box module (3). (Install with flat side on plug body up)

1-25

CAUTION

Anytime power cable is connected tomodule and the refrigeration unit is not operating, the battery will be discharging. Therefore, the power cable must be unplugged from module except when performing cold treatment recording, calibration, or charging battery.

NOTE

Stow power cable in dummy receptacle and insert dummy plug in module receptacle to prevent corrosion of terminals when not in use.

b. Battery Check and Charging

Plug power cable into module and start unit or apply 24 vac to module. If low battery charge light illuminates, charge battery by operating unit or applying 24 vac to module until charge light extinguishes. Alternatively, install a module with a pre-charged battery. (When charging froman external source, apply 24 vac to pinPL2. Ground pin PL1.)

NOTE Normally, charging the battery until the light is extinguished will provide adequate power to perform cold treatment calibration without AC power available to unit. Depending on the ambient temperature and degree of discharge, charging for as little as one hour or asmuch as 24 hours could be required to extinguish the light. Charging for 4 to 6 hours after light is extinguished is required to fully charge battery.

1.15 USDA COLD TREATMENT PROCEDURE Sustained cold temperature has beenemployed as an

effective postharvest method for the control of the Mediterranean and certain other tropical fruit flies. Exposing infested fruit to temperatures of 2.2 degrees Celsius (36_F) or below for specific periods results in the mortality of the various stagesof this group of notoriously injurious insects.

In response to the demand to replace fumigation with this enviromentally sound process, Carrier has integrated this Cold Treatment capability into its microprocessor controller. Theseunits have the ability to maintain the container temperature within 1/4 degree Celsius of setpoint and recordminute changes in product temperature within the DataCORDER memory and thus meet USDA criteria (refer to section 1.13.7).

3

1

2

4

1. Dummy Receptacle 2. Power Cable

3. 12v DC Battery and Charger Module or 9 CSize Battery Box

4. Dummy Plug

Figure 1-8. USDA Battery Module

1-26Revised 8-6-93

The following is a summary of the steps required to initiate a USDA Cold Treatment.

a. Pre-cool the container to the treatment temperature or below.

b. The product should be pre-cooled to treatment temperature.

c. Latch in the USDA back-up battery box.

d. Probe calibration is achieved by ice bathing the three USDA probes and performing the Calibrate/Monitor Probes function on a DOS based portable computer or Husky interrogator. This calibration determines the three probe offsets.

e. The product is then loaded directly from the pre-cooling storage area to the container so that the product temperature does not rise.

f. Placement of probes --- there are three probes required for a USDA cold treatment procedure.

Sensor 1 Place in pulpof theproduct locatednext to the return air intake.

Sensor 2 Place in pulp of the product five feet from the end of the load for 40 ft. con- tainers and three feet from the end of the load for 20 ft. containers. This probe should be placed in a center car- ton at 1/2 the height of the load.

Sensor 3 Place in pulp of product five feet from the end of the load for 40 ft. containers and three feet from the end of the load for 20 ft. containers. This probe should be placed in a carton at a side wall at 1/2 the height of the load.

g. To initiate USDA Recording begin the cold treatment recording, connect the interrogator and select the Cold Treatment Initialization/Update option.

h. Interrogation software is available for DOS based personal computers which allow retrieval of trip data from the DataCORDER memory. Contact a Carrier service representative for details.

1.16 NITROGEN FEED (Optional)

Thepurposeof theoption is toprovide away to inject nitrogen into the air stream of the unit. This is done by connecting a nitrogen line to the quick-connect on the front of the unit, with a 1/4 nipple conforming to the MIL-C-4109. The nitrogen can then be feed into the unit with amaximumpressureof 35 PSIwhich gives a flowrate of 19.2 CFM.

WARNING

Do not use a nitrogen feed inlet pressure higher then 35 PSI.

0

5

10

15

20

25

30

35

0 2 4 6 8 10 12 14 16 18

INLET PRESSURE (PSIG)

FLOW RATE (CFM)

NITROGEN FEED FLOW RATE

1.17 HUMIDISTAT (OPTIONAL) NOTE

The supply air must be in-range or humidistat circuit will not energize.

The humidistat (Figure 1-2) is factory set at 70% relative humidity (R.H.) and is designed to operate when transporting a chill load (controller set above ---10_C (+14_F) and is locked out when the controller is set below ---10_C . a. The humidistat will be in operation if:

1. Supply air is in-range (in-range light illuminated).

2. Dehumidification control Code 32 is ON. 3. Controller is set above ---10_C (+14_F). 4. Container relative humidity reaches the 70%

R.H. setting of humidistat.

The above energizes the humidistat circuit to energize the heaters and heat light.

b. For testing purposes: WARNING

Beware of rotating evaporator fan when conducting following test.

1. Remove the front evaporator fan motor #1 access panel (see Figure 1-1). The humidistat is located behind this panel.

2. Set the controller set pointer within 2_C (3.6_F) of container supply air temperature.

3. Set the dehumidification control Code 32 to ON.

4. Turn the humidistat control knob until heaters are energized (heat light ON) and then reset control to 70% R.H. Replace access panel and lockwire.

1-27

AIR CIRCULATION ONLY

SET POINT

FALLING TEMPERATURE

RISING TEMPERATURE

---1.5_C (2.7_F)

---1_C (1.8_F)

---0.5_C (0.9_F) ---.20_C

+.20_C

+1.5_C (2.7_F)

+1_C (1.8_F)

+0.5_C (0.9_F)

COOLING

AIR CIRCULATION ONLY

COOLING

NOTE

For In-Range Tolerance, Refer to section 1.13.4 Code 29.

Figure 1-9. Controller Set Point Below ---10_C (+14_F)

1-28Revised 8-6-93

SET POINT

FALLING TEMPERATURE

RISING TEMPERATURE

---1.5_C (2.7_F)

---1_C (1.8_F)

---0.5_C (0.9_F) ---.20_C

+.20_C

+1.5_C (2.7_F)

+1_C (1.8_F)

+0.5_C (0.9_F)

HEATINGHEATING

MODULATING COOLING

AIR CIRCULATION ONLY

AIR CIRCULATION ONLY

MODULATING COOLING

NOTE

For In-RangeTolerance,Refer to section1.13.4Code29.

Figure 1-10. Controller Set Point Above ---10_C (+14_F)

2-1

SECTION 2

OPERATION

2.1 PRE-TRIP INSPECTION (Before Starting)

WARNING

Beware Of Unannounced Starting Of The Evaporator And Condenser Fans.

a. If container is empty, check inside for the following:

1. Check channels or T bars on floor for cleanliness. Channels must be free of debris for proper air circulation.

2. Check container panels, insulation and door seals for damage. Effect permanent or temporary repairs.

3. Visually check evaporator fan motor mounting bolts for proper securement.

4. Check for dirt or grease on evaporator fan or fan deck and clean if necessary.

5. Check evaporator coil for cleanliness or obstructions. Wash with fresh water. (Refer to section 4.13)

6. Check defrost drain pans and drain lines for obstructions and clear if necessary. Wash with fresh water.

7. Check panels on refrigeration unit for loose bolts and condition of panels. Make sure T.I.R. devices are in place on access panels.

b. Check condenser coil for cleanliness. Wash with fresh water. (Refer to section 4.16)

c. Check position of fresh air makeup vent cover. Operator must determine if fresh air makeup vent cover is to be opened or closed.

d. Open Partlow recording thermometer (if so equipped) door and do the following:

1. Manually wind clock on recording thermometer (key is located in a clip.) KEYMUSTSTAYWITHTHE THERMOMETER

2. Lift stylus (pen)by pushing in the stylus lifter and rotating the lifter clockwise (raising stylus at same time) until lifter locks in position.

3. Install new chart on recording thermometer making sure chart is under the four corner tabs. Release stylus lifter by pushing down and rotating lifter counterclockwise until stylus lifter locks in position and stylus has made contact with chart. Then close door.

e. Open Saginomiya recording thermometer (if so equipped) door and do the following:

1. Check Chart drive battery condition. (Refer to section 4.19)

2. Lift stylus (pen)by pushing in the stylus lifter and rotating the lifter clockwise (raising stylus at same time) until lifter locks in position.

3. Install new chart on recording thermometer making sure chart is under the four corner tabs. Release stylus lifter by pushing down and rotating lifter counterclockwise until stylus lifter locks in position and stylus has made contact with chart. Then close door.

f. Open control box door. Check for loose electrical connections or hardware.

g. Check color of moisture-liquid indicator.

h. Check oil level in compressor sight glass.

i. Start refrigeration unit. (Refer to section 2.3.)

2.2 STARTING AND STOPPING INSTRUCTIONS

CAUTION

Make sure that the unit circuit breaker(s) (CB) and the start-stop switch are in theOFFposition before connecting to any electrical power source.

a. Starting the Unit

1. Refer to Pre-Trip Inspection, section 2.1.

2. Check power source for proper voltage.Connect unit power plug and turn main power ON.

CAUTION On units with condenser fan switch (CFS), CFS must be in position 1 before starting unit unless cooling water is being supplied to water cooled condenser at a rate of 11 --- 26 lpm (3 --- 7 gpm).

3. Turn refrigeration unit circuit breaker(s), and the start-stop switch ON (position 1).

4. Units equipped with a DataCORDER:

Trip start date is activated by simultaneously holding both Trip Start and Hours Since Last Trip Start keys.

5. Refer to section 2.3 after unit is running.

b. Stopping the Unit

Turn the start-stop switch to position 0 (OFF position).

2.3 AFTER STARTING INSPECTION

a. Check rotation of condenser and evaporator fans.

b. Check compressor oil level.

c. Start microprocessor Pre-Trip Inspection. (Refer to section 1.13.6)

2-2

2.4 UNIT OPERATION

2.4.1 Cooling --- Controller Set Below ---10_C (+14_F)

NOTES

1. On Model 69NT40 units, the suction solenoid valve (SSV) opens to increase the refrigerant flow rate and cooling capacity at ---10_C (+14_F) unless SSV override is activated.

2. In the frozen range the suction modulation valve is 100% open.

3. The quench solenoid valve will not be energized at this time as the suction modulation valve position is greater than 40% open.

4. Some Models have a thermostatic expansion quench valve. To see which Models have a solenoid quench valve refer to Section 5.

5. Setting the controller below ---10_C (+14_F) on units with two-speed motors will place themotors in low speed (contactor ES energizes).

When the return air temperature decreases to 0.2_C (0.4_F) below set point, relays TC and TN de-energizes. This results in de-energizing the compressor and condenser fanmotor. Also, the cool light is de-energized. The evaporator fan motors continue to run to circulate air throughout the container.

When the return air temperature increases to 0.2_C (0.4_F) above set point, and providing a sufficient off time period has elapsed, relays TC and TN energizes to restart the compressor. Also, at this time, the condenser fan motor starts and the cool light is illuminated.

2.4.2 Controller Set Above ---10_C (+14_F)

NOTE

Setting the controller above ---10_C (+14_F) on units with two-speed motors will place the motors in high speed (relay EF energizes). (Contactor ES de-energizes)

a. Cooling (See Figure 2-1.)

With decreasing supply air temperature and if the supply air is above set point, the unit will be cooling with the condenser fan motor, compressor motor and evaporator fan motors energized. Also, at this time, the cool light is illuminated.

When the air temperature decreases to a tolerance above set point, relay TI energizes and the in-range light is illuminated. (Refer to section 1.13.4. Code 29).

If the air temperature continues to fall, modulating cooling starts at approximately 0.2_C (0.4_F) above set point. The modulating valve will have a variable current up to 1.30 amps at full modulation. At this time, it is possible for the quench solenoid valve to energize before the compressor shuts off as the valve energizes with a minimum amp draw of 0.60. The quench solenoid valve will de-energize if the modulation valve exceeds 60%.

NOTE

Some Models have a thermostatic expansion quench valve. To see which Models have a solenoid quench valve refer to Section 5.

During this cooling mode, a running sum of the temperature differential (supply air temperature --- set point) is kept. When the supply air falls below set point, thedifferential is negative. The longer supply air remains below set point, the more negative the running sum becomes.

When the supply air temperature decreases to 0.2_C below set point and the running sum is less than ---250 degrees C seconds, relays TN and TC de-energize shutting off the condenser fan and compressor motors. Also, the cool light is de-energized.

The evaporator fan motors continue to run to circulate air throughout the container. The in-range light remains illuminated as long as the supply air is within a tolerance of set point.

If the unit is in the holding mode (neither heating or cooling) and the supply air temperature increases to 0.2_C (0.4_F) above set point, and providing a 6 minute off time has elapsed, relay TC energizes to restart the compressor. Also, at this time, the condenser fan motor starts and the cool light is illuminated.

2-3

TO CONTROL TRANSFORMER

= Energized Circuit = De-energized Circuit

Figure 2-1. Cooling

2-4

b. Heating (See Figure 2-2.)

The unit will only heat when the controller is set above ---10_C (+14_F) as relay TH is electronically locked out to prevent heating when the controller is set below ---10_C (+14_F).

If the air temperature decreases 0.5_C (0.9_F)below controller set point, TH closes and the system enters the heatingmode which is designed to raise the container air temperature. When TH closes, power flows through TH contacts and the heat termination thermostat to energize the heat relay (HR). This in turn energizes the heaters and heat light. The evaporator fans continue to run to circulate air throughout the container.

As the supply air decreases to the in-range tolerance below set point, relay TI and the in-range light de-energize (after 15minutes time delay) andwill remain de-energized until the supply air increases to a tolerance below set point. (Refer to section 1.13.4 Code 29)

When the temperature rises to 0.2_C (0.4_F) below set point, TH opens (heating off) and the system again enters the holding zone. The compressor and condenser fanmotor are not running as contactorsC and CF remain de-energized. The evaporator fans continue to run to circulate air throughout the container.

A safety heater termination thermostat (HTT) attached to an evaporator coil support, set to open at 54.5_C (130_F) will open the heating circuit if overheating occurs.

TO CONTROL TRANSFORMER

= Energized Circuit = De-energized Circuit

Figure 2-2. Heating Mode

2-5

2.4.3 Defrost (See Figure 2-3.)

Refer to section 1.13.4 (Code 26) for description of the defrost interval selector and automatic defrost initiation.

When the defrost mode is initiated, the controller relay contacts (TH) close to supply power to the heat relay (HR)and in turn, energizes thedefrost heaters. The defrost light is illuminated.

TC opens to de-energize the compressor contactor and cool light. Also (TN) relay opens to de-energize the condenser fan motor contactor (CF).

Also (TE & TV) relays open to stop the evaporator fan motors.

The in-range light remains illuminated during defrost.

When the coil temperature reaches 24_C (75_F) defrost termination thermostat (DTT)opens to interrupt the defrost cycle and the unit returns to its normal function.

The 54.5_C (130_F) heat termination thermostat (HTT) will open the circuit if the defrost mode does not terminate at 24_C (75_F). The controller will terminate defrost if termination does not occur within 1.0 to 1.5 hours depending on voltage. An alarm will be given of a possible DTT failure.

When the return air falls to 7_C (45_F), the controller checks to ensure defrost termination thermostat (DTT) closed properly. If not, a DTT failure alarm is given and the defrost mode is operated off of return temperature sensor (RTS). The defrost mode will be terminated after one hour by the controller.

TO CONTROL TRANSFORMER

= Energized Circuit = De-energized Circuit

Figure 2-3. Defrost

2-6

Table 2-1. Electrical Control Positions --- Above ---10_C (+14_F)

CONTROL CIRCUIT COOLING HOLDING ZONE

* Dehumidifica- tion

HEATING DEFROST

Compressor Contactor (C) Energized De-energized Energized De-energized De-energized

Condenser Fan Motor Contactor (CF) Energized De-energized Energized De-energized De-energized

One Speed Evaporator Motor Relay (EF) Energized Energized Energized Energized De-energized

Two Speed Evaporator Motor Relay (EF)

Energized at set points above -10_C (14_F) De-energized

Two Speed Evaporator Motor Relay (ES)

De-energized at set points above -10_C (14_F)

Defrost Relay (DR) De-energized De-energized De-energized De-energized Energized

Heater Relay (HR) De-energized De-energized Energized Energized Energized

Quench Solenoid (QV) Refer to paragraph 1.13.4 Code 02

De-energized Refer to paragraph 1.13.4 Code 02

De-energized De-energized

INDICATING LIGHTS

Cool ON OFF ON OFF OFF

Defrost OFF OFF OFF OFF ON

In-Range On - If In-Range (Refer to paragraph 1.13.4, Code 29)

Heat OFF OFF ON ON ON

POWER CIRCUIT

Compressor Energized De-energized Energized De-energized De-energized

Condenser Fan Motor Energized De-energized Energized De-energized De-energized

Heaters De-energized De-energized Energized Energized Energized

Evaporator Fan Motors Energized Energized Energized Energized De-energized

Table 2-2. Electrical Control Positions --- Below ---10_C (+14_F)

CONTROL CIRCUIT COOLING HOLDING ZONE

**Dehumidifica- tion

HEATING DEFROST

Compressor Contactor (C) Energized De-energized ** ** De-energized

Condenser Fan Motor Con- tactor (CF) Energized De-energized ** ** De-energized

One Speed Evaporator Motor Relay (EF) Energized Energized ** ** De-energized

Two Speed Evaporator Motor Relay (EF)

De-energized at set points below -10_C (14_F)

Two Speed Evaporator Motor Relay (ES)

Energized at set points below -10_C (14_F) De-energized

Defrost Relay (DR) De-energized De-energized ** ** Energized

Heater Relay (HR) De-energized De-energized ** ** Energized

Quench Solenoid (QV) Refer to paragraph 1.13.4 Code 02

De-energized ** ** De-energized

INDICATING LIGHTS

Cool ON OFF ** ** OFF

Defrost OFF OFF ** ** ON

In-Range On - If In-Range (Refer to paragraph 1.13.4, Code 29)

Heat OFF OFF ** ** ON

POWER CIRCUIT

Compressor Energized De-energized ** ** De-energized

Condenser Fan Motor Energized De-energized ** ** De-energized

Heaters De-energized De-energized ** ** Energized

Evaporator Fan Motors Energized Energized ** ** De-energized

* Unit with optional Humidistat (Refer to section 1.17)

** Dehumidification and heating modes do not operate at set points below -10_C (14_F)

3-1

SECTION 3

TROUBLESHOOTING

INDICATION/ REFERENCE TROUBLE POSSIBLE CAUSES SECTION

3.1 UNIT WILL NOT START OR STARTS THEN STOPS No power to unit External power source OFF Turn on

Start-Stop switch OFF or defective Check Circuit breaker tripped or OFF Check

Loss of control power Circuit breaker OFF or defective Check Control transformer defective (TR) Replace Fuse blown (3A or 6A) Check Start-Stop switch OFF or defective Check Evaporator fan motor internal protector open 4.14 Condenser fan motor internal protector open 4.17 Compressor internal protector open 4.5 High pressure switch open 3.7

Compressor hums, Low line voltage Check but does not start Single phasing Check

Shorted or grounded motor windings 4.5 Compressor seized 4.5

3.2 UNIT RUNS BUT HAS INSUFFICIENT COOLING Compressor Compressor valves defective 4.5

Refrigeration System Abnormal pressures 3.7 Temperature controller malfunction 3.9 Evaporator fan or motor defective 4.14 Modulating solenoid valve malfunction 4.25 Suction solenoid valve malfunction 1.11/4.24

3.3 UNIT OPERATES LONG OR CONTINUOUSLY IN COOLING Container Hot load Normal

Defective box insulation or air leak Repair

Refrigeration System Shortage of refrigerant 4.2/4.4 Evaporator coil covered with ice 3.6 Evaporator coil plugged with debris 4.13 Evaporator fan(s) rotating backwards 4.14/4.27 Defective evaporator fan motor/capacitor 4.14/4.27 Air bypass around evaporator coil Check Controller set too low Reset Compressor service valves or liquid Open valves line shutoff valve partially closed completely Dirty condenser 4.16 or 4.21 Compressor worn 4.5 Current limit (Code 31) set to wrong value 1.13.4

3-2

INDICATION/ REFERENCE TROUBLE POSSIBLE CAUSES SECTION

3.4 UNIT WILL NOT HEAT OR HAS INSUFFICIENT HEATING

No power to unit Start-Stop switch OFF or defective Check Circuit breaker OFF or defective Check External power source OFF Turn on

No control power Circuit breaker or fuse defective Replace Transformer defective (TR) Replace Condenser fan internal motor protector open 4.17 Evaporator fan internal motor protector open 4.14 Heat relay defective Check

Heater termination switch open 4.13

Unit will not heat or Heater(s) defective 4.15 has insufficient heat Heater contactor or coil defective Replace

Evaporator fan motor(s) defective or rotating backwards 4.14/4.27 Evaporator fan motor contactor defective Replace Temperature controller malfunction 3.9 Defective wiring Replace Loose terminal connections Tighten Low line voltage 1.5

3.5 UNIT WILL NOT TERMINATE HEATING

Unit fails to stop Temperature controller improperly set Reset heating Temperature controller malfunction 3.9

Heater termination switch remains closed along with the heat relay 4.13

3.6 UNIT WILL NOT DEFROST PROPERLY

Will not initiate Defrost timer malfunction 1.13.4 defrost automatically Loose terminal connections Tighten

Defective wiring Replace Defrost termination or heat termination switch open 4.13 Heater contactor or coil defective Replace

Will not initiate Manual defrost switch defective Replace defrost manually Defrost termination switch open 2.4.3

Initiates but relay (DR) drops out Low line voltage 1.5

Initiates but does not Heater contactor or coil defective Replace defrost Heater(s) burned out 4.15

Frequent defrost Wet load Normal

3-3

INDICATION/ REFERENCE TROUBLE POSSIBLE CAUSES SECTION

3.7 ABNORMAL PRESSURES (COOLING)

High discharge pressure Condenser coil dirty 4.16 or 4.21 Condenser fan rotating backwards 4.17 Condenser fan inoperative 4.17 Refrigerant overcharge or noncondensibles 4.4 Quench solenoid valve malfunction 4.12 Condenser fan switch (CFS) (If used) in position 0 when water is not circulating thru water-cooled Condenser. Check

Low suction pressure Suction service valve partially closed Open Filter-drier partially plugged 4.10 Low refrigerant charge 4.2/4.4 Expansion valve defective 4.26 No evaporator air flow or restricted air flow 3.10 Excessive frost on evaporator coil 3.6 Evaporator fan(s) rotating backwards 4.14/4.27

3.8 ABNORMAL NOISE OR VIBRATIONS

Compressor Loose mounting bolts Tighten Worn bearings 4.5 Worn or broken valves 4.5 Liquid slugging 3.11 Insufficient oil 4.8

Condenser or Bent, loose or striking venturi Check Evaporator Fan Worn motor bearings 4.14/4.17

Bent motor shaft 4.14/4.17

3.9 TEMPERATURE CONTROLLER MALFUNCTION Will not control Defective Sensor 4.23

Defective wiring Check

3.10 NO EVAPORATOR AIR FLOW OR RESTRICTED AIR FLOW

Evaporator coil Frost on coil 3.6 blocked Dirty coil 4.13

No or partial Evaporator fan motor internal protector open 4.14 evaporator air flow Evaporator fan motor(s) defective 4.14/4.27

Evaporator fan(s) loose or defective 4.14

3-4

INDICATION/ REFERENCE TROUBLE POSSIBLE CAUSES SECTION

3.11 EXPANSION VALVE MALFUNCTION

Low suction Low refrigerant charge 4.2/4.4 pressure with high External equalizer line plugged Open superheat Wax, oil or dirt plugging valve or orifice 4.26

Ice formation at valve seat 4.2/4.3 Superheat too high 4.26.c Power assembly failure 4.26 Loss of element/bulb charge 4.26 Broken capillary 4.26 Foreign material in valve

High suction Superheat setting too low 4.26.c pressure with low External equalizer line plugged Open superheat Ice holding valve open 4.2/4.3

Foreign material in valve 4.26

Liquid slugging in Pin and seat of expansion valve eroded or compressor held open by foreign material 4.26

Fluctuating suction Improper bulb location or installation 4.26 pressure Low superheat setting 4.26.c

3.12 WATER-COOLED CONDENSER OR WATER PRESSURE SWITCH MALFUNCTION

High discharge Dirty coil 4.21 pressure Noncondensibles

Condenser fan switch (CFS) (If used) in position 0 when water is not circulating thru water-cooled Condenser. Check

Condenser fan Water pressure switch malfunction Check starts and stops Water supply interruption

3.13 STEP-UP POWER TRANSFORMER MALFUNCTION

Unit will not start Circuit breaker (CB-2) tripped Check Step-up transformer internal protector open 4.22 Step-up transformer defective 4.22 Power source not turned ON Check

4-1

SECTION 4

SERVICE

4.1 REMOVING THE REFRIGERANT NOTE

To avoid damage to the earths ozone layer, use a refrigerant recovery system whenever removing refrigerant.

To Service any High and Low Side Refrigeration Component:

Store the refrigerant charge in an evacuated container. Attach hose (line) to liquid line valve to remove liquid refrigerant.

4.2 REFRIGERANT LEAK CHECKING a. The recommended procedure for finding leaks in a system is with a halide torch or electronic leak detector. Testing joints with soapsuds is satisfactory only for locating large leaks.

b. If the systemiswithout refrigerant, charge the system with refrigerant to build up pressure between 2.1 to 3.5 kg/cm@ (30 to 50 psig). Remove refrigerant drumand leak check all connections.

NOTE It must be emphasized that only the correct refrigerant drum be connected to pressurize the system. Any other gas or vapor will contaminate the system which will require additional purging and evacuation of the high side (discharge) of the system.

c. Remove refrigerant using a refrigerant recovery system and repair any leaks.

d. Evacuate and dehydrate the unit. (Refer to section 4.3)

e. Charge unit per section 4.4.

4.3 EVACUATION AND DEHYDRATION

4.3.1 General Moisture is the deadly enemy of refrigeration

systems. The presence of moisture in a refrigeration system can have many undesirable effects. The most common are copper plating, acid sludge formation, freezing-up of metering devices by free water, and formation of acids, resulting in metal corrosion.

4.3.2 Preparation a. Evacuate and dehydrateonly afterpressure leak test. (Refer to section 4.2.)

b. Essential tools to properly evacuate and dehydrate any system include a vacuum pump (8 m@H = 5 cfm volume displacement, P/N 07-00176-01) and electronic vacuum gauge.

c. Keep the ambient temperature above 15.6_C (60_F) to speed evaporation of moisture. If ambient temperature is lower than 15.6_C (60_F) ice might form before moisture removal is complete. Heat lamps or alternate sources of heat may be used to raise the system temperature.

d. Replace the filter-drier with a section of copper tubing with the appropiate fittings. This idea will help speed up the evacuation procedure.

4.3.3 Procedure

1. Refrigerant Recovery Unit 2. Refrigerant Cylinder 3. Evacuation Manifold 4 Valve 5. Vacuum Pump 6. Electronic Vacuum Gauge 7. Liquid Line Valve 8. Condenser Coil 9. Suction Service Valve 10. Compressor 11. Discharge Service Valve 12. Evaporator Coil

1

2

3

4

5

6

78

9

1011

12

4

4

Figure 4-1. Vacuum Pump Connections

a. Remove all refrigerant using a refrigerant recovery system.

b. The recommended method to evacuate and dehydrate the system is to connect three evacuation hoses (Do not use standard service hoses, as they are not suited for evacuation purposes.) as shown in Figure 4-1 to the vacuum pump and refrigeration unit. Also, as shown, connect a evacuation manifold, with evacuation

4-2

hoses only, to the vacuum pump, electronic vacuum gauge, and refrigerant recovery system.

c. With the unit service valves closed (back seated) and the vacuum pump and electronic vacuum gauge valves open, start the pump and draw a deep vacuum. Shut off the pump and check to see if the vacuum holds. This operation is to test the evacuation setup for leaks, repair if necessary.

d. Midseat the refrigerant system service valves.

e. Then open the vacuum pump and electronic vacuum gauge valves, if they are not already open. Start the vacuumpump. Evacuate unit until the electronic vacuum gauge indicates 2000 microns. Close the electronic vacuum gauge and vacuum pump valves. Shut off the vacuum pump. Wait a fewminutes to be sure the vacuum holds.

f. Break the vacuumwith clean dry refrigerant gas.Use refrigerant that the unit calls for. Raise system pressure to approximately 2 psig by monitoring it with the compound gauge.

g. Remove refrigerant using a refrigerant recovery system.

h. Repeat steps e through g one time.

i. Remove the copper tubing and change the filter-drier. Evacuate unit to 500 microns. Close the electronic vacuum gauge and vacuum pump valves. Shut off the vacuum pump. Wait five minutes to see if vacuum holds. This checks for residual moisture and/or leaks.

j. With a vacuumstill in the unit, the refrigerant charge may be drawn into the system from a refrigerant container on weight scales. The correct amount of refrigerant may be added by observing the scales. (Refer to section 4.4)

4.4 ADDING OR CHECKING THE REFRIGERANT CHARGE

4.4.1 Checking the Refrigerant Charge

NOTE 1. Set the controller set point to ---25_C (---13_F) to ensure that the modulating solenoid valve is fully open when checking operation of unit.

2. The refrigerant level should only be checked when the unit is running with the modulating solenoid valve fully open. The container temperature should be approximately 1.7_C (35_F) or ---17.8_C (0_F).

a. Connect the gauge manifold to the compressor discharge and suction service valves.

b. Units equipped with the optional water-cooled condenser, check charge only on air-cooled operation. Refrigerant level on water-cooled operation will be normally above sight glass. Partially block the condenser coil inlet air starting from the front of the condenser coil. Increase the area blocked until the compressor discharge pressure is raised to approximately 12 kg/cm@ (175 psig). Refrigerant should appear at center line of sight glass on the water-cooled condenser. If not, refer to section 4.4.3.

Units equipped with air-cooled condenser only, partially block the condenser coil inlet air starting from the front of the condenser coil. Increase the area blocked until the compressor discharge pressure increases to approximately 13 kg/cm@ (190 psig) with the container temperature about 2_C (35_F) or 11 kg/cm@ (160 psig) with the container temperature about ---18_C (0_F). Allow the system to stabilize for 5 minutes of continuous operation maintaining the head pressure at the proper level. Proceed to step c.

c. For units with air-cooled condenser only, check the liquid line sight glass. If the sight glass appears clear with no bubbles visible or only occasional intermittent bubbles, then the unit has anadequate charge. If the sight glass appears to be flashing or bubbles are constantly moving through the sight glass, then the unit may have a low refrigerant charge, or the filter-drier could be partially plugged.Refer to section4.10. If it is determined that the filter-drier is not restricted, then it will be necessary to add some refrigerant to the system. Refer to section 4.4.3.

4.4.2 Adding Refrigerant to System (Full Charge) a. Evacuate unit and leave in deep vacuum. (Refer to section 4.3.)

b. Place drum of R-12 on scale and connect charging line from drum to liquid line valve. Purge charging line at liquid line valve and then note weight of drum and refrigerant.

c. Open liquid valve on drum. Open liquid line valve half-way and allow the liquid refrigerant to flow into the unit until the correct weight of refrigerant has been added as indicated by scales. Correct charge is noted in Table 1-1.

NOTE It may be necessary to finish charging unit through suction service valve in gas form, due to pressure rise in high side of the system. (Refer to section 4.4.3.)

d. Backseat liquid line valve (to close off gauge port). Close liquid valve on drum. Crack connection on charging line at liquid line valve to vent charging line.

e. Start unit in cooling mode. Run approximately ten minutes and check the refrigerant charge. (Refer to section 4.4.1.b.)

4.4.3 Adding Refrigerant to System (Partial Charge)

a. Examine the unit refrigerant system for any evidence of leaks. Repair as necessary. (Refer to section 4.2.)

b. Maintain the conditions outlined in section 4.4.1.

c. Fully backseat (to close off gauge port) the suction service valve (see Figure 1-3) and remove the 1/4 flare cap.

d. Connect charging line between suction service valve port and drum of refrigerant-12. Open VAPOR valve.

e. Partially frontseat (turn clockwise) the suction service valve and slowly add charge until the refrigerant appears at the proper level (refer to section 4.4.1).

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4.5 REPLACING THE COMPRESSOR (See Figure 4-2.)

WARNING Make sure power to the unit is OFF and power plug disconnected before replacing the compressor.

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1. Discharge Valve Flange 2. High Pressure Switch Connection 3. Low Pressure Connection 4. Suction Valve Flange 5. Motor End Cover 6. Serial/Model No. Plate 7. Sight Glass 8. Bottom Plate 9. Oil Drain Plug 10. Bearing Head 11. Oil Pump (See Figure 4-3) 12. Oil Fill Plug (Refer to paragraph 4.8.c.) 13. Cylinder Head 14. Valve Plate

Figure 4-2. Compressor --- Model 06DR

GEAR PUMPVANE PUMP

Figure 4-3. Oil Pump

There are two types of oil pumps; vane and gear. Force-feed lubricationof the compressor is accomplished by a oil pump driven directly from the compressor crankshaft. Refrigeration oil is drawn from the compressor crankcase through the oil filter screen and pick up tube to the oil pump located in the bearing head assembly. The crankshaft is drilled to enable the pump to supply oil to the main bearings, connecting rod bearings, and the shaft seal.

NOTES 1. Check the compressor Serial/Model Number plate for CFM displacement, refer to Table 1-2. 2. The service replacement compressor is sold without shutoff valves (but with valve pads), and without terminal box and cover. Customer should retain the original terminal box, cover, and high pressure switch for use on replacement compressor. 3. Check oil level in service replacement compressor. If none, add 4.0 liters (8.5 U.S. pints). (Refer to sections 1.3.b. and 4.8.) 4. A terminal block kit must be ordered as a separate item when ordering replacement compressor. Appropriate installation instructions are included with kit.

5. Refer to Table 4-1 and Table 4-2, for applicable compressor wear limits and torque values.

a. Remove the protective guard from lower section of the unit.

b. If the compressor is inoperative and the unit still has refrigerant pressure. Remove refrigerant. (Refer to section 4.1)

c. Disconnect wiring in the compressor junction box after identifying same. Disconnect wiring from compressor terminals and remove compressor junction box.

d. Remove bolts from service valve flanges.

e. Remove compressor plate mounting bolts.

f. Remove compressor and mounting plate. The compressor weighs approximately 118 kg (260 pounds).

g. Remove high pressure switch (HPS) from compressor and check operation of switch (refer to section 4.11.2).

h. Remove compressor mounting bolts from mounting plate and install mounting plate on replacement compressor.

i. Install replacement terminal block kit (following instructions included with kit).

j. Install high pressure switch on compressor.

k. Install compressor and mounting plate in unit.

l. Install junction box to compressor and connect all wiring per wiring diagram and then install junction box cover.

m. Install new gaskets on service valves.

n. Install mounting bolts in service valves and torque to a value of 2.77 to 4.15 mkg (20-30 ft/lb).

o. Change filter-drier. (Refer to section 4.10)

p. Attach two lines (with hand valves near vacuum pump) to the suction and discharge service valves. Dehydrate and evacuate compressor to 500microns (75.9 cm HG vacuum = 29.90 inches Hg vacuum). Turn off valves on both lines to pump.

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q. Fully backseat (open) both suction and discharge service valves.

r. Remove vacuum pump lines.

s. Start unit and check refrigerant charge. (Refer to section 4.4.1.b.)

t. Checkmoisture-liquid indicator for wetness.Change filter-drier if necessary. (Refer to sections 4.9 and 4.10)

u. Check compressor oil level per section 4.8.a. Add oil if necessary. (Refer to section 4.8.b.)

4.6 COMPRESSOR DISASSEMBLY

NOTE Removing the press fit stator in the field is not recommended. The rotor and stator are a matched pair and should not be separated.

When disassembling compressor, matchmark parts so they may be replaced in their same relative positions. (See Figure 4-2 for an illustration of the compressor.) Refer to Table 4-1 and Table 4-2 for compressor wear limits and bolt torque values.

a. Place the compressor in a position where it will be convenient to drain the oil. Remove the oil plug on oil pump inlet passage (See Figure 4-6 for location) to vent the crankcase. Loosen the drain plug (See Figure 4-2) in bottom plate and allow the oil to drain out slowly. Remove the plug slowly to relieve any crankcase pressure. A plug in the bottom center of the crankcase may also be removed for draining the motor end more quickly. (Some units do not have this plug.)

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6 1. Cylinder Head Gasket 2. Discharge Valve Screw and Lockwasher 3. Discharge Valve Stop 4. Discharge Valve 5. Valve Plate 6. Valve Plate Assembly 7. Valve Plate Gasket

Figure 4-4. Exploded View of Valve Plate

b. Remove cylinder head capscrews. If the cylinder head is stuck, tap the cylinder headwith a wooden or lead mallet. Be careful not to drop the head or damage the gasket sealing surface. (See Figure 4-2 and Figure 4-4.) Remove cylinder head gasket.

c. Free the valve plate from the cylinder deck by using the discharge valve hold down capscrews as jack screws through the tapped holes of the valve plate after the valve

stops and valves have been removed. Remove the valve plate gasket. (See Figure 4-4.)

d. Turn the compressor over on its side and remove the bottom plate. Remove the bolts and connecting rod caps (See Figure 4-5). Match mark each connecting rod cap and connecting rod for correct reassembly. Push the piston rods up as far as they will go without having the piston rings extend above the cylinders.

e. If necessary, remove the oil return check valve. Inspect it for check valve operation (flow in one direction only). Replace assembly if its check valve operation is impaired. (See Figure 4-5.)

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1. Oil Pressure Relief Valve 2. Oil Return Check Valve 3. Oil Suction Tube 4. Capscrew 5. Connecting Rod and Cap Assembly

Figure 4-5. Bottom Plate Removed

CAUTION The copper tube which connects to the oil suction strainer extends out the bottom with the bottom plate removed. Take precautions to avoid bending or breaking it while changingcrankcase positions.

f. There are two types of oil pumps; vane and gear. See Figure 4-3 to identify which oil pump is used, then follow the correct procedure below.

Vane Oil Pump:

1. Remove the oil pump cover capscrews (See Figure 4-2). This will free the oil feed guide retaining spring cover gasket, and the oil feed guide. (See Figure 4-6.) Hold piston to prevent shaft from turning if necessary.

2. Remove the oil pump drive segment screws and lockwashers before the bearing head is removed. (See Figure 4-6.) Unscrew the bearing head capscrews, remove the bearing head, and then remove the bearing head gasket.

3. With the pump-end bearing head removed from the compressor, remove theplunger retaining rings with snap ring pliers. As each retaining ring is removed, the spring guide, vane spring and pump vane may be removed from the vane cylinder in the bearing head. (See Figure 4-6.)

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4. Push the pump rotor out of the bearing head by forcing against the rotor with a thumb. Force from the bearing side and remove from the opposite side. The pump rotor retaining ring will come out with the rotor.

5. A new bearing head complete with oil pump should be obtained from Carrier Transicold as a replacement to eliminate oil pump trouble. However, if the cause of pump failure can be determined in the field, replacement parts may be ordered from Carrier Transicold to repair the pump.

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1. Oil Pump Cover 2. Cover Gasket 3. Capscrews and

Lockwashers 4. Oil Pump Drive 5. Rotor Retaining Ring 6. Pump Vane Cylinder 7. Pump Vane 8. Vane Spring

9. Retaining Ring 10. Spring Guide 11. Bearing Head 12. Pump Rotor 13. Oil Feed Guide 14. Retainer Spring 15. Capscrews and

Washers 16. Oil Inlet Passage

TOP

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11 5

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3

Figure 4-6. Vane Oil Pump and Bearing Head Gear Oil Pump:

1. Remove eight capscrews and remove oil pump bearing head assembly, gasket and thrust washer. (See Figure 4-7.)

2. If it was determined that the oil pump was not operating properly, the entire oil pump and bearing head assembly must be replaced. Replacement parts for the pump are not available.

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1. Oil Pump & Bearing Head 2. Thrust Washer (Gear Pump Only) 3. Oil Pickup Tube 4. Oil Inlet Port

Figure 4-7. Gear Oil Pump and Bearing Head

g. Be very careful not to damage the motor windings when removing the motor end cover as the cover fits over thewinding coils. Remove all capscrews except one in the top of the cover. Then, while holding the cover in place, remove the remaining capscrew. Do not allow the cover to drop from its own weight. To prevent striking the winding, move the cover off horizontally and in line with the motor axis.

h. Remove the refrigerant suction strainer and if it is removed with ease it may be cleaned with solvent and replaced. (See Figure 4-8.) If the strainer is broken, corroded or clogged with dirt that is not easily removed, replace the strainer. Install newgaskets upon reassembly.

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1. Valve Capscrew 2. Suction Service Valve 3. Valve Gasket 4. Motor End Cover 5. Motor End Cover Gasket 6. Suction Strainer 7. Strainer Screws and Washers

Figure 4-8. Motor End Cover

i. Block the compressor crankshaft so that it cannot turn. Use a screw driver to bend back the tabs on the lockwasher and remove the equalizer tube. (See Figure 4-10.) The slinger at the end of the shaft draws

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vapor from the crankcase. It may discharge through a tee or a single equalizer tube.

j. If the piston rings extend beyond the cylinder tops, the pistons can be pulled through the bottom plate opening after the piston rings are compressed. A piston ring squeezer made from sheet metal which almost encircles the periphery of the rings, will facilitate removal. Each piston pin is locked in place by lock rings which are snapped into grooves in the piston wall.

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1. Capscrew 2. Cap 3. Crankshaft 4. Thrust Washer 5. Rotor Drive Key

6. Connecting Rod 7. Compression Ring 8. Piston 9. Pin 10. Retainer

Figure 4-9. Crankshaft Assembly

k. Since the stator is not replaced in the field, the terminal plate assembly need not be disturbed unless a leak exists or a terminal part requires replacing.

Disassemble and assemble the terminal plate as shown in Figure 4-11.

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3

1. Equalizer Tube and Lockscrew Assy 2. Lockwasher 3. Counterweight --- Motor End

Figure 4-10. Removing Equalizing Tube and Lock Screw Assembly

The terminal mounting plate assembly as originally installed is assembled soas to leave a small spacebetween the outer terminal bushing and the surface of the mounting plate. This is to provide further crush of the terminal bushing in case a leak should occur. To stop leak, tighten the terminal bushing nut only enough to stop the escape of gas. Do not tighten until terminal bushing is flush with the mounting plate. The tightening torque used at the factory is 0.21 to 0.23 mkg (18 to 20 inch pounds)maximumto prevent damage to the plasticparts.

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NOTE: Parts shown are for one terminal. 1. Terminal Bushing Nut 2. Lock Washer 3. Terminal Washer 4. Outer Terminal Bushing 5. O-Ring 6. Terminal Bushing Washers (Grey) 7. Terminal Bushing Washers (Red) 8. Inner Terminal Bushing 9. Terminal Mounting Plate 10. Cover Gasket 11. Inner Terminal Block 12. Terminal Screw

Figure 4-11. Terminal Mounting Assembly

4.7 COMPRESSOR REASSEMBLY

To clean compressor parts, use a suitable solventwith proper precautions. Coat all moving parts with compressor oil before assembly. Refer to Table 4-2, for applicable compressor torque values.

a. Suction and Discharge Valves

If the valve seats look damaged or worn, replace valve plate assembly. Always use new valves because it is difficult to reinstall used discharge valves so that they will seat as before removal. Any valve wearwill cause leakage for this reason.

Suction valves are positioned by dowel pins (see Figure 4-12) and will assume their original positionwhen reinstalled. No two valves are likely to wear exactly the same. Never interchange used valves.

Do not omit the suction valve positioning springs. (See Figure 4-12.) Place the springs so that the ends bear

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against the cylinder deck (middle bowed away from cylinder deck). Use new gaskets when reinstalling valve plates and cylinder heads.

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3

1. Suction Valve 2. Suction Valve Positioning Spring 3. Valve Plate Dowel Pin

Figure 4-12. Suction Valve & Positioning Springs

b. Compression Rings

1. Depending on date of manufacture, the compressor may be equipped with double or single ring pistons. This variation may also exist with replacement piston assemblies. If double ring pistons and ring sets are to be installed, both compression rings must be installed. Also, double ring and single ring pistons may be installed in the compressor.

2. The compression ring is chamfered on the inside circumference. This ring is installed with the chamfer towards the top. If using a double ring piston, stagger the ring end gaps so they are not aligned.

The gap between the ends of the piston rings can be checked with a feeler gauge by inserting the ring into the piston bore about one inch below the top of the bore. Square the ring in the bore by pushing it slightly with a piston. The maximum and minimum allowable ring gaps are 0.33 and 0.127 mm (0.013 and 0.005 inch)

Compression ring Figure 4-13. Piston Rings

c. Installing the Components

1. Install the crankshaft through the pump end of the compressor. Do not damage main bearings. Push pistons from the inside of the crankcase through the cylinders being careful not to break the rings. Place chamfered side of connecting rod against radius of crankpins. Install matching connecting rod caps through bottom cover plate.

2. The oil screen (located in the bottom of the crankcase), is connected to the inlet of the oil pump. Whenever the compressor crankcase is opened, inspect the screen for holes or an accumulation of dirt. The screen can be cleaned with a suitable solvent.

There are two types of oil pumps; vane and gear. See Figure 4-3 to identify which oil pump is used, then follow the correct procedure below.

Vane Oil Pump (See Figure 4-6):

a. Install the bearing head assembly with a new gasket on the compressor crankshaft. Carefully push oil pump on by hand ensuring that the bearing head mounts flush to the crankcase body. The top of the bearing head is marked on the mounting flange.

b. Align the gasket and install the eight capscrews in the mounting flange.

c. Install the drive segment with the two capscrews and lock washer.

d. Insert the oil feed guide with the large diameter in. Insert the guide retaining spring so that it fits over the smaller diameter of the feed guide. The pump cover can now be installed.

e. Place the pump cover, with a new gasket, over the guide retaining spring and compress the spring to enable installation of the cover capscrews.

Gear Oil Pump (See Figure 4-7):

a. Install the pump end thrust washer on the two dowel pins located on the bearing head.

CAUTION Ensure that the thrust washer does not fall off the dowel pins while installing the oil pump.

b. Install the bearing head assembly with a new gasket on the compressor crankshaft. Carefully push the oil pumpon by hand ensuring that the thrust washer remains on the dowel pins, the tang on the end of the drive segment engages the slot in the crankshaft, and the oil inlet port on the pump is aligned with the oil pickup tube in the crankcase. The pump should mount flush with the crankcase.

c. Align the gasket and install the eight capscrews in the mounting flange.

3. Install rotor with key. Screw on equalizer tube and lock screw assembly with lock washer and bend over tabs of lock washer. Assemble suction strainer to motor and cover and bolt cover to crankcase. Assemble valve plates and gaskets. Assemble cylinder heads and gaskets. Feel if the shaft will turn by hand.

4. Install oil suction screen and bottom plate.

4.8 CHECKING THE COMPRESSOR OIL LEVEL

a. To Check the Oil Level in the Compressor:

1. Operate the unit in six cylinder cooling for at least 20 minutes.

2. Check the front oil sight glass on the compressor to ensure that no foaming of the oil is present after 20 minutes of operation. If the oil is foaming excessively after 20 minutes of operation, check the refrigerant system for flood-back of liquid refrigerant. Correct this situation before performing step a.3.

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3. Turn unit off and the correct oil level should be between 1/4 and 1/2 of the sight glass. If the level is above 1/2, oilmust be removed from the compressor. To remove oil fromthe compressor, followstep d. If the level is below 1/8, add oil to the compressor following step b. below.

b. Adding Oil with Compressor in System

Twomethods for adding oil are the oil pumpmethod and closed system method.

Oil Pump Method:

One compressor oil pump that may be purchased is a Robinair, part no. 14388. This oil pump adapts to a 3.785 liters (one U.S. gallon) metal refrigeration oil container and pumps 0.0725 liters (3.5 ounces) per stroke when connected to the suction service valve port. Also there is no need to remove pump from can after each use.

When the compressor is in operation, the pump check valve prevents the loss of refrigerant, while allowing servicemen to develop sufficient pressure to overcome the operating suction pressure to add oil as necessary.

Backseat suction service valve and connect oil charging hose to port. Crack the service valve and purge the oil hose at the oil pump. Add oil as necessary.

Closed System Method:

In an emergency where an oil pump is not available, oilmay be drawn into the compressor through the suction service valve.

CAUTION Extreme care must be taken to ensure the manifold common connection remains immersed in oil at all times. Otherwise air and moisture will be drawn into the compressor.

Connect the suction connection of the gauge manifold to the compressor suction service valve port, and immerse the common connection of the gauge manifold in an open container of refrigeration oil. Crack the suction service valve and gauge valve to vent a small amount of refrigerant through the common connection and the oil to purge the lines of air. Close the gauge manifold valve.

With the unit running, frontseat the suction service valve and pull a vacuum in the compressor crankcase. SLOWLY crack the suction gauge manifold valve and oil will flow through the suction service valve into the compressor. Add oil as necessary.

Run unit for 20 minutes, in cooling, and check oil level.

c. Adding Oil to Service Replacement Compressor NOTE

The correct oil charge is 4.0 liters (8.5 U.S. pints)

Service replacement compressors may ormay not be shipped with oil.

If compressor is without oil:

Add oil, (sections 1.3.b and 4.8.b.) through the suction service valve flange cavity or by removing the oil

fill plug. (See Figure 4-2.) Some compressorshave theoil plug located on the crankcase, at the right or left side of the oil pump.

d. To Remove Oil From an 06DR Compressor: 1. If the oil level recorded in step a.3 is above 1/2 of

the sight glass, oil must be removed from the compressor.

2. Close (frontseat) suction service valve and pump unit down to 1.2 to 1.3 kg/cm@ (2 to 4 psig). Frontseat discharge service valve and slowly bleed remaining refrigerant.

3. Remove the oil drain plug on the bottom plate of the compressor and drain the proper amount of oil from the compressor to obtain the 1/2 sight glass maximum level.Replace the plug securely back into the compressor. DO NOT FORGET TO OPEN SUCTION AND DISCHARGE SERVICE VALVES.

4. Repeat Step a. to ensure proper oil level.

4.9 CHECKING OR REPLACING MOISTURE-LIQUID INDICATOR

When the refrigeration system is operating, the moisture-liquid indicator provides an indication of moisture in the system.

The indicator element is highly sensitive to moisture and will gradually change color in direct relation to an increase or decrease in the moisture content of the system. The safe, caution, and unsafe system operating conditions are then easily determined by matching the element color with the colors displayed on the reference label.

To change indicator or lens:

a. Pump down the unit per section 4.1 and install new indicator or lens.

b. Evacuate the unit per section 4.3 and add refrigerant charge per section 4.4.

c. Start unit and after twelve hours re-check indicator. If indicator does not indicate a safe condition, pumpunit down and change filter-drier. (Refer to section 4.10.)

4.10 CHECKING OR REPLACING THE FILTER-DRIER

If the sight glass appears to be flashing or bubbles are constantly moving through the sight glass, the unit may have a low refrigerant charge, or the filter-drier could be partially plugged.

To Check Filter-Drier:

a. One test for a restricted or plugged filter-drier is by feeling the liquid line inlet and outlet connections of the drier cartridge. If the outlet side feels cooler than the inlet side, then the filter-drier should be changed.

b. Another test is that the moisture-liquid indicator shows moisture in the system. (Refer to section 4.9)

To Replace Filter-Drier: a. Store the refrigerant in an evacuated container and replace filter-drier. (Refer to section 4.1)

b. Evacuate the unit per section 4.3 and charge unit with refrigerant per section 4.4.1.

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c. After unit is in operation, inspect for moisture in system. (Refer to section 4.9.)

4.11 CHECKING OR REPLACING HIGH PRESSURE SWITCH

4.11.1 Replacing High Pressure Switch

a. Store the refrigerant in an evacuated container (Refer to Section 4.3.3). Frontseat both suction and discharge service valves to isolate compressor.

b. Disconnect wiring from defective switch. The high pressure switch is located on the center head and is removed by turning counterclockwise. (See Figure 1-1.)

c. Install new cutout switch after verifying switch settings. (Refer to section 4.11.2.)

d. Evacuate and dehydrate the compressor per section 4.5.1.o through 4.5.1.t.

4.11.2 Checking High Pressure Switch WARNING

Do not use a nitrogen cylinder without a pressure regulator. Do not use oxygen in or near a refrigeration system as an explosion may occur.

NOTE The high pressure switch (HPS) is non-adjustable.

a. Remove switch as outlined in section 4.11.1.a through c.

b. Connect ohmmeter or continuity light across switch terminals. Ohm meter will indicate resistance and continuity light will be illuminated if switch closed after relieving compressor pressure.

c. Connect capillary to a cylinder of dry nitrogen. (See Figure 4-14.)

1. Cylinder Valve and Gauge

2. Pressure Regulator 3. Nitrogen Cylinder 4. Pressure Gauge

(0 to 36 kg/cm@ = 0 to 400 psig)

5. Bleed-Off Valve 6. 1/4 inch Connection

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Figure 4-14. Typical Setup for Testing High Pressure Switch

d. Set nitrogen pressure regulator at 21 kg/cm@ (300 psig) with bleed-off valve closed.

e. Close valve on cylinder and open bleed-off valve.

f. Open cylinder valve. Slowly close bleed-off valve to increase pressure on switch. The switch will open at a static pressure up to 21 kg/cm@ (295 psig). If light is used, light will go out and if ohmmeter is used, the meter will indicate open.

g. Slowly open bleed-off valve to decrease the pressure. The switch will close at 13 kg/cm@ (190 psig).

4.12 SERVICING QUENCH SOLENOID VALVE (QV) NOTE

This section is NOT APPLICABLE to models having a thermostatic expansion quench valve. To see which Models have a solenoid quench valve refer to Section 5.

Replacing Solenoid Valve Coil

The coil may be removed without removing the refrigerant.

Remove screw, lockwasher and coil. Disconnect leads and remove coil. Verify new coil type, voltage and frequency. (This information appears on the coil housing.) Place new coil on valve stem and secure same.

4.13 REPLACING THE EVAPORATOR COIL AND HEATER ASSEMBLY

The evaporator section, including the coil, should be cleaned with fresh water or steam, preferably. Another recommendation is to use Oakite 202 or similar cleaner following manufacturers instructions.

The two drain pan hoses connected to the drain pan, are routed behind the condenser fan motor and compressor. Thedrainpan line(s)must beopen toensure adequate drainage.

To Replace Evaporator Coil: a. Store the refrigerant charge in an evacuated container by attaching a line to the liquid line valve. (See Figure 1-3 and refer to section 4.1)

b. With power OFF and power plug removed, remove the screws securing the panel covering the evaporator section (upper panel).

c. Disconnect the defrost heater wiring.

d. Disconnect the klixon from the coil. The defrost termination thermostat (DTT) is located on the middle coil support as shown in Figure 1-2.

e. Remove middle coil support.

f. Remove the mounting hardware from the coil.

g. Unsolder the two coil connections, one at the distributor and the other at the coil header.

NOTE Itmay be necessary to raise the fan deck to break the solder connections (to raise coil).

h. After defective coil is removed from unit, remove defrost heaters and install on replacement coil.

i. Install coil assembly by reversing above steps.

j. Leak check connections per section 4.2. Evacuate the unit per section 4.3 and add refrigerant charge per section 4.4.2.

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4.14 REPLACING THE EVAPORATOR FAN AND MOTOR ASSEMBLY

The evaporator fans circulate air throughout the container by pulling air in the top of the unit. The air is discharged through the evaporator coil where it is either heated or cooled and then discharged out the bottom of the refrigeration unit into the container. (Refer to section 1.4.f.) The fan motor bearings are factory lubricated and do not require additional grease.

WARNING Always turnOFF the unit circuit breakers (CB-1 & CB-2) and disconnect main power supply before working on moving parts.

a. Remove upper access panel (See Figure 1-1) by removing mounting bolts and T.I.R. locking device. Reach inside of unit and remove Ty-Rap securing wire harness loop.

b. Remove the two lowermounting bolts that secure the motor-fan assembly to the unit. Loosen the two upper bolts as the motor mount upper holes are slotted.

c. Remove motor, fan, and wiring from unit. Place fan motor and fan on a support. Remove the wiring and fan.

d. Lubricate fan motor shaft with a graphite-oil solution (Never-Seez). Apply thread sealer (Loctite H, brown in color) to the two fan set screws. Install fan on motor. The evaporator fan locating dimension is shown in Figure 4-15.

10.79 CM (4.25 INCHES)

Figure 4-15. Evaporator Fan Locating Dimension

e. Connect wiring per applicable wiring diagram and install motor and fan assembly in unit. Apply power, momentarily, to check fan rotation. (Refer to section 1.4.f.) If fan spins backwards, refer to section 4.27 for two-speed motors.

Replace access panel, making sure panel does not leak. Make sure T.I.R. locking device is lockwired.

4.15 SERVICING THE EVAPORATOR COIL HEATERS

WARNING Before servicing unit, make sure the unit circuit breakers (CB-1) and the start-stop switch are in the OFF position. Also disconnect power plug and cable.

a. Remove the lower access panel (Figure 1-1) by removing the T.I.R. locking device lockwire and mounting screws.

b. Determine which heater(s) need replacing by checking resistance on each heater as shown in section 1.4.e.

c. Remove hold-down clamp securing heaters to coil.

d. Lift the U portion of the heater (with opposite end down and away from coil). Move heater left (or right) enough to clear the heater end support.

4.16 CONDENSER COIL The condenser consists of a series of parallel copper

tubes expanded into copper or aluminum fins. The condenser coilmust be cleanedwith freshwater or steam, so the air flow is not restricted. Fan rotation is counterclockwise when viewed from shaft end of motor.

WARNING Do not open the condenser fan grille before turning powerOFF anddisconnecting power plug.

To Replace Condenser Coil: a. Store the refrigerant charge in an evacuated container by attaching a line to the liquid line valve. (See Figure 1-3 and refer to section 4.1)

b. Remove the condenser coil guard.

c. Unsolder discharge line and remove the line to the water-cooled condenser (if so equipped).

d. Remove coil mounting hardware and then remove the coil.

e. Install replacement coil and solder connections.

f. Leak check the coil per section 4.2. Evacuate theunit per section 4.3 and then, charge the unit with refrigerant per section 4.4.1.

4.17 CONDENSER FAN AND MOTOR ASSEMBLY

WARNING Do not open condenser fan grille before turning power OFF and disconnecting power plug.

NOTE The replacement motor should be degreased and sprayed with a coat of Tectyl before installing in unit.

The condenser fan rotates counterclockwise (viewed from front of unit) and pulls air through the the condenser coil and discharges horizontally through the front of the unit.

a. Open condenser fan screen guard.

b. Loosen square head set screws (2) on fan. (Thread sealer has been applied to set screws at installation.) Then disconnect wiring from motor junction box.

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CAUTION Take necessary steps (place plywood over coil or use slingonmotor) to preventmotor from falling into condenser coil.

c. Remove motor mounting hardware and replace the motor. It is recommended that new locknuts be used when replacing motor. Connect wiring per wiring diagram.

d. Install fan loosely onmotor shaft (hub side in). Install venturi. Apply Loctite H to fan set screws. Adjust fan within venturi so that the outer edge of the fan projects (7.9 mm = 5/16) out from edge of venturi. Spin fan by hand to check clearance.

e. Close and secure condenser fan screen guard.

f. Apply power to unit and check fan rotation. If fan motor rotates backwards, reverse wires 5 and 8.

4.18 RECORDING THERMOMETER (PARTLOW)

CAUTION The inside mechanism of the control, particularly the inside of the element housing should never be oiled, however, control mechanisms should be sprayed periodically (every 60 days) with corrosion inhibiting CRC 3-36a or 6-66 or LPS no. 2.

3

4

1

2

5

1. Wind-up Key 2. Stylus 3. Set Screw

4. Pinion Shaft 5. Stylus Lifter

Figure 4-16. Partlow Recording Thermometer

a. Instruments for Checking Bulb Temperature The recording thermometer may be equipped with

one or two Simpson accessories (#344 units), each consisting of a thermistor probe and receptacle

(mounted to instrument case.) Single probe is attached to the element (bulb) capillary which senses the container return air temperature. If using two probes, the other probe is attached to the supply air temperature sensor.

In the event of a failure with the#344 test lead, other instruments for checking bulb temperatures are:

SimpsonMeter, CTCP/N 07-00013 or Robinair Thermistor Temperature Tester, Model 12860:

A resistance thermometer with RCA lead and a phono-plug at each end may be used to compare bulb temperature and stylus indicated temperature on chart by inserting one end of the lead into receptacle provided on the controller and other end in the meter. Always check resistance thermometer before using. (Refer to para. b.)

Ohmmeter:

1. Place one probe of ohmmeter in the middle of the receptacle provided on the chart platen, Figure 4-16, and ground other probe to unit.

2. Note reading of meter and using Table 4-3, convert resistance to temperature.

b. Checking Resistance Thermometer

Calibrate the resistance thermometer by completely filling a thermos container full of ice cubes or chips and filling the voids between the ice with plain water. Stir the solution until the mixture registers 0 to 0.3_C (32 to 32.5_F), as indicated by a laboratory thermometer. Immerse the resistance thermometer in the 0_C (32_F) solution and check its accuracy at this temperature. With this instrument, be certain that the recommended length of the check probe is immersed so that it accurately will reflect temperature. Bear inmind that thismeasurement checks the test probe at 0_C (32_F) only; it is possible for this type of instrument to be inaccurate at other temperatures. Rezero check thermometer, if necessary, by manufacturers instructions.

c. Checking the Recording Thermometer Bulb Temperature

Checking temperature is accomplished by comparing the instruments indicated temperature (stylus) with the known temperature existing at the element sensing bulb. To properly check the temperature of the recorder, the element sensing bulb should be stabilized at a temperature of 0_C (32_F). This is accomplished by using one of the two followingmethods, whichever is more convenient.

Unit Running:

Place set point at 0_C (32_F). After unit has pulled down to this temperature, allow the compressor to cycle ON-OFF 3 to 5 times to be certain temperature has stabilized at 0_C (32_F) as verified by the resistance thermometer. If the temperature indicated by the thermometer differs from 0_C (32_F) by more than 0.6_C (1_F) when compressor cycles off, rezeroing must be performed.

Unit Off:

Place the recording thermometer element (sensing bulb) in 0_C (32_F) ice-water bath. Ice-water bath is

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prepared by filling an insulated container (of sufficient size to completely immerse bulb) with ice cubes or chipped ice, then filling voids between ice withwater, and agitating until mixture reaches 0_C (32_F) as shown by a laboratory thermometer.

When the temperature at the element sensing bulb has stabilized at 0_C (32_F), as indicated by stable stylus indication, compare temperature indicated by stylus with temperature shown by a laboratory thermometer. If the two readings do not agree, the recording thermometer should be rezeroed. (Refer to paragraph d.)

d. Rezeroing the Recording Thermometer

1. Be certain that the element bulb temperature has stabilized at 0_C (32_F). Note the amount of temperature difference between the test meter or thermometer reading and the stylus indicated temperature.

If the difference noted between the known element temperature and indicated temperature is within acceptable limits (0.3 of 0_C = 1/2_ of 32_F), do not attempt to rezero. If more than 0.3_C (1/2_F) in variation, carefully note the number of degrees.

2. If recording thermometer is found to require rezeroing:

(a) Loosen set screw, item 3, Figure 4-16 and zero thermometer by turning pinion shaft, item 4. Lengthening pinion shaft (counterclockwise) raises stylus indicated temperature reading: shortening shaft (clockwise) lowers stylus reading. Then retighten set screw.

(b) Reset control at 0_C (32_F), start the refrigeration unit and repeat accuracy check. After temperature stabilization, recording thermometer should be within 0.3_C (1/2_F) limits.

e. Replacing Recording Thermometer Element (Bulb and Capillary)

The element is mercury-filled and the temperature-pressure of the element controls the stylus which moves across the chart in response to temperature changes as sensed by the bulb located in the evaporator supply air.

The element flange contains three O-rings. Care should be taken to install the newelement flangewithout damaging the O-rings. It is possible for a mercury leak to develop at the flange if O-ring damage occurs.

The stylus will continue to fall (container temperature will actually be higher) if a leak develops in the flange, capillary or bulb.

To replace the recording thermometer element:

1. Turn unit OFF and disconnect power source.

2. Remove upper back panel. Remove bulb clamps securing bulb to unit.

3. Remove two flange screws from recording thermometer and feed capillary and element through the unit.

4. Push replacement bulb end and capillary through the unit.

5. Fill slots with silastic (RTV432, Dow Corning).

6. Attach bulb clamps tightly to bulb.

7. Connect element flange to recordermaking sure hub of flange faces out to fit into the hole in instrument case (recording thermometer).

8. Rezero the recorder. (Refer to sections 4.18.a. through 4.18.d.)

9. Install inlet air grille and upper panel. Start unit and check recorder calibration.

CAUTION

Capillary tubingmay be bent, but never sharper than 1/2 radius: extra care should be taken when bending adjacent to welds. The sensing bulb should never be bent, as this will affect calibration.

4.19 RECORDING THERMOMETER (SAGINOMIYA)

NOTE Do not overtighten chart nut after replacing chart.

a. Battery

1. Open door and remove chart nut and platen.

2. Push voltage indicator test switch, item 2, Figure 4-17. Replace battery if voltage indicator points to the red or white zone.

b. Calibration

1. Install new chart on platen.

2. Place recorder bulb in ice bath (0 0.2_C = 32 0.35_F). (Remove rear upper panel to remove bulb.) Leave bulb immersed in ice bath for 10 minutes.

3. After 10 minutes, rotate the chart by hand and check the stylus indicated temperature. Do not touch stylus during the checkout procedure.

4. If adjustment is required, loosen setscrew (cross-recessed head). Using a 7 mm wrench, rotate the adjustment screw clockwise to set the stylus 1 to 2_C (1.8 to 3.6_F) higher than desired temperature.

5. Rotate the adjustment screw counterclockwise to set the stylus about 0.5_C (0.9_F) higher than set temperature. Rotate the chart by hand. The indicated temperature should be 0_C (32_F).

NOTES

1.) One full turn with the adjustment screw changes the indicated temperature by approximately 5_C (9_F). 2.) Overtightening of setscrew may change set temperature. 3.) Calibration should only be done when bulb temperature is decreasing. 4.) DO NOT move stylus by hand.

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c. Replacing Sensor Probe

1. Remove box from unit.

2. Remove nut and bushing, item 9, Figure 4-17.

3. Install replacement probe andbushing. Sealwith silicone before securing to case.

4. Install box into unit.

1. Voltage Indicator 2. Indicator Test Switch 3. Battery (C size, Alkaline) 4. Sensor Assembly 5. Stylus 6. Stylus Lifter 7. Setscrew (Adjustment) 8. Bulb and Mechanism 9. Bushing and Nut

1

2

3

4

9

5

6

7

8

Figure 4-17. Saginomiya Recording Thermometer

4.20 RUSTPREVENTIONANDMAINTENANCEOF PAINTED SURFACES

a. Rust Prevention --- Components To prevent corrosion, external parts such as

compressor, cable clamps, fasteners, and evaporator fan motor, should be sprayed with clear urethane (CRC Chemicals, Part No. 2-53) every six months. The inside of the control panel should be sprayed (CRC Chemicals, Part No. 3-36) at similar time periods.

b. Maintenance of Painted Surfaces

The refrigeration unit is protected by a special paint system against the corrosive atmosphere in which it normally operates. However, should the paint system be damaged, the base metal can corrode. In order to protect the refrigeration unit from the highly corrosive sea atmosphere or if the protective paint system is scratched or damaged, clean area to bare metal using a wire brush, emery paper or equivalent cleaning method. Immediately following cleaning, spray or brush on zinc

rich primer. After the primer has dried, spray or brush on finish coat of paint to match original unit color.

4.21 SERVICING THE WATER-COOLED CONDENSER

NOTE

WhenOakite compoundNo. 32 is being used for the first time, the local Oakite Technical Service representative should be called in for their suggestions in planning the procedure. They will show you how to do the work with a minimum dismantling of equipment: how to estimate the time and amount of compound required; how to prepare the solution; how to control and conclude the de-scaling operation by rinsing and neutralizing equipment before putting it back into service. Their knowledge of metals, types of scale, water conditions and de-scaling techniques will be invaluable to you.

The water-cooled condenser is of the shell and coil type with circulating water through the cupro-nickel coil. The refrigerant vapor is admitted to the shell side and is condensed on the outer surface of the coil.

Rust, scale and slime on the water-cooling surfaces inside of the coil interfere with the transfer of heat, reduce system capacity, cause higher head pressures and increase the load on the system.

By checking the leaving water temperature and the actual condensing temperature, it can be determined if the condenser coil is becoming dirty. A larger than normal difference between leaving condensing water temperature and actual condensing temperature, coupled with a small difference in temperature of entering and leaving condensingwater, is an indicationof a dirty condensing coil.

To find the approximate condensing temperature, with the unit running in the cooling mode, install a gauge 0 to 36.2 kg/cm@ (0 to 500 psig) on the compressor discharge service valve.

For example: if the discharge pressure is 10.3 kg/cm@ (147 psig), and referring to Table 4-6, R-12 pressure-temperature chart, the 10.3 kg/cm@ (147 psig) converts to 46_C (115_F).

If the water-cooled condenser is dirty, it may be cleaned and de-scaled by the following procedure:

a. Turn unit off and disconnect main power.

b. Disconnect water pressure switch tubing by loosening the two flare nuts. Install 1/4 inch flare cap on water-cooled condenser inlet tube (replaces tubing flare nut). De-scale tubing if necessary.

What You Will Need:

1. Oakite composition No. 22, available as a powder in 68 kg (150 lb) and 136 kg (300 lb).

2. Oakite composition No. 32, available as a liquid in cases, each containing 3.785 liters (4 U.S. gallon) bottles and also in carboys of 52.6 kg (116 lbs) net.

3. Fresh clean water.

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4. Acid proof pump and containers, or bottles with rubber hose.

What You Will Do --- (Summary):

1. Drain water from condenser tubing circuit. Clean water tubeswithOakiteNo. 22 to removemud and slime.

2. Flush.

3. De-scale water tubes with Oakite No. 32 to remove scale.

4. Flush.

5. Neutralize.

6. Flush.

7. Put unit back in service under normal load and check head (discharge) pressure.

Detailed Procedure:

1. Drain and flush the water circuit of the condenser coil. If scale on the tube inner surfaces is accompanied by slime, a thorough cleaning is necessary before de-scaling process can be accomplished.

2. To remove slime or mud, use Oakite composition No. 22, mixed 170 grams (6 ounces) per 3.785 liters (1 U.S. gallon) of water. Warm this solution and circulate through the tubes until all slime and mud has been removed.

3. After cleaning, flush tubes thoroughly with fresh clean water.

4. Prepare a 15% by volume solution for de-scaling, by diluting Oakite compound No. 32 with water. This is accomplished by slowly adding 0.47 liter (1 U.S. pint) of the acid (Oakite No. 32) to 2.8 liters (3 U.S. quarts) of water.

WARNING Oakite No. 32 is an acid --- therefore be sure that the acid is slowly added to the water. DO NOT PUT WATER INTO THE ACID! --- this will cause spattering and excessive heat.

Wear rubber gloves and wash the solution from the skin immediately if accidental contact occurs. Do not allow the solution to splash onto concrete.

5. Fill the tubes with this solution by filling from the bottom. See Figure 4-18A. Important: --- be sure to provide a vent at the top for escaping gas.

6. Allow the Oakite No. 32 solution to soak in the tube coils for several hours, periodically pump-circulating it with an acid-proof pump.

An alternate method may be used, whereby a bottle (See Figure 4-18B) filled with the solution and attached to the coils by a hose can serve the same purpose, by raising and lowering of the bottle. The solution must contact the scale at every point for thorough de-scaling, therefore ensure that no air pockets exist, by regularly opening the vent to release gas. Keep flames away from the vent gases.

Fill condenser with cleaning solution. Do not add solution more rapidly than vent can exhaust gases caused by chemical action.

Centrifugal pump 30 GPM at 35 head

Pump

Suction

Pump support

Tank

Fine mesh screen

Return

Remove water regulating valve

Condenser

Globe valves

Gas vent

Close vent pipe valve when pump is running.Priming

connection

A --- Forced Circulation

Condenser

Vent pipe

1 Pipe

5 Approximate

3 to 4

B --- Gravity Circulation

Figure 4-18. Water-Cooled Condenser Cleaning

7. The time required for de-scalingwill vary, depending upon the extent of the deposits. One way to determine when de-scaling has been completed is to titrate the solution periodically, using titrating equipment provided free by the Oakite Technical Service representative. As scale is being dissolved, titrate readings will indicate that the Oakite No. 32 solution is losing strength. When the reading remains constant for a reasonable time, this is an indication that scale has been dissolved.

8. When de-scaling is complete, drain the solution and flush thoroughly with water.

9. Next circulate a 56.7 gram (2 ounce) per 3.785 liter (1 U.S. gallon) solution of Oakite No. 22 thru the tubes to neutralize. Drain this solution.

10. Flush the tubes thoroughly with fresh water.

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NOTE If the condenser cooling water is not being used as drinking water or is not re-circulated in a closed or tower system, neutralizing is not necessary.

11. Put the unit back in service and operate under normal load. Check the head pressure. If normal, a thorough de-scaling has been achieved.

What You Can Do For Further Help:

Contact the Engineering and Service Department of the OAKITE PRODUCTS CO., 19 Rector Street, New York, NY 10006 U.S.A. for the name and address of the service representative in your area.

4.22 CHECKOUT PROCEDURE FOR OPTIONAL POWER TRANSFORMER

If the unit does not startwhen connected to a 190/230 vac power supply, check the following:

a. Make sure circuit breaker (CB-2) is in the ON position. If CB-2 does not hold in, check voltage supply.

b. Check to see if the transformer internal protector (IP-AUTO-TRANS) is closed. Allow a reasonable length of time for transformer to cool down. The transformer includes two (2) internal protectors. Only one is wired into the system as the second protector is a spare.

c. To Check for Continuity Across the Internal Protector (IP-AUTO-TRANS):

1. Turn power OFF and disconnect power source.

2. Disconnect white wires 1 and 2 from terminal board.

3. Check for continuity across the internal protector (IP). If (IP) is open and will not reset, connect wires 3 and 4 (18 gauge) to terminal board.Check to see if unit will start.

d. If the internal protector and circuit breakers (CB-1 and CB-2) are good, check the transformer. Use a voltmeter and with the primary supply circuit ON check the primary (input) voltage (230 vac). Next, check the secondary (output) voltage (460 vac) at the voltage selector switch. The transformer is defective if voltage is not available.

4.23 TEMPERATURE CONTROLLER AND RECORDER SENSOR CHECKOUT PROCEDURE

a. Place the sensor (sensing bulb) in 0_C (32_F) ice-water bath. Ice-water bath is prepared by filling an insulated container (of sufficient size to completely immerse bulb) with ice cubes or chipped ice, then filling voids between ice with water, and agitating until mixture reaches 0_C (32_F) as shown by a laboratory thermometer.

b. Start unit and check air temperature/data readout on the microprocessor control panel. You should have a reading of 0_C (32_F); if not, continue on to the following step.

c. Turn unit OFF and disconnect power supply.

d. Remove two capscrews and lower the Microprocessor Control Panel.

e. Remove three screws and loosen three other screws to remove cover (Item 3, Figure 4-26).

f. In the box there are wires marked supply and return. Follow the wire to the plug connector and using the pins of the plug, measure the ohms resistance. Readings are shown in Table 4-4.

4.23.1 Replacing Temperature Sensor

a. Turn unit power OFF and disconnect power supply.

b. Cut cable 2 inches from shoulder of defective sensor and discard defective probe.

c. Cut one wire of existing cable 41mm (1-5/8) shorter than the other wire. (See Figure 4-19.)

SENSOR

SHOULDER

41mm (1-5/8)

6.35mm (1/4) Figure 4-19. Sensor

d. Cut one replacement sensor wire (opposite color) back 41 mm (1-5/8).

e. Strip back insulation on all wiring 6.35mm (1/4).

CAUTION Donotallowmoisture to enter wire splice area as this may affect the sensor resistance.

f. Slide a large piece of heat shrink tubing over the cable and the two small pieces of heat shrink tubing over the wires before adding crimp fittings as shown in Figure 4-20.

g. Slip crimp fittings over dressed wires (keep wire colors together). Make sure wires are pushed into crimp fittings as far as possible and crimp with crimping tool.

h. Solder spliced wires with a 60% tin and 40% lead Rosincore solder.

i. Slide heat shrink tubing over splice so that both ends of tubing cover both ends of crimp as shown in Figure 4-20.

SENSOR

CABLE HEAT SHRINK TUBING (2)

LARGE HEAT SHRINK TUBING (1)

Figure 4-20. Sensor and Cable Assembly

j. Heat tubing, preferably with a flameless heat gun. If not available, a propane torch will work (caution should be taken not to burn the heat shrink tubing or wire

4-16

insulation).Make sure all seams are sealed tightly against the wiring to prevent moisture seepage.

k. Slide large heat shrink tubing over both splices and shrink tubing and heat as in step j.

l. Secure sensor to unit and check sensor resistance as detailed in section 4.23.

4.24 SERVICING SUCTION SOLENOID VALVE (69NT40 ONLY)

a. Replacing the Coil

NOTE The coil may be replaced without removing the refrigerant.

1. Disconnect leads. Remove snap cap or locknut. Lift off coil. (See Figure 4-21 or Figure 4-22)

2. Verify coil type, voltage and frequencyof old and new coil. This information appears on the coil housing.

b. Replacing Valve Internal Parts --- Sporlan (See Figure 4-21)

1

2

3

5

6

7

4

SPORLAN

8

9

1. Locknut 2. Nameplate 3. Coil 4. Locknut 5. Enclosing Tube

6. Gasket 7. Stem and Plunger 8. Seat Disc 9. Body

Figure 4-21 Suction Solenoid Valves --- Sporlan

1. Remove and store the refrigerant charge in an evacuated container. (Refer to section 4.1)

2. Remove the top locknut, nameplate and coil assembly.

3. Using a 12 point, 1-3/8 inch box wrench, loosen the enclosing tube locknut and bleed off remaining refrigerant.

4. Remove enclosing tube and locknut assembly. The gasket is inside the enclosing tube.

5. Remove seat disc from inside of body and check for obstructions and foreign material.

6. Place the seat disc into the valve body with the smaller diameter end facing up.

7. Install stem and plunger (item 7, Figure 4-21).

8. Place the enclosing tube locknut over the enclosing tube. Install spacer over enclosing tubemaking sure it is seated properly in the enclosing tube locknut. Tighten enclosing tube locknut to a torque value of 2.78 mkg (20 ft-lb). Do not overtighten.

9. Install coil assembly, nameplate and top locknut.

10. Dehydrate and evacuate the system. (Refer to section 4.3) Charge unit with refrigerant per section 4.4.

11. Start unit and check operation.

c. Replacing Valve Internal Parts --- Alco (See Figure 4-22)

ALCO

10

11

12 13 14 15

1

2

5 6

7

4

8 9

16

3

1. Snap Cap 2. Coil 3. Installation/

Removal Tool 4. Enclosing Tube Collar 5. O-Ring 6. Enclosing Tube 7. Spring 8. Plunger

9. Gasket 10. Top Plate 11. Capscrews 12. Spring 13. Gasket 14. Diaphragm 15. O-Ring 16. Body

Figure 4-22 Suction Solenoid Valves --- Alco

1. Remove and store the refrigerant charge in an evacuated container. (Refer to section 4.1)

2. Remove snap cap, and coil.

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3. Remove enclosing tube collar (item 4, Figure 4-22) using installation/removal tool supplied with repair kit (item 3).

4. Check plunger for restriction due to: (a) Corroded or worn parts; (b) Foreign material lodged in valve; (c) Bent or dented enclosing tube.

5. Remove top plate, diaphragm spring, diaphragm and body gaskets.

6. Install new parts, assemble in reverse order of disassembly.

7. Torque the 4 capscrews to 40 inch pounds.

8. Do not overtighten enclosing tube assembly. Torque to a value of 1.15 mkg (100 inch pounds).

9. Remove supplied installation/removal tool. Install coil, and snap cap.

10. Dehydrate and evacuate the system. (Refer to section 4.3) Charge unit with refrigerant per section 4.4.

11. Start unit and check operation.

4.25 SERVICING THE MODULATING SOLENOID VALVE

NOTE

When repairing modulating valve with the enclosing tube kit (CTD P/N 14-50021-01) be sure not to remove items 7, 8 & 10. (See Figure 4-23) Proper alignment of these items is achieved only at the factory.

a. Coil Checkout Procedure

WARNING

Make sure power to the unit is OFF and power plug disconnected before replacing the coil.

1. Disconnect the modulation valve coil wires from their terminal locations (Refer to section 5).

2. Using a reliable digital ohmmeter, test each leads resistance to ground. If the resistance indicates a ground short is present, inspect the length of wiring for damaged or exposed wires. Replace where necessary.

3. Setting the digital ohmmeter for low range check coils resistance. If coils resistance is below 5 ohms it is recommended to be replaced. New coils have an approximate resistance of 7.6 ohms at 25_C (77_ F). The chart below gives the resistance of a new coil at various ambient temperatures.

Ambient Temperature Cold Coil 10_ F 6.45 ohms 40_ F 6.90 ohms 70_ F 7.40 ohms 100_ F 7.90 ohms

NOTE A cold coil is a coil which had not been operating and is assumed to be at ambient temperature. Hot coil temperatures, taken after the unit has been operating in deep modulation for a long period of time, may give higher resistance readings.

4. Reconnect the modulation valve coil wires to their correct terminal locations.

1

2

3

4

5

6

7

8

9

10 11

1. Coil Nut 2. Coil Nut O-ring 3. Coil Housing 4. Solenoid Coil

Sleeve 5. Solenoid Coil 6. Enclosing Tube

Assembly

7. Piston 8. Top Return Spring 9. Valve Body 10. Bottom Return

Spring 11. Filter

Figure 4-23. Modulating Solenoid Valve

b. Replacing the Coil Remove locking nut and remove coil after

disconnecting wiring. When replacing nut, torque to a value of 0.41 mkg (3 ft-lb).

c. To Replace Valve

1. Store the refrigerant in an evacuated container.

2. Remove two bolts from suction service valve.

3. Melt solder at modulating valve connection and rotate valve and tubing enough to clear compressor. Remove valve and tubing. Replace defective modulating solenoid valve being careful to wrap body of replacement

4-18

valve with a wet cloth while brazing. The coil need not be removed.

4. Install new suction service valve gasket and install bolts in suction service valve. Torque to a value of 2.77 to 4.15 mkg (20 to 30 ft/lb).

5. Solder all connections and leak check same.

6. Dehydrate and evacuate the unit per section 4.3 and then add refrigerant charge per section 4.4.2.

4.26 THERMOSTATIC EXPANSION VALVE

The thermal expansion valve is an automatic device whichmaintains constant superheat of the refrigerant gas leaving the evaporator regardless of suction pressure. The valve functions are: (a) automatic response of refrigerant flow to match the evaporator load and (b) prevention of liquid refrigerant entering the compressor. Unless the valve is defective, it seldom requires any maintenance.

6

2 5

3

7

1 4

1. Power Assembly 2. Body Flange Gaskets 3. Seat Gasket 4. Bulb

5. Cage Assembly 6. Body Flange 7. Body Flange Screws

Figure 4-24. Thermostatic Expansion Valve

a. Removing Expansion Valve 1. Store the refrigerant in an evacuated container

by attaching a hose to the liquid line valve.

2. Remove insulation (Presstite) from expansion valve bulb and power assembly and then remove thermal bulb from the suction line.

3. Loosen flare nut and disconnect equalizing line from expansion valve.

4. Remove capscrews and lift off power assembly and remove cage assembly. Check for foreign material in valve body.

5. The thermal bulb is located below the center of the suction line (4 oclock position). This area must be clean to ensure positive bulb contact. Strap thermal bulb to suction line and insulate both with Presstite.

b. Installing Expansion Valve

1. Replace all gaskets, make sure to lightly coat with oil. Insert cage and power assembly and bolts.

Tighten bolts equally. Fasten equalizer flare nut to expansion valve.

2. Leak check the unit per section 4.2. Evacuate and dehydrate unit per section 4.3 and add refrigerant charge per section 4.4.2.

3. Clean suction line with sandpaper before installing bulb to ensure proper heat transfer. Strap thermal bulb to suction line, making sure bulb is firmly against suction line. The bulb is located in the 4 oclock position on the suction line.

4. Check superheat. (See Table 4-6) Superheat setting is 4.4 to 5.5_C (8 to 10_F) at 0_C (32_F)container temperature.

c. Checking Superheat NOTE

It is not recommended adjusting internal adjustable valves unless absolutely necessary.

If a replacement valve has the wrong superheat setting, the valve may be adjusted if you do not have another replacement valve on hand. Due to the time involved in adjusting the superheat, replace the valve rather than adjusting it.

To Measure Superheat:

1. Open access panel to expose the expansion valve and 1/4 port (see Figure 1-1). The 1/4 port is equipped with a Schrader fitting.

2. Attach a temperature tester sensor near the expansion valve bulb and insulate. Make sure the suction line is clean and firm contact is made with tester.

3. Connect an accurate gauge to the 1/4 port.

4. Run unit until unit has stabilized. Set controller 5.5_C (10_F) below container temperature.

NOTE Suction pressuremust be 0.5 kg/cm@ (6 psig) below valve M.O.P. (maximum operating pressure). Example: if valve rated at 55 MOP, suction pressure must be below this MOP. Recommended pressure is below 3.44 kg/cm@ (49 psig).

5. From the temperature/pressure chart (Table 4-6), determine the saturation temperature corresponding to the evaporator outlet pressure.

6. Note the temperature of the suction gas at the expansion valve bulb.

7. Subtract the saturation temperaturedetermined in Step 6 from the average temperaturemeasured in Step 5. The difference is the superheat of the suction gas.

d. Adjusting Superheat 1. Remove the refrigerant and then remove the two

bolts holding the valve body together.

2. Remove the cage assembly and rotate the adjusting nut to increase or decrease the superheat. Turning the nut to compress the valve spring will increase the superheat and decrease refrigerant flow through the valve. Decompressing the spring will decrease the superheat and increase the refrigerant flow through the

4-19

valve (one complete turn will change the setting approximately 1.7_C (3_F).

3. Reassemble the valve and then start the unit.

4. When the unit has stabilized operation for at least 20 minutes, recheck superheat setting.

5. If superheat setting is correct, remove gauge and thermocouple. Secure panel in position.

4.27 EVAPORATOR FAN MOTOR CAPACITORS The two-speed evaporator fan motors are of the

permanent-split capacitor type. The motor is equipped with one capacitor (used in the high speed circuit) and another capacitor is used for the low speed circuit.

a. When to check for a defective capacitor 1. Fan motor will not change speed. For example:

controller settings above ---10_C (+14_F) cause the motor to run in high speed.

Controller settings below ---10_C (+14_F) cause the motor to run in low speed.

2. Motor running in wrong direction (after checking for correct wiring application).

b. Removing the capacitor

WARNING Make sure power to the unit is OFF and power plug disconnected before removing capacitor(s).

1. The capacitor located on the motor and above the evaporator fandeckmaybe removedby twomethods:

(a) If container is empty, open upper, rear, panel of the unit and capacitor may be serviced after disconnecting power plug.

(b) If container is full, turn the unit powerOFF and disconnect power plug. Remove the #2 evaporator fan motor access panel. (See Figure 1-1). Remove two lower capscrews securing motor assembly to bracket and then remove Ty-Raps from wire harness. Loosen two upper capscrews on the fan motor assembly. Remove or set aside motor to reach capacitors. With power OFF discharge the capacitor and disconnect the circuit wiring.

c. Checking the capacitor

Three methods for checking capacitors are:

(1) Direct replacement, (2) volt-ohmmeter, and (3) capacitor analyzer.

1. Direct replacement of capacitor with one of the same value.

2. Volt-ohmmeter set on RX 10,000 ohms. Connect ohmmeter leads across the capacitor terminals and observe the meter needle. If the capacitor is good, the needlewillmakea rapid swing toward zero resistance and then gradually swing back toward a very high resistance reading.

If the capacitor has failed open, the ohmmeter needle will not move when the meter probes touch the terminals. If the capacitor is shorted, the needle will swing to zero resistance position and stay there.

3. Capacitor analyzer

The function of the analyzer is to read the microfarad value of a capacitor and to detect insulation breakdown under load conditions. The important advantages of a analyzer is its ability to locate capacitors that have failed to hold their microfarad ratings or ones that are breaking down internally during operation. It is also useful in identifying capacitors when their microfarad rating marks have become unreadable.

4.28 HUMIDISTAT

a. Maintenance Soiled sensing elements can be cleaned by dipping

the stem in soapy fresh water or fresh water with washing powder (max. 80_C = 176_F).

When drying, the stem must remain tensioned, i.e., the set point knob is set to approximately 0% R.H. Drying time approximately 24 hours. If necessary, recalibrate the humidistat.

b. Setting

1. The upper switching point of switch A is set by the set point knob E (See Figure 4-25).

2. In case of deviations of the measured humidity from the set point, a recalibration bymeans of the nut (S) is recommended:

E

S

A

Figure 4-25. Humidistat

3. If the actual value is higher than the set point, turn nut (S) clockwise.

4. If the actual value is lower than the set point, turn nut (S) counterclockwise.

Set Point 20% 40% 60% 70% 80% 1/6 turn --- 15% 15% 11% 8% 5%

4-20

4.29 MICROPROCESSOR CONTROLLER NOTE

For manual override operation of the microprocessor, refer to Table 4-7.

CAUTION

When doing any arc welding on the unit or container, disconnect all connectors from controller and remove ground lead going to I/O board to prevent any damagedue to electrostatic discharge.

a. Handling of Microprocessor Controllers

Here is a list of guidelines that should be followed when handling a microprocessor controller. These steps should be implemented when replacing the controller, when doing any arc welding on the unit, orwhen service to the refrigeration unit requires handling and removal of the controller.

1. Obtain a grounding wrist strap and a static dissipation mat. The wrist strap, when properly grounded, will dissipate any potential built up on the body. The dissipation mat will provide a static free work surface to place and/or service the microprocessor controller. Note: Use a dissipation mat such as the 3M 8501StaticProtective FieldServiceKit or equivalent. For information write: Static Control Systems Division/3m, P.O. Box 2963, Austin, Texas 78769-2963.

2. Disconnect power to the unit.

3. Attach the ground or clip endof thewrist strap to any exposed metal area on the refrigeration unit frame (bolts, screws, etc.).

4. Carefully remove themicroprocessor controller. Do not touch any of the electrical components if possible. Place the controller on the static mat. If arc welding is to be performed on the unit, it is not necessary to remove controller. Simply disconnect all connectors from controller and remove ground lead going to I/O board.

5. At this point, if you are servicing the refrigeration unit, you are free to remove the ground strap from your wrist and complete your work.

5a. Upon completion of your service work put the wrist strap back on, and re-install the controller into the refrigeration unit.

6. If you are replacing the controller, do not remove the wrist strap. Remove the newmicroprocessor controller from its packaging and install it on the refrigeration unit. Place the old controller into the same packaging that accompanied the new controller. Make sure that you package it in the exact same manner.

NOTE

This packaging has been designed to protect the controller from both physical and electrostatic discharge damage during storage and transit.

b. Removing and Installing Microprocessor Control Box

1. Remove two screws (item 5, Figure 4-26) and swing control panel (item 6) down.

2. Remove three screws and loosen three other screws to remove cover (item 3).

3. Disconnect all plug connectors and move wiring out of the way.

4. Remove two screws (item 1) and slide microprocessor control box (item 4) and two spacers (item 2) to the left and out.

NOTE There are two spacers in the right hand side of the electrical box. DO NOT LOOSEN these spacers as they are factory positioned.

5. Install microprocessor control box by reversing the above steps.

4-21

In range

SETPOINT/Code

DataCORDER

Cool Heat Defrost Alarm

AIR TEMP/Data

1 2 3 4

5

6

1. Screw 2. Spacer 3. Cover

4. Microprocessor Control Box 5. Screw 6. Microprocessor Control Panel

Figure 4-26. Microprocessor Control Box

4-22

Table 4-1. Wear Limits For Compressors

FACTORY MAXIMUM FACTORY MINIMUM MAXIMUM WEAR PART NAME BEFORE REPAIR

INCHES MM INCHES MM INCHES MM MAIN BEARING Main Bearing Diameter 1.6268 41.3207 .0020 0.0508 Main Bearing Journal Diameter 1.6233 41.2318 .0020 0.0508 PUMP END Main Bearing Diameter 1.3760 34.9504 .0020 0.0508 Main Bearing Journal Diameter 1.3735 34.8869 .0020 0.0508 CONNECTING ROD 1.3768 34.9707 .0020 0.0508 Piston Pin Bearing 0.6878 17.4701 .0010 0.0254 CRANKPIN DIAMETER 1.3735 34.8869 .0025 0.0635 Throw (28 CFM) 0.7354 18.6792 0.7334 18.6284 CRANKPIN DIAMETER 1.3735 34.8869 .0025 0.0635 Throw (37 CFM) 0.9698 24.6329 0.9678 24.5821 CRANKPIN DIAMETER 1.3735 34.8869 .0025 0.0635 Throw (41 CFM) 1.072 27.2288 1.070 27.1780 THRUST WASHER (Thickness) (28 & 37 CFM) 0.145 3.6830 0.1440 03.6576 .0250 0.6350 THRUST WASHER (Thickness) (41 CFM) 0.154 3.9116 0.1520 03.8608 .0250 0.6350 CYLINDERS Bore 2.0010 50.8254 .0020 0.0508 Piston (Diameter) 1.9860 50.4444 .0020 0.0508 Piston Pin (Diameter) 0.6873 17.4574 .0010 0.0254 Piston Ring Gap 0.013 00.3302 0.0050 00.1270 .0250 0.6350 Piston Ring Side Clearance

(28 & 37 CFM) 0.001 00.0254 0.0000 00.0000 .0020 0.0508 Piston Ring Side Clearance

(41 CFM) 0.002 00.0508 0.0010 00.0254 .0020 0.0508

4-23

Table 4-2. Compressor Torque Values

TORQUE RANGE SIZE

USAGE DIAMETER THREADS

FT LB MKG (INCHES) PER INCH

-

1/16 27 (pipe) 8 --- 12 1.11 --- 1.66 Pipe Plug --- Crankshaft 1/8 20 (pipe) 6 --- 10 0.83 --- 1.38 Oil Return Check Valve --- Crankcase 1/4 20 (pipe) 20 --- 25 2.77 --- 3.46 Pipe Plug --- Gauge Connection 1/4 20 10 --- 12 1.38 --- 1.66 Connecting Rod Capscrew

12 --- 15 1.66 --- 2.07 Baffle Plate --- Crankcase

1/4 28 12 --- 16 1.66 --- 2.21 Side Shield 6 --- 10 0.83 --- 1.38 Oil Pump Drive Segment 12 --- 16 1.66 --- 2.21 Unloader Valve

Cover Plate --- Plate End

16 --- 20 2.21 --- 2.77 Bearing Head

5/16 18 Terminal Block Cap Screws

20 30 2 77 4 15 Suction Valve

--- . --- . Discharge Valve Pump End Bearing Head

3/8 16 40 --- 50 5.53 --- 6.92 Bottom Plate --- Crankcase Compressor Foot Cylinder Head

7/16 14 55 --- 60 7.61 --- 8.30 Motor End Cover --- Crankcase 5/8 11 25 --- 30 3.46 --- 4.15 Crankshaft 5/8 18 60 --- 75 8.30 --- 10.37 Oil Bypass Plug --- Crankcase #10 32 4 --- 6 0.55 --- 0.83 Oil Pump Drive Segment 1-1/2 18 NEF 35 --- 45 4.84 --- 6.22 Oil Level Sight Glass

NEF --- National Extra Fine

4-24

Table 4-3. Partlow Bulb Temperature-Resistance Chart

TEMPERATURE RESISTANCE F C (OHMS) ---10 ---23.3 12561.00 ---5 ---20.6 10579.70 0 ---17.8 8944.17 5 ---15.0 7588.89 15 ---9.4 5520.32 20 ---6.7 4731.71 25 ---3.9 4068.68 30 ---1.1 3509.36 32 0 3310.57 35 1.7 3035.99 40 4.4 2634.10 45 7.2 2291.85 50 10.0 1999.52 55 12.8 1749.11 60 15.6 1534.00 65 18.3 1348.72 75 23.9 1050.14 80 26.7 929.87 85 29.4 825.21 90 32.2 733.93 95 35.0 654.12 100 37.8 584.19 105 40.6 522.79

Table 4-4. Controller and Recorder Sensor Temperature-Resistance Chart

Temperature Temperature Resistance Centigrade Fahrenheit (Ohms)

SENSOR, Resistance Temperature Detector (RTD) -- PART NO. 12-01090-00

0 32 100 .039 25 77 109.9 .05

SENSOR, RTD -- PART NO. 12-01119-00 0 32 100 .039 25 77 109.7 .05

SENSOR, RTD -- PART NO. 12-00306-00 0 32 100 .039 25 77 109.9 .05

SENSOR, Thermistor -- PART NO. 12-00278-01 0 32 32,650 91 25 77 10,000 50

Table 4-5. Recommended Bolt Torque Values

BOLT DIA. THREADS TORQUE MKG FREE SPINNING

#4 #6 #8 #10 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4

40 32 32 24 20 18 16 14 13 12 11 10

5.2 in-lbs 9.6 in-lbs 20 in-lbs 23 in-lbs 75 in-lbs 11 ft-lbs 20 ft-lbs 31 ft-lbs 43 ft-lbs 57 ft-lbs 92 ft-lbs 124 ft-lbs

0.05 0.11 0.23 0.26 0.86 1.52 2.76 4.28 5.94 7.88 12.72 17.14

NONFREE SPINNING (LOCKNUTS ETC.) 1/4 5/16 3/8 7/16 1/2 9/16 5/8 3/4

20 18 16 14 13 12 11 10

82.5 in-lbs 145.2 in-lbs 22.0 ft-lbs 34.1 ft-lbs 47.3 ft-lbs 62.7 ft-lbs 101.2 ft-lbs 136.4 ft-lbs

0.95 1.67 3.04 4.71 6.54 8.67 13.99 18.86

4-25

Table 4-6. Temperature-Pressure Chart --- R-12 BOLD FIGURES = Inches Mercury Vacuum (cm Hg Vac)

LIGHT FIGURES = psig (kg/cm@)

TEMPERATURE PRESSURE TEMPERATURE PRESSURE F C Psig Kg/cm2 Bar F C Psig Kg/cm2 Bar ---40 ---40 11.0 27.90 -- .37 28 ---2 26.9 1.89 1.85 ---35 ---37 8.4 21.30 -- .28 30 ---1 28.5 2.00 1.97 ---30 ---34 5.5 14.00 -- .19 32 0 30.1 2.12 2.08 ---28 ---33 4.3 10.90 -- .15 34 1 31.7 2.23 2.19 ---26 ---32 3.0 7.60 -- .10 36 2 33.4 2.35 2.30 ---24 ---31 1.6 4.10 -- .05 38 3 35.2 2.47 2.43 ---22 ---30 0.3 0.80 -- .01 40 4 37.0 2.60 2.55 ---20 ---29 0.5 .04 .03 45 7 41.7 2.93 2.88 ---18 ---28 1.3 .09 .09 50 10 46.7 3.28 3.22 ---16 ---27 2.1 .15 .14 55 13 52.0 3.66 3.59 ---14 ---26 2.8 .20 .19 60 16 57.7 4.06 3.98 ---12 ---24 3.7 .26 .26 65 18 63.8 4.49 4.40 ---10 ---23 4.5 .32 .31 70 21 70.2 4.94 4.84 ---8 ---22 5.4 .38 .37 75 24 77.0 5.41 5.31 ---6 ---21 6.3 .44 .43 80 27 84.2 5.92 5.81 ---4 ---20 7.2 .51 .50 85 29 91.8 6.45 6.33 ---2 ---19 8.2 .58 .57 90 32 99.8 7.02 6.88 0 ---18 9.2 .65 .63 95 35 108.2 7.61 7.42 2 ---17 10.2 .72 .70 100 38 117.2 8.24 8.08 4 ---16 11.2 .79 .77 105 41 126.6 8.90 8.73 6 ---14 12.3 .86 .85 110 43 136.4 9.59 9.40 8 ---13 13.5 .95 .93 115 46 146.8 10.32 10.12 10 ---12 14.6 1.03 1.01 120 49 157.6 11.08 10.87 12 ---11 15.8 1.11 1.09 125 52 169.1 11.89 11.66 14 ---10 17.1 1.20 1.18 130 54 181.0 12.73 12.48 16 ---9 18.4 1.29 1.27 135 57 193.5 13.60 13.34 18 ---8 19.7 1.39 1.36 140 60 206.6 14.53 14.24 20 ---7 21.0 1.48 1.45 145 63 220.3 15.49 15.19 22 ---6 22.4 1.57 1.54 150 66 234.6 16.49 16.18 24 ---4 23.9 1.68 1.65 155 68 249.5 17.54 17.20 26 ---3 25.4 1.79 1.75 160 71 265.1 18.64 18.28

4-26

Table 4-7. Manual Override Operation of Microprocessor

MODE STEP OPERATION DISCONNECT WIRE JUMPER WIRE 1 Condenser Fan PD14 to TB15 from TB15 TB15 to CFC1

Full Cooling 2 Compressor PD2 to TB7 from TB7 TB7 to CC1 3 Evaporator Fan PD6 to TB14 from TB14 TB14 to EFC1

Low Heating 3 Evaporator Fan Perform step 3 Perform step 3 High Heating 3 & 4 Resistance Heaters & Evap. Fans Perform steps 3 & 4 Perform steps 3 & 4

Defrost 4 Resistance Heaters PD9 to TB16 from TB16 TB16 to HRC1

WARNING

Make sure power to unit is OFF (CB-1 & CB-2) and power plug(s) disconnected before working inside the control box. CAUTION

Overheating and cycling of heaters by HTTwill result if unit is left in a defrost condition (step 4) after all frost has been melted from the evaporator coil and water ceases running from the drain hose.

NOTES 1. If microprocessor controller alarm functions remain operational, manual override jumpering will result in false alarms being indicated. 2. Defrosting will only occur when step 4 alone is performed (steps 1, 2 & 3 interrupted), and prior operation has been at frost forming temperatures.

3. When performing the emergency jump bypass of the microprocessor the unit may still be started/stopped using start/stop switch (ST).

5-1

SECTION 5

ELECTRICAL WIRING SCHEMATIC AND DIAGRAMS

5.1 INTRODUCTION

This section contains Electrical Wiring Schematics and Diagrams covering the Models listed in Table 1-1. The following general safety notices supplement the specificwarnings andcautions appearingelsewhere in thismanual. They are recommended precautions that must be understood and applied during operation and maintenance of the equipment covered herein.

WARNING

Beware of unannounced starting of the evaporator and condenser fans. Do not open condenser fan grille before turning power OFF and disconnecting power plug.

WARNING

Do not attempt to remove power plug(s) before turning OFF start-stop switch (ST), unit circuit breaker(s) and external power source.

Make sure the power plugs are clean and dry before connecting to any power receptacle.

WARNING Make sure power to unit is OFF and power plug disconnected before replacing the compressor.

WARNING

Do not use a nitrogen cylinder without a pressure regulator. Do not use oxygen in or near a refrigeration system as an explosion may occur.

WARNING

Always turn OFF the unit circuit breaker (CB1) and disconnect main power supply before working on moving parts.

WARNING

Before servicing unit, make sure the unit circuit breaker (CB1) and the start-stop switch are in the OFF position. Also disconnect power plug and cable.

WARNING

Make sure power to unit is OFF and power plug disconnected before removing capacitor(S).

CAUTION

When doing any arc welding on the unit or container, disconnect all connectors from controller and remove ground lead going to I/O board to prevent any damage due to electrostatic discharge.

5-2

Figure 5-1. Electrical Wiring Schematic (Models 69NT40-444 & 444-2) (Sheet 1 of 2)

5-3

Figure 5-1. Electrical Wiring Schematic (Models 69NT40-444 & 444-2) (Sheet 2 of 2)

5-4

Figure 5-2. Electrical Wiring Diagram (Models 69NT40-444 & 444-2) (Sheet 1 of 2)

5-5

Figure 5-2. Electrical Wiring Diagram (Models 69NT40-444 & 444-2) (Sheet 2 of 2)

5-6

Figure 5-3. Electrical Wiring Schematic (Model 69NT40-444-1) (Sheet 1 of 2)

5-7

Figure 5-3. Electrical Wiring Schematic (Model 69NT40-444-1) (Sheet 2 of 2)

5-8

Figure 5-4. Electrical Wiring Diagram (Model 69NT40-444-1) (Sheet 1 of 2)

5-9

Figure 5-4. Electrical Wiring Diagram (Model 69NT40-444-1) (Sheet 2 of 2)

5-10

Figure 5-5. Electrical Wiring Schematic (Model 69NT40-444-3) (Sheet 1 of 2)

5-11

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A B C D E F G H I J K L M N O P Q R

Figure 5-5. Electrical Wiring Schematic (Model 69NT40-444-3) (Sheet 2 of 2)

5-12

Figure 5-6. Electrical Wiring Diagram (Model 69NT40-444-3) (Sheet 1 of 2)

5-13

Figure 5-6. Electrical Wiring Diagram (Model 69NT40-444-3) (Sheet 2 of 2)

5-14

Figure 5-7. Electrical Wiring Schematic (Model 69NT40-444-4) (Sheet 1 of 2)

5-15

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A B C D E F G H I J K L M N O P Q R

Figure 5-7. Electrical Wiring Schematic (Model 69NT40-444-4) (Sheet 2 of 2)

5-16

Figure 5-8. Electrical Wiring Diagram (Model 69NT40-444-4) (Sheet 1 of 2)

5-17

Figure 5-8. Electrical Wiring Diagram (Model 69NT40-444-4) (Sheet 2 of 2)

5-18

Figure 5-9. Electrical Wiring Schematic (Model 69NT40-454) (Sheet 1 of 2)

5-19

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A B C D E F G H I J K L M N O P Q R

Figure 5-9. Electrical Wiring Schematic (Model 69NT40-454) (Sheet 2 of 2)

5-20

Figure 5-10. Electrical Wiring Diagram (Model 69NT40-454) (Sheet 1 of 2)

5-21

Figure 5-10. Electrical Wiring Diagram (Model 69NT40-454) (Sheet 2 of 2)

5-22

Figure 5-11. Electrical Wiring Schematic (Model 69NT20-274) (Sheet 1 of 2)

5-23

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A B C D E F G H I J K L M N O P Q R

Figure 5-11. Electrical Wiring Schematic (Model 69NT20-274) (Sheet 2 of 2)

5-24

Figure 5-12. Electrical Wiring Diagram (Model 69NT20-274) (Sheet 1 of 2)

5-25

Figure 5-12. Electrical Wiring Diagram (Model 69NT20-274) (Sheet 2 of 2)

5-26

Figure 5-13. Electrical Wiring Schematic (Model 69NT20-274-1) (Sheet 1 of 2)

5-27

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A B C D E F G H I J K L M N O P Q R

Figure 5-13. Electrical Wiring Schematic (Model 69NT20-274-1) (Sheet 2 of 2)

5-28

Figure 5-14. Electrical Wiring Diagram (Model 69NT20-274-1) (Sheet 1 of 2)

5-29

Figure 5-14. Electrical Wiring Diagram (Model 69NT20-274-1) (Sheet 2 of 2)

5-30

Figure 5-15. Electrical Wiring Schematic (Model 69NT40-444-6) (Sheet 1 of 2)

5-31

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A B C D E F G H I J K L M N O P Q R

Figure 5-15. Electrical Wiring Schematic (Model 69NT40-444-6) (Sheet 2 of 2)

5-32

Figure 5-16. Electrical Wiring Diagram (Model 69NT40-444-6) (Sheet 1 of 2)

5-33

Figure 5-16. Electrical Wiring Diagram (Model 69NT40-444-6) (Sheet 2 of 2)

5-34

Figure 5-17. Electrical Wiring Schematic (Model 69NT40-454-1) (Sheet 1 of 2)

5-35

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A B C D E F G H I J K L M N O P Q R

Figure 5-17. Electrical Wiring Schematic (Model 69NT40-454-1) (Sheet 2 of 2)

5-36

Figure 5-18. Electrical Wiring Diagram (Model 69NT40-454-1) (Sheet 1 of 2)

5-37

Figure 5-18. Electrical Wiring Diagram (Model 69NT40-454-1) (Sheet 2 of 2)

5-38

Figure 5-19. Electrical Wiring Schematic (Model 69NT40-444-9) (Sheet 1 of 2)

5-39

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A B C D E F G H I J K L M N O P Q R

Figure 5-19. Electrical Wiring Schematic (Model 69NT40-444-9) (Sheet 2 of 2)

5-40

Figure 5-20. Electrical Wiring Diagram (Model 69NT40-444-9) (Sheet 1 of 2)

5-41

Figure 5-20. Electrical Wiring Diagram (Model 69NT40-444-9) (Sheet 2 of 2)

5-42

Figure 5-21. Electrical Wiring Schematic (Model 69NT40-444-11) (Sheet 1 of 2)

5-43

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A B C D E F G H I J K L M N O P Q R

Figure 5-21. Electrical Wiring Schematic (Model 69NT40-444-11) (Sheet 2 of 2)

5-44

Figure 5-22. Electrical Wiring Diagram (Model 69NT40-444-11) (Sheet 1 of 2)

5-45

Figure 5-22. Electrical Wiring Diagram (Model 69NT40-444-11) (Sheet 2 of 2)

5-46

Figure 5-23. Electrical Wiring Schematic (Model 69NT40-444-10) (Sheet 1 of 2)

5-47

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Figure 5-23. Electrical Wiring Schematic (Model 69NT40-444-10) (Sheet 2 of 2)

5-48

Figure 5-24. Electrical Wiring Diagram (Model 69NT40-444-10) (Sheet 1 of 2)

5-49

Figure 5-24. Electrical Wiring Diagram (Model 69NT40-444-10) (Sheet 2 of 2)

5-50

Figure 5-25. Electrical Wiring Schematic (Model 69NT40-444-7 & 444-8) (Sheet 1 of 2)

5-51

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Figure 5-25. Electrical Wiring Schematic (Model 69NT40-444-7 & 444-8) (Sheet 2 of 2)

5-52

Figure 5-26. Electrical Wiring Diagram (Model 69NT40-444-7 & 444-8) (Sheet 1 of 2)

5-53

Figure 5-26. Electrical Wiring Diagram (Model 69NT40-444-7 & 444-8) (Sheet 2 of 2)

5-54

Figure 5-27. Electrical Wiring Schematic (Model 69NT40-444-12) (Sheet 1 of 2)

5-55

Figure 5-27. Electrical Wiring Schematic (Model 69NT40-444-12) (Sheet 2 of 2)

5-56

Figure 5-28. Electrical Wiring Diagram (Model 69NT40-444-12) (Sheet 1 of 2)

5-57

Figure 5-28. Electrical Wiring Diagram (Model 69NT40-444-12) (Sheet 2 of 2)

5-58

Figure 5-29. Electrical Wiring Schematic (Model 69NT40-454-2 & 454-3) (Sheet 1 of 2)

5-59

Figure 5-29. Electrical Wiring Schematic (Model 69NT40-454-2 & 454-3) (Sheet 2 of 2)

5-60

Figure 5-30. Electrical Wiring Diagram (Model 69NT40-454-2 & 454-3) (Sheet 1 of 2)

5-61

Figure 5-30. Electrical Wiring Diagram (Model 69NT40-454-2 & 454-3) (Sheet 2 of 2)

5-62

Figure 5-31. Electrical Wiring Schematic (Model 69NT20---274---2) (Sheet 1 of 2)

5-63

Figure 5-31. Electrical Wiring Schematic (Model 69NT20---274---2) (Sheet 2 of 2)

5-64

Figure 5-32. Electrical Wiring Diagram (Model 69NT20---274---2) (Sheet 1 of 2)

5-65

Figure 5-32. Electrical Wiring Diagram (Model 69NT20---274---2) (Sheet 2 of 2)

5-66

Figure 5-33. Electrical Wiring Schematic (Model 69NT40-444---13) (Sheet 1 of 2)

5-67

Figure 5-33. Electrical Wiring Schematic (Model 69NT40-444---13) (Sheet 2 of 2)

5-68

Figure 5-34. Electrical Wiring Diagram (Model 69NT40-444---13) (Sheet 1 of 2)

5-69

Figure 5-34. Electrical Wiring Diagram (Model 69NT40-444---13) (Sheet 2 of 2)

5-70

Figure 5-35. Electrical Wiring Schematic (Model 69NT40-444---14) (Sheet 1 of 2)

5-71

Figure 5-35. Electrical Wiring Schematic (Model 69NT40-444---14) (Sheet 2 of 2)

5-72

Figure 5-36. Electrical Wiring Diagram (Model 69NT40-444---14) (Sheet 1 of 2)

5-73

Figure 5-36. Electrical Wiring Diagram (Model 69NT40-444---14) (Sheet 2 of 2)

5-74

Figure 5-37. Electrical Wiring Schematic (Model 69NT40-444-15) (Sheet 1 of 2)

5-75

Figure 5-37. Electrical Wiring Schematic (Model 69NT40-444-15) (Sheet 2 of 2)

5-76

Figure 5-38. Electrical Wiring Diagram (Model 69NT40-444-15) (Sheet 1 of 2)

5-77

Figure 5-38. Electrical Wiring Diagram (Model 69NT40-444-15) (Sheet 2 of 2)

5-78

Figure 5-39. Electrical Wiring Schematic (Model 69NT40-444-16) (Sheet 1 of 2)

5-79

Figure 5-39. Electrical Wiring Schematic (Model 69NT40-444-16) (Sheet 2 of 2)

5-80

Figure 5-40. Electrical Wiring Diagram (Model 69NT40-444-16) (Sheet 1 of 2)

5-81

Figure 5-40. Electrical Wiring Diagram (Model 69NT40-444-16) (Sheet 2 of 2)

5-82

Figure 5-41. Electrical Wiring Schematic (Model 69NT40-444-17) (Sheet 1 of 2)

5-83

Figure 5-41. Electrical Wiring Schematic (Model 69NT40-444-17) (Sheet 2 of 2)

5-84

Figure 5-42. Electrical Wiring Diagram (Model 69NT40-444-17) (Sheet 1 of 2)

5-85

Figure 5-42. Electrical Wiring Diagram (Model 69NT40-444-17) (Sheet 2 of 2)

5-86Revised 8-6-93

Figure 5-43. Electrical Wiring Schematic (Model 69NT20-274-3) (Sheet 1 of 2)

5-87 Revised 8-6-93

Figure 5-43. Electrical Wiring Schematic (Model 69NT20-274-3) (Sheet 2 of 2)

5-88Revised 8-6-93

Figure 5-44. Electrical Wiring Diagram (Model 69NT20-274-3) (Sheet 1 of 2)

5-89 Revised 8-6-93

Figure 5-44. Electrical Wiring Diagram (Model 69NT20-274-3) (Sheet 2 of 2)

5-90Revised 8-6-93

Figure 5-45. Electrical Wiring Schematic (Model 69NT40-444-18) (Sheet 1 of 2)

5-91 Revised 8-6-93

Figure 5-45. Electrical Wiring Schematic (Model 69NT40-444-18) (Sheet 2 of 2)

5-92Revised 8-6-93

Figure 5-46. Electrical Wiring Diagram (Model 69NT40-444-18) (Sheet 1 of 2)

5-93 Revised 8-6-93

Figure 5-46. Electrical Wiring Diagram (Model 69NT40-444-18) (Sheet 2 of 2)

5-94Revised 8-6-93

Figure 5-47. Electrical Wiring Schematic (Model 69NT40-444-19) (Sheet 1 of 2)

5-95 Revised 8-6-93

Figure 5-47. Electrical Wiring Schematic (Model 69NT40-444-19) (Sheet 2 of 2)

5-96Revised 8-6-93

Figure 5-48. Electrical Wiring Diagram (Model 69NT40-444-19) (Sheet 1 of 2)

5-97 Revised 8-6-93

Figure 5-48. Electrical Wiring Diagram (Model 69NT40-444-19) (Sheet 2 of 2)

5-98Revised 8-6-93

Figure 5-49. Electrical Wiring Schematic (Models 69NT40-441-21 & 69NT40-444-21) (Sheet 1 of 2)

5-99 Revised 8-6-93

Figure 5-49. Electrical Wiring Schematic (Models 69NT40-441-21 & 69NT40-444-21) (Sheet 2 of 2)

5-100Revised 8-6-93

Figure 5-50. Electrical Wiring Diagram (Models 69NT40-441-21 & 69NT40-444-21) (Sheet 1 of 2)

5-101 Revised 8-6-93

Figure 5-50. Electrical Wiring Diagram (Models 69NT40-441-21 & 69NT40-444-21) (Sheet 2 of 2)

5-102Revised 8-6-93

Figure 5-51. Electrical Wiring Schematic (Models 69NT40-444-20, -444-22, -444-23 & 69NT40-441-22, -23, -25) (Sheet 1 of 2)

5-103 Revised 8-6-93

Figure 5-51. Electrical Wiring Schematic (Models 69NT40-444-20, -444-22, -444-23 & 69NT40-441-22, -23, -25) (Sheet 2 of 2)

5-104Revised 8-6-93

Figure 5-52. Electrical Wiring Diagram (Models 69NT40-444-20, -444-22, -444-23 & 69NT40-441-22, -23, -25) (Sheet 1 of 2)

5-105 Revised 8-6-93

Figure 5-52. Electrical Wiring Diagram (Models 69NT40-444-20, -444-22, -444-23 & 69NT40-441-22, -23, -25) (Sheet 2 of 2)

5-106Revised 8-6-93

Figure 5-53. Electrical Wiring Schematic (Model 69NT40-441-24) (Sheet 1 of 2)

5-107 Revised 8-6-93

Figure 5-53. Electrical Wiring Schematic (Model 69NT40-441-24) (Sheet 2 of 2)

5-108Revised 8-6-93

Figure 5-54. Electrical Wiring Diagram (Model 69NT40-441-24) (Sheet 1 of 2)

5-109 Revised 8-6-93

Figure 5-54. Electrical Wiring Diagram (Model 69NT40-441-24) (Sheet 2 o

Manualsnet FAQs

If you want to find out how the Transicold 69NT40-454 Carrier works, you can view and download the Carrier Transicold 69NT40-454 Operation Manual on the Manualsnet website.

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