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Carrier 48HC17 28 Installation Instructions PDF

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Summary of Content for Carrier 48HC17 28 Installation Instructions PDF

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480309-01 Printed in U.S.A. Form 48HC-17-28-04SI Rev. A Pg 1 11-21 Replaces: 48HC-17-28-03SI

Installation Instructions

CONTENTS Page

SAFETY CONSIDERATIONS . . . . . . . . . . . . . . . . . . . 2 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Rated Indoor Airflow (CFM) . . . . . . . . . . . . . . . . . . . . 3 INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Jobsite Survey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20 Step 1 Plan for Unit Location . . . . . . . . . . . . . . . 20 ROOF MOUNT Step 2 Plan for Sequence of Unit Installation . . 20 CURB-MOUNTED INSTALLATION PAD-MOUNTED INSTALLATION FRAME-MOUNTED INSTALLATION Step 3 Inspect Unit . . . . . . . . . . . . . . . . . . . . . . . . 21 Step 4 Provide Unit Support . . . . . . . . . . . . . . . . 21 ROOF CURB MOUNT SLAB MOUNT (HORIZONTAL UNITS ONLY) ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR

SLAB MOUNT) Step 5 Field Fabricate Ductwork . . . . . . . . . . . . . 25 Step 6 Rig and Place Unit . . . . . . . . . . . . . . . . . . 25 POSITIONING ON CURB Step 7 Horizontal Duct Connection . . . . . . . . . . 26 Step 8 Install Outside Air Hood - Factory Option . 26 Step 9 Assemble Barometric Hood . . . . . . . . . . . 27 BAROMETRIC HOOD (VERTICAL CONFIGURATION) BAROMETRIC HOOD (HORIZONTAL

CONFIGURATION) Step 10 Install Flue Hood and Combustion Air

Hood . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 Step 11 Install Gas Piping . . . . . . . . . . . . . . . . . . 29 GAS SUPPLY LINE FACTORY OPTION THRU-BASE CONNECTIONS Step 12 Install External Condensate Trap and

Line . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31 Step 13 Make Electrical Connections . . . . . . . . . 32 FIELD POWER SUPPLY UNITS WITHOUT FACTORY-INSTALLED NON-

FUSED DISCONNECT OR HACR UNITS WITH FACTORY-INSTALLED NON-FUSED

DISCONNECT OR HACR

ALL UNITS CONVENIENCE OUTLETS HACR FACTORY OPTION THRU-BASE CONNECTIONS UNITS WITHOUT THRU-BASE CONNECTIONS FIELD CONTROL WIRING THERMOSTAT UNIT WITHOUT THRU-BASE CONNECTION KIT HEAT ANTICIPATOR SETTINGS TRANSFORMER CONNECTION FOR 208 V POWER

SUPPLY Humidi-MiZer System Control Connections . . . . .37 HUMIDI-MIZER SPACE RH CONTROLLER EconoMi$er X (Factory Option) . . . . . . . . . . . . . . .39 SYSTEM COMPONENTS SPECIFICATIONS INPUTS OUTPUTS ENVIRONMENTAL ECONOMIZER MODULE WIRING DETAILS INTERFACE OVERVIEW SETUP AND CONFIGURATION ENTHALPY SETTINGS TWO-SPEED FAN OPERATION CHECKOUT TROUBLESHOOTING Low Ambient Control (Factory Option) . . . . . . . . . .53 Staged Air Volume (SAV) with Variable Frequency

Drive (Factory Option) . . . . . . . . . . . . . . . . . . . . . .53 ComfortLink Controls (Factory Option) . . . . . . . . . .53 PremierLink Control . . . . . . . . . . . . . . . . . . . . . . . .53 RTU Open Control System . . . . . . . . . . . . . . . . . . . .53 Wiring Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . .53 Smoke Detectors . . . . . . . . . . . . . . . . . . . . . . . . . . . .64 RETURN AIR SENSOR TUBE INSTALLATION SMOKE DETECTOR TEST MAGNET ADDITIONAL APPLICATION DATA Step 14 Adjust Factory-Installed Options . . . . . .65 ECONOMI$ER IV OCCUPANCY SWITCH Step 15 Install Accessories . . . . . . . . . . . . . . . . .65 Step 16 Check Belt Tension . . . . . . . . . . . . . . . . .65 BELT FORCE DEFLECTION METHOD BELT TENSION METHOD

48HC horizontal 17.5 and 20 ton units for installation in the United States contain use of Carrier's Staged Air Volume (SAV) 2-speed indoor fan control system. This complies with the U.S. Department of Energy (DOE) efficiency standard of 2018. 48HC units for installation outside the United States may or may not contain use of the SAV 2-speed indoor fan control system as they are not required to comply with the U.S. Department of Energy (DOE) efficiency standard of 2018. For specific details on operation of the Carrier SAV 2-speed indoor fan system, refer to the Variable Frequency Drive (VFD) Factory-Installed Option 2-Speed Motor Control Installation, Setup, and Troubleshooting manual.

WeatherMaster

48HC17-28 Single Package Rooftop Gas Heat/Electric Cooling

Unit with Puron (R-410A) Refrigerant

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Pre-Start and Start-Up . . . . . . . . . . . . . . . . . . . . . . . . 66 START-UP CHECKLIST . . . . . . . . . . . . . . . . . . . . . CL-1

SAFETY CONSIDERATIONS Installation and servicing of air-conditioning equipment can be hazardous due to system pressure and electrical components. Only trained and qualified service personnel should install, repair, or service air-conditioning equipment. Untrained personnel can perform basic maintenance functions of cleaning coils and filters and replacing filters. All other operations should be performed by trained service personnel. When working on air-conditioning equipment, observe precautions in the literature, tags and labels attached to the unit, and other safety precautions that may apply. Follow all safety codes, including ANSI (American National Standards Institute) Z223.1. Wear safety glasses and work gloves. Use quenching cloth for unbrazing operations. Have fire extinguisher available for all brazing operations. It is important to recognize safety information. This is the safety- alert symbol . When you see this symbol on the unit and in instructions or manuals, be alert to the potential for personal injury. Understand the signal words DANGER, WARNING, CAUTION, and NOTE. These words are used with the safety-alert symbol. DANGER identifies the most serious hazards which will result in severe personal injury or death. WARNING signifies hazards which could result in personal injury or death. CAUTION is used to identify unsafe practices, which may result in minor personal injury or product and property damage. NOTE is used to highlight suggestions which will result in enhanced installation, reliability, or operation.

WARNING

FIRE, EXPLOSION HAZARD Failure to follow this warning could result in death, serious personal injury and/or property damage. Disconnect gas piping from unit when pressure testing at pressure greater than 0.5 psig (3450 Pa). Pressures greater than 0.5 psig will cause gas valve damage resulting in hazardous condition. If gas valve is subjected to pressure greater than 0.5 psig, it must be replaced before use. When pressure testing field-supplied gas piping at pressures of 0.5 psig or less, a unit connected to such piping must be isolated by closing the manual gas valve(s).

DANGER

ELECTRICAL SHOCK HAZARD Failure to follow this warning will result in personal injury or death. Before performing service or maintenance operations on unit, turn off main power switch to unit and install lock(s) and lockout tag(s). Ensure electrical service to rooftop unit agrees with voltage and amperage listed on the unit rating plate. Unit may have more than one power switch.

WARNING

UNIT OPERATION AND SAFETY HAZARD Failure to follow this warning could cause personal injury, death and/or equipment damage. R-410A refrigerant systems operate at higher pressures than standard R-22 systems. Do not use R-22 service equipment or components on R-410A refrigerant equipment.

WARNING

PERSONAL INJURY AND ENVIRONMENTAL HAZARD Failure to follow this warning could cause personal injury or death. Relieve pressure and recover all refrigerant before system repair or final unit disposal. Wear safety glasses and gloves when handling refrigerants. Keep torches and other ignition sources away from refrigerants and oils.

CAUTION

PERSONAL INJURY HAZARD Failure to follow this caution may result in personal injury. Sheet metal parts may have sharp edges or burrs. Use care and wear appropriate protective clothing, safety glasses and gloves when handling parts and servicing air conditioning equipment.

WARNING

CARBON-MONOXIDE POISONING HAZARD Failure to follow instructions could result in severe personal injury or death due to carbon-monoxide poisoning, if combustion products infiltrate into the building. Check that all openings in the outside wall around the vent (and air intake) pipe(s) are sealed to prevent infiltration of combustion products into the building. Check that furnace vent (and air intake) terminal(s) are not obstructed in any way during all seasons.

AVERTISSEMENT

RISQUE DINTOXICATION AU MONOXYDE DE CARBONE Si ces directives ne sont pas suivies, cela peut entraner des blessures graves ou une intoxication au monoxyde de carbone pouvant causer la mort, si des produits de combustion sinfiltrent dans le btiment. Vrifier que toutes les ouvertures pratiques dans le mur extrieur autour du ou des tuyaux dvent (et de la prise dair) sont scelles de manire empcher linfiltration de produits de combustion dans le btiment. Veiller ce que la ou les sorties de lvent de lappareil de chauffage (et la prise dair) ne soient, en aucune faon, obstrues, quelle que soit la saison.

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GENERAL See Fig. 1-16 for unit options and dimensions.

Rated Indoor Airflow (CFM) Table 1 lists the rated indoor airflow used for the AHRI efficiency rating for the units covered in this document.

Table 1 Rated Indoor Airflow

WARNING

FIRE HAZARD Failure to follow this warning could result in severe personal injury and/or property damage. Inlet pressure tap set screw must be tightened and 1/8-in. NPT pipe plug must be installed to prevent gas leaks.

GAS VALVE

INLET PRESSURE TAP SET SCREW

WARNING

FIRE HAZARD Failure to follow this warning could result in severe personal injury and/or property damage. Manifold pressure tap set screw must be tightened and 1/8-in. NPT pipe plug must be installed to prevent gas leaks.

MODEL NUMBER FULL LOAD AIRFLOW (CFM)

48HC**17 4900 48HC**20 5700 48HC**24 6500 48HC**28 8125

MANIFOLD

GAS VALVE

MANIFOLD PRESSURE TAP SET SCREW

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Fig. 1 48HC 17-28 Model Number Nomenclature (Example)

Model Series - WeatherMaster

HC = High Efficiency

Unit Heat Type 48 = Gas Heat Packaged Rooftop

Cooling Tons 17 = 15 tons 20 = 17.5 tons 24 = 20 tons 28 = 25 tons

Heat Options D = Low Gas Heat E = Medium Gas Heat F = High Gas Heat S = Low Heat w/ Stainless Steel Exchanger R = Medium Heat w/ Stainless Steel Exchanger T = High Heat w/ Stainless Steel Exchanger

Sensor Options A = None B = RA Smoke Detector C = SA Smoke Detector D = RA + SA Smoke Detector E = CO Sensor2

F = RA Smoke Detector and CO2

G = SA Smoke Detector and CO2

H = RA + SA Smoke Detector and CO2

J = Condensate Overflow Switch K = Condensate Overflow Switch and RA Smoke Detectors L = Condensate Overflow Switch and RA and SA Smoke Detectors

Indoor Fan Options & Air Flow Configuration 1 = Standard Static/Vertical Supply, Return Air Flow 2 = Medium Static/Vertical Supply, Return Air Flow 3 = High Static/Vertical Supply, Return Air Flow B = Medium Static, High Efficiency Motor/Vertical Supply, Return Air Flow C = High Static, High Efficiency Motor/Vertical Supply, Return Air Flow 5 = Standard Static/Horizontal Supply, Return Air Flow 6 = Medium Static/Horizontal Supply, Return Air Flow 7 = High Static/Horizontal Supply, Return Air Flow F = Medium Static, High Efficiency Motor/Horizontal Supply, Return Air Flow G = High Static, High Efficiency Motor/Horizontal Supply, Return Air Flow

Refrig. Systems Options D = Two stage cooling model with Round Tube/Plate Fin E = Two stage cooling models with Humidi-MiZer System G = Two stage cooling models with Motormaster Low Ambient controller

Coil Options RTPF (Outdoor Indoor Hail Guard) A = Al/Cu Al/Cu B = Precoat Al/Cu Al/Cu C = E-coat Al/Cu Al/Cu D = E-coat Al/Cu E-coat Al/Cu E = Cu/Cu Al/Cu F = Cu/Cu Cu/Cu M = Al/Cu Al/Cu Louvered Hail Guard N = Precoat Al/Cu Al/Cu Louvered Hail Guard P = E-coat Al/Cu Al/Cu Louvered Hail Guard Q = E-coat Al/Cu E-coat Al/Cu Louvered Hail Guard R = Cu/Cu Al/Cu Louvered Hail Guard S = Cu/Cu Cu/Cu Louvered Hail Guard

Voltage 1 = 575/3/60 5 = 208-230/3/60 6 = 460/3/60

Design Revision - = Factory Design Revision

Base Unit Controls 0 = Electro-mechanical Controls. Can be used with W7212 EconoMi$er IV (Non-Fault Detection and Diagnostic) 1 = PremierLink Controller 2 = RTU Open Multi-Protocol Controller 6 = Electro-mechanical w/ 2-Speed Fan and W7220 Economizer Controller. Can be used with W7220 EconoMi$er X (with Fault Detection and Diagnostic) D = ComfortLink Controls (Standard with EnergyX)

Intake / Exhaust Options A = None B = Temperature Economizer w/ Barometric Relief F = Enthalpy Economizer w/ Barometric Relief K = 2-Position Damper P = Manual Outdoor Air Damper

U = Temp Ultra Low Leak Economizer w/ Barometric Relief V = Temp Ultra Low Leak Economizer w/ Power Exhaust - Vertical Air Only W = Enthalpy Ultra Low Leak Economizer w/ Barometric Relief X = Enthalpy Ultra Low Leak Economizer w/ Power Exhaust

- Vertical Air Only

Service Options 0 = None 1 = Unpowered Convenience Outlet 2 = Powered Convenience Outlet 3 = Hinged Panels 4 = Hinged Panels & Unpowered Convenience Outlet 5 = Hinged Panels & Powered Convenience Outlet C = Foil Faced Insulation

Packaging 0 = Standard

Electrical Options A = None B = HACR Breaker C = Non-Fused Disconnect G = 2-Speed Indoor Fan (VFD) Controller

J = 2 Speed Fan Controller (VFD) and Non-Fused Disconnect

48 HC D E 17 A 2 A 6 - 0 A 3 B 0

Q = EnergyX Only R = EnergyX with Economizer Only S = EnergyX with Frost Protection Only T = EnergyX with Economizer and Frost Protection

H = 2-Speed Indoor Fan (VFD) Controller and HACR Breaker

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Fig. 2 48HC**17 Vertical Airflow

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Fig. 3 48HC**17 Horizontal Airflow

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Fig. 4 48HC**17 Back View and Condensate Drain Location

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Fig. 5 48HC**17 Corner Weights and Clearances

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Fig. 6 48HC**17 Bottom View

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Fig. 7 48HC**20-24 Vertical Airflow

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Fig. 8 48HC**20-24 Horizontal Airflow

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Fig. 9 48HC**20-24 Back View and Condensate Drain Location

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Fig. 10 48HC**20-24 Corner Weights and Clearances

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Fig. 11 48HC**20-24 Bottom View

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Fig. 12 48HC**28 Vertical Airflow

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Fig. 13 48HC**28 Horizontal Airflow

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Fig. 14 48HC**28 Back View and Condensate Drain Location

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Fig. 15 48HC**28 Corner Weights and Clearances

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Fig. 16 48HC**28 Bottom View

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INSTALLATION

Jobsite Survey Complete the following checks before installation. 1. Consult local building codes and the NEC (National

Electrical Code) ANSI/NFPA 70 for special installation requirements.

2. Determine unit location (from project plans) or select unit location.

3. Check for possible overhead obstructions which may inter- fere with unit lifting or rigging.

Step 17 Plan for Unit Location Select a location for the unit and its support system (curb or other) that provides for at least the minimum clearances required for safety. This includes the clearance to combustible surfaces, unit performance and service access below, around and above unit as specified in unit drawings. See Fig. 5, 10, and 15. NOTE: Consider also the effect of adjacent units. Be sure that the unit is installed such that snow will not block the combustion air intake or flue outlet. Unit may be installed directly on wood flooring or on Class A, B, or C roof-covering material when roof curb is used. Do not install unit in an indoor location. Do not locate air inlets near exhaust vents, relief valves, or other sources of contaminated air. For proper unit operation, adequate combustion and ventila- tion air must be provided in accordance with Section 5.3 (Air for Combustion and Ventilation) of the National Fuel Gas Code, ANSI Z223.1 (American National Standards Institute) and NFPA (National Fire Protection Association) 54 TIA-54-84-1. In Cana- da, installation must be in accordance with the CAN1-B149 instal- lation codes for gas burning appliances. Although unit is weatherproof, avoid locations that permit water from higher level runoff and overhangs to fall onto the unit. Locate mechanical draft system flue assembly at least 4 ft (1.2 m) from any opening through which combustion products could enter the building, and at least 4 ft (1.2 m) from any adjacent building (or per local code). Locate the flue assembly at least 10 ft (3.05 m) from an adjacent units fresh air intake hood if within 3 ft (0.91 m) of same elevation (or per local code). When unit is located adja- cent to public walkways, flue assembly must be at least 7 ft (2.1 m) above grade. Select a unit mounting system that provides adequate height to al- low installation of condensate trap per requirements. Refer to Step 11 Install External Condensate Trap and Line for required trap dimensions. ROOF MOUNT Check building codes for weight distribution requirements. Unit operating weight is shown in Table 2.

Step 18 Plan for Sequence of Unit Installation The support method used for this unit will dictate different se- quences for the steps of unit installation. For example, on curb- mounted units, some accessories must be installed on the unit be- fore the unit is placed on the curb. Review the following for rec- ommended sequences for installation steps. CURB-MOUNTED INSTALLATION 1. Install curb 2. Install field-fabricated ductwork inside curb 3. Install accessory thru-base service connection package

(affects curb and unit) 4. Rig and place unit 5. Remove top skid 6. Install outside air hood 7. Install smoke detector tube 8. Install combustion air hood 9. Install flue hood 10. Install gas piping 11. Install condensate line trap and piping 12. Make electrical connections 13. Install other accessories

PAD-MOUNTED INSTALLATION 1. Prepare pad and unit supports 2. Rig and place unit 3. Remove duct covers and top skid 4. Install smoke detector return air sensor tube 5. Install field-fabricated ductwork at unit duct openings 6. Install outside air hood 7. Install combustion air hood 8. Install flue hood 9. Install gas piping 10. Install condensate line trap and piping 11. Make electrical connections 12. Install other accessories

FRAME-MOUNTED INSTALLATION Frame-mounted applications generally follow the sequence for a curb installation. Adapt as required to suit specific installation plan.

Table 2 Operating Weights

48HC** UNITS LB (KG) 17 20 24 28

Base Unit 1892 (858) 2102 (954) 2247 (1019) 2292 (1040) Economizer 246 (112) 246 (112) 246 (112) 246 (112) Powered Outlet 35 (16) 35 (16) 35 (16) 35 (16) Humidi-MiZer System 110 (50) 120 (54) 120 (54) 120 (54) Curb

14 in. (356 mm) 240 (109) 255 (116) 255 (116) 273 (124) 24 in. (610 mm) 340 (154) 355 (161) 355 (161) 355 (161)

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Step 19 Inspect Unit Inspect unit for transportation damage. File any claim with trans- portation agency. Confirm before installation of unit that voltage, amperage and cir- cuit protection requirements listed on unit data plate agree with power supply provided. On units with hinged panel option, check to be sure all latches are tight and in closed position. Locate the carton containing the outside air hood parts; see Fig. 18 and 24. Do not remove carton until unit has been rigged and locat- ed in final position.

Step 20 Provide Unit Support ROOF CURB MOUNT Accessory roof curb details and dimensions are shown in Fig. 19- 21. Assemble and install accessory roof curb in accordance with instructions shipped with the curb. NOTE: The gasketing of the unit to the roof curb is critical for a watertight seal. Install gasket supplied with the roof curb as shown in Fig. 19-21. Improperly applied gasket can also result in air leaks and poor unit performance. Curb should be level. This is necessary for unit drain to function properly. Unit leveling tolerances are shown in Fig. 17. Refer to Accessory Roof Curb Installation Instructions for additional infor- mation as required.

Fig. 17 Unit Leveling Tolerances

Install insulation, cant strips, roofing felt, and counter flashing as shown. Ductwork must be attached to curb and not to the unit. Thru-the-base power connection must be installed before the unit is set on the roof curb. If field-installed thru-the-roof curb gas con- nections are desired remove knockout in basepan located in the gas section, see Fig. 18 for location. Gas connections and power connections to the unit must be field installed after the unit is in- stalled on the roof curb. If electrical and control wiring is to be routed through the basepan, remove the knockouts in the basepan located in the control box ac- cess area (see Fig. 18). For basepan knockout locations for vertical airflow units see Fig. 2, 7, or 12; for horizontal airflow units see Fig. 3, 8, or 13.

Fig. 18 Typical Access Panel and Compressor Locations

SLAB MOUNT (HORIZONTAL UNITS ONLY) Provide a level concrete slab that extends a minimum of 6 in. (150 mm) beyond unit cabinet. Install a gravel apron in front of condenser coil air inlet to prevent grass and foliage from obstruct- ing airflow. NOTE: Horizontal units may be installed on a roof curb if re- quired. ALTERNATE UNIT SUPPORT (IN LIEU OF CURB OR SLAB MOUNT) A non-combustible sleeper rail can be used in the unit curb sup- port area. If sleeper rails cannot be used, support the long sides of the unit with a minimum of 3 equally spaced 4 in. x 4 in. (102 mm x 102 mm) pads on each side. Locate pads so that they support the rails. Make sure to avoid the fork openings.

MAXIMUM ALLOWABLE DIFFERENCE IN. (MM) A-B B-C A-C

0.25 (6) 0.5 (12) 0.5 (12)

A

B

C

CONTROL BOX ACCESS PANEL

FILTER AND INDOOR COIL

ACCESS PANEL

INDOOR BLOWER ACCESS PANEL

GAS HEAT ACCESS PANEL COMPRESSOR

(EACH SIDE)

HOOD CARTON LOCATION (REAR ACCESS PANEL)

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Fig. 19 Roof Curb Details 17 Size Unit

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Fig. 20 Roof Curb Details 20 and 24 Size Units

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Fig. 21 Roof Curb Details 28 Size Unit

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Step 21 Field Fabricate Ductwork Cabinet return-air static pressure (a negative condition) shall not exceed 0.5 in. wg (87 Pa) with economizer or without economizer. For vertical ducted applications, secure all ducts to roof curb and building structure. Do not connect ductwork to unit. Fabricate supply ductwork so that the cross sectional dimensions are equal to or greater than the unit supply duct opening dimen- sions for the first 18 in. (458 mm) of duct length from the unit basepan. Insulate and weatherproof all external ductwork, joints, and roof openings with counter flashing and mastic in accordance with ap- plicable codes. Ducts passing through unconditioned spaces must be insulated and covered with a vapor barrier. If a plenum return is used on a vertical unit, the return should be ducted through the roof deck to comply with applicable fire codes. A minimum clearance is not required around ductwork.

Step 22 Rig and Place Unit Keep unit upright and do not drop. Spreader bars are not required if top crating is left on unit. Rollers may be used to move unit across a roof. Level by using unit frame as a reference. See Table 2 (on page 20) and Fig. 22 for additional information. Lifting holes are provided in base rails as shown in Fig. 19-21. Re- fer to rigging instructions on unit.

Before setting the unit onto the curb, recheck gasketing on curb.

Fig. 22 Rigging Details

CAUTION

PROPERTY DAMAGE HAZARD Failure to follow this caution may result in damage to roofing materials. Membrane roofs can be cut by sharp sheet metal edges. Be careful when placing any sheet metal parts on such roof.

CAUTION

UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage. All panels must be in place when rigging. Unit is not designed for handling by fork truck when packaging is removed. If using top crate as spreader bar, once unit is set, carefully lower wooden crate off building roof top to ground. Ensure that no people or obstructions are below prior to lowering the crate.

NOTES: 1. Dimensions in ( ) are in millimeters. 2. Hook rigging shackles through holes in base rail, as shown in detail A. Holes in base

rails are centered around the unit center of gravity. Use wooden top to prevent rigging straps from damaging unit.

UNIT MAX WEIGHT DIMENSIONS A B C

lb kg in. mm in. mm in. mm 48HC**17 2339 1061 127.8 3249 58.7 1491 52.3 1328 48HC**20 2549 1156 141.5 3595 71.5 1816 52.3 1328 48HC**24 2699 1224 141.5 3595 71.5 1816 60.3 1532 48HC**28 2748 1246 157.8 4007 80.3 2040 60.3 1532

B

C

A

(914-1371) 36"-54"

DETAIL A

SEE DETAIL A

PLACE ALL SEAL STRIPS IN PLACE BEFORE PLACING UNIT ON ROOF CURB.

DUCT END

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POSITIONING ON CURB Position unit on roof curb so that the following clearances are maintained: 1/4 in. (6 mm) clearance between the roof curb and the base rail inside the right and left, 1/2 in. (12 mm) clearance be- tween the roof curb and the base rail inside the front and back. This will result in the distance between the roof curb and the base rail inside on the condenser end of the unit being approximately equal to Details A and B in Fig. 19-21. Do not attempt to slide unit on curb after unit is set. Doing so will result in damage to the roof curb seal. Although unit is weatherproof, guard against water from higher level runoff and overhangs. Flue vent discharge must have a minimum horizontal clearance of 48 in. (1220 mm) from electric and gas meters, gas regulators, and gas relief equipment. Minimum distance between unit and other electrically live parts is 48 in. (1220 mm). Flue gas can deteriorate building materials. Orient unit such that flue gas will not affect building materials. Locate mechanical draft system flue assembly at least 48 in. (1220 mm) from an adjacent building or combustible material. After unit is in position, remove rigging skids and shipping materials.

Step 23 Horizontal Duct Connection Depending on the unit size, see either Fig. 3 and 4 (size 17), Fig. 8 and 9 (sizes 20 and 24), or Fig. 13 and 14 (size 28) for locations and sizes of the horizontal duct connections. Note that there are 2 different return air duct connection locations one for unit with- out an economizer (on back side of unit) and a different one for unit equipped with an economizer (on left end, under the econo- mizer hood). The supply air duct connection is on the back side. See Fig. 23 for top view depicting typical horizontal duct arrangements. NOTE: 48HC size 17 to 28 units are factory assembled as either dedicated horizontal or vertical units. These units cannot be field converted.

Fig. 23 Horizontal Duct Opening Dimensions

Field-supplied (3/4 in.) flanges should be attached to horizontal duct openings (see Fig. 23) and all ductwork should be secured to the flanges. Insulate and weatherproof all external ductwork, joints, and roof or building openings with counter flashing and mastic in accordance with applicable codes.

Step 24 Install Outside Air Hood - Factory Option The outside air hood for factory-option economizer and 2-position damper is shipped in knock-down form and requires field assem- bly. The panel for the hood top is shipped on the end of the unit (see Fig. 24). The remaining parts for the hood assembly (includ- ing side panels, filters and tracks) are shipped in a carton that is se- cured to the rear of the blower assembly. Access the carton loca- tion through rear panel (see Fig. 25).

Fig. 24 Hood Top Shipping Position

Fig. 25 Hood Package Shipping Location

To remove the hood parts package: 1. Remove the back blower access panel. 2. Locate and cut the strap, being careful to not damage any

wiring. 3. Carefully lift the hood package carton through the back

blower access opening. To assemble the outside air hood (see Fig. 26 for hood compo- nent locations): 1. Remove hood top panel from shipping position on unit end. 2. Install filters supports (Item #1) to the upper end panel using

the screws provided. 3. Install each deflector (Item #8) on to each filter support

(Item #1) using the screws provided. 4. Apply seal strip to mating flanges on side plates of hood

(Items #4 and #5). 5. Secure side panels (Items #4 and #5) to upper panel using the

screws provided. 6. Apply seal strip to mating flange of the hood (see Fig. 26). 7. Secure hood top (Item #3) to upper panel using the screws

provided. (On 44-in. chassis, remove the screws from across top cover of unit. The rear flange of hood top will slide behind unit top over flange.)

LOCATION SUPPLY RETURN WITHOUT

ECONOMIZER RETURN WITH ECONOMIZER

Back Back Left End Height - in. (mm) 15-7/8 (402) 49-3/8 (1253) 18-3/8 (467) Width - in. (mm) 29-3/4 (756) 23-3/8 (593) 61-5/8 (1564)

RETURN AIR DUCT WITH ECONOMIZER

RETURN AIR DUCT WITHOUT

ECONOMIZER

HORIZONTAL SUPPLY AIR

HOOD TOP SHIPPING POSITION

HOOD PACKAGE

27

8. Secure side retainers (Item #6) to side panels (Items #4 and #5) using the screws provided, screwing from outside of the hood.

9. Secure each central retainer (Item #2) to the hood top (Item #3). Then align central retainers to holes located on fil- ter support (Item #1), so central retainer is perpendicular to hood and each filter support. Secure using screws provided.

10. Apply seal strip to top diverters (Item #7). 11. Secure top diverters (Item #7) to hood top (Item #3). 12. Install outdoor air screens by sliding them into each of the

four spaces created by the hood, filter support and central retainers. To do so, first insert the air screens into pocket cre- ated at the end of hood (Item #3), then fully put the air screen into place, and then slide them back into pocket created in the filter support (Item #1). Repeat this for each air screen (see Fig. 27). See Fig. 28 for completed hood assembly.

Fig. 26 Hood Part Identification and Seal Strip Application Areas

Fig. 27 Outdoor Air Screen Installation

Fig. 28 Completed Hood Assembly

Step 25 Assemble Barometric Hood The barometric hood can be assembled in vertical or horizontal configuration. Figure 29 illustrates the barometric hood parts.

Fig. 29 Barometric Hood Parts

BAROMETRIC HOOD (VERTICAL CONFIGURATION) 1. Remove the hood top panel from its shipping position on the

unit end (see Fig. 30).

Fig. 30 Shipping Location, Vertical Units

2. Remove the side panels located in the hood parts box (see Fig. 31).

Apply seal strip to the front of this flange

Apply seal strip to the back of this flange

Apply seal strip to the back of this flange Apply seal strip

to the back of this flange7

7 3

5 6 8 8

2 8

6

4

2

12

ITEM # DESCRIPTION QTY 1 Filter Supports 3 2 Central Retainer 3 3 Hood Top 1 4 Left Hood Side 1 5 Right Hood Side 1 6 Side Retainer 2 7 Top Diverters 2 8 Deflector 3

Insert Air Screen

Slide Into Position

28

Fig. 31 Barometric Hood Box Parts Location

3. Install parts as shown in the following exploded view (see Fig. 32) using the seal strip and screws provided in the parts box.

Fig. 32 Barometric Hood Exploded View

Figure 33 illustrates the installed barometric hood parts.

Fig. 33 Installed Barometric Hood Side View and Isometric View

BAROMETRIC HOOD (HORIZONTAL CONFIGURATION) For horizontal return and field installed economizer, install the economizer as follows:

1. Install the field provided horizontal ductwork onto the unit. Duct height must be at least 19-1/2 in. high, however the duct can be no taller than the top of the relief opening in the bot- tom panel, or airflow into the outside air hood will be restricted. See Fig. 34.

Fig. 34 Relief Damper

2. Cut a 16 in. x 36 in. opening in the return duct for the relief damper (see Fig. 34).

3. On the field installed economizer (CRECOMZR0**A00), a birdscreen or hardware cloth is shipped attached to the bot- tom panel used for vertical applications.

NOTE: This panel is not used for horizontal return applications. Remove the screen from the provided panel and install it over the relief opening cut in return duct. 4. Using the blade brackets, install the relief damper onto the

side of the return duct (see Fig. 35). The two brackets and relief damper are provided with the economizer.

Fig. 35 Installing CRBARHOD001A00 Over Relief Damper

5. Using the provided hardware, screw the CRBARHOD001A00 hood sides and top together (see Fig. 36).

Unit

Outside Air Hood

Min 19 1/2"

Relief Opening

Return Duct

16"

1"

18 3/8"

29

Fig. 36 CRBARHOD001A00 Hood Sides and Top

Caulk the backside of the mating flanges to ensure a watertight seal. Install the CRBARHOD001A00 over the relief damper and screw to the return duct, as illustrated in Fig. 35.

Step 26 Install Flue Hood and Combustion Air Hood The flue hood is shipped screwed to the fan deck inside the burner compartment. Remove the burner access panel and then remove the flue hood from its shipping location. Using the screws provid- ed, install flue hood and screen in location shown in Fig. 37. The combustion air hood is attached to the back of the burner ac- cess panel. Remove the 2 screws securing the hood to the back of the burner access panel. Using the 2 screws, re-attach the hood to the front of the burner access panel as shown in Fig. 18.

Fig. 37 Flue Hood and Combustion Air Hood Details

Step 27 Install Gas Piping Installation of the gas piping must be in accordance with local building codes and with applicable national codes. In U.S.A., refer to NFPA 54/ANSI Z223.1 National Fuel Gas Code (NFGC). In Canada, installation must be in accordance with the CAN/CSA B149.1 and CAN/CSA B149.2 installation codes for gas burning appliances. This unit is factory equipped for use with Natural Gas fuel at ele- vations up to 2000 ft (610 m) above sea level. Unit may be field converted for operation at elevations above 2000 ft (610 m) and/or for use with liquefied petroleum fuel. See accessory kit installation instructions regarding these accessories. NOTE: Furnace gas input rate on rating plate is for installation up to 2000 ft (610 m) above sea level. The input rating for altitudes above 2000 ft (610 m) must be derated by 4% for each 1000 ft (305 m) above sea level. For natural gas applications, gas pressure at unit gas connection must not be less than 5 in. wg (1246 Pa) or greater than 13 in. wg (3240 Pa) while the unit is operating. For liquefied petroleum ap- plications, the gas pressure must not be less than 11 in. wg (2740 Pa) or greater than 13 in. wg (3240 Pa) at the unit connec- tion. GAS SUPPLY LINE The gas supply pipe enters the unit adjacent to the burner access panel on the front side of the unit, through the grommeted hole. The gas connection to the unit is made to the 3/4 in. FPT gas inlet port on the unit gas valve. Table 3 lists typical 3/4 in. NPT (National Pipe Thread) field sup- plied pipe fittings required for Thru-Base gas supply, starting from the unit gas valve (see Fig. 38). Pipe gas supply into 90 degree elbow item 15 (see Table 3) through the hole in the unit basepan. For typical 3/4 in. NPT field-supplied fittings without Thru-Base gas supply, requirements starting from the unit gas valve, omit items 14 and 15 from Table 3 and pipe gas supply into the tee. See Fig. 39.

FLUE HOOD COMBUSTION

AIR HOOD

30

Table 3 Typical 3/4 in. NPT Field Supplied Piping Parts

Table 4 Natural Gas Supply Line Pressure Ranges

Install a gas supply line that runs to the unit heating section. Refer to the NFPA 54/NFGC or equivalent code for gas pipe sizing data. Do not use a pipe smaller than the size specified. Size the gas sup- ply line to allow for a maximum pressure drop of 0.5 in. wg (124 Pa) between gas regulator source and unit gas valve connec- tion when unit is operating at high-fire flow rate. The gas supply line can approach the unit in 2 ways: horizontally from outside the unit (across the roof), or through unit basepan. Observe clearance to gas line components per Fig. 40.

Fig. 38 Gas Supply Line Piping with Thru-Base

Fig. 39 Gas Supply Line Piping

Fig. 40 Gas Piping Guide

FACTORY OPTION THRU-BASE CONNECTIONS Electrical Connections Knockouts are located in the control box area. Remove the appro- priate size knockout for high voltage connection. Use the field supplied connector depending on wiring or conduit being utilized. Remove the 7/8 in. (22 mm) knockout and appropriate connector for low voltage wiring. If non-unit powered convenience outlet is being utilized, remove the 7/8 in. (22 mm) knockout and utilize appropriate connector for 115 volt line. See Step 12 Make Electrical Connections for details. Gas Connections Remove the knockout in the base pan and route 3/4 in. gas line up through the opening. Install an elbow and route gas line through opening in panel after first removing plastic bushing. Install a gas shut off followed by a drip leg and ground-joint union. Route gas line into gas section through the grommet (Part #: KA56SL112) at the gas inlet and into the gas valve. See Fig. 38 and Table 3. If a regulator is installed, it must be located 4 ft (1.22 meters) from the flue outlet.

ITEM QTY CPN DESCRIPTION 1 1 CA15RA201 90 Deg Street Elbow 2 1 CA01CA226 5 in. Long Nipple 3 1 CA85RA201 Ground Joint Union 4 1 CA01CA218 3 in. Long Nipple 5 1 CA05RA201 90 Deg Elbow 6 1 CA01CA250 12 in. Long Nipple 7 1 CA05RA201 90 Deg Elbow 8 1 CA01CA218 3 in. Long Nipple 9 1 CA20RA201 TEE 10 1 CA01CN222 4 in. Long Nipple (Sediment Trap) 11 1 CA38RA201 Cap 12 1 CA01CA220 3-1/2 in. Long Nipple 13 1 GB30 NIBCO Ball Valve 14 1 CA01CA238 8 in. Long Nipple 15 1 CA05RA201 90 Deg Elbow

UNIT MODEL UNIT SIZE MIN MAX

48HC** 17, 20, 24, 28 5.0 in. wg (1246 Pa)

13.0 in. wg (3240 Pa)

CAUTION

EQUIPMENT DAMAGE Failure to follow this caution may result in equipment damage. When connecting the gas line to the unit gas valve, the installer MUST use a backup wrench to prevent damage to the valve.

15

14 13

12 11

10

9

8

7

6 5 4 3 2

1

13

12

11

10

9

8

7

6 5 4 3 2

1

STEEL PIPE NOMINAL DIAMETER (in.)

SPACING OF SUPPORTS X DIMENSION (ft)

1/2 6 3/4 or 1 8

1-1/4 or larger 10

LEGEND NFGC National Fuel Gas Code * Field supplied.

NOTE: Follow all local codes.

X

BASE UNIT

BASE RAIL ROOF CURB

9 MINIMUM CLEARANCE FOR PANEL REMOVAL

MANUAL GAS SHUTOFF VALVE*

GAS REGULATOR*

48 MINIMUM

DRIP LEG PER NFGC*

FIELD- FABRICATED SUPPORT*

FROM GAS METER

31

Some municipal codes require that the manual shutoff valve be lo- cated upstream of the sediment trap. See Fig. 39 for typical piping arrangements for gas piping that has been routed through the side- wall of the base pan. When installing the gas supply line, observe local codes pertaining to gas pipe installations. Refer to the NFPA 54/ANSI Z223.1 NFGC latest edition (in Canada, CAN/CSA B149.1). In the ab- sence of local building codes, adhere to the following pertinent recommendations: 1. Avoid low spots in long runs of pipe. Grade all pipe 1/4 in.

every 15 ft (7 mm in every 5 m) to prevent traps. Grade all horizontal runs downward to risers. Use risers to connect to heating section and to meter.

2. Protect all segments of piping system against physical and thermal damage. Support all piping with appropriate straps, hangers, etc. Use a minimum of one hanger every 6 ft (1.8 m). For pipe sizes larger than 1/2 in., follow recommen- dations of national codes.

3. Apply joint compound (pipe dope) sparingly and only to male threads of joint when making pipe connections. Use only pipe dope that is resistant to action of liquefied petro- leum gases as specified by local and/or national codes. If using PTFE (Teflon1) tape, ensure the material is Double Density type and is labeled for use on gas lines. Apply tape per manufacturers instructions.

4. Pressure-test all gas piping in accordance with local and national plumbing and gas codes before connecting piping to unit.

NOTE: Pressure test the gas supply system after the gas supply piping is connected to the gas valve. The supply piping must be disconnected from the gas valve during the testing of the piping systems when test pressure is in excess of 0.5 psig (3450 Pa). Pres- sure test the gas supply piping system at pressures equal to or less than 0.5 psig (3450 Pa). The unit heating section must be isolated from the gas piping system by closing the external main manual shutoff valve and slightly opening the ground-joint union. Check for gas leaks at the field-installed and factory-installed gas lines after all piping connections have been completed. Use soap- and-water solution (or method specified by local codes and/or regulations).

If orifice hole appears damaged or it is suspected to have been re- drilled, check orifice hole with a numbered drill bit of correct size. Never re-drill an orifice. A burr-free and squarely aligned orifice hole is essential for proper flame characteristics. See Fig. 41.

Fig. 41 Orifice Hole

Step 28 Install External Condensate Trap and Line The unit has one 3/4 in. condensate drain connection on the end of the condensate pan (see Fig. 42). See Fig. 4, 9, and 14 for the loca- tion of the condensate drain connection.

Fig. 42 Condensate Drain Pan Connection

The piping for the condensate drain and external trap can be com- pleted after the unit is in place. Hand tighten fittings to the drain pan fitting. Provide adequate support for the drain line. Failure to do so can result in damage to the drain pan. See Fig. 43.

1. Teflon is a registered trademark of DuPont.

WARNING

Failure to follow this warning could result in personal injury, death and/or property damage. Connect gas pipe to unit using a backup wrench to

avoid damaging gas controls. Never purge a gas line into a combustion chamber. Never test for gas leaks with an open flame. Use a

commercially available soap solution made specifically for the detection of leaks to check all connections.

Use proper length of pipe to avoid stress on gas control manifold.

BURNER ORIFICE

Condensate Drain Connection

32

Fig. 43 Condensate Drain Piping Details

All units must have an external trap for condensate drainage. In- stall a trap at least 4 in. (102 mm) deep and protect against freeze- up. If drain line is installed downstream from the external trap, pitch the line away from the unit at 1 in. per 10 ft (25 mm in 3 m) of run. Do not use a pipe size smaller than the unit connection (3/4 in.).

Step 29 Make Electrical Connections

NOTE: Field-supplied wiring shall conform with the limitations of minimum 63F (3C) rise. FIELD POWER SUPPLY If equipped with optional powered convenience outlet: the power source leads to the convenience outlets transformer primary are not factory connected. Installer must connect these leads accord- ing to required operation of the convenience outlet. If an always- energized convenience outlet operation is desired, connect the source leads to the line side of the unit-mounted disconnect. (Check with local codes to ensure this method is acceptable in your area.) If a de-energize via unit disconnect switch operation of the convenience outlet is desired, connect the source leads to the load side of the unit disconnect. On a unit without a unit-mounted disconnect or HACR, connect the source leads to the terminal block with unit field power leads. See Fig. 44.

Fig. 44 Location of TB1

Field power wires are connected to the unit at line-side pressure lugs on the terminal block (see wiring diagram label for control box component arrangement) or at factory-installed option non- fused disconnect switch or HACR breaker. Use copper conductors only. See Fig. 45. NOTE: Make field power connections directly to line connection pressure lugs only.

Fig. 45 Disconnect Switch and Unit

UNITS WITHOUT FACTORY-INSTALLED NON-FUSED DISCONNECT OR HACR When installing units, provide a disconnect switch of adequate size per NEC (National Electrical Code). Disconnect sizing data is provided on the unit informative plate. Locate on unit cabinet or within sight of the unit per national or local codes. Do not cover unit informative plate if mounting the disconnect on the unit cabinet.

WARNING

Failure to follow this warning could result in personal injury or death. Do not use gas piping as an electrical ground. Unit cabinet must have an uninterrupted, unbroken electrical ground to minimize the possibility of personal injury if an electrical fault should occur. This ground may consist of electrical wire connected to unit ground lug in control compartment, or conduit approved for electrical ground when installed in accordance with NEC (National Electrical Code); ANSI/NFPA 70, latest edition (in Canada, Canadian Electrical Code CSA [Canadian Standards Association] C22.1), and local electrical codes.

NOTE: Trap should be deep enough to offset maximum unit static difference. A 4-in. (102 mm) trap is recommended.

MINIMUM PITCH 1 (25 mm) PER 10 (3 m) OF LINE

BASE RAIL

OPEN VENT

TO ROOF DRAIN

DRAIN PLUG

ROOF CURB

SEE NOTE

3 (76 mm) MIN

WARNING

FIRE HAZARD Failure to follow this warning could result in personal injury, death, or property damage. Do not connect aluminum wire between disconnect switch and unit. Use only copper wire.

LOAD SIDE

SEE DETAIL A

DETAIL A

LINE SIDE

BLK YEL

BLU

CONTROL BOX

L3 L2

L1

COPPER

WIRE ONLY

ELECTRIC DISCONNECT

SWITCH

ALUMINUM WIRE

33

UNITS WITH FACTORY-INSTALLED NON-FUSED DIS- CONNECT OR HACR The factory-installed option non-fused disconnect switch (NFD) or HACR is located in the main control box. The manual switch handle and shaft are shipped in the control box and must be mounted on the corner post adjacent to the control box (see Fig. 46 or 47). Note that the tape covering the hole for the shaft in the cor- ner post must be removed prior to handle and shaft installation. To field install the NFD shaft and handle: 1. Open the control box panel. 2. Make sure the NFD shipped from the factory is at OFF posi-

tion (the arrow on the black handle knob or on the silver metal collar is at OFF).

3. Insert the shaft with the cross pin on the top of the shaft in the horizontal position.

4. Measure the tip of the shaft to the outside surface of the cor- ner post to be 0.88 inches.

5. Tighten the locking screw to secure the shaft to the NFD. 6. Turn the handle to the OFF position with red arrow pointing

at OFF. 7. Install the handle on to the corner post vertically with the red

arrow pointing up. 8. Secure the handle to the corner post with (2) screws and lock

washers supplied.

Fig. 46 Handle and Shaft Assembly for NFD

To field install the HACR shaft and handle: 1. Open the control box panel. 2. Make sure the HACR shipped from the factory is at OFF

position (the white arrow pointing at OFF). 3. Insert the shaft all the way with the cross pin on the top of the

shaft in the horizontal position. 4. Measure the tip of the shaft to the outside surface of the cor-

ner post to be 0.88 inches. 5. Tighten the locking screw to secure the shaft to the HACR. 6. Turn the handle to the OFF position with red arrow pointing

at OFF. 7. Install the handle on to the corner post vertically with the red

arrow pointing up. 8. Secure the handle to the corner post with (2) screws and lock

washers supplied.

Fig. 47 Handle and Shaft Assembly for HACR

34

ALL UNITS All field wiring must comply with NEC and all local require- ments. Size wire based on MCA (Minimum Circuit Amps) on the unit in- formative plate. See Fig. 48 for power wiring connections to the unit power terminal blocks and equipment ground. Maximum wire size is 2/0 AWG per pole. Provide a ground-fault and short-circuit over-current protection device (fuse or breaker) per NEC Article 440 (or local codes). Refer to unit informative data plate for MOCP (Maximum Over- current Protection) device size. NOTE: Units ordered with factory installed HACR do not need an additional ground-fault and short-circuit over-current protection device unless required by local codes. Voltage to compressor terminals during operation must be within voltage range indicated on unit nameplate. On 3-phase units, volt- ages between phases must be balanced within 2% and the current within 10%. Use the formula shown below to determine the per- cent of voltage imbalance.

Example: Supply voltage is 230-3-60

Determine maximum deviation from average voltage.

(AB) 227-224 = 3 v

(BC) 231-227 = 4 v

(AC) 227-226 = 1 v

Maximum deviation is 4 v.

Determine percent of voltage imbalance.

This amount of phase imbalance is satisfactory as it is below the maximum allowable 2%.

Fig. 48 Power Wiring Connections

CONVENIENCE OUTLETS

Two types of convenience outlets are offered on 48HC models: non-powered and unit-powered. Both types provide a 125 volt GFCI (ground-fault circuit-interrupter) duplex receptacle rated at 15-A behind a hinged waterproof access cover, located on the pan- el beneath the control box. See Fig. 49.

Fig. 49 Convenience Outlet Location

% Voltage Imbalance = 100 x

max voltage deviation from average voltage average voltage

AB = 224 v BC = 231 v AC = 226 v

Average Voltage = (224 + 231 + 226)

= 681

= 227 3 3

% Voltage Imbalance = 100x 4

= 1.78% 227

IMPORTANT: If the supply voltage phase imbalance is more than 2%, contact your local electric utility company immediately.

CAUTION

UNIT DAMAGE HAZARD Failure to follow this caution may result in equipment damage. Operation on improper line voltage or excessive phase imbal- ance constitutes abuse and may cause damage to electrical components. Such operation would invalidate any applicable Carrier warranty.

A B C

MOTOR

WARNING

ELECTRICAL OPERATION HAZARD Failure to follow this warning could result in personal injury or death. Units with convenience outlet circuits may use multiple disconnects. Check convenience outlet for power status before opening unit for service. Locate its disconnect switch, if appropriate, and open it. Lock-out and tag-out this switch, if necessary.

11 13

L1 L2 L3 GROUND (GR)

TB1

208/230-3-60 460-3-60 575-3-60

T1 T2 T3

L1 L2 L3

L1 L2 L3

FACTORY WIRING

DISCONNECT PER NEC

OPTIONAL DISCONNECT

SWITCH OR HACR

12 EQUIP GR LUG

GROUND (GR)

EQUIP GR LUG

UNITS WITHOUT DISCONNECT OR HACR OPTION

UNITS WITH DISCONNECT OR HACR OPTION

CONVENIENCE OUTLET

ELECTRIC DISCONNECT

SWITCH

CONTROL BOX ACCESS PANEL

35

Installing Weatherproof Cover A weatherproof while-in-use cover for the factory-installed conve- nience outlets is now required by UL standards. This cover cannot be factory-mounted due its depth; it must be installed at unit instal- lation. For shipment, the convenience outlet is covered with a blank cover plate. The weatherproof cover kit is shipped in the units control box. The kit includes the hinged cover, a backing plate and gasket. DISCONNECT ALL POWER TO UNIT AND CONVE- NIENCE OUTLET. LOCK-OUT AND TAG-OUT ALL POWER. Remove the blank cover plate at the convenience outlet; discard the blank cover. Loosen the 2 screws at the GFCI duplex outlet, until approximate- ly 1/2 in. (13 mm) under screw heads are exposed. Press the gas- ket over the screw heads. Slip the backing plate over the screw heads at the keyhole slots and align with the gasket; tighten the 2 screws until snug (do not over-tighten). Mount the weatherproof cover to the backing plate as shown in Fig. 50. Remove 2 slot fillers in the bottom of the cover to permit service tool cords to exit the cover. Check for full closing and latching.

Fig. 50 Weatherproof Cover Installation

Non-powered type This type requires the field installation of a general-purpose 125 v 15-A circuit powered from a source elsewhere in the building. Ob- serve national and local codes when selecting wire size and con- duit requirements, fuse or breaker requirements and disconnect switch size and location. Route 125 v power supply conductors into the bottom of the utility box containing the duplex receptacle. Unit-powered type A unit-mounted transformer is factory-installed to stepdown the main power supply voltage to the unit to 115 v at the duplex recep- tacle. This option also includes a manual switch with fuse, located in a utility box and mounted on a bracket behind the con- venience outlet; access is through the units control box access panel. See Fig. 49. The primary leads to the convenience outlet transformer are not factory-connected. If local codes permit, the transformer primary leads can be connected at the line-side terminals on the unit- mounted non-fused disconnect switch; this will provide service power to the unit when the unit disconnect switch is open. See Fig. 51. See Fig. 52 for convenience outlet utilization notice.

Fig. 51 Powered Convenience Outlet Wiring

Fig. 52 Convenience Utilization Notice

Test the GFCI receptacle by pressing the TEST button on the face of the receptacle to trip and open the receptacle. Check for proper grounding wires and power line phasing if the GFCI receptacle does not trip as required. Press the RESET button to clear the tripped condition. Using unit-mounted convenience outlets Units with unit-mounted convenience outlet circuits will often re- quire that 2 disconnects be opened to de-energize all power to the unit. Treat all units as electrically energized until the convenience outlet power is also checked and de-energization is confirmed. Observe National Electrical Code Article 210, Branch Circuits, for use of convenience outlets.

COVER - WHILE-IN-USE WEATHERPROOF

BASEPLATE FOR GFCI RECEPTACLE

GASKET

GFCI RECEPTACLE NOT INCLUDED

TOP

TO P

TOP

WET LOCATIONS

W ET LOCATIONS

UNIT VOLTAGE

CONNECT AS

PRIMARY CONNECTIONS

TRANSFORMER TERMINALS

208,230 240 L1: RED +YEL L2: BLU + GRA

H1 + H3 H2 + H4

460 480 L1: RED

Splice BLU + YEL L2: GRA

H1 H2 + H3

H4

575 600 L1: RED L2: GRA

H1 H2

2.050HE501288

NOTICE/AVIS Convenience Outlet Utilization

Maximum Intermittent Use 15 - Amps Maximum Continuous Use 8 - Amps

Observe a 50% limit on the circuit Loading above 8 - Amps

Utilisation de la prise utilitaire Usage intermittent maximum 15 - Amps

Usage continu maximum 8 - Amps Observez une limite de 50% sur le circuit

Chargement au-dessus de 8 - Amps

36

HACR The amp rating of the HACR factory-installed option is based on the size, voltage, indoor motor and other electrical options of the unit as shipped from the factory. If field-installed accessories are added or changed in the field (i.e., power exhaust), the HACR may no longer be of the proper amp rating and therefore will need to be removed from the unit. See unit nameplate and label on fac- tory-installed HACR for the amp rating of the HACR that was shipped with the unit from the factory. See unit nameplates for the proper fuse, HACR or maximum over-current protection device required on the unit with field-installed accessories. See Fig. 53.

Fig. 53 HACR Caution Label

FACTORY OPTION THRU-BASE CONNECTIONS All units are equipped with the ability to bring utilities through the base. Gas is brought up through an embossed area located in the gas section behind the gas entrance post. Access is gained through the gas access panel. A knock out must be removed to accomplish this. The electrical entrance is located in the control box area and can be accessed through the control box access panel. An embossed area is provided with 3 knock outs. High voltage is brought through the multi knock out by removing the appropriate size for the size of the fitting required. A 7/8 in. knock out is provided for low voltage. An additional 7/8 in. knock out is provided for a 115 volt line which is used when the unit is equipped with the non- unit powered convenience outlet option. All required fittings are field supplied. Install fittings when access to both top and bottom of the base pan is available. See electrical and gas connections for routing and connection information. UNITS WITHOUT THRU-BASE CONNECTIONS 1. Install liquid tight conduit between disconnect and control

box. 2. Pull correctly rated high voltage wires through the conduit. 3. Install power lines to terminal connections as shown in

Fig. 48.

FIELD CONTROL WIRING The 48HC unit requires an external temperature control device. This device can be a thermostat (field-supplied) or a PremierLink controller (available as factory-installed option or as field-installed accessory, for use on a Carrier Comfort Network or as a stand alone control) or the RTU Open controller for Building Manage- ment Systems using non-CCN protocols (RTU Open controller is available as a factory-installed option only).

THERMOSTAT Install a Carrier-approved accessory 2-stage thermostat according to installation instructions included with the accessory. Locate the thermostat accessory on a solid wall in the conditioned space to sense average temperature in accordance with the thermostat in- stallation instructions. If the thermostat contains a logic circuit requiring 24 v power, use a thermostat cable or equivalent single leads of different colors with minimum of 7 leads. If the thermostat does not require a 24 v source (no C connection required), use a thermostat cable or equivalent with minimum of 6 leads. Check the thermostat instal- lation instructions for additional features which might require ad- ditional conductors in the cable. For wire runs up to 50 ft (15 m), use no. 18 AWG (American Wire Gauge) insulated wire (35C minimum). For 50 to 75 ft (15 to 23 m), use no. 16 AWG insulated wire (35C minimum). For over 75 ft (23 m), use no. 14 AWG insulated wire (35C minimum). All wire sizes larger than no. 18 AWG cannot be directly connect- ed to the thermostat and will require a junction box and splice at the thermostat. UNIT WITHOUT THRU-BASE CONNECTION KIT Correctly rated low voltage wire can be routed through the rubber grommet located on the corner post adjacent to the control box ac- cess panel. Route wire through the grommet and then route the wire behind the corner post utilizing the factory provided wire ties secured to the control box. This will ensure separation of the field low voltage wire and the high voltage circuit. Route the low volt- age wire to the central terminal board. See Fig. 54.

Fig. 54 Typical Low-Voltage Control Connections

CAUTION

UNIT DAMAGE HAZARD Failure to follow this caution may cause a short circuit. Carefully check the connection of control conductor for indoor fan control at terminal G. Connecting the indoor fan lead to ter- minal C will cause a short circuit condition, which can cause component damage inside the unit or at the thermostat.

C

W2

G

W1

R

Y1

TYPICAL THERMOSTAT

CORRECTIONS

O/B/Y2 (SEE NOTE)

NOTE: Typical multi-function marking. Follow manufacturers configuration instructions to select Y2.

Field Wiring

CENTRAL TERMINAL

BOARD

W1

Y2

Y1

R

W2

G

C

X

W1

Y2

Y1

R

W2

G

C

X

TSTAT

SEE CAUTION

37

NOTE: If utilizing the thru-the-base connections, route the low voltage wire through the wire ties to the central terminal board.

Fig. 55 Field Control Wiring Raceway

HEAT ANTICIPATOR SETTINGS Set heat anticipator settings at 0.14 amp for the first stage and 0.14 amp for second-stage heating. TRANSFORMER CONNECTION FOR 208 V POWER SUP- PLY All units except 208/230 v units are factory wired for the voltage shown on the nameplate. If the 208/230 v unit is to be connected to a 208 v power supply, the control transformer must be rewired by moving the black wire with the 1/4 in. female spade connector from the 230 v connection and moving it to the 208 v 1/4 in. male terminal on the primary side of the transformer. Refer to unit label diagram for additional information.

Humidi-MiZer System Control Connections HUMIDI-MIZER SPACE RH CONTROLLER NOTE: The Humidi-MiZer system is a factory-installed option. The Humidi-MiZer dehumidification system requires a field-sup- plied and installed space relative humidity control device. This de- vice may be a separate humidistat control (contact closes on rise in space RH above control setpoint, see Fig. 56) or a combination thermostat-humidistat control device such as Carriers Edge Pro Thermidistat with isolated contact set for dehumidification control (see Fig. 57). The humidistat is normally used in applications where a temperature control is already provided (units with PremierLink control).

To connect the Carrier humidistat (HL38MG029): 1. Route the humidistat 2-conductor cable (field-supplied)

through hole provided in the unit corner post. 2. Feed wires through the raceway built into the corner post (see

Fig. 55) to the 24 v barrier located on the left side of the con- trol box. The raceway provides the UL-required clearance between high-voltage and low-voltage wiring.

3. Use wire nuts to connect humidistat cable to 2 PINK leads in the low-voltage wiring as shown in Fig. 58).

To connect the Thermidistat device (33CS2PPRH-01): 1. Route the Thermidistat multi-conductor thermostat cable

(field-supplied) through hole provided in the unit corner post. 2. Feed wires through the raceway built into the corner post (see

Fig. 55) to the 24 v barrier located on the left side of the con- trol box. The raceway provides the UL-required clearance between high-voltage and low-voltage wiring.

3. The Thermidistat has dry contacts at terminals D1 and D2 for dehumidification operation (see Fig. 59). The dry contacts must be wired between CTB terminal R and the PINK lead to the LTLO switch with field-supplied wire nuts. Refer to the installation instructions included with the Carrier Edge Pro Thermidistat device for more information.

Fig. 56 Accessory Field-Installed Humidistat

Fig. 57 Edge Pro Thermidistat

RUBBER GROMMET

CORNER POST

WIRE TIES

THRU THE BASE CONNECTION

% RELATIVE HUMIDITY

38

Fig. 58 Typical Humidi-MiZer Adaptive Dehumidification System Humidistat Wiring

Fig. 59 Typical Rooftop Unit with Humidi-MiZer Adaptive Dehumidification System with Edge Pro Thermidistat Device

Rc Rh W1

G Y2 C

O/W2/B Y1

OAT RRS

SRTN HUM

D1 D2 V+ Vg

X*

C

G

W2

W1

Y2

Y1

R

Edge Programable Thermostat Unit CTB

THERMOSTAT

*Connection not required.

Humidi-MiZer FIOP

39

EconoMi$er X (Factory Option) The EconoMi$er X system is an expandable economizer control system, which includes a W7220 economizer module (controller) with an LCD and keypad (see Fig. 60). The W7220 can be config- ured with optional sensors.

Fig. 60 W7220 Economizer Module

The W7220 economizer module can be used as a stand-alone economizer module wired directly to a commercial set-back space thermostat and sensors to provide outside air dry-bulb economizer control. The W7220 economizer module can be connected to optional sen- sors for single or differential enthalpy control. The W7220 econo- mizer module provides power and communications for the sensors. The W7220 economizer module automatically detects sensors by polling to determine which sensors are present. If a sensor loses communications after it has been detected, the W7220 economizer controller indicates a device fail error on its LCD. SYSTEM COMPONENTS The EconoMi$er X system includes an economizer module, 20k mixed air sensor, damper actuator, and either a 20k outdoor air temperature sensor or S-Bus enthalpy sensors. Economizer Module The module is the core of the EconoMi$er X system. The module is mounted in the units control box, and includes the user inter- face for the system. The W7220 economizer module provides the basic inputs and outputs to provide simple economizer control. When used with the optional sensors, the economizer module pro- vides more advanced economizer functionality. S-Bus Enthalpy Control Sensors The sensor is a combination temperature and humidity sensor which is powered by and communicates on the S-Bus. Up to 3 sensors may be configured with the W7220 economizer module. CO2 Sensor (optional) The CO2 sensor can be added for Demand Controlled Ventilation (DCV). SPECIFICATIONS W7220 Economizer Module The module is designed for use with 2 to 10 vdc or bus communi- cating actuator. The module includes terminals for CO2 sensor, Mixed Air sensor, and an Outdoor Dry Bulb sensor. Enthalpy and other options are available with bus sensors. User Interface Provides status for normal operation, setup parameters, checkout tests, and alarm and error conditions with a 2-line 16 character LCD display and 4 button keypad.

Electrical Rated Voltage 20 to 30 vac RMS, 50/60 Hz Transformer 100 va maximum system input Nominal Power Consumption (at 24 vac, 60 Hz)

11.5 VA without sensors or actuators Relay Digital Output Rating at 30 vac (maximum power

from Class 2 input only) 1.5A run: 3.5A inrush at 0.45PF (200,000 cycles) or 7.5A inrush at 0.45PF (100,000 cycles)

External Sensors Power Output 21 vdc 5% at 48mA

INPUTS Sensors NOTE: A Mixed Air (MA) analog sensor is required on all W7220 units; either an Outdoor Air (OA) sensor for dry bulb change over or an OA bus sensor for outdoor enthalpy change over is required in addition to the MA sensor. An additional Re- turn Air (RA) bus sensor can be added to the system for differen- tial enthalpy or dry bulb changeover. For differential dry bulb changeover, a 20k ohm sensor is required in the OA and a bus sen- sor in the RA. DIP switch on RA bus sensor must be set in the RA position. Dry Bulb Temperature (optional) and Mixed Air (required), 20k NTC 2-wire (18 to 22 AWG); Temperature range 40F to 150F (40C to 66C) Temperature accuracy: 0F/+2F Temperature and Humidity, C7400S1000 (optional) S-Bus; 2-wire (18 to 22 AWG) Temperature: range 40F to 150F (40C to 65C) Temperature accuracy: 0F/+2F (18C/17C) Humidity: range 0 to 100% RH with 5% accuracy. NOTE: Up to 3 S-Bus sensors may be connected to the W7220 economizer module for outdoor air (OA), return air (RA) and dis- charge (supply) air (DA). 4 Binary Inputs 1-wire 24 vac + common GND (see page 40 for wiring details). 24 vac power supply 20 to 30 vac 50/60Hz; 100 VA Class 2 transformer. OUTPUTS Actuator Signal 2 to 10 vdc; minimum actuator impedance is 2k ohm; bus 2-wire output for bus communicating actuators. Exhaust fan, Y1, Y2 and AUX1 O All Relay Outputs (at 30 vac): Running: 1.5A maximum Inrush: 7.5A maximum ENVIRONMENTAL Operating Temperature 40F to 150F (40C to 65C). Exception of display operation down to 4F (20C) with full recovery at 4F (20C) from exposure to 40F (40C). Storage Temperature 40F to 150F (40C to 65C) Shipping Temperature 40F to 150F (40C to 65C)

IMPORTANT: All inputs and outputs must be Class 2 wiring.

40

Relative Humidity 5% to 95% RH non-condensing ECONOMIZER MODULE WIRING DETAILS Use Fig. 61 and Tables 5 and 6 to locate the wiring terminals for the Economizer module. NOTE: The 4 terminal blocks are removable. Slide out each ter- minal block, wire it, and then slide it back into place.

Fig. 61 W7220 Wiring Terminals

*Sylk is a trademark of Honeywell International Inc.

S-Bus Sensor Wiring The labels on the sensors and controller are color coded for ease of installation. Orange labeled sensors can only be wired to orange terminals on the controller. Brown labeled sensors can only be wired to S-bus (brown) terminals. Use Fig. 62 and Table 7 to lo- cate the wiring terminals for each S-Bus and enthalpy control sensor.

Fig. 62 S-Bus Sensor DIP Switches

Table 5 Economizer Module (Left Hand Terminal Blocks)

LABEL TYPE DESCRIPTION Top Left Terminal Block

MAT MAT

20k NTC and COM

Mixed Air Temperature Sensor (Polarity Insensitive Connection)

OAT OAT

20k NTC and COM

Outdoor Air Temperature Sensor (Polarity Insensitive Connection)

S-BUS S-BUS

S-BUS (Sylk* Bus)

Enthalpy Control Sensor (Polarity Insensitive Connection)

Bottom Left Terminal Block

IAQ 2-10 2-10 vdc Air Quality Sensor Input (e.g. CO2 sensor)

IAQ COM COM Air Quality Sensor Common IAQ 24V 24 vac Air Quality Sensor 24 vac Source ACT 2-10 2-10 vdc Damper Actuator Output (2-10 vdc) ACT COM COM Damper Actuator Output Common ACT 24v 24 vac Damper Actuator 24 vac Source

NA

AUX2-

OCC

E-GND

EXH1

AUX1-O

Y2-

Y1-

Y2-O

Y1-O

C

R

50048848-002 Rev. A

NA

A2

OCC

EX

A1

Y2I

Y2O

Y1I

Y1O

C

R

MAT

MAT

OAT

OAT

S-BUS

S-BUS

IAQ 2-10

IAQCOM

IAQ 24V

ACT 2-10

ACT COM

ACT 24V

MA MA

OA OA

SB SB

SB SB

SB SB

V C R

V C R

NA

50040839-001 Rev. G

HJW10 www.energy.ca.gov

Certified FDD Product California Title 24, Part 6

Table 6 Economizer Module (Right Hand Terminal Blocks)

LABEL TYPE DESCRIPTION Top Right Terminal Blocks

AUX2 I 24 vac IN The first terminal is not used.

OCC 24 vac IN

Shut Down (SD) or HEAT (W) Conventional only and Heat Pump Changeover (O-B) in Heat Pump mode.

E-GND E-GND Occupied/Unoccupied Input EXH1 24 vac OUT Exhaust Fan 1 Output

AUX1 O 24 vac OUT

Programmable: Exhaust fan 2 output or ERV or System alarm output

Bottom Right Terminal Blocks

Y2-I 24 vac IN Y2 in - Cooling Stage 2 Input from space thermostat

Y2-O 24 vac OUT Y2 out - Cooling Stage 2 Output to stage 2 mechanical cooling

Y1-I 24 vac IN Y1 in - Cooling Stage 2 Input from space thermostat

Y1-O 24 vac OUT Y1 out - Cooling Stage 2 Output to stage 2 mechanical cooling

C COM 24 vac Common R 24 vac 24 vac Power (hot)

DIP SWITCH LABEL

DIP SWITCHES (3)

S-BUS 2 PIN SIDE CONNECTOR

S-BUS TERMINALS (1 AND 2)

41

Use Fig. 62 and Table 8 to set the DIP switches for the desired use of the sensor.

NOTE: When an S-Bus sensor is connected to an existing net- work, it will take 60 minutes for the network to recognize and auto-configure itself to use the new sensor. During the 60-minute setup period, no alarms for sensor failures (except SAT) will be issued and no economizing function will be available. CO2 Sensor Wiring When using a CO2 sensor, the black and brown common wires are internally connected and only one is connected to IAQ COM on the W7220. Use the power from the W7220 to power the CO2 sen- sor OR make sure the ground for the power supplies are common. See Fig. 63 for CO2 sensor wiring.

Fig. 63 CO2 Sensor Wiring

INTERFACE OVERVIEW This section describes how to use the EconoMi$er user interface for: Keypad and menu navigation Settings and parameter changes Menu structure and selection

User Interface The user interface consists of a 2-line LCD display and a 4-button keypad on the front of the economizer controller. Keypad Use the 4 navigation buttons (see Fig. 64) to scroll through the menus and menu items, select menu items, and to change parame- ter and configuration settings. To use the keypad when working with menus: Press the (Up arrow) button to move to the previous

menu. Press the (Down arrow) button to move to the next

menu. Press the (Enter) button to display the first item in the

currently displayed menu.

Press the (Menu Up/Exit) button to exit a menus item and return to the list of menus.

Fig. 64 W7220 Controller Navigation Buttons

Table 7 HH57AC081 Sensor Wiring Terminations

TERMINAL TYPE DESCRIPTIONNUMBER LABEL

1 S-BUS S-BUS S-BUS

Communications (Enthalpy Control

Sensor Bus)

2 S-BUS S-BUS S-BUS

Communications (Enthalpy Control

Sensor Bus)

Table 8 HH57AC081 Sensor DIP Switch

USE DIP SWITCH POSITIONS FOR SWITCHES 1, 2, AND 3 1 2 3

DA OFF ON OFF RA ON OFF OFF OA OFF OFF OFF

CO2 SENSOR

24V

ANALOG OUT

L1 (HOT) L2

RED

BLACK

YELLOW

BROWN

ORANGE

GREEN

+

POWER SUPPLY. PROVIDE DISCONNECT MEANS AND OVERLOAD PROTECTION AS REQUIRED.

1

1

42

To use the keypad when working with Setpoints, System and Ad- vanced Settings, Checkout tests and Alarms: 1. Navigate to the desired menu. 2. Press the (Enter) button to display the first item in the

currently displayed menu. 3. Use the and buttons to scroll to the desired

parameter. 4. Press the (Enter) button to display the value of the

currently displayed item. 5. Press the button to increase (change) the displayed

parameter value. 6. Press the button to decrease (change) the displayed

parameter value. NOTE: When values are displayed, pressing and holding the or button causes the display to automatically increment or decrement. 1. Press the (Enter) button to accept the displayed value

and store it in nonvolatile RAM. CHANGE STORED displays.

2. Press the (Enter) button to return to the current menu parameter.

3. Press the (Menu Up/Exit) button to return to the previ- ous menu.

Menu Structure Table 9 illustrates the complete hierarchy of menus and parame- ters for the EconoMi$er X system.

The Menus in display order are: STATUS SETPOINTS SYSTEM SETUP ADVANCED SETUP CHECKOUT ALARMS

NOTE: Some parameters in the menus use the letters MA or MAT, indicating a mixed air temperature sensor location before the cooling coil. This unit application has the control sensor locat- ed after the cooling coil, in the fan section, where it is designated as (Cooling) Supply Air Temperature or SAT sensor. SETUP AND CONFIGURATION Before being placed into service, the W7220 Economizer module must be set up and configured for the installed system.

The setup process uses a hierarchical menu structure that is easy to use. Press the and arrow buttons to move forward and back- ward through the menus and press the button to select and confirm setup item changes. Time-Out and Screensaver When no buttons have been pressed for 10 minutes, the LCD dis- plays a screen saver, which cycles through the Status items. Each Status items displays in turn and cycles to the next item after 5 seconds.

IMPORTANT: During setup, the economizer module is live at all times.

43

Table 9 W7220 Menu Structure*

MENU PARAMETER PARAMETER

DEFAULT VALUE

PARAMETER RANGE AND INCREMENT

EXPANDED PARAMETER NAME NOTES

STATUS

ECON AVAIL NO YES/NO FIRST STAGE COOLING DEMAND (Y1IN) YES = economizing available; the system can use outside air for free cooling when required

ECONOMIZING NO YES/NO FIRST STAGE COOLING RELAY OUTPUT YES = outside air being used for first stage cooling

OCCUPIED NO YES/NO

OCCUPIED YES = OCC signal received from space thermostat or unitary controller YES = 24 vac on terminal OCC NO = 0 vac on terminal OCC

HEAT PUMP N/A** COOL

HEAT

HEAT PUMP MODE Displays COOL or HEAT when system is set to heat pump (Non-conventional)

COOL Y1IN OFF ON/OFF

FIRST STAGE COOLING DEMAND (Y1-IN) Y1I signal from space thermostat or unitary controller for cooling stage 1. ON = 24 vac on terminal Y1I OFF = 0 vac on terminal Y1I

COOL Y1OUT OFF ON/OFF FIRST STAGE COOLING RELAY OUTPUT Cool stage 1 Relay Output to stage 1 mechanical cooling (Y1OUT terminal)

COOL Y2IN OFF ON/OFF

SECOND STAGE COOLING DEMAND (Y2IN) Y2I signal from space thermostat or unitary controller for second stage cooling. ON = 24 vac on terminal Y2I OFF = 0 vac on terminal Y2I

COOL Y2OUT OFF ON/OFF SECOND STAGE COOLING RELAY OUTPUT Cool Stage 2 Relay Output to mechanical cooling (Y2OUT terminal)

MA TEMP _ _ . _ F (or _ _ . _ C)

40F to 150F (40C to 66C)

SUPPLY AIR TEMPERATURE, Cooling Mode Displays value of measured mixed air from MAT sensor. Displays _ _ . _ F if not connected, short or out of range.

DA TEMP _ _ . _ F (or _ _ . _ C)

40F to 150F (40C to 66C)

DISCHARGE AIR TEMPERATURE, after Heating section Displays when Discharge Air Sylk Bus sensor is connected and displays measured discharge temperature. Displays _ _ . _F if sensor sends invalid value, if not connected, short or out of range.

OA TEMP _ _ . _ F (or _ _ . _ C)

40F to 140F (40C to 60C)

OUTSIDE AIR TEMP Displays measured value of outdoor air temperature. Displays _ _ . _F if sensor sends invalid value, short or out of range.

OA HUM _ _ % 0 to 100% OUTSIDE AIR RELATIVE HUMIDITY Displays measured value of outdoor humidity from OA Sylk Bus sensor. Displays _ _% if not connected short, or out of range.

RA TEMP _ _ . _ F (or _ _ . _ C)

0F to 140F (18C to 60C)

RETURN AIR TEMPERATURE Displays measured value of return air temperature from RAT Sylk Bus sensor. Displays _ _ . _ F if sensor sends invalid value, if not connected, short or out of range

RA HUM _ _ % 0 to 100%

RETURN AIR RELATIVE HUMIDITY Displays measured value of return air humidity from RA Sylk Bus sensor. Displays _ _% if sensor sends invalid value, if not connected, short or out of range

IN CO2 _ _ _ ppm 0 to 2000 ppm SPACE/RETURN AIR CO2 Displays value of measured CO2 from CO2 sensor. Invalid if not connected, short or out of range. May be adjusted in Advanced menu by Zero offset and Span.

DCV STATUS N/A ON/OFF DEMAND CONTROLLED VENTILATION STATUS Displays ON if above set point and OFF if below set point, and ONLY if a CO2 sensor is connected.

DAMPER OUT 2.0v 2.0 to 10.0v Displays voltage output to the damper actuator.*** ACT POS N/A 0 to 100% Displays actual position of actuator

ACT COUNT N/A 1 to 65,535 Displays number of times actuator has cycled. 1 cycle equals 180 degrees of actuator movement in any direction.

ACTUATOR N/A OK/Alarm (on Alarm menu) Displays ERROR if voltage or torque is below actuator range.

EXH1 OUT OFF ON/OFF

EXHAUST STAGE 1 RELAY OUTPUT Displays ON when damper position reaches programmed percentage set point. Output of EXH1 terminal: ON = relay closed OFF = relay open

44

STATUS (cont)

EXH2 OUT OFF ON/OFF

EXHAUST STAGE 2 RELAY OUTPUT Output of AUX1 O terminal Displays ON when damper position reaches programmed percentage set point. ON = 24 vac output OFF = No output Displays only if AUX1 O = EXH2

ERV OFF ON/OFF ENERGY RECOVERY VENTILATOR Output of AUX1 O terminal; displays only if AUX1 O = ERV ON = 24 vac output OFF = No Output

MECH COOL ON or

HEAT STAGES ON 0 0, 1, or 2

Displays stage of mechanical cooling that is active.

Displays the stage of heat pump heating that is active.

FAN SPEED N/A LOW or HIGH SUPPLY FAN SPEED Displays speed setting of fan on a 2-speed fan unit.

W (HEAT IN) N/A ON/OFF HEAT DEMAND STATUS Displays status of heat demand on a 2-speed fan unit.

SETPOINTS

MAT SET 53F (12C) 38F to 70F

(3C to 21C); increment by 1

degree

SUPPLY AIR SETPOINT The economizer will modulate the OA damper to maintain the mixed air temperature at the set point

LOW T LOCK 32F (0C) 45F to 80F

(43C to 27C); increment by 1

degree

COMPRESSOR LOW TEMPERATURE LOCKOUT Set point determines outdoor temperature when the mechanical cooling cannot be turned on. Commonly referred to as the Compressor lockout. At or below the set point, the Y1-O and Y2- O will not be energized on the controller.

DRYBLB SET 63F (17C) 48F to 80F

(9C to 27C); increment by

1 degree

OA DRY BULB TEMPERATURE CHANGEOVER SETPOINT Dry bulb set point will only appear if using dry bulb changeover. Set point determines where the economizer will assume outdoor air temperature is good for free cooling; e.g.; at 63F unit will economize at 62F and below and not economize at 64F and above. There is a 2F deadband.

ENTH CURVE ES3 ES1,ES2,ES3,ES4, or ES5

ENTHALPY CHANGEOVER CURVE ES curve will only appear if using enthalpy changeover. Enthalpy boundary curves for economizing using single enthalpy. See page 51 for description of enthalpy curves.

DCV SET 1100ppm 500 to 2000 ppm; increment by 100

DEMAND CONTROLLED VENTILATION Displays only if CO2 sensor is connected. Set point for Demand Controlled Ventilation of space. Above the set point, the OA dampers will modulate open to bring in additional OA to maintain a space ppm level below the set point.

MIN POS 2.8 V 2 to 10 vdc

VENTILATION MINIMUM POSITION Displays ONLY if a CO2 sensor is NOT connected. With 2-speed fan units, MIN POS L (low speed fan) and MIN POS H (high speed fan) settings are required. Default for MIN POS L is 3.2V and MIN POS H is 2.8V.

VENTMAX 2.8 V

2 to 10 vdc

DCV MAXIMUM DAMPER POSITION Displays only if a CO2 sensor is connected. Used for Vbz (ventilation max CFM) set point. VENTMAX is the same setting as MIN POS would be if unit did not have CO2 sensor.

100 to 9990 CFM; increment by 10

If OA, MA, RA, and CO2 sensors are connected and DCV CAL ENABLE is set to AUTO mode, the OA dampers are controlled by CFM and displays from 100 to 9990 CFM.

2 to 10 vdc With 2-speed fan units, VENTMAX L (low speed fan) and VENTMAX H (high speed fan) settings are required. Default for VENTMAX L is 3.2V and VENTMAX H is 2.8V

VENTMIN 2.25 V

2 to 10 vdc or 100 to 9990 CFM

increment by 10

DCV MINIMUM DAMPER POSITION Displays only if a CO2 sensor is connected. Used for Va (ventilation min CFM) set point. This is the ventilation for less than maximum occupancy of the space.

100 to 9990 CFM; increment by 10

If OA, MA, RA, and CO2 sensors are connected and DCV CAL ENABLE is set to AUTO mode, the OA dampers are controlled by CFM and displays from 100 to 9990 CFM.

2 to 10 vdc With 2-speed fan units VENTMIN L (low speed fan) and VENTMIN H (high speed fan) settings are required. Default for VENTMIN L is 2.5V and VENTMIN H is 2.25V

ERV OAT SP 32F (0C) 0F to 50F

(18C to 10C); increment by

1 degree

ENERGY RECOVERY VENTILATOR UNIT OUTDOOR AIR TEMPERATURE SETPOINT Only when AUX1 O = ERV

Table 9 W7220 Menu Structure* (cont)

MENU PARAMETER PARAMETER

DEFAULT VALUE

PARAMETER RANGE AND INCREMENT

EXPANDED PARAMETER NAME NOTES

45

SETPOINTS (cont)

EXH1 SET 50% 0 to 100%; increment by 1

EXHAUST FAN STAGE 1 SETPOINT Set point for OA damper position when exhaust fan 1 is powered by the economizer. With 2-speed fan units, Exh1 L (low speed fan) and Exh1 H (high speed fan) settings are required. Default for Exh1 L is 65% and Exh1 H is 50%

EXH2 SET 75% 0 to 100%; increment by 1

EXHAUST FAN STAGE 2 SETPOINT Set point for OA damper position when exhaust fan 2 is powered by the economizer. Only used when AUX1 O is set to EHX2. With 2-speed fan units, Exh2 L (low speed fan) and Exh2 H (high speed fan) settings are required. Default for Exh2 L is 80% and Exh2 H is 75%

SYSTEM SETUP

INSTALL 01/01/10 N/A Display order = MM/DD/YY Setting order = DD, MM, then YY.

UNITS DEG F F or C Sets economizer controller in degrees Fahrenheit or Celsius

EQUIPMENT CONV CONV

or HP

CONV = conventional; HP O/B = Enable Heat Pump mode. Use AUX2 I for Heat Pump input from thermostat or controller.

AUX2 IN W Shutdown (SD)

Heat (W1) HP(O) HP(B)

In CONV mode: SD = Enables configuration of shutdown (default); W = Informs controller that system is in heating mode. NOTE: If using 2-speed fan mode, you must program CONV mode for W. Shutdown is not available in 2-speed fan mode. In HP O/B mode: HP(O) = energize heat pump on Cool (default); HP(B) = energize heat pump on heat.

FAN SPEED 2 speed 1 speed/2 speed

Sets the economizer controller for operation of 1 speed or 2 speed supply fan. The controller does not control the fan, but positions the OA and RA dampers to heating or cooling mode. NOTE: 2-speed fan option also needs Heat (W1) programmed in AUX 2 In.

FAN CFM 5000 CFM 100 to 15000 CFM; increment by 100

UNIT DESIGN AIRFLOW (CFM) Enter only if using DCVCAL ENA = AUTO This is the capacity of the RTU. The value is found on the nameplate label for the specific unit.

AUX1 OUT NONE NONE ERV EXH2 SYS

Select OUTPUT for AUX1 O relay NONE = not configured (output is not used) ERV = Energy Recovery Ventilator

EXH2 = second damper position 24 vac out for second exhaust fan SYS = use output as an alarm signal

OCC INPUT INPUT or ALWAYS

OCCUPIED MODE BY EXTERNAL SIGNAL When using a setback thermostat with occupancy out (24 vac), the 24 vac is input INPUT to the OCC terminal. If no occupancy output from the thermostat, then change program to ALWAYS OR add a jumper from terminal R to OCC terminal.

FACTORY DEFAULT NO NO or YES Resets all set points to factory defaults when set to YES. LCD will briefly flash YES and change to NO but all parameters will change to the factory default values.

ADVANCED SETUP

MA LO SET 45F (7C) 35F to 65F

(2C to 18C); Increment by

1 degree

SUPPLY AIR TEMPERATURE LOW LIMIT Temperature to activate Freeze Protection (close damper or modulate to MIN POS if temp falls below set value).

FREEZE POS CLO CLO or MIN FREEZE PROTECTION DAMPER POSITION Damper position when freeze protection is active (closed or MIN POS).

CO2 ZERO 0ppm 0 to 500 ppm; Increment by 10 CO2 ppm level to match CO2 sensor start level.

CO2 SPAN 2000ppm 1000 to 3000 ppm; Increment by 50

CO2 ppm span to match CO2 sensor; e.g.: 500-1500 sensor output would be 500 CO2 zero and 1000 CO2 span.

STG3 DLY 2.0h 0 min, 5 min, 15 min, then 15 min intervals. Up to 4 hrs or OFF

COOLING STAGE 3 DELAY Delay after stage 2 cool has been active. Turns on second stage of cooling when economizer is first stage call and mechanical cooling is second stage call. Allows 3 stages of cooling, 1 economizer and 2 mechanical. OFF = no Stage 3 cooling

SD DMPR POS CLO CLO or OPN

Indicates shutdown signal from space thermostat or unitary controller. When controller receives 24 vac input on the SD terminal in conventional mode, the OA damper will open if programmed for OPN and OA damper will close if programmed for CLO. All other controls, e.g., fans, etc. will shut off.

DA LO ALM 45F (7C) NONE

35F to 65F (2C to 18C);

Increment by 5F

Used for alarm for when the DA air temperature is too low. Set lower range of alarm, below this temperature the alarm will show on the display.

Table 9 W7220 Menu Structure* (cont)

MENU PARAMETER PARAMETER

DEFAULT VALUE

PARAMETER RANGE AND INCREMENT

EXPANDED PARAMETER NAME NOTES

46

ADVANCED SETUP (cont)

DA HI ALM 80F (27C) NONE

70F to 180F (21C to 82C);

Increment by 5F

Used for alarm for when the DA air temperature is too high. Sets upper range of alarm; above this temperature, the alarm will show on the display.

DCVCAL ENA MAN MAN (manual) AUTO

Turns on the DCV automatic control of the dampers. Resets ventilation based on the RA, OA, and MA sensor conditions. Requires all (RA, OA, MA, CO2) sensors. This operation is not operable with a 2-speed fan unit.

MAT T CAL 0.0F 2.5F SUPPLY AIR TEMPERATURE CALIBRATION Allows for the operator to adjust for an out of calibration temperature sensor.

OAS T CAL 0.0F 2.5F OUTSIDE AIR TEMPERATURE CALIBRATION Allows for the operator to adjust for an out of calibration temperature sensor.

OA H CAL 0% RH 10% RH OUTSIDE AIR HUMIDITY CALIBRATION Allows for operator to adjust for an out of calibration humidity sensor.

RA T CAL 0.0F 2.5F RETURN AIR TEMPERATURE CALIBRATION Allows for the operator to adjust for an out of calibration temperature sensor.

RA H CAL 0% RH 10% RH RETURN AIR HUMIDITY CALIBRATION Allows for operator to adjust for an out of calibration humidity sensor.

DA T CAL 0.0F 2.5F DISCHARGE AIR TEMPERATURE CALIBRATION Allows for the operator to adjust for an out of calibration temperature sensor.

2SP FAN DELAY 5 Minutes 0 to 20 minutes in 1 minute increments

TIME DELAY ON SECOND STAGE ECONOMIZING When in economizing mode, this is the delay for the high speed fan to try to satisfy the call for second stage cooling before the first stage mechanical cooling is enabled.

CHECKOUT***

DAMPER MINIMUM POSITION N/A N/A The checkout for the damper minimum position is based on the

system. See Table 10.

DAMPER OPEN N/A N/A Position damper to the full open position. Exhaust fan contacts enable during the DAMPER OPEN test. Make sure to pause in the mode to allow exhaust contacts to energize due to the delay in the system.

DAMPER CLOSE N/A N/A Positions damper to the fully closed position CONNECT Y1O N/A N/A Closes the Y1-O relay (Y1-O) CONNECT Y2O N/A N/A Closes the Y2-O relay (Y2-O)

CONNECT AUX1O N/A N/A

Energizes the AUX output. If Aux setting is: NONE no action taken ERV 24 vac out. Turns on or signals an ERV that the conditions are not good for economizing but are for ERV operation.

SYS 24 vac out. Issues a system alarm CONNECT EXH1 N/A N/A Closes the power exhaust fan 1 relay (EXH1)

ALARMS

Alarms display only when they are active. The menu title ALARMS(#) includes the number of active alarms in parenthesis ( ). When using SYLK bus sensors, SYLK will appear on the screen, and when using 20k OA temperature sensors, SENS T will

appear on the screen

MA T SENS ERR N/A N/A SUPPLY AIR TEMPERATURE SENSOR ERROR Mixed air sensor has failed or become disconnected - check wiring, then replace sensor if the alarm continues.

CO2 SENS ERR N/A N/A CO2 SENSOR ERROR CO2 sensor has failed, gone out of range or become disconnected - check wiring then replace sensor if the alarm continues.

OA SYLK T ERR N/A N/A OUTSIDE AIR S-BUS SENSOR ERROR Outdoor air enthalpy sensor has failed or become disconnected - check wiring, then replace sensor if the alarm continues.OA SYLK H ERR N/A N/A

RA SYLK T ERR N/A N/A RETURN AIR S-BUS SENSOR ERROR Return air enthalpy sensor has failed or become disconnected - check wiring, then replace sensor if the alarm continues.RA SYLK H ERR N/A N/A

DA SYLK T ERR N/A N/A DISCHARGE AIR S-BUS SENSOR ERROR Discharge air sensor has failed or become disconnected - check wiring, then replace sensor if the alarm continues.

OA SENS T ERR N/A N/A OUTSIDE AIR TEMPERATURE SENSOR ERROR Outdoor air temperature sensor has failed or become disconnected - check wiring, then replace if the alarm continues.

ACT ERROR N/A N/A

ACTUATOR ERROR Actuator has failed or become disconnected - check for stall, over voltage, under voltage and actuator count. Replace actuator if damper is movable and supply voltage is between 21.6 V and 26.4 V. Check actuator count on STATUS menu.

Table 9 W7220 Menu Structure* (cont)

MENU PARAMETER PARAMETER

DEFAULT VALUE

PARAMETER RANGE AND INCREMENT

EXPANDED PARAMETER NAME NOTES

47

LEGEND

* Table 9 illustrates the complete hierarchy. Your menu parameters may be different depending on your configuration. For example, if you do not have a DCV (CO2) sensor, then none of the DCV parameters appear.

When values are displayed, pressing and holding the or button causes the display to automatically increment.

** N/A = Not Applicable.

ERV Operation: When in cooling mode AND the conditions are NOT OK for economizing - the ERV terminal will be energized. In the Heating mode, the ERV terminal will be energized when the OA is below the ERV OAT set point in the set point menu.

*** After 10 minutes without a command or mode change, the controller will change to normal operation.

NOTES: 1. STATUS > OCCUPIED The factory-standard Occupancy sig-

nal originates with a thermostat or other controller call for indoor fan operation at CTB terminal G. This signal passes through the Central Terminal Boards OCCUPANCY jumper to the ECONO connector and to the W7220s OCC input terminal. An external timeclock or relay is required to implement an Occupancy schedule on the economizer damper position.

2. STATUS > MA TEMP, SETPOINTS > MAT SET The W7220 menu parameters and labels include designations MA, MAT and Mixed Air for the economizer cooling control sensor. On these rooftop units, the economizer control sensor is located downstream of the evaporator/indoor coil in the supply fan section where this sensor is designated as Supply Air Temperature (SAT) sensor.

3. SETPOINTS > DRYBLB SET This point is not displayed if a Return Air (differential) temperature sensor or an Outdoor Air enthalpy sensor is connected.

4. SYSTEM SETUP parameters must be configured as noted for 2- Speed unit operation: EQUIPMENT = CONV AUX2 I = W FAN SPEED = 2SPEED

For damper minimum position settings and checkout menu read- ings, see Table 10. For dry bulb operation with a 1-speed fan, with or without DCV, see Tables 11 and 12. For enthalpy operation with a 1-speed fan, with or without DCV, see Tables 13 and 14. For dry bulb operation with a 2 speed indoor fan, with or without DCV, see Tables 15 and 16. For enthalpy operation with a 2 speed indoor fan, with or without DCV, see Tables 17 and 18.

ALARMS (CONT)

FREEZE ALARM N/A N/A Check if outdoor temperature is below the LOW Temp Lockout on set point menu. Check if Mixed air temperature on STATUS menu is below the Lo Set point on Advanced menu. When conditions are back in normal range, the alarm will go away.

SHUTDOWN ACTIVE N/A N/A AUX2 IN is programmed for SHUTDOWN and 24 V has been applied to AUX2 IN terminal.

DMP CAL RUNNING N/A N/A

DAMPER CALIBRATION ROUTINE RUNNING If DCV Auto enable has been programmed, this alarm will display when the W7220 is completing a calibration on the dampers. Wait until the calibration is completed and the alarm will go away. Must have OA, MA and RA sensors for DCV calibration; set up is in the Advanced setup menu.

DA SENS ALM N/A N/A DISCHARGE AIR TEMPERATURE SENSOR ALARM Discharge air temperature is out of the range set in the ADVANCED SETUP Menu. Check the temperature of the discharge air.

SYS ALARM N/A N/A When AUX1-O is set to SYS and there is any alarm (e.g., failed sensors, etc.), the AUX1-O terminal has 24 vac out.

ACT UNDER V N/A N/A ACTUATOR VOLTAGE LOW Voltage received by actuator is above expected range.

ACT OVER V N/A N/A ACTUATOR VOLTAGE HIGH Voltage received by actuator is below expected range.

ACT STALLED N/A N/A ACTUATOR STALLED Actuator stopped before achieving commanded position.

Table 9 W7220 Menu Structure* (cont)

MENU PARAMETER PARAMETER

DEFAULT VALUE

PARAMETER RANGE AND INCREMENT

EXPANDED PARAMETER NAME NOTES

CLO Compressor Lockout ERV Energy Recovery Ventilator LCD Liquid Crystal Display MA Mixed Air MAT Mixed Air Temperature N/A Not Applicable OA Outdoor Air OAT Outdoor Air Temperature OCC Occupied RA Return Air RAT Return Air Temperature RTU Rooftop Unit SYS System

48

* With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2O after the delay if the call for YI and Y2I have not been satisfied.

* With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2O after the delay if the call for YI and Y2I have not been satisfied.

Table 10 Damper Minimum Position Settings and Readings on Checkout Menu

DEMAND CONTROLLED VENTILATION (CO2 SENSOR)

FAN SPEED SETPOINTS CHECKOUT

NO 1

MIN POS VMAXHS N/A N/A

2 MIN POS H VMAXHS MIN POS L VMAXLS

YES

1 VENT MIN VMAXHS VENT MAX VMAXHS

2

VENT MIN H VMAXHS VENT MAX H VMAXLS VENT MIN L N/A VENT MAX L N/A

Table 11 Dry Bulb Operation without DCV (CO2 Sensor) 1 Speed Fan

DEMAND CONTROLLED

VENTILATION (DCV)

OUTSIDE AIR GOOD TO

ECONOMIZE Y1-I Y2-I FAN SPEED Y1-O Y2-O OCCUPIED UNOCCUPIED

NONE

No Off Off High 0 v/Off 0 v/Off MIN POS Closed On Off High 24 v/On 0 v/Off MIN POS Closed On On High 24 v/On 24 v/On MIN POS Closed

Yes

Off Off High 0 v/Off 0 v/Off MIN POS Closed

On Off High 0 v/Off 0 v/Off MIN POS to Full-Open

Closed to Full-Open

On On High 24 v/On 0 v/Off* MIN POS to Full-Open

Closed to Full-Open

Table 12 Dry Bulb Operation with DCV (CO2 Sensor) 1 Speed Fan

DEMAND CONTROLLED

VENTILATION (DCV)

OUTSIDE AIR GOOD TO

ECONOMIZE Y1-I Y2-I FAN SPEED Y1-O Y2-O OCCUPIED UNOCCUPIED

Below CO2 set

No Off Off High 0 v/Off 0 v/Off VENTMIN Closed On Off High 24 v/On 0 v/Off VENTMIN Closed On On High 24 v/On 24 v/On VENTMIN Closed

Yes

Off Off High 0 v/Off 0 v/Off VENTMIN Closed

On Off High 0 v/Off 0 v/Off VENTMIN to Full-Open

Closed to Full-Open

On On High 24 v/On 0 v/Off* VENTMIN to Full-Open

Closed to Full-Open

Above CO2 set

No

Off Off High 0 v/Off 0 v/Off VENTMIN to VENTMAX Closed

On Off High 24 v/On 0 v/Off VENTMIN to VENTMAX Closed

On On High 24 v/On 24 v/On VENTMIN to VENTMAX Closed

Yes

Off Off High 0 v/Off 0 v/Off VENTMIN to VENTMAX Closed

On Off High 0 v/Off 0 v/Off VENTMIN to Full-Open

Closed to Full-Open

On On High 24 v/On 0 v/Off* VENTMIN to Full-Open

Closed to Full-Open

49

* With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2O after the delay if the call for YI and Y2I have not been satisfied.

* With 2SP FAN DELAY (Advanced Setup Menu) when in the economizing mode there is a delay for the high speed fan to try to satisfy the call for sec- ond stage cooling by turning on the fan to high and opening the OA damper 100% before the first stage mechanical cooling is enabled.

With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2O after the delay if the call for YI and Y2I have not been satisfied.

* With 2SP FAN DELAY (Advanced Setup Menu) when in the economizing mode there is a delay for the high speed fan to try to satisfy the call for sec- ond stage cooling by turning on the fan to high and opening the OA damper 100% before the first stage mechanical cooling is enabled.

With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2O after the delay if the call for YI and Y2I have not been satisfied.

Table 13 Enthalpy Operation without DCV (CO2 Sensor) 1 Speed Fan

DEMAND CONTROLLED

VENTILATION (DCV)

OUTSIDE AIR GOOD TO

ECONOMIZE Y1-I Y2-I FAN SPEED Y1-O Y2-O OCCUPIED UNOCCUPIED

NONE

No Off Off High 0 v/Off 0 v/Off MIN POS Closed On Off High 24 v/On 0 v/Off MIN POS Closed On On High 24 v/On 24 v/On MIN POS Closed

Yes

Off Off High 0 v/Off 0 v/Off MIN POS Closed

On Off High 0 v/Off 0 v/Off MIN POS to Full-Open

Closed to Full-Open

On On High 24 v/On 0 v/Off* MIN POS to Full-Open

Closed to Full-Open

Table 14 Enthalpy Operation with DCV (CO2 Sensor) 1 Speed Fan

DEMAND CONTROLLED

VENTILATION (DCV)

OUTSIDE AIR GOOD TO

ECONOMIZE Y1-I Y2-I FAN SPEED Y1-O Y2-O OCCUPIED UNOCCUPIED

Below CO2 set

No Off Off High 0 v/Off 0 v/Off VENTMIN Closed On Off High 24 v/On 0 v/Off VENTMIN Closed On On High 24 v/On 24 v/On VENTMIN Closed

Yes

Off Off High 0 v/Off 0 v/Off VENTMIN Closed

On Off High 0 v/Off 0 v/Off VENTMIN to Full-Open

Closed to Full-Open

On On High 24 v/On 0 v/Off VENTMIN to Full-Open

Closed to Full-Open

Above CO2 set

No

Off Off High 0 v/Off 0 v/Off VENTMIN to VENTMAX Closed

On Off High 24 v/On 0 v/Off VENTMIN L to VENTMAX Closed

On On High 24 v/On 24 v/On VENTMIN H to VENTMAX Closed

Yes

Off Off High 0 v/Off 0 v/Off VENTMIN L to VENTMAX Closed

On Off High 0 v/Off 0 v/Off VENTMIN to Full-Open

Closed to Full-Open

On On High DELAY* 24 v/On 0 v/Off VENTMIN to

Full-Open Closed to Full-Open

Table 15 Dry Bulb Operation without DCV (CO2 Sensor) 2 Speed Fan

DEMAND CONTROLLED

VENTILATION (DCV)

OUTSIDE AIR GOOD TO

ECONOMIZE Y1-I Y2-I FAN SPEED Y1-O Y2-O OCCUPIED UNOCCUPIED

NONE

No Off Off Low 0 v/Off 0 v/Off MIN POS L Closed On Off Low 24 v/On 0 v/Off MIN POS L Closed On On High 24 v/On 24 v/On MIN POS H Closed

Yes

Off Off Low 0 v/Off 0 v/Off MIN POS L Closed

On Off Low 0 v/Off 0 v/Off MIN POS L to Full-Open

Closed to Full-Open

On On High DELAY* 24 v/On 0 v/Off MIN POS H

to Full-Open Closed to Full-Open

50

* With 2SP FAN DELAY (Advanced Setup Menu) when in the economizing mode there is a delay for the high speed fan to try to satisfy the call for sec- ond stage cooling by turning on the fan to high and opening the OA damper 100% before the first stage mechanical cooling is enabled.

With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2O after the delay if the call for Y1I and Y2I have not been satisfied.

* With 2SP FAN DELAY (Advanced Setup Menu) when in the economizing mode there is a delay for the high speed fan to try to satisfy the call for sec- ond stage cooling by turning on the fan to high and opening the OA damper 100% before the first stage mechanical cooling is enabled.

With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2O after the delay if the call for Y1I and Y2I have not been satisfied.

Table 16 Dry Bulb Operation with DCV (CO2 Sensor) 2 Speed Fan

DEMAND CONTROLLED

VENTILATION (DCV)

OUTSIDE AIR GOOD TO

ECONOMIZE Y1-I Y2-I FAN

SPEED Y1-O Y2-O OCCUPIED UNOCCUPIED

Below CO2 Set

No OFF OFF LOW 0v/Off 0v/Off VENTMIN Closed ON OFF LOW 24v/On 0v/Off VENTMIN Closed ON ON HIGH 24v/On 24v/On VENTMIN Closed

Yes

OFF OFF LOW 0v/Off 0v/Off VENTMIN Closed

ON OFF LOW 0v/Off 0v/Off VENTMIN to Full-Open Closed to Full-Open

ON ON HIGH 24v/On 0v/Off VENTMIN to Full-Open Closed to Full-Open

Above CO2 Set

No

OFF OFF LOW 0v/Off 0v/Off VENTMIN to VENTMAX Closed

ON OFF LOW 24v/On 0v/Off VENTMIN to VENTMAX Closed

ON ON HIGH 24v/On 24v/On VENTMIN to VENTMAX Closed

Yes

OFF OFF LOW 0v/Off 0v/Off VENTMIN to VENTMAX Closed

ON OFF LOW 0v/Off 0v/Off VENTMIN to Full-Open Closed to Full-Open

ON ON HIGH DELAY* 24v/On 0v/Off VENTMIN to

Full-Open Closed to Full-Open

Table 17 Enthalpy Operation without DCV (CO2 Sensor) 2 Speed Fan

DEMAND CONTROLLED

VENTILATION (DCV)

OUTSIDE AIR GOOD TO

ECONOMIZE Y1-I Y2-I FAN

SPEED Y1-O Y2-O OCCUPIED UNOCCUPIED

NO CO2 SENSOR

NO OFF OFF LOW 0v/Off 0v/Off MIN POS Closed ON OFF LOW 24v/On 0v/Off MIN POS Closed ON ON HIGH 24v/On 24v/On MIN POS Closed

YES

OFF OFF LOW 0v/Off 0v/Off MIN POS Closed ON OFF LOW 0v/Off 0v/Off MIN POS to Full Open Closed to Full-Open

ON ON HIGH DELAY* 24v/On 0v/Off MIN POS to Full Open Closed to Full-Open

51

* With 2SP FAN DELAY (Advanced Setup Menu) when in the economizing mode there is a delay for the high speed fan to try to satisfy the call for sec- ond stage cooling by turning on the fan to high and opening the OA damper 100% before the first stage mechanical cooling is enabled.

With stage 3 delay (STG3 DLY) in Advanced setup menu can turn on second stage of mechanical cooling Y2O after the delay if the call for Y1I and Y2I have not been satisfied.

ENTHALPY SETTINGS When the OA temperature, enthalpy and dew point are below the respective set points, the Outdoor Air can be used for economiz- ing. Figure 65 shows the new single enthalpy boundaries in the W7220. There are 5 boundaries (set points ES1 through ES5), which are defined by dry bulb temperature, enthalpy and dew point. Refer to Table 20 for ENTH CURVE set point values. The W7220 calculates the enthalpy and dew point using the OA temperature and humidity input from the OA enthalpy sensor. When the OA temperature, OA humidity and OA dew point are all below the selected boundary, the economizer sets the econo- mizing mode to YES, economizing is available. When all of the OA conditions are above the selected boundary, the conditions are not good to economize and the mode is set to NO. Figure 65 shows the 5 current boundaries. There is also a high lim- it boundary for differential enthalpy. The high limit boundary is ES1 when there are no stages of mechanical cooling energized and HL (high limit) when a compressor stage is energized. TWO-SPEED FAN OPERATION The W7220 controller has the capability to work with a system us- ing a 2-speed supply fan. The W7220 does not control the supply directly but uses the following input status to determine the speed of the supply fan and controls the OA damper to the required posi- tion, see Table 19.

The W (heating mode) is not controlled by the W7220 but it re- quires the status to know where to position the OA damper for minimum position for the fan speed. The 2 speed fan delay is available when the system is programmed for 2 speed fan (in the System Setup menu item). The 2 speed fan delay is defaulted to 5 minutes and can be changed in the Ad- vanced Setup menu item. When the unit has a call for Y1 In and in the free cooling mode and there is a call for Y2 In, the 2-speed fan delay starts and the OA damper will modulate 100% open, the supply fan should be set to high speed by the unit controller. After the delay one of 2 actions will happen: The Y2 In call will be satisfied with the damper 100%

open and fan on high speed and the call will turn off OR

If the call for additional cooling in the space has not been satisfied then the first stage of mechanical cooling will be enabled through Y1 Out or Y2 Out.

Table 18 Enthalpy Operation with DCV (CO2 Sensor) 2 Speed Fan

DEMAND CONTROLLED

VENTILATION (DCV)

OUTSIDE AIR GOOD TO

ECONOMIZE Y1-I Y2-I FAN

SPEED Y1-O Y2-O OCCUPIED UNOCCUPIED

Below CO2 Set

No OFF OFF LOW 0v/Off 0v/Off VENTMIN Closed ON OFF LOW 24v/On 0v/Off VENTMIN Closed ON ON HIGH 24v/On 24v/On VENTMIN Closed

Yes

OFF OFF LOW 0v/Off 0v/Off VENTMIN Closed

ON OFF LOW 0v/Off 0v/Off VENTMIN to Full-Open Closed to Full-Open

ON ON HIGH 24v/On 0v/Off VENTMIN to Full-Open Closed to Full-Open

Above CO2 Set

No

OFF OFF LOW 0v/Off 0v/Off VENTMIN to VENTMAX Closed

ON OFF LOW 24v/On 0v/Off VENTMIN to VENTMAX Closed

ON ON HIGH 24v/On 24v/On VENTMIN to VENTMAX Closed

Yes

OFF OFF LOW 0v/Off 0v/Off VENTMIN to VENTMAX Closed

ON OFF LOW 0v/Off 0v/Off VENTMIN to Full-Open Closed to Full-Open

ON ON HIGH DELAY* 24v/On 0v/Off* VENTMIN to

Full-Open Closed to Full-Open

Table 19 Fan Speed

STATE FAN SPEED OCC Low Y1 Low Y2 High W High

52

Fig. 65 Single Enthalpy Curve Boundaries

CHECKOUT Inspect all wiring connections at the economizer modules termi- nals, and verify compliance with the installation wiring diagrams. For checkout, review the Status of each configured parameter and perform the Checkout tests. NOTE: For information about menu navigation and use of the keypad, see Interface Overview on page 41. Power Up After the W7220 module is mounted and wired, apply power. Initial Menu Display On initial start up, Honeywell displays on the first line and econo- mizer W7220 on the second line. After a brief pause, the revision of the software appears on the first line and the second line will be blank. Power Loss (Outage or Brownout) All set points and advanced settings are restored after any power loss or interruption. NOTE: All settings are stored in non-volatile flash memory. Status Use the Status menu (see Table 9) to check the parameter values for the various devices and sensors configured. NOTE: For information about menu navigation and use of the keypad, see Interface Overview on page 41. Checkout Tests Use the Checkout menu (see page 46) to test the damper operation and any configured outputs. Only items that are configured are shown in the Checkout menu. NOTE: For information about menu navigation and use of the keypad, see Interface Overview on page 41. To perform a Checkout test:

1. Scroll to the desired test in the Checkout menu using the and buttons.

2. Press the (Enter) button to select the item. RUN? appears.

3. Press the (Enter) button to start the test. The unit pauses and then displays IN PROGRESS. When the test is complete, DONE appears.

4. When all desired parameters have been tested, press the (Menu Up) button to end the test.

The Checkout tests can all be performed at the time of installation or at any time during the operation of the system as a test that the system is operable.

TROUBLESHOOTING Alarms The economizer module provides alarm messages that display on the 2-line LCD. NOTE: Upon power up, the module waits 60 minutes before checking for alarms. This allows time for all the configured devic- es (e.g. sensors, actuator) to become operational. The exception is the SAT sensor which will alarm immediately.

ECONOMIZING

AVAILABLE

NOT AVAILABLE

ENTHALPY RA HUM (%

RH)

R A

TE M

P TEMPERATURE

A B

S O

LU TE

H U

M ID

IT Y

ES5 ES4 ES3 ES2 ES1 HL

P1 (T,RH)

P2 (T,RH)

SINGLE ENTHALPY

DUAL ENTHALPY HIGH LIMIT

Table 20 Single Enthalpy and Dual Enthalpy High Limit Curves

ENTHALPY CURVE

TEMP. DRY BULB (F)

TEMP. DEWPOINT (F)

ENTHALPY (btu/lb/da)

POINT P1 POINT P2

TEMP. (F) HUMIDITY (%RH) TEMP. (F) HUMIDITY

(%RH) ES1 80 60 28.0 80 36.8 66.3 80.1 ES2 75 57 26.0 75 39.6 63.3 80.0 ES3 70 54 24.0 70 42.3 59.7 81.4 ES4 65 51 22.0 65 44.8 55.7 84.2 ES5 60 48 20.0 60 46.9 51.3 88.5 HL 86 66 32.4 86 38.9 72.4 80.3

CAUTION

EQUIPMENT DAMAGE HAZARD Failure to follow this caution may result in equipment damage. Be sure to allow enough time for compressor start-up and shutdown between checkout tests so that you do not short- cycle the compressors.

53

If one or more alarms are present and there has been no keypad ac- tivity for at least 5 minutes, the Alarms menu displays and cycles through the active alarms. You can also navigate to the Alarms menu at any time. Clearing Alarms Once the alarm has been identified and the cause has been re- moved (e.g. replaced faulty sensor) the alarm can be cleared from the display. To clear an alarm, perform the following: 1. Navigate to the desired alarm. 2. Press the (Enter) button. ERASE? displays.

3. Press the (Enter) button. ALARM ERASED displays. 4. Press the (Menu up/Exit) button to complete the

action and return to the previous menu. NOTE: If the alarm still exists after clearing it, it is redisplayed within 5 seconds.

Low Ambient Control (Factory Option) If the unit comes with Electro-Mechanical (EM) control, then no adjustment is necessary. See Fig. 73 and 74 for typical wiring diagrams.

If the unit comes with PremierLink or RTU Open control option, then refer to its installation control manual for details on adjusting Cooling Lock-Out setting and configuring for your specific job requirements.

Staged Air Volume (SAV) with Variable Fre- quency Drive (Factory Option) For details on operating 48HC 2 stage cooling units equipped with the factory-installed Staged Air Volume option, refer to the Vari- able Frequency Drive (VFD) Installation, Setup and Trouble- shooting Supplement.

ComfortLink Controls (Factory Option) For details on operating 48HC units equipped with the factory-in- stalled ComfortLink controls option, refer to Controls, Start-Up, Operation and Troubleshooting for 48/50HC 04-28 Single Pack- age Rooftop Unit with ComfortLink Controls. See Fig. 66-68 for wiring diagrams.

PremierLink Control For details on operating units equipped with the factory-installed PremierLink controller option, refer to the PremierLink Retrofit Rooftop Controller Version 3.x Installation, Start-Up, and Config- uration Instructions manual. See Fig. 69 and 70 for PremierLink wiring diagrams.

RTU Open Control System For details on operating units equipped with the factory-installed RTU Open controller, refer to the Factory-Installed RTU Open Multi-Protocol Controller Control, Start-Up, Operation and Trou- bleshooting manual. See Fig. 71 and 72 for RTU Open wiring diagrams.

Wiring Diagrams See Fig. 73-75 for unit wiring diagrams.

CAUTION

EQUIPMENT DAMAGE HAZARD Failure to follow this caution may result in equipment damage. Be sure to allow enough time for compressor start-up and shutdown between checkout tests so that you do not short- cycle the compressors.

54

Fig. 66 ComfortLink Control Wiring Diagram 48HC**17-28 Units

UNIT SIZES UNIT SIZES

55

Fig. 67 ComfortLink with Humid-MiZer Power Diagram and Component Arrangement 48HC**17-28 Units

56

Fig. 68 ComfortLink (without Humid-MiZer) Power Diagram and Component Arrangement 48/50HC 17-28 Units

57

Fig. 69 PremierLink Wiring Schematic

58

Fig. 70 PremierLink Wiring Schematic with Humidi-MiZer System Option

59

Fig. 71 RTU Open System Control Wiring Diagram

60

Fig. 72 RTU Open System Control Wiring Diagram with Humidi-MiZer System Option

61

Fig. 73 48HC**17-28 Electromechanical Control Wiring Diagram

62

Fig. 74 48HC**17-28 Typical Power Wiring Diagram (208/230v shown)

63

Fig. 75 48HC**17-28 Control Wiring Diagram with Humidi-MiZer System

64

Smoke Detectors Smoke detectors are available as factory-installed options on 48HC models. Smoke detectors may be specified for supply air only, for return air without or with economizer, or in combination of supply air and return air. Return-air smoke detectors are ar- ranged for vertical return configurations only. The unit is factory- configured for immediate smoke detector shutdown operation; ad- ditional wiring or modifications to unit terminal board may be necessary to complete the unit and smoke detector configuration to meet project requirements. RETURN AIR SENSOR TUBE INSTALLATION The return air sampling tube is shipped in the units supply fan section, attached to the blower housing (see Fig. 76. Its operating location is in the return air section of the unit (see Fig. 77, unit without economizer, or Fig. 78, unit with economizer), inserted into the return air sensor module housing which protrudes through the back of the control box. To install the return air sensor sampling tube: 1. Remove the tube from its shipping location. 2. Open the unit end to access the return air sensor (located on

right-hand partition). 3. Orient the tubes sampling holes into the return air flow direc-

tion. For vertical application, position the sampling holes on the bottom of the tube, facing into the bottom return duct opening. For horizontal application, position the sampling holes on the side of the tube, facing the units end panel.

4. Insert the sampling tube into the return air sensor module until the tube snaps into position.

5. Replace end panel or outside air hood.

SMOKE DETECTOR TEST MAGNET Locate the magnet; it is shipped in the control box area. ADDITIONAL APPLICATION DATA Refer to the Factory-Installed Smoke Detectors for Small and Medium Rooftop Units 2 to 25 Tons application data for discus- sions on additional control features of these smoke detectors in- cluding multiple unit coordination.

Fig. 76 Typical Supply Air Smoke Detector Sensor Location

Fig. 77 Return Air Sampling Tube Location in Unit without Economizer

Fig. 78 Return Air Sampling Tube Location in Unit with Economizer

ROTA TI

ON

RETURN AIR SAMPLING TUBE (SHIPPING LOCATION)

RETURN AIR DETECTOR SAMPLING TUBE

RETURN AIR DETECTOR SAMPLING TUBE

65

Fig. 79 EconoMi$er IV Wiring

Step 30 Adjust Factory-Installed Options ECONOMI$ER IV OCCUPANCY SWITCH Refer to Fig. 79 for general EconoMi$er IV wiring. External occu- pancy control is managed through a connection on the Central Terminal Board. If external occupancy control is desired, connect a time clock or remotely controlled switch (closed for Occupied, open for Unoc- cupied sequence) at terminals marked OCCUPANCY on CTB. Remove or cut jumper JMP 2 to complete the installation.

Step 31 Install Accessories Available accessories include: Roof Curb Thru-base connection kit (must be installed before unit is

set on curb) LP conversion kit Manual outside air damper High Altitude Gas kits Low Ambient Controls Thermostat / Sensors Two-Position motorized outside air damper EconoMi$er IV (with control and integrated barometric re-

lief) EconoMi$er2 (without control/for external signal and inte-

grated barometric relief) Power Exhaust Differential dry-bulb sensor (EconoMi$er IV) Outdoor enthalpy sensor Differential enthalpy sensor CO2 sensor DDC interface (PremierLink controller) Louvered hail guard Phase monitor control Winter Start kit

Refer to separate installation instructions for information on in- stalling these accessories.

Step 32 Check Belt Tension Measure the belt span length as shown in Fig. 80. Calculate the re- quired deflection by multiplying the belt span length by 1/64. For example, if the belt span length is 32 inches: 32 x 1/64 = 1/2 in. deflection. BELT FORCE DEFLECTION METHOD Check the belt tension with a spring-force belt force deflection gauge (available from drive belt manufacturer). 1. Place a straightedge along the belt between the 2 pulleys.

Measure the distance between the motor shaft and the blower shaft.

2. Set the tension gauge to the desired tension (see Table 1 in Fig. 80). Place the large O-ring at that point.

3. Press the tension checker downward on the belt until the large O-ring is at the bottom of the straightedge.

4. Adjust the belt tension as needed. Adjust belt tension by loosing the motor mounting plate front bolts and rear bolt (see Fig. 81) and slide the plate towards the fan (to reduce tension) or away from the fan (to increase tension). Ensure the blower shaft and motor shaft are parallel to each other (pulleys aligned). Tighten all bolts securely when finished.

ECONOMIZER 2 POSITION DAMPER UNIT WITHOUT ECONOMIZER OR 2 POSITION DAMPER

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480309-01 Printed in U.S.A. Form 48HC-17-28-04SI Rev. A Pg 66 11-21 Replaces: 48HC-17-28-03SI

2021 Carrier

Fig. 80 V-Belt Force Label

BELT TENSION METHOD Requires belt tension gauge that measures tension in belt in units of lbs force.

Fig. 81 Belt Drive Motor Mounting

Pre-Start and Start-Up This completes the mechanical installation of the unit. Refer to the units Service and Maintenance manual for detailed Pre-Start and Start-Up instructions.

TORQUE ALL SHEAVE SET SCREWS TO 110-130 in. lbs

SET SCREW

SET SCREW

STRAIGHT EDGE

BELT SPAN

BELT DEFLECTION FORCE - SEE TABLE 1

DEFLECTION = BELT SPAN 64

Table 1

Table 2

BELT CROSS

SECTION

SMALLEST SHEAVE

DIAMETER

BELT DEFLECTION FORCE (LBS) UNNOTCHED

BELTS NOTCHED BELTS

USED NEW USED NEW

A, AX 3.0-3.6 3.7 5.5 4.1 6.1 3.8-4.8 4.5 6.8 5.0 7.4 5.0-7.0 5.4 8.0 5.7 8.4

B, BX 3.4-4.2 4.9 7.2 4.4-5.6 5.3 7.9 7.1 10.5 5.8-8.6 6.3 9.4 8.5 12.6

BELT CONDITION TENSION FORCE IN BELT (LBS) New 100 Used 80

BLOWER PULLEY

V-BELT

MOTOR PULLEY

MOTOR

MOTOR MOUNTING PLATE

MOUNTING BOLTS (4)

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480309-01 Printed in U.S.A. Form 48HC-17-28-04SI Rev. A Pg CL-1 11-21 Replaces: 48HC-17-28-03SI

START-UP CHECKLIST (Remove and use for job file)

I. PRELIMINARY INFORMATION MODEL NO. _________________________________

JOB NAME___________________________________

SERIAL NO. _________________________________

ADDRESS ___________________________________

START-UP DATE______________________________

TECHNICIAN NAME ___________________________

ADDITIONAL ACCESSORIES

_____________________________________________________________________________________________________

II. PRE-START-UP Verify that job site voltage agrees with voltage listed on rating plate (Y/N) _____ Verify that all packaging materials have been removed from unit (Y/N) _____ Remove all shipping hold down bolts and brackets per installation instructions (Y/N) _____ Verify that condensate connection is installed per installation instructions (Y/N) _____ Verify that flue hood is installed (Y/N) _____ Check refrigerant piping for indications of leaks; investigate and repair if necessary (Y/N) _____ Check gas piping for leaks (Y/N) _____ Check all electrical connections and terminals for tightness (Y/N) _____ Check that return (indoor) air filters are clean and in place (Y/N) _____ Check that outdoor air inlet screens are in place (Y/N) _____ Verify that unit installation is level (Y/N) _____ Check fan wheels and propeller for location in housing/orifice and setscrew tightness (Y/N) _____ Check to ensure that electrical wiring is not in contact with refrigerant lines or sharp metal edges (Y/N) _____ Check pulley alignment and belt tension per installation instructions (Y/N) _____

III. START-UP (Refer to Unit Service/Maintenance Manual for Start-Up Instructions) ELECTRICAL Supply Voltage L1-L2_____________ L2-L3_____________ L3-L1_____________ Circuit 1 Compressor Amps L1 _____________ L2 _____________ L3 _____________ Circuit 2 Compressor Amps L1 _____________ L2 _____________ L3 _____________ Indoor Fan Amps L1 _____________ L2 _____________ L3 _____________ Outdoor Fan Amps NO.1 _____________ NO.2 _____________ NO.3 _____________

NO.4 _____________ NO.5 _____________ NO.6 _____________

TEMPERATURES Outdoor-Air Temperature _____________ F DB (Dry Bulb) _____________ F WB (Wet Bulb) Return-Air Temperature _____________ F DB _____________ F WB Cooling Supply Air Temperature _____________ F DB _____________ F WB Gas Heat Supply Air _____________ F DB _____________ F WB

PRESSURES (HEATING MODE) GAS INLET PRESSURE _____________ IN. WG GAS MANIFOLD PRESSURE _____________ IN. WG (Low Fire) _____________ IN. WG (High Fire)

NOTE: To avoid injury to personnel and damage to equipment or prop- erty when completing the procedures listed in this start-up checklist, use good judgment, follow safe practices, and adhere to the safety considerations/information as outlined in preceding sections of this Installation Instructions document.

Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations. Catalog No. 04-53480309-01 Printed in U.S.A. Form 48HC-17-28-04SI Rev. A Pg CL-2 11-21 Replaces: 48HC-17-28-03SI

2021 Carrier

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PRESSURES (COOLING MODE)

REFRIGERANT SUCTION CIRCUIT 1 _____________ PSIG _____________ F CIRCUIT 2 _____________ PSIG _____________ F

REFRIGERANT DISCHARGE CIRCUIT 1 _____________ PSIG _____________ F CIRCUIT 2 _____________ PSIG _____________ F

Verify that 3-phase fan motor and blower are rotating in correct direction (Y/N) _____ Verify that 3-phase scroll compressor is rotating in the correct direction (Y/N) _____ VERIFY REFRIGERANT CHARGE USING CHARGING CHARTS (Y/N) _____

GENERAL Economizer minimum vent and changeover settings to job requirements (if equipped) (Y/N) _____

IV. HUMIDI-MIZER START-UP

STEPS 1. Check CTB for jumper 5, 6, 7 (Jumper 5, 6, 7 must be cut and open) (Y/N) _____ 2. Open humidistat contacts (Y/N) _____ 3. Start unit In cooling (Close Y1) (Y/N) _____

OBSERVE AND RECORD A. Suction pressure _______________ PSIG B. Discharge pressure _______________ PSIG C. Entering air temperature _______________ F D. Liquid line temperature at outlet or reheat coil _______________ F E. Confirm correct rotation for compressor (Y/N) _____ F. Check for correct ramp-up of outdoor fan motor as condenser coil warms (Y/N) _____

4. Check unit charge per charging chart (Y/N) _____ (Jumper 32L Motormaster temperature sensor during this check. Remove jumper when complete.)

5. Switch unit to high-latent mode (sub-cooler) by closing humidistat with Y1 closed (Y/N) _____

OBSERVE A. Reduction in suction pressure (5 to 7 psi expected) (Y/N) _____ B. Discharge pressure unchanged (Y/N) _____ C. Liquid temperature drops to 50F to 55F range (Y/N) _____ D. LSV solenoid energized (valve closes) (Y/N) _____

6. Switch unit to dehumid (reheat) by opening Y1 (Y/N) _____

OBSERVE A. Suction pressure increases to normal cooling level (Y/N) _____ B. Discharge pressure decreases (35 to 50 psi) (Limited by Motormaster) (Y/N) _____ C. Liquid temperature returns to normal cooling level (Y/N) _____ D. LSV solenoid energized (valve closes) (Y/N) _____ E. DSV solenoid energized, valve opens (Y/N) _____

7. With unit in dehumid mode close W1 compressor and outdoor fan stop; LSV and DSV solenoids

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