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Lennox CBX32MV Installation Instructions PDF
Summary of Content for Lennox CBX32MV Installation Instructions PDF
Page 1
2016 Lennox Industries Inc. Dallas, Texas, USA
THIS MANUAL MUST BE LEFT WITH THE HOMEOWNER FOR FUTURE REFERENCE
WARNING This product contains a chemical known to the State of California to cause cancer, birth defects, or other repro ductive harm.
NOTICE A thermostat is not included and must be ordered separately.
A Lennox iComfort thermostat must be used in communicating applications.
In non-communicating applications, the Lennox ComfortSense thermostat may be used, as well as other non-communicating thermostats.
In all cases, setup is critical to ensure proper system operation.
Field wiring for both communicating and non- communicating applications is illustrated in diagrams, which begin on page 13.
INSTALLATION INSTRUCTIONS
Dave Lennox Signature
Collection CBX32MV Units
MULTI-POSITION AIR HANDLER 506274-01 11/2016
Table of Contents
Upflow/Downflow Unit Dimensions 2. . . . . . . . . . . . . . Horizontal LH/RH Unit Dimensions 3. . . . . . . . . . . . . . Shipping and Packing List 4. . . . . . . . . . . . . . . . . . . . . . Model Number Identification 4. . . . . . . . . . . . . . . . . . . . General 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installation Clearances 4. . . . . . . . . . . . . . . . . . . . . . . . . Requirements 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Installing the Unit 5. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Brazing Connections 9. . . . . . . . . . . . . . . . . . . . . . . . . . . Installing the Condensate Drain 11. . . . . . . . . . . . . . . . . Inspecting and Replacing Filters 12. . . . . . . . . . . . . . . . . Sealing the Unit 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Field Control Wiring 13. . . . . . . . . . . . . . . . . . . . . . . . . . . . Air Handler Control Button, Display and Jumpers 21. . Target CFM Tables 26. . . . . . . . . . . . . . . . . . . . . . . . . . . . Configuring Unit 30. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Error Code Recall Mode 37. . . . . . . . . . . . . . . . . . . . . . . . Indoor Blower Test 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Operation 38. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Cabinet Insulation 39. . . . . . . . . . . . . . . . . . . . . . . . . . . . . Homeowner Maintenance 39. . . . . . . . . . . . . . . . . . . . . . Checkout Procedures 40. . . . . . . . . . . . . . . . . . . . . . . . . .
IMPORTANT INFORMATION FOR INSTALLER
A B CHORIZONTAL DRAIN PAN (SEE UPFLOW APPLICATIONS ON PAGE 5 AND DOWNFLOW APPLICATIONS ON PAGE 8 )
BLOWER HOUSING SUPPORT PAD. REFRIGERANT LINE PLUGS (SEE BRAZING CONNECTION ON PAGE 9] .
CHECK FOR AND REMOVE THE FOLLOWING ITEMS BEFORE OPERATING UNIT.
FOR PROPER OPERATION THE ELECTRIC HEAT (IF APPLICABLE) MUST BE CONFIGURED (SET-UP) THROUGH THE AIR HANDLER CONTROL (AHC)
IMPORTANT: PRIOR TO RUNNING THE iComfort WiFi OR iComfort S30 INSTALLER SETUP, ELECTRIC HEAT MUST BE MANUALLY CONFIGURED.
ELECTRIC HEAT SECTIONS MUST BE CONFIGURED. IF INSTALLED, SEE PROCEDURE IN FIGURE 23 ON PAGE 32.
H
H
CONFIGURE ELECTRIC HEAT
ECB40
Page 2
Upflow and Downflow Unit Dimensions Inches (mm)
OPTIONAL ELECTRIC HEAT
(FIELD-INSTALLED)
AIR FLOW
LIQUID LINE
SUCTION LINE
SUPPLY AIR OPENING
RETURN AIRFILTER
LOW VOLTAGE INLETS (TOP AND
RIGHT SIDE)
RETURN AIR
TOP VIEW
FRONT VIEW SIDE VIEW
BLOWER
PIPING PLATE DETAIL (FOR UPFLOW AND DOWNFLOW POSITIONS)
A
B C
111/16 (281)
D
F E
LIQUID LINE
SUCTION LINE
CONDENSATE DRAINS (2) (HORIZONTAL)
COIL
3/4 (19)
3/4 (19)
5/8 (16)5/8 (16) 1 (25)
5/8 (16)
13/4 (44)
2 (51)
11/8 (29) 43/8 (111)
23/4 (70)
53/8 (137)
31/2 (89)
OPTIONAL ELECTRIC HEAT
(FIELD-INSTALLED) AIR FLOW
LIQUID LINE
SUCTION LINE
RETURN AIR
OPENING
SUPPLY AIR
FILTER
SUPPLY AIR
TOP VIEW
FRONT VIEWSIDE VIEW
BLOWER
A
BC
111/16 (281)
F
D
E
COIL
5/8 (16)5/8 (16)
5/8 (16)
5/8 (16)
5/8 (16)
LOW VOLTAGE (RIGHT SIDE)
LINE VOLTAGE (LEFT SIDE)
DOWNFLOW POSITION
1 (25)
UPFLOW POSITION
CONDENSATE DRAINS (2) (UPFLOW AND DOWNFLOW)
FILTER ACCESS
FILTER ACCESS
H
G
H
G
LINE VOLTAGE INLETS (TOP
AND LEFT SIDE)
5/8 (16)
5/8 (16)
KNOCKOUT FOR OPTIONAL HEALTHY CLIMATE GERMICIDAL UVC LIGHT.
KNOCKOUT FOR OPTIONAL HEALTHY CLIMATE GERMICIDAL UVC LIGHT.
Model Dimensions (Upflow, Downflow, Left- and Right-Hand Horizontal applications)
Dim. -018/024 -024/030 -036 -048 and -060 -068
in. (mm) in. (mm) in. (mm) in. (mm) in. (mm)
A 45-1/4 (1149) 49-1/4 (1251) 51 (1295) 581/2 (1486) 65 (1651)
B 16-1/4 (413) 21-1/4 (540) 211/4 (540) 211/4 (540) 21-1/4 (540)
C 20-5/8 (524) 20-5/8 (524) 225/8 (575) 245/8 (625) 26-5/8 (676)
D 14-3/4 (375) 19-3/4 (502) 193/4 (502) 193/4 (502) 19-3/4 (502)
E 19 (483) 19 (483) 21 (533) 23 (584) 25 (635)
F 15 (381) 20 (508) 20 (508) 20 (508) 20 (508)
G 24-5/8 (625) 24-5/8 (625) 263/8 (670) 277/8 (708) 32-3/8 (822)
H 20-5/8 (524) 24-5/8 (625) 245/8 (625) 305/8 (778) 32-5/8 (829)
Page 3
CBX32MV SERIES
Horizontal Left- and Right-Hand Unit Dimensions Inches (mm)
LIQUID LINE
SUCTION LINE
SUPPLY AIR
OPENING
FILTER
LOW VOLTAGE INLETS (BOTTOM
AND RIGHT SIDE)
TOP VIEW
FRONT VIEW
BLOWER
H
B
C
D
LIQUID LINE
SUCTION LINE
CONDENSATE DRAINS (2)
(UPFLOW AND DOWNFLOW)
CONDENSATE DRAINS (2)
(HORIZONTAL)
COIL
3/4 (19)
3/4 (19)
11/2 (38)
13/4 (44)
53/4 (46)
2 (51)
11/8 (29)
RETURN AIR OPENINGF
E
5/8 (16)
5/8 (16)
5/8 (16)
END VIEW
AIR FLOW
OPTIONAL ELECTRIC HEAT (FIELD-INSTALLED)
111/16 (281)
LINE VOLTAGE INLETS (TOP
AND RIGHT SIDE)
53/8 (137)
43/8 (111)
LIQUID LINE
SUCTION LINE
SUPPLY AIR
OPENING
FILTER
LOW VOLTAGE INLETS (TOP AND
LEFT SIDE)
END VIEW
BLOWER
B
C
D
COIL
3/4 (19)
3/4 (19)
3/4 (19)
RETURN AIR OPENING
F
E
5/8 (16)
5/8 (16)
5/8 (16)
END VIEW
AIR FLOW
OPTIONAL ELECTRIC HEAT (FIELD INSTALLED)
LINE VOLTAGE INLETS (BOTTOM AND LEFT SIDE)
Horizontal Position (RightHand Air
Discharge)
FILTER ACCESS
FILTER ACCESS
53/4 (146)
11/2 (38)
13/4 (44)
CONDENSATE DRAINS (2) (HORIZONTAL)
A 5/8 (16)G
H
A 5/8 (16)
G
1 (25)
1 (25)
111/16 (281)
PIPING PLATE DETAIL
LIQUID LINE
SUCTION LINE
2 (51)
11/8 (29)
53/8 (137)
43/8 (111)
PIPING PLATE DETAIL
Horizontal Position (LeftHand Air
Discharge)
TOP VIEW
FRONT VIEW
3/4 (19)
END VIEW
FOR DIMENSIONS A THROUGH H, SEE CHART ON PAGE 2.
Page 4
Model Number Identification
Refrigerant Type X = HFC-410A
230CB 32 036- 01
Series
Nominal Cooling Capacity 018/024 = 1.5 to 2 tons (5.3 to 7 kW) 024/030 = 2 to 2.5 tons (7 to 8.8 kW) 036 = 3 tons (10.6 kW) 048 = 4 tons (14.1 kW) 060 = 5 tons (17.6 kW)
Minor Revision Number
Configuration MV = Multi-Position, Variable
speed blower motor
-X
Voltage 230 = 208/230V-60hz-1ph
- -6
Refrigerant Metering Device 2 = Fixed Orifice 3 = TXV - Bleed port (indoor unit) 4 = TXV - Non-bleed port (indoor unit) 5 = TXV - Non-bleed port (outdoor unit) 6 = TXV - R410A Non-bleed port (indoor unit)
MV
Unit Type CB = Air Handler
Shipping and Packing List
Check unit for shipping damage. Consult last carrier immediately if damage is found.
Package 1 of 1 contains the following:
1 Assembled air handler unit
2 Downflow shields and foam tapes (only required for downflow configuration)
1 Drip shield (for -068 only)
1 Pipe nipple (Sch 80, 3/4" I. D. x 5")
1 Warranty card
General
This indoor unit is designed for installation with optional field-installed electric heat and a matched outdoor unit that is charged with HFC-410A refrigerant. These units, designed for indoor installation in multiple positions, are completely assembled for upflow and horizontal right-hand discharge before being shipped from the factory.
All CBX32MV air handlers are equipped with a factory-installed, internally mounted check / expansion valve, which is suitable for use in HFC-410A applications.
This air handler is compatible with the ComfortSense
non-communicating thermostat and non-communicating outdoor units. In addition, this unit has the enhanced capability of communicating with the iComfort thermostats and iComfort-enabled outdoor units using the Lennox RSBus protocols.
NOTE - For downflow or horizontal left-hand air discharge,
certain field modifications are required.
These instructions are intended as a general guide and do not supersede local or national codes in any way. Consult authorities having jurisdiction before installation. Check equipment for shipping damage; if found, immediately report damage to the last carrier.
Installation Clearances
Cabinet 0 inch (0 mm)
To Plenum 1 inch (25 mm)
To Outlet Duct within 3 feet (914 mm)
1 inch (25 mm)
Floor See Note #1
Service / Maintenance See Note #2
1 Units installed on combustible floors in the down-flow position with electric heat require optional down-flow additive base.
2 Front service access - 24 inches (610mm) minimum.
NOTE - If cabinet depth is more than 24 inches (610 mm),
allow a minimum of the cabinet depth plus 2 inches (51
mm).
IMPORTANT The Clean Air Act of 1990 bans the intentional venting of refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992. Approved methods of recovery, recycling or reclaiming must be followed. Fines and/or incarceration may be levied for noncompliance.
WARNING During blower operation, the ECM motor emits energy that may interfere with pacemaker operation. Interference is reduced by both the sheet metal cabinet and distance.
CAUTION As with any mechanical equipment, contact with sharp sheet metal edges can result in personal injury. Take care while handling this equipment and wear gloves and protective clothing.
Page 5
CBX32MV SERIES
WARNING Improper installation, adjustment, alteration, service or maintenance can cause personal injury, loss of life, or damage to property.
Installation and service must be performed by a licensed professional installer (or equivalent) or a service agency.
WARNING Improper installation of the air handler can result in personal injury or death.
Do not allow external combustion products or other contaminants to enter the return air system or to be mixed with air that will be supplied to the living space. Use sheet metal screws and joint tape or duct mastic to seal return air system to air handler. In platform installations, the air handler should be sealed airtight to the return air plenum. A door must never be used as a portion of the return air duct system. The base must provide a stable support and an airtight seal to the air handler. Allow absolutely no sagging, cracks, gaps. etc.
For no reason should return and supply air duct systems ever be connected to or from other heating devices such as a fireplace or stove. etc. Fire, explosion, carbon monoxide poisoning, personal injury and/or property damage could result.
Requirements
In addition to conforming to manufacturer's installation instructions and local municipal building codes, installation of Lennox air handler units (with or without optional electric heat), MUST conform with the following National Fire Protection Association (NFPA) standards:
NFPA No. 90A Standard for Installation of Air Conditioning and Ventilation Systems
NFPA No. 90B Standard for Installation of Residence Type Warm Air Heating and Air Conditioning Systems
This unit is approved for installation clearance to combustible material as stated on the unit rating plate. Accessibility and service clearances must take precedence over combustible material clearances.
Installing the Unit
CBX32MV units are factory-configured for upflow and horizontal right-hand discharge installation. For downflow or horizontal left-hand discharge, certain field modifications are required.
DISASSEMBLE AND REASSEMBLE AIR HANDLER UNIT
This unit consists of two sections which are shipped assembled from the factory. If necessary, the unit may be disassembled to facilitate setting the unit. Follow the steps below:
To disassemble:
1. Remove access panels.
2. Remove both blower and coil assemblies. This will lighten the cabinet for lifting.
3. Remove one screw from the left and right posts inside the unit. Remove one screw from each side on the back of the unit. Unit sections will now separate.
To reassemble:
1. Align cabinet sections together.
2. Reinstall screws.
3. Replace blower and coil assemblies.
4. Replace access panel.
UPFLOW APPLICATION
Use the following procedures to configure the unit for upflow operations:
HORIZONTAL DRAIN PAN (MUST BE REMOVED)
UPFLOW/ DOWNFLOW DRAIN PAN
Figure 1. Upflow Configuration
NOTE - (-068 model Only) Remove access panels and
the horizontal drip shield along with the corrugated
padding between the blower and coil assembly before
operation. Discard drip shields from the foam pads on top
of the unit. Shields are used for downflow applications only.
1. The horizontal drain pan must be removed when the coil blower is installed in the upflow position. Removing horizontal drain pain will allow proper air flow and increase efficiency.
2. After removing horizontal drain pan, place the unit in desired location. Set unit so that it is level. Connect return and supply air plenums as required using sheet metal screws as illustrated in figure 1.
3. Install units that have no return air plenum on a stand that is at least 14 from the floor to allow for proper air return. Lennox offers an optional upflow unit stand as listed in table 1.
Table 1. Optional Unit Side Stand (Upflow Only)
Models Kit Numbers
-018/024 45K31
-024/030, -036, -048 and -060 45K32
Page 6
HORIZONTAL RIGHT-HAND DISCHARGE APPLICATION
NOTE - When air handler is located above a finished space, the secondary drain pan must have a larger footprint than the air handler. In addition, a 3/4 (19.1MM) overflow drain line must be:
Connected to secondary drain pan
or
Connected to the overflow drain outlet of the air handler drain pan.
Use the following procedures to configure the unit for horizontal right-hand discharge operations:
NOTE - For horizontal applications, a secondary drain pan
is recommended. Refer to local codes.
NOTE - (-068 Model Only) Before operating the unit,
remove access panels and the horizontal drip shield and
the corrugated padding between the blower and coil
assembly. Discard the corrugated padding and the
downflow drip shields from the foam pads on top of the
unit.
NOTE - (-068 Model Only) Install the horizontal shield on
the front edge of the horizontal drain pan as illustrated in
figure 2.
1. No further adjustment is necessary. Set unit so that it is sloped 1/4 inch (6.35mm) towards the drain pan end of the unit.
NO ADJUSTMENT IS NECESSARY
HORIZONTAL DRIP SHIELD (-068 MODELS)
UP-LOAD / DOWNFLOW DRAIN PAN
HORIZONTAL DRAIN PAN
DOWNFLOW RAIL
Figure 2. Right-Hand Discharge Configuration
2. If the unit is suspended, the entire length of the cabinet must be supported. If you use a chain or strap, use a piece of angle iron or sheet metal attached to the unit (either above or below) to support the length of the cabinet. Use securing screws no longer than 1/2 inch (12.7mm) to avoid damaging the coil or filter as illustrated in figure 3. Use sheet metal screws to connect the return and supply air plenums as required.
HORIZONTAL RIGHT-HAND DISCHARGE APPLICATION IN HIGH HUMIDITY AREAS
For horizontal applications in high humidity areas remove the downflow rail closest to the drain pan.
To remove rail:
1. Remove the screws from the rail at the back of unit and at the cabinet support rail.
2. Remove the downflow rail then replace screws.
3. Seal around the exiting drain pipe, liquid line, and suction line to prevent humid air from infiltrating into the unit.
IMPORTANT When removing the coil, there is possible danger of equipment damage and personal injury. Be careful when removing the coil assembly from a unit installed in right- or left-hand applications. The coil may tip into the drain pan once it is clear of the cabinet. Support the coil when removing it.
FRONT VIEW END VIEW
ANGLE IRON OR SHEET METAL
ELECTRICAL INLET CLEARANCE 4 IN. (102 MM)
1/2 IN. SCREWS MAXIMUM
Figure 3. Suspending Horizontal Unit
HORIZONTAL LEFT-HAND DISCHARGE APPLICATION
Use the following procedures to configure the unit for horizontal left-hand discharge operations:
NOTE For horizontal applications, a secondary drain
pan is recommended. Refer to local codes.
NOTE (-068 Model Only) Remove access panels and
horizontal drip shield from the corrugated padding
between the blower and coil assembly. Discard the
corrugated padding and the downflow drip shields from the
foam pads on top of the unit. (The shields are used for
downflow applications only.)
Page 7
CBX32MV SERIES
90 BEND
CABINET SUPPORT
COIL SHOWN IN UPFLOW POSITION FOR EASY CONVERSION (LEFT-HAND AIR DISCHARGE)
TOP CAP SCREWS
DRAIN PAN REINSTALLED
HERE
DRAIN PAN SHIPPING LOCATION
TOP CAP ROTATED TO CORRECT POSITION
DRAIN PLUGS REINSTALLED HERE REMOVED FROM HERE
BACK COIL END SEAL
TOP CAP
90 BEND
INSTALL DRAIN PAN BETWEEN TAB AND
EXTERIOR INNER WALL.
DETAIL A
DETAIL B
DETAIL C
HORIZONTAL DRIP SHIELD SCREW (FRONT COIL END SEAL)
FRONT VIEW
3/16 PLASTIC PLUG (REAR COIL END SEAL)
ALIGN HOLES WITH HOLES IN COIL END PLATE. STARTING WITH THE ROUND HOLES ON THIS END.
Figure 4. Field Modification for Left-Hand Discharge
IMPORTANT After removal of drain pan plug(s), check drain hole(s) to verify that drain opening is fully open and free of any debris. Also check to make sure that no debris has fallen into the drain pan during installation that may plug up the drain opening.
1. Pull the coil assembly from unit. Pull off the horizontal drain pan.
2. Remove the drain plugs from back drain holes on horizontal drain pan and reinstall them on front holes.
3. Rotate drain pan 180 fronttoback and install it on the opposite side of the coil.
4. Remove screws from top cap as illustrated in figure 4, detail A.
5. Remove horizontal drip shield screw located in the left center of the back coil end seal as illustrated in figure 4, detail A.
6. Rotate horizontal drip shield 180 front to back.
7. Remove plastic plug from hole located on the left center of front coil end seal and reinstall plug in back hole on rear coil end seal.
8. Reinstall horizontal drip shield screw in front coil end seal. Drip shield should drain downward into horizontal drain pan inside coil.
9. Rotate top cap 180 fronttoback and align with unused screw holes. Holes must align with front and back coil end plates. The top cap has a 45 bend on one side and a 90 bend on the other. The 90 bend must be on the same side as the horizontal drain pan as illustrated in figure 4, detail B.
NOTE Be very careful when you reinstall the screws into
coil end plate engaging holes. Misaligned screws may
damage the coil.
HORIZONTAL DRIP SHIELD (-068 MODEL)
DOWNFLOW RAIL FRONT EDGE OF HORIZONTAL
DRAIN PAN
Figure 5. Left-Hand Discharge Configuration
10. From the upload position, flip cabinet 90 to the left and set into place. Replace coil assembly. Replace coil assembly. Install drain pan between exterior inner wall and tab as illustrated in figure 4, detail C.
11. (-068 Model Only) Install the horizontal shield on the front edge of the horizontal drain pan as shown in figure 5.
Page 8
NOTE For horizontal applications in high humidity
areas, remove the downflow rail closest to the drain pan.
To remove rail, remove screw from rail at back of unit and
at cabinet support rail. Remove downflow rail then replace
screws. Also, seal around the exiting drain pipe, liquid and
suction lines to prevent infiltration of humid air.
12. Knock out drain seal plate from access door. Secure plate to cabinet front flange with screw provided.
13. Flip access door and replace it on the unit.
14. Set unit so that it is sloped 1/4 inch (6.35mm) toward the drain pan end of the unit. Connect return and supply air plenums as required using sheet metal screws.
15. If suspending the unit, it must be supported along the entire length of the cabinet. If using chain or strap, use a piece of angle iron or sheet metal attached to the unit (either above or below) so that the full length of the cabinet is supported. Use securing screws no longer than 1/2 inch (12.7mm) to avoid damage to coil or filter as illustrated in figure 3 on page 6. Connect return and supply air plenums as required using sheet metal screws.
DOWNFLOW APPLICATION
Use the following procedures to configure the unit for
downflow operations:
CAUTION If electric heat section with circuit breakers (ECB29/ECB31) is applied to downflow CBX32MV unit, the circuit breakers must be rotated 180 to the UP position. See ECB29/ECB31 installation instructions for more details.
Table 2 outlines the sizes of the various drip shields.
NOTE (-068 Model Only) Remove access panels and
horizontal drip shield from the corrugated padding
between the blower and coil assembly.
NOTE Discard the corrugated padding and the
downflow drip shields from the foam pads on top of the
unit. (The shields are used for downflow applications only.)
1. Remove the coil assembly from the unit.
2. For best efficiency and air flow, remove the horizontal drain pan from the units in downflow positions as
illustrated in figure 6 on page 8.
3. Rotate cabinet 180 from the upright position. See
figure 6. You may need to first remove the blower assembly to lighten the cabinet for lifting.
4. Foam tape that is provided creates a seal between the
drip shield and the coil so that water does not leak into the air stream. The foam tape pieces are precut. Apply
the tape to the drip shields as illustrated in figure 7 and specified as follows:
Apply two pieces of foam tape provided down both ends of each shield. The tape should measure 4-3/4 X 2 (120 X 25 mm). Ensure that the tape covers both sides of the shield equally.
Apply the longer piece of 1inch wide foam tape between the end pieces of tape.
5. From the underside of the coil, install the downflow drip shield firmly in place as illustrated in figure 8.
Table 2. Downflow Drip Shields (Tape Required)
Units Length Width
-018/024 Not Required Not Required
-024/030 15-7/8 4-11/16
-036 17-7/8 4-11/16
-048, -060, and -068 19-7/8 4-11/16
HORIZONTAL DRAIN PAN (REMOVE FROM UNIT)
UP-LOAD / DOWNFLOW DRAIN PAN
Figure 6. Downflow Discharge Position
SIDE VIEW
2 WIDE FOAM TAPE
DRIP SHIELD
1 WIDE FOAM TAPE (LONGER PIECE)
Figure 7. Applying Foam Tape to Drip Shield
COIL DRIP SHIELD
DRIP PAN
Figure 8. Downflow Drip Shields
6. Replace the coil assembly and blower if you have
removed it. Replace the coil access panel.
Page 9
CBX32MV SERIES
7. Set the unit so that it is level. Using sheet metal screws, connect the return and supply air plenums as required.
NOTE - For downflow application, metal or class I supply
and return air plenums must be used.
COMBUSTIBLE FLOOR ADDITIVE BASE
PROPERLY SIZED FLOOR OPENING
AIR HANDER
UNIT
Figure 9. Downflow Combustible Flooring Base
8. For downflow installation on combustible flooring, an additive base must be used as illustrated in figure 9 on
page 9. See CBX32MV Engineering Handbook for downlfow combustible flooring base kits available for
this air handler.
9. Cut an opening appropriately sized for combustible base. Base dimensions are illustrated in figure 10.
After opening has been cut, set the additive base into opening. Connect outlet air plenum to the additive
base. Set the unit on the additive base so flanges of the unit drop into the base opening and seal against
the insulation strips. The unit is now locked in place. Install return air plenum and secure with sheet metal
screws.
TOP VIEW
OPENING
15/8 (41)
SIDE VIEW
15/8 (41)
113/8 (289)
2 (51)
15/8 (41)
24 (610) -068 ONLY
221/8 (562) OTHER MODELS
5/8 (16) 133/8 (340)
SUPPLY AIR OPENING
INCHES (MM)
-018/-024 08-1/4 (464)
-024/-030 and up 23-1/4 (591)
-018/-024 15 (381)
-024/-030 AND UP 20 (508)
Figure 10. Downflow Combustible Base Dimensions
Brazing Connections
WARNING Polyol ester (POE) oils used with HFC-410A
refrigerant absorb moisture very quickly. It is very
important that the refrigerant system be kept closed as
much as possible. DO NOT remove line set caps or
service valve stub caps until you are ready to make
connections.
WARNING Danger of fire. Bleeding the refrigerant charge from only the high side may result in the low side shell and suction tubing being pressurized. Application of a brazing torch while pressurized may result in ignition of the refrigerant and oil mixture - check the high and low pressures before unbrazing.
WARNING When using a high pressure gas such as dry nitrogen to pressurize a refrigeration or air conditioning system, use a regulator that can control the pressure down to 1 or 2 psig (6.9 to 13.8 kPa).
CAUTION Brazing alloys and flux contain materials which are hazardous to your health.
Avoid breathing vapors or fumes from brazing operations. Perform operations only in well ventilated areas.
Wear gloves and protective goggles or face shield to protect against burns.
Wash hands with soap and water after handling brazing alloys and flux.
IMPORTANT To prevent the build up of high levels of nitrogen when purging, be sure it is done in a well ventilated area. Purge low pressure nitrogen (1 to 2 psig) through the refrigerant piping during brazing. This will help to prevent oxidation and the introduction of moisture into a system.
Page 10
REMOVE ACCESS PANELA
REMOVE RUBBER PLUG FROM BOTH LIQUID AND SUCTION LINES
B
USE A WET RAG TO PROTECT CTXV SENSING BULB WHEN BRAZING SUCTION LINE CONNECTIONS.
C
NITROGEN
HIGHLOW
EITHER REMOVE OR PUSH PIPE WRAPPING BACK THROUGH HOLE IN PIPING PLATE BEFORE LINE SET CONNECTION AND BRAZING.
D
E CONNECT PIPES
F CONNECT GAUGES AND START NITROGEN FLOW
G PLACE A WET RAG AGAINST PIPING PLATE AND AROUND THE SUCTION LINE CONNECTION. A
H BRAZE CONNECTION. ALLOW PIPE TO COOL BEFORE REMOVING WET RAG FROM CTXV SENSING BULB AND PIPING PANEL AREA.
I REPEAT PREVIOUS PROCEDURE FOR LIQUID LINE.
NOTE REFER TO OUTDOOR UNIT INSTALLATION INSTRUCTIONS FOR REFRIGERANT PIPING SIZE REQUIREMENTS.
NOTE REFRIGERANT LINE SETS SHOULD BE ROUTED TO ALLOW FILTER ACCESSIBILITY.
NOTE CBX32MV SERIES UNITS USE NITROGEN OR DRY AIR AS A HOLDING CHARGE. IF THERE IS NO PRESSURE WHEN THE RUBBER PLUGS ARE REMOVED, CHECK THE COIL FOR LEAKS BEFORE INSTALLING.
REFER TO INSTRUCTIONS PROVIDED WITH OUTDOOR UNIT FOR LEAK TESTING, EVACUATING AND CHARGING PROCEDURES
FLOW REGULATED NITROGEN (AT 1 TO 2 PSIG) THROUGH THE REFRIGERATION GAUGE SET INTO THE VALVE STEM PORT CONNECTION ON THE OUTDOOR UNIT LIQUID LINE SERVICE VALVE AND OUT OF THE VALVE STEM PORT CONNECTION ON THE SUCTION SERVICE VALVE.
PIPING PLATE
NOTE - Use silver alloy brazing rods with five or six percent minimum silver alloy for copper-to-copper brazing, 45 percent alloy for copper-to-brass and copper-to-steel brazing.
PLEASE READ IMPORTANT ISSUES CONCERNING BRAZING OPERATIONS ON PAGE 10 BEFORE PROCEEDING.
Figure 11. Brazing Connections
Page 11
CBX32MV SERIES
Table 3. CBX32MV Refrigerant Connections and Line Set Requirements
Models Liquid Line
Vapor / Suction Line
L15 Line Set
-018/024 3/8 (10mm)
5/8 (16mm) L15 line set sizes are
dependent on unit matchups. See CBX32MV Engineering Handbook to determine correct line set sizes.
-024/030 and -036
3/8 (10mm)
3/4 (19mm)
-048 3/8 (10mm)
7/8 (22mm)
-060 3/8 (10mm)
7/8 (22mm)
Field-fabricated
-068 3/8 (10mm)
1-1/8 (29mm)
NOTE Some applications may require a field provided 7/8 to 1-1/8 adapter
NOTE When installing refrigerant lines longer than 50 feet, see the Lennox Refrigerant Piping Design and Fabrication Guidelines, CORP. 9351-L9, or contact Lennox Technical Support Product Applications for assistance. To obtain the correct information from Lennox, be sure to communicate the following information:
Installing the Condensate Drain
IMPORTANT After removal of drain pan plug(s), check drain hole(s) to verify that drain opening is fully open and free of any debris. Also check to make sure that no debris has fallen into the drain pan during installation that may plug up the drain opening.
MAIN DRAIN
Connect the main drain and route downward to drain line or sump. Do not connect drain to a closed waste system. See Figure 13 for typical drain trap configuration.
OVERFLOW DRAIN
It is recommended that the overflow drain is connected to a overflow drain line for all units. If overflow drain is not connected, it must be plugged with provided cap.
For downflow orientation, the overflow drain MUST be connected and routed to a overflow drain line.See Figure 13 for main and overflow drain locations based on coil orientation.
LEFT-HAND AIR DISCHARGE
MAIN DRAIN ON RIGHT
OVERFLOW DRAIN ON LEFT
UPFLOW OR DOWNFLOW
RIGHT-HAND AIR DISCHARGE
Figure 12. Main and Overflow Drain Locations based on Coil Orientation
BEST PRACTICES
The following best practices are recommended to ensure better condensate removal:
Main and overflow drain lines should NOT be smaller than both drain connections at drain pan.
Overflow drain line should run to an area where homeowner will notice drainage.
It is recommended that the overflow drain line be
vented and a trap installed. Refer to local codes.
Page 12
ABOVE FINISHED SPACE?
OVERFLOW DRAIN LINE
ALWAYS RUN AN OVERFLOW DRAIN LINE. IF NOT POSSIBLE TO ROUTE OVERFLOW DRAIN LINE, INSTALL LOW VOLTAGE OVERFLOW SWITCH KIT. WIRE KIT TO SHUT DOWN COMPRESSOR PER INSTRUCTIONS.
NO
YES
LENNOX # X3169
CLEAN OUT
VENT
PRESS IN (DO NOT GLUE)
VENT MUST EXTEND ABOVE HEIGHT OF COIL DRAIN PAN BY TWO INCHES (51MM)
1 X 3/4 X 3/4 REDUCING TEE WITH
PLUG
LENNOX1 P-TRAP 49P66, J-TRAP # 91P90 OR ANY
PVC SCH 40 P- OR J-TRAP 3/4
OVERFLOW DRAIN
AIR HANDLER DRAIN PAN
WHEN A COIL IS LOCATED ABOVE A FINISHED SPACE, A 3/4 (19.1MM) SECONDARY DRAIN LINE MUST BE:
CONNECTED TO SECONDARY DRAIN PAN
OR
CONNECTED TO THE OVERFLOW DRAIN OUTLET OF
THE AIR HANDLER DRAIN PAN.
TRAPS MUST BE DEEP ENOUGH TO OFFSET MAXIMUM STATIC DIFFERENCES GENERALLY, TWO INCHES (51MM).
DRAIN LINE SHOULD SLOPE A MINIMUM OF ONE INCH PER 10 FEET (25MM PER 3 METERS)
NOTE WHEN A AIR HANDLER IS LOCATED ABOVE A FINISHED SPACE THE SECONDARY DRAIN PAN MUST HAVE A LARGER FOOTPRINT THAN THE AIR HANDLER.
MAIN DRAIN
TO APPROVED DRAIN
FOR NEGATIVE PRESSURE COILS (BLOWER AFTER COIL) TRAPS ARE REQUIRED ON ALL DRAIN LINES CONNECTED TO COIL.
COMPACT OVERFLOW SWITCH WITH 3/4 FEMALE SLIP INLET AND MALE ADAPTER, TWO PART DESIGN FOR USE WHERE OBSTRUCTIONS PREVENT DIRECT THREADING
SECONDARY DRAIN PAN
2 (51MM)
TRAP DEPTH
1 LENNOX P-TRAP 49P66 REQUIRES A LARGER INSTALLATION SPACE THAN THE J-TRAP 91P90.
2 PIPE NIPPLE PROVIDED IN BAG ASSEMBLY - SCH 80, 3/4 I. D. X 5 - 34K7401 (1): CUT THE PIPE IN HALF AND USE IT TO ROUTE THE MAIN DRAIN.
MAIN DRAIN
PROVIDED PIPE NIPPLE 2
CUT TO REQUIRED
LENGTH
SIDE VIEW
Figure 13. Typical Main and Overflow Drain Installations
Inspecting and Replacing Filters
IMPORTANT Filter access door must be in place during unit operation. Excessive warm air entering the unit from unconditioned space may result in water blow-off problems.
Filters may be duct-mounted or installed in the cabinet. A filter is installed at the factory. Note that filter access door fits over access panel. Air will leak if the access panel is placed over the filter door.
Filters should be inspected monthly and must be cleaned or replaced when dirty to assure proper furnace operation.
To replace filter:
1. Loosen the thumbscrews holding the filter panel in place.
2. Slide the filter out of the guides on either side of cabinet.
3. Insert new filter.
4. Replace panel.
See table 4 for replacement filter sizes.
Table 4. Filter Dimensions Unit Model No. Filter Size Inches (mm)
-018/024 15 X 20 x 1(381 x 508 x 25)
-024/030 20 x 20 x 1(508 x 508 x 25)
-036 and -042 20 x 20 x 1(508 x 508 x 25)
-048 and -060 20 x 24 x 1(508 x 610 x 25)
-068 20 x 25 x 1(508 x 635 x 25)
Sealing the Unit
WARNING There must be an airtight seal between the bottom of the air handler and the return air plenum. Use fiberglass sealing strips, caulking, or equivalent sealing method between the plenum and the air handler cabinet to ensure a tight seal. Return air must not be drawn from a room where this air handler or any gas-fueled appliance (i.e., water heater), or carbon monoxide-producing device (i.e., wood fireplace) is installed.
Page 13
CBX32MV SERIES
Seal the unit so that warm air is not allowed into the cabinet. Warm air introduces moisture, which results in water blow-off problems. This is especially important when the unit is installed in an unconditioned area.
Make sure the liquid line and suction line entry points are sealed with either the provided flexible elastomeric thermal insulation, or field provided material (e.g. Armaflex, Permagum or equivalent). Any of the previously mention materials may be used to seal around the main and auxiliary drains, and around open areas of electrical inlets.
Field Control Wiring
WARNING Electric Shock Hazard.
Can cause injury or death.
Foilfaced insulation has conductive characteristics sim ilar to metal. Be sure there are no electrical connections within a of the insulation. If the foilfaced insulation comes in contact with electrical voltage, the foil could provide a path for current to pass through to the outer metal cabinet. While the current produced may not be enough to trip existing electrical safety devices (e.g. fuses or circuit breakers), the current can be enough to cause an electric shock hazard that could cause person al injury or death.
Wiring must conform to the current National Electric Code ANSI/NFPA No. 70, or Canadian Electric Code Part I, CSA Standard C22.1, and local building codes. Refer to following wiring diagrams. See unit nameplate for minimum circuit ampacity and maximum over-current protection size.
WARNING Run 24V Class II wiring only through specified low volt age opening. Run line voltage wiring only through speci fied high voltage opening. Do not combine voltage in one opening.
Select the proper supply circuit conductors in accordance with tables 310-16 and 310-17 in the National Electric Code, ANSI/NFPA No. 70 or tables 1 through 4 in the Canadian Electric Code, Part I, CSA Standard C22.1.
Separate openings have been provided for 24V low voltage and line voltage. Refer to the dimension illustration of specific location.
CAUTION USE COPPER CONDUCTORS ONLY.
WIRING CONNECTIONS
1. Install line voltage power supply to unit from a proper circuit breaker. Confirm line voltage. Check that correct transformer line tap is connected (208 or 240V).
2. Ground unit at unit disconnect switch or to an earth ground.
NOTE Connect conduit to the unit using a proper
conduit fitting. Units are approved for use only with
copper conductors. A complete unit wiring diagram is
located on the back side of the unit's access panel.
3. Install low voltage wiring from outdoor to indoor unit and from thermostat to indoor unit.
NOTE For proper voltages, select control wiring gauge
per the charts on page 18.
Page 14
Figure 14. CBX32MV Air Handler Unit Typical Wiring Diagram
Page 15
CBX32MV SERIES
SENSOR (CENTER SIDE-T0 -SIDE)
9-PIN CONNECTOR
SECURING SCREWS
AIR HANDLER CONTROL
AIR HANDLER CONTROL L-BRACKET MOUNTING PLATE
19 IN. (483 MM)
5-1/2 IN. (140 MM)
9-PIN CONNECTOR
ELECTRIC HEAT RELAY PART NO. 49W91
22V DIRECT CURRENT COIL
30 AMP CONTACT RATING
FASTEN THE PROBE BRACKET TO THE
PLENUM WITH TWO SELF-TAPPING SHEET
METAL SCREWS.
CONNECT WIRES TO DISCHARGE AIR SENSOR TERMINAL ON AIR HANDLER CONTROL.
PLENUM
CBX32MV AIR HANDLER CONTROL PART NO. 50W28
DISCHARGE SENSOR
(DAT)
TEMP RESISTANCE F (OHMS) 30 34,566 40 26,106 50 19,904 60 15,313 70 11,884 80 9,298 90 7,332 100 5,826
DETAIL A
NOTE EVENHEAT MODE CANNOT BE ENABLED WITH HARMONY III DUE TO EACH CONTROL REQUIRING ITS OWN DISCHARGE AIR SENSOR.
THE AIR HANDLER CONTROL (AHC) HAS TWO SCREW TERMINALS MARKED DISCHARGE AIR SENSOR. THE SENSOR IS REQUIRED FOR EVENHEAT OPERATION, IS FIELD-MOUNTED AND MUST BE ORDERED SEPARATELY (CATALOG # 88K38).
DETAIL B
TEMPERATURE RESISTANCE CHART
NOTE - Due to varying duct designs and air flow conditions, relocation of the discharge sensor may be required to insure accurate sensing.
Figure 15. Component Connections
Page 16
AIR HANDLER CONTROL COMES FROM FACTORY WITH A METAL JUMPERS BETWEEN W1 TO W2 AND W2 TO W3. SEE FIGURE 21 FOR HEAT SECTION CONFIGURATION.
L CONNECTION WIRED ON UNITS WITH LSOM.
CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION TERMINAL IS USED.
CBX32MV COMFORTSENSE 7000
AIR CONDITIONER UNIT (TWO-STAGE)
RED
BROWN
YELLOW
BLUE
BLACK
1
1
2
2
3
3
R
W3
W2
W1
O
Y1
Y2
G
DS
C
R
H
W2
W1
O
L
Y1
Y2
G
D
B
C
Y1-Y2 2-STAGE COMPR
R-O HEAT PUMP
R-DS DEHUM
OR HARMONY
C U
T F
O R
O P
T IO
N
CUT ON-BOARD LINK Y1-Y2 FOR TWO-STAGE AC
DO NOT CUT ON-BOARD LINK R -O.
IMPORTANT USE CARE WHEN CUTTING LINKS TO PREVENT DAMAGE TO CONTROL. SEE FIGURE 20, CBX32MV JUMP AND LINK GUIDE FOR FURTHER DETAILS.
AIR HANDLER CONTROL
CONNECTED ON UNIT WITH LSOM. RESISTOR KIT (CAT # 47W97) IS REQUIRED WHEN CONNECTING THE COMFORTSENSE 7000 (CATALOG# Y0349) WITH THE LSOM 2. RESISTOR KIT NOT REQUIRED WHEN USING COMFORTSENSE 7000 CATALOG# Y2081).
Figure 16. Control (Field Wiring) Cooling Application (Non-Communicating)
HEAT PUMP UNIT
(TWO-STAGE) X2658 OUTDOOR SENSOR IS REQUIRED FOR OUTDOOR TEMPERATURE DISPLAY, DEW POINT CONTROL, HEAT PUMP AND DUAL FUEL BALANCE POINTS.
COMFORTSENSE 7000
R R R
W3 H
W2W2
W1 W1 W1
OOO
LL
Y1Y1Y1
Y2Y2
GG
C C C
T
T
D
BY2
DS
O. D. SENSOR (X2658)
Y2 OUT BL
1
1
CUT ON-BOARD LINK R -O.
CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION TERMINAL IS USED.
CUT ON-BOARD LINK Y1-Y2 FOR TWO-STAGE HP
2
2
3
3 FIELD PROVIDED JUMPER BETWEEN Y2 OUT BL ON HEAT PUMP TO Y2 ON CX32MV.
CONNECTED ON UNIT WITH LSOM. RESISTOR KIT (CAT # 47W97) IS REQUIRED WHEN CONNECTING THE COMFORTSENSE 7000 (CATALOG# Y0349) WITH THE LSOM 2. RESISTOR KIT NOT REQUIRED WHEN USING COMFORTSENSE 7000 CATALOG# Y2081).
Y1-Y2 2-STAGE COMPR
R-O HEAT PUMP
R-DS DEHUM
OR HARMONY
C U
T F
O R
O P
T IO
N
CBX32MV
IMPORTANT USE CARE WHEN CUTTING LINKS TO PREVENT DAMAGE TO CONTROL. SEE FIGURE 20, CBX32MV JUMP AND LINK GUIDE FOR FURTHER DETAILS.
Figure 17. Control (Field Wiring) Heat Pump (Non-Communicating)
CAUTION
ELECTROSTATIC DISCHARGE (ESD)
Precautions and Procedures
Electrostatic discharge can affect electronic components. Take precautions during unit installation and service to protect the unit's electronic controls. Precautions will help to avoid control exposure to electrostatic discharge by putting the unit, the control and the technician at the same electrostatic potential. Neutralize electrostatic charge by touching hand and all tools on an unpainted unit surface before performing any service procedure
Page 17
CBX32MV SERIES
RED
YEL
BLU
BLK
BRN
COMFORTSENSE 7000 THERMOSTAT
OUTDOOR UNIT
PUR
OUTDOOR SENSOR (X2658)
BLK
RED
BLK
PUR
EDA UNIT FAN RELAY
NOTES - /1\ NOT REQUIRED FOR APPLICATIONS WITHOUT LSOM /2\ NOT REQUIRED WITH SINGLESPEED OUTDOOR FAN /3\ NOT REQUIRED FOR SINGLE STAGE
T
T
D
DO NOT CUT ON-BOARD LINK R -O.
CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION TERMINAL IS USED.
CUT ON-BOARD LINK Y1-Y2 FOR TWO- STAGE A/C
4
4 AIR HANDLER CONTROL COMES FROM FACTORY WITH A METAL JUMPERS BETWEEN W1 TO W2 AND W2 TO W3. SEE FIGURE 21 FOR HEAT SECTION CONFIGURATION. .
Y1-Y2 2-STAGE COMPR
R-O HEAT PUMP
R-DS DEHUM
OR HARMONY
C U
T F
O R
O P
T IO
N
CBX32MV
IMPORTANT USE CARE WHEN CUTTING LINKS TO PREVENT DAMAGE TO CONTROL. SEE FIGURE 20, CBX32MV JUMP AND LINK GUIDE FOR FURTHER DETAILS.
CONNECTED ON UNIT WITH LSOM. RESISTOR KIT (CAT # 47W97) IS REQUIRED WHEN CONNECTING THE COMFORTSENSE 7000 (CATALOG# Y0349) WITH THE LSOM 2. RESISTOR KIT NOT REQUIRED WHEN USING COMFORTSENSE 7000 CATALOG# Y2081).
Figure 18. Control (Field Wiring) Cooling Application (Humiditrol and Second-Stage Outdoor Fan Relay Wiring) Non-Communicating
YELLOW
BLUE (NOT REQUIRED FOR SINGLE STAGE)
RED
BLACK
PURPLE PURPLE
BLACK
BLUE
RED
FAN RELAY (NOT REQUIRED WITH SINGLESPEED OUTDOOR FAN)
OUTDOOR SENSOR
(X2658)
COMFORTSENSE 7000 THERMOSTATCBX32MVOUTDOOR UNIT
CUT ON-BOARD LINK R -O.
CUT ON-BOARD LINK Y1-Y2 FOR TWO-STAGE A/C ONLY
CUT ON-BOARD LINK R-DS WHEN DEHUMIDIFICATION TERMINAL IS USED.
T
T
BROWN (NOT USED FOR APPLICATIONS WITHOUT LSOM
Y1-Y2 2-STAGE COMPR
R-O HEAT PUMP
R-DS DEHUM
OR HARMONY
C U
T F
O R
O P
T IO
N
IMPORTANT USE CARE WHEN CUTTING LINKS TO PREVENT DAMAGE TO CONTROL. SEE FIGURE 20, CBX32MV JUMP AND LINK GUIDE FOR FURTHER DETAILS.
Figure 19. Control (Field Wiring) Heat Pump Application (Humiditrol and Second-Stage Outdoor Fan Relay Wiring) Non-Communicating
Page 18
SENSOR CONNECTIONS AND WIRING REQUIREMENTS
The following are sensor connections and wiring requirements for the discharge air and outdoor air sensors.
Discharge Sensor (DAT)
The Air Handler Control has two screw terminals marked Discharge Air Sensor. The sensor is REQUIRED for EVENHEAT operation and is field mounted and ordered separately using Lennox Catalog # 88K38.
In the EVENHEAT mode, the discharge air sensor cycles the electric heating elements as needed to maintain the Air Handler control EVENHEAT jumper selected discharge setpoint.
The discharge air sensor should be mounted downstream of the electric heat elements as illustrated in figure 15, detail A. It must be placed in a location with unobstructed airflow, where other accessories (such as humidifiers, UV lights, etc.) will not interfere with its accuracy.
Wiring distance between the Control and the discharge air sensor should not exceed 10 feet (3 meters) when wired with 18-gauge thermostat wire.
Outdoor Air Sensor This is a two screw terminal for connection to a Lennox X2658 outdoor temperature sensor. The Control takes no action on the sensor status other than to communicate the temperature to the RSBus network. Wiring distance between the AHC and outdoor temperature sensor should not exceed 200 feet when wired with 18-gauge thermostat wire.
Minimum temperature: -40F (-40C)
Maximum temperature: 70F (158C)
AIR HANDLER CONTROL 9-PIN CONNECTOR (P8)
1. Air Handler (no electric heat) Two wire factory harness (wired to pins 7 and 8) which provides 230 VAC power to Air Handler Control.
2. Air Handler (with electric heat) Eight wire factory harness (all pin position are wired as noted in table 5).
NOTE See figure 15, detail B for wire colors.
Table 5. Electric Heat Connection (P8)
Position Function / Description
1 Heat stage 1 relay coil
2 Heat stage 2 relay coil
3 Relay coil return
4 Heat stage 3 relay coil
5 Heat stage 4 relay coil
6 Heat stage 5 relay coil
7 L1 230VAC supply from heater kit
8 L2 230 VAC supply from heater kit
9 Not Used
CONTROL CONNECTIONS AND WIRING REQUIREMENTS
This sections provides information on communicating and non-communicating control connections and wire run lengths.
Table 6. Air Handler Control Connections Communicating
Label Label Function
Thermostat
R 24VAC
i+ RSbus data high connection
i- RSbus data low connection
C 24VAC command (ground)
Outdoor Unit
R 24VAC
i+ RSbus data high connection
i- RSbus data low connection
C 24VAC command (ground)
Link i+
Not used. i-
Table 7. Run Length Communicating
Wire Run Length AWG # Insulation/Core Types
Maximum length of wiring for all connections on the RSbus is limited to 1500 feet (457 meters).
18
Color-coded, temperature rating 95F (35C) minimum, solid core. (Class II Rated Wiring)
Table 8. Run Length Non-Communicating
Wire Run Length AWG # Insulation/Core Types
Less than 100' (30m) 18 Color-coded, temperature rating 95F (35C) minimum, solid core. (Class II Rated Wiring)More than 100' (30m) 16
Page 19
CBX32MV SERIES
Table 9. Air Handler Control Connections
Indoor Control Terminal Label
Function
Non-Communicating Room Thermostat
(Indoor and Outdoor -24 volts)
Indoor Communicating Outdoor Non-Communicating
Full Communication (Indoor & Outdoor)
W1 (Input) Indicates a first-stage heating demand. This input is an anticipator for the ther mostat.
N/A N/A
W2 (Input) Indicates a second-stage heating de mand. W1 input must be active to recog nize second-stage heat demand.
N/A N/A
W3 (Input) Indicates a third-stage heating demand. W1 and W2 inputs must be active to rec ognize third-stage heat demand.
N/A N/A
Y1 & Y2 (Input/ Output)
Room thermostat inputs 24 volts to the Y1 and Y2 terminals on the indoor con trol. The 24 volt signal is then passed through to the outdoor unit. During a sec ond-stage demand, both Y1 and Y2 are active. The Y1 terminal is connected to Y2 by link (Solid jumper on control that would be cut for 2 stage applications)
The room thermostat communicated with the indoor control. The indoor con trol outputs 24 volts on its Y1 and Y2 ter minals which are hard wired to the non- communicating outdoor unit.
In a full communicating system, no wiring is required on Y1 and Y2 terminals.
G (Input) Indicates a 24 volt indoor blower de mand.
In a communicating system, G input to indoor control is used by non-communi cating IAQ devices (such as LVCS, HRV or ERV) to ensure indoor blower de mand.
In communicating system G input to in door control is used by non-communicat ing IAQ devices (such as LVCS, HRV or ERV) to ensure indoor blower demand .
C The C terminal shall interconnect the signal ground of the room thermostat with secondary transformer ground (TR) and chassis ground (GND )
R The R terminal shall be capable of providing the power to the thermostat and all the associated loads .
O (Input/Output)
Room thermostat inputs 24 volts to the O terminal on the indoor control. The O terminal is connected to R by link (Solid jumper on control that would be cut if unit was a heat pump)
The room thermostat communicated with the indoor control. The indoor con trol outputs 24 volts on its O terminals which are hard wired to the non-commu nicating outdoor unit. If there is 24 volts on O, the reversing valve will be ener gized and the outdoor unit will run in the cooling mode. If O does not have 24 volts, the outdoor unit will run in heating mode.
In a full communicating system, O termi nal is not wired.
DS (Input)
Used for Harmony III zoning systems, or thermostat with dehumidification capa bility. The DS terminal is connected to R by link (Solid jumper on control that would be cut if for the above applica tions). Harmony III control - This will allow the control to vary the voltage signal to the in door blower motor to control required CFM. Dehumidification - Allow a 24 volt sig nal on the DS to turn off and on the dehu midification mode.
N/A N/A
DH (Output) The DH terminal provides a 24VAC output for dehumidification needs in communicating systems . H (Output) The H terminal provides a 24VAC output for humidification needs in both communicating and non-communicating mode .
L (Input) The L terminal is provided for connection to devices with Lennox System Operation Monitor (LSOM) capabilities. The control interprets the fault signals and transmits them as an alarm message on the communication line. There are ten (10) identified LSOM fault codes. Each is mapped to the communication Alarm codes.
Page 20
OUTDOOR AIR SENSOR
HEAT
1 2 3 4
COOL
1 2 3 4
DELAY
1 2 3 4
ADJUST
NORM + -
HUMIDIFICATION
SMARTAUTO
EVENHEAT
1 2 3 4
BLOWER ONLY CFM
1 0
0
1 1
5
1 3
0
8 5
Y 1
-Y 2
2 -S
T A
G E
C O
M P
R
R -O
H E
A T
P U
M P
R -D
S D
E H
U M
O R
C
W1
W2
G
Y2
Y1
C
R
DH
H
L
O
DS
W3
FACTORY JUMPER
FUSE 3 AMP
XFMR24V
24 VAC
COM
3
6
9
1
4
7
XFMR LINE
G
7-SEGMENT LED
D E
H U
M ID
IF IC
A T
IO N
-
H A
R M
O N
Y L
IN K
(J U
M P
E R
S R
t o D
S )
H E
A T
P U
M P
L IN
K
(J U
M P
E R
S R
t o O
)
2 -S
T A
G E
C O
M P
R E
S S
O R
L IN
K
(J U
M P
E R
S Y
1 t o Y
2 )
O N
-B O
A R
D L
IN K
O P
T IO
N S
E L
E C
T IO
N
1
JUMPER & LINK GUIDE
-CUT ON-BOARD LINK (SOLDER TRACE) COMPLETELY
THROUGH BOTH LAYERS ON THE CONTROL BOARD 1
COOLING BLOWER RAMPING
DELAYPROFILE #3
OFF-82%-100%-OFF
CLG
HP
DELAY PROFILE #2
DELAYPROFILE #1
OFF-100%-OFF
DELAYPROFILE #4
OFF-50%-82%- 100%-50%-OFF
*
(COOLING MODE UNLESS NOTED)
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
*
HUMIDIFICATION MODE
SMART MODE
- H ENABLED WHEN
HEAT ACTIVE
(HP or ELECT. HT)
AUTO MODE
- H ENABLED WHEN
BLOWER ACTIVE
& NO CLG
OR DEHUM
HUMIDIFICATION MODE
24VAC OUTPUT ON H FOR HUMIDIFIER OR
ACCESSORY INTERLOCK
SMART AUTO
SMART AUTO
COOLING MODE
BLOWER SPEED
HIGH
SPEED
MEDIUM-LOW
SPEED
LOW SPEED
1 2 3 4
MEDIUM-HIGH
SPEED
*
1 2 3 4
1 2 3 4
1 2 3 4
(COOLING & HP MODE)
STANDARD
HEAT MODE
(STAGED BY TSTAT)
STANDARD HEAT MODE
(DEFAULT)
8 5
1 1
0 1
1 5
1 3
0
HEATING MODE
BLOWER SPEED
*
(ELECTRIC HT MODE)
1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
LOW SPEED
MEDIUM-LOW
SPEED
MEDIUM-HIGH
SPEED
HIGH
SPEED
NORM + -
NORM+ -
NORM+ -
BLOWER
ADJUST SELECTION
NORMAL
(+ 10%)
SETTING
(-10%)
SETTING
*
*
EVENHEATER MODE
85
DEGREE TARGET
DISCHARGE
TEMPERATURE
100
DEGREE
TARGET
115 DEGREE
TARGET
130 DEGREE
TARGET
8 5
1 1
0 1
1 5
1 3
0
-ENABLED WITH OPTIONAL
DISCHARGE AIR SENSOR
8 5
1 1 0
1 1 5
1 3 0
8 5
1 1 0
1 1 5
1 3 0
8 5
1 1 0
1 1 5
1 3 0
PUSH
BUTTON
HIGH SPEED
(100%)
MEDIUM-HIGH SPEED (70%)
LOW
SPEED
(28%)
* MEDIUM-LOW SPEED
(38%) 1 2 3 4
1 2 3 4
1 2 3 4
1 2 3 4
CONTINUOUS FAN
BLOWER SPEED
IMPORTANT: USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL.
2
5
8
P8
L1L2
L2 L1 INDOOR BLOWER POWER
EARTH
INDOOR BLOWER SIGNAL
4 5 6
1 2 3
OUTDOOR UNIT LINK
I + I - I + I -R C
I + I -R C
THERMOSTAT
HUMIDITROL
DH
DISCHARGE AIR SENSOR
H A
R M
O N
Y
R -D
S
D E
H U
M o r
NO HARMONY ZONING
OR NO
COMFORTSENSE 7000
W/ DS CONNECTION
DO NOT CUT
HARMONY ZONING
OR
C0MFORTSENSE 7000
W/ DS CONNECTION
CUT LINK
H A
R M
O N
Y
R -D
S
D E
H U
M o r
H A
R M
O N
Y
1
A/C UNIT HEAT PUMP UNIT
R -0
H E
A T
P U
M P
R -0
H E
A T
P U
M P
1
DO NOT CUT CUT LINK
2 S
T A
G E
C O
M P
R
1-STG COMPRESSOR 2-STG COMPRESSOR
Y 1 -Y
2
1DO NOT CUT CUT LINK
*
*
*
2 S
T A
G E
C O
M P
R
Y 1 -Y
2
OFF 100% DEMAND SATISFIED 100% FOR 45 SECONDS OFF
OFF 30 SECOND DELAY 100% DEMAND SATISFIED 100% FOR 45 SECOND OFF
* INDICATES FACTORY DEFAULT SETTING
Figure 20. Air Handler Configuration
Page 21
CBX32MV SERIES
Air Handler Control Button, Display and Jumpers
Use figure 20 as reference for jumper settings. If any of the referenced jumpers are missing, the Air Handler Control will display Error Code 130 as per table 10, and the Air Handler Control will automatically use the factory default setting show in figure 20)
IMPORTANT Before changing any clippable links or jumper settings, make sure the motor has completely stopped. Any changes will not take place while the motor is running.
PUSH BUTTON
An on-board push button is provided for the purpose of placing the Air Handler Control in different operation modes and can be used to recall stored error codes. When button is pushed and held, Air Handler Control will cycle through a menu of options depending on current operating mode. Every three seconds a new menu item will be displayed. If the button is released while that item is shown on the display, Air Handler Control will enter displayed operating mode, or execute defined operation sequence for that menu option. Once all items on menu have been displayed the menu resumes from the beginning (if button is still held).
1. Press the diagnostic push button and hold it to cycle through a menu of options. Every five seconds a new menu item will be displayed. Release the button when the desired mode is displayed.
2. When the solid E is displayed, the control enters the Error
Code Recall mode. Error Code Recall mode menu options:
No change (displaying error history) remains in Error Code
Recall mode; solid exits Error Code Recall mode; and
solid c clears the error history. Must press button while
flashing c is displayed to clear error codes
3. When the solid - is displayed, the control enters the
applicable mode. Field configuration mode menu options:
Solid C starts pressure switch calibration; blinking - exits
current active mode.
JUMPERS
Jumpers are used for non-communicating mode only.
1. Humidification Controls the status of H terminal on the thermostat block. Configurations are as follows:
If jumper is installed in SMART Humidification position (Default), H terminal is active if heat demand is present and indoor blower is running.
If jumper is installed in AUTO Humidification position, H terminal is energized whenever indoor blower is running.
2. EvenHeat Target Discharge Air Temperature selection is used to set discharge air temperatures for EvenHeat operation.
NOTE - Optional Discharge Air Temperature Sensor,
Lennox Catalog # 88K38 is REQUIRED for EVENHEAT
operation and must be ordered separately.
3. Blower Only CFM Used to select Indoor blower CFM for continuous operation.
4. Heat Used to select Indoor blower CFM for electrical heat by placing the jumper in proper position. Actual CFM values for different air handler sizes are shown in Targeted CFM tables starting on page 26.
5. Cool Used to select cooling indoor blower CFM by placing the jumper in proper position. Actual CFM values for different air handler sizes are shown in Targeted CFM tables starting on page 26.
6. Adjust - Used to select the indoor blower CFM adjustment value by placing the jumper in appropriate position.
If NORM is selected, indoor blower runs at normal speeds.
If + is selected, indoor blower runs at approximately 10% higher speed than NORM setting.
If - is selected, indoor blower runs at approximately 10% lower speed than NORM setting.
If the jumper is missing, the Air Handler Control will activate the Configuration Jumper is Missing alarm in and will automatically use the default factory setting in table 10. See figure 20 for jumper configurations. Actual CFM values for different air handler sizes are shown in Targeted CFM tables starting on page 26.
7. Delay Indoor blower cooling profile, delay for cooling and heat pump operations.
For heat pump heating operation only delay profiles 1 and 2 are applicable. If profiles 3 or 4 have been selected, heat pump operation will use profile 1 only.
For heat pump cooling operation all 4 profiles are operational.
If the jumper is missing, the Air Handler Control will
activate the Configuration Jumper is Missing alarm
and will automatically use the default factory setting in
table 10. See figure 20 for jumper configurations.
Delay Profile 1
A When cool or heat demand is initiated, motor ramps up to 100% and runs at 100% until demand is satisfied.
B Once demand is met, motor ramps down to stop.
A
B
OFFOFF
100% CFM
COOLING DEMAND
Delay Profile 2
Cooling Air Conditioner and Heat Pump:
A
B C
OFFOFF 100% CFM 100% CFM
COOLING
DEMAND 45 SEC.
A When cool demand is initiated, motor ramps up to 100% and runs at 100% until demand is satisfied.
Page 22
B Once demand is met, motor runs at 100% for 45 seconds.
C Motor ramps down to stop.
Heating Heat Pump only:
OFFOFF 100% CFM 100% CFM
HEATING DEMAND
45 SEC.30 sec delay
A B
C D
A When heat demand is initiated, 30 seconds motor on delay starts
B After the motor on delays expires, motor ramps up to 100% and runs at 100% until demand is satisfied.
C Once demand is met, motor runs at 100% for 45 seconds.
D Motor ramps down to stop.
Delay Profile 3
OFFOFF 82%CFM 100% CFM
COOLING DEMAND
7 1/2 MIN A
B C
A When cool demand is initiated, motor ramps up to 82%
B Motor runs at 82% for approximately 7.5 minutes and then ramp up to 100% (unless the demand has been satisfied) and motor runs at 100% until demand is satisfied.
C Once demand is met, motor ramps down to stop
Delay Profile 4
OFFOFF
1/2 MIN 50% CFM
COOLING DEMAND
7 1/2 MIN 82% CFM
100%
CFM 1/2 MIN 50% CFM
B
A
C D E
A When cool demand is initiated, motor ramps up to 50%
B Motor runs at 50% for 30 seconds and ramps up to 82%
C Motor runs at 82% for approximately 7.5 minutes and then ramp up to 100% (unless the demand has been satisfied) and motor runs at 100% until demand is satisfied.
D Once demand is met, motor runs at 50% for 30 seconds.
E Motor ramps down to stop.
DISPLAY
An on-board single character LED display (see figure 20 for LED display location) indicates general system status information such as mode of operation, indoor blower CFM and error codes. Multi-character strings are displayed with character ON for one second, OFF for 0.5 seconds and one second pause between the character groups.
Table 10. AHC System Status Codes
AHC Single Character Display
Action
Letter or Number Unit Size Code displayed represents air handler model size and capacity. See Configuring Unit Size Codes in figure 22.
If three horizontal bars are displayed, AHC does not recognize air handler model size and capacity. See Configuring Unit Size Codes in Figure 22.
. Idle mode (decimal point / no unit operation)
Cubic feet per minute (cfm) setting for indoor blower (1 second ON, 0.5 second OFF) / cfm setting for current mode displayed. Example:
Cooling stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause / cfm setting displayed / Pause / Repeat codes). Example or
Dehumidification mode (1 second ON) / 1 second OFF) / cfm setting displayed / Pause / Repeat Codes)
Defrost mode. (Y, W and O call)
Heat Stage (1 second ON, 0.5 second OFF) / 1 or 2 displayed / Pause / cfm setting displayed / Pause / Repeat codes.
Example: or or
Variable Capacity Heat (1 second ON, 0.5 second OFF) / % of input rate displayed / Pause/ cfm setting / Pause/ Re peat codes. Example: or
Discharge air sensor temperature (indoor blower must be operating)
Page 23
CBX32MV SERIES
Table 11. AHC Configuration, Test and Error Recall (Fault and Lockout) Function
NOTE AHC MUST BE IN IDLE MODE)
Single Character LED Display
Action
Solid Push and hold button until solid appears, release button. Display will blink.
Blinking Push and hold button until required symbol displays. or
CONFIGURING ELECTRIC HEAT SECTIONS
Solid Release push button - control will cycle the indoor blower motor on to the selected heat speed and stage the electric heat relays on and off to automatically detect number of electric heat sections. Control will store the number of electric heat sections. Control will automatically exit current active mode.
INDOOR BLOWER TEST
Solid Release push button - control cycles indoor blower on for ten seconds at 70% of maximum air for selected capacity size unit. Control will automatically exit current active mode.
CONFIGURING UNIT SIZE CODES
Single Character LED Display
Action
Solid
RELEASE push button - This mode allows the field to select a unit size code (number or letter) that matches the air handler model size and capacity.
IMPORTANT All field replacement controls may be manually configured to confirm air handler model size and capacity.
Blinking
1. When the correct Unit Sized Code is displayed, RELEASE push button. Selected code will flash for 10 second period.
2. During ten second period, HOLD push button until code stops blinking (three seconds minimum).
3. Air Handler Control will store code in memory and exit current active mode. LED display will go blank and then the Unit Size Code will display for 2 to 5 seconds.
NOTE - If ten second period expires, or push button is held less than 3 seconds, control will automatically exit current
active mode and go into IDLE Mode without storing unit size code. If this occurs, then Unit Size Code configuring
procedure must be repeated.
ERROR CODE RECALL MODE (NOTE CONTROL MUST BE IN IDLE MODE)
Solid To enter Error Code Recall Mode PUSH and HOLD button until solid E appears, then RELEASE button.
Control will display up to ten error codes stored in memory. If E000 is displayed, there are no stored error codes.
Solid
To exit Error Code Recall Mode PUSH and HOLD button until solid three horizontal bars appear, then RELEASE button.
NOTE - Error codes are not cleared
Solid To clear error codes stored in memory, continue to HOLD push button while the three horizontal bars are displayed. Release push button when solid c is displayed.
Blinking Push and hold for one (1) second, release button. Seven-segment will display 0000 and exit error recall mode.
Page 24
Table 12. AHC Single Character Display Alert Codes (Communicating and Non-Communicating)
Alert
Code Priority Alert How to Clear
Critical The air-handler has lost communication with the rest of the system.
Equipment is unable to communicate. This may indicate the existence of other alarms / codes. In most cases errors are related to electrical noise. Make sure high voltage power is separated from RSBus. Check for mis-wired and/or loose connections be tween the thermostat, indoor unit and outdoor unit. Check for a high voltage source of noise close to the system. Generally, this is a self-recoverable error.
Critical There is a frequency/distortion problem with the power to the air-handler.
This alarm/code may indicate transformer overloading. Check the voltage and line power frequency. Check the generator operating frequency, if the system is running on back-up power. Correct voltage and frequency problems. System resumes normal op eration 5 seconds after fault recovered.
Critical The 24VAC to the air-handler control is lower than the required range of 18 to 30VAC.
24-volt power low (range is 18 to 30 volts). Check and correct voltage. Check for addi tional power-robbing equipment connected to system. This alarm / code may require the installation of an additional or larger VA transformer.
Moderate There is a delay in the air-handler re sponding to the system.
Typically, this alarm/code does not cause any issues and will clear on its own. The alarm/code is usually caused by a delay in the outdoor unit responding to the thermo stat. Check all wiring connections. Cleared after unresponsive device responds to any inquiry.
Critical The icomfort thermostat has lost com munication with the air-handler for more than 3 minutes.
Equipment lost communication with the icomfort thermostat. Check the wiring con nections, ohm wires and cycle power. The alarm stops all associated HVAC operations and waits for a heartbeat message from the unit that's not communicating. The alarm/ fault clears after communication is re-established.
Critical There is a hardware problem with the air-handler control.
There is a control hardware problem. Replace the control if the problem prevents op eration and is persistent. The alarm / fault is cleared 300 seconds after the fault recov ers.
Moderate An air-handler configuration jumper is missing.
Configuration jumper(s) missing on control (applicable in non-communicating applica tions only). Replace the jumper or put wire between terminals on control. Cleared after jumper is connected.
Critical The air-handler control parameters are corrupted.
Reconfigure the system. Replace the control if heating or cooling is not available.
Critical The air-handler control software is cor rupted.
Recycle power. If failure re-occurs, replace the control. System reset is required to re cover.
Critical The icomfort thermostat has found a problem with the air-handler outdoor sensor.
In normal operation after control recognizes sensors, the alarm will be sent if valid tem perature reading is lost. Compare outdoor sensor resistance to temperature/resist ance charts in unit installation instructions. Replace sensor pack if necessary. At the beginning of (any) configuration, the air-handler control will detect the presence of the sensor(s). If detected (reading in range), appropriate feature will be set as installed and shown in the About screen. The alarm / fault will clear upon configuration, or sensing normal values.
Critical The system has lost communication with the air-handler indoor blower motor.
Lost communication with indoor blower motor. Possible causes include power outage, brown-out, motor not powered, loose wiring, condensation on air handler control with out cover on breaker. Problem may be on control or motor side. Cleared after commu nication is restored.
Critical The unit size code for the air-handler and the size of blower motor do not match.
Incorrect appliance unit size code selected. Check for proper configuring under unit size codes for air handler on configuration guide or in installation instructions. The alarm / fault clears after the correct match is detected following a reset. Remove the thermostat from the system while applying power and reprogramming.
Critical The unit size code for the air-handler has not been selected.
No appliance unit size code selected. Check for proper configuring under: Unit size codes for air handler on configuration guide or in installation instructions. Critical Alert. The alarm /fault clears after the correct match is detected following a reset. Remove the thermostat from the system while applying power and reprogramming.
Critical The air-handler's blower motor will not start.
The system will go into watchguard mode. Indoor blower motor unable to start. This could be due to seized bearing, stuck wheel, obstruction etc. Replace motor or wheel if assembly does not operate or meet performance standards. The alarm / fault clears after the indoor blower motor starts successfully.
Minor The indoor blower motor is over heating. Indoor blower motor over temperature (motor tripped on internal protector). Check mo tor bearings and amps. Replace if necessary. The alarm / fault clears after blower de mand is satisfied.
Critical There is a problem with air-handler dis charge air sensor.
Compare outdoor sensor resistance to temperature/resistance charts in installation instructions. Replace sensor if necessary. The alarm/fault is cleared 30 seconds after fault is detected as recovered.
Minor The blower cannot provide the re quested CFM due to high static.
Warning Only. Restricted airflow - Indoor blower is running at a reduced CFM (cutback mode). The variable-speed motor has pre-set speed and torque limiters to protect the motor from damage caused by operating outside of design parameters (0 to 0.8 e.g.. total external static pressure). Check filter and duct system. To clear, replace filter if needed or repair/add duct. The alarm/fault is cleared after the current service demand is satisfied.
Minor The indoor and outdoor unit capacities do not match.
Check for proper configuring in installation instructions. Alarm is just a warning. The system will operate, but might not meet efficiency and capacity parameters. The alarm will clear after commissioning is complete.
Page 25
CBX32MV SERIES
Table 12. AHC Single Character Display Alert Codes (Communicating and Non-Communicating) (continued)
Alert
Code Priority Alert How to Clear
Critical The O relay on the air-handler has failed. Either the pilot relay contacts did not close or the relay coil did not energize.
O relay failed. Pilot relay contacts did not close or the relay coil did not energize. Re place control. The alarm clears after a reset
Critical The R to O jumper was not removed on the air-handler control.
Configuration link(s) not removed on control. Cut / remove R to O jumper. Applicable with non communicating outdoor unit with communicating indoor unit. The fault clears after the R to O jumper is cut/removed.
Critical
The Y1 relay on the air-handler has failed. Either the pilot relay contacts did not close or the relay coil did not ener gize.
Operation stopped. Y1 relay failed. Pilot relay contacts did not close or the relay coil did not energize. The indoor unit cannot verify that the relay is closed. The alarm clears after a reset and Y1 input sensed.
Critical The Y2 relay on the air-handler has fai led. Either the pilot relay contacts did not close or the relay coil did not energize.
Operation stopped. Y2 relay failed. Pilot relay contacts did not close or the relay coil did not energize. The indoor unit cannot verify that the relay is closed. The alarm clears after a reset and Y2 input sensed.
Critical The air-handler's electric heat is not configured.
Heat call with no configured or mis-configured electric heat. Configure electric heat in the air-handler. The fault clears electrical heat is successfully detected.
Critical
There is a problem with the air-handler's first stage electric heat. Either the pilot relay contacts did not close, or the relay coil in the electric heat section did not energize.
Heat section / stage 1 failed. Pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The alarm clears after stage 1 relay is detected.
Moderate1
There is a problem with the air-handler's second stage electric heat. Either the pi lot relay contacts did not close, or the relay coil in the electric heat section did not energize. The air-handler will oper ate on first stage electric heat until the is sue is resolved.
Heat section / stage 2 failed (same as code 351). Pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The air-handler will operate on stage 1 heat only. The alarm clears after stage 2 relay is detected.
Moderate1
There is a problem with the air-handler's third stage electric heat. Either the pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The air-handler will operate on first stage electric heat until the issue is resolved.
Heat section / stage 3 failed (same as code 351). Pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The air-handler will operate on stage 1 heat only. The alarm clears after sage 2 relay is detected.
Moderate1
There is a problem with the air-handler's fourth stage electric heat. Either the pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The air-handler will operate on first stage electric heat until the issue is resolved.
Heat section / stage 4 failed (same as code 351). Pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The air-handler will operate on stage 1 heat only. The alarm clears after stage 2 relay is detected.
Moderate1
There is a problem with the air-handler's fifth stage electric heat. Either the pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The air-handler will operate on first stage electric heat until the issue is resolved.
Heat section / stage 5 failed (same as code 351). Pilot relay contacts did not close, or the relay coil in the electric heat section did not energize. The air-handler will operate on stage 1 heat only. The alarm clears after stage 2 relay is detected.
Moderate
The secondary voltage for the air-hand ler has fallen below 18VAC. If this con tinues for 10 minutes, the icomfort thermostat will turn off the air-handler.
Secondary voltage is below 18VAC. After 10 minutes, operation is discontinued. Check the indoor line voltage, transformer output voltage. The alarm clears after the voltage is higher than 20VAC for 2 seconds or after a power reset.
Page 26
Target CFM Tables
CBX32MV018/024 BLOWER PERFORMANCE
0 through 0.80 in. w.g. External Static Pressure Range
AJUST
Jumper Setting
Jumper Speed Positions
HEAT Speed COOL Speed
1
cfm
2
cfm
3
cfm
4
cfm
1
cfm
2
cfm
3
cfm
4
cfm
+ 715 855 1000 1130 465 690 900 1050
NORM 670 770 900 1035 425 620 825 950
- 580 700 800 930 385 560 735 850
NOTES:
The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
First stage cooling air volume is 70% of COOL speed settings. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper
selectable) of the same secondstage COOL speed selected, minimum 250 cfm.
Lennox Harmony III Zone Control applications - minimum blower speed if 250 cfm.
CBX32MV024/030 BLOWER PERFORMANCE
0 through 0.80 in. w.g. External Static Pressure Range
AJUST
Jumper Setting
Jumper Speed Positions
HEAT Speed COOL Speed
1
cfm
2
cfm
3
cfm
4
cfm
1
cfm
2
cfm
3
cfm
4
cfm
+ 800 935 1070 1210 660 880 1100 1320
NORM 725 850 975 1100 600 800 1000 1200
- 655 765 880 990 540 720 900 1080
NOTES:
The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
First stage cooling air volume is 70% of COOL speed settings. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper
selectable) of the same secondstage COOL speed selected, minimum 250 cfm.
Lennox Harmony III Zone Control applications - minimum blower speed if 250 cfm.
CBX32MV036 BLOWER PERFORMANCE
0 through 0.80 in. w.g. External Static Pressure Range
AJUST
Jumper Setting
Jumper Speed Positions
HEAT Speed COOL Speed
1
cfm
2
cfm
3
cfm
4
cfm
1
cfm
2
cfm
3
cfm
4
cfm
+ 1230 1335 1445 1545 900 1225 1380 1545
NORM 1120 1215 1315 1400 810 1125 1275 1400
- 1010 1185 1200 1265 730 1000 1135 1265
NOTES:
The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
First stage cooling air volume is 70% of COOL speed settings. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper
selectable) of the same secondstage COOL speed selected, minimum 250 cfm.
Lennox Harmony III Zone Control applications - minimum blower speed if 250 cfm.
Page 27
CBX32MV SERIES
CBX32MV048 and CBX32MV060 BLOWER PERFORMANCE
0 through 0.80 in. w.g. External Static Pressure Range
AJUST
Jumper Setting
Jumper Speed Positions
HEAT Speed COOL Speed
1 2 3 4 1 2 3 4
cfm cfm cfm cfm cfm cfm cfm cfm
+ 1850 1960 2090 2150 1625 1820 2055 2145
NORM 1705 1800 1900 2005 1425 1625 1805 2005
- 1560 1625 1720 1770 1205 1375 1555 1725
NOTES:
The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
First stage cooling air volume is 70% of COOL speed settings. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper
selectable) of the same secondstage COOL speed selected, minimum 450 cfm.
Lennox Harmony III Zone Control applications - minimum blower speed if 450 cfm.
CBX32MV068 BLOWER PERFORMANCE
0 through 0.80 in. w.g. External Static Pressure Range
AJUST
Jumper Setting
Jumper Speed Positions
HEAT Speed COOL Speed
1
cfm
2
cfm
3
cfm
4
cfm
1
cfm
2
cfm
3
cfm
4
cfm
+ 1875 1975 2090 2150 1640 1840 2075 2150
NORM 1760 1825 1920 2030 1465 1625 1800 2000
- 1550 1650 1725 1800 1250 1390 1560 1720
NOTES:
The effect of static pressure, filter and electric heater resistance is included in the air volumes listed.
First stage cooling air volume is 70% of COOL speed settings. Continuous fan speed is approximately 28%, 38%, 70% and 100% (Jumper
selectable) of the same secondstage COOL speed selected, minimum 450 cfm.
Lennox Harmony III Zone Control applications - minimum blower speed if 450 cfm.
Page 28
Unit Operating Sequences
This section details unit operating sequence for non-communicating systems.
NOTE - For communicating systems, see the icomfort thermostat installation instruction.
Table 13. CBX32MV with ComfortSense 7000 Thermostat and Single-Stage Outdoor Unit Operating Sequence
Operating Sequence System Demand System Response
System Condition
Step
Thermostat Demand Relative Humidity
Comp
Air Handler
CFM (COOL)
Comments
Y1 Y2 O G W1 W2 Status D
NO CALL FOR DEHUMIDIFICATION
Normal Operation 1 On On On Acceptable 24 VAC High 100% Compressor and indoor air handler follow thermostat demand
BASIC MODE (Only active on a Y1 thermostat demand)
Normal Operation 1 On On On Acceptable 24 VAC High 100% ComfortSense 7000 thermostat energizes Y1 and de-energizes D on a call for dehumidification.
NOTE - No over cooling.
Dehumidification Call
2 On On On Demand 0 VAC High 70%
PRECISION MODE (Operates independent of a Y1 thermostat demand)
Normal Operation 1 On On On Acceptable 24 VAC High 100% Dehumidification mode begins when humidity is greater than set point
Dehumidification call
2 On On On Demand 0 VAC High 70%
Dehumidification call ONLY
1 On On On Demand 0 VAC High 70%
ComfortSense 7000 will keep outdoor unit energized after cooling temperature setpoint has been reach in order to maintain room humidity setpoint.
NOTE - Allow to over cool 20F from cooling set point.
Page 29
CBX32MV SERIES
Table 14. CBX32MV with ComfortSense 7000 Thermostat and TwoStage Outdoor Unit Operating Sequence
Operating Sequence System Demand System Response
System Condition Step
Thermostat Demand Relative Humidity
Compre ssor
Air Handler
CFM (COOL) CommentsY1 Y2 O G W1 W2 Status D
No Call for Dehumidification
Normal Operation - Y1
1 On On On Acceptable 24 VAC Low 70% Compressor and indoor air handler follow thermostat demandNormal Operation
- Y2 2 On On On On Acceptable 24 VAC High 100%
Room Thermostat Calls for First-Stage Cooling
BASIC MODE (Only active on a Y1 thermostat demand)
Normal Operation 1 On On On Acceptable 24 VAC Low 70% ComfortSense 7000 ther mostat energizes Y2 and de- energizes D on a call for dehumidification
NOTE - No over cooling.
Dehumidification Call
2 On On On On Demand 0 VAC High 70%
PRECISION MODE (Operates independent of a Y1 thermostat demand)
Normal Operation 1 On On On Acceptable 24 VAC Low 70% Dehumidification mode begins when humidity is greater than set point
Dehumidification call
2 On On On On Demand 0 VAC High 70%
Dehumidification call ONLY
1 On On On On Demand 0 VAC High 70%
ComfortSense 7000 thermostat will keep outdoor unit energized after cooling temperature setpoint has been reached in order to maintain room humidity setpoint.
NOTE Allow to over cool 20F from cooling set point.
Room Thermostat Calls for First- and Second-Stage Cooling
BASIC MODE (Only active on a Y1 thermostat demand)
Normal Operation 1 On On On On Acceptable 24 VAC High 100% ComfortSense 7000 ther mostat energizes Y2 and de- energizes D on a call for dehumidification
NOTE No over cooling.
Dehumidification Call
2 On On On On Demand 0 VAC High 70%
PRECISION MODE (Operates independent of a Y1 thermostat demand)
Normal Operation 1 On On On On Acceptable 24 VAC High 100% Dehumidification mode begins when humidity is greater than set point
Dehumidification call
2 On On On On Demand 0 VAC High 70%
Dehumidification call ONLY
1 On On On On Demand 0 VAC High 70%
ComfortSense 7000 thermostat will keep outdoor unit energized after cooling temperature setpoint has been reached in order to maintain room humidity setpoint.
NOTE Allow to over cool 20F from cooling set point.
Page 30
Configuring Unit
This section identifies the requirements for configuring the air handler unit for unit size, heat mode selection and EvenHeat.
Air Handler Control Checkout
Power-up - Unit Size Code (Number or letter) displayed represents air handler model size and capacity. If three horizontal bars displays, Air Handler Control (AHC) does not recognize unit size code (air handler model size and capacity).
AHC recognizes Unit Size Code?
Electric heat
Installed?
Finished
Which Heat Mode?
Refer to EVENHEAT Operation flow diagram, Air Handler or ECB40 Electric Heat installation instructions.
W1 Call?
YesNo
Yes
No (Display Alarm Code 203)
Standard EVENHEAT
Refer to Heat Pump or Cooling Sequence of Operation flow diagrams, Air Handler or ECB40 Electric Heat installation instructions.
A call for electric heating first, second or third stage is initiated when 24 VAC (R) is detected on W1, W2 and W3 inputs on AHC. (Factory mounted metal jumpers connect W1/2 and W2/W3.)
At the completion of each heat section demand (W1, W2, and W3), the AHC will immediately de-energize the corresponding pilot relay(s).
At the completion of all heating demands, the indoor blower will run for an additional 10 seconds before de-energizing.
No
Yes
NOTE If the call for lower heat section is removed, AHC will automatically de-energize higher heat sections.
Indoor blower will immediately start to delivery CFM as set by heating mode jumper on AHC with activation of first electric heat pilot relay.
Pilot relays on AHC are energized one at a time. There is a minimum of 10 seconds delay between pilot relay activations.
After all electric heat installations, AHC must be manually configured to detect number of heat sections. Refer to Configuring/Detecting electric heat sections flow diagram, Air Handler or ECB40 Electric Heat installation
IMPORTANT Field replacement controls may need to be manually configured to validate air handler unit size code.
Refer to Configuring Unit Size Codes flow diagram, Air Handler or ECB40 Electric Heat installation instructions.
ONE (H1)
H1
TWO (H1-H2)
H1
H2
H2
THREE (H1-H3)
H1
H2
H3
FOUR (H1-H4)
H1 AND H2
H3
H4
FIVE (H1-H5)
H1 AND H2
H3 AND H4
H5
T-STAT CALL
W1
W2
W3
NUMBER OF HEAT SECTIONS DETECTED
NOTE - AHC will not recognize higher heat sections calls if lower heat section is not present.
RECOMMEND USE FIGURE 20 AS A REFERENCE FOR SETTING JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.
Figure 21. Air Handler Control Checkout
Page 31
CBX32MV SERIES
Configuring Unit Size Codes (Model Number)
Power-up Unit Size Code (number or letter) displayed represents unit size code (air handler model size and capacity). If three horizontal bars display, then Air Handler Control (AHC) does not recognize unit size code.
AHC in IDLE mode (No heating, cooling or indoor fan operation)
To enter unit size code configuration mode; PUSH and
HOLD button next to single character LED display until dash
symbol appears, RELEASE button.
Turn room thermostat to OFF
PUSH and HOLD button until the solid P symbol is displayed on the single
character LED display, then RELEASE button. This mode allows the user to
select a unit size code (number or letter) that matches the air handler model size
and capacity.
Solid dash starts blinking on single character LED
display.
Solid P starts blinking on single
character LED display.
PUSH and HOLD button to allow AHC to display unit size code (letter or number) for each different air handler model for three seconds.
Yes No
IMPORTANT Field replacement controls may need to be manually configured to validate air handler unit size code.
AIR HANDLER MODEL
CBX32MV-018/024
CBX32MV-024/030
CBX32MV-036
CBX32MV-048
CBX32MV-060
CBX32MV-068
CBX40UHV-024
CBX40UHV-030
CBX40UHV-036
CBX40UHV-042
CBX40UHV-048
CBX40UHV-060
UNIT SIZE CODE
0
1
2
3
4
5
6
7
8
9
L
U
1. When the correct Unit Sized Code is displayed, RELEASE
push button. Selected code will flash for 10 second period.
2. During that 10 second period, HOLD push button until code
stops blinking (three seconds minimum).
3. Air Handler Control will store code in memory and exit current
active mode. LED display will go blank and then the Unit Size
Code will display for 2 to 5 seconds.
NOTE - If 10 second period expires, or push button is held less than
three seconds, control will automatically exit current active mode
and go into IDLE Mode without storing unit size code. If this occurs,
then Unit Size Code configuring procedure must be repeated.
LED displays correct Unit Size Code.
Unit enters IDLE Mode.
YESNO
Figure 22. Configure Unit Size Codes
Page 32
Configuring/Detecting Electric Heat Sections
IMPORTANT All electric heat installations require the Air Handler Control (AHC) to be manually configured to detect number of heat sections.
Which Heat Mode?
Set desired Heating Mode Blower Speed jumper pin.
Configuration
Standard EVENHEAT
AHC in Idle Mode (No heating cooling or indoor fan operation)
To enter electric heat mode configuration, push and hold button next to single character LED display until dash symbol (solid bar) appears, then release button.
Turn room thermostat to OFF.
Yes
Solid dash starts blinking on single character LED display
Push and hold button until the solid H symbol is displayed on the single character LED display, then release button.
Finished
No
NOTE All field replacement AHC will require configuring/detecting electric heat sections.
Electric heat is stages by room thermostat. (AHC comes with factory jumper between W1 to W2 and W2 to W3)
Refer to Air Handler Control Checkout flow diagram for operation.
Set desired Heating Mode Blower Speed jumper pin.
Install and wire discharge air temperature sensor.
Set desired Target Discharge Temperature jumper pin. If jumper pin is missing or discharge air temperature sensor is not detected, AHC defaults to Standard Heat Mode. Target settings are 85, 100, 115 and 130F) .
Refer to EVENHEAT Operation flow diagram for operation.
1. AHC will start the indoor blower motor to the selected heat jumper speed setting and cycle the electric heat relays ON to automatically detect number of electric heat sections. (Electric heat section may be wired to energize more than one element)
2. AHC waits for maximum of ten seconds to detect electric heat 22 volt DC relay coils are energizing:
A If relay coil current is detected within ten seconds, AHC will show a 1 on the single character LED display indicating that the first stage has been detected. As each additional heat section is detected, single character LED display on the AHC will display that electric element number. (Example: Last number displayed by the single character LED display is 3, the AHC is configured to operate three electric heat sections.)
B If relay coil current is not detected within ten seconds, the AHC will exit the current active mode and resume operation with electric heat disabled.
3. AHC will automatically exit current configuration mode when configuration is completed. To verify that the number of electric sections detected matches the installed electric heat package, the field MUST CONFIRM that the last number the single character LED display before exiting the Configuring/Detection Mode matches the number of installed electric heat sections. AHC stores the number of electric heat stages in non-volatile memory.
4. After the detection is finished, unit will continue to operate for an additional 30 seconds.
NOTE If AHC push button is pushed or power is cycled on AHC is unable to verify all 22 volt DC electric heat relay(s) were energized using electric heater detection, configuration will be stopped. Configuration function must be repeated.
RECOMMEND USE FIGURE 20 AS A REFERENCE FOR SETTING JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.
Figure 23. Heat Mode Selection
Page 33
CBX32MV SERIES
EVENHEAT OPERATION
INPUTS OUTPUTS
Room Thermostat Demand Target Discharge Air Temperature Set at 85F
Target Discharge Air Temperature Set at 100F
Target Discharge Air Temperature Set at 115F/130F
Y1 Heat Pump First Stage Heat Pump First Stage Heat Pump First + First Electric Heat Section (H1)
Y1 + Y2 Heat Pump First and Second Stage
Heat Pump First and Second Stage + First Electric Heat Section (H1)
Heat Pump First and Second Stage + First Electric Heat Section (H1) + Second Electric Heat Sec tion (H2) if number of electric heat er sections detected is more than two.
Y1 + W1 and/or W2 Heat Pump First Stage + First Electric Heat Section (H1)
Heat Pump First Stage + First Electric Heat Section + Second Electric Heat Section (H2) if num ber of electric heater sections de tected is more than two.
Heat Pump First Stage + First Electric Heat Section (H1) Second Electric Heat Section (H2) if num ber of electric heater sections de tected is more than two.
Y1 and Y2 + W1 and/or W2 Heat Pump First and Second Stage+ First Electric Heat Section (H1)
Heat Pump First and Second Stage + First Electric Heat Section + Second Electric Heat Section (H2) if number of electric heater sections detected is more than two.
Heat Pump First and Second Stage + First Electric Heat Section (H1) Second Electric Heat Section (H2) if number of electric heater sections detected is more than two.
W1 and/or W2 First Electric Heat Section (H1)
First Electric Heat Section (H1) + Second Electric Heat Section (H2) if number of electric heater sec tions detected is more than two.
First Electric Heat Section (H1) + Second Electric Heat Section (H2) if number of electric heater sec tions detected is more than two.
Heat pump first or second stage or electric heat demand will start the Air Handler Control (AHC) indoor blower at CFM value based on tables found in installation instructions.
Heat Pump and electric heat demand?
Increase target discharge air temperature by 15F
Last room thermostat Heat up- staging action
Timer delays for 120 seconds
Timer delays for 150 seconds
A
One Stage More than one stage
No
Yes
Figure 24. EVENHEAT Operation (1 of 2)
Page 34
Discharge air temperature is
within target range?
W call with one Electric Heat Section ON
More Electric Heat
available
A
Measured discharge air temperature is above or
below target range?
Electric heat ON
150 seconds if more than one stage is activated or deacti vated.
EVENHEAT Operation
Start Timer Delay (Note 1)
Stop Delay Timer
Increase heat demand. Y1 (with or without Y2) +
W1 and W2
Discharge air temperature sensor setting on Air Handler Control will remain at set point. W1 demand will increase set point 15F. W2 demand will increase set point an additional 15F. (Total of 30F)
Delay Timer Finished or last change was up-
stage
Delay Timer Finished or last
change was down- stage
Above
Turn OFF Electric Heat Section
Adjust Target Discharge Air Temperature
Turn ON one Electric Heat
section
Adjust Target Discharge Air Temperature
NOTE Optional Outdoor Thermostat (Wired between R and W3) will lockout electric elements 3, 4 and 5.
Y1 ON and Y2 OFF
Activate Y2
Below
No
Yes
Note 1 Activation delay
120 seconds if one heat stage is or deactivated
No
No
No
No
No
Yes
Yes
Yes
Yes
Yes
Change in Heat demand from
room thermostat?
Adjust Target Discharge Air Temperature
Heat Pump OFF Discharge air temperature sensor setting on the Air Handler Control will remain at set point on W1 demand and be increased 15F for W2 demand.
Heat Pump ON
Figure 25. EVENHEAT Operation (2 of 2)
Page 35
CBX32MV SERIES
Heat Pump Operation (Heating and Cooling)
Room thermostat calls for first
stage?
Air Handler Control (AHC) receives inputs on Y1 terminal.
Y1 terminal on AHC is configured as input and passes signal from room thermostat to outdoor unit.
Y1 input to the AHC will control the indoor blower according to the cooling or heating mode blower speed, ramping and adjust selection jumper pins.
Air Handler Control (AHC) receives inputs on Y1 and O
terminals.
Y1 terminal on AHC is configured as input and passes signal from room thermostat to outdoor unit.
Y1 input to the AHC. Will control the indoor blower according to the cooling mode blower speed, ramping and adjust selection jumper pins.
Room thermostat calls for second stage?
Still calling for first stage?
Y2 terminal on AHC is configured as input and passes signal from room thermostat to outdoor unit.
Y2 terminal is an input to the AHC. The indoor blower will be controlled according to the jumper pin selections.
Still calling for second stage?
De-energize Y2 terminal on AHC. Indoor blower speed will reset to Y1 demand.
De-energize Y1 (and O in cooling) terminals on AHC.
De-energize indoor blower per ramping profile.
No
Yes
Cooling
Air Handler Control AHC) Indoor Blower Mode Speed and Profiles settings
1. Set Cooling Mode Blower Speed jumper pin . (Low and high indoor blower CFM settings are identical for cooling and heat pump)
2. Set Blower Adjust Selection jumper pin. 3. Set Cooling Mode Blower Ramping jumper pin (Cooling calls - All ramping profiles are active) (Heating calls -
Only ramping profiles 1 and 2 are active. If profiles 3 or 4 are selected, AHC will default to profile 1)
A Profile 1 does not provide any ramping profiles.
B Profile 2 provides a 30 second indoor blower ON delay at the start of a heat pump heating demand. (45 second indoor blower OFF delay)
4. Simultaneous Heat Pump and electric heat call: Indoor Blower will operate at the highest CFM requested by the heat pump or the electric heat blower speed selection.
Single or Two-Stage Unit
1. AHC on-AHC link must be cut between Y1 and Y2 to allow two stage cooling operation.
Heating
NOTE The outdoor unit control directly controls the outdoor unit operation.)
NOTE The outdoor unit control directly controls the outdoor unit operation.
NOTE The outdoor unit control directly controls the outdoor unit operation.)
NOTE The outdoor unit control directly controls the outdoor unit operation.
NOTE The outdoor unit control directly controls the outdoor unit operation.)
YesYes
Yes
Yes
No
No
2. AHC on-AHC link must be cut between R and O to allow heat pump operation.
CUT ON-BOARD LINK Y1-Y2 FOR TWO-STAGE A/C
Y1-Y2 2-STAGE COMPR
R-O HEAT PUMP
R-DS DEHUM
OR HARMONY
C U
T F
O R
O P
T IO
N
CUT ON-BOARD LINK R -O.
RECOMMEND USE FIGURE 20 AS A REFERENCE FOR SETTING JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.
IMPORTANT USE CARE WHEN CUTTING LINKS TO PREVENT DAMAGE TO CONTROL. SEE FIGURE 20, CBX32MV JUMP AND LINK GUIDE FOR FURTHER
DETAILS.
Page 36
Cooling Operation
Room thermostat calls for first
stage?
Air Handler Control (AHC) receives inputs on Y1 terminal.
Y1 terminal on AHC is configured as input and passes signal from room thermostat to outdoor unit.
Y1 input to the AHC will control the indoor blower according to the cooling or heating mode blower speed, ramping and adjust selection jumper pins.
Room thermostat calls for second stage?
Still calling for first stage?
Y2 terminal on AHC is configured as input and passes signal from room thermostat to outdoor unit.
Y2 terminal is an input to the AHC. The indoor blower will be controlled according to the jumper pin selections.
Still calling for second stage?
NOTE - The outdoor unit control directly controls the outdoor unit operation.
De-energize Y1 (and O in cooling) terminal on AHC.
De-energize indoor blower per ramping profile.
No
Yes
AHC on-board link must be cut between Y1 and Y2 to allow 2 stage cooling operation.
Air Handler Control AHC) Indoor Blower Mode Speed and Profiles settings
1. Set Cooling Mode Blower Speed jumper pin. 2. Set Cooling Mode Blower Ramping jumper pin.
3. Set Blower Adjust Selection jumper pin. Single or Two-Stage Unit
NOTE - The outdoor unit control directly controls the outdoor unit operation.
De-energize Y2 terminal on AHC. Indoor blower speed will reset to Y1 demand.
NOTE - The outdoor unit control directly controls the outdoor unit operation.
NOTE - The outdoor unit control directly controls the outdoor unit operation.
YesYes
Yes
Yes
No
No
CUT ON-BOARD LINK Y1-Y2 FOR TWO-STAGE A/C
Y1-Y2 2-STAGE COMPR
R-O HEAT PUMP
R-DS DEHUM
OR HARMONY
C U
T F
O R
O P
T IO
NRECOMMEND USE FIGURE 20 AS A REFERENCE FOR SETTING JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.
IMPORTANT - Use care when cutting links to prevent damage to control. See figure 20, CBX32MV jump and link guide for further details.
Page 37
CBX32MV SERIES
Error Code / Recall Mode
To enter Error Code Mode, push and hold button next to single character LED display until solid E symbol appears, release button.
AHC in Idle Mode (No heating cooling or indoor
fan operation)
Turn room thermostat to OFF
Control will display up to ten error codes stored in memory. If E 0 0 0 is displayed, there are no stored error codes.
To exit Error Code Recall Model, push and hold button next to single character LED display until solid three horizontal bars appears, then release button.
To clear error codes stored in memory, continue to hold push button while the solid three horizontal bars are displayed. Release button when solid is displayed.
Solid c starts blinking on single character LED
display.
The display will blink for up to ten seconds. During this time, press the button and release to confirm deletion of the error code history. As confirmation, AHC will display 0 0 0 0 . (If ten second period expires or push button is not released, control will automatically exit Error Code Mode and go into mode without deleting error code history.
Yes No
NOTE Once the error code history is deleted, it cannot be recovered.
NOTE Error Codes are not cleared from memory.
Page 38
Indoor Blower Test
Indoor Blower Test Mode
AHC in Idle Mode (No heating cooling or indoor
fan operation)
To indoor blower test mode, push and hold button next to single character LED display until (Solid bar), then release button. Turn room thermostat to
OFF
(Solid bar) starts blinking .
Push and hold button until the solid A symbol is displayed on the single character LED display, then release button.
Control will cycle the indoor blower motor for ten seconds at 70% of maximum air for selected capacity size unit. Control will indoor blower test mode.
Yes No
Operation
COOLING (COOLING ONLY OR HEAT PUMP)
When the thermostat calls for cooling, 24 volts is applied to the blower time-delay relay coil. After a delay, the indoor blower relay energizes. The normally open contacts close, causing the indoor blower motor to operate. The circuit between R and Y is completed, closing the circuit to the
contactor in the outdoor unit, starting the compressor and outdoor fan motor.
On heat pumps, circuit R and O energizes the reversing valve, switching the valve to the cooling position. (The reversing valve remains energized as long as the thermostat selector switch is in the COOL position.)
At the completion of the cooling demand and after the
relay's timedelay, the compressor and outdoor fan will cycle off.
HEATING (ELECTRIC HEAT ONLY)
When the thermostat calls for heat, the circuit between R and W is completed, and the heat sequencer is energized. A time delay follows before the heating elements and the indoor blower motor come on. Units with a second heat
sequencer can be connected with the first sequencer to W on the thermostat subbase, or they may also be connected to a second stage on the subbase.
HEATING (HEAT PUMP)
When the thermostat calls for heating, 24 volts is applied to the blower time-delay relay coil. After a delay, the normally open contacts close, causing the indoor blower motor to operate. The circuit between R and Y is completed, closing the circuit to the contactor in the outdoor unit, starting the compressor and outdoor fan motor. Circuit R and G
energizes the blower relay, starting the indoor blower motor.
Page 39
CBX32MV SERIES
If the room temperature continues to decrease, the circuit between R and W1 is completed by the secondstage heat room thermostat. Circuit R-W1 energizes a heat sequencer. The completed circuit will energize supplemental electric heat (if applicable). Units with a second heat sequencer can be connected with the first
sequencer to W1 on the thermostat. They may also be connected to a second heating stage W2 on the thermostat subbase.
EMERGENCY HEAT (HEATING HEAT PUMP)
If the selector switch on the thermostat is set to the
emergency heat position, the heat pump will be locked out of the heating circuit, and all heating will be electric heat (if applicable). A jumper should be placed between W2 and E on the thermostat subbase so that the electric heat control will transfer to the firststage heat on the thermostat. This will allow the indoor blower to cycle on and off with the electric heat when the fan switch is in the AUTO position.
Repairing or Replacing Cabinet Insulation
IMPORTANT DAMAGED INSULATION MUST BE REPAIRED OR REPLACED before the unit is put back into operation. In sulation loses its insulating value when wet, damaged, separated or torn.
Matt or foil-faced insulation is installed in indoor equipment to provide a barrier between outside air conditions (surrounding ambient temperature and humidity) and the varying conditions inside the unit. If the insulation barrier is damaged (wet, ripped, torn or
separated from the cabinet walls), the surrounding ambient air will affect the inside surface temperature of the cabinet. The temperature/humidity difference between the inside and outside of the cabinet can cause condensation on the inside or outside of the cabinet which leads to sheet metal corrosion and subsequently, component failure.
REPAIRING DAMAGED INSULATION
Areas of condensation on the cabinet surface are an indication that the insulation is in need of repair.
If the insulation in need of repair is otherwise in good
condition, the insulation should be cut in an X pattern, peeled open, glued with an appropriate all-purpose glue and placed back against the cabinet surface, being careful to not overly compress the insulation so the insulation can retain its original thickness. If such repair is not possible, replace the insulation. If using foilfaced insulation, any
cut, tear, or separations in the insulation surface must be taped with a similar foil-faced tape.
1. CUT INSULATION IN X PATTERN 2. APPLY GLUE 3. PRESS GLUED TABS AGAINST CABINET
GLUE -make sure there is full coverage of glue on the metal or insulation so there are no areas where air pockets may form which can lead to sweating.
Figure 26. Repairing Insulation
WARNING Electric Shock Hazard.
Can cause injury or death.
Foilfaced insulation has conductive characteristics similar to metal. Be sure there are no electrical connections within a of the insulation. If the foilfaced insulation comes in contact with electrical voltage, the foil could provide a path for current to pass through to the outer metal cabinet. While the current produced may not be enough to trip existing electrical safety devices (e.g. fuses or circuit breakers), the current can be enough to cause an electric shock hazard that could cause personal injury or death.
Homeowner Maintenance
IMPORTANT Do not operate system without a filter. A filter is required to protect the coil, blower, and internal parts from exces sive dirt and dust. The filter is placed in the return duct by the installer.
Inspect air filters at least once a month and replace or clean as required. Dirty filters are the most common cause of inadequate heating or cooling performance.
Replace disposable filters. Cleanable filters can be cleaned by soaking in mild detergent and rinsing with cold water.
Install new/clean filters with the arrows on the side pointing in the direction of airflow. Do not replace a cleanable (high velocity) filter with a disposable (low velocity) filter unless return air system is properly sized for it.
If water should start coming from the secondary drain line, a problem exists which should be investigated and corrected. Contact a qualified service technician.
Page 40
Checkout Procedures
NOTE - Refer to outdoor unit installation instructions for
system start-up instructions and refrigerant charging
instructions.
PRESTARTUP CHECKS
Is the air handler properly and securely installed?
If horizontally configured, is the unit sloped up to 1/4
inch toward drain lines?
Will the unit be accessible for servicing?
Has an auxiliary pan been provided under the unit with
separate drain for units installed above a finished ceiling or in any installation where condensate overflow could cause damage?
Have ALL unused drain pan ports been properly
plugged?
Has the condensate line been properly sized, run,
trapped, pitched, and tested?
Is the duct system correctly sized, run, sealed, and
insulated?
Have all cabinet openings and wiring been sealed?
Is the indoor coil factoryinstalled TXV properly sized
for the outdoor unit being used?
Have all unused parts and packaging been disposed
of properly?
Is the filter clean, in place, and of adequate size?
Is the wiring neat, correct, and in accordance with the
wiring diagram?
Is the unit properly grounded and protected (fused)?
Is the thermostat correctly wired and in a good
location?
Are all access panels in place and secure?
CHECK BLOWER OPERATION
Set thermostat to FAN ON.
The indoor blower should come on.
CHECK COOLING OPERATION
Set thermostat to force a call for cooling
(approximately 5F lower than the indoor ambient temperature).
The outdoor unit should come on immediately and the
indoor blower should start between 30 - 60 seconds later.
Check the airflow from a register to confirm that the
system is moving cooled air.
Set the thermostat 5F higher than the indoor
temperature. The indoor blower and outdoor unit should cycle off.
CHECK ELECTRIC HEATER (IF USED)
Set thermostat to call for auxiliary heat (approximately
5F above ambient temperature). The indoor blower
and auxiliary heat should come on together. Allow a minimum of 3 minutes for all sequencers to cycle on.
Set the thermostat so that it does not call for heat.
Allow up to 5 minutes for all sequencers to cycle off.
Use of Air Handler During Construction
Lennox does not recommend the use of its air handler unit during any phase of construction. Very low return air temperatures, harmful vapors and operation of the unit with clogged or misplaced filters will damage the unit.
Air handler units may be used for heating (heat pumps) or cooling of buildings under construction, if the following conditions are met:
A room thermostat must control the air handler. The
use of fixed jumpers is not allowed.
Air filter must be installed in the system and must be
maintained during construction.
Air filter must be replaced upon construction
completion.
The air handler evaporator coil, supply fan assembly
and duct system must be thoroughly cleaned following
final construction clean-up.
All air handler operating conditions must be verified
according to these installation instructions.
Page 41
CBX32MV SERIES
1 Duct
System
Filter
Integrated Control
Electric Heat Amps
Duct Static
5
Line Voltage
3
RETURN AIR
SUPPLY AIR
Temperature
8
Blower Motor Amps6
7
Thermostat
9
2
4 Drain Line
Disconnect Switch
ELECTRIC HEAT AMPS____________
8
8
7
5DUCT SYSTEM
SUPPLY AIR DUCT
Sealed
Insulated (if necessary)
Registers Open and Unobstructed
RETURN AIR DUCT
Sealed
Filter Installed and Clean
Registers Open and Unobstructed
INTEGRATED CONTROL
Jumpers Configured Correctly (if applicable)
Appropriate Links in Place (if applicable)
VOLTAGE CHECK
Supply Voltage ___________
Electrial Connections Tight
1
2
3
DRAIN LINE
Leak Free
4
TOTAL EXTERNAL STATIC (dry coil)
Supply External Static ______ ______
TEMPERATURE DROP (Cooling Mode)
Return Duct Temperature ___________
THERMOSTAT
Adjusted and Programmed
Return External Static ______ ______
Total External Static = ______ ______
6
Supply Duct Temperature ___________
Temperature Drop = ___________
TEMPERATURE RISE (Heating Mode)
Return Duct Temperature __________
Supply Duct Temperature __________
Temperature Rise = __________
Operation Explained to Owner
9
Explained Operation of System to Homeowner
Technicians Name:_______________________Date StartUp & Performance Check Completed__________
Installing Contractors Name_______________________
Installing Contractors Phone_______________________ Job Address____________________________________
Installing Date_______________________________
Air Handler Model #___________________________
INDOOR BLOWER AMPS___________
INDOOR BLOWER CFM____________
Low Voltage _____________
dry coil wet coil
Figure 27. Start-Up and Performance Checklist (Upflow Configuration)
Page 42
RETURN AIR SUPPLY
AIR
2
Duct Static
5
Line Voltage
3
4 Drain Line
ELECTRIC HEAT AMPS____________
8
8
7
5
Filter
Blower motor Amps
DUCT SYSTEM
SUPPLY AIR DUCT
Sealed
Insulated (if necessary)
Registers Open and Unobstructed
RETURN AIR DUCT
Sealed
Filter Installed and Clean
Registers Open and Unobstructed
INTEGRATED CONTROL
Jumpers Configured Correctly (if applicable)
Appropriate Links in Place (if applicable)
VOLTAGE CHECK
Supply Voltage ___________
Electrial Connections Tight
1
2
3
DRAIN LINE
Leak Free
4
TOTAL EXTERNAL STATIC (dry coil)
Supply External Static ______ ______
TEMPERATURE DROP (Cooling Mode)
Return Duct Temperature ___________
THERMOSTAT
Adjusted and Programmed
Return External Static ______ ______
Total External Static = ______ ______
6
6
Supply Duct Temperature ___________
Temperature Drop = ___________
TEMPERATURE RISE (Heating Mode)
Return Duct Temperature __________
Supply Duct Temperature __________
Temperature Rise = __________
Operation Explained to Owner
9
Electric Heat Amps
7
Explained Operation of System to Homeowner
Technicians Name:_______________________Date StartUp & Performance Check Completed__________
Installing Contractors Name_______________________ Installing Contractors Phone_______________________
Job Address____________________________________
Installing Date_______________________________ Air Handler Model #___________________________
Thermostat
9 1 1
8
INDOOR BLOWER AMPS___________
Temperature
Duct Syst
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