Lennox CBX32MV Installation Instructions PDF

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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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