Lennox CBX32MV, variable speed air handlers cbx32mv Installation Instructions Manual

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INSTALLATION

E2011 Lennox Industries Inc.

Dallas, Texas, USA

NOTICE

A thermostat is not included and must be ordered separately.

D The Lennox icomfort Touch thermostat must be used

in communicating applications.

D In non−communicating applications, the Lennox

ComfortSense 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.

7000 thermostat may be used, as well

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.

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 (if required for downflow

configuration only) 1  Drip shield (for −068 only)

INSTRUCTIONS

Dave Lennox Signature Collection CBX32MV Units

MULTI−POSITION AIR HANDLER

506274−01 06/11 Supersedes 01/11

RETAIN THESE INSTRUCTIONS FOR FUTURE

REFERENCE

Table of Contents

Shipping and Packing List 1. . . . . . . . . . . . . . . . . . . . . .

Upflow/Downflow Unit Dimensions 2. . . . . . . . . . . . . .

Horizontal LH/RH Unit Dimensions 3. . . . . . . . . . . . . .

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 25. . . . . . . . . . . . . . . . . . . . . . . . . . . .

Configuring Unit 28. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Error Code Recall Mode 35. . . . . . . . . . . . . . . . . . . . . . . .

Indoor Blower Test 36. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Checkout Procedures 36. . . . . . . . . . . . . . . . . . . . . . . . . .

Operation 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Maintenance 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Cabinet Insulation 37. . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Litho U.S.A.

IMPORTANT INFORMATION TO INSTALLER

CHECK FOR AND REMOVE THE FOLLOWING ITEMS BEFORE OPERATING UNIT.

BLOWER HOUSING SUPPORT PAD.

REFRIGERANT LINE PLUGS (SEE BRAZING CONNECTION

ON PAGE 9] .

FOR PROPER OPERATION THE ELECTRIC HEAT (IF APPLICABLE) MUST BE CONFIGURED (SET−UP) THROUGH THE AIR HANDLER CONTROL (AHC)

WHENEVER ELECTRIC HEAT IS INSTALLED THE AHC MUST BE MANUALLY CONFIGURED. SEE JUMPERS AND LINKS GUIDE ON

PAGE 20.

06/11 506274−01

TOP CAP SHIPPING BRACKET (REPLACE

SCREWS IN TOP CAP AFTER REMOVAL).

CONFIGURE ELECTRIC HEAT

ELECTRIC HEAT SECTIONS MUST BE CONFIGURED. IF INSTALLED SEE

PROCEDURE IN FIGURE 24 ON PAGE 30.

*2P0611* *P506274-01*

Page 1

HORIZONTAL DRAIN PAN (SEE

UPFLOW APPLICATIONS ON PAGE 5 AND DOWNFLOW APPLICATIONS ON PAGE 8 )

ECB40

Upflow and Downflow Unit Dimensions  Inches (millimeters)

3/4 (19)

SUPPLY AIR

OPENING

11-1/16 (281)

LINE VOLTAGE

INLETS (TOP

AND LEFT SIDE)

TOP VIEW

3/4 (19)

LOW VOLTAGE

INLETS (TOP AND

RIGHT SIDE)

5/8 (16)

AIR

FLOW

OPTIONAL

ELECTRIC HEAT

(FIELD−INSTALLED)

SUCTION

RETURN AIR

5/8 (16) 1 (25)

KNOCKOUT FOR OPTIONAL HEALTHY

CLIMATE® GERMICIDAL UVC LIGHT.

FRONT VIEW

FILTER ACCESS

5/8 (16)

UPFLOW POSITION

LINE

LIQUID

LINE

FILTER

COIL

2-3/4 (70)

5/8 (16)

PIPING PLATE DETAIL

1-3/4 (44)

FILTER

SUCTION

LINE

LIQUID

LINE

OPTIONAL

ELECTRIC HEAT

(FIELD−INSTALLED)

LOW VOLTAGE

(RIGHT SIDE)

LINE VOLTAGE

(LEFT SIDE)

4-3/8 (111)

SUCTION LINE

CONDENSATE DRAINS (2) (HORIZONTAL)

LIQUID LINE

CONDENSATE DRAINS (2) (UPFLOW AND DOWNFLOW)

3-1/2 (89)

11-1/16 (281)

(FOR UPFLOW AND DOWNFLOW POSITIONS)

1-1/8 (29)

(51)

5-3/8 (137)

BLOWER

RETURN AIR

SIDE VIEW

5/8 (16)

COIL

BLOWER

SUPPLY

AIR

5/8 (16)

KNOCKOUT FOR OPTIONAL HEALTHY

CLIMATE® GERMICIDAL UVC LIGHT.

SIDE VIEW

DOWNFLOW POSITION

5/8 (16)

RETURN

OPENING

1 (25)

TOP VIEW

AIR FLOW

SUPPLY AIR

FRONT VIEW

5/8 (16)

AIR

FILTER ACCESS

5/8 (16)

Dim.

Model Dimensions (Upflow, Downflow, Left− and Right−Hand Horizontal applications)

−018/024 −024/030 −036 −048 and −060 −068

in. (mm) in. (mm) in. (mm) in. (mm) in. (mm)

45−1/4 (1149) 49−1/4 (1251) 51 (1295) 58-1/2 (1486) 65 (1651)

16−1/4 (413) 21−1/4 (540) 21-1/4 (540) 21-1/4 (540) 21−1/4 (540)

20−5/8 (524) 20−5/8 (524) 22-5/8 (575) 24-5/8 (625) 26−5/8 (676)

14−3/4 (375) 19−3/4 (502) 19-3/4 (502) 19-3/4 (502) 19−3/4 (502)

19 (483) 19 (483) 21 (533) 23 (584) 25 (635)

15 (381) 20 (508) 20 (508) 20 (508) 20 (508)

24−5/8 (625) 24−5/8 (625) 26-3/8 (670) 27-7/8 (708) 32−3/8 (822)

20−5/8 (524) 24−5/8 (625) 24-5/8 (625) 30-5/8 (778) 32−5/8 (829)

Page 2

Horizontal Left− and Right−Hand Unit Dimensions  Inches (mm)

5-3/8 (137)

CONDENSATE

DRAINS (2)

(UPFLOW AND

DOWNFLOW)

CONDENSATE

DRAINS (2)

(HORIZONTAL)

PIPING PLATE

DETAIL

5/8 (16)

5-3/4

(46)

RETURN AIR

OPENING

END VIEW

Horizontal Position

(Left-Hand Air

Discharge)

1-3/4

(44)

(51)

1-1/2

(38)

1 (25)

FILTER ACCESS

LIQUID

LINE

SUCTION

LINE

1-1/8

(29)

4-3/8 (111)

FILTER

Horizontal Position

(Right-Hand Air

Discharge)

COIL

LIQUID

SUCTION

LINE

TOP VIEW

AIR

FLOW

FRONT VIEW

BLOWER

OPTIONAL ELECTRIC

HEAT (FIELD−INSTALLED)

COIL

5/8 (16)

INLETS (BOTTOM

LINE VOLTAGE

INLETS (TOP

AND RIGHT

SIDE)

LOW VOLTAGE

AND RIGHT

SIDE)

FOR DIMENSIONS A" THROUGH

H", SEE CHART ON PAGE 2.

11-1/16

3/4 (19)

(281)

SUPPLY

4-3/8 (111)

1-1/8

(29)

AIR

OPENING

END VIEW

3/4 (19)

LOW VOLTAGE

3/4 (19)

11-1/16

(281)

SUPPLY

OPENING

LINE VOLTAGE INLETS

(BOTTOM AND LEFT SIDE)

END VIEW

INLETS (TOP AND

AIR

LEFT SIDE)

OPTIONAL ELECTRIC

HEAT (FIELD INSTALLED)

5/8 (16)

CONDENSATE DRAINS (2)

(HORIZONTAL)

AIR

FLOW

FRONT VIEW

FILTER

TOP VIEW

SUCTION

LINE

1-3/4

(44)

LIQUID

LINE

5-3/4 (146)

SUCTION LINE

PIPING PLATE

DETAIL

FILTER ACCESS

1-1/2 (38)

LIQUID

LINE

1 (25)

(51)

RETURN

AIR OPENING

END VIEW

5-3/8 (137)

5/8 (16)

Page 3

CBX32MV SERIES

Model Number Identification

Unit Type

CB = Air Handler

Refrigerant Type

X = R410A

Series

Configuration

MV = Multi−Position, Variable

speed blower motor

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)

230

CB 32 036−01

−X

−−6

Minor Revision Number

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)

Voltage

230 = 208/230V−60hz−1ph

General

This indoor unit is designed for installation with optional field−installed electric heat and a matched remote 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 (CTXV), which is suitable for use in HFC−410A applications.

This air handler is compatible with the ComfortSense® 7000 non−communicating thermostat and non−communicating outdoor units. In addition, this unit has the enhance capability of communicating with the icomfort Touch® thermostat and compatible 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.

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

Physical contact with metal edges and corners while applying excessive force or rapid motion can result in personal injury. Be aware of, and use caution when working near these areas during installation or while servicing this equipment.

Installation Clearances

Cabinet 0 inch (0 mm)

To Plenum 1 inch (25 mm)

To Outlet Duct within 3 feet (914 mm)

Floor See Note #1

Service / Maintenance See Note #2

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).

1 inch (25 mm)

WARNING

Product contains fiberglass wool.

Disturbing the insulation in this product during installation, maintenance, or repair will expose you to fiberglass wool. Breathing this may cause lung cancer. (Fiberglass wool is known to the State of California to cause cancer.)

Fiberglass wool may also cause respiratory, skin, and eye irritation.

To reduce exposure to this substance or for further information, consult material safety data sheets available from address shown below, or contact your supervisor.

Lennox Industries Inc. P.O. Box 799900 Dallas, TX 75379−9900

Page 4

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.

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

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:

S NFPA No. 90A  Standard for Installation of Air

Conditioning and Ventilation Systems

S 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.

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 airflow 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

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:

S Connected to secondary drain pan

S 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.

Page 5

CBX32MV SERIES

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.

UP−LOAD / DOWNFLOW

DRAIN PAN

HORIZONTAL DRIP SHIELD (−068

MODELS)

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.

1/2 IN. SCREWS MAXIMUM

ANGLE IRON OR

SHEET METAL

ELECTRICAL INLET

CLEARANCE 4 IN. (102 MM)

HORIZONTAL DRAIN

PAN

NO ADJUSTMENT IS NECESSARY

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.

FRONT VIEW END VIEW

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 6

CABINET

SUPPORT

DRAIN PAN

REINSTALLED

HERE

TOP CAP ROTATED TO

CORRECT POSITION

90º

BEND

TOP CAP SCREWS

3/16" PLASTIC PLUG (REAR COIL END SEAL)

HORIZONTAL DRIP SHIELD SCREW (FRONT COIL END SEAL)

DRAIN PAN SHIPPING LOCATION

INSTALL DRAIN PAN

BETWEEN TAB AND

EXTERIOR INNER WALL.

DETAIL C

REINSTALLED HERE REMOVED FROM HERE

 DRAIN PLUGS 

FRONT VIEW

COIL SHOWN IN UPFLOW POSITION FOR EASY

CONVERSION (LEFT−HAND AIR DISCHARGE)

DETAIL A

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 180º front-to-back 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 180º 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.

TOP CAP

DETAIL B

90º

BEND

ALIGN HOLES WITH HOLES IN COIL END PLATE.

BACK COIL END SEAL

9. Rotate top cap 180º front-to-back and align with unused screw holes. Holes must align with front and back coil end plates. The top cap has a 45º bend on one side and a 90º bend on the other. The 90º 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 90º 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 7

CBX32MV SERIES

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:

D Apply the longer piece of 1-inch 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

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 180º 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:

D 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.

Page 8

DRIP SHIELD

SIDE VIEW

2" WIDE FOAM TAPE

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.

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.

AIR

HANDER

UNIT

COMBUSTIBLE FLOOR

PROPERLY SIZED

FLOOR OPENING

ADDITIVE BASE

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.

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).

1-5/8 (41)

−024/−030 AND

1-5/8 (41)

22-1/8 (562) OTHER MODELS

5/8 (16)

TOP VIEW

11-3/8

(289)

−018/−024 15 (381)

UP 20 (508)

24 (610) −068 ONLY

13-3/8 (340)

OPENING

SIDE VIEW

−018/−024 08−1/4 (464)

−024/−030 and up 23−1/4 (591)

SUPPLY AIR OPENING

INCHES (MM)

2 (51)

Figure 10. Downflow Combustible Base Dimensions

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 9

CBX32MV SERIES

PLEASE READ IMPORTANT ISSUES CONCERNING BRAZING

OPERATIONS ON PAGE 10 BEFORE PROCEEDING.

USE A WET RAG TO PROTECT CTXV

SENSING BULB WHEN BRAZING SUCTION LINE CONNECTIONS.

NOTE  REFER TO OUTDOOR UNIT INSTALLATION INSTRUCTIONS FOR REFRIGERANT PIPING SIZE REQUIREMENTS.

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.

REMOVE ACCESS PANEL

REMOVE RUBBER PLUG FROM BOTH LIQUID

AND SUCTION LINES

NOTE  CBX32 MV 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.

EITHER REMOVE OR PUSH PIPE WRAPPING BACK

THROUGH HOLE IN PIPING PLATE BEFORE LINE SET CONNECTION AND BRAZING.

LOW

PIPING PLATE

HIGH

CONNECT PIPES

NOTE  REFRIGERANT LINE SETS SHOULD BE ROUTED TO ALLOW FILTER ACCESSIBILITY.

REPEAT PREVIOUS PROCEDURE FOR LIQUID

LINE.

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.

PLACE A WET RAG AGAINST PIPING

PLATE AND AROUND THE SUCTION LINE CONNECTION. A

BRAZE CONNECTION. ALLOW PIPE TO

COOL BEFORE REMOVING WET RAG FROM CTXV SENSING BULB AND PIPING PANEL AREA.

CONNECT GAUGES AND

START NITROGEN FLOW

NITROGEN

REFER TO INSTRUCTIONS PROVIDED WITH OUTDOOR UNIT FOR LEAK TESTING, EVACUATING AND CHARGING PROCEDURES

Figure 11. Brazing Connections

Page 10

Table 3. CBX32MV Refrigerant Connections and

Line Set Requirements

Models

−018/024

−024/030 and −036

−048

−060

−068

NOTE  Some applications may required a field provided 7/8" to 1−1/8" adapter

Liquid Line

3/8" (10mm)

Vapor / Suction Line

5/8" (16mm)

3/4" (19mm)

7/8" (22mm)

1−1/8" (29mm)

L15 Line Set

L15 line set sizes are dependent on unit matchups. See CBX32MV Engineering Handbook to determine correct line set sizes.

Field−fabricated

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

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

OVERFLOW

DRAIN ON LEFT

UPFLOW OR DOWNFLOW

RIGHT−HAND AIR

DISCHARGE

MAIN DRAIN ON

RIGHT

Figure 12. Main and Overflow Drain Locations

based on Coil Orientation

BEST PRACTICES

The following best practices are recommended to ensure better condensate removal:

S Main and overflow drain lines should NOT be smaller

than both drain connections at drain pan.

S Overflow drain line should run to an area where

homeowner will notice drainage.

S It is recommended that the overflow drain line be

vented and a trap installed. Refer to local codes.

Page 11

CBX32MV SERIES

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.

LENNOX #

X3169

COMPACT OVERFLOW SWITCH WITH 3/4" FEMALE SLIP INLET

AND MALE ADAPTER, TWO PART DESIGN FOR USE WHERE OBSTRUCTIONS PREVENT DIRECT THREADING

CLEAN OUT

PRESS IN

(DO NOT GLUE)

VENT MUST EXTEND

ABOVE HEIGHT OF

COIL DRAIN PAN BY

TWO INCHES (51MM)

VENT

AIR HANDLER DRAIN PAN

OVERFLOW

DRAIN

YES

NOTE  WHEN A AIR HANDLER IS LOCATED ABOVE A FINISHED SPACE THE SECONDARY

DRAIN PAN MUST HAVE A LARGER FOOTPRINT THAN THE AIR HANDLER.

SECONDARY

DRAIN PAN

OPTIONAL

MAIN

DRAIN

SAFETY

PAN

WHEN A COIL IS LOCATED ABOVE A FINISHED SPACE, A 3/4" (19.1MM) SECONDARY DRAIN LINE MUST BE:

S CONNECTED TO SECONDARY DRAIN PAN

S 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).

*LENNOX P−TRAP 49P66 REQUIRES A LARGER INSTALLATION SPACE THAN THE J−TRAP 91P90.

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.

1" X 3/4" X 3/4"

REDUCING

TEE WITH

PLUG

LENNOX* P−TRAP

49P66, J−TRAP #

91P90 OR ANY

PVC SCH 40 P− OR

J−TRAP 3/4"

FOR NEGATIVE PRESSURE COILS (BLOWER AFTER COIL) TRAPS ARE REQUIRED ON ALL DRAIN LINES CONNECTED TO COIL.

(51MM)

TRAP DEPTH

TO APPROVED

DRAIN

DRAIN LINE SHOULD SLOPE A MINIMUM OF ONE INCH PER 10 FEET (25MM PER 3 METERS)

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 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 12

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.

Foil-faced insulation has conductive characteristics similar to metal. Be sure there are no electrical connections within a ½" of the insulation. If the foil-faced 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.

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 voltage opening. Run line voltage wiring only through specified 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 properly circuit breaker.

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 wit h 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 19.

Page 13

CBX32MV SERIES

Figure 14. CBX32MV Air Handler Unit Typical Wiring Diagram

Page 14

NOTE − Due to varying duct designs and airflow conditions, relocation of the discharge sensor may be required to insure accurate sensing.

ELECTRIC HEAT RELAY

PART NO. 49W91

19 IN.

(483 MM)

5−1/2 IN.

(140 MM)

SENSOR

(CENTER SIDE−T0 −SIDE)

DETAIL A

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).

DISCHARGE SENSOR

TEMPERATURE RESISTANCE

(DAT)

CHART

TEMP RESISTANCE ºF (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

22V DIRECT CURRENT COIL

30 AMP CONTACT RATING

DETAIL B

CONNECTOR

9−PIN CONNECTOR

9−PIN

FASTEN THE PROBE

BRACKET TO THE

PLENUM WITH TWO

SELF−TAPPING SHEET

AIR HANDLER CONTROL

SECURING SCREWS

AIR HANDLER CONTROL L−BRACKET MOUNTING PLATE

CBX32MV AIR HANDLER CONTROL

PART NO. 50W28

PLENUM

METAL SCREWS.

NOTE  EVENHEAT MODE CANNOT BE ENABLED WITH HARMONY III DISCHARGE AIR SENSOR.

DUE TO EACH CONTROL REQUIRING ITS OWN

CONNECT WIRES TO DISCHARGE AIR SENSOR

TERMINAL ON AIR HANDLER CONTROL.

Figure 15. Component Connections

Page 15

CBX32MV SERIES

Heat Pump or Air Conditioner Control

Air Handler or Furnace

Control

i−

OUTDOOR UNIT

icomfort Toucht

THERMOSTAT

i−

THERMOSTAT

i−

Outdoor sensor for outdoor temperature display

OUTDOOR AIR SENSOR

(Optional).

Figure 16. Control (Field) Wiring  Communicating System (icomfort Toucht Thermostat)

Page 16

AIR CONDITIONER UNIT (TWO−STAGE)

BROWN

YELLOW

BLUE

BLACK

RED

CBX32MV

COMFORTSENSE T 7000

AIR HANDLER CONTROL COMES FROM FACTORY WITH A METAL JUMPERS BETWEEN W1 TO W2 AND W2 TO W3. SEE FIGURE 22 FOR HEAT SECTION CONFIGURATION.

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).

L CONNECTION WIRED ON UNITS WITH LSOM.

IMPORTANT  USE CARE WHEN CUTTING LINKS TO PREVENT DAMAGE TO CONTROL. SEE FIGURE 21, CBX32MV JUMP AND LINK GUIDE FOR FURTHER DETAILS.

CUT ON−BOARD LINK Y1−Y2 FOR TWO−STAGE AC

DO NOT CUT ON−BOARD LINK R −O.

CUT ON−BOARD LINK R−DS WHEN DEHUMIDIFICATION TERMINAL IS USED.

Figure 17. Control (Field Wiring)  Cooling Application (Non−Communicating)

AIR HANDLER

CONTROL

Y1−Y2

2−STAGE

COMPR

R−O

HEAT

PUMP

R−DS

DEHUM

HARMONY

CUT FOR OPTION

HEAT PUMP

UNIT

(TWO−STAGE)

OUT

CBX32MV

W1 W1

Figure 18. Control (Field Wiring)  Heat Pump (Non−Communicating)

COMFORTSENSE

T 7000

SENSOR

Y2Y2

O. D.

(X2658)

X2658 OUTDOOR SENSOR IS REQUIRED FOR OUTDOOR

TEMPERATURE DISPLAY, DEW POINT CONTROL, HEAT PUMP AND DUAL FUEL BALANCE POINTS.

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).

FIELD PROVIDED JUMPER BETWEEN Y2 OUT BL ON

HEAT PUMP TO Y2 ON CX32MV.

IMPORTANT  USE CARE WHEN CUTTING LINKS TO PREVENT DAMAGE TO CONTROL. SEE FIGURE 21, CBX32MV JUMP AND LINK GUIDE FOR FURTHER DETAILS.

CUT ON−BOARD LINK Y1−Y2 FOR TWO−STAGE HP

CUT ON−BOARD LINK R −O.

CUT ON−BOARD LINK R−DS WHEN DEHUMIDIFICATION TERMINAL IS USED.

Y1−Y2

2−STAGE

COMPR

R−O

HEAT

PUMP

R−DS

DEHUM

HARMONY

CUT FOR OPTION

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

OUTDOOR SENSOR (X2658)

RED

FAN RELAY

PUR

BLK

PUR

EDA UNIT

YEL

BLU

BLK

BRN

CBX32MV

OUTDOOR UNIT

NOTES − /1\

NOT REQUIRED FOR APPLICATIONS WITHOUT LSOM

/2\

NOT REQUIRED WITH SINGLE-SPEED OUTDOOR FAN

/3\

NOT REQUIRED FOR SINGLE STAGE

AIR HANDLER CONTROL COMES FROM FACTORY WITH A METAL

JUMPERS BETWEEN W1 TO W2 AND W2 TO W3. SEE FIGURE 22 FOR HEAT SECTION CONFIGURATION.

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).

COMFORTSENSEt 7000 THERMOSTAT

CUT ON−BOARD LINK R−DS WHEN DEHUMIDIFICATION

IMPORTANT  USE CARE WHEN CUTTING LINKS TO PREVENT DAMAGE TO CONTROL. SEE FIGURE 21, CBX32MV JUMP AND LINK GUIDE FOR FURTHER DETAILS.

CUT ON−BOARD LINK Y1−Y2 FOR TWO−

DO NOT CUT ON−BOARD LINK R −O.

STAGE A/C

TERMINAL IS USED.

Y1−Y2

2−STAGE

COMPR

R−O

HEAT

PUMP

R−DS

DEHUM

HARMONY

CUT FOR OPTION

Figure 19. Control (Field Wiring)  Cooling Application (Humiditrol

Fan Relay Wiring) Non−Communicating

OUTDOOR UNIT

FAN RELAY (NOT REQUIRED WITH SINGLE−SPEED OUTDOOR FAN)

RED

PURPLE

BLACK

YELLOW

BLUE

BROWN (NOT USED FOR APPLICATIONS WITHOUT LSOM

BLUE (NOT REQUIRED FOR SINGLE STAGE)

IMPORTANT  USE CARE WHEN CUTTING LINKS TO PREVENT DAMAGE TO CONTROL. SEE FIGURE 21, CBX32MV JUMP AND LINK GUIDE FOR FURTHER DETAILS.

RED

BLACK

PURPLE

CUT ON−BOARD LINK Y1−Y2 FOR TWO−STAGE A/C ONLY

CUT ON−BOARD LINK R−DS WHEN DEHUMIDIFICATION

CBX32MV

and Second−Stage Outdoor

COMFORTSENSEt 7000 THERMOSTAT

OUTDOOR

SENSOR

(X2658)

CUT ON−BOARD LINK R −O.

TERMINAL IS USED.

HARMONY

Y1−Y2

2−STAGE

COMPR

R−O

HEAT

PUMP

R−DS

DEHUM

CUT FOR OPTION

Figure 20. Control (Field Wiring)  Heat Pump Application (Humiditrol

Outdoor Fan Relay Wiring) Non−Communicating

Page 18

and Second−Stage

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.

S Minimum temperature: −40ºF (−40ºC) S Maximum temperature: 70ºF (158ºC)

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

R 24VAC

Thermostat

Outdoor Unit

Link

i+ RSbus data high connection

i− RSbus data low connection

C 24VAC command (ground)

R 24VAC

i+ RSbus data high connection

i− RSbus data low connection

C 24VAC command (ground)

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).

Color−coded, temperature rating 95ºF (35ºC) minimum, solid core. (Class II Rated Wiring)

Table 8. Air Handler Control Connections 

Non−Communicating

Label Function

W1 First−stage heating demand.

Second stage heating demand. W1 input must be active to

recognize second stage heat demand. .

Third stage heating demand. W1 and W2 inputs must be

active to recognize third stage heat demand.

G 24VAC signal indicates the presence of a demand.

Y1 and

First and second stage cooling inputs.

C 24VAC common.

R 24VAC power.

DH Use in communicating system only

H 24VAC output for humidification.

L Use in communicating system only

Reversing Valve input. (Energized by thermostat in cooling

mode.)

Blower speed control input for Harmony Zoning or thermo-

stat de−humidification control.

Blower speed control input for Harmony Zoning or thermo-

stat de−humidification control.

Table 9. Run Length  Non−Communicating

Wire Run Length AWG # Insulation/Core Types

Less than 100’ (30m) 18

More than 100’ (30m) 16

Color−coded, temperature rating 95ºF (35ºC) minimum, solid core. (Class II Rated Wiring)

Page 19

CBX32MV SERIES

CBX32MV / CBX40UHV JUMPER & LINK GUIDE

COOLING MODE BLOWER SPEED

(COOLING & HP MODE)

HIGH

SPEED

MEDIUM−HIGH

SPEED

MEDIUM−LOW

SPEED

LOW

SPEED

HEATING MODE

BLOWER SPEED

(ELECTRIC HT MODE)

HIGH

SPEED

MEDIUM−HIGH

SPEED

MEDIUM−LOW

SPEED

LOW

SPEED

PUSH

BUTTON

2−STAGE

ON−BOARD LINK

OPTION SELECTION

(JUMPERS Y1 to Y2)

COMPRESSOR LINK

HEAT PUMP LINK

(JUMPERS R to O)

HARMONY LINK

(JUMPERS R to DS)

DEHUMIDIFICATION−

1−STG COMPRESSOR

DO NOT CUT

Y1−Y2

COMPR

2 STAGE

A/C UNIT HEAT PUMP UNIT

DO NOT CUT

R−0

HEAT

PUMP

NO HARMONY ZONING

OR NO

COMFORTSENSE 7000

W/ DS CONNECTION

DO NOT CUT

2−STG COMPRESSOR

R−DS

DEHUM

HARMONY

CUT LINK

Y1−Y2

COMPR

2 STAGE

CUT LINK

R−0

HARMONY ZONING

C0MFORTSENSE 7000

W/ DS CONNECTION

CUT LINK

HEAT

PUMP

R−DS

DEHUM

HARMONY

FUSE 3 AMP

XFMR 24V

24 VAC

COM

XFMR LINE

L2 L1

EARTH

INDOOR BLOWER SIGNAL

456

12 3

BLOWER

ADJUST SELECTION

NORMAL

NORM

−

(+ 10%)

SETTING

NORM

−

(−10%)

SETTING

NORM

−

HEAT

1234

COOL

1234

DELAY

I + I −

LINK

1234

ADJUST

NORM + −

I + I −RC

OUTDOOR UNIT

L1L2

INDOOR BLOWER POWER

7−SEGMENT LED

COOLING BLOWER RAMPING

(COOLING MODE UNLESS NOTED)

DELAY

PROFILE #4

OFF−50%−82%−

100%−50%−OFF

DELAY

PROFILE #3

OFF−82%−100%−OFF

DELAY

PROFILE #2

COOLING

OFF−100%−100%−OFF

OFF−30sOFF−100%−100% OFF

DELAY

PROFILE #1

OFF−100%−OFF

HUMIDITROL

HUMIDIFICATION

SMART AUTO

EVENHEAT

BLOWER

ONLY CFM

1234

I + I −RC

THERMOSTAT

2−STAGE

COMPR

R−DS

R−O

HARMONY

Y1−Y2

DEHUM

HEAT

PUMP

−CUT ON−BOARD LINK (SOLDER TRACE) COMPLETELY

THROUGH BOTH LAYERS ON THE CONTROL BOARD

IMPORTANT: USE CARE WHEN CUTTING LINKS TO PREVENT DAMAGE TO CONTROL.

HUMIDIFICATION MODE

115

100

130

STANDARD HEAT MODE

(DEFAULT)

STANDARD

HEAT MODE

(STAGED BY TSTAT)

110

115

FACTORY

OUTDOOR

DISCHARGE

AIR SENSOR

CONTINUOUS FAN

BLOWER SPEED

HIGH

SPEED

(100%)

MEDIUM−HIGH

SPEED

(70%)

MEDIUM−LOW

SPEED

(38%)

LOW

SPEED

(28%)

JUMPER

EVENHEATER

−ENABLED WITH OPTIONAL DISCHARGE AIR SENSOR

DEGREE TARGET

DISCHARGE

TEMPERATURE

DEGREE

TARGET

DEGREE

TARGET

DEGREE

TARGET



MODE

110

115

100

110

115

130

115

110

115

130

110

115

130

FACTORY DEFAULT SETTING

HUMIDIFICATION MODE

24VAC OUTPUT ON ”H”

ACCESSORY INTERLOCK

SMART MODE

− ”H” ENABLED WHEN HEAT ACTIVE

(HP or ELECT. HT)

130

AUTO MODE

− ”H” ENABLED WHEN

BLOWER ACTIVE

& NO CLG OR DEHUM

130

FOR HUMIDIFIER OR

SMART

AUTO

Figure 21. Air Handler Configuration

Page 20

Air Handler Control Button, Display and

Jumpers

Use figure 21 as reference for jumper settings. If any of the reference 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 21)

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:

S If jumper is installed in SMART Humidification

position (Default), H terminal is active if heat demand is present and indoor blower is running.

S 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.

Page 21

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 25.

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 25.

6. Adjust − Used to select the indoor blower CFM

adjustment value by placing the jumper in appropriate position.

S If NORM is selected, indoor blower runs at

normal speeds.

S If + is selected, indoor blower runs at

approximately 10% higher speed than NORM setting.

S 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 21 for jumper configurations. Actual CFM values for different air handler sizes are shown in Targeted CFM tables starting on page 25.

7. Delay  Indoor blower cooling profile, delay for

cooling and heat pump operations.

S When operating a heat pump, delay profiles 1

and 2 are only applicable.

S When operating a heat pump, and profiles 3

and 4 are selected, the Air Handler Control will default to profile 1.

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 21 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.

100%

Cooling  Air Conditioner and Heat Pump:

OFF

A When cool demand is initiated, motor ramps up to

100% and runs at 100% until demand is satisfied.

CFM

COOLING DEMAND

Delay Profile 2

100% CFM

COOLING DEMAND

OFFOFF

100% CFM

45 SEC.

CBX32MV SERIES

B Once demand is met, motor runs at 100% for 45

seconds.

C Motor ramps down to stop.

Heating  Heat Pump only:

OFF

30 sec

delay

100% CFM

HEATING DEMAND

100% CFM

45 SEC.

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

OFF

7 1/2 MIN

82%CFM

COOLING DEMAND

100% CFM

A When cool demand is initiated, motor ramps up to

82%

Table 10. AHC System Status Codes

OFF

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

OFF

1/2 MIN 50% CFM

7 1/2 MIN 82% CFM

COOLING DEMAND

100%

CFM

1/2 MIN 50% CFM

OFF

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 21 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.

AHC Single Character

Display

Letter or Number







 







Action

Unit Size Code displayed represents air handler model size and capacity. See Configuring Unit Size Codes in figure

23.

If three horizontal bars are displayed, AHC does not recognize air handler model size and capacity. See Configuring

Unit Size Codes in Figure 23.

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/ Repeat codes. Example:  or 

Discharge air sensor temperature (indoor blower must be operating) 

Page 22

Table 11. AHC Configuration, Test and Error Recall (Fault and Lockout) Function

NOTE  AHC MUST BE IN IDLE MODE)

Single Character LED

Display

Solid

Blinking



Action

Push and hold button until solid appears, release button. Display will blink.

Push and hold button until required symbol displays.   or 

CONFIGURING ELECTRIC HEAT SECTIONS

Release push button − control will cycle the indoor blower motor on to the selected heat speed and stage the electric

Solid



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

Solid

Blinking



Action

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.

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

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.

current active mode. LED display will go blank and then

ERROR CODE RECALL MODE (NOTE  CONTROL MUST BE IN IDLE MODE)

Solid

Blinking





 



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.

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

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. Display will blink.

Push button to confirm command to delete codes. Error codes are cleared.

Page 23

CBX32MV SERIES

Table 12. AHC Single Character Display Alert Codes (Communicating and Non−Communicating)

Alert Code

     

 

 

         

 

           

 

       

 

           

Error codes 401 through 409 are only displayed when the Control’s L terminal is connected to a non−communicating outdoor unit’s LSOM device..

                 

** Cutback Mode  The variable speed motor has pre−set speed and torque limiters to protect the motor from damage caused by operating out of its designed parameters (0 through 0.80 in. w.g. total external static pressure).

Status of Air Handler

Device communications problem − No other devices on BUS (Communication system).

No 60 hertz power (Check voltage and frequency)

Low 24 volts (18 or less volts) − Control will restart if the error recovers.

Unresponsive Device2 − Indicates a device on the RSbus is not responding to a message sent to it by another device. Error code is applicable to all communicating devices on the RSbus (thermostat, indoor and outdoor units). Normally indicates a malfunctioning device.

Active Subnet Controller Missing for > 180 seconds. This indicates a data connection has been lost between a communicating device and the communicating thermostat. Device (indoor or outdoor unit) sends the alarm if no communication is established between device and thermostat within three minutes.

Configuration jumper(s) is missing on AHC.

Non−volatile data corruption.

Failed Flash CRC check.

Outdoor air temperature sensor (OAS) out of range.

Indoor Blower communication failure − (includes indoor blower power outage)

Incorrect air handler model size and capacity selected or wrong motor. Check for proper configuring under Configuring Unit Size Codes.

No air handler model size and capacity selected. Check for proper configuring under Configuring Unit Size Codes.

Indoor blower motor unable to start (seized bearing, stuck wheel, etc.).

Indoor blower motor over temperature (motor trip on internal protector)

Discharge air temperature sensor (DATS) out of range.

Restricted airflow  Indoor blower motor is running at a reduced CFM (cutback mode **)

Indoor and outdoor unit capacity mismatch.

Global network connection error. This usually indicates there is a short or overladed resistance is to low) condition between communicating indoor and thermostat units.

Jumper for second−stage cooling not removed.

Jumper for heat pump operation not removed.

Relay Y1 failure.

Relay Y2 failure.

Heat call with non−configured or mis−configured electric heat. Check for proper configuring under Configuring Electric Heat Stages.

Heat section / Stage 1 failed (Pilot relay contacts did not close or the relay coil in electric heat did not energizing)

Heat section / Stage 2 failed.

Heat section / Stage 3 failed.

Heat section / Stage 4 failed.

Heat section / Stage 5 failed.

Defrost out−of−control

Compressor ran more than 18 hours in air conditioning mode.

Compressor system pressure trip.

Compressor short−cycling − running less than four minutes.

Compressor rotor locked.

Compressor open circuit.

Compressor open start circuit.

Compressor open run circuit.

Compressor contactor is welded.

Compressor low voltage.

Page 24

Target CFM Tables

CBX32MV-018/024 BLOWER PERFORMANCE  0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range

ADJUST

Jumper

Setting

+ 715 337 855 405 1000 470 1130 535 465 220 690 325 900 425 1050 495

NORM 670 315 770 365 900 425 1035 490 425 200 620 290 825 390 950 450

− 580 275 700 330 800 375 930 440 385 180 560 265 735 345 850 400

1 2 3 4 1 2 3 4

cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s

HEAT Speed COOL Speed

CBX32MV-024/030 BLOWER PERFORMANCE  0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range

ADJUST

Jumper

Setting

+ 800 380 935 440 1070 505 1210 570 660 310 880 415 1100 520 1320 625

NORM 725 340 850 400 975 460 1100 520 600 285 800 380 1000 470 1200 565

− 655 310 765 360 880 415 990 470 540 255 720 340 900 425 1080 510

1 2 3 4 1 2 3 4

cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s

HEAT Speed COOL Speed

CBX32MV-036 BLOWER PERFORMANCE  0 through 0.80 in. w.g. (0 through 200 Pa) External Static Pressure Range

ADJUST

Jumper

Setting

+ 1230 580 1335 630 1445 680 1545 730 1090 515 1225 580 1380 650 1545 730

1 2 3 4 1 2 3 4

cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s

HEAT Speed COOL Speed

Jumper Speed Positions

NORM 1120 530 1215 575 1315 620 1400 660 975 460 1125 530 1275 600 1400 660

− 1010 475 1185 560 1200 565 1265 595 900 425 1000 470 1135 535 1265 595

CBX32MV-048 AND CBX32MV-060 BLOWER PERFORMANCE  0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range

Jumper Speed Positions

ADJUST

Jumper

Setting

+ 1850 875 1960 925 2090 985 2150 1015 1625 765 1820 860 2055 970 2145 1010

NORM 1705 805 1800 850 1900 895 2005 945 1425 670 1625 765 1805 850 2005 945

− 1560 735 1625 765 1720 810 1770 835 1205 570 1375 650 1555 735 1725 815

1 2 3 4 1 2 3 4

cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s

HEAT Speed COOL Speed

CBX32MV-068 BLOWER PERFORMANCE  0 through 0.80 in. w.g. (0 Through 200 Pa) External Static Pressure Range

Jumper Speed Positions

HEAT Speed COOL Speed

ADJUST

Jumper Setting

+ 1875 885 1975 930 2090 985 2150 1015 1640 775 1840 870 2075 980 2150 1015

NORM 1760 830 1825 860 1920 905 2030 960 1465 690 1625 765 1800 850 2000 945

− 1550 730 1650 780 1725 815 1800 850 1250 590 1390 655 1560 735 1720 810

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 setting. Continuous blower speed is approximately 50% of COOL speed setting. Lennox Harmony IIIt Zone Control applications − minimum blower speed is 300 cfm (145 L/s)

1 2 3 4 1 2 3 4

cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s cfm L/s

Page 25

CBX32MV SERIES

Unit Operating Sequences

This section details unit operating sequence for non−communicating systems. NOTE − For communicating systems, see the icomfort Toucht thermostat installation instruction.

Table 13. CBX32MV with ComfortSenset 7000 Thermostat and Single−Stage Outdoor Unit Operating

Sequence

Operating Sequence System Demand System Response

System

Condition

Normal Operation 1 On On On Acceptable 24 VAC High 100%

Dehumidification Call

Normal Operation 1 On On On Acceptable 24 VAC High 100%

Dehumidification call

Dehumidification call ONLY

Step

2 On On On Demand 0 VAC High 70%

1 On On On Demand 0 VAC High 70%

Thermostat Demand Relative Humidity

Comp

Y1 Y2 O G W1 W2 Status D

NO CALL FOR DEHUMIDIFICATION

BASIC MODE (Only active on a Y1 thermostat demand)

PRECISION MODE (Operates independent of a Y1 thermostat demand)

Air

Handler

CFM

(COOL)

Compressor and indoor air handler follow thermostat demand

ComfortSenset 7000 thermostat energizes Y1 and de−energizes D on a call for dehumidification.

NOTE − No over cooling.

Dehumidification mode begins when humidity is greater than set point

ComfortSenset 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.

Comments

Page 26

Table 14. CBX32MV with ComfortSenset 7000 Thermostat and Two-Stage Outdoor Unit Operating Sequence

Operating Sequence System Demand System Response

Thermostat Demand Relative Humidity

System Condition

Step

Y1 Y2 O G W1 W2 Status D

Compre

ssor

No Call for Dehumidification

Normal Operation

− Y1

Normal Operation

− Y2

1 On On On Acceptable 24 VAC Low 70%

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%

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 call

Dehumidification call ONLY

2 On On On On Demand 0 VAC High 70%

1 On On On On Demand 0 VAC High 70%

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%

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 call

Dehumidification call ONLY

2 On On On On Demand 0 VAC High 70%

1 On On On On Demand 0 VAC High 70%

Air

Handler

CFM

(COOL)

Comments

Compressor and indoor air handler follow thermostat demand

ComfortSenset 7000 ther- mostat energizes Y2 and de− energizes D on a call for dehumidification

NOTE − No over cooling.

Dehumidification mode begins when humidity is greater than set point

ComfortSenset 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.

ComfortSenset 7000 ther- mostat energizes Y2 and de− energizes D on a call for dehumidification

NOTE  No over cooling.

Dehumidification mode begins when humidity is greater than set point

ComfortSenset 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 27

CBX32MV SERIES

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).

Finished

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

Refer to Heat Pump or Cooling Sequence of Operation flow diagrams, Air Handler or ECB40 Electric Heat installation instructions.

Electric

heat

Installed?

Ye s

W1 Call?

Ye s

Ye sNo

Standard

AHC

recognizes

Unit Size

Code?

Which Heat

Mode?



No (Display Alarm

Code 203)

Refer to Configuring Unit Size Codes flow diagram, Air Handler or ECB40 Electric Heat installation instructions.

IMPORTANT  Field replacement controls may need to be manually configured to validate air handler unit size code.

EVENHEAT

Refer to EVENHEAT Operation flow diagram, Air Handler or ECB40 Electric Heat installation instructions.

NUMBER OF HEAT SECTIONS DETECTED

T−STAT CALL

RECOMMEND  USE FIGURE 21 AS A REFERENCE FOR SETTING JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.

ONE (H1)

TWO (H1−H2)

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.)

Indoor blower will immediately start to delivery CFM as set by heating mode jumper on AHC with activation of first electric heat pilot relay.

THREE (H1−H3)

FOUR (H1−H4)

H1 AND H2

FIVE (H1−H5)

H1 AND H2

H3 AND H4

Pilot relays on AHC are energized one at a time. There is a minimum of 10 seconds delay between pilot relay activations.

NOTE − AHC will not recognize higher heat sections calls if lower heat section is not present.

At the completion of each heat section demand (W1, W2, and W3), the AHC will immediately de−energize the corresponding pilot relay(s).

NOTE  If the call for lower heat section is removed, AHC will automatically de−energize higher heat sections.

At the completion of all heating demands, the indoor blower will run for an additional 10 seconds before de−energizing.

Figure 22. Air Handler Control Checkout

Page 28

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.

To enter unit size code

configuration mode; PUSH and

HOLD button next to single

character LED display until dash

symbol appears, RELEASE button.

Solid dash starts blinking

on single character LED

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

display.

and capacity.

Ye s



(No heating, cooling or indoor fan operation)

AHC in IDLE mode





UNIT SIZE

CODE



Turn room thermostat to

OFF

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

IMPORTANT  Field replacement controls may need to be manually configured to validate air handler unit size code.

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.



Figure 23. Configure Unit Size Codes

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 ative 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.

YES

Unit enters IDLE

Mode.

Page 29

CBX32MV SERIES

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.

NOTE  All field replacement AHC will require configuring/detecting electric heat sections.

RECOMMEND  USE FIGURE 21 AS A REFERENCE FOR SETTING

JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.

Standard EVENHEAT

Which Heat

Mode?

S Set desired Heating Mode Blower Speed jumper

pin.

S Electric heat is stages by room thermostat. (AHC

comes with factory jumper between W1 to W2 and W2 to W3)

S Refer to Air Handler Control Checkout flow diagram for

operation.

Ye s

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.

Solid dash starts blinking on single character LED display



S Set desired Heating Mode Blower Speed jumper

pin.

Configuration

AHC in Idle Mode

(No heating cooling or

indoor fan operation)

Push and hold button until the solid H symbol is displayed on the single character LED display, then release button.

S Install and wire discharge air temperature sensor.

S 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 130ºF) .

S Refer to EVENHEAT Operation flow diagram for

operation.

Turn room thermostat to OFF.



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,

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,

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.

AHC will show a 1 on the single character LED display indicating that the first stage has been detected. As

the AHC will exit the current active mode and resume operation with electric heat disabled.

Finished

Figure 24. Heat Mode Selection

Page 30

INPUTS OUTPUTS

Room Thermostat Demand

Target Discharge Air Temperature Set at 85ºF

Y1 Heat Pump First Stage Heat Pump First Stage

Y1 + Y2

Y1 + W1 and/or W2

Heat Pump First and Second Stage

Heat Pump First Stage + First Electric Heat Section (H1)

Heat Pump First and Second

Y1 and Y2 + W1 and/or W2

Stage+ First Electric Heat Section (H1)

W1 and/or W2 First Electric Heat Section (H1)

EVENHEAT OPERATION

Target Discharge Air Temperature Set at 100ºF

Heat Pump First and Second Stage + First Electric Heat Section (H1)

Heat Pump First 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 + Second Electric Heat Section (H2) if number of electric heater sections detected is more than two.

First Electric Heat Section (H1) + Second Electric Heat Section (H2) if number of electric heater sections detected is more than two.

Target Discharge Air Temperature Set at 115ºF/130ºF

Heat Pump First + First Electric Heat Section (H1)

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.

Heat Pump First Stage + First Electric Heat Section (H1) 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.

First Electric Heat Section (H1) + Second Electric Heat Section (H2) if number of electric heater sections 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.

Ye s

Last room thermostat Heat

Timer delays for

120 seconds

Heat Pump and electric heat

demand?

One Stage More than one stage

Increase target discharge air temperature by 15Fº

up− staging action

Timer delays for 150

seconds

Figure 25. EVENHEAT Operation (1 of 2)

Page 31

CBX32MV SERIES

Note 1 Activation delay

S 120 seconds if one heat stage is or deactivated

S 150 seconds if more than one stage is activated or deacti-

vated.

EVENHEAT Operation

Start Timer Delay

(Note 1)

Ye s

Adjust Target Discharge Air

Temperature

Delay Timer

Finished or last

change was up−

stage

Ye s

Electric heat ON

Ye s

W call with one

Electric Heat

Section ON

Above

Change in Heat

demand from

room thermostat?

Stop Delay Timer

Increase heat demand.

Y1 (with or without Y2) +

W1 and W2

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 15ºF for W2 demand.

Heat Pump ON

Discharge air temperature sensor setting on Air Handler Control will remain at set point. W1 demand will increase set point 15ºF. W2 demand will increase set point an additional 15ºF. (Total of 30ºF)

Below

Activate Y2

Delay Timer

Finished or last

change was

down−

stage

Ye s

Y1 ON and

Y2 OFF

More Electric

Heat

available

Ye s

Adjust Target

Discharge Air

Temperature

Turn OFF Electric

Heat Section

Figure 26. EVENHEAT Operation (2 of 2)

Discharge air

temperature is

within target range?

Measured discharge air

temperature is above or

below

target range?

Page 32

Turn ON one

Electric Heat

section

NOTE  Optional Outdoor Thermostat (Wired between R and W3) will lockout electric elements 3, 4 and 5.

Heat Pump Operation (Heating and 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

4. Simultaneous Heat Pump and electric heat call: Indoor Blower will operate at the highest CFM requested by

Single or Two−Stage Unit

1. AHC on−AHC link must be cut between Y1 and Y2 to allow two stage cooling operation.

2. AHC on−AHC link must be cut between R and O to allow heat pump operation.

RECOMMEND  USE FIGURE 21 AS A REFERENCE FOR SETTING

second indoor blower OFF delay)

the heat pump or the electric heat blower speed selection.

JUMPER CONFIGURATIONS ON THE AIR HANDLER CONTROL.

CUT ON−BOARD LINK Y1−Y2 FOR TWO−STAGE A/C

CUT ON−BOARD LINK R −O.

IMPORTANT  USE CARE WHEN CUTTING LINKS TO

PREVENT DAMAGE TO CONTROL. SEE FIGURE 21,

CBX32MV JUMP AND LINK GUIDE FOR FURTHER

DETAILS.

Y1−Y2

2−STAGE

COMPR

R−O

HEAT

PUMP

R−DS

DEHUM

HARMONY

CUT FOR OPTION

Heating

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.

NOTE  The outdoor unit control directly controls the outdoor unit operation.

Y1 input to the AHC will control the indoor blower according to the cooling or heating mode blower speed adjust selection jumper pins.

Room thermostat calls for

second stage?

Ye s

, ramping and

Ye s

Room thermostat

calls for first

stage?

Cooling

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.

NOTE  The outdoor unit control directly controls the outdoor unit operation.)

Y1 input to the AHC. Will control the indoor blower according to the cooling mode blower speed selection jumper pins.

, ramping and adjust

Ye s

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.)

Ye s

Y2 terminal on AHC is configured as input and passes signal from room thermostat to outdoor unit.

NOTE  The outdoor unit control directly controls the outdoor unit operation.)

Still calling for second

Y2 terminal is an input to the AHC. The indoor blower will be controlled according to the jumper pin selections.

stage?

Ye s

Page 33

Still calling for first

stage?

De−energize Y1 (and O in cooling) terminals on AHC.

NOTE  The outdoor unit control directly controls the outdoor unit operation.

De−energize indoor blower per ramping profile.

CBX32MV SERIES

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

AHC on−board link must be cut between Y1 and Y2 to allow 2 stage 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.

NOTE − The outdoor unit control directly controls the outdoor unit operation.

CUT ON−BOARD LINK Y1−Y2 FOR TWO−STAGE A/C

RECOMMEND  USE FIGURE 21 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 21, CBX32MV jump and link guide for further details.

Y1−Y2

2−STAGE

COMPR

R−O

HEAT

PUMP

R−DS

DEHUM

HARMONY

CUT FOR OPTION

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?

Ye sYe s

Y2 terminal on AHC is configured as input and passes signal from room thermostat to outdoor unit.

NOTE − The outdoor unit control directly controls the outdoor unit operation.

Y2 terminal is an input to the AHC. The indoor blower will be controlled according to the jumper pin selections.

Ye s

Still calling for second

stage?

Ye s

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.

Still calling for first

stage?

De−energize Y1 (and O in cooling) terminal on AHC.

NOTE − The outdoor unit control directly controls the outdoor unit operation.

De−energize indoor blower per ramping

profile.

Ye s

Page 34

Error Code / Recall Mode

Ye s No

To enter Error Code Mode, push and hold button next to single character LED display until solid E symbol appears, release button.

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.

NOTE  Error Codes are not cleared from memory.



AHC in Idle Mode

(No heating cooling or indoor

fan operation)

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.

Turn room thermostat to OFF

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.

   

NOTE  Once the error code history is deleted, it cannot be recovered.

Page 35

CBX32MV SERIES

Indoor Blower Test

To indoor blower test mode, push and hold button next to single character LED display until  (Solid bar), then release button.

(Solid bar) starts blinking .

Indoor Blower Test Mode

AHC in Idle Mode

Ye s

(No heating cooling or indoor

fan operation)



Turn room thermostat to

Push and hold button until the



solid A symbol is displayed on the single character LED display, then release button.

OFF



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.

Checkout Procedures

NOTE − Refer to outdoor unit installation instructions for system start−up instructions and refrigerant charging instructions.

PRE-START-UP CHECKS

S Is the air handler properly and securely installed? S If horizontally configured, is the unit sloped up to 1/4

inch toward drain lines?

S Will the unit be accessible for servicing? S 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?

S Have ALL unused drain pan ports been properly

plugged?

S Has the condensate line been properly sized, run,

trapped, pitched, and tested?

S Is the duct system correctly sized, run, sealed, and

insulated?

S Have all cabinet openings and wiring been sealed? S Is the indoor coil factory-installed TXV properly sized

for the outdoor unit being used?

S Have all unused parts and packaging been disposed

of?

S Is the filter clean, in place, and of adequate size? S Is the wiring neat, correct, and in accordance with the

wiring diagram?

S Is the unit properly grounded and protected (fused)? S Is the thermostat correctly wired and in a good

location?

S Are all access panels in place and secure?

CHECK BLOWER OPERATION

S Set thermostat to FAN ON. S The indoor blower should come on.

CHECK COOLING OPERATION

S Set thermostat to force a call for cooling

(approximately 5ºF lower than the indoor ambient temperature).

Page 36

S The outdoor unit should come on immediately and the

indoor blower should start between 30 − 60 seconds later.

S Check the airflow from a register to confirm that the

system is moving cooled air.

S Set the thermostat 5ºF higher than the indoor

temperature. The indoor blower and outdoor unit should cycle off.

CHECK ELECTRIC HEATER (IF USED)

S Set thermostat to call for auxiliary heat (approximately

5°F 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.

S Set the thermostat so that it does not call for heat.

Allow up to 5 minutes for all sequencers to cycle off.

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 first-stage 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.

Maintenance

DEALER

Operation

COOLING (COOLING ONLY OR HEAT PUMP)

When the thermostat calls for cooling, 24 volts is put on 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 time-delay, 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 put on 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.

If the room temperature should continue to fall, the circuit between R and W1 is completed by the second-stage heat room thermostat. Circuit R−W1 energizes a heat sequencer. The completed circuit will energize supplemental electric heat (if applicable). Units with a

WARNING

Electric shock hazard. Can cause injury or death. Before attempting to perform any service or maintenance, turn the electrical power to unit OFF at disconnect switch(es). Unit may have multiple power supplies.

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.

Maintenance and service must be performed by a qualified installer or service agency. At the beginning of each cooling season, the system should be checked as follows:

Outdoor Unit

1. Outdoor unit fan motor is pre−lubricated and sealed. No further lubrication is needed.

2. Visually inspect all connecting lines, joints and coils for evidence of oil leaks.

3. Check all wiring for loose connections.

4. Check for correct voltage at unit (unit operating).

5. Check amp draw on outdoor fan motor. Motor Nameplate:_________ Actual:__________.

6. Inspect drain holes in coil compartment base and clean if necessary.

NOTE - If insufficient cooling occurs, the unit should be gauged and refrigerant charge should be checked.

Outdoor Coil

Clean and inspect outdoor coil (may be flushed with a water hose). Ensure power is off before cleaning.

NOTE  It may be necessary to flush the outdoor coil more frequently if it is exposed to substances which are corrosive or which block airflow across the coil (e.g., pet urine, cottonwood seeds, fertilizers, fluids that may contain high levels of corrosive chemicals such as salts)

Page 37

CBX32MV SERIES

Sea Coast  Moist air in ocean locations can carry salt, which is corrosive to most metal. Units that are located near the ocean require frequent inspections and maintenance. These inspections will determine the necessary need to wash the unit including the outdoor coil. Consult your installing contractor for proper intervals/procedures for your geographic area or service contract.

Indoor Unit

1. Clean or change filters.

2. Lennox blower motors are prelubricated and permanently sealed. No more lubrication is needed.

3. Adjust blower speed for cooling. Measure the pressure drop over the coil to determine the correct blower CFM. Refer to the unit information service manual for pressure drop tables and procedure.

4. Belt Drive Blowers − Check belt for wear and proper tension.

5. Check all wiring for loose connections.

6. Check for correct voltage at unit. (blower operating)

7. Check amp draw on blower motor.

Motor Nameplate:_________ Actual:__________.

Indoor Coil

1. Clean coil if necessary.

2. Check connecting lines, joints and coil for evidence of oil leaks.

3. Check condensate line and clean if necessary.

Cabinet Insulation

IMPORTANT

DAMAGED INSULATION MUST BE REPAIRED OR REPLACED before the unit is put back into operation. Insulation 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 foil-faced insulation, any cut, tear, or separations in the insulation surface must be taped with a similar foil−faced tape.

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.

1. CUT INSULATION IN X PATTERN

2. APPLY GLUE

3. PRESS GLUED TABS AGAINST CABINET

Figure 27. Repairing Insulation

WARNING

Electric Shock Hazard.

Can cause injury or death.

HOMEOWNER

Cleaning of the outdoor unit’s coil should be performed by a trained service technician. Contact your dealer and set up a schedule (preferably twice a year, but at least once a year) to inspect and service your outdoor unit. The following maintenance may be performed by the homeowner.

Page 38

CAUTION

IMPORTANT

Sprinklers and soaker hoses should not be installed where they could cause prolonged exposure to the outdoor unit by treated water. Prolonged exposure of the unit to treated water (i.e., sprinkler systems, soakers, waste water, etc.) will corrode the surface of steel and aluminum parts and diminish performance and longevity of the unit.

Outdoor Coil

The outdoor unit must be properly maintained to ensure its proper operation.

S Please contact your dealer to schedule proper

inspection and maintenance for your equipment.

S Make sure no obstructions restrict airflow to the

outdoor unit.

S Grass clippings, leaves, or shrubs crowding the unit

can cause the unit to work harder and use more energy.

S Keep shrubbery trimmed away from the unit and

periodically check for debris which collects around the unit.

Routine Maintenance

In order to ensure peak performance, your system must be properly maintained. Clogged filters and blocked airflow prevent your unit from operating at its most efficient level.

1. Air Filter  Ask your Lennox dealer to show you

where your indoor unit’s filter is located. It will be either at the indoor unit (installed internal or external to the cabinet) or behind a return air grille in the wall or ceiling. Check the filter monthly and clean or replace it as needed.

2. Disposable Filter  Disposable filters should be

replaced with a filter of the same type and size.

NOTE

 If you are unsure about the filter required for your

system, call your Lennox dealer for assistance.

3. Reusable Filter  Many indoor units are equipped

with reusable foam filters. Clean foam filters with a mild soap and water solution; rinse thoroughly; allow filter to dry completely before returning it to the unit or grille.

NOTE any time the unit is in operation.

 The filter and all access panels must be in place

4. Electronic Air Cleaner  Some systems are

equipped with an electronic air cleaner, designed to remove airborne particles from the air passing through the cleaner. If your system is so equipped, ask your dealer for maintenance instructions.

5. Indoor Unit  The indoor unit’s evaporator coil is

equipped with a drain pan to collect condensate formed as your system removes humidity from the inside air. Have your dealer show you the location of the drain line and how to check for obstructions. (This would also apply to an auxiliary drain, if installed.)

Thermostat Operation

See the ComfortSense® 7000 or icomfort Toucht thermostat homeowner manual for instructions on how to operate your thermostat.

Preservice Check

If your system fails to operate, check the following before calling for service:

S Verify room thermostat settings are correct. S Verify that all electrical disconnect switches are ON. S Check for any blown fuses or tripped circuit breakers. S Verify unit access panels are in place. S Verify air filter is clean. S If service is needed, locate and write down the unit

model number and have it handy before calling.

Accessories

For update−to−date information, see any of the following publications:

S Lennox CBX32MV Engineering Handbook S Lennox Product Catalog S Lennox Price Book

Page 39

CBX32MV SERIES

Lennox CBX32MV, variable speed air handlers cbx32mv Installation Instructions Manual

Specifications and Main Features

Frequently Asked Questions

User Manual