Lennox Variable Speed Air Handlers CBX32MV User manual

06/11 506274−01
*2P0611* *P506274-01*
Page 1
E2011 Lennox Industries Inc.
Dallas, Texas, USA
NOTICE
A thermostat is not included and must be ordered
separately.
DThe Lennox icomfort Touch thermostat must be used
in communicating applications.
DIn non−communicating applications, the Lennox
ComfortSense®7000 thermostat may be used, as well
as other non−communicating thermostats.
In all cases, setup is critical to ensure proper system
operation.
Field wiring for both communicating and non−
communicating applications is illustrated in diagrams,
which begin on page 13.
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)
INSTALLATION
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. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
IMPORTANT INFORMATION TO INSTALLER
AB
D
C
TOP CAP SHIPPING BRACKET (REPLACE
SCREWS IN TOP CAP AFTER REMOVAL).
HORIZONTAL DRAIN PAN (SEE
UPFLOW APPLICATIONS ON PAGE
5 AND DOWNFLOW APPLICATIONS
ON PAGE 8 )
BLOWER HOUSING SUPPORT PAD.
REFRIGERANT LINE PLUGS (SEE BRAZING CONNECTION
ON PAGE 9] .
CHECK FOR AND REMOVE THE FOLLOWING ITEMS BEFORE OPERATING UNIT.
FOR PROPER OPERATION THE ELECTRIC HEAT (IF APPLICABLE) MUST BE
CONFIGURED (SET−UP) THROUGH THE AIR HANDLER CONTROL (AHC)
WHENEVER ELECTRIC HEAT IS INSTALLED THE AHC MUST BE
MANUALLY CONFIGURED. SEE JUMPERS AND LINKS GUIDE ON
PAGE 20.
ELECTRIC HEAT SECTIONS MUST BE
CONFIGURED. IF INSTALLED SEE
PROCEDURE IN FIGURE 24 ON PAGE 30.
H
H
CONFIGURE ELECTRIC HEAT
ECB40
Litho U.S.A.

Page 2
Upflow and Downflow Unit Dimensions  Inches (millimeters)
OPTIONAL
ELECTRIC HEAT
(FIELD−INSTALLED)
AIR
FLOW
LIQUID
LINE
SUCTION
LINE
SUPPLY AIR
OPENING
RETURN AIR
FILTER
LOW VOLTAGE
INLETS (TOP AND
RIGHT SIDE)
RETURN AIR
TOP VIEW
FRONT VIEW SIDE VIEW
BLOWER
PIPING PLATE DETAIL
(FOR UPFLOW AND DOWNFLOW POSITIONS)
A
BC
11-1/16 (281)
D
FE
LIQUID LINE
SUCTION LINE
CONDENSATE DRAINS
(2) (HORIZONTAL)
COIL
3/4 (19)
3/4 (19)
5/8 (16)
5/8 (16) 1 (25)
5/8 (16)
1-3/4 (44)
2
(51)
1-1/8 (29) 4-3/8 (111)
2-3/4
(70)
5-3/8
(137)
3-1/2 (89)
OPTIONAL
ELECTRIC HEAT
(FIELD−INSTALLED) AIR FLOW
LIQUID
LINE
SUCTION
LINE
RETURN
AIR
OPENING
SUPPLY
AIR
FILTER
SUPPLY AIR
TOP VIEW
FRONT VIEW
SIDE VIEW
BLOWER
A
B
C
11-1/16 (281)
F
D
E
COIL
5/8 (16)
5/8 (16)
5/8 (16)
5/8 (16)
5/8 (16)
LOW VOLTAGE
(RIGHT SIDE)
LINE VOLTAGE
(LEFT SIDE)
DOWNFLOW POSITION
1 (25)
UPFLOW POSITION
CONDENSATE DRAINS
(2) (UPFLOW AND
DOWNFLOW)
FILTER ACCESS
FILTER ACCESS
H
G
H
G
LINE VOLTAGE
INLETS (TOP
AND LEFT SIDE)
5/8 (16)
5/8 (16)
KNOCKOUT FOR OPTIONAL HEALTHY
CLIMATE®GERMICIDAL UVC LIGHT. KNOCKOUT FOR OPTIONAL HEALTHY
CLIMATE®GERMICIDAL UVC LIGHT.
Model Dimensions (Upflow, Downflow, Left− and Right−Hand Horizontal applications)
Dim.
−018/024 −024/030 −036 −048 and −060 −068
in. (mm) in. (mm) in. (mm) in. (mm) in. (mm)
A45−1/4 (1149) 49−1/4 (1251) 51 (1295) 58-1/2 (1486) 65 (1651)
B16−1/4 (413) 21−1/4 (540) 21-1/4 (540) 21-1/4 (540) 21−1/4 (540)
C20−5/8 (524) 20−5/8 (524) 22-5/8 (575) 24-5/8 (625) 26−5/8 (676)
D14−3/4 (375) 19−3/4 (502) 19-3/4 (502) 19-3/4 (502) 19−3/4 (502)
E19 (483) 19 (483) 21 (533) 23 (584) 25 (635)
F15 (381) 20 (508) 20 (508) 20 (508) 20 (508)
G24−5/8 (625) 24−5/8 (625) 26-3/8 (670) 27-7/8 (708) 32−3/8 (822)
H20−5/8 (524) 24−5/8 (625) 24-5/8 (625) 30-5/8 (778) 32−5/8 (829)

Page 3
CBX32MV SERIES
Horizontal Left− and Right−Hand Unit Dimensions  Inches (mm)
LIQUID
LINE
SUCTION
LINE
SUPPLY
AIR
OPENING
FILTER
LOW VOLTAGE
INLETS (BOTTOM
AND RIGHT
SIDE)
TOP VIEW
FRONT VIEW
BLOWER
H
B
C
D
LIQUID
LINE
SUCTION
LINE
CONDENSATE
DRAINS (2)
(UPFLOW AND
DOWNFLOW)
CONDENSATE
DRAINS (2)
(HORIZONTAL)
COIL
3/4 (19)
3/4 (19)
1-1/2
(38)
1-3/4
(44)
5-3/4
(46)
2
(51)
1-1/8
(29)
RETURN AIR
OPENING
F
E
5/8 (16)
5/8 (16)
5/8 (16)
END VIEW
AIR
FLOW
OPTIONAL ELECTRIC
HEAT (FIELD−INSTALLED)
11-1/16
(281)
LINE VOLTAGE
INLETS (TOP
AND RIGHT
SIDE)
5-3/8
(137)
4-3/8
(111)
LIQUID
LINE
SUCTION
LINE
SUPPLY
AIR
OPENING
FILTER
LOW VOLTAGE
INLETS (TOP AND
LEFT SIDE)
END VIEW
BLOWER
B
C
D
COIL
3/4 (19)
3/4 (19)
3/4 (19)
RETURN
AIR OPENING
F
E
5/8 (16)
5/8 (16)
5/8 (16)
END VIEW
AIR
FLOW
OPTIONAL ELECTRIC
HEAT (FIELD INSTALLED)
LINE VOLTAGE INLETS
(BOTTOM AND LEFT SIDE)
Horizontal Position
(Right-Hand Air
Discharge)
FILTER ACCESS
FILTER ACCESS
5-3/4
(146)
1-1/2 (38)
1-3/4
(44)
CONDENSATE DRAINS (2)
(HORIZONTAL)
A
5/8 (16)
G
H
A
5/8 (16)
G
1 (25)
1 (25)
11-1/16
(281)
PIPING PLATE
DETAIL
LIQUID
LINE
SUCTION LINE
2
(51)
1-1/8
(29)
5-3/8
(137)
4-3/8
(111)
PIPING PLATE
DETAIL
Horizontal Position
(Left-Hand Air
Discharge)
TOP VIEW
FRONT VIEW
3/4 (19)
END VIEW
FOR DIMENSIONS A" THROUGH
H", SEE CHART ON PAGE 2.

Page 4
Model Number Identification
Refrigerant Type
X = R410A
230
CB 32 036−01
Series
Nominal Cooling Capacity
018/024 = 1.5 to 2 tons (5.3 to 7 kW)
024/030 = 2 to 2.5 tons (7 to 8.8 kW)
036 = 3 tons (10.6 kW)
048 = 4 tons (14.1 kW)
060 = 5 tons (17.6 kW)
Minor Revision Number
Configuration
MV = Multi−Position, Variable
speed blower motor
−X
Voltage
230 = 208/230V−60hz−1ph
−−6
Refrigerant Metering Device
2 = Fixed Orifice
3 = TXV − Bleed port (indoor unit)
4 = TXV − Non−bleed port (indoor unit)
5 = TXV − Non−bleed port (outdoor unit)
6 = TXV − R410A Non−bleed port (indoor
unit)
MV
Unit Type
CB = Air Handler
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.
Installation Clearances
Cabinet 0 inch (0 mm)
To Plenum 1 inch (25 mm)
To Outlet Duct within 3 feet (914
mm) 1 inch (25 mm)
Floor See Note #1
Service / Maintenance See Note #2
1Units installed on combustible floors in the down−flow position with
electric heat require optional down−flow additive base.
2 Front service access − 24 inches (610mm) minimum.
NOTE  If cabinet depth is more than 24 inches (610
mm), allow a minimum of the cabinet depth plus 2 inches
(51 mm).
IMPORTANT
The Clean Air Act of 1990 bans the intentional venting of
refrigerant (CFCs, HCFCs and HFCs) as of July 1, 1992.
Approved methods of recovery, recycling or reclaiming
must be followed. Fines and/or incarceration may be
levied for noncompliance.
WARNING
During blower operation, the ECM motor emits energy
that may interfere with pacemaker operation.
Interference is reduced by both the sheet metal cabinet
and distance.
CAUTION
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.
WARNING
Product contains fiberglass wool.
Disturbing the insulation in this product during installa-
tion, 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 infor-
mation, 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 5
CBX32MV SERIES
WARNING
Improper installation of the air handler can result in
personal injury or death.
Do not allow external combustion products or other
contaminants to enter the return air system or to be
mixed with air that will be supplied to the living space.
Use sheet metal screws and joint tape or duct mastic to
seal return air system to air handler. In platform
installations, the air handler should be sealed airtight to
the return air plenum. A door must never be used as a
portion of the return air duct system. The base must
provide a stable support and an airtight seal to the air
handler. Allow absolutely no sagging, cracks, gaps. etc.
For no reason should return and supply air duct systems
ever be connected to or from other heating devices such
as a fireplace or stove. etc. Fire, explosion, carbon
monoxide poisoning, personal injury and/or property
damage could result.
Requirements
In addition to conforming to manufacturer’s installation
instructions and local municipal building codes, installation
of Lennox air handler units (with or without optional electric
heat), MUST conform with the following National Fire
Protection Association (NFPA) standards:
SNFPA No. 90A  Standard for Installation of Air
Conditioning and Ventilation Systems
SNFPA No. 90B  Standard for Installation of
Residence Type Warm Air Heating and Air
Conditioning Systems
This unit is approved for installation clearance to
combustible material as stated on the unit rating plate.
Accessibility and service clearances must take
precedence over combustible material clearances.
Installing the Unit
CBX32MV units are factory−configured for upflow and
horizontal right−hand discharge installation. For downflow or
horizontal left−hand discharge, certain field modifications are
required.
DISASSEMBLE AND REASSEMBLE AIR HANDLER
UNIT
This unit consists of two sections which are shipped
assembled from the factory. If necessary, the unit may be
disassembled to facilitate setting the unit. Follow the steps
below:
To disassemble:
1. Remove access panels.
2. Remove both blower and coil assemblies. This will
lighten the cabinet for lifting.
3. Remove one screw from the left and right posts inside
the unit. Remove one screw from each side on the
back of the unit. Unit sections will now separate.
To reassemble:
1. Align cabinet sections together.
2. Reinstall screws.
3. Replace blower and coil assemblies.
4. Replace access panel.
UPFLOW APPLICATION
Use the following procedures to configure the unit for
upflow operations:
HORIZONTAL DRAIN
PAN (MUST BE
REMOVED)
UPFLOW/
DOWNFLOW
DRAIN PAN
Figure 1. Upflow Configuration
Note  (−068 model Only) Remove access panels and
the horizontal drip shield along with the corrugated padding
between the blower and coil assembly before operation.
Discard drip shields from the foam pads on top of the unit.
Shields are used for downflow applications only.
1. The horizontal drain pan must be removed when the
coil blower is installed in the upflow position. Removing
horizontal drain pain will allow proper 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:
SConnected to secondary drain pan
or
SConnected 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 6
NOTE  (−068 Model Only) Before operating the unit,
remove access panels and the horizontal drip shield and
the corrugated padding between the blower and coil
assembly. Discard the corrugated padding and the
downflow drip shields from the foam pads on top of the unit.
NOTE  (−068 Model Only) Install the horizontal shield on
the front edge of the horizontal drain pan as illustrated in
figure 2.
1. No further adjustment is necessary. Set unit so that it is
sloped 1/4 inch (6.35mm) towards the drain pan end of
the unit.
NO ADJUSTMENT IS NECESSARY
HORIZONTAL DRIP SHIELD (−068
MODELS)
UP−LOAD / DOWNFLOW
DRAIN PAN
HORIZONTAL DRAIN
PAN
DOWNFLOW RAIL
Figure 2. Right−Hand Discharge Configuration
2. If the unit is suspended, the entire length of the cabinet
must be supported. If you use a chain or strap, use a
piece of angle iron or sheet metal attached to the unit
(either above or below) to support the length of the
cabinet. Use securing screws no longer than 1/2 inch
(12.7mm) to avoid damaging the coil or filter as
illustrated in figure 3. Use sheet metal screws to
connect the return and supply air plenums as required.
HORIZONTAL RIGHT−HAND DISCHARGE
APPLICATION IN HIGH HUMIDITY AREAS
For horizontal applications in high humidity areas remove
the downflow rail closest to the drain pan.
To remove rail:
1. Remove the screws from the rail at the back of unit and
at the cabinet support rail.
2. Remove the downflow rail then replace screws.
3. Seal around the exiting drain pipe, liquid line, and
suction line to prevent humid air from infiltrating into
the unit.
IMPORTANT
When removing the coil, there is possible danger of
equipment damage and personal injury. Be careful when
removing the coil assembly from a unit installed in right−
or left−hand applications. The coil may tip into the drain
pan once it is clear of the cabinet. Support the coil when
removing it.
FRONT VIEW END VIEW
ANGLE IRON OR
SHEET METAL
ELECTRICAL INLET
CLEARANCE 4 IN. (102 MM)
1/2 IN. SCREWS MAXIMUM
Figure 3. Suspending Horizontal Unit
HORIZONTAL LEFT−HAND DISCHARGE
APPLICATION
Use the following procedures to configure the unit for
horizontal left−hand discharge operations:
NOTE  For horizontal applications, a secondary drain
pan is recommended. Refer to local codes.
NOTE  (−068 Model Only) Remove access panels and
horizontal drip shield from the corrugated padding
between the blower and coil assembly. Discard the
corrugated padding and the downflow drip shields from the
foam pads on top of the unit. (The shields are used for
downflow applications only.)

Page 7
CBX32MV SERIES
90º
BEND
CABINET
SUPPORT
COIL SHOWN IN UPFLOW POSITION FOR EASY
CONVERSION (LEFT−HAND AIR DISCHARGE)
TOP CAP
SCREWS
DRAIN PAN
REINSTALLED
HERE
DRAIN PAN
SHIPPING
LOCATION
TOP CAP ROTATED TO
CORRECT POSITION
 DRAIN PLUGS 
REINSTALLED HERE REMOVED FROM HERE
BACK COIL
END SEAL
TOP CAP
90º
BEND
ALIGN HOLES WITH
HOLES IN COIL END
PLATE.
INSTALL DRAIN PAN
BETWEEN TAB AND
EXTERIOR INNER WALL.
DETAIL A
DETAIL B
DETAIL C
HORIZONTAL DRIP
SHIELD SCREW
(FRONT COIL END
SEAL)
FRONT VIEW
3/16" PLASTIC
PLUG (REAR COIL
END SEAL)
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.
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 8
NOTE  For horizontal applications in high humidity
areas, remove the downflow rail closest to the drain pan.
To remove rail, remove screw from rail at back of unit and
at cabinet support rail. Remove downflow rail then replace
screws. Also, seal around the exiting drain pipe, liquid and
suction lines to prevent infiltration of humid air.
12. Knock out drain seal plate from access door. Secure
plate to cabinet front flange with screw provided.
13. Flip access door and replace it on the unit.
14. Set unit so that it is sloped 1/4 inch (6.35mm) toward
the drain pan end of the unit. Connect return and
supply air plenums as required using sheet metal
screws.
15. If suspending the unit, it must be supported along the
entire length of the cabinet. If using chain or strap, use
a piece of angle iron or sheet metal attached to the unit
(either above or below) so that the full length of the
cabinet is supported. Use securing screws no longer
than 1/2 inch (12.7mm) to avoid damage to coil or filter
as illustrated in figure 3 on page 6. Connect return
and supply air plenums as required using sheet metal
screws.
DOWNFLOW APPLICATION
Use the following procedures to configure the unit for
downflow operations:
CAUTION
If electric heat section with circuit breakers
(ECB29/ECB31) is applied to downflow CBX32MV
unit, the circuit breakers must be rotated 180° to the
UP position. See ECB29/ECB31 installation
instructions for more details.
Table 2 outlines the sizes of the various drip shields.
NOTE  (−068 Model Only) Remove access panels and
horizontal drip shield from the corrugated padding
between the blower and coil assembly.
NOTE  Discard the corrugated padding and the
downflow drip shields from the foam pads on top of the unit.
(The shields are used for downflow applications only.)
1. Remove the coil assembly from the unit.
2. For best efficiency and air flow, remove the horizontal
drain pan from the units in downflow positions as
illustrated in figure 6 on page 8.
3. Rotate cabinet 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:
DApply 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.
DApply 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
SIDE
VIEW
2" WIDE FOAM TAPE
DRIP SHIELD
1" WIDE FOAM TAPE (LONGER PIECE)
Figure 7. Applying Foam Tape to Drip Shield
COIL DRIP SHIELD
DRIP PAN
Figure 8. Downflow Drip Shields
6. Replace the coil assembly and blower if you have
removed it. Replace the coil access panel.

Page 9
CBX32MV SERIES
7. Set the unit so that it is level. Using sheet metal
screws, connect the return and supply air plenums as
required.
NOTE − For downflow application, metal or class I supply
and return air plenums must be used.
COMBUSTIBLE FLOOR
ADDITIVE BASE
PROPERLY SIZED
FLOOR OPENING
AIR
HANDER
UNIT
Figure 9. Downflow Combustible Flooring Base
8. For downflow installation on combustible flooring, an
additive base must be used as illustrated in figure 9 on
page 9. See CBX32MV Engineering Handbook for
downlfow combustible flooring base kits available for
this air handler.
9. Cut an opening appropriately sized for combustible
base. Base dimensions are illustrated in figure 10.
After opening has been cut, set the additive base into
opening. Connect outlet air plenum to the additive
base. Set the unit on the additive base so flanges of
the unit drop into the base opening and seal against
the insulation strips. The unit is now locked in place.
Install return air plenum and secure with sheet metal
screws.
TOP VIEW
OPENING
1-5/8 (41)
SIDE VIEW
1-5/8 (41)
11-3/8
(289)
2 (51)
1-5/8 (41)
24 (610) −068 ONLY
22-1/8 (562) OTHER MODELS
5/8 (16)
13-3/8 (340)
SUPPLY AIR OPENING
INCHES (MM)
−018/−024 08−1/4 (464)
−024/−030 and up 23−1/4 (591)
−018/−024 15
(381)
−024/−030 AND
UP 20 (508)
Figure 10. Downflow Combustible Base Dimensions
Brazing Connections
WARNING
Polyol ester (POE) oils used with HFC−410A
refrigerant absorb moisture very quickly. It is very
important that the refrigerant system be kept closed as
much as possible. DO NOT remove line set caps or
service valve stub caps until you are ready to make
connections.
WARNING
Danger of fire. Bleeding the refrigerant
charge from only the high side may result
in the low side shell and suction tubing
being pressurized. Application of a
brazing torch while pressurized may
result in ignition of the refrigerant and oil
mixture − check the high and low
pressures before unbrazing.
WARNING
When using a high pressure gas such as
dry nitrogen to pressurize a refrigeration
or air conditioning system, use a
regulator that can control the pressure
down to 1 or 2 psig (6.9 to 13.8 kPa).
CAUTION
Brazing alloys and flux contain materials which are
hazardous to your health.
Avoid breathing vapors or fumes from brazing
operations. Perform operations only in well ventilated
areas.
Wear gloves and protective goggles or face shield to
protect against burns.
Wash hands with soap and water after handling brazing
alloys and flux.
IMPORTANT
To prevent the build up of high levels of nitrogen when
purging, be sure it is done in a well ventilated area. Purge
low pressure nitrogen (1 to 2 psig) through the refrigerant
piping during brazing. This will help to prevent oxidation
and the introduction of moisture into a system.

Page 10
REMOVE ACCESS PANEL
A
REMOVE RUBBER PLUG FROM BOTH LIQUID
AND SUCTION LINES
B
USE A WET RAG TO PROTECT CTXV
SENSING BULB WHEN BRAZING
SUCTION LINE CONNECTIONS.
C
NITROGEN
HIGH
LOW
EITHER REMOVE OR PUSH PIPE WRAPPING BACK
THROUGH HOLE IN PIPING PLATE BEFORE LINE
SET CONNECTION AND BRAZING.
D
ECONNECT PIPES
FCONNECT GAUGES AND
START NITROGEN FLOW
GPLACE A WET RAG AGAINST PIPING
PLATE AND AROUND THE SUCTION
LINE CONNECTION. A
HBRAZE CONNECTION. ALLOW PIPE TO
COOL BEFORE REMOVING WET RAG
FROM CTXV SENSING BULB AND PIPING
PANEL AREA.
IREPEAT PREVIOUS PROCEDURE FOR LIQUID
LINE.
NOTE  REFER TO OUTDOOR UNIT INSTALLATION INSTRUCTIONS
FOR REFRIGERANT PIPING SIZE REQUIREMENTS.
NOTE  REFRIGERANT LINE SETS
SHOULD BE ROUTED TO ALLOW
FILTER ACCESSIBILITY.
NOTE  CBX32MV SERIES UNITS USE NITROGEN OR DRY AIR
AS A HOLDING CHARGE. IF THERE IS NO PRESSURE WHEN
THE RUBBER PLUGS ARE REMOVED, CHECK THE COIL FOR
LEAKS BEFORE INSTALLING.
REFER TO INSTRUCTIONS PROVIDED WITH OUTDOOR UNIT FOR
LEAK TESTING, EVACUATING AND CHARGING PROCEDURES
FLOW REGULATED NITROGEN (AT 1 TO 2 PSIG)
THROUGH THE REFRIGERATION GAUGE SET INTO THE
VALVE STEM PORT CONNECTION ON THE OUTDOOR
UNIT LIQUID LINE SERVICE VALVE AND OUT OF THE
VALVE STEM PORT CONNECTION ON THE SUCTION
SERVICE VALVE.
PIPING
PLATE
PLEASE READ IMPORTANT ISSUES CONCERNING BRAZING
OPERATIONS ON PAGE 10 BEFORE PROCEEDING.
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.
Figure 11. Brazing Connections

Page 11
CBX32MV SERIES
Table 3. CBX32MV Refrigerant Connections and
Line Set Requirements
Models Liquid
Line
Vapor /
Suction
Line
L15 Line Set
−018/024 3/8"
(10mm)
5/8"
(16mm) L15 line set sizes are
dependent on unit matchups.
See CBX32MV Engineering
Handbook to determine
correct line set sizes.
−024/030
and −036
3/8"
(10mm)
3/4"
(19mm)
−048 3/8"
(10mm)
7/8"
(22mm)
−060 3/8"
(10mm)
7/8"
(22mm)
Field−fabricated
−068 3/8"
(10mm)
1−1/8"
(29mm)
NOTE  Some applications may required a field provided 7/8" to
1−1/8" adapter
NOTE  When installing refrigerant lines longer than 50
feet, see the Lennox Refrigerant Piping Design and
Fabrication Guidelines, CORP. 9351−L9, or contact
Lennox Technical Support Product Applications for
assistance. To obtain the correct information from Lennox,
be sure to communicate the following information:
Installing the Condensate Drain
IMPORTANT
After removal of drain pan plug(s), check drain hole(s) to
verify that drain opening is fully open and free of any
debris. Also check to make sure that no debris has fallen
into the drain pan during installation that may plug up the
drain opening.
MAIN DRAIN
Connect the main drain and route downward to drain line or
sump. Do not connect drain to a closed waste system. See
Figure 13 for typical drain trap configuration.
OVERFLOW DRAIN
It is recommended that the overflow drain is connected to a
overflow drain line for all units. If overflow drain is not
connected, it must be plugged with provided cap.
For downflow orientation, the overflow drain MUST be
connected and routed to a overflow drain line. See Figure
13 for main and overflow drain locations based on coil
orientation.
LEFT−HAND AIR
DISCHARGE
MAIN DRAIN ON
RIGHT
OVERFLOW
DRAIN ON LEFT
UPFLOW OR
DOWNFLOW
RIGHT−HAND AIR
DISCHARGE
Figure 12. Main and Overflow Drain Locations
based on Coil Orientation
BEST PRACTICES
The following best practices are recommended to ensure
better condensate removal:
SMain and overflow drain lines should NOT be smaller
than both drain connections at drain pan.
SOverflow drain line should run to an area where
homeowner will notice drainage.
SIt is recommended that the overflow drain line be
vented and a trap installed. Refer to local codes.

Page 12
ABOVE
FINISHED
SPACE?
OVERFLOW DRAIN LINE
ALWAYS RUN AN OVERFLOW DRAIN LINE. IF NOT POSSIBLE TO
ROUTE OVERFLOW DRAIN LINE, INSTALL LOW VOLTAGE
OVERFLOW SWITCH KIT. WIRE KIT TO SHUT DOWN
COMPRESSOR PER INSTRUCTIONS.
NO
YES
LENNOX #
X3169 CLEAN OUT
VENT
PRESS IN
(DO NOT GLUE)
VENT MUST EXTEND
ABOVE HEIGHT OF
COIL DRAIN PAN BY
TWO INCHES (51MM)
1" X 3/4" X 3/4"
REDUCING
TEE WITH
PLUG
LENNOX* P−TRAP
49P66, J−TRAP #
91P90 OR ANY
PVC SCH 40 P− OR
J−TRAP 3/4"
OVERFLOW
DRAIN
OPTIONAL
SAFETY
PAN
AIR HANDLER DRAIN PAN
WHEN A COIL IS LOCATED ABOVE A FINISHED SPACE, A 3/4" (19.1MM) SECONDARY DRAIN
LINE MUST BE:
SCONNECTED TO SECONDARY DRAIN PAN
OR
SCONNECTED TO THE OVERFLOW DRAIN OUTLET OF THE AIR HANDLER DRAIN PAN.
TRAPS MUST BE DEEP ENOUGH TO OFFSET MAXIMUM STATIC DIFFERENCES 
GENERALLY, TWO INCHES (51MM).
DRAIN LINE SHOULD
SLOPE A MINIMUM OF
ONE INCH PER 10
FEET (25MM PER 3
METERS)
NOTE  WHEN A AIR HANDLER IS LOCATED ABOVE A FINISHED SPACE THE SECONDARY
DRAIN PAN MUST HAVE A LARGER FOOTPRINT THAN THE AIR HANDLER.
MAIN
DRAIN
TO APPROVED
DRAIN
FOR NEGATIVE PRESSURE COILS (BLOWER
AFTER COIL) TRAPS ARE REQUIRED ON ALL
DRAIN LINES CONNECTED TO COIL.
COMPACT OVERFLOW SWITCH WITH 3/4" FEMALE SLIP INLET
AND MALE ADAPTER, TWO PART DESIGN FOR USE WHERE
OBSTRUCTIONS PREVENT DIRECT THREADING
SECONDARY
DRAIN PAN
2"
(51MM)
TRAP DEPTH
*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.
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 13
CBX32MV SERIES
Seal the unit so that warm air is not allowed into the
cabinet. Warm air introduces moisture, which results in
water blow−off problems. This is especially important when
the unit is installed in an unconditioned area.
Make sure the liquid line and suction line entry points are
sealed with either the provided flexible elastomeric thermal
insulation, or field provided material (e.g. Armaflex,
Permagum or equivalent). Any of the previously mention
materials may be used to seal around the main and
auxiliary drains, and around open areas of electrical inlets.
Field Control Wiring
WARNING
Electric Shock Hazard.
Can cause injury or death.
Foil-faced insulation has conductive characteristics sim-
ilar 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 person-
al injury or death.
Wiring must conform to the current National Electric Code
ANSI/NFPA No. 70, or Canadian Electric Code Part I, CSA
Standard C22.1, and local building codes. Refer to
following wiring diagrams. See unit nameplate for
minimum circuit ampacity and maximum over−current
protection size.
WARNING
Run 24V Class II wiring only through specified low volt-
age opening. Run line voltage wiring only through speci-
fied high voltage opening. Do not combine voltage in one
opening.
Select the proper supply circuit conductors in
accordance with tables 310−16 and 310−17 in the
National Electric Code, ANSI/NFPA No. 70 or tables 1
through 4 in the Canadian Electric Code, Part I, CSA
Standard C22.1.
Separate openings have been provided for 24V low
voltage and line voltage. Refer to the dimension illustration
of specific location.
CAUTION
USE COPPER CONDUCTORS ONLY.
WIRING CONNECTIONS
1. Install line voltage power supply to unit from a 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 with
copper conductors. A complete unit wiring diagram is
located on the back side of the unit’s access panel.
3. Install low voltage wiring from outdoor to indoor unit
and from thermostat to indoor unit.
NOTE  For proper voltages, select control wiring gauge
per the charts on page 19.

Page 14
Figure 14. CBX32MV Air Handler Unit Typical Wiring Diagram

Page 15
CBX32MV SERIES
SENSOR
(CENTER SIDE−T0 −SIDE)
9−PIN
CONNECTOR
SECURING
SCREWS
AIR
HANDLER
CONTROL
AIR HANDLER CONTROL
L−BRACKET MOUNTING PLATE
19 IN.
(483 MM)
5−1/2 IN.
(140 MM)
9−PIN CONNECTOR
ELECTRIC HEAT RELAY
PART NO. 49W91
22V DIRECT CURRENT COIL
30 AMP CONTACT RATING
FASTEN THE PROBE
BRACKET TO THE
PLENUM WITH TWO
SELF−TAPPING SHEET
METAL SCREWS.
CONNECT WIRES TO DISCHARGE AIR SENSOR
TERMINAL ON AIR HANDLER CONTROL.
PLENUM
CBX32MV AIR HANDLER CONTROL
PART NO. 50W28
DISCHARGE SENSOR
(DAT)
TEMP RESISTANCE
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
DETAIL A
NOTE  EVENHEAT MODE CANNOT BE ENABLED WITH
HARMONY III DUE TO EACH CONTROL REQUIRING ITS OWN
DISCHARGE AIR SENSOR.
THE AIR HANDLER CONTROL (AHC) HAS
TWO SCREW TERMINALS MARKED
DISCHARGE AIR SENSOR. THE SENSOR
IS REQUIRED FOR EVENHEAT
OPERATION, IS FIELD−MOUNTED AND
MUST BE ORDERED SEPARATELY
(CATALOG # 88K38).
DETAIL B
TEMPERATURE RESISTANCE
CHART
NOTE − Due to varying duct designs
and airflow conditions, relocation of the
discharge sensor may be required to
insure accurate sensing.
Figure 15. Component Connections

Page 16
icomfort Toucht
THERMOSTAT
Air Handler or Furnace
Control
W3
H
O
C
L
Y2
DS
DH
G
R
Y1
W2
W1
R
Y1
L
C
Heat Pump or Air Conditioner Control
Y2
i−
W
O
i+
DS
R
C
i−
i+
R
C
i−
i+
OUTDOOR UNIT
THERMOSTAT
R
C
i−
i+
Outdoor sensor for outdoor
temperature display
(Optional).
OUTDOOR AIR SENSOR
Figure 16. Control (Field) Wiring  Communicating System (icomfort TouchtThermostat)

Page 17
CBX32MV SERIES
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.
L CONNECTION WIRED ON UNITS WITH LSOM.
CUT ON−BOARD LINK R−DS WHEN DEHUMIDIFICATION TERMINAL IS USED.
CBX32MV COMFORTSENSE
T7000
AIR
CONDITIONER
UNIT
(TWO−STAGE)
RED
BROWN
YELLOW
BLUE
BLACK
1
1
2
2
3
3
R
W3
W2
W1
O
Y1
Y2
G
DS
C
R
H
W2
W1
O
L
Y1
Y2
G
D
B
C
Y1−Y2
2−STAGE
COMPR
R−O
HEAT
PUMP
R−DS
DEHUM
OR
HARMONY
CUT FOR OPTION
CUT ON−BOARD LINK Y1−Y2 FOR TWO−STAGE AC
DO NOT CUT ON−BOARD LINK R −O.
IMPORTANT  USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL. SEE FIGURE 21,
CBX32MV JUMP AND LINK GUIDE FOR FURTHER
DETAILS.
AIR HANDLER
CONTROL
CONNECTED ON UNIT WITH LSOM. RESISTOR KIT (CAT #
47W97) IS REQUIRED WHEN CONNECTING THE
COMFORTSENSE 7000 (CATALOG# Y0349) WITH THE LSOM 2.
RESISTOR KIT NOT REQUIRED WHEN USING COMFORTSENSE
7000 CATALOG# Y2081).
Figure 17. Control (Field Wiring)  Cooling Application (Non−Communicating)
HEAT PUMP
UNIT
(TWO−STAGE) X2658 OUTDOOR SENSOR IS REQUIRED FOR OUTDOOR
TEMPERATURE DISPLAY, DEW POINT CONTROL, HEAT
PUMP AND DUAL FUEL BALANCE POINTS.
COMFORTSENSE
T7000
RRR
W3 H
W2
W2
W1 W1 W1
O
OO
L
L
Y1
Y1
Y1
Y2Y2
G
G
CCC
T
T
D
B
Y2
DS
O. D.
SENSOR
(X2658)
Y2
OUT
BL
1
1
CUT ON−BOARD LINK R −O.
CUT ON−BOARD LINK R−DS WHEN DEHUMIDIFICATION TERMINAL IS USED.
CUT ON−BOARD LINK Y1−Y2 FOR TWO−STAGE HP
2
2
3
3FIELD PROVIDED JUMPER BETWEEN Y2 OUT BL ON
HEAT PUMP TO Y2 ON CX32MV.
CONNECTED ON UNIT WITH LSOM. RESISTOR KIT (CAT
# 47W97) IS REQUIRED WHEN CONNECTING THE
COMFORTSENSE 7000 (CATALOG# Y0349) WITH THE
LSOM 2. RESISTOR KIT NOT REQUIRED WHEN USING
COMFORTSENSE 7000 CATALOG# Y2081).
Y1−Y2
2−STAGE
COMPR
R−O
HEAT
PUMP
R−DS
DEHUM
OR
HARMONY
CUT FOR OPTION
CBX32MV
IMPORTANT  USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL. SEE FIGURE 21,
CBX32MV JUMP AND LINK GUIDE FOR FURTHER
DETAILS.
Figure 18. Control (Field Wiring)  Heat Pump (Non−Communicating)
CAUTION
ELECTROSTATIC DISCHARGE
(ESD)
Precautions and Procedures
Electrostatic discharge can affect electronic components. Take precautions
during unit installation and service to protect the unit’s electronic controls.
Precautions will help to avoid control exposure to electrostatic discharge by
putting the unit, the control and the technician at the same electrostatic potential.
Neutralize electrostatic charge by touching hand and all tools on an unpainted unit
surface before performing any service procedure

Page 18
RED
YEL
BLU
BLK
BRN
COMFORTSENSEt
7000 THERMOSTAT
OUTDOOR UNIT
PUR
OUTDOOR
SENSOR
(X2658)
BLK
RED
BLK
PUR
EDA UNIT
FAN
RELAY
NOTES −
/1\ NOT REQUIRED FOR APPLICATIONS WITHOUT LSOM
/2\ NOT REQUIRED WITH SINGLE-SPEED OUTDOOR FAN
/3\ NOT REQUIRED FOR SINGLE STAGE
T
T
D
DO NOT CUT ON−BOARD LINK R −O.
CUT ON−BOARD LINK R−DS WHEN DEHUMIDIFICATION
TERMINAL IS USED.
CUT ON−BOARD LINK Y1−Y2 FOR TWO−
STAGE A/C
4
4AIR HANDLER CONTROL COMES FROM FACTORY WITH A METAL
JUMPERS BETWEEN W1 TO W2 AND W2 TO W3. SEE FIGURE 22
FOR HEAT SECTION CONFIGURATION.
.
Y1−Y2
2−STAGE
COMPR
R−O
HEAT
PUMP
R−DS
DEHUM
OR
HARMONY
CUT FOR OPTION
CBX32MV
IMPORTANT  USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL. SEE FIGURE 21,
CBX32MV JUMP AND LINK GUIDE FOR FURTHER
DETAILS.
CONNECTED ON UNIT WITH LSOM.
RESISTOR KIT (CAT # 47W97) IS
REQUIRED WHEN CONNECTING THE
COMFORTSENSE 7000 (CATALOG#
Y0349) WITH THE LSOM 2. RESISTOR
KIT NOT REQUIRED WHEN USING
COMFORTSENSE 7000 CATALOG#
Y2081).
Figure 19. Control (Field Wiring)  Cooling Application (Humiditrol ®and Second−Stage Outdoor
Fan Relay Wiring) Non−Communicating
YELLOW
BLUE (NOT REQUIRED FOR SINGLE STAGE)
RED
BLACK
PURPLE
PURPLE
BLACK
BLUE
RED
FAN RELAY (NOT REQUIRED
WITH SINGLE−SPEED
OUTDOOR FAN)
OUTDOOR
SENSOR
(X2658)
COMFORTSENSEt
7000 THERMOSTAT
CBX32MV
OUTDOOR UNIT
CUT ON−BOARD LINK R −O.
CUT ON−BOARD LINK Y1−Y2 FOR TWO−STAGE A/C ONLY
CUT ON−BOARD LINK R−DS WHEN DEHUMIDIFICATION
TERMINAL IS USED.
T
T
BROWN (NOT USED FOR APPLICATIONS WITHOUT LSOM
Y1−Y2
2−STAGE
COMPR
R−O
HEAT
PUMP
R−DS
DEHUM
OR
HARMONY
CUT FOR OPTION
IMPORTANT  USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL. SEE FIGURE 21,
CBX32MV JUMP AND LINK GUIDE FOR FURTHER
DETAILS.
Figure 20. Control (Field Wiring)  Heat Pump Application (Humiditrol ®and Second−Stage
Outdoor Fan Relay Wiring) Non−Communicating

Page 19
CBX32MV SERIES
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.
SMinimum temperature: −40ºF (−40ºC)
SMaximum 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
1Heat stage 1 relay coil
2Heat stage 2 relay coil
3Relay coil return
4Heat stage 3 relay coil
5Heat stage 4 relay coil
6Heat stage 5 relay coil
7L1 230VAC supply from heater kit
8L2 230 VAC supply from heater kit
9Not Used
CONTROL CONNECTIONS AND WIRING
REQUIREMENTS
This sections provides information on communicating and
non−communicating control connections and wire run
lengths.
Table 6. Air Handler Control Connections 
Communicating
Label Label Function
Thermostat
R24VAC
i+ RSbus data high connection
i− RSbus data low connection
C24VAC command (ground)
Outdoor Unit
R24VAC
i+ RSbus data high connection
i− RSbus data low connection
C24VAC command (ground)
Link
i+
Not used.
i−
Table 7. Run Length  Communicating
Wire Run Length AWG # Insulation/Core Types
Maximum length of wiring
for all connections on the
RSbus is limited to 1500
feet (457 meters).
18
Color−coded, temperature
rating 95ºF (35ºC) minimum,
solid core. (Class II Rated
Wiring)
Table 8. Air Handler Control Connections 
Non−Communicating
Label Function
W1 First−stage heating demand.
W2 Second stage heating demand. W1 input must be active to
recognize second stage heat demand. .
W3 Third stage heating demand. W1 and W2 inputs must be
active to recognize third stage heat demand.
G24VAC signal indicates the presence of a demand.
Y1 and
Y2 First and second stage cooling inputs.
C24VAC common.
R24VAC power.
DH Use in communicating system only
H24VAC output for humidification.
LUse in communicating system only
OReversing Valve input. (Energized by thermostat in cooling
mode.)
DS Blower speed control input for Harmony Zoning or thermo-
stat de−humidification control.
DS 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 Color−coded, temperature
rating 95ºF (35ºC) minimum,
solid core. (Class II Rated
Wiring)
More than 100’ (30m) 16

Page 20
OUTDOOR
AIR SENSOR
HEAT
1234
COOL
1234
DELAY
123 4
ADJUST
NORM + −
HUMIDIFICATION
SMART AUTO
EVENHEAT
1234
BLOWER
ONLY CFM
100
115
130
85
Y1−Y2 2−STAGE COMPR R−O
HEAT PUMP R−DS
DEHUM
OR
C
W1
W2
G
Y2
Y1
C
R
DH
H
L
O
DS
W3
FACTORY
JUMPER
FUSE 3 AMP
XFMR 24V
24 VAC
COM
3
6
9
1
4
7
XFMR LINE
G
7−SEGMENT LED
DEHUMIDIFICATION−
HARMONY LINK
(JUMPERS R to DS)
HEAT PUMP LINK
(JUMPERS R to O)
2−STAGE
COMPRESSOR LINK
(JUMPERS Y1 to Y2)
ON−BOARD LINK
OPTION SELECTION
1
CBX32MV / CBX40UHV
JUMPER & LINK GUIDE
−CUT ON−BOARD LINK (SOLDER TRACE) COMPLETELY
THROUGH BOTH LAYERS ON THE CONTROL BOARD
1
COOLING BLOWER RAMPING
DELAY
PROFILE #3
OFF−82%−100%−OFF
COOLING
HP
DELAY
PROFILE #2
DELAY
PROFILE #1
OFF−100%−OFF
DELAY
PROFILE #4
OFF−50%−82%−
100%−50%−OFF
*
(COOLING MODE UNLESS NOTED)
1234
1234
1234
1234
*
HUMIDIFICATION MODE
SMART MODE
−”H” ENABLED WHEN
HEAT ACTIVE
(HP or ELECT. HT)
AUTO MODE
−”H” ENABLED WHEN
BLOWER ACTIVE
& NO CLG
OR DEHUM
HUMIDIFICATION MODE
24VAC OUTPUT ON ”H”
FOR HUMIDIFIER OR
ACCESSORY INTERLOCK
SMARTAUTO
SMART
AUTO
FACTORY DEFAULT SETTING
*
COOLING MODE
BLOWER SPEED
HIGH
SPEED
MEDIUM−LOW
SPEED
LOW
SPEED
1234
MEDIUM−HIGH
SPEED
*
1234
1234
1234
(COOLING & HP MODE)
STANDARD
HEAT MODE
(STAGED BY TSTAT)
STANDARD HEAT MODE
(DEFAULT)
85
110
115
130
HEATING MODE
BLOWER SPEED
*
(ELECTRIC HT MODE)
1234
1234
1234
1234
LOW
SPEED
MEDIUM−LOW
SPEED
MEDIUM−HIGH
SPEED
HIGH
SPEED
NORM
+−
NORM
+−
NORM
+−
BLOWER
ADJUST SELECTION
NORMAL
(+ 10%)
SETTING
(−10%)
SETTING
*
*
EVENHEATER

MODE
85
DEGREE TARGET
DISCHARGE
TEMPERATURE
100
DEGREE
TARGET
115
DEGREE
TARGET
130
DEGREE
TARGET
85
110
115
130
−ENABLED WITH OPTIONAL
DISCHARGE AIR SENSOR
85
110
115
130
85
110
115
130
85
110
115
130
PUSH
BUTTON
HIGH
SPEED
(100%)
MEDIUM−HIGH
SPEED
(70%)
LOW
SPEED
(28%)
*MEDIUM−LOW
SPEED
(38%)
1234
1234
1234
1234
CONTINUOUS FAN
BLOWER SPEED
IMPORTANT: USE CARE WHEN CUTTING LINKS TO
PREVENT DAMAGE TO CONTROL.
2
5
8
P8
L1L2
L2 L1
INDOOR
BLOWER
POWER
EARTH
INDOOR BLOWER
SIGNAL
456
12 3
OUTDOOR UNIT
LINK
I + I −
I + I −
RC
I + I −
RC
THERMOSTAT
HUMIDITROL
DH
DISCHARGE
AIR SENSOR
HARMONY
R−DS
DEHUM
or
NO HARMONY ZONING
OR NO
COMFORTSENSE 7000
W/ DS CONNECTION
DO NOT CUT
HARMONY ZONING
OR
C0MFORTSENSE 7000
W/ DS CONNECTION
CUT LINK
HARMONY
R−DS
DEHUM
or
HARMONY
1
A/C UNIT HEAT PUMP UNIT
R−0
HEAT
PUMP
R−0
HEAT
PUMP
1
DO NOT CUT CUT LINK
2 STAGE
COMPR
1−STG COMPRESSOR 2−STG COMPRESSOR
Y1−Y2
1
DO NOT CUT CUT LINK
*
*
*
2 STAGE
COMPR
Y1−Y2
OFF−100%−100%−OFF
OFF−30sOFF−100%−100% OFF
Figure 21. Air Handler Configuration