Page 4
506150−01 05/09
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
CBX32M units are factory−configured for upflow or
horizontal right−hand discharge installation. For downflow
or horizontal left−hand discharge, some field modification
is required.
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.
WARNING
Improper installation, adjustment, alteration,
service or maintenance can cause property damage,
personal injury or loss of life. Installation and
service must be performed by a qualified installer or
service agency.
IMPORTANT
Kit number 83M57 (LB−109844A) must be installed
for downflow application.
DISASSEMBLE AND REASSEMBLE AIR HANDLER
UNIT
The CBX32M air handler 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:
1. Remove access panels. Remove corrugated padding
from the space between the blower and coil
assemblies.
2. 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.
3. Place unit in desired location. Make sure that unit is
level. Connect return and supply air plenums as
required using sheet metal screws as illustrated in
figure 1.
4. Install units which have no return air plenum on a
mounting stand that is at least 14" from the floor for
proper air return. Lennox offers an optional upflow unit
stand as listed in table 1.
HORIZONTAL DRAIN PAN
(MUST BE REMOVED)
UPFLOW/
DOWNFLOW
DRAIN PAN
Figure 1. Upflow Configuration
Table 1. Optional Unit Side Stand (Upflow Only)
Model
Kit Number
−018 and −024
45K31
−036, −042, −048 and −060
45K32
NO ADJUSTMENT IS NECESSARY
HORIZONTAL DRIP SHIELD
UPFLOW/
DOWNFLOW
DRAIN PAN
HORIZONTAL
DRAIN PAN
Figure 2. Right−Hand Discharge Configuration
