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:
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.
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:
S
Connected to secondary drain pan
or
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.
