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506294−01
General Information
The Elite
®
CBX27UH series air handler is designed for
installation with optional field−installed electric heat and a
matching HFC−410A outdoor unit
This instruction is intended as a general guide and does
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.
Shipping and Packing List
Package 1 of 1 contains the following:
1
Assembled air handler unit
1
Horizontal drip shield (CBX27UH−60 only)
NOTE − For down−flow applications, order kit number
83M57.
Requirements
IMPORTANT
This unit must be matched with an indoor coil as speci-
fied in Lennox Engineering Handbook. Coils previous-
ly charged with HCFC−22 must be flushed.
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), shall 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
These units are factory−configured for up−flow and
horizontal right−hand discharge installation. For down−flow
or horizontal left−hand discharge, certain field
modifications are required.
DISASSEMBLE/REASSEMBLE AIR HANDLER UNITS
The air handler units consists of two factory-assembled
sections. It may be necessary to disassemble the sections
when positioning the unit for installation.
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.
UP−FLOW APPLICATION
Use the following procedures to configure the unit for
up−flow operations:
1. Remove access panels.
2. Remove and discard the horizontal drip shield (−060
model, used only on horizontal applications) and the
corrugated padding between the blower and coil
assembly.
3. The horizontal drain pan must be removed when the
coil blower is installed in the up−flow position.
Removing horizontal drain pain will allow proper
airflow and increase efficiency.
4. 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.
5. 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 up−flow unit stand as
listed in table 1.
HORIZONTAL DRAIN PAN
(MUST BE REMOVED)
UP−FLOW/
DOWN−FLOW
DRAIN PAN
Figure 1. Up−flow Configuration
Table 1. Optional Unit Side Stand (Up−Flow Only)
Model
Kit Number
−21, −26, and −31
45K31
−41 through −65.
45K32
HORIZONTAL RIGHT−HAND DISCHARGE
APPLICATION
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.
