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Step 5.
Place unit in desired location. Unit must be level.
Connect return and supply air plenums as
required using sheet metal screws.
Step 6.
If the application will not include a return air
plenum, install the unit on a raised stand at least
14" from the floor to ensure proper air return.
Lennox offers an optional up−flow unit stand as
listed in table 1.
UP−FLOW/
DOWN−FLOW
DRAIN PAN
Figure 1. Up−flow Configuration
Table 1. Optional Unit Side Stand (Up−Flow Only)
Model
−21, −26, and −31
−41 through −65.
HORIZONTAL RIGHT−HAND AIR 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.
Step 1.
Remove access panels and the horizontal drip
shield (−068 model) and the corrugated padding
between the blower and coil assembly. Discard
the corrugated padding and the down−flow drip
shields from the foam pads on top of the unit.
Step 2.
Install the horizontal shield on the front edge of
the horizontal drain pan as illustrated in figure 2.
Step 3.
No further adjustment is necessary. Set unit so
that it is sloped 1/4 inch towards the drain pan end
of the unit.
Step 4.
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 to
avoid damage to coil or filter as illustrated in
figure 3. Connect return and supply air plenums
as required using sheet metal screws.
HORIZONTAL DRAIN PAN
(MUST BE REMOVED)
Kit Number
45K31
45K32
Page 5
UP−LOAD / DOWN−FLOW
DRAIN PAN
HORIZONTAL DRAIN
PAN
NO ADJUSTMENT IS NECESSARY
Figure 2. Right−hand Discharge Configuration
HORIZONTAL RIGHT−HAND DISCHARGE
APPLICATION IN HIGH HUMIDITY AREAS
For horizontal applications in high humidity areas remove
the down−flow rail closest to the drain pan.
To remove rail:
Step 1.
Remove the screws from the rail at the back of
unit and at the cabinet support rail.
Step 2.
Remove the down−flow rail then replace screws.
Step 3.
Seal around the exiting drain pipe, liquid line,
and suction line to prevent humid air from
infiltrating into the unit.
1/2 IN. SCREWS MAXIMUM
ANGLE IRON OR
SHEET METAL
FRONT VIEW
Figure 3. Suspending Horizontal 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.
HORIZONTAL LEFT−HAND AIR DISCHARGE
APPLICATION
SECURING TAB ON
CABINET SUPPORT RAIL
DOWNFLOW
RAIL
Figure 4. Left−hand Air Discharge Configuration
HORIZONTAL DRIP SHIELD (−068
MODELS)
DOWN−FLOW RAIL
ELECTRICAL INLET
CLEARANCE 4 IN. (102 MM)
END VIEW
HORIZONTAL
DRIP SHIELD
HORIZONTAL
DRAIN PAN
CB31MV SERIES
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