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504719M 09/05
IMPORTANT
Kit number 83M57 (LB−109844A) must be installed
for downflow application.
Disassembling CB30M Blower Coil Unit
These units are shipped from the factory fully assembled.
The CB30M blower coil unit’s sections may be separated
to facilitate movement at some installation sites. If re-
quired, disassemble the unit as follows:
1. Remove access panels from both blower and coil as-
semblies. This will lighten the cabinet for lifting.
2. 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.
3. To reassemble, align cabinet sections and reinstall
screws. Replace access panels.
Upflow Application
1. Remove access panels. Remove corrugated padding
from the space between the blower and coil assem-
blies.
2. To ensure proper operation, remove the horizontal
drain pan from units in upflow configurations (see fig-
ure 1).
3. Place unit in desired location. Make sure that unit is
level. Connect return and supply air plenums as re-
quired using sheet metal screws.
4. Install units that have no return air plenum on a mount-
ing stand at least 14" from the floor for proper air re-
turn. Lennox offers an optional upflow unit stand.
(45K31 for CB29M−21, −26, and −31; 45K32 for
CB29M−41 through −65.)
Figure 1
Upflow Configuration
Horizontal Drain Pan
(Remove for Opti-
mum Performance)
Upflow/
Downflow
Drain Pan
Horizontal Right−Hand Discharge Application
1. Remove access panels. Remove corrugated padding
from the space between the blower and coil assembly.
2. No further adjustment is necessary. Set unit so that it is
sloped 1/4 inch toward the drain pan end of the unit.
NOTE − For horizontal applications, an auxiliary drain
pan is recommended. Refer to local codes.
NOTE − For horizontal applications in
high humidity
areas
, seal around the exiting drain pipe, liquid line,
and suction line to prevent infiltration of humid air.
Figure 2
Right−Hand Discharge Configuration
No Adjustment
is Necessary
Horizontal Drip Shield
Upflow/
Downflow
Drain Pan
Horizontal
Drain Pan
3. If the unit is to be suspended, it must be supported
along the entire length of the cabinet (see figure 3). If
using a chain or strap, attach a piece of angle iron or
sheet metal to the unit (either above or below the unit),
so that the full length of the cabinet is supported. Use
securing screws which are no longer than 1/2 inch to
avoid damaging the coil or filter. Use sheet metal
screws to connect the return and supply air plenums.
Figure 3
Suspending Horizontal Unit
FRONT VIEW
END VIEW
Angle Iron or
Sheet Metal
Electrical Inlet Clearance
4 in. (102 mm)
1/2 IN.
SCREWS
MAX.
CAUTION
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 cabi-
net. Support the coil when removing it.
