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CAUTION
If electric heat section with circuit breakers
(ECB29/ECB31) is applied to down−flow CB31MV
unit, the circuit breakers must be rotated 180° to the
UP position. See ECB29/ECB31 installation instruc-
tions for more details.
The following table lists the sizes of the available drip
shields.
Table 1. Down−flow Drip Shields
Unit
Part No.
CB31MV−41
LB−74272
CB31MV−051, 065
LB−89864
Step 1.
Remove the access panels. If necessary,
remove the corrugated padding from the space
between the blower and coil assemblies.
Remove the drip shields from the inside of the
cornerpost packaging.
Step 2.
Remove the coil assembly from the unit.
Step 3.
Remove the horizontal drain pan to ensure peak
operating efficiency and proper air flow in the
down−flow position as illustrated in figure 7.
UP−FLOW/DOWN−FLOW
DRAIN PAN
Figure 7. Down−flow Air Discharge Position
Step 4.
Rotate cabinet 180° from the upright position. It
may be necessary to remove the blower
assembly to lighten the cabinet for lifting.
Step 5.
Apply precut foam tape to the drip shields as
illustrated in figure 9. The foam tape creates a
seal between the drip shield and the coil to
prevent water from entering into the air stream.
Step 6.
From the underside of the coil, install the
down−flow drip shield firmly in place as illustrated
in figure 10.
Step 7.
Replace the coil assembly and blower (if it was
removed). Replace the coil access panel.
Step 8.
Make sure the air handler unit is level. Connect
the return and supply air plenums as required
using sheet metal screws.
Length
Width
17.875
4.6718
19.875
4.6718
HORIZONTAL DRAIN
PAN (REMOVE FOR
DOWN−FLOW
APPLICATION)
Page 7
PROPERLY SIZED
FLOOR OPENING
Figure 8. Install Unit on Combustible Flooring
SIDE VIEW
APPLY TWO PIECES OF FOAM TAPE (PROVIDED) DOWN BOTH ENDS OF EACH
SHIELD. THE TAPE SHOULD MEASURE 4−3/4" X 2" (120 X 25 MM). ENSURE THAT
THE TAPE COVERS BOTH SIDES OF THE SHIELD EQUALLY.
APPLY THE LONGER PIECE OF FOAM TAPE BETWEEN THE PIECES ON EACH END.
THIS PIECE OF TAPE IS 1" WIDE.
Figure 9. Applying Foam Tape to Drip Shields
COIL
COIL
Figure 10. Down−flow Drip Shields
NOTE − For down−flow application, metal or class I supply
and return air plenums must be used.
For down−flow installation on combustible flooring, an
additive base must be used as illustrated in figure 8.
BLOWER
FOR DOWN−FLOW
COIL UNIT
APPLICATIONS
COMBUSTIBLE FLOOR
ADDITIVE BASE
DRIP SHIELD WITHOUT
FOAM TAPE
DRIP PAN
DRIP SHIELD
WITH FOAM
TAPE
DRIP PAN
CB31MV SERIES
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