Page 8
NOTE For horizontal applications in high humidity
areas, remove the downflow rail closest to the drain pan.
To remove rail, remove screw from rail at back of unit and
at cabinet support rail. Remove downflow rail then replace
screws. Also, seal around the exiting drain pipe, liquid and
suction lines to prevent infiltration of humid air.
12. Knock out drain seal plate from access door. Secure
plate to cabinet front flange with screw provided.
13. Flip access door and replace it on the unit.
14. Set unit so that it is sloped 1/4 inch (6.35mm) toward
the drain pan end of the unit. Connect return and
supply air plenums as required using sheet metal
screws.
15. 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 (12.7mm) to avoid damage to coil or filter
as illustrated in figure 3 on page 6. Connect return
and supply air plenums as required using sheet metal
screws.
DOWNFLOW APPLICATION
Use the following procedures to configure the unit for
downflow operations:
CAUTION
If electric heat section with circuit breakers
(ECB29/ECB31) is applied to downflow CBX32MV
unit, the circuit breakers must be rotated 180° to the
UP position. See ECB29/ECB31 installation
instructions for more details.
Table 2 outlines the sizes of the various drip shields.
NOTE (−068 Model Only) Remove access panels and
horizontal drip shield from the corrugated padding
between the blower and coil assembly.
NOTE Discard the corrugated padding and the
downflow drip shields from the foam pads on top of the unit.
(The shields are used for downflow applications only.)
1. Remove the coil assembly from the unit.
2. For best efficiency and air flow, remove the horizontal
drain pan from the units in downflow positions as
illustrated in figure 6 on page 8.
3. Rotate cabinet 180º from the upright position. See
figure 6. You may need to first remove the blower
assembly to lighten the cabinet for lifting.
4. Foam tape that is provided creates a seal between the
drip shield and the coil so that water does not leak into
the air stream. The foam tape pieces are precut. Apply
the tape to the drip shields as illustrated in figure 7 and
specified as follows:
D 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.
D Apply the longer piece of 1-inch wide foam tape
between the end pieces of tape.
5. From the underside of the coil, install the downflow drip
shield firmly in place as illustrated in figure 8.
Table 2. Downflow Drip Shields (Tape Required)
Units Length Width
−018/024 Not Required Not Required
−024/030 15−7/8" 4−11/16"
−036 17−7/8" 4−11/16"
−048, −060, and −068 19−7/8" 4−11/16"
HORIZONTAL DRAIN PAN
(REMOVE FROM UNIT)
UP−LOAD /
DOWNFLOW
DRAIN PAN
Figure 6. Downflow Discharge Position
SIDE
VIEW
2" WIDE FOAM TAPE
DRIP SHIELD
1" WIDE FOAM TAPE (LONGER PIECE)
Figure 7. Applying Foam Tape to Drip Shield
COIL
DRIP SHIELD
DRIP PAN
Figure 8. Downflow Drip Shields
6. Replace the coil assembly and blower if you have
removed it. Replace the coil access panel.
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