Downflow Application; Downflow Drip Shields - Lennox CBX32MV-018/024 Manual

9. Rotate top cap 180º front‐to‐back and align with
unused screw holes. Holes must align with front and
back coil end plates. The top cap has a 45º bend on one
side and a 90º bend on the other. The 90º bend must be
on the same side as the horizontal drain pan as
illustrated in Figure 3, Detail B.
NOTE - Be very careful when you reinstall the screws into
coil end plate engaging holes. Misaligned screws may
damage the coil.
DOWNFLOW RAIL
Figure 5. Left-Hand Discharge Configuration
10. From the upload position, flip cabinet 90º to the left and
set into place. Replace coil assembly. Replace coil
assembly. Install drain pan between exterior inner wall
and tab as illustrated in Figure 3, Detail C.
11. (-068 Model Only) Install the horizontal shield on the
front edge of the horizontal drain pan as shown in figure 5.
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 4 on page 17. 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:
CBX32MV
HORIZONTAL DRIP SHIELD (-068 MODEL)
FRONT EDGE OF HORIZONTAL
DRAIN PAN
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
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 19.
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:
Apply two pieces of foam tape provided down both
D
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 1‐inch wide foam tape
D
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
-018/024 Not Required
-024/030 15-7/8"
-036 17-7/8"
-048, -060, and -068 19-7/8"
Page 18
ECB29/ECB31 installation
Width
Not Required
4-11/16"
4-11/16"
4-11/16"