9
STEP 3: ATTACHING SUPPLY AIR PLENUM RING
NOTE: If the unit is to be located in the attic and
installed through the ceiling joists, attach the supply
plenum flange in the attic.
A. HORIZONTAL DISCHARGE:
Refer to Figure 2.8.
B. VERTICAL DISCHARGE:
Refer to Figure 2.9A & 2.9B
Tools required:
5
/
16
" box wrench,
5
/
16
" nut driver, drill and
1
/
4
" drill bit.
Refer to Figure 2.9A for Steps 2 to 5a.
1. Place unit horizontally on a flat surface.
2. Remove side access panels, the cover plate from the
top panel and top of unit.
3. Remove the two screws securing the front panel
flange to the blower housing.
4. Remove the two screws attaching the blower housing
to the motor support channel flange.
5a. Remove the six (6) screws attaching the motor
mounting base to the motor support channel.
Refer to Figure 2.9B for Steps 5b to 14.
5b. Shift the motor mounting base (and blower housing)
back towards the coil to the second set of mounting lugs
on the motor support channel. When in position, reattach
the motor mounting base to the motor support channel
with the six screws.
6. Rotate the blower housing 90° to face upwards. Align
the hole in the side blower housing with the upper slot in
the motor support channel flange and join the two parts
with one of the previously removed screws.
7. Attach the two flanges supplied, one to each side of
the blower housing outlet. Align the holes in the flange
with the holes in the housing and attach with screws
supplied.
8. Drill out the four (4) screw holes in the top panel
securing the removed cover plate to
1
⁄4" inch diameter.
9. Make a 2" long cut in the top panel insulation from
each corner of the opening toward the sides of the unit to
prepare for
Step 11
.
10. Reposition the top panel on the unit
taking care
to
straddle the evaporator coil with coil support brackets and
to replace all screws.
11. Fold back the top insulation flaps created in
Step 9
and position the flanges on the blower housing discharge
against the top panel. Place the supply plenum flange
over the opening. Align the holes in the flange, gasket
and top panel with the blower housing flange holes and
secure with the screws provided. Reposition the top
insulation flaps over the blower housing flanges. The
insulation must be in place to prevent condensation
forming on the top panel.
12. Check that the blower wheel is centered in the inlet
and discharge of the blower housing. To make any
adjustments, loosen the 4 bolts securing the motor, shift
the motor as required and refasten the 4 bolts.
13. Place the coverplate removed from the top panel
over opening in the front panel and screw in place.
NOTE: Check that all inside cabinet surfaces are
covered with insulation, add insulation if required. An
uninsulated panel will “sweat” and condensate will
form on the cabinet.
14. Replace the side access panels.
