9
STEP 3: ATTACHING SUPPLY AIR PLENUM ADAPTOR
NOTICE: If unit is to be located in the attic and
installed through ceiling joists, attach supply plenum
adaptor in attic.
A. HORIZONTAL DISCHARGE:
Refer to Figure 2.3 and duct installation instructions
supplied with fan coil unit.
B. TO CONVERT TO VERTICAL DISCHARGE:
Refer to Figure 2.8 & 2.9
Tools required:
1
/
4
",
5
/
16
",
3
/
8
",
7
/
16
" box wrenches and nut
drivers,
5
/
32
" Allen wrench, utility knife & Malco S-3 offset
hand seamer (3" duct-bill pliers).
Field supplied: latex caulk, UL classified duct liner
adhesive (or equivalent).
NOTICE: An Electric Heat Module cannot be installed
after unit has been field converted to vertical supply
air discharge (due to resulting blower housing
obstruction).
Refer to Figure 2.8 for Steps 2 to 8a.
1. Place unit horizontally on a flat raised surface.
2. Remove all side access panels, return air panel and
cover plate from top panel.
3. Remove top panel by removing top/center screw
from electric control box and panel screws.
4. Remove (4) screws securing front panel flange to
blower housing.
5. Remove sealant around discharge opening.
6. Remove (3) remaining screws from electrical control
box. Set box aside.
7. Remove (2) screws attaching blower housing to
motor support channel flange.
8a. Remove (6) screws attaching motor mounting base
to motor support channel.
Refer to Figure 2.9 for Steps 8b to 18.
8b. Shift motor mounting base (and blower housing)
backtoward coil to second set of mounting lugs on
motor support channel. Rotate blower housing up 90°.
Reattach base with screws.
9. Cut insulation from discharge air location on top
panel (opening dimensions shown in Figure 2.3).
Insert cut piece into opening. Apply adhesive per
manufacturer's instructions. Attach cover plate to
front of unit.
10. Bend both flanges 90° into cabinet using 3" duct-bill
pliers. Pliers should engage full jaw depth (1-1/4") and
be centered on flange.
11. Insert blower housing into top panel. Reattach panel
to unit.
12. Align hole in blower housing with lower slot in motor
support channel flange. Attach housing to flange with
(1) previously removed screw.
13. Align (4) holes in top panel flange with holes in
blower housing. Attach with removed screws.
14. Assure blower wheel is centered in inlet and
discharge of blower housing. If required, adjust by
loosening (4) bolts securing motor. Shift motor and
refasten. For blower wheel adjustments, loosen set
screw (not shown), shift wheel and refasten.
15. Apply latex caulk to seal between blower housing
and top panel.
16. Reinstall electrical control box.
17. Place supply air plenum adaptor over discharge
opening. Align holes in plenum adaptor, gasket and top
panel. Secure with screws provided with adaptor.
NOTICE: 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.
18. Replace all panels and screws.
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