Alternate Attachment Method - Nordyne M4RC Upflow Installation Instructions Manual

3. Prepare the A/C coil box for installation:
a. Remove two screws (Figure 17) from the sides of
the A/C coil box.
b. Install the close-off plate on the bottom of the of the
coil box.
c. Align the screw holes in the close off plate and the
coil box. Secure both components with the screws
removed in step 3-a.
4. Install the furnace:
a. Place the A/C coil box on the duct connector until it is
fi rmly against the mounting plate tabs. Mounting plate
tabs must be bent upwards to prevent interference
with furnace. See step 2-j.
b. Secure the A/C coil box to the connector assembly
and wood fl oor with appropriate size screws at all
four corners. NOTE: To minimize damage to coil
box, see Figure 18 for appropriate screw locations.
c. Install the furnace on top of the A/C coil box. Align
the furnace evenly on the coil box from front to back
and side to side (Figure 19).
d. Secure the furnace to the A/C coil box with an
attachment bracket (Figure 19) on both sides of
the furnace. NOTE: The attachment brackets must
be evenly positioned over the seam between the
A/C coil box and the furnace. Install four self drilling
screws in each bracket.

Alternate Attachment Method

The duct connector is designed for use on ducts 12" in
width. However if there is insuffi cient clearance to bend
the duct connector tabs, this alternate attachment method
may be used.
1. Score and cut the top of the supply air duct as indicated
in Option 1 or Option 2 (Figure 20). With Option 1
choice, cut out the metal from the shaded area.
2. Fold the two fl aps (Options 1 or 2) up to form the
opening for the duct connector.
3. Install the duct connector with the bottom tabs
extending into the supply air duct.
4. Bend the tabs on the bottom of the duct connector
upwards and as tight as possible against the supply
air duct (Figure 21, page 19).
5. Form the fl aps (Options 1 or 2) up against the duct
connector as tight as possible.
6. Secure the duct connector fl aps to the supply air
duct with staples (3 minimum) or if a 2x block/joist is
not provided, use sheet metal screws (2 minimum).
NOTE: The duct connector tabs may be attached to
the air duct with sheet metal screws or other suitable
fasteners as long as the duct connector and the air
duct are securely attached (See Figure 21).
7. Seal all connections with industrial grade sealing tape
or liquid sealant. NOTE: Requirements for sealing
ductwork vary from region to region. Consult with
local codes for requirements specifi c to your area.
18
Figure 17. Close-Off Plate
2 Screws
both sides
Figure 18. A/C Coil Box Installation
Furnace
Attachment
A/C Coil Box
Figure 19. Attachment Bracket
OPTION 1
Remove
this
Flap
Supply
Air Duct
Remove
this
Flap
Figure 20. Narrow Air Duct Openings
Coil Box
Wood
Floor
Supply
Air Duct
Bracket
OPTION 2
Cut Here
Cut Here