Nordyne M4RC Upflow Installation Instructions Manual page 17

IMPORTANT NOTE: Cut-outs in the fl oor, ceiling, roof,
walls and/or ductwork must be carefully located to
avoid misalignment of the furnace, combustion air
piping, and vent piping.
1. Determine the depth of the fl oor cavity:
a. Measure 10" from the rear wall or alcove and mark
the centerline of the cut-out on the fl oor. Using the
centerline as a starting point, draw the rest of the
cut-out to the dimensions shown in Figure 13.
b. Cut out the fl oor opening 1/16" larger than the actual
cutout drawn. This will allow some clearance when
installing the duct connector.
c. Measure from the top of the fl oor down to the top of
the supply air duct to obtain the depth ("X") of the
fl oor cavity.
d. See Table 4 to determine which duct connector to
use.
2. Install the duct connector:
NOTE: The duct connector is designed for use on ducts
12" in width. However ducts narrower than 12" may not
allow suffi cient clearances for this type of installation. For
an alternate installation method, see page 18.
a. Center the duct connector in the fl oor opening with
bottom tabs resting on top of the supply air duct.
b. Mark the cut-out area on the supply air duct by
tracing around the connector tabs (Figure 11,
page 16) of the duct connector.
c. Remove the duct connector and cut out the marked
area of the supply air duct 1/4" larger the actual
cutout drawn.
d. Install the duct connector back in the fl oor opening
with the bottom tabs extending into the supply air
duct.
e. Install the mounting plate (Figure 14) under the back
side of the duct connector. Align the screw holes in
both components.
f. Secure the duct connector and the mounting plate
to the wood fl oor with appropriate size screws.
g. Install 2 plates (Figure 15) on top of the duct
connector, one on each side (left and right) of the
opening. Align the screw holes in both components.
h. Secure both plates and duct connector to the wood
fl oor with appropriate size screws.
i. Bend the connector tabs on the bottom of the duct
connector upwards and as tight as possible against
the supply air duct.
j. Bend both tabs on the mounting plate (Figure 16)
up 90°.
k. 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.
REAR WALL OF CLOSET OR ALCOVE
ALT. FUEL
LINE HOLE
FURNACE CABINET OUTLINE
Figure 13. Floor Cutout Dimensions
Hole for
Gas Line
Duct
Connector
Figure 14. Duct Connector Installed
Figure 15. Duct Connector Side Plates
DUCT CONNECTOR
BEND TABS TIGHTLY
AGAINST SUPPLY AIR DUCT
Figure 16. Duct Connector Tabs
Floor Cut-Out for
10"
Duct Connector
C L
13 1/4"
FUEL
LINE
HOLE
C L
Bend tabs
up 90°
Mounting Plate
SUPPLY
AIR DUCT
17