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NOTE: Remove furnace perforated, supply-air duct flanges when they interfere with mating flanges on coil or downflow subbase. To remove
perforated, supply-air duct flanges, use wide duct pliers, duct flange tool, or hand seamers to bend flange back and forth until it breaks off. Be
careful of sharp edges. (See Fig. 21.)
WARNING: Do not bend duct flanges inward as shown in Fig. 21. This will affect airflow across heat exchangers and
may cause limit cycling or premature heat exchanger failure. Remove duct flange completely or bend it inward a minimum
of 210° as shown in Fig. 21.
PROCEDURE 3—INSTALLATION IN HORIZONTAL APPLICATIONS
These furnaces can be installed horizontally in either horizontal left or right discharge position. In a crawlspace, the furnace can either be hung
from floor joist or installed on suitable blocks or pad. Furnace can be suspended from each corner by hanger bolts and angle iron supports. (See
Fig. 22.) Cut hanger bolts (4 each 3/8-in. all-thread rod) to desired length. Use 1 X 3/8-in. flat washers, 3/8-in. lock washers, and 3/8-in. nuts on
hanger rods as shown in Fig. 22. Dimples are provided for hole locations. (See Fig. 2.)
Fig. 18—Floor and Plenum Opening Dimensions
A96283
PLENUM
OPENING
C
A
B
D
FLOOR
OPENING
Fig. 19—Furnace, Plenum, and Subbase Installed
on a Combustible Floor
A96285
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
FURNACE
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
—19—