Downflow Installation - International comfort products N8MXL Installation Instructions Manual

closure panel to install leveling legs. To remove bottom
closure panel, see Item 1. in Bottom Return Air Inlet section.
To install leveling legs:
1. Position furnace on its back. Locate and drill a hole in
each bottom corner of furnace. (See Figure 10)
2. For each leg, install nut on bolt and then install bolt and
nut in hole. (Install flat washer if desired.)
3. Install another nut on other side of furnace base. (In-
stall flat washer if desired.)
Figure 10 − Leveling Legs
5/ 16

(8mm)
5/ 16
1 3 /

4
(44mm)
(8mm)
5 /

16
(44mm) 3/ 4
1

1 3/ 4
(44mm)
4. Adjust outside nut to provide desired height, and tight-
en inside nut to secure arrangement.
5. Reinstall bottom closure panel if removed.

DOWNFLOW INSTALLATION

NOTE: For downflow applications, this furnace is approved
for use on combustible flooring when any one of the following
two accessories are used:
S
Downflow combustible floor subbase
S
Coil model numbers END4X, ENW4X
S
Coil casing model number NAEA
1. Determine application being installed from Table 4.
2. Construct hole in floor per Table 4 and Figure 11.
3. Construct plenum to dimensions specified in Table 4
and Figure 11.
4. If downflow subbase is used, install as shown in
Figure 12. If coil model numbers END4X, ENW4X or
coil casing model number NAEA are used, install as
shown in Figure 13.
NOTE: It is required that the perforated supply−air duct
flanges be completely folded over or removed from furnace
when installing the furnace on a factory−supplied cased coil
or coil casing. To remove the supply−air duct flange, use wide
duct pliers or hand seamers to bend flange back and forth
until it breaks off. Be careful of sharp edges. (See Figure 14)
Bottom Return Air Inlet
These furnaces are shipped with bottom closure panel
installed in bottom return−air opening. Remove and discard
this panel when bottom return air is used. To remove bottom
closure panel, perform the following:
1. Tilt or raise furnace and remove two screws holding
bottom filler panel. (See Figure 9)
2. Rotate bottom filler panel downward to release holding
tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws
441 01 1421 01
(8mm)

1 3 /

4
(44mm)
(8mm)
5/ 16


Specifications are subject to change without notice.
Figure 11 − Floor and Plenum Opening Dimensions
Figure 12 − Furnace, Plenum, and Subbase Installed
A89014
Figure 13 − Furnace, Plenum, and Coil or
Coil Casing Installed on a Combustible Floor
A
B D
C
on a Combustible Floor
FURNACE
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
FURNACE
APPROVED
COIL ASSEMBLY
OR
COIL BOX
COMBUSTIBLE
FLOORING
SHEET METAL
PLENUM
FLOOR
OPENING
A96283
A96285
A08556
11