Downflow Installation - Arcoaire N8MSN Series Installation Instructions Manual

Figure 10 - Leveling Legs
5/ 16

(8mm)
1 3 /

4
(44mm)
(8mm)
5 /

16
(44mm) 1 3/ 4
1
(44mm)
Leveling Legs (If Desired)
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.)
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
3 accessories are used:
Downflow combustible floor subbase
Coil model number END4X or ENW4X
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 is used, install as
shown in Figure 13.
441 01 1402 06
(8mm)
5/ 16

1 3 /

4
(44mm)
(8mm)
5/ 16


3/ 4

Specifications are subject to change without notice.
Figure 11 - Floor and Plenum Opening Dimensions
NOTE: It is recommended 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 box. 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)
A89014
Figure 12 - Furnace, Plenum, and Subbase Installed on
A
B D
C
a Combustible Floor
FURNACE
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
A96283
A96285
11