Downflow Installation - International comfort products B Series Installation Instructions Manual

INSTALLATION INSTRUCTIONS
Figure 19 Removing Bottom Closure Panel
BOTTOM
PLATE
Side Return Air Inlet
These furnaces are shipped with bottom closure panel installed
in bottom return−air opening. This panel MUST be in place
when only side return air is used.
NOTE: Side return−air openings can be used in UPFLOW and
most HORIZONTAL configurations. Do not use side return−air
openings in DOWNFLOW configuration. (See
Figure 28 and Figure 29)
Leveling Legs (If Desired)
In upflow position with side return inlet(s), leveling legs may be
used. (See Figure 20) Install field−supplied, 5/16 x 1−1/2−in. (8
x 38 mm) (max) corrosion−resistant machine bolts, washers
and nuts.
Figure 20 Leveling Legs
NOTE: Bottom closure must be used when leveling legs are
used. It may be necessary to remove and reinstall bottom
closure panel to install leveling legs. To remove bottom closure
panel, see Step 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.
2. For each leg, install nut on bolt and then install bolt with
nut in hole. (Install flat washer if desired.)
20
3.
4.
5.

DOWNFLOW INSTALLATION

NOTE: The furnace must be pitched as shown in Figure 18 for
proper condensate drainage.
Supply Air Connections
NOTE: For downflow applications, this furnace is approved for
use on combustible flooring when any one of the following two
accessories are used (see specification sheets for list of
approved accessories):
•
•
1.
2.
3.
L11F004
4.
Figure 21
Figure 27,
NOTE: It is recommended that the perforated supply−air duct
flanges be completely 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 22)
CUT HAZARD
Failure to follow this caution may result in personal
injury.
Sheet metal parts may have sharp edges or burrs. Use
A89014
care and wear appropriate protective clothing, safety
glasses and gloves when handling parts, and servicing
furnaces.
Connect supply−air duct to supply−air outlet on furnace. Bend
flange inward past 90_ with wide duct pliers (See Table 1
Figure 22) The supply−air duct must be connected to ONLY
the furnace supply outlet or air conditioning coil casing (when
used). When installed on combustible material, supply−air duct
must be connected to ONLY the factory−approved accessory
Specifications subject to change without notice.
Gas Furnace: N9MSB
Install another nut on other side of furnace base. (Install
flat washer if desired.)
Adjust outside nut to provide desired height, and tighten
inside nut to secure arrangement.
Reinstall bottom closure panel if removed.
Special Base − NAHA01101SB
Cased Coil Assembly − EAM4X, END4X, ENW4X
Determine application being installed from Table 5.
Construct hole in floor per Table 5 and Figure 21.
Construct plenum to dimensions specified in Table 5
and Figure 21.
Install as shown in Figure 23. If Coil Assembly Part is
used, install as shown in Figure 24 .
Floor and Plenum Opening
Dimensions
CAUTION
!
A96283
440 01 4102 01