Step 3—Supply Air Connections
UPFLOW FURNACES
Connect supply-air duct to 3/4-in. flange on furnace supply-air
outlet. The supply-air duct attachment must ONLY be connected
to furnace supply-/outlet-air duct flanges or air conditioning coil
casing (when used). DO NOT cut main furnace casing to attach
supply side air duct, humidifier, or other accessories. All accesso-
ries MUST be connected external to furnace main casing.
Step 4—Return Air Connections
UPFLOW FURNACES
The return-air duct must be connected to bottom , sides (left or
right), or a combination of bottom and side(s) of main furnace
casing as shown in Fig. 1. Bypass humidifier may be attached into
unused side return air portion of the furnace casing. DO NOT
connect any portion of return-air duct to back of furnace casing.
Step 5—Filter Arrangement
The factory-supplied filter(s) is shipped in the blower compart-
ment. Determine location for filter and move filter retaining
hardware, if necessary, before attaching return-air duct. After
return-air duct has been connected to furnace, install filter(s) inside
furnace blower compartment. See Fig. 5 for side return application
and Fig. 6 for bottom return application.
A bottom closure panel is factory installed in bottom of furnace.
When bottom return inlet is desired, remove and discard enclosure
panel.
Filter retaining brackets, supports, and retainers are factory as-
sembled and shipped installed for side return application, with 1
set of all required hardware on each furnace. (See Fig. 5.)
For bottom return applications, remove front and back brackets
and supports from each side. The back bracket(s) are installed in
the rear of the furnace casing. Dimples are provided to mark
mounting screw locations.
The front bracket(s) are installed on bottom front plate, as shown
in Fig. 6, once bottom enclosure has been removed. Rotate filter
supports 180° so filter will rest on support and reinstall. Do not
reinstall in 17-1/2 in. casing. Install small U-shaped end of filter
retaining rod in rear bracket and front of filter retainer rod as
shown in Fig. 6. Two sets of hardware are needed for furnaces in
24-1/2 in. casings using 2 filters for bottom return. All hardware is
provided for filter installation.
Never operate unit without a filter or with filter access door
removed. A failure to follow this warning can cause a fire,
personal injury, or death.
NOTE:
Furnaces with a 17-1/2 in. wide casing require an
additional procedure when locating filter for bottom return-air
application. Field-fabricate a sheet metal filler strip 1 X 3 X 24-1/2
in. and install it along side of filter as shown in Fig. 6. Drive 2
screws through casing side and into filler strip to secure it in place.
Filter is to rest on top of the filler strip when installed.
Step 6—Leveling Legs (If Required)
When furnace is used with side inlet(s) and leveling legs are
required, refer to Fig. 7 and install field-supplied, corrosion-
resistant 5/16-in. machine bolts and nuts.
NOTE:
The length of the bolt should not exceed 1-1/2 in.
Fig. 5—Side Filter Arrangement
A93045
FILTER
RETAINER
WASHABLE
FILTER
Fig. 6—Bottom Filter Arrangement
A96030
WASHABLE
FILTER
FILTER
SUPPORT
FILTER
RETAINER
24
1
⁄
2
-IN. WIDE
CASINGS ONLY:
CUT AND FOLD
FACTORY-PROVIDED
FILTERS AS SHOWN
TO DESIRED SIZE.
17
1
⁄
2
-IN. WIDE
CASINGS ONLY:
INSTALL FIELD-SUPPLIED
FILTER FILLER STRIP
UNDER FILTER.
1
″
24
1
/
2
″
3
″
Table 3—Filter Information (In.)
FURNACE
CASING WIDTH
FILTER SIZE*
FILTER
TYPE
Side Return
Bottom Return
14-3/16
(1) 16 X 25 X 1†
(1) 14 X 25 X 1
Cleanable
17-1/2
(1) 16 X 25 X 1†
(1) 16 X 25 X 1
Cleanable
21
(1) 16 X 25 X 1
(1) 20 X 25 X 1† Cleanable
24-1/2
(2) 16 X 25 X 1†
(1) 24 X 25 X 1
Cleanable
* Filters can be field modified by cutting the frame as marked and folding to the
desired size. Alternate sizes can be ordered from your distributor or dealer.
† Factory provided with the furnace.
7
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