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Transition
Figure 6. Side Return Air
(with Transition and Filter)
Removing the Bottom Panel
Remove the two screws that secure the bottom cap to the
furnace. Pivot the bottom cap down to release the bottom
panel. Once the bottom panel has been removed, reinstall
the bottom cap. See Figure 7.
Shipping Bolt Removal
Units with 1/2 hp blower motor are equipped with three
flexible legs and one rigid leg. The rigid leg is equipped
with a shipping bolt and a flat white plastic washer (rather
than the rubber mounting grommet used with a flexible
mounting leg). See Figure 8. The bolt and washer must be
CONDENSATE
TRAP
17−1/2 (446) B Width (68W62)
21 (533) C Width (68W63)
24−1/2 (622) D Width (68W64)
NOTE- Optional side return air filter kits are not for use with return air base.
1
Both the unit return air opening and the base return air opening must be covered by a single plenum or IAQ cabinet.
Minimum unit side return air opening dimensions for units requiring 1800 cfm or more of air (W x H): 23 x 11 in. (584 x 279 mm).
The opening can be cut as needed to accommodate plenum or IAQ cabinet while maintaining dimensions shown.
Side return air openings must be cut in the field. There are cutting guides stenciled on the cabinet for the side return air
opening. The size of the opening must not extend beyond the markings on the furnace cabinet.
2
To minimize pressure drop, the largest opening height possible (up to 14 inches) is preferred.
Page 8 of 74
20" X 25" X 1"
(508mm X 635mm X 25mm)
Air Filter
Return
Air
Plenum
FURNACE
FRONT
INDOOR AIR
QUALITY
CABINET
(PCO, Filter
AIR FLOW
Cabinet, etc.)
OPTIONAL
RETURN
AIR BASE
FRONT VIEW
Figure 9. Optional Return Air Base
(Upflow Applications Only)
removed before the furnace is placed into operation. After
the bolt and washer have been removed, the rigid leg will
not touch the blower housing.
Figure 7. Removing the Bottom Panel
3−1/4
IF BASE
(83)
IS USED
WITHOUT
IAQ CABINET,
A SINGLE
1
RETURN AIR
PLENUM
MUST
COVER BOTH
UNIT AND
RETURN
7−1/4
(143)
AIR BASE
(184)
OPENINGS
Issue 2346
Units with 1/2 HP Blower
Figure 8.
1
23 (584)
Overall
1
(Maximum)
Minimum
11 (279)
Maximum
2
Unit side return air
14 (356)
Opening
SIDE RETURN
5−5/8
AIR OPENINGS
(Either Side)
23
(584)
26−7/8
(683)
SIDE VIEW
Motor
1
22−7/16
(570)
Overall
(Maximum)
3/4
(19)
508364-01
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