2 - Return air from single side with optional RAB Return
Air Base. See figure 7.
3 - Return air from bottom.
4 - Return air from both sides.
5 - Return air from bottom and one side.
Refer to Engineering Handbook for additional information.
Side Return Air
(with transition and filter)
20" X 25" X 1"
(508mm X635mm X 25mm)
Air Filter
Return
Air
Plenum
FIGURE 5
G71MPP applications which include side return air and
a condensate trap installed on the same side of the
cabinet require either a return air base or field-fabri-
cated transition to accommodate an optional IAQ ac-
cessory taller than 14.5'"
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 6.
Screw,/
Bottom
FIGURE 6
Optional Return Air Base
(Upflow Applications Only -- For use with B, C and D cabinets only)
Removing the Bottom Panel
J
t
Cap
t4
(356)
r 123(584) ---_-_
Overall
(Maximum) 1Minimu_ I
I 11(279) I
2 Maximum I
' 1 Unit sidereturn 14_56) i
I air opening
FURNACE
FRONT
5-5/8 SIDE RETURN AIR
(143) OPENINGS
_.t (Either Side)
t-
-- 23 (584)OPTIONAL RAB
17-1/2 (446) RAB-B (98M60) RETURN AIR BASE
21 (533) RAB-C (98M58) -I_ 27-5/8 (702) --I1,-
24-1/2 (622) RAB-D (98M59) 7/8
FRONT VIEW (22) SIDE VIEW
f
122-7-16
(570)
Overall
(Maximum)
_l
-T
3/4
(19)
NOTE- Optional Side Return Air Filter Kits are not for use with RAB 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 ram).
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.
NOTE- Optional Side Return Air Filter Kits are not for use with RAB Return Air Base.
FIGURE 7
Page 8
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