Optional Return Air Base
(Upflow Applications Only −− For use with B, C and D cabinets only)
AIR FLOW |
14
(356)
FURNACE
FRONT
7−1/4 (184)
4 |
| 1 23 (584) |
|
|
(102) |
| Overall | 1 Minimum |
|
| (Maximum) | 11 (279) | 1 22−7−16 | |
|
| 2 Maximum | ||
| 1 Unit side return air | 14 (356) | (570) | |
|
| Opening |
| Overall |
|
|
|
| |
|
|
|
| (Maximum) |
| 5−5/8 | SIDE RETURN |
| |
| AIR OPENINGS |
| ||
| (143) |
| ||
| (Either Side) |
| ||
|
|
| ||
|
|
|
| OPTIONAL RAB |
|
| 17−1/2 (446) RAB−B (98M60) |
| |||
|
|
| |||
|
|
| RETURN AIR BASE | 7/8 | |
| 21 (533) RAB−C (98M58) |
|
| ||
|
|
|
|
|
24−1/2 (622) RAB−D (98M59) | (22) |
|
FRONT VIEW
23 (584) | 3/4 | |
(19) | ||
| ||
27−5/8 (702) |
|
SIDE VIEW
NOTE− Optional Side Return Air Filter Kits are not for use with RAB Return Air Base.
1Both 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.
2To 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 9
G61MP 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 14.2".
Side Return Air
(with transition and filter)
20" X 25" X 1"
(508mm X635mm X 25mm)
Air Filter
Return | Screw |
| |
Air |
|
Plenum | Bottom Cap |
Transition | Bottom Panel |
| |
FIGURE 10 | FIGURE 11 |
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