10
Frame
Top of
Furnace
Fasteners (4)
Grille
Fur nace Filter
(not used with
A/C or H/P)
optional coil cabinet is recommended. The duct
system must be properly sized so as to account
for any additional external static pressure pro-
duced from the chosen filtering method.
NOTE: Refer to the instructions supplied with
any additional accessories for further installa-
tion details.
Filtering Methods - Non-Ducted Return Air
1.
Without A/C or H/P uncased coil:
- use the filter supplied with the furnace;
ensure that the filter is installed mat side
down between the filter retainer and fur-
nace top (see Figure 5).
2.
With A/C or H/P uncased coil:
- use the optional coil filters; the filter sup-
plied with the furnace is not used; RE-
MOVE AND DISCARD THIS FILTER.
3.
With optional coil housing:
- see coil cabinet instructions for specific
filtering methods.
Filtering Methods - Ducted Return Air
1.
Without optional coil housing:
- install a filter with a minimum unrestricted
medium area of 324 square inches in the
duct above the coil that is accessible for
monthly cleaning or replacement by home-
owner.
2.
With optional coil housing:
-install a filter with a minimum unrestricted
medium area of 324 square inches in the
duct above the coil that is accessible for
monthly cleaning or replacement by home-
owner.
Figure 5. Grille Support Frame and Grille
Assembly
2-3/8" MIN
(60 mm)
"
6-1/4
23-3/4"
(603 mm)
20"
3/4"
"
10
14-1/2"
(368 mm)
3" (76 mm)
"
4-1/4
"
5
"
3-3/8
REAR WALL OF ENCLOSURE
Furnace Outer
Door
OptionaL
Supply Wire
Entrance
For
Optional
A/C Or H/P
Center Line
17"
(432 mm)
14-1/2"
(368 mm)
16-5/8"
(422 mm)
(254 mm)
(86 mm)
(127 mm)
(108 mm)
(159 mm)
(19 mm)
(508 mm)
3-3/4"
(95 mm)
Furnace
Outline
Figure 6. Downflow Floor Cutout Locations (nominal dimensions)
