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4. Reinstall bottom filler panel and screws
A
PLENUM
OPENING
B
FLOOR
OPENING
C
Fig. 11 - - Floor and Plenum Opening Dimensions
FURNACE
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
Fig. 12 - - Furnace, Plenum, and Subbase Installed
on a Combustible Floor
FURNACE
CASING
WIDTH
Upflow Applications on Combustible or Noncombustible
Downflow Applications on Noncombustible Flooring (subbase
17–1/2
(445)
Downflow applications on combustible flooring (subbase
Downflow Applications on Combustible Flooring with Coil
Assembly or coil box (subbase not required)
Upflow Applications on Combustible or Noncombustible
Downflow Applications on Noncombustible Flooring (subbase
21
(533)
Downflow applications on combustible flooring subbase
Downflow Applications on Combustible Flooring with Coil
Assembly or coil box (subbase not required)
D
A96283
A96285
Table 4 – Opening Dimensions - - In. (mm)
APPLICATION
Flooring (subbase not required)
not required)
required)
Flooring (subbase not required)
not required)
required)
Fig. 13 - - Furnace, Plenum, and Coil Assembly or
Coil Box Installed on a Combustible Floor
HORIZONTAL INSTALLATION
WARNING
!
FIRE, EXPLOSION, AND CARBON MONOXIDE
POISONING HAZARD
Failure to follow this warning could result in personal
injury, death, and/or property damage.
Do not install the furnace on its back or hang furnace with
control compartment facing downward. Safety control
operation will be adversely affected. Never connect
return- -air ducts to the back of the furnace.
The furnace can be installed horizontally in an attic or crawl space
on either the left- -hand (LH) or right- -hand (RH) side. The furnace
can be hung from floor joists, rafters or trusses or installed on a
non- -combustible platform, blocks, bricks or pad.
PLENUM OPENING
A
16
(406)
15--- 7/8
(403)
15--- 1/8
(384)
15--- 1/2
(394)
19--- 1/2
(495)
19--- 3/8
(492)
18--- 5/8
(473)
19
(483)
10
FURNACE
APPROVED
COIL ASSEMBLY
OR
COIL BOX
COMBUSTIBLE
FLOORING
SHEET METAL
PLENUM
FLOOR
OPENING
FLOOR OPENING
B
C
21--- 5/8
16--- 5/8
(549)
(422)
19
16--- 1/2
(483)
(419)
19
16--- 3/4
(483)
(425)
19
16--- 1/2
(483)
(419)
21--- 5/8
20--- 1/8
(549)
(511)
19
20
(483)
(508)
19
20--- 1/4
(483)
(514)
19
20
(483)
(508)
A08556
D
22--- 1/4
(565)
19--- 5/8
(498)
20--- 5/8
(600)
20
(508)
22--- 1/4
(565)
19--- 5/8
(498)
20--- 5/8
(600)
20
(508)
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