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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)
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.
operation will be adversely affected.
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.
Suspended Furnace Support
The furnace may be supported under each end with threaded rod,
angle iron or metal plumber's strap as shown. (See Fig. 15 and
16) Secure angle iron to bottom of furnace as shown.
Heavy- -gauge sheet metal straps (plumber's straps) may be used
10
A96285
Table 4 – Opening Dimensions - - In. (mm)
APPLICATION
Flooring (subbase not required)
not required)
required)
Flooring (subbase not required)
not required)
required)
Safety control
Never connect
Specifications are subject to change without notice.
FURNACE
APPROVED
COIL ASSEMBLY
COIL BOX
COMBUSTIBLE
FLOORING
SHEET METAL
PLENUM
FLOOR
OPENING
Fig. 13 - - Furnace, Plenum, and Coil Assembly or
Coil Box Installed on a Combustible Floor
PLENUM OPENING
A
B
16
21--- 5/8
(406)
(549)
15--- 7/8
19
(403)
(483)
15--- 1/8
19
(384)
(483)
15--- 1/2
19
(394)
(483)
19--- 1/2
21--- 5/8
(495)
(549)
19--- 3/8
19
(492)
(483)
18--- 5/8
19
(473)
(483)
19
19
(483)
(483)
to suspend the furnace from each bottom corner. To prevent
screws from pulling out, use 2 #8 x 3/4- -in. (19 mm) screws into
the side and 2 #8 x 3/4- -in. (19 mm) screws in the bottom of the
furnace casing for each strap. (See Fig. 15 and 16) If the screws
are attached to ONLY the furnace sides and not the bottom, the
straps must be vertical against the furnace sides and not pull away
from the furnace sides, so that the strap attachment screws are not
in tension (are loaded in shear) for reliable support.
Platform Furnace Support
Construct working platform at location where all required furnace
clearances are met. (See Fig. 2 and 17) For furnaces with 1- -in.
(25 mm) clearance requirement on side, set furnace on
noncombustible blocks, bricks or angle iron. For crawl space
installations, if the furnace is not suspended from the floor joists,
the ground underneath furnace must be level and the furnace set
on blocks or bricks.
Roll- -Out Protection
Provide a minimum 17- -3/4 in. x 22 in. (451 mm x 559 mm)
piece of sheet metal for flame roll- -out protection in front of
burner area for furnaces closer than 12 inches (305 mm) above
the combustible deck or suspended furnaces closer than 12 inches
(305 mm) to joists. The sheet metal MUST extend underneath the
furnace casing by 1 in. (25 mm) with the door removed.
OR
A08556
FLOOR OPENING
C
D
16--- 5/8
22--- 1/4
(422)
(565)
16--- 1/2
19--- 5/8
(419)
(498)
16--- 3/4
20--- 5/8
(425)
(600)
16--- 1/2
20
(419)
(508)
20--- 1/8
22--- 1/4
(511)
(565)
20
19--- 5/8
(508)
(498)
20--- 1/4
20--- 5/8
(514)
(600)
20
20
(508)
(508)
441 01 1501 04
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