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underneath furnace must be level and the furnace set on blocks or
bricks.
Roll--Out Pr
otection
Provide a minimum 17--3/4 in. X 22 in. piece of sheet metal for
flame roll--out protection in front of burner area for furnaces
closer than 12 inches above the combustible deck or suspended
furnaces closer than 12 inches to joists. The sheet metal MUST
extend underneath the furnace casing by 1 in. with the door
removed.
The bottom closure panel on furnaces of widths 17--1/2 in. and
larger may be used for flame roll--out protection when bottom of
furnace is used for return air connection. See Fig. 17 for proper
orientation of roll--out shield.
Bottom Return Air
Inlet
These furnaces are shipped with bottom closure panel installed in
bottom return--air opening. Remove and discard this panel when
bottom return air is used. To remove bottom closure panel,
perform the following:
1. Tilt or raise furnace and remove 2 screws holding bottom
filler panel. (See Fig. 9.)
2. Rotate bottom filler panel downward to release holding
tabs.
3. Remove bottom closure panel.
4. Reinstall bottom filler panel and screws.
Side Return Air
Inlet
These furnaces are shipped with bottom closure panel installed in
bottom return--air opening. This panel MUST be in place when
side return air inlet(s) are used without a bottom return air inlet.
PLENUM
OPENING
C
A
B
D
FLOOR
OPENING
A096283
Fig. 11 -- Floor and Plenum Opening Dimensions
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
FLOOR
OPENING
FURNACE
(OR COIL CASING
WHEN USED)
COMBUSTIBLE
FLOORING
A096285
Fig. 12 -- Furnace, Plenum, and Subbase installed on a
Combustible Floor
A04140
CD5 OR CK5
COIL ASSEMBLY
OR KCAKC
COIL BOX
FURNACE
SHEET METAL
PLENUM
FLOOR
OPENING
COMBUSTIBLE
FLOORING
A04140
Fig. 13 -- Furnace, Plenum, and Coil Assembly or Coil Box
Installed on a Combustible Floor
312A