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FURNACE
(OR COIL CASING
WHEN USED)
DOWNFLOW
SUBBASE
SHEET METAL
PLENUM
Fig. 18—Furnace, Plenum, and Subbase Installed
on a Combustible Floor
A 3-IN. MINIMUM
CLEARANCE TO
COMBUSTION-AIR INTAKE
IS REQUIRED.
ANGLE
IRON OR
EQUIVALENT
(B)
(A) ROD LOCATION
USING DIMPLE
LOCATORS
(SEE DIMENSIONAL
DWG FOR
LOCATIONS)
(A) PREFERRED ROD LOCATION
(B) ALTERNATE ROD LOCATION
A78651
COMBUSTION-AIR
INTAKE
(B)
(A)
3
/
-IN. HEX NUT
(A)
8
& WASHER (4)
REQD PER ROD
NOTES:
Fig. 19—Crawlspace Horizontal Application
16
Step 4—Installation in Horizontal Applications
These furnaces can be installed horizontally in either horizontal
left or right discharge position. In a crawlspace, furnace can either
be hung from floor joist or installed on suitable blocks or pad.
Furnace can be suspended from each corner by hanger bolts and
angle iron supports. (See Fig. 19.) Cut hanger bolts (4 each 3/8-in.
all-thread rod) to desired length. Use 1 X 3/8-in. flat washers,
3/8-in. lockwashers, and 3/8-in. nuts on hanger rods as shown in
Fig. 19. Dimples are provided for hole locations. (See Fig. 2.)
The entire length of furnace MUST be supported when
furnace is used in a horizontal position to ensure proper
draining.
Step 5—Filter Arrangement
Never operate unit without a filter or with blower access
panel removed.
VENT
"
3
5
⁄
4
DRAIN
(A)
(B)
13
/
-IN. MAX
16
(B)
ALTERNATE SUPPORT
LOCATION FROM BACK
1. A 1 In. clearance minimum between top of
furnace and combustible material.
2. The entire length of furnace must be
supported when furnace is used in
horizontal position to ensure proper
drainage.
3. Bottom side combustion-air entry cannot
be used when furnace is installed with
hangers as shown.
3
⁄
-IN. ROD
8
ALTERNATE SUPPORT
LOCATION 4-IN. MIN
8-IN. MAX
A96209
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