Locating The Furnace - USSC Hotblast 1357M Owner's Manual

Locating the Furnace

1. The furnace should be located in the same
room as the central system and as close as
possible, but not closer than 9". There should
be no wall between the furnace and the warm
air outlet duct that is connected directly to the
warm air outlet plenum of the central furnace.
(See Fig. 4)
2. Place the furnace on a noncombustible floor.
3. Check figures 3 through 5. Be sure you have
the clearances shown below from the furnace
and the connector pipe to combustible sur-
faces. If you have a solid brick or stone wall
behind your furnace, you can place the furnace
as close as you wish to the wall. If the wall
is only faced with brick or stone, treat it as a
combustible wall.
Unit to Sidewall
Unit to Backwall
Front of Unit to
Combustible
Chimney Pipe
to Sidewall
Chimney Pipe
to Backwall
Plenum to
Combustibles
PLENUM
TO
6" MIN.
CEILING
1357M 1557M
12" 12"
(305mm) (305mm)
30" 30"
(760mm) (760mm)
48" 48"
(1.22m) (1.22m)
18" 21"
(460mm) (530mm)
18" 18"
(460mm) (460mm)
6" 6"
(150mm) (150mm)
2" MIN. AIR SPACE
REQUIRED BY CODE
CENTRAL
FURNACE
Figure 3
21"
12"
6" SOLID DAMPER
6" BAROMETRIC
DRAFT REGULATOR
NON-COMBUSTIBLE FLOOR
7
18"
6" CHIMNEY
CENTRAL
FURNACE
9"
48"
Figure 4
Figure 5
18"
18"