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INSTALLATION NO.1
With this installation, a back draft damper is inserted into the
heat run before the plenum of the existing furnace to prevent
air from the existing furnace to blow back into the furnace
when it is not in use. When a back draft damper is employed,
it should be located as close to the existing furnace plenum as
practical.
HOTBLAST
FURNACE
EXISTING
FURNACE
INSTALLATION NO. 2
Extending the hot air duct from the furnace into the existing
plenum will help direct the flow of air from the 1600/1800 as
well as the flow in the existing furnace. Ducting entering the
BAFFLE
HOTBLAST
FURNACE
EXISTING
FURNACE
existing plenum at an angle (approximately 45 degrees) will
facilitate air flow from the furnace while diverting air from the
existing furnace.
INSTALLATION NO. 3
The baffle on this system should be made the full width of the
furnace plenum in order to properly direct the air into the
distribution ducts.
RETURN AIR IS VERY IMPORTANT
When installing a Hotblast Furnace, return air must be
incorporated into the system. Return air can be provided by
installing a separate duct system or by tying into the cold air
return of an existing gas or oil furnace. The cold air return duct
can be connected to the furnace with either a factory manufac-
tured U.S. Stove filter box or an equivalent fabricated from
sheet metal (See pages 21-23).
When installing a cold air return, the following minimum
size should be maintained to insure proper furnace
performance.
Model 1600 — 16" x 20" or equivalent
Model 1800 --- 16" x 20" or equivalent
Failure to provide return air ducts of the specified size
voids the furnace warranty.
A filter should be installed in the cold air return. Furnace filters
should be checked and cleaned or replaced regularly.
If return air is not provided, the warm air distributed into your
home will be restricted and the efficiency of the furnace
decreased. Without a return air system, warm air will be drawn
into your basement, unnecessarily heating unused areas of
the home. In extreme cases, if your basement or utility room is
fairly air tight, the large blower on the 1600/1800 could
depressurize the room and pull toxic flue gases from the
NO RETURN
AIR PROVIDED
EXISTING
FURNACE
INCORRECT
INSTALLATION
4
HOTBLAST
FURNACE
EXISTING
FURNACE
(if used)
HOTBLAST
FURNACE
HOT AIR
PLENUM
2" MIN.
1" MIN.
1" MIN.
HOT AIR DUCT
MINIMUM CLEARANCES
TO COMBUSTIBLES
9 FEET
9 FEET