INSTALLATION NO.1 | INSTALLATION NO. 2 |
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.
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
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BAFFLE
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HOT AIR DUCT
MINIMUM CLEARANCES
TO COMBUSTIBLES
existing plenum at an angle (approximately 45 degrees) will facilitate air flow from the furnace while diverting air from the existing furnace.
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
INCORRECT
INSTALLATIONWhen installing a cold air return, the following minimum size should be maintained to insure proper furnace performance.
NO RETURN
Model 1600 — 16" x 20" or equivalent
AIR PROVIDED
Model 1800
HOTBLASTEXISTING
Failure to provide return air ducts of the specified size
voids the furnace warranty.
FURNACEFURNACE
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
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
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