United States Stove 1600M manual Installation No, Return Air Is Very Important, Combustion Air

INSTALLATION NO. 2 INSTALLATION NO. 3

Extending the hot air duct from the furnace into the existing plenum will help direct the flow of air from the 1600M as well as the flow in the existing furnace. Ducting entering the existing plenum at an angle (approximately 45 degrees) will facilitate air flow from the furnace while diverting air from the existing furnace.

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.

HOTBLASTEXISTING

FURNACEFURNACE

BAFFLE

HOTBLASTEXISTING

FURNACEFURNACE

		2" MIN.
1" MIN.	9 FEET			9 FEET	1" MIN.
		HOT AIR
		PLENUM
	EXISTING		HOTBLAST
	FURNACE		FURNACE
	(if used)

HOT AIR DUCT

MINIMUM CLEARANCES

TO COMBUSTIBLES

RETURN AIR IS VERY IMPORTANT

When installing a Clayton Furnace, return air must be incorpo- rated 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 manufactured U.S. Stove filter box or an equivalent fabricated from sheet metal (See pages 22-23).

When installing a cold air return, the following minimum size should be maintained to insure proper furnace performance.

Model 1600M — 16" x 20" or equivalent (320 sq. in.)

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 1600M could depressurize the room and pull toxic flue gases from the furnace, a gas water heater, or gas furnace. The fumes could then be distributed throughout the house.

CAUTION: The warm air supply outlet of the supplementary furnace should not be connected to the cold-air return inlet of the central furnace because a possibility exists of components of the central furnace overheating causing it not to operate properly.

INCORRECT

INSTALLATION

NO RETURN

AIR PROVIDED

HOTBLASTEXISTING

FURNACEFURNACE

COMBUSTION AIR

All fires need air (specifically oxygen) to burn. Furnaces, fire- places, and wood-burning furnaces need enough oxygen for complete combustion of their fuels. The incomplete combustion that takes place when a furnace is "air starved" causes carbon monoxide (CO) to be formed in quantities that can be dangerous inside a well-sealed house. Having a source of combustion air from outside prevents this "air starvation" of the furnace. A simple positive air supply can be constructed using dryer vent and a

modified termination.

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