IO137 9
Note: When a combination of outdoor and indoor air is used the system should be designed and
adjusted so that the temperature reaching the appliance will not drop below 50
o
F during heating
operation. When this type of system is used the volume of air must not be reduced.
Plenum chambers and air ducts must be installed in accordance with the Standard for the Installa-
tion of Air Conditioning and Ventilating Systems, NFPA # 90A, or the Standard for the Installation
of Warm Air Heating and Air Conditioning Systems, NFPA # 90B.
If installed in parallel with a cooling unit, the damper or other means used to control the flow of air
must be adequate to prevent chilled air from entering the furnace. If manually operated, must be
equipped with means to prevent operation of the other unit unless the damper is in the full heat or
cool position.
NOTE: UPON INITIAL START-UP SOME SMOKE OR AN ODOR MAY BE PRESENT. THIS IS
NORMAL AND SHOULD DISAPPEAR IN A SHORT AMOUNT OF TIME. IT IS RECOMMENDED
THAT THE DOORS AND WINDOWS BE OPENED UPON INITIAL START-UP TO VENT THE
BUILDING OF THIS NON TOXIC, NON STAINING SMOKE.
CAUTION
One of the most common causes of problems, including premature heat exchanger failure, in
forced air heating systems is insufficient return air.
The return air duct system to the furnace should be approximately equal to or greater than the area
of the warm air discharge. Embosses are provided on the sides of the furnace to act as guidelines
for this purpose.
Consult local codes for specific requirements.
The blower speed should be adjusted to maintain the temperature rise range shown on the rating
plate.
The total static pressure should not exceed 0.50” W.C.
WARNING
NEVER ALLOW THE PRODUCTS OF COMBUSTION, INCLUDING CARBON MONOXIDE, TO
ENTER THE RETURN DUCTWORK OR CIRCULATING AIR SUPPLY. ALL CIRCULATING AIR
DUCTS MUST BE ADEQUATELY SECURED TO THE FURNACE AND COMPLETELY SEALED
AIRTIGHT USING APPROVED CONNECTIONS. THE VENT AND COMBUSTION AIR SUPPLY
PIPES MUST BE PROPERLY INSTALLED AND SUPPORTED TO PREVENT LEAKAGE AS
NOTED ELSEWHERE IN THESE INSTRUCTIONS. WHEN A FURNACE IS MOUNTED ON A
PLATFORM IT MUST BE SEALED AIRTIGHT BETWEEN THE FURNACE AND RETURN
DUCTWORK. THE FLOOR OR PLATFORM MUST PROVIDE SOUND PHYSICAL SUPPORT
FOR THE FURNACE WITHOUT CRACKING, GAPS, SAGGING ETC. AROUND THE BASE AS
TO PROVIDE A SEAL BETWEEN THE SUPPORT AND THE BASE. THE BASE OR PLATFORM
MUST BE SEALED AIRTIGHT TO THE FLOOR.
FAILURE TO PREVENT PRODUCTS OF COMBUSTION FROM ENTERING THE RETURN AIR
SUPPLY MAY CAUSE SEVERE ILLNESS INCLUDING CARBON MONOXIDE POISONING OR
DEATH.
Install the return air to terminate through the base under the furnace. For installations where return
air ducts cannot be run under the floor, the return air supply may be taken from the side(s). The
solid bottom supplied on the furnace must remain in place.
When installed in the downflow position, on combustible material, a special sub-base must be in-
stalled for a heating only application. If a cooling coil is installed under the furnace the sub-base is
not necessary.
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