Page 7
EQUIPMENT IN CONFINED SPACE
ALL AIR FROM OUTSIDE
OUTLET AIR
INLET AIR
WATER
HEATER
CHIMNEY
OR GAS
VENT
FIGURE 5
NOTE-Each air duct opening shall have a free area of at least one
square inch per 2,000 Btu per hour of the total input rating of all
equipment in the enclosure. If the equipment room is located
against an outside wall and the air openings communicate directly
with the outdoors, each opening shall have a free area of at least
one square inch per 4,000 Btu per hour of the total input rating of all
other equipment in the enclosure.
G23
FURNACE
Installation - Setting Equipment
Select a location that allows for required clearances listed
on the unit rating plate. Also consider gas supply connec
tions, electrical supply, vent connection and installation
and service clearances [24 inches (610 mm) at unit front].
The furnace must be level.
NOTE - 1/3 and 1/2 hp blower motors are equipped with
either four flexible mounting legs or three flexible legs and
one rigid leg. The rigid leg is equipped with a shipping bolt
and a flat white plastic washer (rather than the rubber
mounting grommet used with a flexible mounting leg).
This shipping bolt and flat washer must be removed be-
fore the furnace is put into operation. Once the shipping
bolt and washer are removed, the rigid leg will not touch
the blower housing.
Return Air Opening Guidelines
WARNING
Blower door must be securely in place when blower
and burners are operating. Gas fumes, which could
contain carbon monoxide, can be drawn into living
space resulting in personal injury or death.
WARNING
Improper installation of unit can result in personal
injury or death. Combustion and flue products
must never be allowed to enter the return air system
or air in the living space. Use sheet metal screws
and joint tape to seal return air system to furnace.
In platform installations with furnace return, the fur
nace should be sealed airtight to the return air ple
num. A door must never be used as a portion of the
return air duct system. The base must provide a
stable support and an airtight seal to the furnace.
Allow absolutely no sagging, cracks, gaps, etc.
For no reason should return and supply air duct
systems ever be connected to or from other heating
devices such as a fireplace or stove, etc. Fire, ex
plosion, carbon monoxide poisoning, personal in
jury and/or property damage could result.
Return air can be brought in either side or at the bottom of
the unit. Scribe lines show the outline of each side and the
bottom return air opening.
Bottom Return Air Applications
If cold air return is to terminate through the floor under the
furnace, a direct, airtight and sealed connection must be
made to the bottom of the furnace.
1 - Cut opening in floor or platform. Using knockouts
provided, cut bottom of base panel. See figure 6.
FIGURE 6
KNOCKOUT PATTERN FOR BOTTOM RETURN
AIR APPLICATION
2 - Bend a flange on return air plenum and lower into
floor or platform opening. See figure 7.
3 - Position unit over return air opening. Seal unit air
tight with return air plenum.