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Fan Timer Connections
DIP Switch
FUSE
25-23-41
7. Ductwork and Filter
Poison carbon monoxide gas hazard.
Do NOT draw return air from inside a closet or
utility room. Return air duct MUST be sealed to
furnace casing.
Failure to properly seal duct can result in death,
personal injury and/or property damage.
Installation
NOTE: Design and install air distribution system to comply with
Air Conditioning Contractors of America manuals and/or NFPA
pamphlets 90A and 90B or other approved methods that conform
to local codes and good trade practices.
2.
3.
When furnace supply ducts carry air outside furnace area,
seal return air duct to furnace casing and terminate duct
outside furnace space.
Install air conditioning cooling coil (evaporator) on outlet
side of furnace.
For furnaces installed without a cooling coil it is recom-
mended that the outlet duct be provided with a removable
access panel. This panel should be accessible when the
furnace is installed so the exterior of the heat exchanger
can be viewed for inspections. The access panel MUST be
sealed to prevent leaks.
If separate evaporator and blower units are used, install
good sealing dampers for air flow control. Chilled air going
through the furnace could cause condensation and shorten
the furnace life.
NOTE: Dampers (field supplied) can be either automatic or
manual. Manually operated dampers MUST be equipped with a
means to prevent furnace or air conditioning operation unless
damper is in the full heat or coo! position.
Poison carbon monoxide gas hazard.
Cool air passing over heat exchanger can cause
condensate to form resulting in heat exchanger
failure.
This could result in death, personal injury and/or
property damage.
Connections
NOTE: On upflow installations, return air can enter through either
side, both sides, orthe bottom. On horizontal or downflowinstalla-
tions the return air must enter through the knockout opening in the
lower panel of the furnace. Return air can not enter through rear
of the furnace. When the furnace is located in an area near or ad-
jacent to the living area, the system should be carefully designed
with returns to minimize noise transmission through the return
grille. Any blower moving a high volume of air will produce audible
noise which could be objectionable to when the unit is located
very close to living areas. It is advisable to route the return air
ducts under the floor or through the attic.
440 01 101004 [_
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