Fan Timer Connections
Fuse
25-22-68
9. Ductwork and Filter (Upflow/Horizontal)
Poison carbon monoxide gas hazard.
Do NOT draw return air from inside a closet or utility
room where furnace is located. Return air duct MUST
be sealed to furnace casing.
Failure to properly seal duct can result in death and/or
personal injury.
When the furnace is located in an area near or adjacent to the liv-
ing area, the system should be carefully designed with returns to
minimize noise transmission through the return air grille. Any
blower moving a high volume of air will produce audible noise
which could be objectionable when the unit is located very close
to a living area. It is often advisable to route the return air ducts
under the floor or through the attic.
• Refer to furnace Technical Support Manual (Blower Data)
for air flow information.
Duct Connections
This furnace may be installed in only a bottom or side return ap-
plication. Return air through the back of the unit is NOT allowed.
Side connections can be made by cutting out the embossed area
shown in Figure 16,
Cutting Side Return Air Opening
Starting
Hole
• Size ductwork to handle air flow for heating and air condition-
ing if used.
Duct InstallationRequirements
• When furnace supply ducts carry air outside furnace area,
seal return air duct to furnace casing and terminate duct out-
side furnace space.
• When a refrigeration coil is used in conjunction with this unit,
it must be installed on the discharge side of the unit to avoid
condensation on the heat exchanger.
If separate evaporator and blower unit is used, install good
sealing dampers for air flow control. Chilled air going through
the furnace could cause condensation and shorten furnace
life. Dampers (purchased locally) 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.
Bottom returns can be made by removing the knockout panel in
the furnace base. Do NOT remove knock-out except for a bottom
return.
Duct Design
Design and install air distribution system to comply with Air Condi-
tioning Contractors of America manuals or other approved meth-
ods that conform to local codes and good trade practices.
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 personal injury and/or death.
Installation of locking-type dampers are recommended in all
branches, or in individual ducts to balance system's air flow.
If air return grille is located close to the fan inlet, install at least
one, 90 ° air turn between fan and inlet grille to reduce noise.
441 012603 02
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