GM9C96 Service Manual
SCHEDULED MAINTENANCE
18
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The furnace should be inspected by a qualied installer, or
service agency at least once per year. This check should be
performed at the beginning of the heating season. This will
ensure that all furnace components are in proper working
order and that the heating system functions appropriately. Pay
particular attention to the following items. Repair or service
as necessary.
• • Flue pipe system. Check for blockage and/or leakage.
Check the outside termination and the connections at
and internal to the furnace.
• • Combustion air intake pipe system (where applicable).
Check for blockage and/or leakage. Check the outside
termination and the connection at the furnace.
• • Heat exchanger. Check for corrosion and/or buildup
within the heat exchanger passageways.
• • Burners. Check for proper ignition, burner ame, and
ame sense.
• • Drainage system. Check for blockage and/or leakage.
Check hose connections at and internal to furnace.
• • Wiring. Check electrical connections for tightness and/
or corrosion. Check wires for damage.
• • Filters.
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Filters must be used with this furnace. Filters do not ship
with these furnaces but must be provided by the installer for
proper furnace operation.
Remember that dirty lters are the most common cause of
inadequate heating or cooling performance.
Improper lter maintenance is the most common cause of
inadequate heating or cooling performance. Filters should
be cleaned (permanent) or replaced (disposable) every two
months or as required. It is the owner’s responsibility to keep
air lters clean. When replacing a lter, it must be replaced
with a lter of the same type and size.
Depending on the installation, diering lter arrangements
can be applied. Filters can be installed in the central return
register, the bottom of the blower compartment (upow only).
A media air lter or electronic air cleaner can be used as an
alternate lter. The lter sizes given in the Product Design
section of this manual or the product Specication Sheet must
be followed to ensure proper unit performance. Refer to the
following information for removal and installation of lters.
Follow the manufacturer’s directions for service.
Filters in horizontal installations are located in the central
return register.
The bearings in the induced draft blower and circulator blower
motors are permanently lubricated by the manufacturer. No
further lubrication is required. Check motor windings for
accumulation of dust which may cause overheating. Clean
as necessary.
The drain tubes, standpipe, and eld supplied drain line must
be checked annually and cleaned as often as necessary to
ensure proper condensate drainage.
Under some conditions, the fuel or air supply can create a
nearly invisible coating on the ame sensor. This coating acts
as an insulator, causing a drop in the ame sensing signal. If
this occurs, a qualied servicer must carefully clean the ame
sensor with steel wool.
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