SCHEDULED MAINTENANCE
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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.
• Heat exchanger. Check for corrosion and/or buildup
within the heat exchanger passageways.
• Burners. Check for proper ignition, burner ame, and
ame sense.
• Wiring. Check electrical connections for tightness and/
or corrosion. Check wires for damage.
• Filters.
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.
Filters in horizontal installations are located in the central
return register or the ductwork near the furnace.
1. Turn OFF electrical power to furnace.
2. Remove filter(s) from the central return register or
ductwork.
3. Replace lter(s) by reversing the procedure for removal.
4. Turn ON electrical power to furnace.
Follow the manufacturer’s directions for service.
Visually inspect the burner ames periodically during the
heating season. Turn on the furnace at the thermostat
and allow several minutes for ames to stabilize, since any
dislodged dust will alter the ames normal appearance.
Flames should be stable, quiet, soft, and blue (dust may
cause orange tips but they must not be yellow). They
should extend directly outward from the burners without
curling, oating, or lifting o. Flames must not impinge on
the sides of the heat exchanger ring tubes.
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.
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 sense
signal. If the ame sense signal drops too low the furnace
will not sense ame and will lock out. The ame sensor
should be carefully cleaned by a qualied servicer using
steel wool. Following cleaning, the ame sense signal
should be as indicated in the Specications Sheet.
The heat exchanger ue passageways should be inspected
at the beginning of each heating season.
• When ordering any of the listed functional parts, be sure
to provide the furnace model, manufacturing, and serial
numbers with the order.
• Although only functional parts are shown in the parts
list, all sheet metal parts, doors, etc. may be ordered
by description.
• Parts are available from your distributor.
Functional Parts List-
Gas Valve Blower Motor
Gas Manifold Blower Wheel
Natural Gas Orice Blower Mounting Bracket
Propane Gas Orice Blower Cuto
Igniter Blower Housing
Flame Sensor Inductor
Rollout Limit Switch Heat Exchanger with
Primary Limit Switch Recuperator Coil
Auxiliary Limit Switch Coil Front Cover
Pressure Switch Integrated Control Module
Induced Draft Blower Transformer
Door Switch Bluetooth Module
Before attempting to diagnose an operating fault code, run
a Heating Performance Test to determine if the heating
system is performing within 5% of the BTU input found on
the rating plate of the unit being tested. To conduct a heating
performance test, the BTU input to the unit must be calculated
(see Clocking a Gas Meter). Before clocking a gas meter,
contact your local utility to provide the caloric value (BTU
content) of the natural gas in the area.
It is also important to conrm the airow (CFM) is within the
temperature rise range (see Airow Data in spec sheet) and
external static pressure range (approximately 0.5” water
column). How-to instructions can be found in the service
manual under Checking External Static Pressure and
Checking Temperature Rise.
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