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SCREW
SENSOR
GASKET
NOTE: Location of flame sensor, igniter and
burner limit switch may vary depending on the
model.
Induced Draft and Circulator Blowers
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.
Condensate Trap and Drain System
(Qualified Servicer Only)
Annually inspect the drain tubes, drain trap, and field-
supplied drain line for proper condensate drainage. Check
drain system for hose connection tightness, blockage, and
leaks. Clean or repair as necessary.
IGNITOR
GASKET
LIMIT
GASKET
BURNER BOX
Burner Box
Figure 52
Flame Sensor (Qualified Servicer Only)
Under some conditions, the fuel or air supply can create a
nearly invisible coating on the flame sensor. This coating
acts as an insulator causing a drop in the flame sense
signal. If the flame sense signal drops too low the furnace
will not sense flame and will lock out. The flame sensor
should be carefully cleaned by a qualified servicer using
emery cloth or steel wool. Following cleaning, the flame
sense signal should be above 3 micro amps.
Flue Passages (Qualified Servicer Only)
The heat exchanger flue passageways should be inspected
at the beginning of each heating season.
BEFORE LEAVING AN INSTALLATION
• Cycle the furnace with the thermostat at least three
times. Verify cooling and fan only operation.
• Review the Owner's Manual with the homeowner and
discuss proper furnace operation and maintenance.
• Leave literature packet near furnace.
REPAIR AND REPLACEMENT PARTS
• 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
Gas Manifold
Natural Gas Orifice
Igniter
Flame Sensor
Burner Temperature Switch
Primary Limit Switch
Coil Front Cover
Auxiliary Limit Switch
Transformer
Door Switch
Induced Draft Blower
Heat Exchanger with Recuperator Coil
36
Blower Motor
Blower Wheel
Blower Mounting Bracket
Blower Cutoff
Blower Housing
Pressure Switches
Burner Assembly
Drain Trap
Burner Box Gasket
Integrated Control Module
Pressure Sensor
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