36
SCREW
SENSOR
GASKET
IGNITOR
GASKET
LIMIT
GASKET
BURNER BOX
Burner Box
Figure 52
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.
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
Blower Motor
Gas Manifold
Blower Wheel
Natural Gas Orifice
Blower Mounting Bracket
Igniter
Blower Cutoff
Flame Sensor
Blower Housing
Burner Temperature Switch
Pressure Switches
Primary Limit Switch
Burner Assembly
Coil Front Cover
Drain Trap
Auxiliary Limit Switch
Burner Box Gasket
Transformer
Integrated Control Module
Door Switch
Pressure Sensor
Induced Draft Blower
Heat Exchanger with Recuperator Coil
