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Combustion-Air Blower — Clean periodically to as-
sure proper airflow and heating efficiency. Inspect blower
wheel every fall and periodically during heating season. For
the first heating season, inspect blower wheel bimonthly to
determine proper cleaning frequency.
To inspect blower wheel, remove draft hood assembly. Shine
a flashlight into opening to inspect wheel. If cleaning is re-
quired, remove motor and wheel as follows:
1. Remove burner access panel. (See Fig. 35.)
2. Remove the 7 screws that attach induced-draft motor mount-
ing plate to blower housing. (See Fig. 34.)
3. Slide the motor and blower wheel assembly out of the
blower housing. (See Fig. 36.) Clean the blower wheel.
If additional cleaning is required, continue with Steps 4
and 5.
4. To remove blower, remove 2 setscrews. (See Fig. 36.)
5. To remove motor, remove 4 screws that hold blower hous-
ing to mounting plate. Remove the motor cooling fan by
removing one setscrew. Remove nuts that hold motor to
mounting plate.
6. To reinstall, reverse the procedure outlined above.
Limit Switch — Remove blower panel. Limit switch is
located on the gas partition.
Burner Ignition — Unit is equipped with a direct spark
ignition 100% lockout system. Ignition module is lo-
cated in the control box. Module contains a self-diagnostic
LED. During servicing, refer to label diagram for LED
interpretation.
If lockout occurs, unit may be reset by either momentarily
interrupting power supply to unit, or turning selector switch
to OFF position at the thermostat.
Main Burners — At the beginning of each heating sea-
son, inspect for deterioration or blockage due to corrosion or
other causes. Observe the main burner flames and adjust if
necessary.
When servicing gas train, do not hit or plug orifice spuds.
REMOVAL OF GAS TRAIN
1. Shut off manual gas valve.
2. Shut off power to unit.
3. Remove burner access panel. (See Fig. 35.)
4. Disconnect gas piping at unit gas valve.
5. Remove wires connected to gas valve. Mark each wire.
6. Remove ignitor and sensor wires at the ignitor module.
7. Remove the mounting screw that attaches the burner rack
to the basepan. (See Fig. 34.)
8. Slide the burner rack out of the unit. (See Fig. 34
and 37.)
9. To reinstall, reverse the procedure outlined above.
BURNER
ACCESS
PANEL
Fig. 35 — Burner Access Panel
BLOWER
HOUSING
2 SETSCREWS
(HIDDEN)
Fig. 36 — Removal of Motor and Blower Wheel
Fig. 37 — Burner Rack Removed
46