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V. COMBUSTION-AIR BLOWER
Clean periodically to assure proper airflow and heating effi-
ciency. Inspect blower wheel every fall and periodically dur-
ing 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
mounting 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 holdblower 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.
VI. LIMIT SWITCH
Remove blower panel. Limit switch is located on the gas
partition.
VII. BURNER IGNITION
Unit is equipped with a direct spark ignition 100% lockout
system. Ignition module is located in the control box. Module
contains a self-diagnostic LED. During servicing, refer to la-
bel 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.
VIII. MAIN BURNERS
At the beginning of each heating season, inspect for deterio-
ration or blockage due to corrosion or other causes. Observe
the main burner flames and adjust if necessary.
CAUTION:
When servicing gas train, do not hit or
plug orifice spuds.
A. 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
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