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COMBUSTION- -AIR BLOWER
Clean periodically to assure proper airflow and heating efficiency.
Inspect blower wheel every fall and periodically during the
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 required, remove
motor and wheel as follows:
1. Remove unit access panel (See Fig. 22).
2. Remove the 7 screws that attach induced- -draft motor
mounting plate to blower housing (See Fig. 23).
3. Slide the motor and blower wheel assembly out of the
blower housing (See Fig. 23). Clean the blower wheel. If
additional cleaning is required, continue with Steps 4 and
5.
4. To remove blower, remove 2 setscrews (See Fig. 23).
5. To remove motor and cooling fan assembly, remove 4
screws that hold blower housing to mounting plate.
6. To reinstall, reverse the procedure outlined above.
LIMIT SWITCH
Remove unit access panel. Limit switch is located on the blower
partition.
BURNER IGNITION
Unit is equipped with a direct spark ignition 100 percent lockout
system. Ignition module is located 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 by turning selector switch to
OFF position at the thermostat.
MAIN BURNERS
At the beginning of each heating season, inspect for deterioration
or blockage due to corrosion or other causes. Observe the main
burner flames and adjust, if necessary.
CAUTION
!
UNIT DAMAGE HAZARD
Failure to follow this caution may result in reduced unit and/or
component life.
Do Not redrill an orifice. Improper drilling (burrs,
out- -of- -round holes, etc.) can cause excessive burner noise
and misdirection of burner flame. Replace with correct sized
orifices.
REMOVAL OF GAS TRAIN
To remove the gas train for servicing:
1. Shut off main gas valve.
2. Shut off power to unit.
3. Remove unit access panel (See Fig. 22).
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 unit base (See Fig. 24).
8. Slide the burner rack out of the unit (See Fig. 21 and 24).
9. To reinstall, reverse the procedure outlined above.
CONDENSER COIL, EVAPORATOR COIL, AND
CONDENSATE DRAIN PAN
Inspect the condenser coil, evaporator coil, and condensate drain
pan at least once each year. The coils are easily cleaned when dry;
therefore, inspect and clean the coils either before or after each
cooling season. Remove all obstructions, including weeds and
shrubs, that interfere with the airflow through the condenser coil.
Straighten bent fins with a fin comb. If coated with dirt or lint,
clean the coils with a vacuum cleaner, using the soft brush
attachment. Be careful not to bend the fins. If coated with oil or
grease, clean the coils with a mild detergent- -and- -water solution.
Rinse coils with clear water, using a garden hose. Be careful not
to splash water on motors, insulation, wiring, or air filter(s). For
best results, spray condenser coil fins from inside to outside the
unit. On units with an outer and inner condenser coil, be sure to
clean between the coils. Be sure to flush all dirt and debris from
the unit base.
Inspect the drain pan and condensate drain line when inspecting
the coils. Clean the drain pan and condensate drain by removing
all foreign matter from the pan. Flush the pan and drain tube with
clear water. Do not splash water on the insulation, motor, wiring,
or air filter(s). If the drain tube is restricted, clear it with a
"plumbers snake" or similar probe device. Ensure that the
auxiliary drain port above the drain tube is also clear.
INDUCED DRAFT MOTOR MOUNT
VENT HOOD
FLUE
BLOWER
IN SHIPPING
COLLECTOR
HOUSING
LOCATION
BOX
Fig. 21 - - Blower Housing and Flue Collector Box
FRONT
ACCESS PANEL
Fig. 22 - - Unit Access Panel
23
ROLLOUT
SWITCH
BURNER
MOUNTING
RACK
SCREW
C99022
C99091
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