1.Removetheinduced-draftblowerassemblyaccordingto
directionsbelow.
2.Removethefluecollectorboxcover(SeeFig.18)fromthe
heatexchangerassembly.Inspecttheheatexchangers.
3.Cleanallsurfaces,asrequired,usingawirebrush.
INDUCED-DRAFT (COMBUSTION AIR) BLOWER
ASSEMBLY
The induced-draft blower assembly consists of the inducer motor.
the blower housing, and the induced-draft blower wheel.
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 induced-draft blower assembly as follows:
1. Remove unit access panel (See Fig. 19).
2. Remove the 7 screws that attach induced-draft motor
assembly to the flue collector box cover.
3. Slide the assembly out of the unit. (See Fig. 20). Clean the
blower wheel. If additional cleaning is required, continue
with Steps 4 and 5.
4. To remove blower wheel, remove 2 setscrews.
5. To remove inducer motor, remove screws that hold the
inducer motor to the blower housing.
6. To reinstall, reverse the procedure outlined above.
LIMIT SWITCH
Remove unit access panel. Limit switch is located on the blower
partition.
NOTE: Some models have two limit switches.
BURNER IGNITION
Unit is equipped with a direct spark ignition 100 percent lockout
system. Ignition module is located in the control box (See Fig. 18).
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.
Removal of Burner Assembly
To remove the burner assembly for servicing:
1. Shut off main gas valve.
2. Shut off power to unit and install lockout tag.
3. Remove unit access panel (See Fig. 19).
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. 18).
8. Slide the burner rack out of the unit (See Fig. 18 and 21).
9. To reinstall, reverse the procedure outlined above.
OUTDOOR COIL. INDOOR 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 trough with
clear water. Do not splash water on the insulation, motor, wiring, or
air filter(s). If the drain trough is restricted, clear it with a "plumbers
snake" or similar probe device.
IGNITION MODULE INDUCED DRAFT MOTOR MOUNT
\ !
¢
ROLLOUT
\ SWITCH
BURNER MOUNTING
COLLECTOR BLOWER
BOX HOUSING RACK SCREW
Fig. 18 - Blower Housing and Flue Collector Box
A05119
FRONT
ACCESS PANEL
24
Fig. 19 - Unit Access Panel
C99091
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