Operating instructions

HOUSING
2 SETSCREWS
(HIDDEN)
C99085
Fig. 29---Removal of Motor and Blower Wheel
C99086
Fig. 30_Burner Rack Removed
2. Remove the 3 screws holding die blower housing to die flue
collector box cover (See Fig. 27-30).
3. Remove the 12 screws holding the flue collector box cover
(See Fig. 29-30) to die heat exchanger assembly. Inspect the
beat exchangers.
4. Clean all surfaces, as required, using a wire brush.
COMBUSTION-AIR BLOWER
Clean periodically to assure proper airflow and heating efficiency.
Inspect blower wheel every fall and periodicaily during the heating
season. For the first heating sea.son, inspect blower wheel bi-
monthly 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. 28).
2. Remove the 7 screws that attach induced-draft motor mount-
ing plate to blower housing (See Fig. 29).
3. Slide the motor and blower wheel a._sembly out of the blower
housing (See Fig. 29). Clean the blower wheel. If additional
cleaning is required, continue with Steps 4 and 5.
4. To remove blower, remove 2 setscrews.
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 die 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 die thermostat.
MAIN BURNERS
At the beginning of each heating season, irtspect for deterioration
or blockage due to corrosion or other causes. Observe the main
burner flames and adjust, if necessary.
27
Removal of Gas Train
To remove die gas train 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. 28).
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. 27).
8. Slide die burner rack out of the unit (See Fig. 27 and 30).
9. To reinstall, reverse die 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 or more often if necessary.
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 die
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 die so_ brush
attachment. Be careful not to bend die 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 bose. Re careful not to
splash water on motors, insulation, wiring, or air l-alter(s). For best
results, spray condenser coil fins from inside to outside die unit.
On units with an outer and inner condenser coil, be sure to clean
between the coils. Be sure to flush ail dirt and debris from the unit
base.