21
BURNER IGNITION
Unit is equipped with a direct spark ignition 100 percent
lockout system. Ignition module is located in the control box
(See Fig. 15).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 Gas Train
To remove the 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. 16).
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. 15).
8. Slide the burner rack out of the unit (See Fig. 15 and
18).
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.
FIGURE 15
Blower Housing and Flue Collector Box
INDUCED DRAFT MOTOR MOUNT
FLUE
COLLECTOR
BOX
BLOWER
HOUSING
BURNER
RACK
MOUNTING
SCREW
ROLLOUT
SWITCH
IGNITION MODULE
FIGURE 16
Unit Access Panel
FRONT
ACCESS PANEL
FIGURE 17
Removal of Motor and Blower Wheel
BLOWER
HOUSING
2 SETSCREWS
(HIDDEN)
