18
Cleaning of Burners
If the burners must be cleaned, follow steps 1-12. Refer
to Figure 18 (page 27) for component locations.
1. Shut off gas supply to the furnace at the meter or at
a manual valve in the supply piping.
2. Turn off all power to the furnace and set the thermostat
to its lowest setting.
3. Remove the burner door from the furnace.
4. Turn the gas control switch to the OFF position.
CAUTION:
Label all wires prior to disconnection when
servicing controls. Wiring errors can cause
improper and dangerous operation.
5. Disconnect the wires from the gas valve, igniter, fl ame
sensor, and fl ame rollout switch.
6. Using two wrenches, separate the ground-joint union
in the gas supply piping at the furnace.
7. Remove the piping between the gas valve and the
ground-joint union. (If applicable).
8. Remove all screws securing the burner assembly to
the furnace.
9. Carefully remove the burner assembly from the furnace.
DO NOT DAMAGE THE IGNITER WHILE REMOVING
THE BURNER ASSEMBLY.
10. Inspect the burners for accumulated dust or debris.
If necessary carefully clean them with a soft wire
brush and a vacuum cleaner.
DO NOT DAMAGE THE
IGNITER WHILE CLEANING THE BURNER.
11. Replace all the parts in reverse order that they were
removed.
12. Follow the lighting instructions found on the furnace
door to return the furnace to operation. Verify proper
operation after servicing.
Cleaning Of Flue Passages
If the fl ue passages must be cleaned, follow the steps
below. Refer to Figure 18 for component locations.
1. Shut off the gas supply to the furnace either at the meter
or at the manual valve in the gas supply piping.
2. Turn off all power to the furnace and set the thermostat
to the lowest temperature setting.
3. Remove the blower door from the furnace.
4. Turn the gas control switch to the OFF position.
5. Disconnect the wires from the gas valve, fl ame sensor,
inducer, fl ame roll-out switch, limit switch, pressure
switch and igniter.
6. Remove the silicone rubber tube from the inducer.
7. Using two wrenches, separate the ground-joint union
in the gas supply piping at the furnace.
8. Remove the piping between the gas valve and the
ground-joint union. (If applicable).
9. Remove all screws securing the burner assembly to
the furnace.
10. Carefully remove the burner assembly from the
furnace.
DO NOT DAMAGE THE IGNITER WHILE
REMOVING THE BURNER ASSEMBLY.
11. Remove all screws securing the inducer assembly
to the vent pipe running out of the furnace.
12. Remove all screws securing the inducer assembly
to the collector pan.
13. Carefully remove the inducer assembly and
combustion tube assembly from the furnace.
14. Remove all screws securing the collector pan to the
furnace.
15. Remove the collector pan and gasket from the
furnace.
16. Attach a round wire brush to a length of high grade
stainless steel cable. Attach the other end of the
cable to a variable speed reversible drill. Slowly insert
the cable into the top portion of the heat exchanger.
Operate the drill alternating between forward and
reverse, working the cable in and out several times
to obtain suffi cient cleaning. Repeat this sequence
for each heat exchanger tube.
17. Remove all loosened debris from the heat exchanger
tubes using a vacuum cleaner.
18. Using a bright light, check the condition of the upper
and lower sections of the heat exchanger tubes.
19. Inspect the burners for accumulated dust or debris.
If burners must be cleaned, see Cleaning of Burners
section.
20. Replace all the parts in reverse order that they were
removed.
21. Check gaskets for damage and replace if needed.
22. Follow the lighting instructions found on the furnace
door to return the furnace to operation. Verify proper
operation after servicing.
Lubrication
The bearings in the blower motor and inducer blower used
in these furnaces are pre-lubricated and sealed by the
manufacturer. No further oiling of the bearings is required
for the life of the motor.
Heat Exchanger and Burner Maintenance
The furnace should operate for many years without
soot buildup in the fl ue passageways, however, the fl ue
passageways, the vent system, and the burners should be
inspected and cleaned (if required) by a qualifi ed service
technician annually to ensure continued safe operation.
Particular attention must be given to identify deterioration
from corrosion or other sources.
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