25
brush attached to a length of high grade
stainless steel cable, such as drain
cleanout cable. Attach variable speed
reversible drill to the other end of the spring
cable. Slowly rotate the cable with the drill
and insert it into the top portion of the heat
exchanger. While reversing the drill, work
the cable in and out several times to obtain
sufficient cleaning. Repeat this sequence
for each heat exchanger tubes.
14. When all heat exchanger tubes have been
cleaned, any debris inside the tubes can be
removed with the nozzle of a vacuum
cleaner.
15. With a light, check the condition of the
upper and lower sections of the heat
exchanger tube.
16. Inspect the burners and clean them (if
necessary) with a soft wire brush and/or
the nozzle of a vacuum cleaner. BE
EXTREMELY CAREFUL NOT TO
DAMAGE THE IGNITER WHILE
CLEANING THE BURNER.
17. Replace all the parts in reverse order from
which they were removed.
18. Follow the lighting instructions found on
the furnace door to return the furnace to
operation. Verify proper operation after
servicing.
Cleaning of Burners
If the burners must be cleaned, follow the steps
below. See Figure 14 for component location
and identification.
1.
Shut off the gas supply to the furnace
either 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 the lowest temperature
setting.
3.
Remove the upper louvered door from the
furnace.
4.
Turn the gas control lever to the OFF
position.
5.
Disconnect the wires from the gas valve,
igniter, and flame sensor.
6.
Using 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 necessary.
8.
Remove the screws that hold the burner
assembly in place and remove the burner
assembly. BE EXTREMELY CAREFUL
NOT TO DAMAGE THE IGNITER WHILE
REMOVING THE BURNER ASSEMBLY.
9.
Inspect the burners and clean them (if
necessary) with a soft wire brush and/or
the nozzle of a vacuum cleaner. BE
EXTREMELY CAREFUL NOT TO
DAMAGE THE IGNITER WHILE
CLEANING THE BURNER.
10. Replace all the parts in reverse order from
which they were removed.
11. Follow the lighting instructions found on
the furnace door to return the furnace to
operation. Verify proper operation after
servicing.
SYSTEM OPERATION INFORMATION
General
Proper maintenance is most important to
achieve the best performance from a furnace.
Follow these instructions for years of safe,
trouble free operation.
1.
Do not place combustible materials on or
against the furnace cabinet or within 6
inches of the vent pipe (or for B-vent use
the recommended clearance).
2.
Do not store gasoline or any other flammable
vapors and liquids in the vicinity of the
furnace.
3.
Change or replace the air filters monthly
during any period when the circulating
blower is operating regularly.
4.
Always replace the doors on the furnace
after servicing or cleaning/changing the
filters. Do not operate the furnace without
all doors and covers in place.
5.
Avoid operating the furnace when windows
and doors are open.
6.
Be sure that the thermostat is properly
installed and is not being affected by
drafts or heat from lamps or other
appliances.
