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1. Shut off the gas supply to the unit at the meter or at the
manual valve in the gas supply piping.
2. Turn off all power to the unit and set the thermostat to the
lowest temperature setting.
3. Remove the louvered access panel from the unit.
4. Turn the gas control knob (gas valve) to the OFF position.
for gas valve shut off instructions.
5. Disconnect the wires from the gas valve, ignitor, flame
sensor, combustion air motor, flame roll-out control, over-
temperature limit switch, and pressure switch.
6. Remove the silicone rubber tube from the collector pan to
the pressure switch.
7. Remove 4 nuts securing the combustion blower to the
collector pan. Remove the combustion blower.
8. Remove all screws securing the collector pan to the unit.
Remove the collector pan from the unit.
CAUTION:
To prevent damage to the unit or internal components,
it is recommended that two wrenches be used when
loosening or tightening nuts. Do not over tighten!
9. Using 2 wrenches, separate the ground-joint union in the
gas supply piping at the unit.
10. Remove the piping between the gas valve and the ground-
joint union, if necessary.
11. Remove the screws that secure the burner assembly in place
and the burner assembly.
BE EXTREMELY CAREFUL
NOT TO DAMAGE THE IGNITOR WHILE REMOVING
THE BURNER ASSEMBLY.
12. Attach a round wire brush to a length of high grade stainless
steel cable, such as drain clean-out cable. Attach the other
end of the spring cable to a variable speed reversible drill.
Slowly insert and rotate 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 sufficient cleaning. Repeat this process at
each exchanger tube.
13. Remove all loosened debris from the heat exchanger tubes
using high pressure air and vacuum cleaner.
14. Using a light, check the condition of the upper and lower
sections of the heat exchanger tube.
15. Inspect the burners and if necessary, clean them carefully
with a soft wire brush and/or the nozzle of a vacuum cleaner.
DO NOT DAMAGE THE IGNITOR OR FLAME SENSOR
WHILE CLEANING THE BURNER.
16. Replace all the parts in reverse order from which they were
removed.
17. Follow the operating instructions found on the right side
door and the User’s Information Manual to return the unit
to operation.
Cleaning of Burners
If the burners must be cleaned, follow the steps below.
1. Shut off the gas supply to the unit either at the meter or at
a manual valve in the supply piping.
2. Turn off all power to the unit and set the thermostat to the
lowest temperature setting.
3. Remove the louvered control access panel from the unit.
4. Turn the gas control knob to the OFF position. See
for gas valve shut off instructions.
5. Disconnect the wires from the gas valve, ignitor, and flame
sensor.
CAUTION:
Use care when removing parts from this unit.
Personal injury can result from sharp metal edges
present in all equipment of sheet metal construction.
Proper maintenance is important to achieve optimum
performance from the system. The ability to properly perform
maintenance on this equipment requires certain mechanical
skills and tools. If you do not possess these skills, contact your
dealer for maintenance. Consult your local dealer about the
availability of maintenance contracts. Routine maintenance
should include the following:
CAUTION:
The unit should never be operated without a filter
in the return air system. Replace disposable filters
with the same type and size.
• Inspect, clean or replace air filters at the beginning of each
heating and cooling season, or more frequently if required.
• Inspect the condensate drain and outdoor coil at the
beginning of each cooling season. Remove any debris.
Clean the outdoor coil and louvers as necessary using a
mild detergent and water. Rinse thoroughly with water.
• Inspect the electrical connections for tightness at the
beginning of each heating and cooling season.
• The blower compartment should be cleaned monthly during
the heating and cooling seasons to remove any dirt and lint
that may have accumulated in the compartment or on the
blower and motor. Buildup of dirt and lint on the blower and
motor can create excessive loads on the motor resulting in
higher than normal operating temperatures and possible
shortened service life.
• Maintain heat exchanger and burners. The unit should
operate for many years without excessive scale buildup in
the heat exchanger, however, the heat exchanger, the vent
system, and the burners should be inspected and cleaned
(if required) by a qualified serviceman annually to ensure
continued safe operation. Particular attention must be given
to identify deterioration from corrosion or other sources.
• The motors for the circulating air blower, outdoor fan, and
combustion blower are pre-lubricated at the factory. No
further oiling is required for the life of this product.
• Inspect and clean the screen of the vent cover assembly
at the beginning of each heating and cooling season.
Cleaning of Heat Exchanger
WARNING:
Holes in the heat exchanger can cause products
of combustion to enter the home. Replace the heat
exchanger if leaks are found. Failure to prevent
products of combustion from being circulated into
the living space can create potentially hazardous
conditions including carbon monoxide poisoning
that could result in personal injury or death.
If the heat exchanger must be cleaned due to soot or scale
build up, follow the steps below.
