Fedders F80A - Manual (Page 21)

20
WARM AIR FURNACE
WARNING
DISCONNECT THE ELECTRICAL POWER SUPPLY TO THE
FURNACE BEFORE ATTEMPTING ANY MAINTENANCE.
FAILURE TO DO SO CAN CAUSE ELECTRICAL SHOCK
RESULTING IN PERSONAL INJURY OR LOSS OF LIFE.
CAUTION
Do not operate the furnace without an air filter.
WARNING
HOLES IN THE EXHAUST PIPING OR FURNACE HEAT
EXCHANGER CAN ALLOW TOXIC FUMES TO ENTER THE
HOME AND CIRCULATE THROUGH THE DUCT SYSTEM
RESULTING IN CARBON MONOXIDE POISONING OR
DEATH. IF LEAKS ARE FOUND IN THE FURNACE HEAT
EXCHANGER, IT MUST BE REPLACED.
CAUTION
Be careful when working on the burner assembly. The hot
surface igniter is fragile and can break easily.
MAINTENANCE
AIR FILTER
The filter should be inspected frequently and cleaned as
necessary. We recommend a monthly inspection at first,
perhaps coinciding with the arrival of the monthly fuel bill as
a reminder. The frequency may be increased or decreased
depending on experience and conditions.
LUBRICATION
Both the induced draft blower motor and circulating fan
motor are ball bearing type motors. Neither requires routine
lubrication.
IMPORTANT: The motor bearings were prelubricated by the
motor manufacturer. Do not attempt to lubricate them.
Excess lubrication will void the warranty, shorten the service
life of the motors, and will attract the buildup of dust and
dirt.
The induced blower motor and circulating fan motor must be
cleaned on a periodic basis by a qualified service technician.
Dust buildup in the ventilation ports of the motor will cause
the motor to not dissipate heat properly resulting in reduced
service life.
VENT CONNECTOR
The exhaust venting between the furnace vent box and
chimney should be inspected periodically for sags, pitting,
evidence of leakage etc. If any of these conditions exist,
contact your installation contractor, service agency or fuel
supplier.
OPERATING TIPS
1. Clean air filters maximize efficiency and reduce heating
costs.
2. During the heating season, keep windows and doors
closed to reduce the heating load on the system.
3. Avoid excessive use of kitchen exhaust hoods and other
exhaust fans to reduce the heating load on the system.
4. Arrange the furniture and drapes so that the supply air
registers and return air grilles are unobstructed.
5. If you have a perimeter duct system, ideally, the warm air
should bathe the cold exterior walls. Avoid the use of
plastic deflectors on the supply air registers that tend to
short circuit the warm air straight into the return air
grilles. These deflectors are often the cause of cool
draughts across the floor.
6. Avoid placing heat producing appliances such as
televisions, radios, lamps, etc. in a location to influence
the thermostat.
7. Keep combustible articles at least 3 feet away from the
furnace. Do not block access for servicing the furnace.
Do not use the vent connector as a hanger for clothes or
anything else.
8. Never attempt to operate the furnace without the
blower door in place.
ANNUAL INSPECTION / SERVICE
A qualified installation contractor, service agency or fuel
supplier must inspect the furnace annually.
Your annual inspection will normally cover the following:
HEAT EXCHANGER
The heat exchanger should be inspected for corrosion. The
flue passages (heat exchanger tubes) should be free of scale
or excessive corrosion. Observe the burner flames. If there
appears to be flame distortion, check venting for blockage.
Also check for signs of inadequate combustion air supply. If
flame distortion continues after eliminating the blockage in
the venting as the cause, it may be necessary to replace the
tubular heat exchanger. The tubular heat exchanger cannot
be field cleaned. If the tubular heat exchanger is blocked by
soot or excess scale, replace it. Check NOX baffles (installed in
heat exchanger tubes) for any distortion. If distorted, replace
NOX baffles.
BURNERS
The burners should be inspected to ensure that they are free
of deterioration, dust and debris, and properly aligned with
the heat exchanger. In most cases, a simple vacuuming with a
brush attachment will adequately clean the burner assembly
and burner compartment.
The flame sensor should be inspected and cleaned with fine
steel wool or Scotch-Brite™ scrubbing pad. The wiring
connection should be checked to ensure that it is tight and
corrosion free.
NOTE: This is a critical connection. Small amounts of corrosion
can significantly increase the internal resistance of the
connection. A relatively small increase in resistance can result
in a large decrease in flame signal.