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WARNING
DISCONNECT MAIN ELECTRICAL
POWER TO THE UNIT BEFORE
ATTEMPTING ANY MAINTENANCE.
FAILURE TO DO SO CAN CAUSE
ELECTRICAL SHOCK RESULTING IN
PERSONAL INJURY OR DEATH.
FILTER MAINTENANCE
Have your qualified installer, service
agency or the gas supplier instruct you
on how to access your filters for
regular maintenance.
FILTERS
Filter application and placement are
critical to airflow, which may affect the
heating and cooling system
performance. Reduced airflow can
shorten the life of the system's major
components, such as motor, limits, heat
exchanger, evaporator coil or
compressor. Consequently, we
recommend that the return air duct
system have only one filter location.
The most common location will be
inside the furnace or a filter base. For
systems with a return air filter grille or
multiple filter grilles, can have a filter
installed at each of the return air
openings. Your HVAC professional can
show you where they have installed the
filter(s).
If high efficiency filters or electronic air
cleaners are used in the system, it is
important that the airflow is not reduced
to maximize system performance and
life. Always verify that the system's
airflow is not impaired by the filtering
system that has been installed, by
performing a temperature rise and
temperature drop test.
Keep the filter(s) clean at all times.
Vacuum dirt from filter, wash with
detergent and water, air dry thoroughly
and reinstall.
DO NOT DOUBLE FILTER THE
RETURN AIR DUCT SYSTEM. DO
NOT FILTER THE SUPPLY AIR DUCT
SYSTEM.
NOTE: Some filters must be resized to
fit certain units and applications. See
Table 16 and Figures 51 & 52.
1. 21" - 75,000(B), 90,000 & 105,000
BTUH units require removal of a
3.5-in. segment of filter and frame
to get the proper width for a side
filter.
2. 24.5" - 120,000 BTUH unit requires
removal of a 7" segment of filter
and frame to get the proper width
for a side filter.
CAUTION
DO NOT OPERATE THE SYSTEM
WITHOUT FILTERS. A PORTION OF
THE DUST ENTRAINED IN THE AIR
MAY TEMPORARILY LODGE IN THE
AIR DUCT RUNS AND AT THE
SUPPLY REGISTERS. ANY
RECIRCULATED DUST PARTICLES
WILL BE HEATED AND CHARRED
BY CONTACT WITH THE FURNACE
HEAT EXCHANGER. THIS RESIDUE
WILL SOIL CEILINGS, WALLS,
DRAPES, CARPETS AND OTHER
HOUSEHOLD ARTICLES AND MAY
RESULT IN UNPLEASANT ODORS.
LUBRICATION
IMPORTANT: DO NOT attempt to
lubricate the bearings on the blower
motor or the induced draft blower
motor. Addition of lubricants can reduce
the motor life and void the warranty.
The blower motor and induced draft
blower motor are permanently
lubricated by the manufacturer and do
not require further attention.
The blower motor and induced draft
blower motor must be cleaned
periodically by a qualified installer,
service agency, or the gas supplier to
prevent the possibility of overheating
due to an accumulation of dust and dirt
on the windings or on the motor
exterior. And, as suggested elsewhere
in these instructions, the air filters
should be kept clean. Dirty filters can
restrict airflow. The motor depends
upon sufficient air flowing across and
through it to keep from overheating.
SYSTEM OPERATION
INFORMATION
Advise The Customer
1. Keep the air filters clean. The
heating system will operate better,
more efficiently and more
economically.
2. Arrange the furniture and drapes
so that the supply air registers and
the return air grilles are
unobstructed.
3. Close doors and windows. This will
reduce the heating load on the
system.
4. Avoid excessive use of kitchen
exhaust fans.
5. Do not permit the heat generated
by television, lamps or radios to
influence the thermostat operation.
6. Except for the mounting platform,
keep all combustible articles 3 feet
from the furnace and vent system.
7. IMPORTANT: Replace all blower
doors and compartment covers
after servicing the furnace. Do not
operate the unit without all panels
and doors securely in place.
8. Explain proper operation of the
system.
ANNUAL INSPECTION
• The furnace should operate for many
years without excessive scale build-
up in the flue passageways. However,
it is recommended that a qualified
installer, service agency, or the gas
supplier annually inspect the flue
passageways, the vent system and
the main burners for continued safe
operation. Pay particular attention to
deterioration from corrosion or other
sources.
• IMPORTANT: It is recommended
that at the beginning and at
approximately half way through the
heating season, a visual inspection
be made of the main burner flames
for the desired flame appearance by
a qualified installer, service agency
or the gas supplier. If the flames are
distorted and/or there is evidence of
back pressure, check the vent and
inlet air system for blockage. If there
is carbon and scale in the heat
exchanger tubes, the heat
exchanger assembly should be
replaced.
WARNING
HOLES IN THE VENT PIPE OR
HEAT EXCHANGER CAN CAUSE
TOXIC FUMES TO ENTER THE
HOME, RESULTING IN CARBON
MONOXIDE POISONING OR
DEATH. THE VENT PIPE OR HEAT
EXCHANGER MUST BE
REPLACED IF THEY LEAK.
• IMPORTANT: It is recommended
that at the beginning of the heating
season, the flame sensor be
cleaned with steel wool by a
qualified installer, service agency or
the gas supplier.
• IMPORTANT: It is recommended
that at the beginning of the heating
season, the condensate trap be
inspected for debris or blockage and
be filled with water. A blocked
condensate trap can cause water to
back up into the primary heat
exchanger and lead to nuisance
tripping of the overtemperature
switches.
• IMPORTANT: It is recommended
that at the beginning of the heating
season, the condensate neutralizer
if used be replaced by a qualified
installer, service agency or the gas
supplier.
• IMPORTANT: It is recommended
that an annual inspection and
cleaning of all furnace markings be
made to assure legibility. Attach a
replacement marking, which can be
obtained through the distributor, if
any are found to be illegible or
missing.
TROUBLESHOOTING
Refer to Figure 53.
WIRING DIAGRAM
Figure 54 is a complete wiring
diagram for the furnace.
59
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