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Safety Precautions
If you discover any of the following, shut down your
unit, and contact a Lennox dealer for an inspection by
a licensed professional service technician (or equiv-
alent).
•
If you repeatedly hear any new or unfamiliar sounds
while your unit is operating, there may be a prob-
lem. For example, poorly performing burners can
produce unfamiliar noises.
•
If you smell any unusual odors, your unit may be
operating improperly. For example, units can give
off unfamiliar odors if components are required to
operate in abnormal conditions.
•
Look for visible signs of a malfunctioning unit. Ex-
amples include unusual amounts of condensate on
windows inside your house, visibly burnt compo-
nents or unusual dirt or rust accumulations on the
vent pipe or in the unit.
•
If you experience headache, nausea, fatigue, or
dizziness, the cause could be exposure to carbon
monoxide gas. This is often misdiagnosed as the
flu because symptoms are similar. If you suffer from
flu-like symptoms that are exaggerated at home,
but seem to subside while you are away from the
house, exposure to carbon monoxide could be the
cause.
Your vigilance may pay off in early detection of a problem
before either personal injury or property damage occurs.
Do not hesitate to contact a qualified service technician as
an investment in your well being.
WARNING
Do not use this furnace if any part has been
underwater. A flood-damaged furnace is extremely
dangerous. Attempts to use the furnace can result
in fire or explosion. Immediately call a licensed
professional service technician (or equivalent) to
inspect the furnace and to replace all gas controls,
control system parts, and electrical parts that
have been wet or to replace the furnace, if deemed
necessary.
Planned Service
Annual Furnace Maintenance
At the beginning of each heating season, and to comply
with the Lennox Limited Warranty, your system should
be checked as follows by a licensed professional service
technician (or equivalent).
1 - Check wiring for loose connections, voltage at
indoor unit and amperage of indoor motor.
2 - Check the condition of the belt and shaft bearings
if applicable.
3 - Inspect all gas pipe and connections for leaks.
4 - Check the cleanliness of filters and change if
necessary (monthly).
5 - Check the condition and cleanliness of burners and
heat exchanger and clean if necessary.
6 - Check the cleanliness of blower assembly and
clean the housing, blower wheel and blower motor
if necessary
7 - . Inspect the combustion air inducer and clean if
necessary.
8 - Evaluate the heat exchanger integrity by inspecting
the heat exchanger per the AHRI heat exchanger
inspection procedure. This procedure can be
viewed at www.ahrinet.org
9 - Ensure sufficient combustion air is available to the
furnace. Fresh air grilles and louvers (on the unit
and in the room where the furnace is installed)
must be properly sized, open and unobstructed to
provide combustion air.
10 - Inspect the furnace venting system to make sure
it is in place, structurally sound, and without holes,
corrosion, or blockage. Vent system must be free
and clear of obstructions and must slope upward
away from the furnace . Vent system should be
installed per the National Fuel Gas Code
11 - Inspect the furnace return air duct connection to
ensure the duct is sealed to the furnace. Check for
air leaks on supply and return ducts and seal where
necessary.
12 - Check the condition of the furnace cabinet insulation
and repair if necessary.
13 - Perform a complete combustion analysis during the
furnace inspection to ensure proper combustion
and operation. Consult Service Literature for proper
combustion values.
14 - Verify operation of CO detectors and replace
batteries as required.
Perform a general system test. Turn on the furnace to
check operating functions such as the start-up and shut-
off operation.
1 - Check the operation of the ignition system, inspect
and clean flame sensor. Check microamps before and
after. Check controls and safety devices (gas valve,
flame sensor, temperature limits). Consult Service
Manual for proper operating range. Thermal Limits
should be checked by restricting airflow and not
disconnecting the indoor blower. For additional details,
please see Service and Application Note H049.
2 - Verify that system total static pressure and airflow
settings are within specific operating parameters.
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