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NOTE - Use replacement filters that are similar in size
and efficiency ratings to those originally provided by the
installing contractor. Use of replacement filters with higher
filtration ratings may restrict air flow to the furnace. This
may result in reduced unit efficiency, as well as premature
blower motor failure.
A filter must be in place when the unit is operating.
TABLE 1
Furnace Cabinet Width
Filter Size
B (17-1/2”)
16 x 25 x 1 (1)
C (21-1/2”)
Maintenance
A licensed professional service technician (or equivalent)
should inspect the complete system each season (heat-
ing and cooling). The following maintenance procedures
should only be conducted by a licensed professional ser-
vice technician (or equivalent). Do not attempt to service
the unit in any way.
WARNING
ELECTRICAL SHOCK, FIRE,
OR EXPLOSION HAZARD.
Failure to follow safety warnings exactly could result in
dangerous operation, serious injury, death or property
damage.
Improper maintenance could result in dangerous
operation, serious injury, death, or property damage.
Before performing maintenance disconnect all electrical
power to furnace.
CAUTION
To ensure proper operation, a licensed professional
service technician (or equivalent) should check the
burner flame and conduct a combustion analysis
annually.
Annually (before heating season) inspect furnace venting
system, vent cap, heat exchanger, and burners for cor-
rosion, deterioration, or deposits of debris. Remove any
obstructions.
Inspect the furnace for obvious signs of deterioration.
Inspect the furnace venting system to make sure it is in
place, physically sound, and without holes, corrosion, or
blockage.
Vent pipe must be clear and free of obstructions and must
slope upward away from the furnace.
Inspect the furnace return air duct connection to ensure
duct is sealed to the furnace and terminates outside the
space containing the furnace.
Inspect the physical support of the furnace to guarantee
that it is sound without sagging, cracks or gaps around
base and it maintains seal between base and support.
Inspect the condensate drain and trap for leaks and
cracks. The drain and trap must also be cleaned and the
trap must be filled with water.
During a seasonal check the service technician will con-
duc a combustion analysis. The technician will also in-
spect the indoor blower, burner flames, electrical connec
-
tions and the venting system.
Blower
Check the blower wheel for debris and clean if necessary.
The blower motors are prelubricated for extended bearing
life. No further lubrication is needed.
WARNING
The blower access panel must be securely in place when
the blower and burners are operating. Gas fumes, which
could contain carbon monoxide, can be drawn into living
space resulting in personal injury or death.
Electrical
1 - Check all wiring for loose connections.
2 - Check for the correct voltage at the furnace (furnace
operating).
3 - Check amp-draw on the blower motor.
Motor Nameplate__________Actual__________
Service Reminder
Call your Lennox service technician if the unit will not op-
erate. Before calling, always check the following to be
sure service is required:
1 - Check that electrical disconnect switches are ON.
2 - Check room thermostat for proper setting.
3 - Replace any blown fuses or reset circuit breakers.
4 - Gas valve should be ON.
5 -
Air filter should not be plugged, which will limit air
flow.
6 - Is gas turned on at meter?
7 - Is manual main shut-off valve open?
Record the model and serial number of the furnace. These
numbers are on the unit nameplate, which is located on
the blower deck below the combustion air inducer.
Serial Number __________________
Model Number __________________
