Page 5
TABLE 1
Furnace Cabinet
Width”
Filter Size
Side Return Bottom Return
14-1/2 16 X 25 X 1 (1) 14 X 25 X 1 (1)
17-1/2 16 X 25 X 1 (1) 16 X 25 X 1 (1)
21 16 X 25 X 1 (1) 20 X 25 X 1 (1)
Maintenance
CAUTION
As with any mechanical equipment, contact with sharp
sheet metal edges can result in personal injury. Take
care while handling this equipment and wear gloves and
protective clothing.
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 servicing could result in dangerous
operation, serious injury, death, or property
damage.
Before servicing, disconnect all electrical
power to furnace.
When servicing controls, label all wires prior
to disconnecting.
Take care to reconnect wires correctly. Verify
proper operation after servicing.
CAUTION
To ensure proper operation, a licensed professional
service technician (or equivalent) should check the
burner ame and conduct a combustion analysis
annually.
Annually (before heating season) inspect furnace venting
system, vent cap, heat exchanger and burners for corro-
sion, deterioration, or deposits of debris. Remove any ob-
structions.
Inspect the furnace venting system to make sure it is in
place, physically sound and without holes, corrosion, or
blockage. The vent connector must be correctly posi-
tioned and sloped upward. The vent connector must be
physically sound, without holes or excessive corrosion.
Inspect the furnace return air duct connection. The duct
must be sealed to the furnace and it must terminate out-
side the space containing the furnace.
Inspect the physical support of the furnace to guarantee
that it is sound. The support must not sag and must not
have cracks or gaps around the base of the furnace. There
must be a seal between the furnace base and the support.
During a seasonal check, the service technician will in-
spect the indoor blower and the burner ames along with
the venting system.
Blower
Check blower wheel for any debris and clean it, if nec-
essary. The blower motor is pre-lubricated for extended
bearing life. No further lubrication is needed.
WARNING
The blower door must be securely in place when the
blower and burners are operating. Gas fumes, which
could contain carbon monoxide, can be drawn into the
living space resulting in personal injury or death.
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 lter should not be plugged, which will limit air
ow.
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 below
the burners.
Serial Number ________________________________
Model Number ________________________________
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