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VII-MAINTENANCE
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.
At the beginning of each heating season, system should
be checked as follows by a qualified service technician:
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.
Filters
All SLP99UHV filters are installed external to the unit. Fil
-
ters should be inspected monthly. Clean or replace the fil
-
ters when necessary to ensure proper furnace operation.
See TABLE 40 for filter sizes.
IMPORTANT
If a highefficiency filter is being installed as part
of this system to ensure better indoor air quality,
the filter must be properly sized. Highefficiency
filters have a higher static pressure drop than
standardefficiency glass/foam filters. If the pressure
drop is too great, system capacity and performance
may be reduced.
The pressure drop may also cause the limit to trip
more frequently during the winter and the indoor
coil to freeze in the summer, resulting in an increase
in the number of service calls.
Before using any filter with this system, check the
specifications provided by the filter manufacturer
against the data given in the appropriate Lennox
Product
Specifications
bulletin.
Additional
information is provided in Service and Application
Note ACC002 (August 2000).
TABLE 40
Furnace
Cabinet Width
Filter Size
Side Return
Bottom Return
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)
24-1/2”
16 X 25 X 1 (2)
24 X 25 X 1 (1)
Exhaust and air intake pipes
Check the exhaust and air intake pipes and all connec-
tions for tightness and to make sure there is no blockage.
NOTE -
After any heavy snow, ice or frozen fog event the
furnace vent pipes may become restricted. Always check
the vent system and remove any snow or ice that may be
obstructing the plastic intake or exhaust pipes.
Electrical
WARNING
Electric Shock Hazard. Can cause injury or
death. Unit must be properly grounded in
accordance with national and local codes.
WARNING
Fire Hazard. Use of aluminum wire with this product
may result in a fire, causing property damage,
severe injury or death. Use copper wire only withthis
product.
CAUTION
Failure to use properly sized wiring and circuit
breaker may result in property damage. Size wiring
and circuit breaker(s) per Product Specifications
bulletin (EHB) and unit rating plate.
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__________
Condensate Hose Screens (FIGURE 60)
Check the condensate hose screens for blockage and
clean if necessary.
1 -
1 - Turn off power to the unit.
2 - Remove hoses from cold end header box. Twist
and pull screens to remove.
3 - Inspect screens and rinse with tap water if needed.
4 - Reinstall screens, reconnect hoses and turn on
power to unit.
