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Maintenance
To maintain efficiency and longevity, your equipment
must be serviced yearly by a qualified service technician.
Failure to provide proof of proper service can void the
warranty.
WARNING
Electric shock hazard. Can cause
injury or death. Before attempting to
perform any service or maintenance,
turn the electrical power to unit OFF at
disconnect switch(es). Unit may have
multiple power supplies.
Filters
Filter(s) must be installed in the return air system. Filters
should be checked monthly and replaced when neces-
sary. Take note of air flow direction marking on filter frame
when reinstalling filters. Replace disposable or clean per-
manent type as necessary. DO NOT replace permanent
type with disposable.
NOTE − Filters must be U.L.C. approved or equivalent for
use in Canada.
Motors
All motors are permanently lubricated and require no
further lubrication. Motors should be cleaned yearly to
prevent the accumulation of dust and dirt on the windings
or motor exterior.
Coil
Dirt and debris should not be allowed to accumulate on
the coil surfaces or other parts in the air conditioning cir-
cuit. Cleaning should be performed as often as neces-
sary. Use a brush, vacuum cleaner attachment, or other
suitable means. If water is used to clean the coil, be sure
the power to unit is shut off prior to cleaning.
NOTE − Care should be used when cleaning the coil so
that the coil fins are not damaged.
Do not permit the hot condenser air discharge to be ob-
structed by overhanging structures or shrubs.
Burners
WARNING
Danger of explosion and fire. Can cause
injury or product or property damage.
Periodically inspect burner flame to en-
sure proper unit operation.
Inspect the burner flame periodically during heating sea-
son to ensure proper burner operation.
Light the burners and allow unit to operate for a few min-
utes to establish normal burning conditions. Observe the
burner flames. Flames should be predominantly blue in
color and strong in appearance. Verify that all burners
are lit and that the flame does not impinge on the sides of
the heat exchanger. See figure 3.
Distorted flame or yellow tipping of the natural gas
flame (or long yellow tips on LP/propane flame) may be
caused by one or more of the following: lint or dirt inside
the burner or burner ports; lint or dirt at the air inlet be-
tween the burner and manifold pipe; or an obstruction
over the burner orifice.
Use a soft brush or vacuum to clean the affected areas.
Typical Flame Appearance
Burner
Gas Manifold
Vent Outlet
Visually inspect vent outlet periodically to make sure that
the there is no buildup of soot and dirt . If necessary, clean
to maintain adequate opening to discharge flue products.
Service Reminder
Call a qualified service technician if the unit is inopera-
tive. Before calling, always check the following to be
sure service is required:
1 − Be sure 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 filters should not be plugged, limiting air flow.
6 − Make sure all access panels are in place.
Repair Parts List
The following repair parts are available through Lennox
dealers. When ordering parts, include the complete unit
model number listed on the unit rating plate.
CONTROL PANEL PARTS HEATING PARTS
Ignition control board
Contactor
Transformer
Capacitor
BLOWER PARTS
Blower wheel
Blower Motor
Motor mounting arm
Blower housing
COOLING PARTS
Compressor
Condenser fan motor/blades
Coils
Drain pan
Page 3
Heat Exchanger
Burner
Flame
(Blue Only)
Figure 3
Heat exchanger assembly
Combustion air inducer
Orifices
Burners
Gas valve
Manifold
Ignitor
Limit control
Rollout switch
Pressure switch
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