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Unitary Products 25
MAINTENANCE
NORMAL MAINTENANCE
Periodic maintenance normally consists of changing or clean-
ing filters and (under some conditions) cleaning the main
burners
FILTERS
Inspect once a month. Replace disposable or clean perma-
nent type as necessary. DO NOT replace permanent type
with disposable. The dimensional size of the replacement fil-
ter must be the same as the replaced filter.
MOTORS
Outdoor fan motors are permanently lubricated and require
no maintenance.
Ventor motor is factory lubricated for an estimated 10 year
life.
Indoor Blower Motor and Drive - The indoor blower motor fea-
tures ball bearings that do not require periodic lubrication.
Periodic lubrication of the motor and bearings can extend the
life of components but is optional.
On an annual basis, check the motor for accumulations of
dust, etc. that may block the cooling slots in the motor shell.
Check for loose, damaged or misaligned drive components.
Check that all mounting bolts are tight. Replace defective
parts as required.
If desired, every three years remove both pipe plugs at each
end shell and clean out any hardened grease or foreign mat-
ter. Replace one plug on each end with a clean grease fitting.
Using a low pressure grease gun, pump grease (Chevron
SRI-2 or equivalent) into the bearing cavity until new grease
shows at the open port. Do not over lubricate. Run the motor
for ten minutes until excess grease is purged from the cavity.
Replace the plugs.
On 20 ton only, units are supplied with blower shaft bearings
that do not require maintenance but may be relubricated if
desired. Every three years, using a low pressure grease gun,
pump grease into the bearing grease fitting until grease just
begins to show at the seals. Do not over lubricate. Use any
lithium base grease recommended for ball bearing service.
OUTDOOR COIL
Dirt should not be allowed to accumulate on the outdoor coil
surface or other parts in the air circuit. Cleaning should be as
often as necessary to keep coil clean. Use a brush, vacuum
cleaner attachment, or other suitable means. If water is used
to clean coil, be sure electric power to the unit is shut off prior
to cleaning.
NOTE:
Exercise care when cleaning the coil so that the coil
fins are not damaged.
NOTE:
Do not permit the hot condenser air discharge to be
obstructed by overhanging structures of shrubs.
BURNER & PILOT
Periodically (at least annually at the beginning of each heat-
ing season) make a visual check of the pilot and main burner
flame. If necessary, adjust main burner primary air shutters to
give a distinct, sharp blue flame as explained under BURNER
AIR SHUTTER ADJUSTMENT. If it is not possible to adjust
for the proper flame, the burners may need cleaning.
TO CLEAN BURNERS
Remove them from the furnace as explained in Burner
Instructions. Clean burners with hot water applied along top
of the burner.
COMBUSTION AIR DISCHARGE
Visually inspect discharge outlet periodically to make sure
that the buildup of soot and dirt is not excessive. If necessary,
clean to maintain adequate combustion air discharge.
CLEANING FLUE PASSAGES AND HEATING ELE-
MENTS
With proper combustion adjustment the heating element of a
gas fired furnace will seldom need cleaning. If the element
should become sooted, it can be cleaned as follows:
Prior to any of the following maintenance proce-
dures, shut off all electric power to the unit to pre-
vent personal injury.
Damage can occur if the bearings are overlubri-
cated. Use grease sparingly.
Perform all maintenance operations on the blower
motor with electric power disconnected from the
unit. Do not attempt to lubricate bearings with the
unit in operation.