NORMAL MAINTENANCE
CAUTION: Prior to any of the following maintenance proce-
dures, shut off all electric power to the unit to
prevent personal injury.
FILTERS - Inspect once a month. Replace disposable or clean
permanent type as necessary. DO NOT replace permanent
type with disposable. The dimensional size of the replacement
filter must be the same as the replaced filter.
MOTORS
Outdoor fan motors are permanently lubricated and require no
maintenance.
Indoor Blower Motor and Drive - The indoor blower motor
features ball bearings that do not require periodic lubrication.
Periodic lubrication of the motor and bearings can extend the
life of components but is optional.
CAUTION: Damage can occur if the bearings are overlubri-
cated. Use grease sparingly.
WARNING: 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.
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 matter.
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.
Do not permit the hot outdoor air discharge to be
obstructed by overhanging structures of shrubs.
SECURE OWNER’S APPROVAL
: When the system is functioning properly, secure the owner’s approval. Show him the
location of all disconnect switches and the thermostat. Teach him how to start and stop the unit and how to adjust temperature
settings within the limitations of the system.
MAINTENANCE
FIG. 12 - AMBIENT MODIFIED TIME/TEMPERATURE CONTROL
T1 - 50 MINUTE SETTING
T2 - 80 MINUTE SETTING
T3 - 110 MINUTE SETTING
(Factory Set Point)
SHORTING PEGS TO
OVERRIDE TIMER
FOR SERVICE
MOVABLE JUMPER
WIRE TO CHANGE
DEFROST TIMER
511.06-N3Y
18
Unitary Products Group
