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FAN MOTOR SURGE PROTECTION
Surge Protector (Metal Oxide Varistor − MOV) − A part
designed to protect electrical devices from voltage spikes
that are 3 to 4 times the normal circuit voltage (See Figure
26 for illustration of component).
An MOV works as follows: It is essentially a batch of
metallic−oxide grains separated by insulating layers.
Repeated voltage surges break down the insulating layers,
lowering the overall resistance and eventually causing the
device to draw too much current and trip whatever
over−current protection is inherent in the system)
MOV Check: They are supposed to be located beyond the
line fuse (though possibly not always). In this case, where
the line fuse blows or circuit breaker trips but there is no
visible damage to the MOV(s), the simplest test may be to
just temporarily remove the MOV(s) and see if the problem
goes away.
See Figure 1 for location of the Surge Protections device
which is located in the unit control box area.
Figure 26. Fan Motor Surge Protection Device
Maintenance and service must be performed by a qualified
installer or service agency. At the beginning of each
cooling season, the system should be checked as follows:
1. Outdoor unit fan motor is pre−lubricated and sealed.
No further lubrication is needed.
2. Visually inspect all connecting lines, joints and coils for
evidence of oil leaks.
3. Check all wiring for loose connections.
4. Check for correct voltage at unit (unit operating).
5. Check amperage draw on outdoor fan motor.
Motor Nameplate:_________ Actual:__________.
6. Inspect drain holes in coil compartment base and
clean if necessary.
NOTE - If insufficient cooling occurs, the unit should be
gauged and refrigerant charge should be checked.
Clean and inspect outdoor coil (may be flushed with a
water hose). Ensure power is off before cleaning.
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NOTE
It may be necessary to flush the outdoor coil
more frequently if it is exposed to substances which are
corrosive or which block airflow across the coil (e.g., pet
urine, cottonwood seeds, fertilizers, fluids that may contain
high levels of corrosive chemicals such as salts)
Sea Coast
Moist air in ocean locations can carry salt,
which is corrosive to most metal. Units that are located
near the ocean require frequent inspections and
maintenance. These inspections will determine the
necessary need to wash the unit including the outdoor coil.
Consult
your
installing
intervals/procedures for your geographic area or service
contract.
1. Clean or change filters.
2. Lennox
blower
permanently sealed. No more lubrication is needed.
3. Adjust blower speed for cooling. Measure the pressure
drop over the coil to determine the correct blower CFM.
Refer to the unit information service manual for pressure
drop tables and procedure.
4. Belt Drive Blowers − Check belt for wear and proper
tension.
5. Check all wiring for loose connections.
6. Check for correct voltage at unit. (blower operating)
7. Check amperage draw on blower motor.
Motor Nameplate:_________ Actual:__________.
1. Clean coil if necessary.
2. Check connecting lines, joints and coil for evidence of
oil leaks.
3. Check condensate line and clean if necessary.
HOMEOWNER
Cleaning of the outdoor unit's coil should be performed by
a trained service technician. Contact your dealer and set
up a schedule (preferably twice a year, but at least once a
year) to inspect and service your outdoor unit. The
following maintenance may be performed by the
homeowner.
Physical contact with metal edges and corners while
applying excessive force or rapid motion can result in
personal injury. Be aware of, and use caution when
working near these areas during installation or while
servicing this equipment.
IMPORTANT
Sprinklers and soaker hoses should not be installed
where they could cause prolonged exposure to the
outdoor unit by treated water. Prolonged exposure of the
unit to treated water (i.e., sprinkler systems, soakers,
waste water, etc.) will corrode the surface of steel and
aluminum parts and diminish performance and longevity
of the unit.
Page 47
contractor
for
Indoor Unit
motors
are
prelubricated
Indoor Coil
CAUTION
proper
and
XC17 SERIES
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