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
Outdoor Unit
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.
Outdoor Coil
Clean and inspect outdoor coil (may be flushed with a water hose). Ensure power is off before cleaning.
NOTE door 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
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 contractor for proper intervals/procedures for your geographic area or service contract.
Indoor Unit
1.Clean or change filters.
2.Lennox blower motors are prelubricated and 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:__________.
Indoor Coil
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.
CAUTION
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.
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XC17 SERIES
