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Parallel Compressor Systems Installation & Operations Manual, October 2004 33
Parallel Compressor Systems
General Maintenance Schedule
(Service/Maintenance should be performed only by a qualied
/ certied refrigeration service technician.)
Weekly
Check refrigerant charge using the liquid line sight glass
Check compressor oil level
Check compressor crankcase heater operation
Check main power and control voltage
Check appearance of area around the unit
Check system pressures
Monthly
Check the refrigerant system for leaks
Check suction lters and liquid line lter driers.
Check all anged connection bolts, ttings and line clamps
for tightness.
Inspect condenser fan blades and motor mounts for cracks,
loose set screws or mounting bolts.
Tighten all electrical connections.
Check operation and condition of contacts on compressor/
fan motor contactors. Check appearance of control panel
interior.
Check appearance of exterior conduit/junction boxes.
Check appearance of insulation.
Check operation of auxiliary equipment.
Quarterly
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With unit in stable operation, record all operating conditions:
Suction/discharge/liquid refrigerant pressure(s) and
temperature(s).
System superheat, liquid subcooling, ambient
temperature.
Compressor amperage.
Test all operating and safety controls.
Annually
Obtain oil sample for analysis. Change oil if required.
Clean condenser coil.
Straighten condenser ns as required.
Change liquid line lter drier and suction lter cores.
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Note: The above information is provided only
as a general guideline to aid servicing
personnel and equipment owners in
maintaining equipment. Due to variables
in the actual equipment application,
operating conditions, and environment
recommended service intervals may vary.