Heatcraft Refrigeration Products 25000102 Benutzerhandbuch

Parallel Compressor Systems Installation & Operations Manual, October 2004  

33

(Service/Maintenance should be performed only by a qualified 

/ certified refrigeration service technician.)

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

Check the refrigerant system for leaks
Check suction filters and liquid line filter driers.
Check all flanged connection bolts, fittings 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.

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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.

Obtain oil sample for analysis. Change oil if required.
Clean condenser coil.
Straighten condenser fins as required.
Change liquid line filter drier and suction filter cores.

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