Troubleshooting
Noisy compressor. Start-up: Brief period of mechanical
noise may be noticed on start up due to
initial contacting of the spirals. This will
quickly disappear.
No detrimental effect - no action necessary.
Shut down: Compressor reverses
momentarily as internal pressure
equalises.
No detrimental effect - no action necessary.
Check refrigeration charge. If low, locate and repair leak and charge to
correct design conditions adding Ester oil if
necessary.
Lack of oil. Repair leaks if any, add oil if required but not
too much - remember too much is as bad as
too little.
Expansion valve stuck in open position
(abnormally cold suction line).
Ensure temperature bulb is tight on suction.
Replace power assembly or valve if
necessary.
Broken or scored compressor bearings. Replace compressor.
Compressor (3 phase) rotation incorrect Check electrical supply for correct phase
rotation (R Y B)
Low superheat allowing liquid into
compressor.
Check superheat.
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