Vogt P118F/HE100, Service Manual

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05TA Service Manual
TROUBLESHOOTING
7/19/13
8-7
SYMPTOM: Low compressor oil level.
POSSIBLE CAUSE POSSIBLE REMEDY
Oil separator not returning oil. Check oil separator float and oil return stop
valve (70) and line for a restriction. The oil
return
line should be above ambient
temperature most of the time as it returns oil.
It may be cooler at the start of a freeze cycle.
Repair or replace defective parts.
Repeated short cycling (refrigerant carrying oil
out of compressor). Usually caused by freeze-up, low refrigerant
charge, low head pressure, faulty timer, faulty
pressure switch or expansion valve clogged.
Use process of elimination.
Worn piston rings. This condition is hard to detect without
dismantling the compressor and checking
piston ring tolerances. Normally there will be a
little puddle of oil laying on top of the piston
when the head and valve plate are removed. It
is best to replace the compressor.