Vogt TUBE-ICE 03TB Service Manual page 79

03TA Service Manual
SYMPTOM: Low compressor oil level.
POSSIBLE CAUSE
Oil separator not returning oil.
Repeated short cycling (refrigerant carrying oil
out of compressor).
Worn piston rings.
2/14/07
POSSIBLE REMEDY
Check oil separator float and oil return stop
valve (70) and line for a restriction. The oil
return line should
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.
Usually caused by freeze-up, low refrigerant
charge, low head pressure, faulty timer, faulty
pressure switch or expansion valve clogged.
Use process of elimination.
This condition is hard to detect without
dismantling the compressor and checking
piston ring tolerances. Normally there will be
a little puddle of oil lying on top of the piston
when the head and valve plate are removed. It
is best to replace the compressor.
TROUBLESHOOTING
be above ambient
8-7