Engineering manual - SAB 193-233-283 S A-frame (including ATEX)
008831 en 2020.10
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Faultfinding instructions
Compressor unit - oil separation
Symptom
Probable cause Solution
Gradual oil loss with
an oil level in the co-
alescer section sight
glass
Maintaining too high oil level.
Lower level by opening/adjusting
the oil return valve.
Refrigerant carry-over or liquid in-
jection overfeeding.
Correct operation.
Loss of suction superheat. Adjust evaporator feeds.
Contaminated oil, damaged or not
seated coalescer elements.
Replace oil charge and coalescers.
Coalescer return valve closed.
Open return valve.
Coalescing oil return line strainer
blocked.
Clean strainer.
Rapid loss with no oil
level in the coalescer
section sight glass
On shutdown, compressor unit suc-
tion check valve did not close.
Repair valve.
Suction check valve bypass open too
far.
Close valve.
Coalescers loose or not seated
properly.
Correct or replace.
On economised unit: economiser
check valve not working.
Repair or replace.
Shaft seal leakage
Leakage exceeds normal allowable
rate of 7 drops per minute.
Replace seal.
Table 55: Compressor unit - oil separation
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