York YS Service Manual download pdf (Page 54)

Oil System Faults Detected During Regular Inspections

Fault Possible Cause Recommended Action

OIL RESERVOIR LEVEL DROPPING

WHILE UNIT SITTING IDLE

System cycling without compressor

run being achieved

Check correct control system and

start-up operation

Main oil supply line solenoid valve

by-passing

Repair or replace valve

Internal separator reservoir leak Repair or replace oil separator

OIL RESERVOIR LEVEL DROPPING

SLOWLY WHILE UNIT RUNNING

LIGHTLY LOADED

System cycling without compressor

running long enough to return oil

Do not run unit at very low loads

Discharge pressure too low Check cooling tower / cooling water

system arrangement and operation

Check refrigerant charge

Second stage separation fault Repair or replace oil separator

OIL RESERVOIR LEVEL DROPPING

QUICKLY WHILE UNIT RUNNING

LIGHTLY LOADED

Unit running too lightly loaded Restrict minimum SV position to 5%

Upper evaporator eductor system not

returning oil

Change oil line strainer

Check eductor operation

OIL RESERVOIR LEVEL DROPPING

SLOWLY WHILE UNIT RUNNING

LOADED

Lower evaporator eductor system not

returning oil

Change oil line strainer

Check eductor operation

OIL RESERVOIR LEVEL DROPPING

QUICKLY WHILE UNIT RUNNING

LOADED

Oil separator capacity exceeded If at pulldown: limit unit capacity using

pulldown demand limit

If at steady load with high chilled

leaving temp: limit unit capacity to

design using current limit

Incorrect oil type Check oil

Second stage separation fault Repair or replace oil separator

OIL RESERVOIR LEVEL DROPPING

WHILE LEVEL INCREASING IN

SECOND STAGE SIGHT GLASS

Second stage oil return line blocked Check valves are open

Change oil line strainer

Check orifice

OIL RESERVOIR LEVEL DROPPING

WHILE CONTROL CENTRE GIVING

EXCESS CHARGE WARNING

Excess refrigerant Trim refrigerant charge

Excess oil in refrigerant Clean up charge

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York YS Service Manual Page 54

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