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Oil Pressure Trip / Low Oil Level

Likely causes

Oil lost along with refrigerant during leak

Check: Check oil level via sight glass — below minimum mark indicates oil loss. Inspect entire system with refrigerant leak detector to locate leak

What to do: Repair refrigerant leak → evacuate → recharge refrigerant → top up oil to specified level (must use manufacturer-specified oil; incompatible oil prohibited)

Faulty oil separator — oil circulating through the system

Check: Check oil separator outlet pipe temperature — overheating indicates excess oil mixed with refrigerant. Observe gradual oil level decrease and oil traces on refrigerant piping

What to do: Inspect and replace oil separator. Recommend replacing core filter simultaneously. Consider oil flushing of refrigerant circuit

Refrigerant flooding — liquid refrigerant migrates into crankcase during standstill

Check: Check for oil foaming and abnormal noise immediately after startup — refrigerant contamination causes white foamy oil. Verify crankcase heater operation (heater burnout means no operation below 12°C)

What to do: Replace crankcase heater (mandatory in environments below 12°C). Establish 2+ hour pre-start heater operation procedure. Replace oil

Clogged oil filter

Check: Measure oil filter differential pressure — schedule replacement at ΔP 0.10 MPa, replace immediately if >0.15 MPa. Check cumulative operating hours (2,000-hour benchmark)

What to do: Replace oil when replacing filter → after replacement, remove air via purge valve → confirm oil level (midpoint of sight glass). Separately inspect bearing wear if excessive metal particles found

Field tip

Crankcase heater must operate below 12°C ambient. When topping up after oil loss, always use manufacturer-specified oil type — mixing prohibited.

All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.

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