R-Pro › Field cases › Refrigeration systems
Low Oil Pressure from Overly Open Pressure Regulating Valve
Likely causes
Oil pressure regulating valve set point drifted
Check: Confirm normal oil pressure range (typically suction pressure + 1.5–3 bar)
What to do: Confirm normal oil pressure range (typically suction pressure + 1.5–3 bar) → Slowly tighten oil pressure regulating valve clockwise to raise pressure → Once target pressure reached, tighten lock nut → If pressure remains unstable after adjustment, consider replacing valve spring
Valve spring aged or broken
Check: Slowly tighten oil pressure regulating valve clockwise to raise pressure
What to do: Slowly tighten oil pressure regulating valve clockwise to raise pressure → Once target pressure reached, tighten lock nut → If pressure remains unstable after adjustment, consider replacing valve spring
The oil pressure regulating valve is too open, causing bypass. Re-adjust the valve. Setting oil pressure too high can damage oil seals. Always refer to manufacturer specifications.
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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