R-Pro › Field cases › Components
Missing Oil Trap on Vertical Riser — Oil Accumulation
Likely causes
No oil trap at vertical riser base — oil cannot rise at low velocity
Check: Check compressor oil level drop + foaming in sight glass; measure suction line velocity (below 4 m/s oil cannot rise); inspect vertical section pipe configuration
What to do: Install U-shape oil trap at vertical riser base — same pipe diameter, 300 mm depth; add intermediate trap for every 3 m of rise; top up oil and resume operation
Insufficient refrigerant velocity (below 4 m/s) — partial-load operation
Check: Verify suction line velocity 4–8 m/s at full load; minimum 3.5 m/s at low load; check for oversized piping
What to do: If oversized, reduce pipe one size to restore velocity; add oil separator to improve oil return rate
One oil trap per 3 m of vertical riser; trap depth equals pipe diameter (minimum 150 mm)
All 565 cases work offline in R-Pro, with error codes for 62 brands and P-T data for 108 refrigerants.
Open R-Pro →Related cases
- Liquid Refrigerant Entering Compressor (Flooded Start / Liquid Slugging)
- Compressor Motor Burnout / Ground Fault
- High Compressor Discharge Temperature (>107°C scroll, >120°C recip)
- Scroll Compressor Reverse Rotation — 3-Phase Miswiring
- Scroll Tip Seal Wear — Volumetric Efficiency Loss and Reduced Cooling Capacity
- Scroll Poppet Valve Fails to Close — Reverse Rotation Noise After Shutdown