R-Pro › Field cases › Refrigeration systems
Debris Blockage (Sludge or Welding Residue)
Likely causes
Flux or oxide residue from pipe brazing
Check: Remove and clean TXV inlet screen
What to do: Remove and clean TXV inlet screen → For capillary: replace drier and backflush with nitrogen → Recover all refrigerant and replace filter drier → Nitrogen flush the circuit → Evacuate, recharge, and confirm pressures and superheat are normal
Sludge from oil degradation
Check: For capillary: replace drier and backflush with nitrogen
What to do: For capillary: replace drier and backflush with nitrogen → Recover all refrigerant and replace filter drier → Nitrogen flush the circuit → Evacuate, recharge, and confirm pressures and superheat are normal
Copper or iron particles in circuit
Check: Recover all refrigerant and replace filter drier
What to do: Recover all refrigerant and replace filter drier → Nitrogen flush the circuit → Evacuate, recharge, and confirm pressures and superheat are normal
Debris is blocking the expansion valve or capillary tube. Clean the screen and replace the filter drier. Recurrence is likely if the source of debris (poor brazing, oil degradation) is not addressed.
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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