R-Pro › Field cases › Refrigeration systems
Non-Condensable Gas (Air) in Circuit
Likely causes
Refrigerant charged without sufficient vacuum
Check: Stop unit and compare measured vs saturation pressure (excess = non-condensable gas)
What to do: Stop unit and compare measured vs saturation pressure (excess = non-condensable gas) → Recover all refrigerant → Evacuate 30+ minutes to ≤500 μm Hg → Purge charging hoses, then recharge by weight → Confirm high-side pressure normalizes
Air ingress during leak repair
Check: Recover all refrigerant
What to do: Recover all refrigerant → Evacuate 30+ minutes to ≤500 μm Hg → Purge charging hoses, then recharge by weight → Confirm high-side pressure normalizes
Air in charging hoses not purged
Check: Evacuate 30+ minutes to ≤500 μm Hg
What to do: Evacuate 30+ minutes to ≤500 μm Hg → Purge charging hoses, then recharge by weight → Confirm high-side pressure normalizes
Non-condensable gas contaminating the circuit is causing abnormally high pressure. Fully recover refrigerant, re-evacuate, and recharge. Send contaminated refrigerant to a reclamation facility.
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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