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Receiver Tank Overcharge

Likely causes

Refrigerant charged beyond specified amount — charge log not verified, scale not used

Check: Check receiver liquid level sight glass — level above 70% indicates overcharge. Also check condensing pressure and subcooling

What to do: Recover refrigerant 100 g at a time → wait 5 min → recheck receiver level and subcooling → stop when 50–70% reached

Seasonal temperature drop lowers condensing temperature → excess liquid accumulation on high side

Check: Check condensing saturation temperature vs. ambient — if condensing superheat <5°C, suspect overcharge

What to do: Recover refrigerant 100 g at a time → verify subcooling is 5–8°C → adjust to receiver level 50–70%

Condenser fan over-running at low ambient → excessive subcooling mistaken for low charge → unnecessary extra charge

Check: Measure subcooling: if >10°C while normal is 5–8°C, check fan inverter settings for over-running

What to do: Adjust fan inverter settings (reduce fan speed at low ambient) → verify subcooling 5–8°C and recover refrigerant if still excess

Field tip

Optimal receiver level: 50–70%. Above 80%, rising temperature or load changes may trigger the relief valve. Always use a scale when charging.

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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