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Subcooling Calculator
Calculate liquid line subcooling to verify your condenser refrigerant charge. Enter the condenser saturation temperature and liquid line temperature for an instant subcooling reading.
What is Subcooling?
Subcooling is the temperature difference between the saturated liquid refrigerant at condenser pressure and the actual liquid line temperature leaving the condenser. It ensures a solid column of liquid at the expansion device, preventing flash gas.
Target subcooling is typically 5–12°C for TXV systems. Correct subcooling ensures the expansion device receives fully liquid refrigerant for proper metering and evaporator performance.
Frequently Asked Questions
What should subcooling be?
Target subcooling is typically 5–12°C for TXV systems. Always check the manufacturer's specification for the exact target, as it varies by unit and refrigerant.
What causes low subcooling?
Low subcooling indicates an undercharge or a restriction before the expansion device. The system doesn't have enough refrigerant to fully condense and subcool the liquid.
What causes high subcooling?
High subcooling indicates an overcharge or a restriction in the liquid line. Too much refrigerant backs up in the condenser, increasing subcooling.
Subcooling Calculator
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