Where is the high-side hose connected when measuring subcooling with digital gauges?

The measurement of subcooling is performed to determine the efficiency of the refrigerant cycle, specifically after the refrigerant has condensed and prior to expansion. The correct connection point for measuring subcooling with digital gauges is the liquid line service port.

By connecting the high-side hose to the liquid line service port, which is located after the condenser, you can accurately measure the pressure in the liquid line. This pressure reading is essential for calculating the subcooling, as subcooling is the difference between the actual temperature of the refrigerant in the liquid line and its saturation temperature at the corresponding pressure. The higher the subcooling value, the more liquid refrigerant is present in the system, indicating efficient operation.

This focus on the liquid line service port allows for a more accurate assessment of how effectively the condenser is performing in cooling the refrigerant, ensuring that it transitions to a liquid state before entering the expansion device. This measurement is critical in HVAC/R systems for optimizing performance and efficiency.