What does a liquid line do?

A liquid line in a refrigeration or air conditioning system transports refrigerant in its liquid state from the condenser to the expansion device, such as a metering valve or capillary tube. This line is crucial for maintaining the efficiency of the system, as it ensures that the refrigerant is in the appropriate state to absorb heat during the evaporation process in the evaporator coil. Proper insulation and sizing of the liquid line are essential to minimize energy loss and prevent refrigerant vaporization before reaching the expansion device.