Liquid Line Solenoid Valve

Liquid Line Solenoid Valve

A liquid line solenoid valve is recommended on all field installed systems with large refrigerant charges, particularly when the system has a charge in excess of three pounds of refrigerant per motor HP. The solenoid valve will prevent continued feed to the evaporator through the expansion  valve or capillary tube when the compressor is not operating, and will control migration of liquid refrigerant from the receiver and condenser to the evaporator and compressor crankcase.

If a pumpdown cycles is not used, the liquid line solenoid valve should be wired to the compressor motor terminals so that the valve will be de-energized when the motor is not operating.