ActronAir Liquid Access Valve provides a refrigerant liquid line access point for charging, pressure testing, and service procedures on WRC series wall split systems on compatible ActronAir R22/R410A split ducted and wall split systems. The liquid access valve must be fully open during normal system operation -- a partially closed valve starves the expansion device and reduces capacity. Isolate power and recover all refrigerant before replacing any refrigerant circuit valve components.