For return-side

Why is my York furnace displaying a pressure switch error

which typically requires a normally closed switch that opens on rise

Operating on a normally closed circuit

Copeland Comfort Control (Alco) 049609 Solenoid Valve Els PW 17895 For return-sideThe Copeland Comfort Control (Alco) 049609 Solenoid Valve, also identified by model 200RB3T3, is a heavy duty, 2 way normally closed solenoid valve engineered for precision flow control in commercial refrigeration and HVAC systems. This pilot operated valve is designed for high side or low side applications, including liquid, suction, and discharge gas service. With its 3 8" ODF (Sweat) connections featuring extended ends, it allows for easy brazing