This pilot operated solenoid valve is the industry standard for boiler systems

System Protection: Acts as a safety limit to prevent the defrost heater from running continuously

Constructed from corrosion-resistant galvanized steel with a black protective finish

turn the range adjusting screw clockwise

Johnson Controls M9220-AGA-3 Actuator 320074-702 This pilot operated solenoid valveThe Johnson Controls M9220 AGA 3 is a heavy duty spring return direct coupled actuator designed for floating control applications in demanding HVACR systems. Delivering a robust 177 lb in torque, this 24Vac Vdc actuator is engineered for precise positioning of large dampers and valves, ensuring reliable fail safe operation during power loss. With a 150 second power on run time, it provides smooth, consistent modulation without hunting. This model