Johnson Controls W351AB-2 Humidity Control 321894-709 but it can also be

but it can also be used in combination with Type C valves or as part of a multi-pilot arrangement involving temperature or solenoid pilots

when paired with the correct D-9502 positioner

Technicians should check for a "Pressure Switch Open" fault code on the furnace control board

Is this switch compatible with 80% and 90%+ AFUE furnaces

Johnson Controls W351AB-2 Humidity Control 321894-709 but it can also beThe Johnson Controls W351AB 2 Humidity Control is a professional grade electronic humidity control designed for precise relative humidity management in demanding environments like computer rooms, pharmaceutical manufacturing, and clean rooms. This System 350 electronic control operates bridging a 10% to 90% RH setpoint range with a field adjustable 2% to 10% RH differential. Engineered for flexibility, it features a SPDT relay output and a built in 12