Johnson Controls P32AC-2 Pressure Switch

The Johnson Controls P32AC-2 Pressure Switch is a heavy-duty adjustable differential pressure switch engineered for precision monitoring of low-pressure air and non-combustible gases. Designed for HVAC air pressure monitoring, burner control, and clogged filter detection, this unit features a highly sensitive Buna-N diaphragm that ensures accurate response to pressure changes as low as 0.05" WC. The SPDT contact configuration (Single Pole Double Throw) provides versatile switching capabilities, rated for 1/2 horsepower at 120/240 VAC, making it ideal for direct control of fans, blowers, and industrial pilot circuits.

Housed in a NEMA 1 zinc-plated steel enclosure, the P32AC-2 is built for professional mechanical room environments. It offers a wide adjustable setpoint range of 0.05" to 5.0" WC, visible via an internal scale plate for field calibration. The automatic reset functionality and progressive differential?ranging from 0.025" to 0.6" WC?provide the stability required for differential pressure sensing in complex ductwork. This kit is a complete field solution, supplied with 1/4" compression fittings, a 4" extension tube, mounting hardware, and an angle barb fitting for immediate installation into low pressure air systems.

Key Benefits for Contractors

• Field Adjustable Range: High-precision setpoint control between 0.05 and 5.0 inches of water column for diverse HVAC pressure switch applications.
• Industrial Build Quality: Rugged metallic housing and polycarbonate components outperform standard plastic switches in demanding commercial settings.
• Multi-Voltage Compatibility: High electrical rating supports 120V to 277V AC circuits, providing flexibility for air proving switch integration.
• Comprehensive Installation Kit: Includes U-bracket, mounting screws, "O" gasket, and extension tubing to reduce time on the job site.
• Environmental Resilience: Rated for operation from -40?F to 165?F, ensuring reliable pressure control in unconditioned mechanical spaces.

Common Questions

What is the maximum pressure this switch can handle?
The P32AC-2 has a maximum proof pressure of 12" WC and a burst pressure of 27.7" WC. It is critical to stay within these limits to prevent diaphragm damage.

Can this be used for liquid flow sensing?
No, this model is specifically engineered for use with inert dry air and non-corrosive gases. For liquid pressure control, a dedicated water pressure switch should be utilized.

How should the switch be mounted for maximum accuracy?
For optimal calibration and repeatability, the switch should be mounted vertically. Mounting in other orientations may shift the setpoint due to the weight of the internal diaphragm.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.