Johnson Controls P32AC-8 Pressure Control

The Johnson Controls P32AC-8 is a high-precision differential pressure control designed for sensing air flow and pressure differentials in commercial HVACR systems. Built with a Buna-N diaphragm and a NEMA Type 1 enclosure, this SPDT pressure switch is engineered for critical applications like air flow proving with electric duct heaters, clogged filter detection, and de-icing cycles. This specific model features an adjustable set point range of 0.5" Wc to 5" Wc, providing the sensitivity required for variable air volume (VAV) systems and reheat duct powered configurations. The P32AC-8 (functionally identical to the P32AC-8C) utilizes 1/8" NPT female connectors and can be adapted for vacuum sensing or positive gauge pressure monitoring. Integrated with a dust-tight snap-acting switch, it maintains reliable setpoint repeatability and performance in ambient temperatures ranging from -40?F to 165?F. Installers should note that the factory calibration is set in a vertical plane; mounting in alternative orientations may require field adjustment using the internal scale plate to ensure accuracy within the 12" Wc maximum operating pressure limit.

• Broad Compatibility: Replaces and functions identically to the P32AC-8C, ensuring seamless integration into existing Johnson Controls setups.
• Precision Monitoring: Highly sensitive differential pressure switch capable of detecting subtle flow changes to protect electric strip heaters and coils.
• Industrial Durability: Rated for 120-277 VAC pilot duty with a robust Buna-N diaphragm for long-term operational stability.
• Versatile Application: Supports air flow proving, air conditioning coil frosting detection, and clogged filter detection in high-demand environments.
• Flexible Installation: Features 1/8" NPT high and low pressure ports for easy connection to metal or plastic tubing.

How do I adjust the setpoint on the P32AC-8?
Remove the NEMA Type 1 cover to access the internal adjusting screw. Turn the screw clockwise to increase the setpoint or counter-clockwise to decrease it, using the built-in scale for reference. Always calibrate in the final mounting position.

Can this switch be used for vacuum sensing?
Yes. By connecting the vacuum source to the low-pressure port and leaving the high-pressure port open to ambient air, the P32AC-8 functions effectively as a vacuum detector.

What is the difference between the P32AC-8 and P32AC-8C?
These models are technically identical in performance, construction, and specifications; the "C" suffix typically denotes a commercial packaging or updated revision code that does not impact technical compatibility.

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.