Johnson Controls P32AF-1 Pressure Switch

The Johnson Controls P32AF-1 is a high-precision differential air pressure switch designed for critical air proving and flow detection in commercial HVACR systems. As a sensitive pressure switch with a close differential, it is engineered to sense subtle changes in differential pressure, velocity pressure, or pressure drop across fixed restrictions. This SPDT pressure switch (Single-Pole Double-Throw) features an adjustable set point ranging from 0.05" Wc to 5" Wc, allowing for fine-tuned field calibration via the integrated scale plate. Housed in a durable NEMA 1 enclosure, the P32AF-1 utilizes a Buna-N diaphragm to actuate a snap-acting switch, ensuring reliable performance in air proving for electric duct heaters, clogged filter detection, and defrost cycle initiation. The P32AF-1 is functionally identical to the P32AF-1C, providing a direct replacement for contractors maintaining complex building automation systems.

• Versatile Application Range: Ideal for air proving with electric heaters, clogged filter detection, and icing detection on AC coils.
• Precision Control: Features a close differential (0.018" to 0.12" WC) for high-sensitivity requirements in VAV systems and reheat ducts.
• Rugged Field Integration: Equipped with an L-bracket for flexible mounting and 1/8" NPT internal connections for standard pneumatic tubing.
• Electrical Compatibility: Rated for 1/4 HP at 120/240 VAC, supporting inductive and resistive loads up to 15A.

Is the P32AF-1 a direct replacement for the P32AF-1C?
Yes, the P32AF-1 and P32AF-1C are technically identical parts. The "C" suffix in Johnson Controls nomenclature typically indicates a retail or contractor-pack designation but shares the same internal specifications and performance curves.

Can this switch be used to detect vacuum or positive gauge pressure?
Absolutely. While primarily used for differential pressure, you can detect positive gauge pressure by using the high-pressure port only, or sense a vacuum by connecting only the low-pressure port and leaving the other open to ambient pressure.

Does the mounting orientation affect the set point?
The P32AF-1 is factory-calibrated with the diaphragm in a vertical plane. If mounted in a different orientation, the set point may shift (typically by 0.07" W.C. if the housing is down), requiring field recalibration using the adjustable scale plate.

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.