The Johnson Controls P32AF-2 is a high-sensitivity differential pressure switch designed for precision air flow proving and pilot duty applications. This SPDT (Single Pole Double Throw) control features an adjustable setpoint range of 0.05" Wc to 5" Wc, making it an essential component for monitoring clogged filters, proving fan operation, and detecting icing on cooling coils. Built with a durable Buna-N diaphragm and a NEMA 1 enclosure, the P32AF-2 provides reliable switching for 120/240 Vac circuits with a 1/4 horsepower rating. This model includes an integrated scale plate for simplified field calibration and is supplied with a robust U-bracket for secure mounting. The P32AF-2 is technically identical to the P32AF-2C, ensuring seamless integration into existing Building Automation Systems (BAS) and HVACR air-side control loops. Its close differential profile allows it to react to minute changes in static or velocity pressure, ensuring optimal system safety and performance in HVAC air flow proving applications. Key Benefits Precise Pressure Monitoring: Features a sensitive differential pressure range from 0.05 to 5.0 inches Water Column, ideal for low-pressure sensing. Simplified Calibration: The visible adjustable scale plate allows for fast and accurate setpoint adjustments in the field without specialized tools. Durable Construction: Equipped with a Buna-N diaphragm and a zinc-plated steel housing for long-term stability in various environmental conditions. Flexible Mounting: Includes a standard U bracket to support diverse installation requirements in mechanical rooms and air handling units. Versatile Application: Rated for 120/240 Vac operation, making it compatible with a wide array of commercial and industrial HVACR equipment. Common Questions What is the difference between the P32AF-2 and the P32AF-2C? Physically and operationally, the P32AF-2 and P32AF-2C are identical units. The "C" suffix is often used by the manufacturer to denote retail-ready or specific packaging, but the technical specifications and electrical ratings remain the same. Can this switch be used for vacuum sensing? Yes, the Johnson Controls P32AF-2 can detect vacuum by connecting the vacuum source to the low-pressure port while leaving the high-pressure port open to atmospheric pressure. Does the mounting orientation affect the setpoint? The unit is factory-calibrated with the Buna-N diaphragm in a vertical plane. Installing the switch in a horizontal position can shift the setpoint by approximately 0.07" Wc, so field recalibration using the adjustable scale plate is recommended if not mounted vertically. 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.
