The Johnson Controls P32AF-13 is a precision-engineered differential pressure switch designed for demanding air proving and flow monitoring applications in commercial HVACR systems. Built with a durable Buna-N diaphragm, this control provides reliable sensing of pressure changes across filters, coils, and heat exchangers within a range of 0.03 to 1.4 inches WC. As a veteran-grade SPDT pressure switch, it features an internal scale for field-adjustable setpoints, ensuring versatile integration into variable air volume (VAV) systems and electric duct heater circuits. The P32AF-13 is optimized for low-pressure environments, offering a close differential to maintain tight operational tolerances. Whether used for clogged filter detection or icing prevention on AC coils, this NEMA 1 rated unit ensures the mechanical integrity of the air handling process. Its compact design and multiple mounting configurations make it a standard choice for technicians requiring a versatile HVAC air pressure sensor that performs consistently between -40?F and 165?F. Key Benefits for the Contractor: Precise Pressure Monitoring: Features an adjustable range of 0.03" to 1.4" WC with a sensitive switching differential for high-accuracy air flow proving. Rugged Diaphragm Construction: The Buna-N diaphragm is compatible with both air and non-combustible gases, ensuring long-term stability in diverse environments. Flexible Electrical Integration: Equipped with an SPDT relay (1/4 HP at 120/240 VAC) for seamless normally open or normally closed wiring requirements. Field Calibration Ease: Includes an easy-to-read setpoint scale under the cover, allowing for quick adjustments without specialized bench tools. Versatile Mounting: Supports direct duct mounting or remote sensing via 1/8" NPT or barbed fittings, adapting to complex mechanical room layouts. Common Technician Questions: Can the P32AF-13 be mounted in any orientation? While versatile, the factory calibration is performed with the diaphragm in a vertical plane. Installing the unit in other positions may shift the setpoint by approximately 0.07" WC. It is recommended to recalibrate the setpoint using the internal adjusting screw if horizontal mounting is required. Is this switch suitable for combustion air applications? The P32AF-13 is primarily an operating control for general air flow and duct applications. For dedicated combustion air proofing, refer to the specific LIT-125430 technical bulletin and ensure the model matches the specific safety requirements for fuel-burning equipment. What is the maximum overpressure limit for the sensor? The unit features a proof pressure of 12" WC and a burst pressure rating of 27.7" WC. Rapid pressure spikes beyond these limits can damage the internal diaphragm and compromise switching accuracy. This item is not eligible for free shipping. 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.
