P32AF-1C Johnson Controls Pressure Control

Overview

The Johnson Controls P32AF-1C is a sensitive differential pressure switch designed to sense airflow and pressure changes in ducts for commercial HVAC and Building Automation Systems (BAS). Featuring a close switching differential, this compact device can detect differential pressure, low positive gauge pressure, or vacuum by adjusting the open sensing ports, providing reliable electromechanical control.

Features

• Easy-to-read internal setpoint scale with simple screw adjustment
• Small, compact design with versatile direct or L-bracket mounting options
• Durable construction featuring a zinc-plated steel and polycarbonate NEMA 1 enclosure
• High-performance sensing via a sensitive Buna-N diaphragm and dust-tight snap switch
• Precise setpoint switching repeatability

Specifications

• Set Point Range: 0.05 to 5.0 inches Water Column (W.C.)
• Switching Differential: Close progressive differential from 0.025 to 0.6 inches W.C.
• Contact Form: SPDT (Single Pole Double Throw); 10 A resistive at 120-277 VAC, 1/4 hp
• Operating Temperature: -40°F to 165°F (-40°C to 74°C)
• Maximum Pressure: 1 psig maximum pressure at either end; 12 inches W.C. proof pressure
• Process Connections: High Pressure: metal 1/8 in. internal NPT / 1/2 in. NPSM external; Low Pressure: molded 1/8 in. internal NPT

Applications

• Airflow and pressure proving with electric duct heaters, humidifiers, and other equipment
• Maximum airflow control for variable air volume (VAV) systems
• Reheat duct powered systems
• Clogged filter detection in ventilation systems
• Detection of icing on air conditioning coils to initiate defrost cycles