Johnson Controls P32AF-2 Sensitive Differential Pressure Switch, SPDT

Description

The Johnson Controls P32AF-2 is a sensitive differential pressure switch engineered for precise pressure monitoring and control in HVAC and building automation applications. Featuring a Single-Pole Double-Throw (SPDT) switching action, this switch responds to very low differential pressures, making it ideal for air handling units, duct pressure monitoring, filter status detection, and fan proving applications.

Key Features

• SPDT switching action for versatile normally-open or normally-closed circuit configurations
• Wide adjustable differential pressure range: 0.05″ W.C. to 5″ W.C.
• Convenient scale plate for easy, accurate setpoint adjustment in the field
• U-bracket mounting hardware included for straightforward installation
• NEMA 1 enclosure rating suitable for indoor, general-purpose environments
• Rated for 1/4 horsepower motor loads
• Compatible with 120/240 VAC power systems

Specifications

• SKU: P32AF-2
• Brand: Johnson Controls
• Switch Type: SPDT (Single-Pole Double-Throw)
• Pressure Range: 0.05″ W.C. to 5″ W.C. (adjustable)
• Setpoint Adjustment: Adjustable with scale plate
• Mounting: U-bracket included
• Enclosure: NEMA 1 (indoor, general-purpose)
• Horsepower Rating: 1/4 HP
• Voltage: 120/240 VAC

Typical Applications

• Air handling unit (AHU) fan proving and status monitoring
• Duct static pressure control and monitoring
• Filter clog detection and dirty filter indication
• Blower and exhaust fan operation verification
• Building automation and HVAC control systems

The P32AF-2’s high sensitivity at the low end of its range — starting at just 0.05″ W.C. — makes it particularly well-suited for applications requiring detection of minimal pressure differentials. The included scale plate eliminates guesswork during commissioning, while the U-bracket simplifies mounting to ductwork, panels, or equipment enclosures. With dual-voltage compatibility (120/240 VAC) and a NEMA 1 enclosure, this switch integrates seamlessly into a wide range of commercial and light industrial HVAC installations.