Johnson Controls P32AC-2 Pressure Switch

Sensitive Differential Pressure Switch, SPDT, 0.05" Wc to 5" Wc, Adjustable with Scale Plate, U Bracket, Nema 1, 1/2 Horsepower, 120/240 Vac, Supplied with 1/4" Compression Fitting, 4" Extension Tube, Mounting Screws, "O" Gasket and Angle Barb Fitting Installed

Johnson Controls P32AC-2 Pressure Switch – Adjustable Differential Pressure Switch (0.05"–5" WC)

The Johnson Controls P32AC-2 Pressure Switch is a reliable and precise adjustable differential pressure switch designed for monitoring low air or gas pressures in HVAC, industrial, and commercial control applications. Featuring a sensitive Buna-N diaphragm, SPDT contacts, and an easy-to-read internal setpoint scale, this switch delivers consistent performance and long-term durability.

With a wide adjustable setpoint range from 0.05 to 5 inches of water column, the P32AC-2 provides accurate pressure control and automatic reset operation. Its rugged zinc-plated steel enclosure, NEMA 1 rating, and versatile mounting options make it suitable for a wide range of installations.

Key Features & Benefits

• Adjustable setpoint range: 0.05" to 5" WC

• SPDT relay output: Reliable switching for control applications

• Easy-to-read internal setpoint scale for quick adjustment

• Automatic reset with progressive differential control

• Durable metallic housing with NEMA 1 enclosure

• Versatile mounting options including U-bracket and keyhole mounting

• Supplied with fittings and hardware for fast installation

• UL approved for safety and reliability

• One-year manufacturer warranty

Technical Specifications

• Brand: Johnson Controls

• Model: P32AC-2

• Type: Adjustable Differential Pressure Switch

• Direction: Uni-Directional

• Measurement: Inches of Water Column (WC)

• Setpoint Range: 0.05 – 5 in WC

• Differential (Progressive): 0.025" to 0.6" WC

• Repeatability: ±10% over full range

• Reset: Automatic (by differential)

• Sensor Type: Buna-N Diaphragm

• Wetted Parts: Buna-N

• Media Compatibility: Inert dry air, liquid, gas

Electrical Specifications

• Contact Type: SPDT (R=Common, B=NC, Y=NO)

• Relay Action: R to Y on pressure increase

• Contact Rating:

  • 5 A general

  • 10 A resistive, 120–277 VAC (AC only)

• Power Required: Switch (no external power)

• Wiring Terminations: 3 screw terminals, <12 AWG

Mechanical & Environmental

• Process Connection:

  • 1/8" FNPT

  • 1/2" NPSM fitting

• Connection Size: 1/8 in

• Housing Material: Zinc-plated steel & polycarbonate

• Enclosure Rating: NEMA 1

• Operating Temperature: -40° to 165°F (-40° to 75°C)

• Operating Humidity: 10–90% non-condensing

• Max Operating Pressure (Proof): 12" WC (2.99 kPa)

• Overpressure (Burst): 27.7" WC (6.89 kPa)

Mounting & Dimensions

• Mounting: Vertical with 2-keyhole bracket, U-bracket or L-bracket

Included Components

• 1/4" Compression fitting

• 4" Extension tube

• Angle barb fitting (installed)

• Mounting screws

• “O” gasket

Approvals & Warranty

• UL Approval: UL File #MH10588

Ideal for HVAC air pressure monitoring, burner control, filter monitoring, and industrial control systems, the Johnson Controls P32AC-2 Pressure Switch delivers dependable performance, precise adjustability, and long service life.