P72AA-27C Johnson Controls Pressure Control

Overview

The Johnson Controls P72AA-27C is a Double-Pole Single-Throw (DPST) electromechanical pressure control designed primarily for high-pressure applications, such as condenser fan cycling control, head-pressure control, and high-pressure cut-out in commercial refrigeration and air conditioning systems. It features an Open Low switch action that responds directly to system pressure drops.

Features

• All-steel case and cover provide rugged, long-lasting protection for internal components.
• Sight-Set calibrated pressure adjustment displays a visible scale for easy adjustments without removing the cover.
• DPST switch with load-carrying contacts allows for the direct control of high-horsepower motors.
• Equipped with a 36-inch capillary with a 1/4-inch flare nut for flexible installation.

Specifications

• Switch Action: DPST Open Low
• Pressure Range: 100 to 400 psi (690 to 2,758 kPa)
• Differential Range: 35 to 200 psi (241 to 1,379 kPa)
• Pressure Connection: 36 in. capillary with 1/4 in. flare nut
• Maximum Working Pressure: 475 psig (3,275 kPa)
• Electrical Ratings: Direct control of 208-240 V single-phase motors up to 3 hp, and 208-220 V 3-phase motors up to 5 hp
• Enclosure Type: NEMA 1 standard

Applications

• Commercial refrigeration and air conditioning systems
• Condenser fan cycling control
• High-pressure cut-out and head-pressure control
• Suitable for use with air, water, and other common non-corrosive refrigerants