Johnson Controls P72AA-27 Pressure Control

The Johnson Controls P72AA-27 is a heavy-duty two pole high pressure control designed for demanding commercial refrigeration and HVACR applications. This DPST pressure switch is engineered for direct control of 208-240V single-phase motors up to 3 hp and 208-220V 3-phase motors up to 5 hp, often eliminating the need for external magnetic starters. With a pressure range of 100 to 400 psi and an adjustable differential from 35 to 200 psi, it provides precise head pressure fan cycling and high-pressure cutout functionality. The unit features an all-steel case and cover for maximum durability in mechanical rooms. This model includes a 36-inch capillary with 1/4" flare nut and a universal mounting bracket for versatile installation. Designed for use with non-corrosive refrigerants, the bellows are rated for a maximum overpressure of 475 psi, ensuring reliable performance during system pressure spikes.

• Direct Motor Control: The double-pole, single-throw contacts handle high-amp loads, allowing direct wiring to compressors and fans without additional contactors.
• Rugged Enclosure: The NEMA 1 all-steel housing protects internal components from mechanical damage in industrial environments.
• Precise Tuning: Features a visible "Sight-Set" calibrated scale for quick and accurate setpoint adjustments without removing the cover.
• Versatile Compatibility: Designed for head pressure control across a wide range of common non-corrosive refrigerants including R-22, R-134a, and R-404A.
• Flexible Installation: The included 3-foot capillary and mounting bracket simplify positioning in tight refrigeration racks or condenser cabinets.

What is the primary application for the P72AA-27?
This control is primarily used for high-pressure cutout, condenser fan cycling, and head pressure management in commercial refrigeration systems.

Does this switch require a manual reset?
No, the P72AA-27 is an automatic reset control, meaning it will close the circuit once the pressure drops below the differential setting.

Is this compatible with ammonia systems?
No, this specific model is designed for use with air, water, or non-corrosive refrigerants. For ammonia applications, a specialized stainless steel bellows model must be used.

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.