Johnson Controls P72AA-1 Pressure Control

The Johnson Controls P72AA-1 is a robust DPST low pressure control designed for heavy-duty commercial refrigeration and HVAC systems. Engineering for reliability, this two-pole pressure switch features a Close High Open Low action, making it an essential component for high-current load applications where direct control of single-phase motors is required without the need for additional contactors. This model operates within a pressure range of 20" Wc to 100 psi, offering a field-adjustable differential range of 7 psi to 50 psi to prevent short-cycling and ensure precise system modulation. The 325 psi max bellows overpressure rating provides a necessary safety margin for high-side surges, and the 36-inch capillary with 1/4 inch flare nut allows for versatile positioning in tight mechanical rooms.

• Dual Pole Switching: The DPST configuration allows for simultaneous interruption of both sides of the line, enhancing safety and control in low pressure cutout sequences.
• Variable Differential: Features an adjustable 7 to 50 psi differential to fine-tune refrigeration cycles based on specific ambient conditions and load requirements.
• High Overpressure Tolerance: Capable of withstanding up to 325 psi at the bellows, ensuring the P72AA-1 pressure control remains intact during system spikes.
• Universal Mounting: Includes a universal mounting bracket to simplify field replacement of legacy Penn pressure controls or competitive units.

Common Questions

How do I wire the P72AA-1 for a dual-pole application?
The Johnson Controls P72AA-1 features four terminals for DPST operation. This allows you to break both legs of a 208/230V circuit simultaneously, which is standard practice for low pressure safety applications in commercial condensing units.

What is the maximum electrical load for this pressure switch?
This heavy-duty pressure control is rated for high-amperage applications, typically up to 24 FLA at 120V and 20 FLA at 240V, making it suitable for direct compressor motor control.

Can the P72AA-1 be used with all refrigerants?
The P72AA-1 is compatible with standard non-corrosive refrigerants commonly found in commercial HVACR systems, though always verify bellows compatibility if using newer A2L synthetic blends.

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.