Johnson Controls P72LA-1 Pressure Control

The Johnson Controls P72LA-1 is a professional-grade DPST dual pressure control engineered for direct power and safety cycling in commercial refrigeration and HVAC systems. As an "All Range" controller, this double-pole single-throw switch provides robust management for R-12, R-22, R-134A, R-500, and R-502 refrigerants. It is specifically designed to handle high-load applications, capable of controlling 208/240 VAC single-phase motors up to 3 hp and 208/220 VAC 3-phase motors up to 5 hp without the need for additional contactors. The unit features sight-set calibrated scales, allowing for precise low pressure range adjustments from 20" Wc to 100 psi and high pressure range settings from 100 psi to 425 psi. With a 36-inch capillary with 1/4" flare nut and included mounting bracket, this dual pressure switch ensures a versatile and secure installation for any commercial HVACR technician requiring dependable compressor protection.

• Heavy-Duty DPST Switching: The Johnson Controls P72LA-1 features load-carrying contacts that provide direct control of high-horsepower motors, reducing the need for intermediate relays.
• Precise Pressure Management: Includes a low pressure differential adjustable from 6 to 50 psi and a fixed high-pressure cutout to maintain safe operating parameters.
• Rugged Construction: Built with an all-steel case and cover to protect internal components in demanding mechanical room environments.
• Universal Application: The All Range dual pressure control is compatible with multiple non-corrosive refrigerants, making it an essential stock item for service trucks.
• Efficient Calibration: Sight-Set scales allow for accurate pressure control settings without the need to remove the cover during routine maintenance.

Is the Johnson Controls P72LA-1 compatible with R-410A?
While the P72LA-1 is rated for "All Range" legacy refrigerants, technicians should verify that the 425 psi high-pressure limit meets the specific safety requirements of high-pressure R-410A systems before installation.

How do I wire a DPST dual pressure control for a 3-phase motor?
When using the Johnson Controls P72LA-1 for 3-phase applications, it is typically used to interrupt two legs of the power supply for motors up to 5 hp at 208/220 VAC. Always reference the P72LA-1 wiring diagram located inside the cover for terminal designations.

What is the difference between the P70 and P72 series?
The P70 series typically utilizes SPST or SPDT switching for pilot duty or smaller loads, whereas the P72 series utilizes a double-pole (DPST) configuration for higher electrical ratings and direct motor control.

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.