Johnson Controls P70NA-1 Pressure Control

The Johnson Controls P70NA-1 is a professional-grade dual pressure control designed for heavy-duty commercial refrigeration and air conditioning systems. This mechanical switch provides critical compressor protection by responding directly to high and low-side pressure fluctuations. Engineered for all-range refrigerant compatibility, this unit is field-ready for systems utilizing R-12, R-22, R-134A, R-500, and R-502. The low-pressure side features a range of 20" Wc to 100 psi, while the high-pressure side operates between 100 psi and 500 psi. Both settings utilize a manual reset lockout, ensuring a technician inspects the system before a restart occurs after a trip.

Built with a rugged all-steel case, the P70NA-1 includes the Sight-Set calibrated scale, allowing you to verify pressure settings at a glance without pulling the cover. The SPST switching action is housed in a NEMA 1 enclosure, and the unit comes equipped with a 36-inch capillary tube featuring a 1/4" flare nut for a secure, leak-resistant connection to the refrigerant line. For contractors requiring a reliable manual reset pressure switch that stands up to vibration and harsh mechanical room environments, this Johnson Controls model is a standard for pump-down and safety cut-out applications.

Key Benefits:

• Broad Compatibility: Rated for "All Range" non-corrosive refrigerants including R-22 and R-134A.
• Visual Verification: Integrated Sight-Set scales allow for easy setpoint monitoring during preventative maintenance.
• Safety Lockout: Dual-side manual reset prevents automatic short-cycling and protects the compressor from damage during extreme pressure events.
• Durable Housing: The heavy-duty steel enclosure protects internal components from the mechanical stress of commercial HVACR environments.
• Precision Connection: Includes a 36" capillary with a standard 1/4" flare nut for versatile installation.

Common Questions:

What is the difference between manual and automatic reset on the P70NA-1?
The P70NA-1 is a manual reset model, meaning once the system hits the high or low cut-out point, the switch locks out. A technician must manually depress the reset button to restore power to the control circuit, ensuring the cause of the pressure spike is addressed.

Does this control work with modern HFC refrigerants?
Yes, while it is labeled for R-12 and R-502, it is fully compatible with R-134A and other non-corrosive refrigerants within its pressure range specified for HVAC pressure controls.

Can I mount this indoors or outdoors?
This model comes with a NEMA 1 enclosure, which is intended for indoor use or protected mechanical rooms. If you require outdoor mounting, ensure it is housed within a secondary weather-tight enclosure or look for a NEMA 3R rated equivalent.

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.