Johnson Controls P70AA-1 Pressure Control

The Johnson Controls P70AA-1 is a professional-grade single pole high pressure control designed for precise regulation in commercial refrigeration and air conditioning systems. This electromechanical SPST pressure switch features an "Open-Low" action, making it an ideal choice for condenser fan cycling control and high-side pressure monitoring. Built with a rugged all-steel case and cover, it provides long-term reliability for contractors managing non-corrosive refrigerants. The unit offers a wide adjustment range from 20" Wc to 100 Psi, allowing for fine-tuned setpoints to maintain optimal system performance. Installation is streamlined via the 1/4" flare nut with capillary connection, ensuring a secure fit to standard pressure tap points. The Sight-Set calibrated scale allows for easy visibility of settings without removing the NEMA 1 enclosure cover. By utilizing Johnson Controls/Penn pressure controls, technicians ensure their equipment operates within safe parameters while preventing unnecessary compressor wear from improper head pressure.

• Rugged Durability: The all-steel construction protects internal bellows and switch contacts from harsh mechanical room environments.
• Versatile Compatibility: Engineered for use with non-corrosive refrigerants, air, water, and oil in diverse HVACR applications.
• Precise Adjustment: Features Sight-Set calibration for accurate field setpoints across the 20" Wc to 100 Psi range.
• Reliable Switching: Single-pole single-throw (SPST) mechanism ensures positive contact make-and-break for load-carrying circuits.
• Contractor Preferred: Standard 1/4 inch flare nut and 36-inch capillary simplify mounting and connection to high-side ports.

Common Questions

What is the primary application for the P70AA-1?
This model is primarily used as a condenser fan cycling control. Its "Open-Low" switch action breaks the circuit on a pressure drop, allowing the fan to cycle off when head pressure falls below the setpoint, maintaining stable operation in varying ambient conditions.

Can this pressure control be used with R-410A systems?
While the P70 Series is compatible with many high-pressure refrigerants, you must verify that the 100 Psi maximum range and overpressure ratings meet the specific requirements of your R-410A high-side system, as these often require higher cutout points.

Does this unit require a manual reset?
No, the P70AA-1 is an automatic reset control. Once the pressure rises back above the differential setting, the switch will automatically close to resume normal operation without technician intervention.

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.