Johnson Controls P70AA-118 Pressure Control

The Johnson Controls P70AA-118 is a professional-grade single pole high pressure control designed specifically for condenser fan cycling and high-side pressure management in commercial refrigeration and HVAC systems. As a veteran-preferred SPST pressure switch, it features a "Close High, Open Low" action, ensuring precise head pressure control across a broad range of 100 to 400 psi. This model is the direct technical replacement for the legacy P70AA-148, offering seamless backward compatibility for older Johnson Controls-Penn installations. Built with a rugged all-steel case, it includes a 36-inch capillary with a 1/4-inch flare nut for reliable line integration and a Sight-Set calibrated scale for fast, accurate field adjustments. Engineered for multi-refrigerant versatility, it is fully compatible with R-22, R-410A, R-134A, R-12, R-500, and R-502, provided the media is non-corrosive. With a maximum overpressure rating of 475 psig and a field-adjustable differential of 35 to 200 psi, this high-pressure control provides the durability and setpoint stability required by contractors for heavy-duty head pressure control applications.

Key Benefits:

• Direct Replacement: Purpose-built to replace the P70AA-148 without requiring bracket modifications.
• Broad Refrigerant Compatibility: Field-proven performance with R-22, R-134A, and R-410A systems.
• Rugged Construction: Features a heavy-duty all-steel enclosure and a long-life SPST switch mechanism to prevent contact bounce.
• Accurate Setpoints: The Sight-Set calibrated scale allows for immediate visual verification of pressure settings during condenser fan cycling setup.
• Flexible Installation: Equipped with a 36-inch capillary and a standard 1/4-inch flare nut for reach and reliability in tight mechanical spaces.

Common Questions:

Is the P70AA-118 compatible with R-410A high-pressure systems?
Yes, while originally rated for legacy gases, its 400 psi range and 475 psig overpressure limit make it suitable for head pressure control on many modern R-410A commercial condensing units.

How do I adjust the pressure differential on this control?
The differential is field-adjustable between 35 and 200 psi. Use the internal differential screw to fine-tune the "cut-in" and "cut-out" points to prevent short-cycling of the condenser fan.

Will this replace my existing P70AA-148 pressure switch?
The P70AA-118 is the official direct replacement for the P70AA-148, maintaining the same electrical ratings and physical mounting footprint for a drop-in HVAC pressure control swap.

This item is not eligible for free shipping.

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.