Johnson Controls P100AA-3 Pressure Control

The Johnson Controls P100AA-3 is a professional-grade encapsulated pressure control designed for heavy-duty HVACR applications, specifically serving as a reliable low-pressure cutout or condenser fan cycling switch. Featuring an SPST (Single Pole Single Throw) configuration with an open-low action, this control is factory-set to open at 150 PSIG and close at 225 PSIG. The automatic reset functionality ensures consistent system operation without manual intervention after pressure stabilization. Its direct-mount design, typically utilizing a 1/4 in. SAE female flare with an internal Schrader valve depressor, allows for a compact footprint and seamless integration into existing lines. Built with open construction and rated for 120/240 Vac, it provides high-precision refrigerant pressure monitoring for commercial refrigeration, ice machines, and air conditioning units. This tamper-proof, non-adjustable switch is compatible with all common non-corrosive refrigerants, offering the durability required for rigorous contractor field installations.

• Factory-Calibrated Precision: Non-adjustable setpoints of 150 PSIG (Open) and 225 PSIG (Close) eliminate the risk of field tampering and ensure repeatable performance.
• Compact Direct Mounting: The lightweight, encapsulated housing allows for direct attachment to refrigeration lines, reducing installation time and physical strain on piping.
• Versatile Electrical Ratings: Supports 120/240 Vac contact ratings, making it suitable for a wide range of pilot duty and motor control applications.
• Environmental Protection: The dust-tight, encapsulated switch mechanism is designed to withstand the harsh ambient conditions found in outdoor condensers and industrial mechanical rooms.

What is the typical application for an open-low pressure control?
In HVACR systems, an open-low switch like the P100AA-3 is primarily used for low-pressure cutout to protect the compressor from loss of charge or for condenser fan cycling to maintain head pressure in low ambient conditions.

Is the P100AA-3 compatible with R-410A refrigerants?
Yes, the P100 series is engineered for use with all non-corrosive refrigerants, including R-410A, R-22, and R-134a, provided the system pressures align with the 150/225 PSIG setpoints.

Does this unit require a separate mounting bracket?
No, this is a direct-mount control. It is designed to be threaded directly onto a 1/4 inch flare fitting, which supports its weight without the need for additional external brackets.

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.