Johnson Controls P170AB-2 Pressure Control

The Johnson Controls P170AB-2 is a heavy-duty single pole single throw (SPST) low pressure control engineered for critical cycling and high-pressure cutout applications. This industrial pressure switch operates with an open-low action, featuring a versatile pressure range from 20" Hg to 100 psi. Designed for reliability in commercial refrigeration and HVAC systems, it handles non-corrosive refrigerants including R-22, R-404A, and R-134a. The unit utilizes a 7 to 50 psi adjustable differential, allowing technicians to precision-tune the system setpoints via the limited knob mounted on the differential screw. With electrical ratings for 120/208/240 VAC, this control ensures compatibility with standard power configurations. The 1/4" male SAE flare connector provides a secure, leak-resistant mechanical interface. This model is spec-equivalent to the P170AB-2C, making it a drop-in replacement for existing HVAC service and repair projects requiring automatic reset pressure controls.

• Wide Operating Range: Covers a broad spectrum of low-side monitoring from vacuum to 100 psi, reducing the need to carry multiple SKUs.
• Field-Proven Durability: The robust SPST mechanism ensures high-cycle reliability in demanding commercial environments.
• Simplified Wiring: Standardized terminal markings and electrical ratings facilitate rapid integration into existing control circuits.
• Precision Control: The limited knob design prevents over-adjustment while allowing specific differential tuning for optimized compressor cycles.

Is the P170AB-2 compatible with ammonia systems?
No, this control is designed specifically for non-corrosive refrigerants. For ammonia applications, a stainless steel bellows model is required.

Does this unit require a manual reset after a low-pressure trip?
This specific model features automatic reset functionality, meaning the switch will close once the pressure rises above the cut-in point determined by your differential setting.

What is the purpose of the 1/4" external flare fitting?
The flare connection allows for a direct mechanical tie-in to the system's high or low side without the need for brazing, ensuring a clean installation.

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.