Johnson Controls P170AA-400 Pressure Control

The Johnson Controls P170AA-400 is a high-performance high pressure cutout control designed for heavy-duty commercial refrigeration and HVAC applications. This SPST pressure switch features an "Open-Low" action, making it a standard choice for condenser fan cycling control and high-pressure system protection. Built with a rugged NEMA 1 all-steel enclosure, the P170AA-400 provides reliable operation for systems utilizing non-corrosive refrigerants. It operates across a broad 100-470 PSIG range with an adjustable differential spanning 35 to 200 PSI, allowing technicians to fine-tune system response. The unit is equipped with a 1/4" male flare nut pressure connection and supports standard multi-tap electrical ratings of 120, 208, and 240 VAC. Designed for direct motor control, its high-capacity contacts ensure a quick break and long-term durability in demanding industrial environments. Contractors rely on this automatic reset pressure control for its sight-set calibrated scale, which enables precise setpoint adjustments without removing the cover, streamlining field maintenance and system commissioning.

• Versatile Application: Ideal for condenser fan cycling and high-pressure cutout in systems using R-22, R-134A, R-404A, and other non-corrosive fluids.
• Precise Tuning: Features a 100 to 470 PSIG adjustable range and a wide 35 to 200 PSI differential for optimized cycling.
• Simplified Service: Sight-set calibrated scale allows for fast, visible pressure adjustments in the field.
• Rugged Construction: Durable NEMA 1 steel housing protects internal bellows and SPST switch components from debris and impact.
• Direct Motor Control: Robust electrical ratings (up to 16.0 FLA at 120V) allow for the direct switching of many single-phase motors.

What is the difference between Open-Low and Open-High action?
The P170AA-400 is an "Open-Low" control, meaning the contacts open when the pressure drops to the low setpoint (typically used to cycle fans off). In contrast, "Open-High" controls are used for high-pressure safety cutouts to stop the compressor when pressure exceeds the limit.

Can this control be used with Ammonia systems?
No, this specific model is designed for non-corrosive refrigerants. For ammonia applications, a stainless-steel bellows model (such as the P70AA-119) must be used.

Does this unit require a manual reset?
No, the P170AA-400 is an automatic reset control, meaning it will restore the circuit once the pressure returns to the differential setpoint 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.