Johnson Controls P170NA-1 Pressure Control

The Johnson Controls P170NA-1 is a performance-grade dual pressure control engineered for standard commercial refrigeration and large-capacity air conditioning systems. This mechanical controller integrates both high-side and low-side protection within a single all-steel case, providing a compact footprint for streamlining your manifold or cabinet layouts. Utilizing a Single-Pole Single-Throw (SPST) switch, the unit executes a rapid cutout when system pressures deviate beyond your set parameters, protecting the compressor motor from damage caused by loss of charge or excessive head pressure.

The low side is fully adjustable from 20" Hg to 100 psi, featuring a fixed manual reset differential specifically designed to prevent short-cycling in critical pump-down applications. For the high side, the P170NA-1 supports a wide range of 100 to 500 psi, ensuring compatibility with higher pressure refrigerants like R-410A. Both sides utilize a trip-free manual reset lockout, a vital safety mechanism that requires on-site technician intervention before the equipment can be restarted, effectively preventing unattended operation under fault conditions. Connection is made via standard 1/4" external flare connectors, and the sight-set calibrated scales allow for precise field adjustments without the need for additional gauges during the initial setup.

Key Benefits for HVACR Contractors:

• Dual-Side Protection: Combines low-pressure cutout and high-pressure limit control in one rugged NEMA 1 enclosure.
• Manual Reset Safety: High and low side lockdowns ensure the system remains offline until a technician identifies and corrects the underlying pressure issue.
• Heavy-Duty Construction: Features an all-steel cover and internal bellows designed for high-vibration commercial environments.
• Universal Field Compatibility: Rated for up to 17 amps at 240 VAC, making it suitable for direct control of single-phase motors.
• Precision Installation: The 1/4" male flare connector and included mounting bracket allow for straightforward integration into existing liquid or suction lines.

Common Questions & Technical Support:

• Is the P170NA-1 compatible with R-410A? Yes, its high-side range of up to 500 psi is specifically designed to handle the operating pressures of R-410A refrigeration systems.
• What is the difference between this and the P170MA-1? The P170NA-1 features manual reset on both the high and low pressure sides, whereas the MA models typically feature automatic reset on the low side.
• Can this control be mounted in any orientation? For optimal drainage and to prevent debris accumulation in the bellows, it should be mounted in the upright and level position.

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.