Johnson Controls P170DA-1 Pressure Control

The Johnson Controls P170DA-1 is a heavy-duty high pressure cutout control designed for rugged performance in commercial refrigeration and air conditioning systems. This SPST open-high pressure switch features a manual reset lockout mechanism, ensuring that once the system crosses the user-defined safety threshold, it remains offline until a technician performs a manual inspection. This "trip-free" lockout design is essential for protecting unmonitored equipment from repeated high-pressure cycling and potential compressor damage. Built with an all-steel case and cover, the P170DA-1 is engineered for longevity in demanding environments and is fully compatible with non-corrosive refrigerants.

For streamlined installation and maintenance, this unit utilizes the Sight-Set calibrated pressure adjustment, allowing for precise setpoint visualization through a 50 to 500 PSIG range without removing the cover. It includes a standard 1/4" male flare connector for secure attachment to high-side pressure taps. The P170DA-1 is technically identical to the P170DA-1C, providing a direct drop-in solution for head pressure control and system safety limit applications. This electromechanical control is a primary choice for contractors requiring reliable refrigeration pressure limiting performance.

• Manual Reset Safety: Provides a "trip-free" lockout that requires human intervention before the system can restart, preventing damage from recurring high-pressure faults.
• Sight-Set Calibration: Features a visible scale for easy adjustments and accurate setpoint verification across the 50 to 500 PSIG range.
• Rugged Construction: Durable all-steel case and NEMA 1 enclosure protect internal bellows and snap-action switch components.
• Direct Compatibility: Equipped with a 1/4" male flare connector and approved for use with all common non-corrosive refrigerants.
• Industrial Reliability: Often used as a limit protection control for commercial HVACR compressors and condenser fan cycling applications.

What is the difference between the P170DA-1 and the P170DA-1C?
Technically, these two models are identical. The difference typically lies in the packaging or distribution channel branding, but the internal specifications, pressure range, and manual reset function remain the same.

Can this be used with ammonia?
No. The P170DA-1 is designed for non-corrosive refrigerants only. Applications involving ammonia require specific stainless steel or ammonia-compatible pressure control models.

How do I adjust the cut-in pressure?
On manual reset models like the P170DA-1, there is no adjustable cut-in or differential. You adjust the high-pressure cutout point using the range screw, and the system must be manually reset once the pressure drops back below the designated threshold.

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.