Johnson Controls P170KA-1 Pressure Control

The Johnson Controls P170KA-1 is a commercial-grade high pressure cutout control engineered for precision monitoring in HVACR systems. Designed as a direct technical equivalent to the P170KA-1C, this unit features a 4-wire, 2-circuit switch configuration that allows for simultaneous high-side protection and the integration of an external alarm or status indicator. The sensing element utilizes a high-durability pressure-actuated bellows to manage a broad operating pressure range of 50 to 500 psi, making it a versatile solution for systems utilizing most non-corrosive refrigerants, including high-pressure R-410A applications.

Built with an all-steel case and cover, the P170KA-1 provides a manual reset lockout mechanism to ensure system shutdown remains active until a technician performs a manual inspection and reset. The 1/4" male flare connector facilitates a secure, leak-resistant connection to the high-side tap. Contractors favor this series for its "Sight-Set" calibrated scale, which allows for accurate setpoint adjustments without the need to remove the enclosure. This control is specifically optimized for refrigeration pressure control where unmonitored equipment requires a fail-safe manual intervention circuit after a high-pressure event.

• Dual-Circuit Versatility: The 4-wire 2-circuit design (Line M1 Close-High, Line M2 Open-High) simplifies the installation of remote alarm systems or secondary control logic.
• Manual Reset Security: The trip-free lockout prevents automatic cycling after a high-limit event, protecting the compressor and system components from repeated stress.
• Universal Compatibility: Specifically rated for non-corrosive refrigerants, this all-range control is a reliable replacement for standard high-pressure applications in commercial cooling.
• Rugged Construction: The steel enclosure is designed to withstand the harsh vibrations and environmental conditions typical of mechanical rooms and rooftop installations.

What is the difference between P170KA-1 and P170KA-1C?
Technically, these units are identical in form, fit, and function. The P170KA-1 serves as a direct functional replacement for the 1C variant in refrigeration and AC applications.

Can this control be used with R-410A systems?
Yes, the 500 psi maximum range and 525 psi bellows overrun pressure rating make it suitable for high-pressure setups using non-corrosive refrigerants such as R-410A.

How do I wire the alarm circuit on this 4-wire control?
Wiring should follow the Line M1 close-high logic for the auxiliary circuit, which closes the contact to trigger a signal when the main Line M2 circuit opens to shut down the load.

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.