Johnson Controls P70KA-1 Pressure Control

The Johnson Controls P70KA-1 Pressure Control is a heavy-duty high pressure cutout control engineered for industrial and commercial refrigeration and air conditioning systems. This "All Range" controller is compatible with non-corrosive refrigerants including R-12, R-22, R-134A, R-500, and R-502. Featuring a 4-wire, 2-circuit switch configuration, it provides independent control over the main load and an integrated alarm circuit. The primary L-M2 contacts open on high pressure to protect the compressor, while the L-M1 contacts close on high pressure to trigger notification systems.

Designed for mission-critical limit protection, this Penn P70 series control includes a manual reset lockout mechanism that ensures the system remains offline until a technician inspects the cause of the high-side event. It operates within a 50 to 450 Psig range and features a rugged all-steel case with a NEMA 1 enclosure. The unit comes equipped with a 36-inch capillary terminating in a 1/4-inch flare nut for secure attachment to the high-side pressure tap. With a 525 Psig maximum bellows overrun pressure, this control is a standard choice for contractors looking for reliability in head pressure control and high-limit cutout applications.

• Dual-Circuit Versatility: The 4-wire, 2-circuit lockout design allows for simultaneous compressor shutdown and remote alarm activation.
• Enhanced Safety: The manual reset feature prevents automatic cycling after a high-pressure trip, protecting hardware from repeated stress.
• Broad Compatibility: Rated for use with air, water, lube oil, and a wide variety of non-corrosive refrigerants.
• Field-Proven Durability: Constructed with an all-steel case and long-life contact structure to prevent contact bounce and extend service life.
• Easy Installation: Includes a universal mounting bracket and high-visibility "Sight-Set" calibrated scale for precise setpoint adjustment.

What is the difference between Line-M1 and Line-M2 switching?
In the P70KA-1, the Line to M2 circuit is the main motor load which opens on pressure rise. The Line to M1 circuit is the auxiliary circuit that closes on pressure rise, typically used for an alarm or indicator light.

Can I override the manual reset?
No. The trip-free manual reset mechanism is designed so it cannot be overridden by blocking or tying down the reset button; the sensed pressure must drop significantly below the cutout point (typically 70 psig) before it will reset.

Is this control compatible with R-410A systems?
While this "All Range" model is listed for R-22 and R-134A, R-410A systems often require higher pressure ratings. Always verify your system's maximum operating pressure against the 450 Psig range of this specific unit.

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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.