Johnson Controls P70CA-1 Pressure Control

The Johnson Controls P70CA-1 is a professional-grade single pole low pressure control designed for heavy-duty commercial refrigeration and HVAC applications. Featuring an open high switch action, this SPST pressure switch is commonly utilized for capacity control and high-side cutout in systems using non-corrosive refrigerants. It operates within a robust 20" Hg to 100 psi range and includes an adjustable differential (6 to 50 psi), allowing technicians to fine-tune system cycling for maximum efficiency. The unit comes equipped with a 36" capillary and a 1/4" flare nut for versatile mounting. As a veteran-preferred HVAC pressure controller, the P70CA-1 serves as a direct P70CA-65 replacement and P70CA-93 replacement, ensuring seamless mechanical compatibility during field service. Its all-steel case provides rugged protection for internal bellows, making it a reliable choice for refrigeration pressure limiting and automated system protection.

• Direct Replacement Logic: Field-ready substitute for P70CA-65 and P70CA-93 models, minimizing downtime during retrofits.
• Precision Tuning: The adjustable differential and Sight-Set calibrated scale allow for visible, accurate setpoint adjustments without removing the NEMA 1 cover.
• High Electrical Capacity: Rated for up to 17 Amps at 240V, providing direct control of single-phase motors without additional contactors in many configurations.
• Rugged Reliability: Features an all-steel housing and 36-inch capillary tube designed to withstand high-vibration environment typical of commercial mechanical rooms.

What is the primary application for an "Open High" switch?
In the Johnson Controls P70 series, the Open High action (P70CA models) is typically used for capacity control or as a high-pressure cutout. The contacts open when pressure rises to the high setpoint, protecting the compressor or managing staged cooling.

Can this be used with R-410A or R-22?
Yes, the P70CA-1 is compatible with most common non-corrosive refrigerants. However, technicians should always verify that the system's maximum operating pressure does not exceed the 325 psig overpressure limit of the control bellows.

How do I install the capillary to prevent leaks?
Always include a vibration loop (slack) in the 36" capillary. Ensure the pressure tap is located on the topside of the refrigerant line to prevent oil or sediment from accumulating in the bellows, which can lead to premature failure or inaccurate switching.

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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.