Johnson Controls P20CA-75 Pressure Control

The Johnson Controls P20CA-75 Pressure Control is a professional-grade air conditioning limit switch designed for critical pressure monitoring in HVACR systems. Built with a Single Pole Double Throw (SPDT) contact configuration, this controller provides versatile switching capabilities for high-pressure cutout or condenser fan cycling. It features an adjustable operating range of 7 Psi to 150 Psi, making it a standard field replacement for technicians servicing commercial packaged units, heat pumps, and small water chillers. The P20CA-75 is technically identical to the P20CA-75C, as the "C" suffix typically denotes individual commercial packaging for wholesale distribution rather than any variance in internal specifications. This unit utilizes a dust-tight snap-acting switch to prevent contact pollution and is compatible with all non-corrosive refrigerants. Its compact design and dual-purpose terminals (quick-connect or screw) simplify installation in tight electrical cabinets where space is at a premium.

• Universal Compatibility: Fully interchangeable with the P20CA-75C for streamlined inventory and field replacement.
• Rugged Reliability: Features an enclosed SPDT snap-acting switch that resists environmental contaminants and ensures precise repeatability.
• Field Adjustable: The 7-150 PSI range allows for fine-tuning setpoints to meet specific system requirements using standard tools.
• Flexible Installation: Equipped with dual-style terminals and 1/4 inch connections for rapid integration into existing control circuits.
• Broad Application: Suitable for use in HVAC high pressure limit protection, refrigeration equipment, and cooling tower fan cycles.

Is the P20CA-75 compatible with R-410A systems?
Yes, this control is designed for use with all non-corrosive refrigerants, provided the system operating pressures fall within the 7 to 150 Psi range. Always verify your high-side cut-out requirements before installation.

What is the difference between the P20CA-75 and the P20CA-75C?
There is no functional or technical difference between these two part numbers. The "C" suffix is a packaging indicator used by Johnson Controls for individual commercial units; the internal specifications and performance remain identical.

How do I wire the SPDT contact for high-pressure cutout?
For a safety cutout application, you typically use the terminals that open on pressure rise. The SPDT configuration allows you to simultaneously break the compressor circuit and close a dry contact for an external alarm or status light.

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.