P70CA-3C Johnson Controls Pressure Control

Overview

The Johnson Controls P70CA-3C is a high-performance electromechanical pressure control designed primarily for high-pressure cutout control, head-pressure control, and condenser fan cycling in commercial refrigeration and air conditioning systems. This automatic reset control features a Single-Pole Single-Throw (SPST) open-high switch action engineered to monitor system pressure and safely interrupt the electrical circuit if the pressure rises above a predefined limit, protecting unmonitored equipment from critical pressure spikes.

Features

• All-Steel Construction: Features a durable all-steel case and cover built to provide long-lasting, rugged protection for internal electrical and mechanical components.
• Sight-Set Calibrated Adjustment: Incorporates a visible pressure scale that allows for simple, fully adjustable pressure settings across the entire range without requiring the removal of the enclosure cover.
• Long-Life Contact Structure: Engineered with robust, bounce-free switch contacts that deliver direct, reliable control of motors within its designated electrical rating.
• Refrigerant Compatibility: Designed for versatile operations and is fully compatible with most common non-corrosive refrigerants.

Specifications

• Pressure Range: 50 to 500 psi (345 to 3,448 kPa)
• Factory Settings: Operates on a standard 50/450 psig high-pressure configuration.
• Differential Pressure: Adjustable from a minimum of 60 psi (414 kPa) to a maximum of 150 psi (1,034 kPa).
• Maximum Working Pressure: Rated up to 525 psig (3,620 kPa).
• Switch Action: Single-Pole Single-Throw (SPST) Open High.
• Pressure Connection: Equipped with a 36-inch capillary tube featuring a 1/4-inch flare nut connection.
• Enclosure Type: Standard NEMA 1 steel enclosure.

Applications

• High-Pressure Cutout: Used as a safety limit control to shut down compressors or system operations when discharge pressures exceed safe operating parameters.
• Head-Pressure Control: Manages optimal operating pressures within commercial cooling systems.
• Condenser Fan Cycling: Regulates condenser fan operation to maintain proper head pressure in commercial refrigeration and air conditioning applications.