P70CA-4C Johnson Controls Pressure Control

Overview

The Johnson Controls P70CA-4C is a high-quality, electromechanical low-pressure control switch designed primarily for commercial refrigeration and air conditioning systems. Engineered specifically for ammonia service, it features an all-steel case and an automatic reset mechanism that opens on high pressure to regulate or protect equipment from critical pressure conditions.

Features

• Designed for compatibility with ammonia service (NH3 applications).
• All-steel case and cover provide rugged protection for internal components.
• Sight-Set calibrated pressure adjustment offers a visible pressure scale for adjustments without removing the cover.
• Single-Pole Single-Throw (SPST) switch action that opens on high pressure.
• Bellows-actuated sensing element ensures high reliability and accurate operation.

Specifications

• Pressure Range: 20 inches Hg to 100 PSI
• Adjustable Differential: 6 to 50 PSI (or 7 to 50 PSI depending on system calibration)
• Connection Size: 1/4 inch Female NPT (Stainless Steel internal thread)
• Electrical Rating: 120/240 VAC, 17 Amps at 240 V (Full Load)
• Maximum Over Pressure: 325 PSIG
• Enclosure Type: NEMA 1

Applications

• High-side pressure monitoring and low-pressure cutout control.
• Pump-down control and capacity control strategies.
• Commercial refrigeration and HVAC systems utilizing ammonia as a refrigerant.