P70GA-11C Johnson Controls Pressure Control

Overview

The Johnson Controls P70GA-11C is an ammonia-compatible low pressure control switch designed primarily for commercial refrigeration and air conditioning applications. It functions as a low pressure cut-out, pump-down, or capacity control by sensing pressure conditions in ammonia or other non-corrosive fluid systems. This specialized electromechanical control features a four-wire, two-circuit switch configuration that enables the simultaneous operation of a system motor and external alarm devices.

Features

• All-steel case and cover built to provide long-lasting, rugged protection for internal components.
• Sight-set calibrated pressure adjustment displaying a visible scale for straightforward tuning without cover removal.
• Four-wire, two-circuit switch action (1 N.O., 1 N.C.) that opens M2 to line and closes M1 to line on low pressure events.
• Manual reset lockout mechanism to ensure trip-free low pressure safety that cannot be overridden until conditions normalize.

Specifications

• Model: P70GA-11C
• Pressure Range: 20 in. Hg Vacuum to 100 PSIG (-68 to 690 kPa)
• Differential Range: 7 to 50 PSI (48 to 345 kPa) Adjustable
• Switch Action: 4-wire, 2-circuit (Open Low: Line M1 Closes Low, Line M2 Opens Low)
• Pressure Connection: 1/4 inch Stainless Steel Female NPT
• Maximum Working Pressure: 100 PSIG (690 kPa)
• Maximum Overpressure: 325 PSIG (2,239 kPa)
• Contact Action: Manual Reset Lockout

Applications

• Commercial refrigeration and air conditioning systems.
• Low pressure cut-out control, pump-down control, and capacity control strategies.
• Ammonia-based systems and other non-corrosive fluid or gaseous applications requiring precise low pressure monitoring.
• Control circuits integrated with auxiliary alarm devices for safety warning signaling.