P70AA-1C Johnson Controls Pressure Control

Overview

The Johnson Controls P70AA-1C is a Single Pole Single Throw (SPST) pressure control switch designed primarily for use in commercial refrigeration and air conditioning systems. This electromechanical control employs a set of switch contacts operated by the movement of pressure-actuated bellows to regulate high-side or low-side system pressure, provide compressor protection, or manage fan cycling. Built with an all-steel case and cover, it provides rugged protection for internal components and delivers reliable performance in demanding commercial and industrial environments.

Features

• All-Steel Case and Cover: Provides long-lasting, rugged protection for internal components.
• Sight-Set Calibrated Adjustment: Features a visible pressure scale for straightforward adjustments through the range without removing the cover.
• SPST Electrical Configuration: Single pole, single throw design providing direct control of AC motors within the control rating.
• Remote Sensing Design: Includes a capillary tube with a 1/4-inch flare nut connection for flexible installation options.
• Dependable Switch Action: Engineered with close high–open low contact operation for responsive system cycling.

Specifications

• Pressure Range: 20 inches WC to 100 PSI
• Pressure Connector: 1/4 in. Flare Nut
• Switch Action: Close High – Open Low
• Electrical Configuration: Single Pole Single Throw (SPST)
• Maximum Operating Pressure: 325 psig (2241 kPa)
• Motor Ratings: Supports standard pilot duty (125 VA at 120 to 600 VAC) and direct motor control based on standard full-load and locked-rotor amp limits.

Applications

• Commercial Refrigeration: Ideal for low-pressure cut-out control, pump-down control, and capacity management.
• Air Conditioning Systems: Used for high-pressure cut-out monitoring, head-pressure control, and compressor safety.
• Condenser Fan Cycling: Automates fan operation based on refrigerant pressure levels to maintain system efficiency.
• Non-Corrosive Fluids: Suitable for environmental control in various commercial refrigeration and HVACR systems utilizing common compatible refrigerants.