Johnson Controls P70MA-2 Single Pole Dual Pressure Control, SPST

Description

Johnson Controls P70MA-2 Single Pole Dual Pressure Control Overview

The Johnson Controls P70MA-2 is a professional-grade single pole dual pressure control engineered for reliable refrigeration and HVAC system protection. Featuring SPST (Single Pole Single Throw) switching action, this control monitors both low-side and high-side pressures simultaneously, providing comprehensive circuit protection in a single device. The manual reset lockout function ensures that any pressure fault requires deliberate technician intervention before the system is allowed to restart — preventing repeated compressor cycling and potential equipment damage.

Key Features

• SPST (Single Pole Single Throw) switching configuration
• Dual pressure control monitors both low and high side in one unit
• Low pressure range: 20″ WC to 100 PSI
• Low pressure differential range: 7 PSI to 50 PSI
• High pressure range: 100 PSI to 500 PSI
• High-side lockout differential requires manual reset — prevents automatic restart after high-pressure fault
• 1/4″ Female NPT pressure connections for easy field installation
• Compact, single-housing design reduces installation complexity

Pressure Specifications

• Low Pressure Cut-Out Range: 20″ WC to 100 PSI
• Low Pressure Differential Range: 7 PSI to 50 PSI
• High Pressure Cut-Out Range: 100 PSI to 500 PSI
• High Pressure Differential: Lockout type — requires manual reset
• Port Connection: 1/4″ Female NPT

Applications

• Commercial and light industrial refrigeration systems
• Air conditioning and heat pump compressor protection
• Systems requiring both low- and high-pressure safety cutout in a single control
• Applications where manual reset lockout is required for high-pressure faults

Why Choose the Johnson Controls P70MA-2?

The P70MA-2 combines the functionality of two separate pressure controls into one rugged unit, simplifying wiring and reducing panel space. The wide low-pressure adjustment range — from deep vacuum (20″ WC) all the way to 100 PSI — makes it versatile across multiple refrigerant types. The high-pressure lockout with manual reset adds an important layer of compressor protection, ensuring that technicians must evaluate the cause of a high-pressure trip before the system is returned to service. The 1/4″ FNPT connections are industry-standard, making installation straightforward on virtually any refrigeration or HVAC system.