Johnson Controls P70GA-2 Pressure Control

The Johnson Controls P70GA-2 Pressure Control is a versatile, heavy-duty solution for commercial refrigeration and air conditioning systems requiring precise low-pressure cut-out or pump-down control. Operating within a 20 to 100 psi range, this unit features a 4-wire, 2-circuit switch configuration with 1 normally open and 1 normally closed contact. This allows technicians to manage a primary load while simultaneously operating an auxiliary alarm or signal circuit. The open low action makes it an ideal fit for condenser fan cycling or protecting compressors against loss of charge.

Built with a rugged NEMA 1 enclosure and an all-steel case, the P70GA-2 is designed to withstand the demands of mechanical rooms. The 36-inch capillary provides flexible mounting options away from high-vibration areas, ensuring the longevity of the pressure actuated bellows. With its Sight-Set calibrated scale, contractors can perform quick visual inspections and adjust setpoints accurately without removing the cover. This automatic reset control is compatible with all non-corrosive refrigerants, making it a reliable standard for multi-circuit HVACR pressure monitoring.

• Dual-Circuit Versatility: The 4-wire system supports independent control of the compressor and a secondary alarm or indicator.
• Precise Range Control: Specifically engineered for the 20 to 100 psi spectrum to ensure accurate low-side system protection.
• Durable Construction: Features an all-steel case and cover to protect internal components in industrial environments.
• Simplified Installation: The 36-inch capillary tube allows for remote mounting, reducing the impact of compressor pulsation.
• High-Visibility Adjustments: Sight-Set technology allows for easy setpoint verification and field-side calibration.

What is the primary application for the P70GA-2?
This control is primarily used for low-pressure cut-out, pump-down control, and condenser fan cycling in commercial HVACR systems.

Can this unit be used as a high-pressure safety limit?
No, the P70GA-2 is designed for the low side with a maximum range of 100 psi. For high-side safety, a high-pressure control from the P70 series with a higher range and manual reset is required.

How do I wire the normally open and normally closed circuits?
The 4-wire block is designed so that one circuit opens on pressure fall (Open Low) while the other closes, allowing for a "trip" signal to be sent to an external monitoring system or alarm when the primary circuit cuts out.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.