Johnson Controls P70AB-2 Pressure Control

The Johnson Controls P70AB-2 is a robust SPST low pressure control designed for heavy-duty commercial refrigeration and air conditioning applications. As a direct P70AB-43 replacement and P70AB-46 replacement, this unit provides precise low-side pressure monitoring and pump-down control. Featuring an adjustable range from 20" WC to 100 PSI and a flexible 6 to 50 PSI differential, it allows technicians to fine-tune system cut-in and cut-out points for optimal compressor protection. The internal Single Pole Single Throw (SPST) switch is configured to open on pressure drop, ensuring the system shuts down safely before reaching vacuum or critical low-pressure thresholds.

This refrigeration pressure switch is built for the field, featuring an all-steel case and cover to protect internal components from harsh mechanical environments. The 36-inch capillary tube with a 1/4" flare nut pressure connector provides versatility for remote mounting, while the cutout knob adjustment allows for rapid setpoint changes without removing the housing. Engineered for all-range refrigerant compatibility, including R-22, R-134A, R-404A, and R-504, it handles a 325 PSIG maximum overpressure, making it a staple for contractors maintaining large-scale HVACR equipment.

Key Benefits for Contractors

• Direct Replacement Logic: Serves as the primary P70AB-2 replacement for discontinued legacy models P70AB-43 and P70AB-46, reducing site-visit downtime.
• Broad Compatibility: "All Range" design supports R-12, R-22, R-134A, R-404A, R-500, and R-502 systems.
• Enhanced Durability: Rugged all-steel construction withstands vibration and industrial site wear better than plastic alternatives.
• Precise Tuning: The 6 to 50 PSI adjustable differential provides the granularity needed for sensitive commercial refrigeration cycles.
• Flexible Install: The 3-foot capillary allows for positioning the control in accessible areas even when the tap point is cramped.

Common Questions

What is the switch action for the P70AB-2?
This model features SPST Open-Low action (also known as Close High, Open Low), meaning the contacts open when the pressure drops to the cutout setpoint and close when the pressure rises to the cut-in point.

Can this be used for high-pressure cutout?
No, the Johnson Controls P70AB-2 is strictly a low pressure control. For high-pressure safety limits, a P70 series high-pressure control (e.g., P70CA) should be utilized.

What is the maximum electrical load for this switch?
The contact rating is 17 Amps at 240V (1-phase), making it suitable for direct control of most single-phase motors and pilot duty circuits in HVACR applications.

?? Prop 65 Warning: This product contains chemicals known to the State of California to cause cancer and reproductive harm. For more information, visit www.P65Warnings.ca.gov.

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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.