Johnson Controls P70AA-5 Pressure Control

The Johnson Controls P70AA-5 is a professional-grade single pole low pressure control engineered for precision monitoring in ammonia refrigeration systems. This SPST pressure switch features an open-low switch action, making it essential for low-pressure cut-out, pump-down control, and capacity management. Built with a rugged all-steel case and cover, it protects internal components in demanding industrial environments while providing a "Sight-Set" calibrated scale for visible adjustments without removing the enclosure. The unit supports a diverse pressure range from 20" Hg to 100 psi and an adjustable differential of 7 to 50 psi, allowing technicians to fine-tune system setpoints for maximum compressor protection. With a 325 psig maximum overpressure rating and a 1/4" female NPT stainless steel connector, this Penn pressure control ensures reliable performance and compatibility with corrosive media like ammonia.

Key Benefits

• Ammonia Compatible Construction: Features a stainless steel pressure connector and bellows designed specifically for ammonia-based refrigeration applications.
• Precision Calibration: Integrated Sight-Set scales allow for accurate cut-in and differential adjustments while the NEMA 1 enclosure remains intact.
• Industrial Durability: The heavy-duty steel housing provides superior protection against vibration and physical impact common in mechanical rooms.
• Flexible Low-Side Control: Wide adjustable range supports various tasks from low-pressure cut-out to specialized pump-down cycles.

Common Questions

How do I adjust the cut-in and differential on the P70AA-5?
Use the range screw to set the high event (cut-in) point displayed on the right side of the scale. The differential screw adjusts the low event (cut-out) by changing the pressure spread between the two points.

Is the P70AA-5 suitable for high-side pressure limiting?
No, this model is designed for low-side pressure control. For high-pressure cut-out applications, a dedicated P70 high pressure control with open-high switch action should be used.

Can this control be used with non-corrosive refrigerants?
While optimized for ammonia, the stainless steel internals are also compatible with air, water, and non-corrosive fluids where a 1/4" NPT connection is preferred.

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.