Johnson Controls P70CA-4 Pressure Control

The Johnson Controls P70CA-4 Pressure Control is a heavy-duty electromechanical switch engineered for high-demand commercial refrigeration and HVACR systems. Specifically designed for compatibility with ammonia refrigerants, this unit features a rugged 1/4" female NPT stainless steel pressure connector to resist corrosion in harsh environments. As a direct replacement for P70CA-64, it provides a reliable SPST switch action configured to close high and open low, making it an ideal choice for low-pressure cutout, pump-down control, or capacity control applications. With an adjustable range of 20" Wc to 100 Psi and a flexible 6 Psi to 50 Psi differential, technicians can fine-tune system setpoints with precision using the "Sight-Set" calibrated scale. The all-steel case and NEMA 1 enclosure provide superior internal component protection, while a 325 Psig maximum overpressure rating ensures durability during system pressure spikes.

• Ammonia Compatible: Constructed with stainless steel internals specifically for use in ammonia-based refrigeration systems.
• Precision Adjustment: Features a "Sight-Set" calibrated scale for accurate pressure setpoint viewing without removing the cover.
• High Durability: The all-steel case protects the SPST mechanism from mechanical damage and environmental wear.
• Versatile Range: Supports a wide operating envelope from 20" Wc to 100 Psi, suitable for diverse commercial applications.
• Drop-in Replacement: Engineered to replace the legacy P70CA-64 model with identical mounting and technical specs.

Common Questions

Is the P70CA-4 suitable for non-corrosive refrigerants?
While optimized with stainless steel for ammonia, this control is also compatible with non-corrosive refrigerants, air, water, and oil. However, always verify chemical compatibility for specific industrial fluids.

Can this unit be used for high-pressure cutout?
No, the P70CA-4 is a low-pressure control. For high-pressure limiting applications, a P70 series high-pressure cutout with the appropriate range and manual reset would be required.

How do I adjust the differential on this model?
The 6 to 50 Psi differential is adjusted via the internal screw. Use the "Sight-Set" window to align the pointer with your desired cutout and cut-in values for pump-down control.

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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.