Johnson Controls P70CA-61 Pressure Control

The Johnson Controls P70CA-61 is a commercial-grade ammonia pressure control designed for heavy-duty industrial refrigeration and HVACR systems. This single pole pressure control features a single-pole, single-throw (SPST) switch configuration with an open high action, typically utilized for capacity control or high-pressure cutout in ammonia-based applications. Engineered for precision, the P70CA-61 operates within a 20 psi to 100 psi range, providing reliable operating control for AC motors within its electrical rating. This model is technically identical to the P70CA-61C, ensuring direct compatibility for field replacements where a rugged, NEMA 1 steel enclosure is required.

For veteran contractors managing ammonia plants, the P70CA-61 offers the necessary corrosion resistance for harsh environments. The Sight-Set calibrated pressure adjustment allows for visible setpoint monitoring and adjustments through the range without 100% disassembly of the housing. When installing, ensure the control is mounted upright to facilitate proper drainage from the bellows. This industrial refrigeration pressure switch is a critical component for maintaining system stability and protecting compressors from high-side pressure spikes.

Key Benefits

• Ammonia Compatibility: Specifically constructed with materials resistant to ammonia corrosion, critical for industrial cold storage and food processing.
• SPST Open High Action: Optimized for high-pressure cutout or capacity control, opening the circuit on pressure rise to protect system integrity.
• Broad Operating Range: Adjustable from 20 psi to 100 psi, offering flexibility for various low-pressure side or capacity-specific setpoints.
• Rugged Construction: Features an all-steel case and cover to withstand high-vibration environments common in mechanical rooms.
• Simplified Maintenance: The P70CA-61 pressure control includes a visible scale for rapid setpoint verification during routine service calls.

Common Questions

Is the P70CA-61 interchangeable with the P70CA-61C?
Yes, the P70CA-61 and P70CA-61C are technically identical in specifications, mounting, and performance, allowing for seamless integration into existing ammonia systems.

What is the primary application for an Open High switch in ammonia service?
Technicians typically use this P70 series control for capacity control or as a high-limit safety that cuts power to the compressor or unloader when head pressure exceeds the 100 psi threshold.

Can I mount this control inside a shared electrical cabinet?
No. For safety and code compliance in ammonia applications, the control must be mounted separately from the main electrical cabinet to prevent potential migration of ammonia into sensitive electrical components.

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.