Johnson Controls P70SA-1 Pressure Control

The Johnson Controls P70SA-1 is a professional-grade Dual Pressure Control designed for heavy-duty commercial refrigeration and air conditioning systems. This robust unit utilizes two independent SPDT switches to monitor both the high and low sides of your refrigerant circuit, providing comprehensive compressor protection in a single NEMA 1 enclosure. The low-side range spans from 12 in. Hg to 80 psi with a 5 to 50 psi adjustable differential, while the high-side range operates between 100 psi and 425 psi with a fixed 65 psi differential. Featuring a convertible high-side reset, technicians can easily switch between automatic reset and manual lockout in the field to match specific system safety requirements. This mechanical pressure switch includes a 36-inch capillary and a 1/4 inch SAE flare nut for a secure and flexible refrigeration pressure control installation. Built without an adjustment knob to prevent unauthorized tampering, the P70SA-1 ensures your setpoints remain stable and your equipment stays protected under demanding operating conditions.

• Enhanced Equipment Safety: Modern HVAC dual pressure switch logic provides simultaneous high-pressure cutout and low-pressure cycle control, preventing compressor damage from loss of charge or overpressure.
• Field Versatility: The convertible reset mechanism allows for either automatic reset or manual lockout on the high side, reducing the need to stock multiple specialized parts.
• Rugged Construction: Encased in an all-steel case and cover, this Penn pressure control is built to withstand the vibrating environments found in commercial mechanical rooms.
• Precise Troubleshooting: Features Sight-Set calibrated scales that are visible through the enclosure, allowing technicians to verify setpoints quickly without opening the device.

How do I wire the P70SA-1 for an external alarm?
Because this unit features SPDT switches, you can use the normally closed (NC) contacts for the compressor circuit and the normally open (NO) contacts to trigger a remote alarm or indicator light when a high-pressure lockout occurs.

Can this control be used with non-corrosive refrigerants?
Yes, the Johnson Controls P70SA-1 is compatible with most common non-corrosive refrigerants. For ammonia applications, a specific ammonia-compatible model must be utilized.

What is the benefit of the manual reset lockout?
The manual reset ensures that the system cannot restart after a critical high-pressure event until a technician investigates and clears the cause of the failure, providing an essential safety layer for unmonitored equipment.

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.