Johnson Controls P70LB-1 Pressure Control

A veteran technician knows that a reliable **dual pressure control** is the backbone of compressor protection. The **Johnson Controls P70LB-1** is an industrial-grade **SPST pressure switch** designed to provide comprehensive high- and low-pressure monitoring in a single unit. This "All Range" control is fully compatible with non-corrosive refrigerants including **R-12, R-22, R-134A, R-500, and R-502**, making it a versatile choice for commercial refrigeration and air conditioning service. It features an adjustable low-pressure range of **20" Wc to 100 psi** with a 7 to 50 psi differential, alongside a high-pressure cutout range spanning **100 to 500 psi**.

The unit utilizes a **36" capillary with a 1/4" flare nut connection** for secure integration into the system. Engineered for durability, the P70LB-1 is the direct replacement for the **P70LA-24**, offering a high-pressure differential that scales for precision: 65 psi at less than 300 psig, 75 psi between 300-400 psig, and 95 psi when operating above 400 psig. The **Sight-Set calibrated pressure adjustment** allows for accurate setpoint verification at a glance, while the all-steel case ensures the internal bellows and **load-carrying contacts** remain protected in demanding mechanical rooms.

• Direct Replacement: Seamlessly replaces the legacy P70LA-24 dual pressure control.
• High Contact Rating: Features SPST switching capable of handling 17 F.L. Amps at 240V for direct compressor control.
• Multi-Refrigerant Support: Verified for use with R-22, R-404A, R-134A, and other common non-corrosive refrigerants.
• Rugged Enclosure: NEMA 1 galvanized steel case with a plated and painted cover for long-term corrosion resistance.
• Precision Tuning: Includes a cutout knob adjustment for field-calibrating high and low limits without removing the cover.

Is the P70LB-1 an automatic or manual reset control?
This model features automatic reset functionality for both the high- and low-pressure sides, ensuring the system resumes operation once pressures return to safe levels within the set differential.

Can this be used for ammonia applications?
No. The P70LB-1 is designed for non-corrosive refrigerants. For ammonia systems, a different P70 series model with stainless steel bellows and NPT connections must be used.

How do I adjust the high-pressure differential?
The high-pressure differential on this "All Range" model is fixed and non-adjustable, varying automatically based on your high-side pressure setting (65 to 95 psi).

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.