Johnson Controls P70LB-25 Pressure Control

The Johnson Controls P70LB-25 is a professional-grade Dual Pressure Control designed for precise compressor regulation in commercial refrigeration and HVACR systems. Built with a Single-Pole Single-Throw (SPST) switch, this unit provides integral protection by responding directly to high and low-side pressure fluctuations. The Low Side operates within a 20 to 50 PSI range, while the High Side is rated for 100 to 425 PSI, ensuring the system stays within safe operating parameters. Featuring an Automatic Reset mechanism, this control is housed in a rugged NEMA 1 Enclosure and includes a 36-inch capillary tube for flexible installation and a 1/4" flare nut connection. The inclusion of an integrated adjustment knob allows for rapid field calibration without specialized tools, making it a reliable standard for technicians managing commercial refrigeration controls.

• Universal Compatibility: Optimized for use with most non-corrosive refrigerants across diverse HVACR applications.
• Manual Field Calibration: Features a sight-set calibrated scale and adjustment knob for high-accuracy setpoint tuning.
• Heavy-Duty Construction: The all-steel NEMA 1 enclosure protects internal silver contacts and bellows from job site debris.
• Automatic Operational Recovery: Ensures the system returns to service immediately once pressure setpoints stabilize.

What is the maximum overpressure rating for this control?
The P70 series is engineered to withstand high-side overpressure up to 475 PSI for the bellows assembly, though users should always calibrate within the 100-425 PSI range.

Can this control be used for condenser fan cycling?
While primarily used as a dual pressure cutout, the SPST switch configuration is suitable for cycling applications provided the electrical load does not exceed the contact rating.

Is this unit compatible with ammonia?
No, the P70LB-25 uses copper and brass bellows. For ammonia refrigeration systems, a stainless steel model must be specified to prevent corrosion.

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.