Johnson Controls P20BB-1 Pressure Control

The Johnson Controls P20BB-1, also identified as the P20BB-1C, is a specialized HVAC pressure control designed for precise low-pressure cut-out protection. Engineered for use with all non-corrosive refrigerants, this SPST pressure switch operates within an adjustable range of 7 PSI to 150 PSI. Its open low configuration ensures the circuit breaks immediately upon a pressure drop, necessitating a manual reset to restore equipment operation. This safety feature is critical for technical site management, as the trip-free manual reset prevents automatic restarting until a technician has addressed the underlying system fault. The slim profile and 36-inch capillary tube with 1/4-inch sweat connection allow for flexible installation in space-restricted commercial refrigeration or residential air conditioning units. As a veteran-grade refrigerant limit switch, it provides high repeatability and rugged reliability for compressor protection in demanding field environments.

Key Benefits

• Broad Compatibility: Seamlessly replaces Ranco G20-4412 and Robertshaw 3126-216 models.
• Enhanced Safety: The trip-free manual reset mechanism ensures the unit cannot be overriden or bypassed during a fault condition.
• Durable Construction: Features a dust-tight contact unit and a copper capillary to withstand rigorous mechanical vibration.
• Precise Regulation: Delivers accurate repeatability across the 7 to 150 psig operating spectrum for consistent system monitoring.

Common Questions

Is the P20BB-1 interchangeable with the P20BB-1C?
Yes, the P20BB-1 and P20BB-1C are technically identical. The "C" suffix typically denotes a universal replacement model packaged for individual sale, maintaining the same 7-150 PSI range and manual reset functionality.

How do I adjust the setpoint on this pressure control?
The setpoint is screwdriver adjustable. Technicians can calibrate the cut-out point by turning the adjustment screw to the desired PSI on the internal scale before completing the 1/4" sweat connection.

Can this switch be used with R-410A refrigerants?
While designed for non-corrosive refrigerants, ensure the system's operating pressures do not exceed the 250 PSI maximum bellows pressure rating of the P20BB series.

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.