Common Questions for Technicians:

Evaporator Protection: Acts as a primary safety switch to shut off the defrost heater

Always check for corrosion on the module pins before seating the wiring harness and ensure the locking tabs click into place to prevent signal loss

Will this part solve a furnace that keeps shutting off

Johnson Controls P20BB-1 Pressure Control Els PW 17895 Common Questions for Technicians: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