Johnson Controls P20GB-1 SPDT High Pressure Control 100-425 PSI, Monitor/Respond

The Johnson Controls P20GB-1 is a high-pressure control switching in HVAC equipment. It controls the pressure of a system, air conditioning, or hydronic heating systems, when the pressure hits a certain level. This SPDT switch design means it can make a circuit in one of two ways, or paths. This has a working pressure range of 100 – 425 psi and has a manually reset button. When the pressure goes high at the set point, the switch breaks the circuit, thus stopping the power and the equipment. Once the pressure is below the setpoint, one can manually reset the switch to turn on the equipment.