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Deadband is also known as hysteresis and is the amount of a measured variable (pressure, temperature, etc.) between the point where a switch closes and then re-opens. It can be implemented is software if you have an analog input (i.e., open at 1.02 PSI, close at 0.98 PSI) or designed into a switching mechanism. Often the deadband of a switch is fixed and cannot be adjusted. A typical example is in a wall thermostat in your house.
Allows compressor to resume when pressure drops below reset point. Mounted on or near receiver dryer.  Fan Trigger Switch: Turns on engine cooling fan to lower system pressure when set point pressure is reached, either directly or bysignaling Engine Control Module. Mounted on high pressure side of compressor.  Low Pressure Cutout Switch: Prevents system damage due to low pressure or low refrigerant charge by disabling A/C compressorwhen pressure drops below reset point. Allows compressor to resume when pressure rises above set point. Mounted on low pressureside of compressor.