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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.
Thread: A 3-wire fan / defrost termination switch? A 3-wire fan / defrost termination switch? Red wire, brown wire, black wire. On a 120 volt system one wire has to be a common connection, one wire has to be the common to the X terminal on the defrost timer, and the other wire has to control the common to the evap fans.