This is control unit with two main function. The first one is to keep constant water level in a tank, the second one is to detect and stop the pump when the well is out of water.
Water level in the tank is detected by a floater, out of water state is detected by a through-flow switch.
When low water in the tank is detected, the control unit turns on the pump until the level is OK. If the well is out of water, the control unit turns off the pump and waits for some time (in terms of minutes) and then tries to turn the pump on again.
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