"Cooling Fan" no speed control function type Control Panel Operation: level control function (assumed: D for the high-water point, A point is the water level, B point of the low water level, C point of water). 1, "Cooling Fan" on initial power-up, if the water level at the point C, dry fault display automatically open the water inlet valve until the water level rises to point A, dry light is off, the water level reaches D accounted for only stop the water . If the water level between the point C and point D, the pump can be started without displaying display low water shortage is not a fault, the inlet valve opens automatically when the water, the water level reaches the point D to stop the water. 2, the process of "Cooling Fan" operation, when the water level at the point C, dry long bright light, the water pump does not work, when the water level rises to point A, the pump began to work, water lights off, when the water level rises to when the point D, the inlet valve to stop working, when the water level drops to point B, the intake valve opens, automatic replenishment D to stop.