The pump is equipped with a built-in electronic control unit which manages its operation (pump ON/FF) and prevents damage. The electronics protects the pump against dry running conditions. Priming cycle: when started, the pump will perform the following operation until it is primed: four priming trials of 30” (motor ON) with pauses of 3” (motor OFF). If there is no water, i.e. if the priming trials fail, the pump will stop for an hour before trying to prime again. If also this trial fails, there will be a 5-hour pause. Afterwards, if the lack of water persists, the pump will try to prime every 24 hours until it has picked up a prime. Normal Operation: If, during the pump operation, the water supply is lower than the minimum delivery for more than 40”, the pump will go into alarm mode, and stop for 1 hour. Afterwards, if the lack of water persists, the pump will try to prime. The electronic unit also protects the pump from damage that could be caused by the blocking of the Non Return Valve (NRV). Such blockings are generally due to dirt deposits, or sand, and they cause the pump to operate even if there is no water demand from the end-user. The protection function stops the pump automatically every hour; if no damage is detected the user notices only a very slight drop in pressure. If the VNR is blocked the pump goes into alarm mode and stops. In this case the pump can be restarted only after unplugging the pump and removing the obstruction of the VNR. The best working condition is with the pump completely submersed in water. Anyway the motor’s cooling system allows use at the minimum suction height (50 mm) for very short periods. We recommend you read the Divertron instruction manual (also available on our DNA software) for all information on the use of the product.