Before starting, it is essential to fill the system with water and to vent the air. Vent the residual air from the pump body via the venting tap until only water comes out. This is to ensure that the mechanical seal is well lubricated and that the pump starts running smoothly immediately. Power up and check the correct direction of rotation which, looking at the motor from the fan side, should be clockwise. The check should be carried out after the pump has been powered up by acting on the main switch with a fast start-stop sequence. If the direction of rotation is reversed, invert any two-phase leads, after having isolated the pump from the power mains. When the hydraulic circuit has been filled with liquid, gradually open the delivery gate valve to the maximum permissible opening. The energy consumption of the motor must be checked and compared with the value on the data plate, especially if the pump was intentionally equipped with a motor with reduced power (check the design specifications). With the electric pump in operation, check the supply voltage at the motor terminals, which must not differ by +/- 5% from the rated value.