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If the temperature of the pumped liquid represents a critical factor, install in the system a
thermometer, preferably on the suction line. These control instruments can advise of abnormal
operating conditions of pumps such as: accidentally closed valves, missing liquid, overloads etc.
2.8 Motor connection
Check that the voltage and frequency printed on the label of the motor correspond to those of the
electric system to be used. Don't connect the electric motor directly to the main system but protect
the dedicated system with a suitable main switch with adequate safety protections against overloads.
The electric connections have to always be carried out by an expert qualified electrician.
The motors have to be supplied with three-phase voltage, or if required by the customer, with single
phase voltage. The type of connection of the three-phase motors can be Star (Y) or Delta (Δ)
according to the power supply 380 or 220 VAC (see picture 1).
STAR (Y) DELTA (Δ)
Picture 1
Make sure that the direction of rotation of the motor is that as specified on the pump head and
eventually indicated by a sticker arrow on the motor fan. To change the sense of rotation it's
sufficient to change two of the three entering line (E.g. L1 with L2) in three-phase motors.
Read the following instructions to change the direction of rotation:
wear individual authorized protection equipment (e.g. gloves, glasses)
make sure that the operating conditions are similar to the specifications of the pump
install the pump in the hydraulic system.
open the suction and the discharge valve completely.
fill the pump with the liquid. It' s recommended to perform this test with an inert liquid like water.
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