Operation Manual

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6. Start-up
information for installers
6.1 Water Connection
The water connections must be made by qualified installation technicians in compliance with the regulations in force.
In case of connection to the water system, the regulations issued by the competent authorities (municipal, public utility company)
must be observed.
Authorities often require the installation of a backflow prevention device, such as a disconnector or check valve or disconnection
tank.
The suction pipe must be perfectly sealed and watertight. If the pump/electric pump is installed near dwellings, suitable pipes or flexible unions should be
provided to prevent the transmission of vibrations from the pump to the pipes. Install on-off valves on the suction and delivery sides to avoid having to
drain the system before maintenance, repair or pump replacement operations can be performed. Whenever necessary,
provide a by-pass circuit to prevent the overheating of the water inside the pump.
Refer to the illustrations in section 3.1.3
6.2 Electrical Connection
The electrical connections must be performed by a qualified installation technician in compliance with the regulations in force.
WARNING
Make sure that the supply voltages and frequencies are suited to the characteristics of the electric motor. Check the motor rating
plate. Provide suitable general protection against short circuits on the power line.
Before proceeding, make sure that all the connections (even those that are potential-free) are voltage-free.
The power supply line must be provided with the following devices (unless otherwise specified by the local regulations in force:
• Ashort-circuit protection device
• Ahigh-sensitivity differential device (30mA) providing additional protection against electric shock in case the grounding system
is inefficient.
• Amains isolator switch with a contact gap of at least 3 millimeters.
Ground the system according to the regulations in force. First of all, connect the external protection conductor to the PE terminal,
making sure that it is longer than the phase conductors. The selection of the conductors (gauge, material, sheath material,…)
must take into account the actual operating conditions. Protect the electrical conductors from too high temperatures, vibrations
and collisions.
6.2.1 Overload protection
WARNING
You must provide the overload protection (thermal relay or motor protector)
Adjust the thermal relay or motor protector to the nominal current value of the electric pump or to the operating current in case the motor is not used at
full load. If the motor has a star-delta starting system, adjust the thermal relay to a value equal to 58% of the nominal current or operating current.
6.2.2 Protection Against Dry Running
WARNING
Avoid the possibility of dry running, i.e. the pump must not run without water inside it. Make sure that the electric panel is
equipped with a dry running protection system to which you must connect a pressure switch or float switch or sensors or other
suitable device
If the pump sucks the water from a water system, you can install a pressure switch on the suction side to switch off the pump in the event of low water
system pressure (always refer to the regulations locally in force). If the pump sucks the water from a storage tank or reservoir, you can install a float
switch or sensors to switch off the pump in the event of low water level.
6.3 Priming
WARNING
Fill the pump and suction pipes with water before starting the unit. Dry running can damage the pump.
6.3.1 Suction from a higher level than the pump level or from the aqueduct
Loosen the drain plug pin to end of travel without forcing it. Remove the fill plug/air valve and open the on-off valve upstream until the water flows out of
the fill plug/air valve. Tighten the drain plug pin to the end of travel without forcing it. Replace the fill plug/air valve.
6.3.2 Suction From a Lower Level (Suction Lift)
Open the on-off valve located upstream from the pump and close the on-off valve downstream.
Loosen the drain plug pin to end of travel without forcing it. Remove the fill plug/air valve and fill the pump using the elbow bell fitting supplied with the
pump. Replace the fill plug/air valve and tighten the drain plug pin to the end of travel without forcing it.
6.4 Checking the Rotation Direction of Three-Phase Motors
When the pump has been electrically connected and primed , make sure the on-off valve downstream from the pump is closed. Start the pump and
check the direction of rotation through the coupling protection or through the motor fan cover (for the three-phase versions). The correct rotation direction
is indicated by arrows on the adaptor, coupling and/or motor fan cover. If the rotation direction is incorrect, stop the pump, disconnect the power supply
and exchange the position of two wires in the motor’s terminal board or in the electric control panel.
6.5 Operation
Start the pump, keeping the on-off valve downstream from the pump closed. Open the on-off valve gradually. The pump must run smoothly and
noiselessly. If necessary, re-prime the pump. Check the current absorbed by the motor and, if necessary, adjust the setting of the thermal relay.
WARNING
If a pump installed in a location where freezing may occur remains inactive, you must drain it through the drain plugs. This
operation is not necessary if a suitable antifreeze has been added to the water.
Make sure that the drained liquid does not cause damage or injuries.
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