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5.3 HYDRAULIC CONNECTIONS
The installation of the units described in this manual must be carried out by qualified staff that has read and understood the
content of this manual and the eventual attached documentation.
In carrying out the hydraulic connections verify that:
• the sections of the intake and flow piping are equal or greater than those of the collectors or stub pipe or, however,
such to avoid a too high speed of the flow (it is preferable to remain below 2 m/sec).
• the intake and flow piping is perfectly aligned with the collectors of the inserted unit
• the intake piping has the lowest possible number of bends and section variations and is as short as possible
ATTENTION
We recommend overlapping anti-vibrating elastic joints to eliminate any misalignment and to reduce the propagation of the
vibrations.
ATTENTION
We recommend installing a float switch (the electric board is already prepared for the connection) to prevent dry running.
ATTENTION
In case of water withdrawal from well or, however, above water level, we recommend mounting a bottom valve with filter on
to the intake piping.
In case of withdrawal from reservoir or collection tank, this must be dimensioned according to the maximum water request
point and to the supply possibility of the water system.
5.4 ELECTRICAL CONNECTIONS
The electric connections must be carried out by qualified staff, following the electric layouts and applying the
state-of-the-art rules.
Verify that the electric power supply system is provided with an efficient earthing system. The yellow-green
earth conductors must be connected to the electric boards before the other conductors whereas, during the
disconnection phase, they must be the last to be removed.
ATTENTION
Verify the correspondence between voltage and frequency of the electric power supply network and the plate data of the
motor-driven pumps.
6. START-UP, RUNNING, CHECKS
6.1 START-UP
Before starting the unit, verify that the motor shafts of the motor-driven pumps rotate freely as described in the start-up and
operation paragraph of the pump
In case of three-phase motor-driven pumps, verify that the rotation direction corresponds to that indicated by the arrows
placed on the pump bodies or on the fan covers; on the contrary, invert the connections of two phases of the electric power
supply cable.
Perform the full priming of the pumps by carrying out the following operations:
1. Loosen the cap on the intake collector.
2. Open all collectors motor-driven pumps connection valves.
3. Completely fill with water.
4. Close the cap.
5. Open the motor-driven pumps priming caps and carry out similar operation.
manual.
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