8
The maximum head of the pump is of 15 metres of water column; greater hydraulic loads negatively influence
the functioning of the pump and limit the life-span of the diaphragm. For continuous uses, the total
manometric head must not exceed the 10 metres of water column.
The correct installation of the suction and delivery piping is assured by observing the flow direction recalled in
most versions using directional arrows on the suction and delivery nozzles or, however, verifying that suction is
on the nozzle with plug or air case.
In installing units with endothermic engine, ensure maximum inclination of the engine does not exceed the 35°
in transversal or longitudinal direction, in order to guarantee a correct lubrication value.
11.1 ELECTRIC CONNECTIONS
For versions with electric motor, the pump must be connected to an electric plant provided with earth system
according to local technical Standards in force.
For the single-phase version, keep to the current technical Standards.
Ensure the plate voltage corresponds to that of the power supply network.
Ensure the electric pump is disconnected from the electric power supply before carrying out any installation or
maintenance operation.
Do not use the power supply cable of the pump to lift it or transport it.
It is advised to install a differential switch with high sensitivity as additional protection against electric shocks in
case of insufficient earthing.
In the three-phase version, connect the earth wire (yellow-green) of the power supply cable to the earthing
system of the power supply network.
The installer has the responsibility of assuring that the earth system of the power supply network is in
accordance with Standards.
In the three-phase version, connect the pump to the feeder using a magneto thermal motor protector or a
contactor with thermal relay.
Every time the pump with a three-phase engine is connected to a different feeder, there are equal
opportunities it turns in one direction or the other.
The incorrect rotation direction causes a significant reduction of the flow rate and an incorrect functioning of
the reducer.
The correct rotation direction is that indicated with an arrow on the reducer body.
If the engine does not turn in the right direction, invert the two phases between them after having
disconnected the line.
12. BEFORE START-UP
Read the instructions and the safety standards of the engines coupled with the pump unit supplied and
rigorously comply with the dispositions of the manufacturer of the same engine.
With regard to the Libellula 2" pump unit, before start-up fill the carter of the reducer oil up to the notch of
the filling plug rod.
Consult the following table for the amount and brand of the oil to be used.
LIBELLULA 2"
REDUCER OIL QUANTITY (Viscosity ISO150) Lt 0,65
BRAND
TYPE
