Tabla de contenido
Idiomas disponibles
Idiomas disponibles
en - Original instructions
3.
Open the on-off valve on the suction side
sufficiently to ensure the smooth flow of liquid out
of valve H.
4.
Close the valve H.
5.
Open both the on-off valves slowly and fully.
5.1.2
Suction lift installation
1.
Close the on-off valve on the delivery side, see
Fig. 18
2.
Open the on-off valve on the suction side.
3.
Loosen the relief valve H, see Fig. 11.
WARNING:
Be aware of the direction of the vent hole
and make sure that the liquid coming out
cannot cause damage or injury
In the case of liquids that are excessively
hot or cold, pay particular attention the risk
of injury.
4.
Unfasten cap G1.
5.
Fill the pump unit until the liquid comes out of the
hole.
6.
Wait 5 minutes and top up with more liquid if
necessary.
7.
Re-fasten cap G1.
8.
Close the valve H.
5.2
Checking the direction of rotation
(three-phase motors)
1.
Check that the pump unit has been installed and
filled properly.
2.
Check that the pump unit is connected to the
mains power supply.
3.
Check that the shaft can turn smoothly.
4.
Locate the arrows on the adapter, joint or cover to
determine the correct direction of rotation of the
motor.
5.
In rapid succession:
a)
Start the pump unit
b)
Check the direction of rotation through the
coupling guard or through the motor fan
cover
c)
Stop the pump unit.
5.2.1
Wrong rotation direction
1.
Disconnect the power supply.
2.
Invert two of the three wires of the power cable in
the terminal board of the motor or in the control
panel, see Fig. 12.
3.
Connect the power supply.
4.
In rapid succession:
a)
Start the pump unit
b)
Check the direction of rotation through the
coupling guard or through the motor fan
cover
c)
Stop the pump unit.
22
5.3
Start-up
NOTICE:
It is strictly prohibited to operate the pump
unit with the delivery on-off valve closed or
at zero flow rate: this can cause the liquid
to overheat and damage the pump unit.
If there is a risk of the pump unit running at
zero flow rate, install a bypass circuit to
guarantee a minimum flow rate; refer to the
technical catalogue for the minimum flow
rate values.
1.
Check that all the operations in the sections on
Filling - Priming and Checking the direction of
rotation have been carried out properly.
2.
Almost fully close the on-off valve on the delivery
side, see Fig. 17 or 18.
3.
Fully open the on-off valve on the suction side.
4.
Start the pump unit
5.
Gradually open the on-off valve on the delivery
side until it is half open.
6.
Loosen the relief valve H and keep it open until
the liquid flows out smoothly, see Fig. 11.
7.
Close the valve H.
8.
Gradually open the on-off valve on the delivery
side until it is completely open.
Note for models LNTE and LNTS: repeat this
procedure for both pump units.
After the start-up procedure, check that:
No liquid is leaking from the pump unit or pipes
The maximum pressure delivered by the pump unit,
determined by the available suction pressure, must
not exceed the nominal pressure
The current absorbed is within the rated limits (and
therefore calibrate the thermal overload protection
of the motor)
There is no unwanted noise or vibrations
The flap valve works properly (models LNTE and LNTS)
At zero flow rate, the delivery pressure corresponds
to the nominal pressure
WARNING:
If the pump unit is used to pump water for
human and/or animal consumption, run it for
a few minutes with several users open in
order to wash the inside of the system.
Settling of the mechanical seal
The pumped liquid lubricates the contact surfaces of
the mechanical seal; under normal conditions, a small
amount of liquid may leak out.
When the pump unit is run for the first time or
immediately after the seal is replaced, more liquid may
leak out temporarily.
To help the seal settle and to reduce leaking, close
and open the on-off valve on the delivery line two or
three times with the pump unit running.
5.4
Stopping
1.
Shut the on-off valve located on the delivery line.
2.
Stop the pump unit and check that the motor
slows down gradually.
Tabla de contenido
