DAB 1-2-3 NKP-G 32 Serie Instrucciones Para La Instalación Y El Mantenimiento página 22

3.3. Make the intake section following all the precautions necessary to keep load losses to a minimum and to avoid the
formation of air pockets, for example:
a) Position the set as close as possible to the power supply source.
b) Consider a suction pipe diameter never smaller than that of the manifold.
c) Lay the suction pipe horizontally or sloping slightly upwards towards the set. (fig.3).
d) Avoid using elbows or couplings that cause sudden changes in direction. If necessary, use bends with a wide radius.
e)
Avoid the "siphon" effect at intake: it risks unpriming the pumps!
3.4. Ensure that the characteristics of the water supply source are in proportion to those of the set installed.
a) SUCTION FROM A WELL ( PUMP ABOVE HEAD ): It is advisable to use a level gauge to be connected to the
electric panel of the set to avoid operation of the set in abnormal conditions.
b) SUCTION FROM A TANK ( PUMP BELOW HEAD OR ABOVE HEAD ): It is advisable to protect the pump
against dry operation, for example using a float switch to be connected to the electric panel of the set.
c) DIRECT CONNECTION TO THE MAINS: Should the pressure fall to excessively low values, it is advisable to
install a minimum pressure switch on intake, to be connected to the electric panel of the set.
Dry operation damages the electropumps.
4. ELECTRICAL CONNECTION
CAUTION! ALWAYS FOLLOW THE SAFETY REGULATIONS!
4.1. The electrical installation must be carried out by a qualified, skilled electrician (see point
2.1.) in compliance with the Safety Regulations in force in the country where the product
is installed.
4.2. Check the power supply voltage and frequency (fig.4).
Values differing from those on the motor plate could cause irremediable damage.
Connect the leads of the power supply cable to the terminal board on the control panel, giving priority to
4.3.
the earth lead.
For the wiring diagram of the control panel and the respective informative notes, see the enclosed documentation.
5. STARTING
To start the set correctly, perform the procedure below following the sequence indicated:
5.1.
Perform the following operation without switching on the power to the panel.
Check that the moving parts turn freely. To do this, remove the fan cover and, if necessary, the fan; then turn the shaft
with a suitable tool (screw driver, offset adjustable spanner, etc.). (fig. 5)
If it is blocked, tap lightly with a hammer on the end of the tool, then try to turn the shaft again.
5.2.
Perform the following operation without switching on the power to the panel.
Prime the set as follows:
a) Slowly pour in clean water through a sleeve of the suction manifold, keeping another sleeve open to allow the air inside
to get out, until the manifold is filled. (fig. 6/I).
Slowly pour clean water through a coupling of the delivery manifold (for example the coupling for connection to
b)
the expansion tank), until water comes out of the filling cap, previously removed. (fig.6/II)
5.3.
Perform the following operation without switching on the power to the panel.
Fit the expansion tanks on the special couplings of the delivery manifold.
It is possible to increase the storage capacity by connecting to the other tanks "T" couplings which have been
previously fitted between the connecting coupling of the expansion tank and the tank itself.
5.4. Switch on the power to the panel by turning the main motive power switch to position "1".
When the green warning light comes on it indicates that the panel is live.
ENGLISH
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