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Protection against dry operation of the motor pumps
On the switchboard it is possible to connect to a device for tank level control:
Our units are delivered with 5 - 7 jump terminals.
WARNING
1 ) Float switch
The float must be installed in the tank and connected thanks to two wires to the special terminals on the
control board.
2 ) Electronic control with probes
The three probes should be specially placed in the first collection deposit and should be then connected to
terminals inside the board. The COMMON probe must be installed at the lowest level in the tank and anyway
always at a level lower than the minimum level probe (LOW) that prevents from the working of the pilot pump
when water descends below this level. The maximum level probe (HIGH) allows again the working of the pilot
pump when the water reaches this level.
3) Inverted minimal pressure sensor
In the case where the group is fed by a water duct under pressure (for example municipal water system), it is
necessary to install a minimal pressure sensor which prevents from the working of the group if the pressure
in the duct descends below the preset value.
24
LEVEL CONTROL CONNECTIONS
NO CONTROL
ELECTRIC PROBE
FLOAT
5
6
7
5
6
7
AL
TA
In this case the unit is not protected against dry operation. It is
therefore necessary to remove the electric bridges and connect
them to the control device selected.
:
MINIMUM
MANOSTAT
5
6
7
5
6
7
BA
CO
SS
M
A
UN
E
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