Pressure Boosting Function; Expansion Vessel; Electrical Connections Of Pump And Supply; Connection Of Additional Protections: High Pressure, Low Pressure And Motor Thermal Protection - DAB E.Box Plus Instrucciones De Instalación Y Mantenimiento

5 PRESSURE BOOSTING FUNCTION

The E.box panel can be used for making a system to increase water pressure. As control inputs, either pressure
switches on a pressure sensor can be used. To operate, the panel requires an expansion vessel.

5.1 Expansion vessel

In pressure boosting it is necessary to use an expansion vessel of at least 19 litres per pump.

5.2 Electrical connections of pump and supply

Connect the supply line and the pumps as described in the chapter ELECTRICAL CONNECTIONS.
5.3 Connection of additional protections: high pressure, low pressure and motor thermal
protection
It is possible, but not necessary, to use the alarm inputs to the E.box so that the pumps stop in the case of pressure
that is too high, too low, or too high motor temperature. In the case of an alarm, the pumps stop, the alarm leds blink,
the corresponding alarm outputs are activated. If the display is present, the type of alarm is indicated. When the alarm
conditions no longer exist, the E.box resumes normal operation.

Alarm, Pressure in system too high: the pressure switch must be installed in the delivery of the set. The
normally closed contact of the pressure switch must be connected to terminal R of the E.box. The pressure
switch must be set at the maximum pressure that can be reached by the system. If it is not used, the contact
is jumpered.

Alarm, Pressure in system too low: the pressure switch can be installed either on suction or on delivery
depending on the type of system. The pressure switch must be connected to terminal N of the E.box, it must
be set at the minimum pressure necessary for the system to work correctly. The contact must open if the
pressure falls below the minimum value. This contact may be used either to prevent blocks for lack of water or
to discover burst pipes. A level probe or float can also be connected to this alarm to check the state of a tank
or well. If it is not used, the contact is jumpered.

Motor thermal protection: the device has an input for the thermal protection of each motor. If the motor used
is provided with thermal protection, this protection can be connected to the terminals KK shown in Figure 9. If
there is no protection in the motor, the terminals must be jumpered.
If the alarms are not used, the corresponding inputs must be jumpered. So jumpers must be fitted on the inputs of the
contacts N, R, KK1 and KK2. These jumpers are provided with the E-box.
ENGLISH

Figure 8: Inputs and outputs

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