TECHNICIANS' manual
- English -
17 di 52
2.8.10 Electronic control unit
The electronic control unit is installed on the
EVD versions.
Its purpose is to electronically control the cof-
fee dose via the water flowing through the
dosing device and to check that the heating
unit is being filled with water.
Some versions of the control unit are set up to
be connected to the dispensing accounting systems by means
of a specific interface device.
2.8.11 Automatic Water Entry
The Automatic Water Entry system is designed to check the
water level in the heating unit. It consists of:
• A probe inserted into the heating unit (A) consisting of a
stainless steel rod.
• The standard control unit (31) on EVD versions.
• A hydraulic circuit with a solenoid valve controlled by the
regulator.
The electronic control unit controls the level of water in the
heating unit. When the level of water in the heating unit
drops, the contact with the probe is interrupted. The control
unit sends an impulse to the inlet solenoid valve and the mo-
tor pump, which are then activated until the normal level of
water in the heating unit has been restored.
To avoid any flooding caused by machine malfunctions or water
leaks in the circuit, the electronic control unit has a “Timeout”
feature which cuts o the automatic water filling function af-
ter a certain time (2 minutes). The LED (3) located on the front
of the machine body comes on to indicate activation of this
system. When installing machines with three or four groups,
the initial water filling time may exceed the established time-
out limit. Should this occur, simply turn the machine o and
then back on to restore normal operating conditions.
2.8.12 Volumetric dosing
The volumetric dosing device
that is installed on the EVD
versions, measures the quan-
tity of water sent to the group
in order to dispense coee.
The dispenser generates elec-
trical impulses which are sent
to the electronic control unit.
These impulses are read by the
control unit and counted while the dose is being programmed.
The flashing LED light (A) indicates that the electrical impulse
has been sent from the dosing device to the control unit.
2.8.13 Electronic pushbutton panels
The electronic pushbutton panels (5), (17) allow the coee
doses to be selected and programmed. They are connected to
the electronic control unit.
To use and programme these, please consult the user manual.
5 17
2.8.14 Cup warmer
The cup warmer device (7) warms the cups before they are
used.
7
A
31
A
1 2
0
3
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