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TECHNICIANS manual
2.6.10 Safety thermostat
The thermostat allows you to avoid damage to the
electrical resistance in case of lack of water in the boiler.
The thermostat bulb (7) is located inside a sheath (8)
placed at the center of resistance. The contacts of the
thermostat (9) are connected to the electrical resist-
ance (10). If the electrical resistance is exposed due to
failure to load water to the boiler, the temperature of
the resistance increases dramatically. At this point, the
thermostat interrupts the power supply to the resistance
thus preventing damage.
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911
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8
To reset the thermostat, press the center button (11). However,
before trying to operate the machine, verify the causes of the
blockade of the water feeding the boiler.
2.6.11 Motor pump
This is a component that feeds
the machine, raising the water
pressure to 8 - 9 bar for coffee
dispensing and automatic lling
of the boiler.
2.6.12 Electronic control unit
The electronic control unit is installed
on EVD and DISPLAY versions.
Its purpose is to electronically control
the coee dose by means of the water
owing through the dosing device and to
check the lling of the water in the boiler.
Some versions of the control unit are
set up to be connected to the dispensing accounting
systems by means of a specic interface device.
2.6.13 Automatic Water Entry
The Automatic Water Entry system is for checking the
boiler level. It is composed of:
t probe inserted in the boiler (1) composed of a stain-
less steel rod;
t standard control unit (2) on EVD-DISPLAY versions,
electronic level regulator on the other versions (3);
t hydraulic circuit with a solenoid valve controlled by
the regulator.
The electronic control unit controls the level of water
in the boiler. When the level of water in the boiler drops,
the contact with the probe is interrupted. The control
unit sends and impulse to the entry solenoid valve and
to the motor pump, which act to restore the normal level
of water in the boiler.
To avoid possible ooding due to machine malfunc-
tions or leaks in the hydraulic circuit, the electronic
control unit includes a “Time-out” feature that cuts o
automatic lling after a certain time (2 minutes). The LED
(4) located on the front of the machine body comes on to
indicate activation of this system. During the installation
of machines with three or four groups the initial water
lling time may exceed the established time limit. In this
event, just switch the machine o and then back on to
restore normal operating conditions.
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