ENGLISH
28
TECHNICAL MANUAL
8. MACHINE COMPONENTS
8.1 Boiler
The boiler is made to copper plate inside which the heat exchangers and the
electric heating element (
1
) are housed. The heating element heats the water in
the boiler.
Water to make coffee is taken from the heat exchanger while it is taken from
the boiler if hot water is wanted. Steam is taken from the top of the boiler.
8.2 Heat exchanger
The heat exchangers (
2
) make it possible to heat the water up to an ideal
temperature for a perfect cup of espresso coffee.
The heat exchangers function is to produce an exchange of thermal energy
between the water inside it and the water inside the boiler.
This component cannot be replaced.
8.3 Automatic Water Inlet
The AEA system (automatic water inlet) is used to control boiler level. It
consists of:
l
a working level probe (
3
);
l
a minimum safety level probe (
2
);
l
an electronic level regulator in the electronic control unit;
l
a hydraulic circuit with a solenoid valve (
1
) controlled by the control unit.
The level probes act as a pole in the low voltage electrical circuit: when
the level of the water drops the circuit interrupts itself and the electronic
control unit sends an impulse to the AEAs solenoid valve (
1
) and to the motor
pump which sees to the automatic fillng up with water, keeping the level in the
boiler constant.
8.4 Volumetric doser
The volumetric doser (
5
) measures the quantity of water sent to the unit for making
espresso coffee.
It consists of a Hall-effect type turbine (
6
) which, by turning, generates an electric
impulse that is sent to the electronic control unit.
This impulse is read by the control unit and stored during dose programming.
Each flash of the LED (
4
) on the volumetric doser indicates that the doser is working
properly.
6
4
5
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