27
Technical manual
ENGLISH
NERO
C:0 M:0 Y:0 K:100
ROSSO
C:0 M:100 Y:100 K:0
VERDE
C:100 M:0 Y:100 K:0
11 Electronic push button panels
(version EVD)
The electronic push button panel of the machine
permitt selection and programmation of coee doses.
They are connected to the electronic control unit.
To use and programming see the user's manual of
the specic model.
12 Pressure switch
The pressure switch makes it
possible to control boiler pressure
by activating or bypassing the
heating element in the boiler.
Any calibration of the pressure
switch which may be required can
be carried out with the machine in
operation by means of the screw
(6)
located on the body of the component.
13 Thermostat
IlThe 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 the resistance. The contacts of the
thermostat (9) are connected to the electrical resistance
(10). If the 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.
6
8
10
7
11
9
!
The internal contacts of the pressure switch may
be subject to oxidation. It is recommended to
clean the contacts regularly spraying them with
antioxidants.
!
To reset the thermostat, press the central button
(11). However, before trying to operate the
machine, verify the causes of the blockade of the
water feeding boiler.
10 Pumping system
This is a component that feeds the machine, raising
the water pressure to 8-9 bar for coee delivery and
automatic lling of the boiler
.
Depending on the whether the machine is equipped
with an inner tank, or connection to the aqueduct, it
changes, having supplied:
• motorpump
(1), in the versions with connection to the
water network;
• vibration pump (2) in the versions with inner tank.
2
1
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