espresso coffee machine - technician instructions
22
- english
R
7
9
11
10
8
9. 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.
10. 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
resistance
(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.
6
ATTENTION
The internal contacts of the pressure switch may be subject to oxida-
tion. It is recommended to clean the contacts regularly spraying them
with antioxidants.
ATTENTION
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
11. PUMPING SYSTEM
This is a component that feeds the machine, raising the water pressure to 8-9 bar
for coffee delivery and automatic filling of the boiler.
