TECHNICIANS' manual
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16 di 52
2.8.7 Dispensing group
In this system, the dispensing group (26) is heated by a ther-
mosiphonic circuit (A) connected to the heat exchanger (B).
The same water is used for the coee dispensing, thus ensur-
ing the same temperature for all coee servings:
• The solenoid valve and the pump are activated in order to
send cold water to the exchanger (B) through the injector
(C).
• The heating unit water is carried from the exchanger (B) to
the group (26) for dispensing;
• the pump allows the increase of the pressure of the water
flow up to 8-9 bar for dispensing.
The injector (C) and flow reducer (D) are important compo-
nents for the dispensing group’s operation.
To increase the coee extraction temperature, remove the
flow reducer (D) or replace it with one that has a bigger diam-
eter. To decrease the temperature, replace it with one that has
a smaller diameter.
Water
inlet
Dispensing
coee
DISPENSING
D
B
C
A
26
B
IDLE
When replacing the solenoid valve (E), make sure that it is po-
sitioned correctly. The assembly must be as such that the two
holes (F) on the body of the group are aligned with the two
gaskets (G) on the solenoid valve.
E
G
F
2.8.8 Safety thermostat
The thermostat prevents any damage occurring to the electri-
cal heating element if there is no water in the heating unit.
The thermostat bulb (A) is located inside a sheath (B) in the
middle of the heating elements. The thermostat contacts (C)
are connected to the electric heating element (D). If the elec-
tric heating element is exposed due to a failure to fill the heat-
ing unit with water, the temperature of the heating element
increases dramatically. At this point, the thermostat cuts the
power supply to the heating element in order to prevent dam-
age occurring
D
C
E
A
B
To reset the thermostat, press the centre button (E).
However, before starting the machine up again, iden-
tify what prevented the water from being fed into the
heating unit.
2.8.9 Motor pump
This component feeds the machine
by increasing the water pressure to
0.8-0.9 MPa (8-9 bar) in order to dis-
pense coee and automatically fill
the heating unit.
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