4.4 COFFEE VALVE
Each unit is provided with a three-way valve
called coffee valve.
It is a solenoid valve that is normally closed and
opens when it received a command to dispense
coffee.
When this valve is closed the liquid that remains
in the hydraulic circuit is pushed by pressure
towards the third valve passage, connected to
the wastewater collector.
In this way the water that was under pressure in
the group and which is unable to pass through
the coffee tablet, is pushed towards the third
valve passage, drying the coffee tablet.
TYPICAL PROBLEMS:
If there are problems related to a very wet coffee
tablet, there are three possibilities to be exam-
ined:
1 The third passage of the valve is obstructed,
therefore the final suction is less than it
should be.
2 Shower and pavilion are blocked because of
poor machine cleaning.
3 The group is constantly dripping, thereby
wetting the tablet.
HOW TO REPLACE THE COFFEE VALVE:
To remove the coffee valve after having removed
the front panel (Section 3.3) it is necessary to:
1 Remove the screw of the head as shown in
figure.
2 Remove the cable holder using pliers.
Fig. 102
Edition 01 of 08/2017
4.8
SERVICE MANUAL
Fig. 103
Fig. 104
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