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4.7 COFFEE VALVE
The infusion group is provided with a three-
way valve called coffee valve.
It's a solenoid valve that is normally closed
and opens when it receives a command to
dispense coffee.
When this valve is closed, the liquid remain-
ing in the group is pushed by pressure
towards the third outlet of valve, that is con-
nected to the exhaust manifold.
When this occurs, the water under pressure
in the group, that cannot pass through the
coffee cake, is pushed towards the third
outlet of the valve, thereby drying the cake.
TYPICAL PROBLEMS
If there are problems connected to the cof-
fee cake being completely soaked, three
hypotheses can be evaluated:
The third outlet of the valve is obstructed,
therefore the final section is less than it
should be.
Shower and pavilion are blocked be-
cause of poor machine cleaning.
The group always drips, therefore soaks
the cake.
4.7.1 REDUCING OF THE COFFEE
BOILER INNER PRESSURE
Before to proceed with some operations,
if the machine is hot, it is suggestable to
reduce the inner pressure of the coffee boil-
er, to avoid spurts of hot water.
Proceed following the EMPTY BOILER proce-
dure in Chapter 9.
It is enough to follow the procedure just for
10 seconds to reduce the coffee boiler inner
pressure.
4.7.2 REMOVAL OF THE COFFEE
VALVE
To replace the coffee valve, if the machine
is hot, it is suggestible to reduce the inner
pressure of the coffee boiler, as explained in
the previous paragraph.
Then it is necessary to:
Turn the machine OFF.
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