For model AV - fig. 2
It is essential to program the quantity of water delivered
by performing the following operations with the utmost
care. In case of doubt or difficulties, please contact our
technical service.
Introduction
The coffee metering system is based on the amount of
water which will be delivered onto the ground coffee,
already set in the filter and the filter holder, which is
measured through a water volume control system, which
is located above the group assembly flange, which con-
nects the group itself to the boiler. Inside each counter
there is a paddle wheel (which we shall call wheel for
simplicity) which rotates as water flows by.
The sequence of the water cycle is as follows:
group - counter
counter - solenoid valve
solenoid valve - diffuser
diffuser - coffee brewing spout
The wheel is designed in such a way as to rotate freely
when water is flowing by; it sends 2 signals, every com-
plete rotation, to the electronic module which processes
them and activates the solenoid valve relay of the corre-
sponding group, as well as the motor pump relay.
Such electronic module also processes the signal sent by
the boiler’s level gauge and consequently activates the
relative solenoid valve relay of the same motor pump.
PROCEDURE FOR PROGRAMMING DOSES - fig. 2
1. activate the DAN3 switch (part 12) by using the spe-
cial key supplied with the standard version;
2. press the 5th button (the one with the spiral symbol,
also used for continuous brewing) of the first control
panel from the left; at this point, the LEDs of all the but-
tons will light up which means that they are ready to be
programmed;
Variation in programming for the 3D/5 version
The DAN3 key (part 12) is not required for this version,
and in order to program the doses it is sufficient to press
the button with the spiral symbol for more than 4 sec-
onds. You can then follow the same operations as for the
standard version, which are described in the following.
N.B.
The LEDs stay on for 5 seconds after which, if no button
has been pressed, they turn off; you must then repeat
the above-mentioned procedure to turn them on again
and to prepare the electronic module for programming;
3. press the first button within 5 seconds and press it
again once you have obtained the desired amount of
coffee; at this point, the LEDs will turn off and this but-
ton will remain programmed as for the dose brewed pre-
viously;
4. repeat steps 2, 3 and 4 for the other three buttons;
any time a button has been programmed, by pressing
the button with the spiral again, the LED of the pro-
grammed button(s) will remain switched off.
5. once you have programmed the first 4 buttons of the
first control panel from the left, turn the DAN3 switch
(part 12) off; the dosage programs set according to the
above will be stored in memory and the 5th button (the
one with the spiral) will return to its function as a con-
tinuous brewing on/off button.
N.B.
The programs for the first group from the left will
become the default programs for the remaining groups,
although you may wish to program these groups differ-
ently in which case you need to follow steps 1 to 5 for
the remaining control panels. The leftmost control panel
must be programmed first; indeed, if you were to pro-
gram this last, all its settings would be automatically
transferred to the other groups.
If you decide to change any programs, you will have to
wait for a few minutes. In fact, you will not be able to set
any new program until the LEDs have turned on again,
after having activated the DAN3 switch (part 12) and
pressed the 5th button with the spiral symbol.
Each button also works as a switch and, therefore, you
may stop coffee brewing at any time, whenever you
have obtained the desired quantity, by pressing again
the same button you used to start such action.
Fault warnings
If the wheel does not send any signals to the electronic
module for more than 3-4 seconds, the LED of the but-
ton which has been pressed will start flashing. This
means that:
A) water is not flowing over the wheel and is therefore
not reaching the coffee groups, which may be due to:
1. the ground coffee being too fine meaning that the
coffee gets brewed too slowly (drop by drop or almost
so) and therefore the wheel cannot measure the water
flow within the factory-set time of the electronic module.
2. insufficient water flow past the groups (i.e. onto the
coffee powder) probably due to a combination of one or
more of the following occurrences:
- partial blockage in one of the pipes;
- a malfunctioning motor pump;
- a malfunctioning solenoid valve;
- partial blockage of the filter of the diffuser.
B) there are calcium deposits inside the water flow
counter which prevent the wheel from turning properly.
C) the wheel itself and the header (top part) of the
counter, which contains said wheel in the bottom part,
may be faulty.
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English
COFFEE BREWING CONTROL PANEL part. 5 fig 2
