La Marzocco linea Bedienungsanleitung Seite 19

group assembly flange, where the group
connects 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 complete rotation,
to the electronic module which processes
them and activates the solenoid valve
relay of the corresponding 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. 3
Programming for the 3D/5 version
Press and hold the button with the spiral
symbol for more than 4 seconds.
You can then follow the same operations
as for the standard version, which are
described in the following.
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;
1. 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
button will remain programmed as for the
dose brewed previously;
2. repeat steps for the other three buttons;
any time a button has been programmed,
by pressing the button with the spiral
again, the LED of the programmed
button(s) will remain switched off.
3. once you have programmed the first 4
buttons of the first control panel from the
left, 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 continuous
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 differently
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
program this last, all its settings would
be automatically transferred to the other
groups.
It is recommended that each group be
programmed separately, from left to right.
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 the same
button.
Fault warnings
If the wheel does not send any signals to
the electronic module for more than 3-4
seconds, the LED of the button 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) and therefore the wheel
cannot measure the water flow within the
factory-set time of the electronic module.
2. insufficient water flow through 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 diffuser screen.
B) there are calcium deposits inside the
water flow counter which prevent the
wheel from turning properly.
C) the wheel itself and the sensor (top
18