La Marzocco Linea EE Betriebsanleitung Seite 16

You may press the same button again in
order to terminate coffee brewing before
its programmed stop. If you need an
unusual amount of coffee, you may use the
button with the spiral symbol and press it
again once you have obtained the desired
quantity.
Once the coffee has been completely
brewed, the pressure in the filter holder
is discharged automatically, the portafilter
may then be removed to repeat the operation
as needed.
GENERAL NOTIONS FOR PREPARING COFFEE
When the machine has reached its
operating pressure, 1.2 - 1.5 bar which
may be checked by looking at the upper
scale in the pressure gauge (part 3 fig. 1, 2
or 3), and its operating temperature at the
same time, with the body/group already at
infusion temperature, the filter holder and
filter must be heated more since they are
at the lowest position of the group itself,
and they are partially isolated from the
same due to the rubber gasket between
them. This operation may be carried out by
activating the paddle (fig. 2, part 1) or the
switches (part 5, fig. 1 or 3) and keeping
them in the brewing position for approx.
15
45 seconds, at which point they must be
turned off and you must wait for 2-3 more
minutes.
During this time, the pointer of the lower
scale of the pressure gauge (part 3, fig.
1 or 3; or fig. 2, part 4) may reach as
high as 11-12 bar; this may occur any
time that, while activating the groups,
the motor pump forces cold water into
the coffee boiler at a pressure of 8-9 bar
and, simultaneously, the PID controller
regulating the temperature of the boiler
itself switches on the heating elements
in order to bring the water contained in
such boiler up to operating temperature.
However, in this case it is necessary to
adjust the expansion valve (marked 19A in
fig. 4) in such a way that the pressure may
never exceed 12 bar.
The size of the coffee granules is extremely
important in preparing a good cup of coffee,
as is the type of coffee mix used.The ideal
grind can be determined by making various
coffees using the amount of ground coffee
that you would normally use for each cup
(we recommend at least 7 g). The best
grind is that which allows coffee to flow
out from the filter holder spouts neither too
slowly nor too quickly.
IMPORTANT
The temperature of the water in the coffee
boiler, and therefore of the groups, may
eventually be raised or decreased by means
of the PID temperature controller (part 22,
fig.4) - see next chapter for further details.
The final adjustment should be made
during tuning-up, once the machine has
been permanently installed. The pressure
of the water on the coffee during the
brewing is very important. For this reason
it is important to set the by-pass on the
pump at 9 bar. This value changes if there
are variations on the incoming pressure
from your local water system. If there are
variations, make the necessary technical
adjustments on the system in order to
eliminate them.
CAUTION
NEVER REMOVE THE FILTER HOLDER WHEN
WATER IS BEING DELIVERED.
THIS OPERATION CAN BE ExTREMELY DANGEROUS
SINCE THE HIGH PRESSURE BUILT-UP INSIDE THE
BLIND FILTER WOULD SPRAY OUT HOT AND
SLIGHTLY CAUSTIC WATER, WHICH MAY
CAUSE SEVERE BURNS. THE COFFEE BOILER CONTAINS
WATER AT ELEVATED TEMPERATURE. WATER
TEMPERATURE OVER 125°F / 52°C CAN CAUSE
SEVERE BURNS INSTANTLY OR DEATH FROM SCALDING.