Coffee brewing
Once you have made sure that the filter holders (Fig. 4
and part 4) have been properly tightened, you should
press the brewing buttons (part 5) 2 or 3 times and hold
them pressed a few seconds each time, in order to pre-
heat the holders. You may then remove the one that you
want to make coffee with (1 or 2 cups), together with its
own filter, and proceed to place some ground coffee in
the filter itself: 1 dose (approximately 6 g) for the small
filter, 2 doses (2 coffees) for the larger filter. Press down
on the ground coffee with the supplied tamper and
tighten the filter holder again onto the bottom of the
group and then press one of the buttons with the sym-
bols for 1 or 2 cups, strong (short) or long.
You may press the same button again in order to termi-
nate coffee brewing before its programmed stop. If you
need an unusual amount of coffee, you may press 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 pres-
sure in the filter holder is discharged automatically, and
the latter may then be removed in order to repeat the
operation, as requested.
GENERAL NOTIONS FOR PREPARING COFFEE
When the machine has reached its operating pressure,
1.5 bar which may be checked by looking at the upper
scale in the pressure gauge (part 3 Fig. 1 or 2), 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 par-
tially isolated from the same due to the rubber gasket
between them. This operation may be carried out by
activating the switches (part 5, Fig. 1 or 2) and keeping
them in the brewing position for 10-15 seconds, at
which point they must be turned off and you must wait
for 2-3 more minutes.
During this time, it may happen that the pointer of the
lower scale of the pressure gauge (part 3, Fig. 1 or 2)
reach as high as 14-15 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 thermostat regulating the tempera-
ture 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 nec-
essary to adjust the 19A expansion valve (Fig. 3) in such
a way that the pressure may never exceed 11 bar.
It is important to remember that coffee left over in the
filters must be removed only when you need to prepare
another cup, and only at that time should you place a
new dose of ground coffee in the filter.
The size of the coffee granules is extremely important in
preparing a good cup of coffee, other than the type of
coffee mix used, quite obviously. The ideal grinding 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 6 g).
The best grinding is that which allows coffee to flow out
from the filter holder spouts neither too slowly, drop by
drop, 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 its own thermostat (part 22,
Fig.3); by turning the adjusting screw a full 360° clock-
wise, the temperature will increase by approx. 8°C, and
vice versa. The final adjustment should be made during
tuning-up, once the machine has been permanently
installed, and should not exceed a quarter of a turn (90°)
of the screw clockwise or counter-clockwise, which cor-
responds to a change in temperature of approximately
2°C. 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.
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