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25
the pre-infusion pressure.
We recommend that you do not exceed 4
bar.
WARNING:
never set the pump pressure to
a value exceeding 9 bar. Pressure higher
than 9 bar may irreparably damage the
pressure reducer.
Note: When the heating element in the
coffee boiler is energized, the water will
expand increasing the start-up pressure.
Once the maximum pressure is reached,
the expansion (safety) valve should start
working by discharging a few drops of
water, in order to prevent such pressure
from exceeding 5-6 bar.
In case the pressure exceeds 6 bar, you
must adjust the expansion valve by
unscrewing the cap slightly. If this is not
sufficient, remove the valve and clear away
any calcium deposits. This remedy is valid
also in case the valve remains open in the
drain position (i.e. the pressure cannot
increase to 8 bar approx.).
8) General notes for coffee preparation
The portafilters must remain heated since
they are at the lowest position of the
group itself, and they are partially isolated
due to the rubber gasket between them.
This can be accomplished by leaving the
portafilters installed in the machine when
not in use. The portafilters may also be
actively heated. This procedure may be
carried out by brewing some hot water
through the portafilter then turning off the
water flow, before making coffee.
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 6-7g). 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
(quick light brown flow). A general rule
is that a double dose should dispense
approximately 25cc or 2 fluid oz. of
espresso in approximately 25 seconds.
9) Cup Warmer
Press Cup Warmer Button for enabled or
disabled the cup warmer. This function
work in two modes continuous or timed
(see the Software Programming Manual
for further instructions).
Cup Warmer Button
10) Coffee delivery control levers
10.1) General description
The control lever consists of two levers,
called “main lever” and “secondary level”.
When at rest, both levers are disconnected
from the piston and from the spring; in
other words, simply turning the levers
causes no action to be performed on the
group.
In order to perform a flushing or a delivery,
you first need to move the levers until they
are in contact each other, to establish a
mechanical connection between the lever
assembly and the group.
Now you can lower the lever, causing
the piston to raise and the spring to be
compressed.
Summary of Contents for LEVA X
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