La Marzocco LEVA X, Руководство пользователя

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reaches as high as 14-15 bar. This may
happen anytime that the heating element
is in the “on” condition. In this case, it
is necessary to adjust the expansion valve
(see the picture below about the three
coffee boiler expasion valves) in such a
way that the pressure never exceeds 6 bar.
Expansion Valve
The steam boiler pressure can be read
through a pressure gauge located inside
the machine, behind the control and the
1st group.
When the steam boiler reaches operating
temperature, the light on the Tea dispense
button will switch on.
4) Brewing after first installation
Once the first installation procedures are
finished, before proceeding with brewing
coffee, hot water and steam, please follow
these steps:
• Engage the portafilters by inserting
them into each group, brew water through
each group for at least two minutes.
• Being careful to avoid burns, turn on
each steam wand for at least one minute.
• Turn on the hot water valve for the time
necessary to allow the following quantities
of water to be brewed:
- At least 1 liter for a 1/2 group machine
- At least 2 liters for a 3 group machine
5) Installing the portafilters
Install the portafilter(s) by inserting them
into the group and rotate the handle from
left to right. After properly inserting
the portafilter you can operate the lever,
lowering it by a few degrees to let water
flow out of the portafilter. You should
allow hot water to pass through the empty
portafilter(s) for a few seconds each time,
in order to preheat the portafilter.
Note: It is important to leave the portafilters
installed in the espresso machine when
not in use. The portafilter must remain
heated for the brew process to function
correctly.
Filter Basket
Porta Filter
O-ring Gasket
Double Spout
6) Brewing coffee
Now you can brew an espresso. Disengage
one of the portafilters, fill the filter with
ground coffee, tamp the ground coffee with
the tamper supplied (exerting a force of
20 kg) and re-engage the portafilter to the
group. Operate the lever and raise the piston
by the desired amount to load the water.
Wait for a few seconds until the pressure
read by the analogue or digital pressure
gauge reaches the pre-infusion value.
From now on you can release the lever to
start the delivery process. Before releasing
the lever slightly move it upward, then
keep raising it until reaching the vertical
rest position.
Note: Some baristas believe it is important
to press the brewing button prior to
installing the portafilter to allow the water
to flush any remaining coffee oils and
particles from the group. Some also flush
just after brewing coffee for the same
reason. Please experiment to find the best
possible procedure for you.
7) Water pump
Whenever you are brewing coffee, and you
can adjust the pump pressure by turning
the by-pass screw (below the plug located
on the side to which the pump power
supply is connected) clockwise to increase
and counter-clockwise to reduce pressure.
Set pressure to a value slightly higher than