La Marzocco linea Bedienungsanleitung Seite 26

IMPORTANT
When you activate the motor pump by
pressing the specific button (part 8, fig.
1 or 3) you also give pressure directly to
the coffee boiler. If you activate the motor
pump when the machine is cold, a start-
up pressure of 8-9 bar will develop; thus,
once the heating elements start working
and the water temperature increases, the
liquid will expand increasing the start-up
pressure by about 3 bar, for a total pres-
sure of 11 bar. Once operating pressure is
reached, the expansion (safety) valve (part
19A) should start working by discharging
a few drops of water, in order to prevent
such pressure from exceeding 12 bar.
If the pressure exceeds 12 bar, you must
adjust the 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 if the
valve remains open in the drain position
(i.e. the pressure cannot increase to 8 bar
approx.).
If the machine has not been used for more
than 8 hours or, in any case, after long
periods of being idle, in order to use the
machine to its full potential it is necessary
to perform some cleaning cycles before
brewing beverages as follows:
- Groups: with the portafilters engaged
in the groups brew water through each for
at least two minutes
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- 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
At least 3 liters for a 4 group machine
If the machine is not going to be used
for long periods of time, it is advisable to
follow these safety indications:
- Disconnect the machine from the
water mains or interrupt the water con-
nection via a mains tap.
- Disconnect the machine from the elec-
trical mains.
• Steam boiler draining: Yearly, we recommend
to fully drain the steam boiler by means of
the specific drain cock located on the side
of the boiler or under the boiler
• Depressurize the steam boiler
Press and hold the encoder knob to set
the espresso machine to "OFF", then
push down the steam lever in order to
depressurize the steam boiler.