La Marzocco Linea EE Betriebsanleitung Seite 21

DIFFUSER SCREEN /
SCREW
INFUSION FILTER
DIFFUSER - fig. 5
Motor Pump
The motor pump is of the positive-displa-
cement type and can develop a pressure of
14 bar. The operating pressure is 8-9 bar
and is factory preset during testing; howe-
ver, such pressure may vary from place to
place since the pump pressure is affected
by the incoming water mains pressure. You
must always check the pressure itself by
looking at the lower scale on the pressure
gauge (part 3, fig. 1 or 3; part 4, fig. 2)
whenever you are brewing coffee, and you
can increase such pressure, as required,
by turning the by-pass screw (below the
plug located on the side to which the pump
power supply is connected) clockwise, or
reduce it by turning the screw counter-
clockwise. Adjust pressure only when at
least one group is brewing coffee.
IMPORTANT
When you activate the motor pump by pres-
sing 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 tem-
perature increases, the liquid will expand
increasing the start-up pressure by about
3 bar, for a total pressure of 11 bar. Once
operating pressure is
reached, the expan-
sion (safety) valve
(part 19A) should start
working by discharging
a few drops of water, in
order to prevent such pressure from excee-
ding 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 depo-
sits. 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
- 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
low these safety indications:
- Disconnect the machine from the water
mains or interrupt the water connection 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
WARNING
IF THE ABOVE-MENTIONED INSTRUCTIONS ARE NOT
ADHERED TO THE MANUFACTURER CANNOT BE HELD
RESPONSIBLE FOR DAMAGE TO PERSONS OR THINGS.
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