Machine Operation And Coffee Preparation - La Marzocco MAN.1O.MULTI Mode D'emploi

Once installation has been completed, you
can proceed to hook up the filter holders
(Fig. 6) called portafilters, together with
their filters, to the bottom of the groups
by rotating them from left to right. Before
operating the various switches and thus
powering up the heater elements, fill up the
boiler tanks with water, as follows:
1. COFFEE BOILER
The water flows inside the coffee boiler
directly, as soon as the water system and
purifier taps are opened. Since the inflowing
water will compress the air in the boiler it
will be necessary, in order to completely
"saturate" the boiler-groups assembly, to
remove the group cover plate (part 20 Fig.
4) and unscrew the small bolt (part 21)
called bleed screws a little way so as to
allow air to escape until a few drops of water
leak out (see diagram below). This should
be repeated for each group, then tighten the
bleed screws again and reinstall the cover.
Saturation of group via "bleed screw"

4. Machine Operation and Coffee Preparation

2) STEAM BOILER
By turning the main switch (part 1) to
position "1", the automatic fill system
will be switched on which, by activating
the solenoid valve and the motor pump
(part 15), will fill the steam boiler up to a
predetermined level selected by adjusting
the probe inside the boiler itself.
N.B.
It may happen that the air inside the
boiler builds up pressure (which may be
detected through the pressure gauge - part
3, Fig 1, 2 or 3) To resolve this, turn the
machine off and bleed the air from the
groups (see previous page for instructions).
Once you have completed these operations,
turn the main switch (part 1) to position
"2" and wait for the boilers to reach
operating temperature and pressure (which
takes from 20 to 35 minutes, depending
on the size of machine), which will be
subsequently maintained at a constant
value automatically.
During this time, the pointer of the lower
scale on the pressure gauge (part 3, fig. 1
or 3; or part 4 fig. 2) may reach as high as
11-12 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 temperature controller regulating the
temperature 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 necessary to adjust the expansion
valve (Fig. 4, part 19A) in such a way that
the pressure may never exceed 12 bar.
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
- At least 3 liters for a 4 group machine
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