La Marzocco Linea PB, Operating Manual

Page: 11 / 64

EN
10
When brewing, the pressure should be set
to 9 bar.
When the steam boiler reaches operating
temperature, the light on the Tea dispense
button will light.
When the espresso machine is ready to
operate all lights on the keypads will light.
3) 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
4) Installing the portafilters
Install the portafilter(s) by inserting them
into the group and rotate the handle from
left to right. When the portafilters are
inserted properly, you can press any of
brew buttons to start the flow of water
through the portafilter. You should allow
hot water to pass through the empty
portafilter(s) for a few seconds each time,
in order to pre-heat 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.
5) 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. Adjust pressure only when at
least one group is brewing coffee.
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 11-12 bar.
In case the pressure exceeds 12 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.).
6) Brewing coffee
It is now possible to remove one of
the portafilters to make an espresso
beverage. Place some ground coffee in
the filter itself: 1 dose (approximately
6-7 g) for the small filter, 2 doses (2
approximately 12-15 g) for the larger
filter. Press down on the ground coffee
with the supplied tamper and install the
filter holder up again to the bottom of
the group and then press a button (AV
model) to begin the brewing process, or
move the paddle lever (MP model).
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
Filter Basket
Porta Filter
O-ring Gasket
Double Spout