La Marzocco strada ep 1, Руководство пользователя, Страница: 12 / 30

EN
12
coffee, hot water and steam, please follow
these steps:
• Engage the portafilter by inserting it into
the group head and rotate the handle from
left to right. Once the portafilter is inserted
properly, you can move the paddle on the
left side to start the flow of water through
the portafilter. Brew water through the
group for at least two minutes.
• Being careful to avoid burns, turn on
steam wand for at least one minute.
• Turn on the hot water valve for the time
necessary to allow at least 1 liter of
water to be brewed.
5) Waiting for the espresso machine to heat to
operating temperature.
During this time, the pointer of the coffee
boiler pressure gauge may reach as high as
12 bar. This may happen anytime that the
heating element is in the “on” condition.
If the pressure exceeds 12 bar then it will
be necessary to adjust the expansion valve
in such a manner that the pressure never
exceeds 12 bar.
In normal operating conditions, the coffee
boiler pressure gauge can read anywhere
from 0-12 bar. When brewing, the pressure
should be set to approximately 9 bar.
NOTE: As the steam boiler reaches operating
temperature you may hear air and steam
escaping from the boiler. This is a normal sound.
As the water boils, air in the boiler is replaced by
steam and exits through the vacuum breaker. As
Figure 2 - Expansion Valve Adjustment
Decrease
pressure
Increase
pressure
the boiler get closer to operating temperature
the vacuum breaker closes and the steam is
no longer able to escape. This process allows
the air in the steam boiler to escape and to be
replaced by water vapor.
6) Machine plate:
• Machine CE plate 7) Adjusting the expansion valve.
The expansion valve is a component
that limits the maximum pressure in the
coffee boiler. Heating the coffee boiler
causes the water within to expand. Since
the coffee boiler is completely saturated,
the expanding water causes an increase
in pressure within the boiler. Without a
safety device the increase in pressure
could cause a rupture in the boiler.
The pressure in the coffee boiler should
never exceed 13 bar. The valve is hot,
so, using adequate protection, rotate the
expansion valve clockwise to increase
pressure. To decrease pressure, rotate the
expansion valve counter clockwise (see the
following diagram).
ST000000 01/16
STRADA 1EP
60
220 9,2 2037
STRADA 1EP
50/60
10 220-240
01/16 ST000000
2220