La Marzocco strada ep Operating Manual - page 17
EN
17
Paddle it is possible to vary the speed of
the gear pump, as much it will be turned
as faster the pump will go.
Note: Some baristas suggest flushing the
group with water to remove remaining
coffee oil or particles. Some flush after
every shot. Experimentation and practice
is suggested to establish the best possible
procedure for brewing coffee.
6) 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.
7) General notes for coffee preparation
The portafilters must remain heated since
they are at the lowest position of the
group itself, and they are partially isolated
due to the rubber gasket between them.
This can be accomplished by leaving the
portafilters installed in the machine when
not in use. The portafilters may also be
actively heated. This procedure may be
carried out by brewing some hot water
through the portafilter then turning off
the water flow, before making coffee.
It is important to remember that coffee
left over in the filters must be removed
only when you need to prepare another
cup, and only at that time should you
place a new dose of ground coffee in the
filter.
The size of the coffee granules is extremely
important in preparing a good cup of
coffee, other than the type of coffee mix
used, quite obviously. The ideal grinding
can be determined by making various
coffees using the amount of ground coffee
that you would normally use for each
cup (we recommend at least 6-7g). The
best grinding is that which allows coffee
to flow out from the filter holder spouts
neither too slowly (drop by drop) nor
too quickly (quick light brown flow). A
general rule is that a double dose should
dispense approximately 25cc or 2 fluid oz.
of espresso in approximately 25 seconds.
IMPORTANT
To improve the flavor of the espresso,
the temperature of the water in the
coffee boiler and therefore of the groups
may eventually be raised or lowered
via the digital display (please consult
the Software Programming Manual for
detailed instructions).
cAutIoN
NEVER REMOVE THE FILTER HOLDER WHEN
WATER IS BEING DELIVERED.
THIS OPERATION
CAN BE EXTREMELY DANGEROUS SINCE THE
HIGH PRESSURE BUILT-UP INSIDE THE BLIND
FILTER WOULD SPRAY OUT HOT AND
SLIGHTLY CAUSTIC WATER, WHICH MAY
CAUSE SEVERE BURNS.
THE COFFEE BOILER CONTAINS WATER AT
ELEVATED TEMPERATURE. WATER
TEMPERATURE OVER 125°F / 52°C CAN
CAUSE SEVERE BURNS INSTANTLY OR
DEATH FROM SCALDING.