La Marzocco GS/3 Owner's Manual page 8

brew process by pressing button #5 (the
continuous button) to force the air out of
the group. Tighten the screw to stop the
water from flowing. Over-tightening can
cause damage to the sealing washer and
the group cap. If this sealing washer
is damaged replace washer with one
included in accessory kit. Once all air is
removed from the coffee boiler, reinstall
the group cover. For more detailed
instruction please refer the
Installation Guide.
NOTE: It may be necessary to re-fill the
water reservoir during this process.
Check to see if the "Water Tank Empty"
error message is present on the display
before continuing.
4) Verify filling of Boilers.
The installation is now complete and the
espresso machine should be heating to
the operating temperatures.
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 portafilter by inserting
it into the group head and rotate the
handle from left to right. Once the
portafilter is inserted properly, you can
8
press one of the brewing buttons on the
keypad 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 each steam wand for at least
one minute.
• Turn on the hot water valve for the time
necessary to allow the at least 1 liter of
water to be brewed.
GS/3
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 exceed 12 bar.
In normal operating conditions, the
coffee boiler pressure gauge can read
anywhere from 0-12 bar. When brewing,
the pressure should
approximately 9 bar. When the espresso
machine is ready to operate all lights on
the keypads will light up.
Figure 4 - Key Pad buttons
Figure 5 - Key Pad buttons with
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 the boiler get closer to operating
temperature
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.
be set to
lights on
the vacuum breaker