La Marzocco GS/3 User manual
Version 1.02
HANDMADE IN FLORENCE
GS/3
Installation Guide
GS/3
English
1
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Table of Contents
Installation Guide
1. Unpackage GS/3 Espresso Machine.................................................................. 2
2. Fill with water (Initial Fill)..................................................................................... 2
2a. Drain Box Alignment............................................................................................ 3
3. Connect to power supply..................................................................................... 4
4. Turn on main power ........................................................................................... 4
5. Turn on espresso machine.................................................................................. 5
6. Remove group cover........................................................................................... 5
7. Remove air from group head (bleeding the group)............................................. 6
8. Monitor coffee boiler pressure............................................................................. 6
9. Adjust the expansion valve.................................................................................. 7
10. Monitor steam boiler pressure............................................................................. 7
11. Brew espresso..................................................................................................... 8
12. Verify working boiler pressures........................................................................... 8
13. Connect to main water supply............................................................................. 9
Congratulations on your purchase of the
La Marzocco GS/3 espresso machine!
For the latest up to date information on the
GS/3 please visit our GS/3 website:
http://www.lamarzocco.com/gs3.html
Version 1.02
English
2La Marzocco, S.r.l. Firenze, Italia
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1
Unpackage espresso machine and set on a level surface. Ensure all accessories are
included with shipment. Check for any visable damage to espresso machine.
Fill Cover
Water Reservoir
Finger Grips
Drain Box
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Installation Guide
Remove/Open the fill cover and fill the reservoir with filtered water. Slide the reservoir back
into position and replace the drain box. Make sure the drain box is inserted fully. The water
reservoir must make contact with the level indicators on the rear side. Failure to make
contact will result in the display message “Refill Tank”. The message “Refill Tank” will be
displayed anytime the reservoir does not have contact with the level indicators.
NOTE: The GS/3 is configured to work with the water reservoir. To connect the GS/3 to the
mains water supply and the waste drain system, please refer to the section 13.
Version 1.02
GS/3
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Installation Guide
Alignment Holes
Alignment
Pins
IMPORTANT NOTE:
The drain box must be installed correctly for the machine to function properly. The drain box has
two alignment pins that mate with two alignment holes on the base of the GS/3. When installing
the drain box, ensure that the alignment pins are inserted into the alignment holes. It may be
necessary to push slightly on the front of the drain box to achieve proper alignment.
2a
2a
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4La Marzocco, S.r.l. Firenze, Italia
Installation Guide
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Connect the power cord to a power supply capable of supplying: 230 VAC and 10 amps (for
the 230 V version) or 120VAC and 15 Amps (for the 110 V version).
Turn on power by pressing the main power switch. The main power switch may be found on
the left rear of the machine.
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Turn the Espresso machine on by pressing the on/off key (key #6). The espresso machine
will begin to fill both the steam boiler and the coffee boiler simultanously. The machine will
stop filling when the water reservoir is low. When the message “Refill Tank” is displayed,
refill the water reservoir. See Step #2 to fill water reservoir.
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6
Now it is necessary to remove all of the air in the coffee boiler and saturate the group. This
is commonly referred to as bleeding the group. To do this, remove the group cover by
rotating the cover counter clockwise.
Installation Guide
Version 1.02
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6La Marzocco, S.r.l. Firenze, Italia
Installation Guide
Unscrew the bleed screw (approximately 1/2 turn) to release all air from the coffee boiler
(using the included 5mm hex key wrench). When water leaks from under the screw head,
tighten the screw. Note: It might be necessary to activate the brewing process to force water
into the boiler. To do this, press the continuous key until water leaks from under the screw
head. Then tighten screw. Replace group cover removed in step #6.
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Next it will be necessary to check the expansion valve. As the coffee boiler heats to operating
temperature the pressure in the coffee boiler will rise. There is an expansion valve behind the
drain tray that allows some water to escape during this process to limit the maximum pressure
in the coffee boiler to 12 bar. Please monitor the coffee boiler pressure gauge during the initial
heating process. You should notice the gauge approach 12 bar and stop. If the pressure gauge
does not reach 12 bar or if the pressure gauge rises above 12 bar, then it will be necessary to
adjust the expansion valve. Please follow the next step to properly adjust the expansion valve.
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Steam Boiler
Pressure Gage
Coffee Boiler
Pressure Gage
Version 1.02
GS/3
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Please follow this procedure if it is necessary to adust the expansion valve. First remove the
drain box to access the expansion valve. The expansion valve protrudes through the sheet metal,
has the shape of a cylinder, is brass in color and approximately 25mm in diameter. To adjust the
expansion valve rotate the valve clockwise to raise the pressure and counter clockwise to reduce
the pressure. It may be necessary to use a tool such as a pair of pliers to rotate the expansion
valve Adjust in 1/4 turn or less increments until the desired pressure is achieved. Replace the
drain box after each adjustment to ensure the machine is operating correctly.
Expansion Valve
Drain Box
Steam Boiler
Pressure Gage
Coffee Boiler
Pressure Gage
You may also monitor the steam boiler heating progress by watching the Steam Boiler
Pressure Gage. The steam boiler is set at approximately 2.0 Bar of pressure at the factory.
Once the pressure gage reaches this point the heating will stop. When the coffee boiler
reaches operating temperature all lights on the keypad will light. Should you wish to adjust
the pressure of the steam boiler please refer to the Software Programming Guide under the
section “Steam Boiler temperature”.
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Installation Guide
Version 1.02
English
8La Marzocco, S.r.l. Firenze, Italia
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When the espresso machine is ready, place ground coffee into the portafilter and
activate the brewing process. For additional information to operate this espresso
machine please refer the the owners manual or the software programming guide.
When brewing, the coffee boiler pressure should be between 8-10 bar. The steam
boiler pressure should be set at 2 bar but can operate at any setting between 1.3
bar and 2 bar.
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Steam Boiler
Pressure Gage
Coffee Boiler
Pressure Gage
Version 1.02
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