La Marzocco GS/3 Installation Manual - page 9
GS/3
English
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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