Steam Boiler; Coffee Boiler; Pressure Gauge - La Marzocco GS/3 Owner's Manual

Steam Boiler

Pressure Gauge

Next it will be necessary to check the expansion valve. As the coffee boiler heats to operating temperature the
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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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Coffee Boiler

Pressure Gauge