Question about La Marzocco Linea Group 1 Espresso Machine
The only thing the expansion valve does is open when the pressure gets to 12 bars when the coffee boiler is heating or when you are backwashing the groups. If you need to adjust wait until red light comes on to say coffee boiler is heating then if gauge is going beyond 12 bars turn end of expansion valve to left to keep it at 12 or right to take it to 12 if it is lower, before doing this make sure pump is set to 9 bars.
Posted on Sep 23, 2010
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Posted on Jan 02, 2017
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