Re: Pre-infusion & the Silvia
An easy (and cheap) way to test pre-infusion would be to wire a 240V rated normally closed press button switch in series with the pump...... (normal caveats apply - 240V can kill - so only attempt this if you know what you are doing!!)
Press the brew switch - after say 2 seconds press and hold the newly installed switch - the 3 way solenoid will remain operated but the pump will stop - this will provide pre-infusion - after say 5 seconds release the button, the pump will restart and extraction will continue.
An easy (and cheap) way to test pre-infusion would be to wire a 240V rated normally closed press button switch in series with the pump...... (normal caveats apply - 240V can kill - so only attempt this if you know what you are doing!!)
Press the brew switch - after say 2 seconds press and hold the newly installed switch - the 3 way solenoid will remain operated but the pump will stop - this will provide pre-infusion - after say 5 seconds release the button, the pump will restart and extraction will continue.

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