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Permalink Reply by Brady on December 2, 2009 at 6:50am

Hi Joe.

First thing's first... get your extraction time consistent, preferably around the target time recommended by your roaster for your blend. This may well resolve your problem, and at least will give you a better idea of which direction you need to head.

About 200 degree water is about right, though the devil is in the detail. Your blend will have a target temperature that will make it sing. You'll need a better temp measurement method if you want to know what your temp really is... "about 200" tells you nothing. That said, I'm not sure how well you are going to be able to maintain that target tempanyway, given the way these machines are configured and temps are controlled... more on that in a second.

The manual for your Classe 6 Leva can be found here:
http://www.rancilio.com/rancilio/download_page.jsp?flag=2&id_ca...

From that, it looks like the Leva uses the same mechanical pressurestat as on the S (semi-auto) model. On that machine, you adjust water temperature somewhat indirectly by carefully adjusting boiler pressure up or down. There is an adjustment screw on the top of the pressurestat (inside the machine, on the right hand side) for that. Your boiler water temp will fluctuate quite a bit.

That being said, I am not familiar with the operation of this particular machine, so there may be some other way to change the water temp seen at the group. There is no heat exchanger, it uses boiler water for brewing. I seem to recall there being a purge technique, but don't recall at this point.

Any Lever pros out there?

Sorry for the lack of response initially... I don't know much about this machine and prefer not to jump in unless I have something to add.

(BTW, you could have just bumped this thread back up instead of starting a new one. If there are no replies to it yet, please delete it. Thanks!)

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