Posted Wed Feb 5, 2014, 11:32am Subject: Bunn es-1a
I have a Bunn es-1a-f and have some questions. It appears to have to much pressure/flow. With very fine grind coffee I am getting a 2oz shot in about 10 sec. I have tamped it as hard as I can but can't seem to slow down the extraction process. The result is very little crema and way under extracted. I have tried several coffees (Lavazza, Starbucks Turkish grind, my own very fine grind) all to no avail. Any ideas?
Posted Wed Feb 5, 2014, 11:39am Subject: Re: Bunn es-1a
Any coffee that's pre-ground will be stale before you get it home and incapable of proper extraction. Unless you have an actual espresso capable grinder (Baratza Virtuoso or better) the odds that your existing grinder can go fine enough for espresso are exceedingly small. What's your grinder?
Posted Wed Feb 5, 2014, 11:45am Subject: Re: Bunn es-1a
Hi, thx for quick reply. I have a Bunn es-1g (cunilla?) 60 mm flat burr grinder. Also would like to find a source for new burrs for it. What I did not say in my post was that I have a second Bunn es-1a and ith the same coffee it pulls a 25 sec 2 oz shot. The es-1a-f is just over the top with pressure /flow.
Posted Wed Feb 5, 2014, 2:39pm Subject: Re: Bunn es-1a-f
I just re-ground some Lavazza in my grinder. It is powder fine but seems to have slowed the time to pull a shot to about 25 sec. It is much finer than I use in my other Bunn es-1a and. Is mush after I pull a shot. What is the OPV valve? I do have the service manual. Thanks again
Posted Wed Feb 5, 2014, 3:45pm Subject: Re: Bunn es-1a-f
OPV would be an over pressure valve that would release a little pressure if the pressure in the system went over a set value (usually, I think, somewhere around 10 bar). I went back and looked at the ES-1a manual and didn't see one in the plumbing schematic (or, at least, nothing that looked like one to my limited experience with hydraulic schematics). So I'm stumped.
Posted Wed Feb 5, 2014, 6:26pm Subject: Re: Bunn es-1a
Thanks. Now that you described it I know where it is and will clean it in some cleaner tomorrow. I grew up in Altadena so know the area pretty well. Brother in La Canada and ex and kids in a Newport Beach still. I will let you know how I do at solving the problem. Next time I am in LA coffee is on me.
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