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Yet another HX flush question
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Discussions > Espresso > Machines > Yet another HX...  
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HB
Senior Member


Joined: 3 Apr 2003
Posts: 2,913
Location: Cary, NC
Posted Sat Jul 23, 2005, 4:15am
Subject: Re: Yet another HX flush question
 

The HX Love article describes a simplified flushing routine. The paragraph you cite could more succinctly say "The flush amount depends on how long the machine has been idle." The thread  "Fine Tuning Brew Temperature on a Heat Exchanger Machine - A Workable Solution" covers this in excrutiating detail with volume per minutes idle (Abe Carmeli, Bob Yellin and others have developed charts for repeatable temperature accuracy within a degree).

That said, I think the HX Love article is due for an update to better explain the "pro method" versus the "water dance" method, plus introduce innovative modifications that further simplify the routine (as Dave / cannonfodder describes in "Max GH temp on a E61 HX machine?").

-- Dan

 
www.home-barista.com
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hifi_guy
Senior Member
hifi_guy
Joined: 4 Apr 2004
Posts: 268
Location: Germany
Expertise: I love coffee

Espresso: Simonelli Oscar & Personal V
Grinder: Simonelli MDE, Mazzer Kony...
Vac Pot: none
Drip: Melitta Cone, now unused
Posted Sat Jul 23, 2005, 4:33am
Subject: Re: Yet another HX flush question
 

Just speculating here:
There may be differences depending on the heat transfer rate through the HX walls. If this is limited, say, by scale deposits on the outer and / or inner HX wall, Water temperature will drop if you over-flush.
Actually, I suspect something along these lines to be the case with my Simonelli.  The other extreme would be a brand new machine with a mirror-clean HX where you would have to go to very low boiler pressures initially (Scott's Atlas comes to mind).
Right now, I flush 5-6 oz right before locking the PF. I heat the cup with the flush. emptying the cup and wiping cup and group dry before locking the PF takes about 10 sec.

Bernhard
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Ozark_61
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Ozark_61
Joined: 18 Dec 2004
Posts: 428
Location: Springfield, MO
Expertise: I love coffee

Espresso: ECM Giotto
Grinder: Mazzer SJ
Roaster: Behmor 1600, SC/TO, Poppery...
Posted Sat Jul 23, 2005, 11:30am
Subject: Re: Yet another HX flush question
 

Oh no - that's ok, really Dan. I already read past that part where you told 'me' to stop here (I am that kind of keep it simple person... for the most part)!  I was just confused with that one part of overflushing.  Any more details and I'll be drinking a few too many cafe correctos.. ;-)

Thanks for your article!
Geoff

HB Said:

The HX Love article describes a simplified flushing routine....

...That said, I think the HX Love article is due for an update to better explain the "pro method" versus the "water dance"... -- Dan

Posted July 23, 2005 link

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e61brewski
Senior Member
e61brewski
Joined: 7 Dec 2004
Posts: 131
Location: greenville, sc
Expertise: I live coffee

Espresso: isomac tea, riviera lever
Grinder: mazzer major, isomac gran...
Vac Pot: dirt devil lx
Drip: wouldn't dare
Roaster: i-roast
Posted Sat Jul 23, 2005, 8:08pm
Subject: Re: Yet another HX flush question
 

mattyj Said:

In the Grimac Mia review, Malachi mentions the 'professional' version of the cooling flush, done just before pulling a shot, rather than before the dose, distribute, tamp.

Does anyone else do it this way?

Posted July 22, 2005 link

yep. video here:
Click Here (ben.szobody.com)

it took a very sensitive yirgacheffe to show me the flaws of the flush/rebound method. like tiger and his swing, it took awhile for me to effectually switch my habits. but the flush-and-lock is now my favored method by far. and for the first time, i'm consistently nailing finicky beans and blends. one might even dare to use the word "clarity." or not...

 
the blog: http://ben.szobody.com
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mattyj
Senior Member
mattyj
Joined: 5 Apr 2004
Posts: 1,092
Location: Sydney
Expertise: I love coffee

Espresso: Expobar Office Pulser
Grinder: Mazzer Mini
Vac Pot: Hario Mocha 3 Cup ... broken...
Posted Sun Jul 24, 2005, 5:01am
Subject: Re: Yet another HX flush question
 

Wow, thanks guys!

This has been so informative for me! My new expobar arrives on the 10th of August ... it's circled on my calendar, with the title, 'e-day' ... it may seem a tad silly to you, but for me, this is my first good machine, replacing my little (almost) clapped out sunbeam thermoblock.

Dan and Chris, I wanted to thank you guys in particular - in preparation for the new arrival, I've read so much of your stuff, and learnt heaps ... thanks!
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