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Descaling Bezzera BZ07
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drdreydel
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Joined: 27 Jan 2009
Posts: 81
Location: MA
Expertise: I love coffee

Espresso: Bezzera BZ07
Grinder: Le'Lit Pl53
Posted Thu Sep 13, 2012, 9:53am
Subject: Descaling Bezzera BZ07
 

Hello all,

I recently upgraded from a SBDU (Le'Lit) to the Bezzera BZ07. I love it, but I also realize that preventative maintenance like descaling requires a slightly different procedure on HX machines. I read the instructions in Jim's water thread, but I'm pretty confused by the difference in the procedure for descaling the HX and the boiler. How does one distinguish what's being filled? I realize that this is a very HX newbie question. I thought I understood the general workings, but apparently I don't! So, with choice being the brew button, the hot water wand and the steam wand...which to use for which part of the procedure?

Thanks!

Andrey
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GVDub
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Joined: 25 Jan 2008
Posts: 845
Location: Los Angeles, CA
Expertise: I live coffee

Espresso: Londinium I, Arrarex...
Grinder: Gaggia MD85, Dienes Mokka,...
Drip: Behmor Brazen, Abid Clever
Roaster: Behmor 1600
Posted Thu Sep 13, 2012, 11:01am
Subject: Re: Descaling Bezzera BZ07
 

The brew button will draw water from the reservoir through the heat exchanger to the group head. Both the hot water wand and steam wand draw from the boiler.

So, if you're descaling only the heat exchanger, you want to make sure that the descaling solution doesn't go into the boiler if the autofill kicks on while you're drawing water through the heat exchanger (in which case you might as well shrug your shoulders, mix up some extra descaling solution, and do the whole machine). Which means you'll want to defeat the autofill when descaling the HX itself. This is usually done by grounding the lead that goes to the water probe.
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drdreydel
Senior Member


Joined: 27 Jan 2009
Posts: 81
Location: MA
Expertise: I love coffee

Espresso: Bezzera BZ07
Grinder: Le'Lit Pl53
Posted Thu Sep 13, 2012, 11:10am
Subject: Re: Descaling Bezzera BZ07
 

Ah that makes good sense. Is there any reason why one would necessarily want to descale one but not the other? Thanks!
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GVDub
Senior Member


Joined: 25 Jan 2008
Posts: 845
Location: Los Angeles, CA
Expertise: I live coffee

Espresso: Londinium I, Arrarex...
Grinder: Gaggia MD85, Dienes Mokka,...
Drip: Behmor Brazen, Abid Clever
Roaster: Behmor 1600
Posted Thu Sep 13, 2012, 11:32am
Subject: Re: Descaling Bezzera BZ07
 

drdreydel Said:

Ah that makes good sense. Is there any reason why one would necessarily want to descale one but not the other? Thanks!

Posted September 13, 2012 link

I would say it all depends on how hard your water is. Scale build-up will affect the HX tube much faster than it will the boiler, as it will slow the rate at which the water passing through the tube heats, and decrease it's volume, forcing the pump to work harder to deliver the same volume of water. So, if the water is hard enough to leave scale deposits, I would descale the HX 2-3 times as frequently as I would descale the boiler. Scale sccumulation in the boiler is going to be primarily at the water line, so is nowhere near as quick to affect the operation of the machine.

As some are fond of saying, YMMV, but this is just my take on it.
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drdreydel
Senior Member


Joined: 27 Jan 2009
Posts: 81
Location: MA
Expertise: I love coffee

Espresso: Bezzera BZ07
Grinder: Le'Lit Pl53
Posted Thu Sep 13, 2012, 11:37am
Subject: Re: Descaling Bezzera BZ07
 

Thanks, very helpful!
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dougz
Senior Member


Joined: 23 Oct 2009
Posts: 255
Location: Mackenzie, BC
Expertise: Just starting

Espresso: Bezzera BZ07
Grinder: Lelit PL53
Drip: Technivorm
Posted Fri Apr 5, 2013, 12:15am
Subject: Re: Descaling Bezzera BZ07
 

Sorry, that's confused me..

Can you give me a link to this "Jim's water thread"?

I thought it was as easy as putting the descaling solution in with your water, then alternating between drawing it through your group head, steam wand and water valve, then fill it with fresh water and repeat the procedure a couple times till it runs clear, done - boiler and group head..
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