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Vibiemme Double Domobar Super (2 boiler + PID), 3-way powerswitch and timer - Page 2

Postby misterdoggy on Mon Jun 08, 2009 3:32 am

If Steam is the issue the Regular Super Domobar with single boiler is the way to go. I made the choice for the single boiler because I drink only latte's and the power shutting off feature was of no interest.

There is more than enough steam, almost too much sometimes as I have to turn it down in my machine :)

Your switch can stay in the ON position as the boiler is already full and there is no risk. I leave mine on all the time.

I have to wonder if its a savings and good for the machine whether or not to leave on all the time. I mean the heating up time compared to the short spurts of keeping up a temperature while left on are probably minimal difference. I also think that the heating and cooling of parts ie: gaskets etc probably have an effect.

I will always opt to leave on all the time...
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Postby Sebastiaan007 on Mon Jun 08, 2009 8:42 am

Sjoerd, you can adjust the boiler pressure of the BIII very easily.
It is the same on all their HX machines, just by turning the pressostat to a higher pressure your get more steampower.
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Postby erics on Mon Jun 08, 2009 9:33 am

There has been some "advancements" in the PID control used with these machines. The Gicar controller fitted to the new Alex Duetto II has the ability to set the pressure (via temperature?) in the steam boiler via the Gicar display, i.e., goodbye pressurestat. See here for some details: http://www.chriscoffee.com/products/hom ... izzoduetto

I do recall someone saying that the PID controller in the first generation Duetto and the B-III were the same or at least very similar. So, it may very well be that (now) the B-III pressurestat has been replaced by an updated Gicar controller and that the ability to change the setting within the controller for the steam boiler has been "locked out" to the end user.
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Postby stefano65 on Mon Jun 08, 2009 10:48 am

We have for my home use the pid double boiler
we have it on a timer
switch is always on position I
that gives power to the brew boiler, all the function including the PID
with an exception of the steam boiler,

ONCE you are already up and the timer warmed up already the brewing
takes only 8 minutes for the steam boiler
so My suggestion is that
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Postby sweaner on Mon Jun 08, 2009 11:08 am

If Sjoerd is having trouble with the 2 hole tip, but does well with the 1 hole tip, would that not indicate too much steam power for his current skill level?
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Postby sjjan on Mon Jun 08, 2009 12:19 pm

Could be the skill level. However, I am a fully qualified SCAE Barista and have no problem getting good microfoam on other machines, even those that have a lot of power. To me the problem seems to be that the 2 hole tip provides too much of an opening that the pressure in the boiler falls and does not stay the same. The first cappuccino would still be OK, but the second one right after would have problems.

Knowing that I can create perfect microfoam on other machines I would think to search for the problem somewhere else.

As to my knowledge, the pressurestat cannot be adjusted and by the OPV to provide not 11 bar but 9 bar of pressure for making the espresso, it seems that the steamboiler pressure is lowered automatically (in the PID controller firmware software or some other way?). The steamboiler pressure sinks down to 0.6-0.8 bar.

With a 1-hole tip (blocking the other), the pressure in the boiler cannot be released as quick, so the BIII can keep up.

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Postby akallio on Mon Jun 08, 2009 3:07 pm

As to my knowledge, the pressurestat cannot be adjusted and by the OPV to provide not 11 bar but 9 bar of pressure for making the espresso, it seems that the steamboiler pressure is lowered automatically (in the PID controller firmware software or some other way?). The steamboiler pressure sinks down to 0.6-0.8 bar.


I didn't quite follow, OPV should not have anything to do with steam pressure. Did you have a look inside the machine? Was there a pressurestat? Maybe they switched to PID'ed steam boiler control like in Duetto, but didn't document how the PID can be programmed to change steam boiler temperature.
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Postby Sebastiaan007 on Mon Jun 08, 2009 4:17 pm

The latest BIII does not have the same PID as the Duetto V2.
I just received both last week and there totally different due to the fact that the Duetto now has no Pressurestat and the BIII has like it always had.

I am getting some 4 hole tips in a week or so for the BIII and others maybe that can help Sjoerd too.
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Postby sjjan on Tue Jun 09, 2009 3:21 am

Of course I opened up the machine. There is no pressurestat inside that can be adjusted. The only adjustment that can be made is the OPV valve, thus lowering the pressure at the brewhead. The pressure in the steam boiler is set automatically by the Brewtus III.

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Postby Sebastiaan007 on Tue Jun 09, 2009 3:19 pm

Sorry but then you haven't looked properly.
They now put tape around the pressurestat to protect it from water from the vacuum valve.

If you look into the machine from the backside it is between the panel of the water container and the steam boiler.
You cannot have no pressurestat, seriously.
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