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vibiemme domobar temperature problems
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andrewf007
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Joined: 5 Mar 2013
Posts: 3
Location: montreal
Expertise: I love coffee

Posted Tue Mar 5, 2013, 9:50am
Subject: vibiemme domobar temperature problems
 

I recently upgraded from my Silvia to an older Vibiemme Domobar e61 single boiler machine. I'm finding the temperature of my shots too cool. The shots are flavourful and full of crema but are way too cool. Without measuring the temp I've drunk enough coffee in my life to know that the espresso is below the normal range.
I backflushed and descaled the machine, no change. I changed the thermostat for a 100c (the old one was 95c) no change. I think the heating element is ok because when I first put the machine back together I reversed the themostats and got steam in the coffee setting. What else can I do?
Should I descale again and let the dezcal sit in the boiler for a couple hours or more (I did it for a half an hour as directed)?
I'm at a loss here. cheers
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DavecUK
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Joined: 21 Sep 2005
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Location: UK
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Posted Tue Mar 5, 2013, 11:19am
Subject: Re: vibiemme domobar temperature problems
 

andrewf007 Said:

I recently upgraded from my Silvia to an older Vibiemme Domobar e61 single boiler machine. I'm finding the temperature of my shots too cool. The shots are flavourful and full of crema but are way too cool. Without measuring the temp I've drunk enough coffee in my life to know that the espresso is below the normal range.

I backflushed and descaled the machine, no change. I changed the thermostat for a 100c (the old one was 95c) no change.

Posted March 5, 2013 link

Hopefully the last sentence is your problem. You don't detail the exact machine, so I am assuming it's a non HX single boiler machine similar to an Isomac Zaffiro? If it is, then 95C would not be hot enough in the brew boiler to give you the right temperature at the group. It sounds like the temperature is fixed, the original Isomac Zaffiro had a variable temperature stat, but it was difficult to adjust and the mecury bulb thermostat was quite innacurate. If it is fixed then you need to use a thermostat of 103-104C for a decent all round espresso range....personally I would go for a 103C stat. This will give you around 93C at the group. Just make sure it's a very good quality stat.

The reason for this is because of the 10C offset between the boiler and the group as the water cools.

Now if you cannot get a stat of the right value and I suspect you might not be able to.....you could convert to a PID.

Dave
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andrewf007
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Joined: 5 Mar 2013
Posts: 3
Location: montreal
Expertise: I love coffee

Posted Tue Mar 5, 2013, 12:10pm
Subject: Re: vibiemme domobar temperature problems
 

Thanks Dave....the machine is indeed a non hx machine....you may be right - I may need an even hotter thermostat but I'm still confused as to how a 5c boost gives no appreciable increase at the group.....do you know anything about descaling - can I leave the dezcal liquid in for hours as some have suggested?
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frcn
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frcn
Joined: 23 Dec 2001
Posts: 3,404
Location: Northern California
Expertise: Professional

Espresso: Vibiemme Domobar Double
Grinder: Mazzer Kony, Baratza...
Vac Pot: Hario, 2 Cory pots, 1 Cory...
Drip: Behmor Brazen, Bunn A10 mod...
Roaster: computer controlled Hottop,...
Posted Tue Mar 5, 2013, 12:29pm
Subject: Re: vibiemme domobar temperature problems
 

The massive E-61 group takes a good 20-30 minutes to warm up (45  is better). Are you allowing it to idle sufficiently to do so?

 
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andrewf007
Senior Member


Joined: 5 Mar 2013
Posts: 3
Location: montreal
Expertise: I love coffee

Posted Tue Mar 5, 2013, 1:12pm
Subject: Re: vibiemme domobar temperature problems
 

ya it`s on a timer set an hour before I get up.....
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DavecUK
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Joined: 21 Sep 2005
Posts: 1,416
Location: UK
Expertise: I love coffee

Posted Tue Mar 5, 2013, 2:50pm
Subject: Re: vibiemme domobar temperature problems
 

andrewf007 Said:

Thanks Dave....the machine is indeed a non hx machine....you may be right - I may need an even hotter thermostat but I'm still confused as to how a 5c boost gives no appreciable increase at the group.....do you know anything about descaling - can I leave the dezcal liquid in for hours as some have suggested?

Posted March 5, 2013 link

It will work fine, just try it. I personally see every descale as a little death....so the minimum possible, a light touch so to speak. Even better use water that won't scale. In fact I advocate NOT scaling every last piece of limescale off of a boiler, far better to descale enough to stop it building up, but not trying a "bare metal" descale.

Dave
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