Our Valued Sponsor
OpinionsConsumer ReviewsGuides and How TosCoffeeGeek ReviewsResourcesForums
Espresso: Espresso Machines
Giotto Evoluzione boiler pressure gauge weirdness.
Commercial Equipment
Nuova Simonelli, La Marzocco, Rancilio. Nationwide installation. Instant financing options.
www.seattlecoffeegear.com
 
Not Logged in: Log In to Postlog in
New Topics updated topics   New Posts new posts   Unanswered Posts new unanswered  
Search Discussion Board search   Discussion Board FAQ faq   Signup sign up  
Discussions > Espresso > Machines > Giotto...  
view previous topic | view next topic | view all topics
showing page 1 of 2 last page next page
Author Messages
lttlscamp
Senior Member


Joined: 25 Dec 2009
Posts: 57
Location: Toronto
Expertise: I like coffee

Espresso: Rocket Giotto Evoluzione
Grinder: Baratza Vario
Posted Sat Aug 4, 2012, 3:31pm
Subject: Giotto Evoluzione boiler pressure gauge weirdness.
 

Hey everyone,

Have a little mystery that I'm hoping someone can help me solve

I plumbed in my Evoluzione recently and am experiencing some weid behavior with the boiler pressure gauge.  I let it come up to pressure and into the green zone between 1.1 and 1.5 bar. As soon as I flip the brew lever the pump kicks in and the pressure gauge starts climbing rapidly for some reason. It'll actually peg itself if I let it.

This doesn't happen every time I brew.  It stopped doing it for a while but started again today.

Not sure if I've done something wrong (how can you get flipping a switch wrong?) but any hints would be appreciated.
back to top
 View Profile Link to this post
calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 7,947
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Mon Aug 6, 2012, 7:43am
Subject: Re: Giotto Evoluzione boiler pressure gauge weirdness.
 

Your issue sounds a lot like another machine we had recently, except for the intermittent part.
There are one or two gauges on a machine depending on how the manufacturer made it.

The first one is the static boiler pressure, what it really is measuring is the temp of the boiler, this is the gauge that typically reads from 1 to 1.5 bar, this reading of pressure is a reflection of the temp in the boiler, the hotter the boiler, the higher this gauge will read.

There is sometimes a second gauge, this gauge reads the brew pressure and it normally reads line pressure at idle then when brewing it shows the pressure of the water in the brew system. This gauge reads about 8 bar or so when brewing but at idle it will show line pressure, if the machine is plumbed in, it will read what the water pressure in the home is, about 2 bar give or take, in a water tank operated machine, this will be zero.

Your temp gauge is rapidly climbing only when you start the brew cycle, this indicates that there may be a leak between the HX tube and the boiler, it may be a cracked HX tube or some other leak between the HX tube and the boiler. The brew pressure may be pressurizing the boiler thus causing the temp gauge to climb.

The only other thing that can cause the temp gauge to climb is that the heater is not turning off or it is turning on somehow when you start brewing, this would also cause the temp gauge to climb and either case, if the pressure rises high enough, they will trigger the safety valve and the boiler will bleed pressure and a large cloud of steam.

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
back to top
 View Profile Visit website Link to this post
lttlscamp
Senior Member


Joined: 25 Dec 2009
Posts: 57
Location: Toronto
Expertise: I like coffee

Espresso: Rocket Giotto Evoluzione
Grinder: Baratza Vario
Posted Mon Aug 6, 2012, 2:38pm
Subject: Re: Giotto Evoluzione boiler pressure gauge weirdness.
 

I don't get any steam during brewing so maybe it's s leak.

I haven't put a pressure regulator in yet. Could it be related to that at all?   I won't be using it again now until I get one installed.
back to top
 View Profile Link to this post
dsblv
Senior Member


Joined: 2 Dec 2006
Posts: 191
Location: Bellevue, WA
Expertise: I like coffee

Espresso: Rocket Giotto Evoluzione
Grinder: MACAP MC4
Posted Tue Aug 7, 2012, 5:45am
Subject: Re: Giotto Evoluzione boiler pressure gauge weirdness.
 

I'd recommend switching to the Evo's internal tank to see if everything runs normally in that mode.  If it does, then you'll know the problem is related to your plumbing installation.
back to top
 View Profile Link to this post
JohnBarton1369
Senior Member


Joined: 6 Apr 2011
Posts: 48
Location: Southern FLorida
Expertise: I like coffee

Espresso: Giotto
Grinder: Precisio, MACAP M4
Drip: Manual Filter Holder (Pour...
Posted Wed Aug 8, 2012, 7:58am
Subject: Re: Giotto Evoluzione boiler pressure gauge weirdness.
 

Not to hijack, but I also have a recent anomoly in my Giotto (two gauges).   I noticed it after a period of several months of inactivity (the Giotto is in a seasonal home.)  When the machine is rock cold the right guage (line/brew pressure) is normal, at or near zero (I do not have it plumbed in but run it from a water jug.)  The left guage (boiler pressure/temp) is at .5 bar, never going below that, even with the machine not plugged into the power mains.   When I turn it on to warm up for use, the needle goes to about 2.5 bar.  The fact that it does not drop below .5 bar when cold wouild lead me to the conclusion that it is probably a bad gauge, but my experience level with thee machines is very low, so I hesitate to jump to even an obvious conclusion without some experienced validation.

In spite of the gauge anomoly the machine still makes good espresso, no pressure release valve goes off, etc.

thx,

john
back to top
 View Profile Link to this post
calblacksmith
Moderator
calblacksmith
Joined: 25 Nov 2007
Posts: 7,947
Location: Riverside, Ca, U.S.A.
Expertise: I live coffee

Espresso: ECM Vene. A1, La Cimbali M32
Grinder: Azkoyen Capriccio, Major
Vac Pot: 40s era Silex
Drip: Msl. Com. brewers
Roaster: gave it a try, decided no
Posted Wed Aug 8, 2012, 8:12am
Subject: Re: Giotto Evoluzione boiler pressure gauge weirdness.
 

the gauges are fairly easily damaged, sometimes just due to age. If it does not zero, when it should then it is off by at least as much as the zero error and it can be more when in use.

Ya, your instinct was right, it sounds like a bad gauge.

 
In real life, my name is
Wayne P.
Anything I post is personal opinion and is only worth as much as anyone else's personal opinion. YMMV!

Feed the newbs, starve the trolls and above all enjoy what you drink!
back to top
 View Profile Visit website Link to this post
dsblv
Senior Member


Joined: 2 Dec 2006
Posts: 191
Location: Bellevue, WA
Expertise: I like coffee

Espresso: Rocket Giotto Evoluzione
Grinder: MACAP MC4
Posted Wed Aug 8, 2012, 9:19am
Subject: Re: Giotto Evoluzione boiler pressure gauge weirdness.
 

JohnBarton1369 Said:

..... The left guage (boiler pressure/temp) is at .5 bar, never going below that, even with the machine not plugged into the power mains.   When I turn it on to warm up for use, the needle goes to about 2.5 bar.  The fact that it does not drop below .5 bar when cold wouild lead me to the conclusion that it is probably a bad gauge, but my experience level with thee machines is very low, so I hesitate to jump to even an obvious conclusion without some experienced validation.

In spite of the gauge anomoly the machine still makes good espresso, no pressure release valve goes off, etc.

thx,

john

Posted August 8, 2012 link


The gauge issue could also be caused by a stuck vacuum pressure valve.  When the machine is off and cold, try opening the steam wand.  Does the boiler pressure fall to zero?  If so, then the vacuum pressure valve is stuck closed.
back to top
 View Profile Link to this post
JohnBarton1369
Senior Member


Joined: 6 Apr 2011
Posts: 48
Location: Southern FLorida
Expertise: I like coffee

Espresso: Giotto
Grinder: Precisio, MACAP M4
Drip: Manual Filter Holder (Pour...
Posted Wed Aug 8, 2012, 10:38am
Subject: Re: Giotto Evoluzione boiler pressure gauge weirdness.
 

dsblv Said:

The gauge issue could also be caused by a stuck vacuum pressure valve.  When the machine is off and cold, try opening the steam wand.  Does the boiler pressure fall to zero?  If so, then the vacuum pressure valve is stuck closed.

Posted August 8, 2012 link

Good thought; just tried it (opening the steam wand), nary a difference...

So I have a bad gauge then.  I guess I can still operate the machine until I get it fixed.

john
back to top
 View Profile Link to this post
lttlscamp
Senior Member


Joined: 25 Dec 2009
Posts: 57
Location: Toronto
Expertise: I like coffee

Espresso: Rocket Giotto Evoluzione
Grinder: Baratza Vario
Posted Wed Aug 8, 2012, 3:17pm
Subject: Re: Giotto Evoluzione boiler pressure gauge weirdness.
 

Everything works fine off the tank so I'm suspecting a pressure problem.  Have a regulator on the way so I'll know for sure soon enough.
back to top
 View Profile Link to this post
lttlscamp
Senior Member


Joined: 25 Dec 2009
Posts: 57
Location: Toronto
Expertise: I like coffee

Espresso: Rocket Giotto Evoluzione
Grinder: Baratza Vario
Posted Fri Aug 10, 2012, 6:40am
Subject: Re: Giotto Evoluzione boiler pressure gauge weirdness.
 

Well, I got the regulator all hooked up but new problem!  For some reason the vacuum breaker on the boiler is spitting out water now as it comes up to pressure! And it's not around the threads but right out the top.

Seems that it's not closing  like it should be?

Ok, after a bit more reading it sounds like this can be caused if the boiler is overfilling.  That can happen because the water pressure is too high (if your machine is plumbed in like mine).  That seems strange considering the pressure regulator is set to around 30 PSI (2 Bar) which is well within the recommendation for the intake pressure of the machine when plumbed in.

And this wasn't happening before the regulator was in place and you'd think the pressure was probably higher then.
back to top
 View Profile Link to this post
showing page 1 of 2 last page next page
view previous topic | view next topic | view all topics
Discussions > Espresso > Machines > Giotto...  
New Topics updated topics   New Posts new posts   Unanswered Posts new unanswered     Search Discussion Board search   Discussion Board FAQ faq   Signup sign up  
Not Logged in: Log In to Postlog in
Discussions Quick Jump:
Symbols: New Posts= New Posts since your last visit      No New Posts= No New Posts since last visit     Go to most recent post= Newest post
Forum Rules:
No profanity, illegal acts or personal attacks will be tolerated in these discussion boards.
No commercial posting of any nature will be tolerated; only private sales by private individuals, in the "Buy and Sell" forum.
No SEO style postings will be tolerated. SEO related posts will result in immediate ban from CoffeeGeek.
No cross posting allowed - do not post your topic to more than one forum, nor repost a topic to the same forum.
Who Can Read The Forum? Anyone can read posts in these discussion boards.
Who Can Post New Topics? Any registered CoffeeGeek member can post new topics.
Who Can Post Replies? Any registered CoffeeGeek member can post replies.
Can Photos be posted? Anyone can post photos in their new topics or replies.
Who can change or delete posts? Any CoffeeGeek member can edit their own posts. Only moderators can delete posts.
Probationary Period: If you are a new signup for CoffeeGeek, you cannot promote, endorse, criticise or otherwise post an unsolicited endorsement for any company, product or service in your first five postings.
Rocket R58 Double Boiler
Rocket Espresso R58 Double Boiler -  Everything you need for the perfect shot!
www.seattlecoffeegear.com
Home | Opinions | Consumer Reviews | Guides & How Tos | CoffeeGeek Reviews | Resources | Forums | Contact Us
CoffeeGeek.com, CoffeeGeek, and Coffee Geek, along with all associated content & images are copyright ©2000-2014 by Mark Prince, all rights reserved, unless otherwise indicated. Content, code, and images may not be reused without permission. Usage of this website signifies agreement with our Terms and Conditions. (0.516824007034)
Privacy Policy | Copyright Info | Terms and Conditions | CoffeeGeek Advertisers | RSS | Find us on Google+