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Got my Giotto Evo! Love it so far, but unsure about one thing:
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Discussions > Espresso > Machines > Got my Giotto...  
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Inflictionmitch
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Joined: 30 Oct 2011
Posts: 27
Location: Montreal
Expertise: I love coffee

Espresso: La Pavoni Pisa
Posted Thu Oct 31, 2013, 12:42pm
Subject: Got my Giotto Evo! Love it so far, but unsure about one thing:
 

Thanks in large part to this wonderful board, I've pulled the trigger on a Rocket Giotto Evo v2, which was delivered yesterday afternoon. I'm loving it so far, in a huge way, but I've got a question related to the boiler gauge. For some reason, even after an hour of warmup, the boiler pressure only reaches the very edge of being 1 Bar, and often hovers a click or two below that measurement, before rising back to being just at the edge of the 1 Bar reading. Attaching a pic to illustrate. This is the highest the boiler reaches. Is it out of calibration, or is this normal?

Inflictionmitch: Rocket guage small.JPG
(Click for larger image)
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Inflictionmitch
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Joined: 30 Oct 2011
Posts: 27
Location: Montreal
Expertise: I love coffee

Espresso: La Pavoni Pisa
Posted Thu Oct 31, 2013, 12:43pm
Subject: Re: Got my Giotto Evo! Love it so far, but unsure about one thing:
 

No idea why the image is appearing upside-down here. Sorry about that!
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Burner0000
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Joined: 28 Jul 2011
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Location: Cambridge, Ontario Canada
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Espresso: Rancilio Silvia, VFA Expres...
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Roaster: Behmor 1600 / Sonofresco
Posted Thu Oct 31, 2013, 1:39pm
Subject: Re: Got my Giotto Evo! Love it so far, but unsure about one thing:
 

To my knowledge that is the water pressure at the pump if were talking about a plumbed machine.  The other gauge on your machine should read boiler/brew pressure.  Usually you don't want more than 2 bars coming from the water in the house or so I've been told.
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Markarian
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Markarian
Joined: 27 Jun 2012
Posts: 652
Location: Seattle Area
Expertise: I love coffee

Espresso: ECM Technika IV Profi WT-WC
Grinder: Baratza Forte AP, HG One
Vac Pot: Bunn Trifecta MB
Drip: Moka, Aeropress, Hario V60
Roaster: Behmor 1600
Posted Thu Oct 31, 2013, 1:59pm
Subject: Re: Got my Giotto Evo! Love it so far, but unsure about one thing:
 

No, that is the correct gauge for boiler pressure. Burner, the pump pressure gauge should read between 1-16 bar and the boiler pressure gauge  between 1-3. Ideal boiler pressure is somewhere around 1.25 bar. The Evo should have an adjustable pressurestat inside that can be tweaked until you get a higher boiler pressure. I would not advise going above 1.5. 1.2-1.3 is going to be a good sweet spot. I would first contact the place you purchased it from and ask them to be sure, but your machine is very similar to mine and mine was calibrated at the factory to where the PSTAT ticks off at exactly 1.25 bar.
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ohills
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Joined: 14 Mar 2012
Posts: 16
Location: oceanside,ca
Expertise: Just starting

Espresso: Rocket Giotto Evoluzione V2
Grinder: Vario
Posted Thu Oct 31, 2013, 2:51pm
Subject: Re: Got my Giotto Evo! Love it so far, but unsure about one thing:
 

I have the same Giotto and my gauge is set at 1.0 when it reaches temp
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dsblv
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Joined: 2 Dec 2006
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Location: Bellevue, WA
Expertise: I like coffee

Espresso: Rocket Giotto Evoluzione
Grinder: MACAP MC4
Posted Thu Oct 31, 2013, 2:53pm
Subject: Re: Got my Giotto Evo! Love it so far, but unsure about one thing:
 

Your boiler pressure is normal.  Rocket typically sets the boiler pressure to vary between .9 to 1.1 bar, with an average of 1 bar.  Rocket does this to produce a "tamer" machine that doesn't run too hot at the group head.

I did adjust the pressurestat on my Evo to vary between 1 to 1.2 bar, with an average of 1.1 bar.  I wanted slightly higher brew temperatures and it helped improve the brew recovery time.
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Iluvdabean
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Iluvdabean
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Posted Thu Oct 31, 2013, 2:56pm
Subject: Re: Got my Giotto Evo! Love it so far, but unsure about one thing:
 

No Worries.

Inflictionmitch Said:

No idea why the image is appearing upside-down here. Sorry about that!

Posted October 31, 2013 link



Iluvdabean: Screen Shot 2013-10-31 at 5.54.22 PM.jpg
(Click for larger image)
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uscfroadie
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uscfroadie
Joined: 2 Aug 2008
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Location: San Antonio
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Espresso: Olympia Cremina, Breville...
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Roaster: Behmor
Posted Thu Oct 31, 2013, 4:04pm
Subject: Re: Got my Giotto Evo! Love it so far, but unsure about one thing:
 

dsblv already covered this, but let me add to it.

A 1.0 boiler pressure is neither good or bad; it's just a reading, and you are well within normal limits.  A lower boiler pressure means you'll have a lower flush than you would if you raised the pressure on that particular machine.  The downside of having it too low is a slow recovery between shots and slower steaming.  Some people adjust for a higher pressure to get better steaming performance, but the downside is that you have a longer cooling flush.  According to what other Rocket owners are saying. Rocket feels the best compromise for your machine is an average 1.0 bar of pressure, with a .2 dead band (variance between the pstat tripping on/off; .9 - 1.1).

How many ounces do you need to flush to get rid of the flash boiling?
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Inflictionmitch
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Joined: 30 Oct 2011
Posts: 27
Location: Montreal
Expertise: I love coffee

Espresso: La Pavoni Pisa
Posted Thu Oct 31, 2013, 8:43pm
Subject: Re: Got my Giotto Evo! Love it so far, but unsure about one thing:
 

Cool. Thanks a bunch, everyone. Good to know that my machine's not acting abnormally. I'm really loving this beast!
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Markarian
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Markarian
Joined: 27 Jun 2012
Posts: 652
Location: Seattle Area
Expertise: I love coffee

Espresso: ECM Technika IV Profi WT-WC
Grinder: Baratza Forte AP, HG One
Vac Pot: Bunn Trifecta MB
Drip: Moka, Aeropress, Hario V60
Roaster: Behmor 1600
Posted Thu Oct 31, 2013, 11:44pm
Subject: Re: Got my Giotto Evo! Love it so far, but unsure about one thing:
 

Also, thanks for the tips, guys! I kept forgetting about that myself. And yeah, let me just add...if it ain't broke, don't try and fix it. If it makes good espresso and decent microfoam then you're all set.
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