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The La Marzocco GS/3 Owners' Thread
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Discussions > Espresso > Machines > The La Marzocco...  
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Craigo87
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Posted Wed Dec 1, 2010, 1:40pm
Subject: Re: The La Marzocco GS/3 Owners' Thread
 

JonR10 Said:

That might be me, although I am not the only fellow from Texas using this type of system  ;-)  

I'm using a Flojet water pump that draws water from standard 5-gallon bottles that feeds through a Shurflo accumulator (the type for RV's and boats).  From the Accumulator I go through a 5-micron filter (belt-and-suspenders) and then to the machine inlet.  All the plumbing was done using watts (John Guest) plastic push-in compression fittings and 3/8" plastic tubing (all available at Home Depot).

My newest setp has the pump, accumulator and filter all mounted to a board with ball valves between each element to allow me to isolate any item for repair or replacement.  IOpening a line pressurized with an accumulator can get messy  ;-)  


I've been looking for a picture, but I can't find one....so I guess I'll have to take some new pics.  
Email me if you'd like full-rez images showing fittings and plumbing etc. OK?

Posted December 1, 2010 link

Hi Jon,

I sent you an email requesting the new pics that you offered. I forgot to add that I'd appreciate model numbers for the Flojet pump, Shurflo accumulator and filter as well. I did a search on Flojet pump and although I found one that appears to do the trick (ITT Flojet 4406 series click here) one feature is that it eliminates the need for an accumulator tank, so it must be different than yours. If you think there are other options that might be better, that info would be appreciated as well. I have space below the bar in a 30" wide cabinet, although I'll probably have to use a 3 gal. low-wide jug due to hight restrictions. I'm assuming these pumps are pressure adjustable so that I can dial in 3 bars, correct?

Thanks for your help,
Craigo
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JonR10
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JonR10
Joined: 26 Apr 2004
Posts: 10,376
Location: Houston, Texas
Expertise: I love coffee

Espresso: E61 Legend, Livietta,...
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Posted Wed Dec 1, 2010, 3:54pm
Subject: Re: The La Marzocco GS/3 Owners' Thread
 

Craigo87 Said:

Hi Jon,

I sent you an email requesting the new pics that you offered.

Posted December 1, 2010 link

Hmmm....I didn't see your message.  I'm JonR10-at-yahoo.com


Craigo87 Said:

I forgot to add that I'd appreciate model numbers for the Flojet pump, Shurflo accumulator and filter as well.

Posted December 1, 2010 link

The flojet I use is set up to draw from the bottles already and the inlet tube may be over 30" (I can measure when I get home).  Here is a link to the one I purchased CLICK HERE.  It does not allow for adjusting the line pressure, but operates at a preset value.  

And here is the Shurflo accumulator I used CLICK HERE

Please retry the email and I will forward some pics when I get home, OK?

Cheers,
Jon

 
Jon Rosenthal
Houston, TX
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Craigo87
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Joined: 30 Nov 2010
Posts: 26
Location: Pacific Northwest
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Posted Thu Dec 2, 2010, 1:27am
Subject: Re: The La Marzocco GS/3 Owners' Thread
 

Jon,
I'm curious about the pre-infusion pressure you get with the Flojet system. I read the specs on the Flojet and it shows 30psi operating and 40psi max. That seems low if one is trying to pre-infuse at 3bar.  At what pressure do you have your Shurflo accumulator set?

I've looked at each of the components in your chain for the system and I believe I've got a handle on the hookups. This is definitely the way I want to proceed with providing quality water to the machine.

btw, did you receive my email yet? I had to resend it as I had your email address wrong the first time.

Thank you,
Craigo
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networkcrasher
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networkcrasher
Joined: 7 Jan 2008
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Location: Atlanta
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Posted Thu Dec 2, 2010, 7:53am
Subject: Re: The La Marzocco GS/3 Owners' Thread
 

I may be wrong, but I'm pretty sure Jon has a volumetric GS/3, which uses its pump for preinfusion pressure.
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JonR10
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JonR10
Joined: 26 Apr 2004
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Location: Houston, Texas
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Espresso: E61 Legend, Livietta,...
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Posted Thu Dec 2, 2010, 8:34am
Subject: Re: The La Marzocco GS/3 Owners' Thread
 

networkcrasher Said:

I may be wrong, but I'm pretty sure Jon has a volumetric GS/3, which uses its pump for preinfusion pressure.

Posted December 2, 2010 link

You are correct, I do not have a paddle group so there is no line preinfusion (it is pump-fed).  And also, I have the preinfusion volume set to only wet the puck so there is no appreciable pressure buildup during preinfusion.

 
Jon Rosenthal
Houston, TX
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Craigo87
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Posted Thu Dec 2, 2010, 9:50am
Subject: Re: The La Marzocco GS/3 Owners' Thread
 

JonR10 Said:

You are correct, I do not have a paddle group so there is no line preinfusion (it is pump-fed).  And also, I have the preinfusion volume set to only wet the puck so there is no appreciable pressure buildup during preinfusion.

Posted December 2, 2010 link

Hmmm. So what is your preinfusion pressure and do you feel it wets the puck thoroughly before you go to pump pressure? I've got a call in to Roger at LM, so I'll let you know what he says about the Flojet BW1000 and the paddle group preinfusion. Is there anybody else out there using this setup with the paddle???

Perhaps my question should be, what kind of line pressure are people using with GS/3 paddle versions? I'd imagine most people are using in-line pressure reducers off the plumbed line.
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JonR10
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JonR10
Joined: 26 Apr 2004
Posts: 10,376
Location: Houston, Texas
Expertise: I love coffee

Espresso: E61 Legend, Livietta,...
Grinder: Robur, B-Vario-W
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Drip: Technivorm
Roaster: 1-lb US Roaster, Behmor 1600
Posted Thu Dec 2, 2010, 3:10pm
Subject: Re: The La Marzocco GS/3 Owners' Thread
 

Craigo87 Said:

Hmmm. So what is your preinfusion pressure and do you feel it wets the puck thoroughly before you go to pump pressure?

Posted December 2, 2010 link

Again - I'm not building any pressure during preinfusion.  The way I define it, my preinfusion pressure is zero.  My machine is set to pump a small amount of water into the brewing chamber and then pause for a second or two, and then resume pumping water until I stop it (or it reaches 2 ounces or 50 seconds, whatever comes first)

The theory has been argued in the past, but I still think that the puck surface only sees atmospheric pressure (zero gauge pressure) until the headspace (space between puck surface and group screen) is filled with water and then the pressure will rise as more water is fed iinto the brew chamber.  

My preinfusion is setup to only wet the surface of the puck, and when I did some experimenting I saw that I was only getting the puck wet less than 1/2-way through the thickness (the bottom stays dry).  In order to fully saturate the puck during preinfusion you will need to apply some pressure, but I don't know how much will be sufficient to saturate the puck in your desired time

On my machine, the pump runs to preinfuse, then it pauses (for a programmed period) and then the pump resumes again until the shot is stopped.  So I personally do not want to build any pressure and fully saturate the puck because I feel like stopping and starting the pump could have negative effects on the pressurized puck.

A paddle group is able to feed line pressure into the brew chamber without running the pump, and then engage the pump to increace the pressure to complete the shot.  My machine does not have this capability.  

Amazingly, my shots often seem to come out OK, but I'm sure they could be better  ;-)

 
Jon Rosenthal
Houston, TX
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Craigo87
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Joined: 30 Nov 2010
Posts: 26
Location: Pacific Northwest
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Espresso: Rocket Giotto Evoluzione,...
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Drip: Starbuck's Barista Aroma
Posted Thu Dec 2, 2010, 6:43pm
Subject: Re: The La Marzocco GS/3 Owners' Thread
 

Thanks again Jon for the input.

I spoke with Roger today from LM about this issue and he said that I'd need at least between 40psi to 60psi to take advantage of the paddle group pre-infusion of the GS/3. Armed with that bit of info, I was able to find a pump that will do the job. It is a Flojet model 02100953G. He recommended that I include an accumulator in the link and I told him that was already in the plan, thanks to you.
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Panchoy
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Panchoy
Joined: 4 Dec 2010
Posts: 4
Location: U.S.A.
Expertise: I love coffee

Espresso: La Marzocco GS/3
Posted Sat Dec 4, 2010, 10:14pm
Subject: Re: The La Marzocco GS/3 Owners' Thread
 

Dear GS/3 gurus,

I have looked everywhere and I can't find any information regarding the meaning of the two display elements highlighted by the red square in the photo.

Any clues?

Thanks.

Panchoy: GS3_Disp.jpg
(Click for larger image)
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JonR10
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JonR10
Joined: 26 Apr 2004
Posts: 10,376
Location: Houston, Texas
Expertise: I love coffee

Espresso: E61 Legend, Livietta,...
Grinder: Robur, B-Vario-W
Vac Pot: Hario Tabletop, Yama...
Drip: Technivorm
Roaster: 1-lb US Roaster, Behmor 1600
Posted Sun Dec 5, 2010, 7:30am
Subject: Re: The La Marzocco GS/3 Owners' Thread
 

Panchoy Said:

Any clues?

Posted December 4, 2010 link

I believe that those are used as heating element indicators

 
Jon Rosenthal
Houston, TX
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