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PLEASE HELP ! 3way solenoid pre infusion mod concept (gaggia classic)
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Mrparapluie
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Mrparapluie
Joined: 10 Sep 2013
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Location: Quebec
Expertise: I like coffee

Espresso: Gaggia Classic
Grinder: Ascaso iSteel 1 (54 flat...
Posted Thu Jan 16, 2014, 8:45pm
Subject: PLEASE HELP ! 3way solenoid pre infusion mod concept (gaggia classic)
 

Hi!

My friend and i were thinking about a way to do pre-infusion by modding the 3 way valve solenoid (as shown below)

link to mod diagram


link to original diagram


The idea would be that the by opening the brew valve without starting the pump, the pressure coming from the heating boiler would hopefully be enough to pre-infuse the puck. So we would put a ON/OFF switch between the solenoid and the pump to activate the pump independently from the solenoid.

Our only concern is that we wonder if the water would go back in the entry hose or would it go to the grouphead...
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calblacksmith
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calblacksmith
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Espresso: ECM Vene. A1, La Cimbali M32
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Roaster: gave it a try, decided no
Posted Fri Jan 17, 2014, 5:02am
Subject: Re: PLEASE HELP ! 3way solenoid pre infusion mod concept (gaggia classic)
 

Most machines that passively pre infuse use line pressure or around 40 PSI, I don't think you will get enough pressure from the boiler alone. Give i a try though and if you like the results so much the better and if not, you only lost a little time. Oh, BTW, I would not cut holes to mount switches etc until you try it and decide to keep the mod.

 
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dwRK
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Joined: 14 Sep 2013
Posts: 92
Location: Houston
Expertise: Just starting

Posted Fri Jan 17, 2014, 10:57pm
Subject: Re: PLEASE HELP ! 3way solenoid pre infusion mod concept (gaggia classic)
 

there is an internal stand pipe in the boiler where water goes out to the group...

without the pump...say boiler pressure pushes the water out to the puck...pre-infusion yes...but will have created a steam space between top of the boiler and the pipe...

when you restart the pump...not sure what will happen to this space...will the steam gets push out to the puck...or the pressure collapses the space and you get a shockwave slaming the puck?

it will be an interesting experiment to try...

i would also try the following...same concept with an independent solenoid...activate solenoid/start pump for 4~5s to soak the puck...stop pump for preinfusion...start pump for extraction...stop pump/deactivate solenoid to depressure...

i ended up using a light dimmer mod to the pump...manual pressure profiling including preinfusion :) but I must say I seldom use this doing milk drinks...and only on some beans for espresso...
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Mrparapluie
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Mrparapluie
Joined: 10 Sep 2013
Posts: 19
Location: Quebec
Expertise: I like coffee

Espresso: Gaggia Classic
Grinder: Ascaso iSteel 1 (54 flat...
Posted Fri Jan 17, 2014, 11:26pm
Subject: Re: PLEASE HELP ! 3way solenoid pre infusion mod concept (gaggia classic)
 

dwRK Said:

i ended up using a light dimmer mod to the pump...manual pressure profiling including preinfusion :)

Posted January 17, 2014 link

Thank you dwRK !

After reading a tons of topic about the dimer mod, i will choose this one. I will pick a 600w dimer because a lot of people tell the higher is the better to have a perfect control (1bar to 9bar) like this video  

DwRK can you take a picture of the internal of your machine and post it, not sure where the dimer is supposed to be wired. Everything I read about this mod was nice, but i never saw the connection..

It would be nice if you can help me with this one ! My machine is a Gaggia classic by the way ;)

Thank you my friend !
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wcmocha
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wcmocha
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Espresso: Gaggia Classic
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Posted Sat Jan 18, 2014, 11:07pm
Subject: Re: PLEASE HELP ! 3way solenoid pre infusion mod concept (gaggia classic)
 

The dimmer is your best option, though I've never tried it.  My Classic was plumbed in and it took street pressure to get the puck saturated in about 5 seconds.  Ambient pressure from the boiler would not work.  Maybe with steam, but you want to avoid that or you'll get channeling.
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dwRK
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Joined: 14 Sep 2013
Posts: 92
Location: Houston
Expertise: Just starting

Posted Sat Jan 18, 2014, 11:54pm
Subject: Re: PLEASE HELP ! 3way solenoid pre infusion mod concept (gaggia classic)
 

you do realize these are all live wiring...just make sure you know what you are doing...this type of dimmer connection is very rudimentary...by your question i am a bit concerned...

fyi...the dimmer is wired in series to the pump...i've wrapped the connections with electrical tape and the dimmer is insulated from the casing

my dimmer selection...cheapest <$5...the ULKA pumps are mostly <60w so any dimmer should work...

here you go picture of my unit...

just so you know i almost never use this after installation...i only "needed" this on one bean to control the final 3rd...

dwRK: dimmer.jpg
(Click for larger image)
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