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My Appia modding thread (was Automation of HX cooling flush?)
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Discussions > Espresso > Espresso Mods > My Appia modding...  
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ddubick
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Location: Calgary, Alberta, Canada
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Posted Thu Feb 14, 2013, 2:39pm
Subject: Re: Automation of HX cooling flush?
 

Here's an awful MSpaint picture. :P

Again, knowing nothing about this particular machine I don't know if that's a straight through port on the grouphead or if there's something there the expansion valve needs...  Or which side of the 3way valve that chamber is on.

ddubick: oscarmod.jpg
(Click for larger image)
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Coffeenoobie
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Coffeenoobie
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Location: PNW
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Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Thu Feb 14, 2013, 2:46pm
Subject: Re: Automation of HX cooling flush?
 

Thanks for the drawing. That is what I thought you meant.  That side only opens when the pressure get really high, so it would not really give you the flow temp.  I think that why the guy in H-B.com drilled into the top of the group head and added the thermocoupler there.  If I remember correctly where the red dot is.

Coffeenoobie: grouphead.jpg
(Click for larger image)

 
Coffeenoobie

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Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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ddubick
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Joined: 1 May 2012
Posts: 150
Location: Calgary, Alberta, Canada
Expertise: I live coffee

Espresso: Nuova Simonelli Appia 1Gr
Grinder: OE Pharos, Macap M5, Nuova...
Roaster: Behmor 1600
Posted Thu Feb 14, 2013, 2:58pm
Subject: Re: Automation of HX cooling flush?
 

The valve only opens under pressure, yes.  

I'm saying connect the tee directly to the grouphead, attach the valve at the 90degree port so it can still regulate the pressure and put the probe straight through the tee so that it's surrounded by the water before the valve.  Of course it could be that the expansion valve components aren't all internal to the valve and that it's dependant on something in the grouphead to function, in which case this wouldn't work.  Unless of couse another fully contained expansion valve was used.

All this thought over a machine I don't own... :D
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Coffeenoobie
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Coffeenoobie
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Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Thu Feb 14, 2013, 4:06pm
Subject: Re: Automation of HX cooling flush?
 

It is just a thought experiment. Thanks for the thoughts.

 
Coffeenoobie

Buying advice: GRINDER GRINDER GRINDER. Don't cheap out on the grinder.

My coffee treasure map...
Click Here (maps.google.com)

Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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ddubick
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Joined: 1 May 2012
Posts: 150
Location: Calgary, Alberta, Canada
Expertise: I live coffee

Espresso: Nuova Simonelli Appia 1Gr
Grinder: OE Pharos, Macap M5, Nuova...
Roaster: Behmor 1600
Posted Fri Feb 15, 2013, 7:51am
Subject: Re: Automation of HX cooling flush?
 

Got a lot of work done last night.

Got my menu system working so I can change parameters from the machine and don't have to change the code and reupload to the controller.

Got an 'Auto Backflush' program working - pop blind filter and calfiza in and set the program and it will turn on 10 seconds, off 10 seconds as many times as are set in the parameters.

As the volumetric Appia has a microcontroller as a brain I knew there had to be a place on the controller board for me to draw 5 volts from to power my controller and I found it last night.  So my controller doesn't have to be hooked up to the wall or my computer anymore (although it still is because I'm still tweaking things and want the data link to capture data - waiting for a bluetooth module to arrive from China to do this wirelessly in the future).

Had an idea last night to hook into the volumetric sensor so I can tell how much water is flowing through.  I'm sure I could make use of that data somehow.

I'm thinking I have to play with my PID settings again as I think the flush is taking a little too long and using too much water, I can probably do better.

Took some video I'm going to try to upload to youtube (never done this before).

ddubick: appia4.jpg
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Coffeenoobie
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Coffeenoobie
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Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Fri Feb 15, 2013, 8:42am
Subject: Re: Automation of HX cooling flush?
 

Very cool, I am impressed.

 
Coffeenoobie

Buying advice: GRINDER GRINDER GRINDER. Don't cheap out on the grinder.

My coffee treasure map...
Click Here (maps.google.com)

Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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ddubick
Senior Member


Joined: 1 May 2012
Posts: 150
Location: Calgary, Alberta, Canada
Expertise: I live coffee

Espresso: Nuova Simonelli Appia 1Gr
Grinder: OE Pharos, Macap M5, Nuova...
Roaster: Behmor 1600
Posted Fri Feb 15, 2013, 6:55pm
Subject: Re: Automation of HX cooling flush?
 

Here's the video: http://youtu.be/H4VOnSRHG7M

Unfortunately just shows the automated flush.  I don't do the whole routine.

I'll do that sometime soon to show the temp stability throughout the shot.

I'll also graph some of the data I'm grabbing.
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Coffeenoobie
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Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,052
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Sat Feb 16, 2013, 7:42am
Subject: Re: Automation of HX cooling flush?
 

Looks cool.

 
Coffeenoobie

Buying advice: GRINDER GRINDER GRINDER. Don't cheap out on the grinder.

My coffee treasure map...
Click Here (maps.google.com)

Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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ddubick
Senior Member


Joined: 1 May 2012
Posts: 150
Location: Calgary, Alberta, Canada
Expertise: I live coffee

Espresso: Nuova Simonelli Appia 1Gr
Grinder: OE Pharos, Macap M5, Nuova...
Roaster: Behmor 1600
Posted Sun Feb 17, 2013, 9:14pm
Subject: Re: Automation of HX cooling flush?
 

Now I can store changes to the settings in the eeprom of the controller (had to modify the program and reupload before).

Maybe I'll get my wife to video my whole routine tomorrow morning.
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Coffeenoobie
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Coffeenoobie
Joined: 11 Dec 2011
Posts: 3,052
Location: PNW
Expertise: I like coffee

Espresso: N S Oscar
Grinder: K30 & Vario W
Posted Sun Feb 17, 2013, 9:17pm
Subject: Re: Automation of HX cooling flush?
 

I would very much like to see it.

 
Coffeenoobie

Buying advice: GRINDER GRINDER GRINDER. Don't cheap out on the grinder.

My coffee treasure map...
Click Here (maps.google.com)

Oscar trick out: http://s156.photobucket.com/user/GandBteam/story/14231
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