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Delonghi EC702 Extremely High Group Head Temp
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Discussions > Espresso > Machines > Delonghi EC702...  
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 1,979
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Thu Sep 6, 2012, 3:45pm
Subject: Re: Delonghi EC702 Extremely High Group Head Temp
 

Nickfrogger Said:

A PID would only adequately provide a starting temperature for such a small machine. The boiler is so small that no matter how much programming you do the temp will drop significantly through the course of the shot as cold water gets pumped into the boiler.

Posted September 6, 2012 link

Not quite so sure.  The PID function is one thing and the alarm can do another.  Gaggia has more wattage, but a small boiler.  I can get intra shot fall, fairly stable, or intra shot rise and the heater is only running about 50% of the time.  There is still enough power/wattage in the EC702

http://coffeegeek.com/forums/espresso/machinemods/571792

I am not necessarily recommending to do this with the EC702 but you can put together the pieces for less than the kit.

 
D4F also at
http://www.gaggiausersgroup.com/
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Nickfrogger
Senior Member
Nickfrogger
Joined: 26 Nov 2010
Posts: 201
Location: Spokane
Expertise: I love coffee

Espresso: Rancilio Silvia V3 w/PID,...
Grinder: Lelit PL53, Baratza Maestro
Vac Pot: Yama TCA-5 Siphon
Drip: V60 (A red one!)
Roaster: Behmor 1600
Posted Thu Sep 6, 2012, 4:01pm
Subject: Re: Delonghi EC702 Extremely High Group Head Temp
 

D4F Said:

Not quite so sure.  The PID function is one thing and the alarm can do another...

Posted September 6, 2012 link

But like you say, there is more going on there than just a PID. 16 pages only comes from deep testing and research, something the average Delonghi user isn't going to appreciate :)

Super interesting thread, by the way. You've provided more hours of anti-paper procrastination, and for that I am deeply thankful ;)

 
There's a big difference between drinking coffee to wake up and waking up to drink coffee.
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D4F
Senior Member


Joined: 15 Mar 2012
Posts: 1,979
Location: USA
Expertise: I like coffee

Espresso: Gaggia Classic PID
Grinder: Baratza Forte-AP
Posted Thu Sep 6, 2012, 5:23pm
Subject: Re: Delonghi EC702 Extremely High Group Head Temp
 

I do not mean to change the thread, though this relates if OP is interested.  

The idea is fairly straight forward in spite of 16 pages.  

The heater can provide the calories needed to hold shot temperature, simple math.

The timing needs to start slightly ahead, so a blip of steam switch.

You can cycle the steam switch on and off, AndyPanda illustrated, and add the heat, provided you do not have a 3 way that prevents that during brew, or you work around.

The PID function is too damped to add enough heat in short enough time, so use the alarm function.  The alarm cycles the heater on and off, and the amount of heat cycle is indirect, based on alarm temperature setting.  That is trial and error as was the amount of steam switch flipping.  Unfortunately matching calories is flowrate dependant, cold water calories.  You need to get consistent grind, beans, and flow as a byproduct, but don't we all need to do that to get good espresso?  In addition, the next shot can be done much more quickly.


http://www.youtube.com/watch?v=sluei1-IkTw

 
D4F also at
http://www.gaggiausersgroup.com/
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CoffeeSleuth
Senior Member
CoffeeSleuth
Joined: 4 Oct 2011
Posts: 8
Location: Nevada
Expertise: I live coffee

Espresso: Delonghi EC702
Grinder: Starbucks Barista Burr...
Drip: Ceramic Pour Over
Roaster: Nostalgia Popcorn Popper
Posted Fri Sep 7, 2012, 12:58pm
Subject: Re: Delonghi EC702 Extremely High Group Head Temp
 

This helped me out a lot.  It seems shortly after beginning to pull the shot, the temp light will go out.  I found that if I click the steam function shortly after beginning the pull, that it will maintain temperature through the whole shot.
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MJW
Senior Member


Joined: 25 Jul 2012
Posts: 179
Location: Silicon Valley
Expertise: I love coffee

Posted Sat Sep 8, 2012, 7:14pm
Subject: Re: Delonghi EC702 Extremely High Group Head Temp
 

Another way to prevent the light going out is by pumping water before starting the shot.  Pump water until the light goes out, and when the light goes back on a few seconds later, start the shot.

Waiting until just the moment the light clicks on puts the machine at the top of its temperature cycle.

Now that you're using the steam switch right, I hope your espresso is much better!
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