Posted Thu Sep 6, 2012, 2:45pm Subject: Re: Delonghi EC702 Extremely High Group Head Temp
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.
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
Posted Thu Sep 6, 2012, 4:23pm 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.
CoffeeSleuth Senior Member 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, 11:58am 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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