D4F Senior Member Joined: 15 Mar 2012 Posts: 1,225 Location: USA Expertise: I like coffee
Espresso: Gaggia Classic PID Grinder: Preciso
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.
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
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.
D4F Senior Member Joined: 15 Mar 2012 Posts: 1,225 Location: USA Expertise: I like coffee
Espresso: Gaggia Classic PID Grinder: Preciso
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.
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, 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.
MJW Senior Member Joined: 25 Jul 2012 Posts: 74 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!
Symbols: = New Posts since your last visit = No New Posts since last visit = Newest post
Forum Rules: No profanity, illegal acts or personal attacks will be tolerated in these discussion boards. No commercial posting of any nature will be tolerated; only private sales by private individuals, in the "Buy and Sell" forum. No cross posting allowed - do not post your topic to more than one forum, nor repost a topic to the same forum. Who Can Read The Forum? Anyone can read posts in these discussion boards. Who Can Post New Topics? Any registered CoffeeGeek member can post new topics. Who Can Post Replies? Any registered CoffeeGeek member can post replies. Can Photos be posted? Anyone can post photos in their new topics or replies. Who can change or delete posts? Any CoffeeGeek member can edit their own posts. Only moderators can delete posts. Probationary Period: If you are a new signup for CoffeeGeek, you cannot promote, endorse, criticise or otherwise post an unsolicited endorsement for any company, product or service in your first five postings.
= No New Posts since last visit 