Bunn H5E 12500.0020
So what do you do when you run across a Bunn H5E water tower model 12500.0020? You know, one of those strange ones hard set for 115f water temp! (for dough proofing). What good is it in a coffee house! I mean, not even white tea wants water at 115f.
Well, found one on Craigslist some time back, got it for a song, $75.
One hundred fifteen fahrenheit no more! All in less than $300 including labor to have PID, SSR, new temp probe etc. installed. Now have sweet 1f resolution water temp control 5gal tower. FYI not running Auber in PID mode, system response too slow and resulted in 7f over shoot. Not surprising since 5gal 120v model. In PID mode heater wouldn't turn full on until about 10f below SV. But works great running as 1f deadband on/off controller with heater full on as soon as below SV and <1f over shoot.
Have a couple more towers to do. Next time may spend a bit more and get a 0.1f resolution PID with on/off capability for even tighter temp control. Though truth to tell this puppy with 1f deadband works pretty darn sweet!
Comment
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Comment by Mike McGinness on November 30, 2010 at 7:10pm
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Oh, FWIW all the lights work normal except "ready", it's always on, go by PID temp display...
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Yes, plug tower in and it auto-fills as normal. Added 20A toggle switch in the back to turn PID and the heater circuit on to avoid heating prior to fill. Couldn't get Bunn's temp probe to be seen by PID so had to use new probe. Don't have a clue what type tc they're using and tried a bunch of possibles. Overflow cup still in there, I think!
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Comment by Mike Sabol on November 30, 2010 at 6:11pm
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Nice! So the Bunn electronics control the fill and your PID is the heating circuit? Did you cut out the overflow cup?
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Comment by Dennis McQuoid on November 27, 2010 at 8:30pm
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I wish I was as handy as you. I'm getting ready to order a new one for about $750.
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Comment by Brady on November 27, 2010 at 5:37am
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Love it! Now all there is to do is perfect the thermosyphon loop mod to eliminate the problem of the first 3 ounces being too cool :).
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