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Old 11-16-2009, 02:02 AM   #1
mr_beland
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Mar 2009
Saint-Hyacinthe
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I'm planning to build an electric boiling tun. The plan is to use 2 x 3000W water elements on 240V (245V exactly) and control it manualy. BUT!.. with this amount of amp (24.5A), I can't use an ordinary rheostat. Some guys here in the forum seems to use an PID thermostat, but i don't figure how you can obtain an consistant boiling. A friend of me, told me that thyristor dimmers could sustain this intensity. I seek the web, but it wasn't conclusive. Later, today, i was seeking again and i found this :
http://www.galco.com/scripts/cgiip.e...T3A-3AF20-IDEC

Is this suitable for this application. If you set it in the lowest delay range, it could give an consistent boiling without excessive fooling and evaporation rate.

I also want to weld the 1'' locknut that fit for water element on bargain fittings web site, anyone ever try this or have better ideas?
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Old 11-16-2009, 02:20 AM   #2
mr_beland
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Damn it... it can only sustain 3A, but there's an other model that sustain 5a...


so many deceptions... please help me...

And again... a bit of hope.. I found that
http://www.dnhindustries.com/asp/lumitron_dimmers.asp
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Old 11-16-2009, 06:16 AM   #3
The Pol
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Using a PID is easy.

Use the MANUAL mode, set the cycle time to 1 second. Then you simply control the boil with % output. I use 70%. That is 70% on and 30% off, the entire cycle is 1 second, it sustains a boil perfectly.

A huge dimmer is going to cost you dearly.

 
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Old 11-16-2009, 08:46 AM   #4
ausdb
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Apr 2008
Perth Australia
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You need to use the PID controller to drive an SSR hopefully fitted with a rather large heatsink!!

Alternately if you are familar with the Arduino environment you can make a simple project with an Arduino baseboard and a potentiometer which can drive your SSR with 0-255 steps. I have a pretty rough looking setup based on an veroboard arduino clone a linear taper pot and a 40A SSR. This is used to control the power input to a 3000W element working on 240VAC for a small boil kettle I find it works very well.

 
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Old 11-16-2009, 11:12 AM   #5
OhioBrewingTechnologies
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Oct 2009
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Our primary product is a 3800-watt controller, but it is using a higher-current switch so upgrading is pretty easy. Let me know if you're interested in trying one out.

Dan

 
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Old 11-17-2009, 01:39 AM   #6
mr_beland
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Mar 2009
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Quote:
Originally Posted by The Pol View Post
Using a PID is easy.

Use the MANUAL mode, set the cycle time to 1 second. Then you simply control the boil with % output. I use 70%. That is 70% on and 30% off, the entire cycle is 1 second, it sustains a boil perfectly.

A huge dimmer is going to cost you dearly.
I bought an PID temperature controller from Auber Instrument (very cheap and I got no problem) for my fermentation chamber, but it doesn't have the manual mode.

Then.. the question is, where do you buy the PID w/manual mode
The cheapest for sure!
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Old 11-17-2009, 03:32 AM   #7
passedpawn
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Search for a variac. Used to use these for controlling AC loads. I don't believe I ever saw one for these loads, but who knows.

I think the PID+SSR route is way easier. Way. You can lead a horse to water but you can't make him drink, though.
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Old 11-17-2009, 03:32 AM   #8
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Quote:
Originally Posted by mr_beland View Post
I bought an PID temperature controller from Auber Instrument (very cheap and I got no problem) for my fermentation chamber, but it doesn't have the manual mode.

Then.. the question is, where do you buy the PID w/manual mode
The cheapest for sure!
What model?
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Old 11-17-2009, 03:40 AM   #9
slouch
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Nov 2009
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Are you running your 240 to a separate breaker box to do the split?
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Old 11-17-2009, 04:33 AM   #10
mr_beland
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Mar 2009
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I live in an apartement. I did 8 20L brews on my range, and it suffers from that much weight. It's why i want to go electric.

I will unplug the dryer each brew (245V exactly; at 6000W, there's 24,5A through the lines). There's an 30Amp ON/OFF breaker (i dont know the technical name)

Does il matter if my boiling tun have an 15m power cable?


And again, what is the best (cheaest) PID controller for this application. With the manual mode (on/off cycle)
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