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Old 06-04-2012, 11:56 PM   #1
LeverTime
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Default Help with Johnson Control Unit

I bought the A419 digital control unit that I think a lot of people on this forum have, to attach to a barely used chest freezer. I adjusted the set temperature to 65 and the differential to 3 degrees (latter was the default). When I hooked everything up, the temperature was 75 degrees. I went down to check it out after awhile, and freezer was turned off but the reading on the control unit was 55!

Is there something really obvious I am doing wrong? Let me know if you need more information to answer my question.



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Old 06-04-2012, 11:58 PM   #2
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Hi

It sounds like you have the probe hanging in air inside the freezer. Tape it to the wall and things will work better. You will have to set it a bit below your target temperature, but the probe will be out of the way.

Bob



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Old 06-05-2012, 12:36 AM   #3
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You could install a thermowell, that way it will stay put and you won't get the nuisance readings. I happen to have access to many JCI parts and have a few laying around if you want one I'll be glad to hook you up.

PM me your address and I'll send it out

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Old 06-05-2012, 12:39 AM   #4
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Originally Posted by Jdk261 View Post
You could install a thermowell, that way it will stay put and you won't get the nuisance readings. I happen to have access to many JCI parts and have a few laying around if you want one I'll be glad to send you one.
That would be awesome, thanks. PM sent.
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Old 06-12-2012, 11:00 AM   #5
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Hi,

I'm
About to install mine soon actually. I'm guessing I want this set to cooling mode. Correct?

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Old 06-12-2012, 01:25 PM   #6
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Never mind haha I figured it out :-)

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Old 06-12-2012, 02:41 PM   #7
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Never mind haha I figured it out :-)
Yeah, the instruction manual shows how to customize the unit in a number of ways, but I think the default settings (at least for the internal jumpers) are appropriate for what most people on this forum are using it for.
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Old 06-12-2012, 03:05 PM   #8
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Yeah I'm using it for a keezer so I'm going to go cooling mode. 12m cycle delay, 40 f set point, 3 f differential, cut in. The only thing I don't really understand fully is the OFS. Any help here?

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Old 06-12-2012, 03:19 PM   #9
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Here's my version of a homemade thermowell. I filled an old hot sauce bottle with water and drilled a hole in the cap. Free, easy, and works really well.

If I've got a beer that's really going crazy, I'll also do the tape-bubble-wrap-to-the-fermenter trick.



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Old 06-13-2012, 01:22 AM   #10
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Originally Posted by mattyb85 View Post
Yeah I'm using it for a keezer so I'm going to go cooling mode. 12m cycle delay, 40 f set point, 3 f differential, cut in. The only thing I don't really understand fully is the OFS. Any help here?
I am not an electrical engineer, but from my reading of the manual, I think that is only relevant if you connect your own circuit, like a timer, to the controller. I'm not sure how or why a brewer would use that, but if anyone can help me out, that would be awesome.


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