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Old 05-31-2011, 04:51 PM   #1
flabyboy
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Default Johnson Temp Controller

Quick question. I just received my Johnson temp controller for my kegerator project and am wondering if any of you had to open up the box and change around any of the jumpers inside. The menu buttons seem pretty straight forward and it is factory preset for cooling purposes.

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Old 05-31-2011, 04:54 PM   #2
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I changed mine around, but I was using to to heat a freezer in the winter. I think that if you are using in cooling mode you should be fine. The other jumper is for cut-in/cut-off, and I think most people use the default.

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Old 05-31-2011, 06:27 PM   #3
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cooling no...heating yes

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Old 05-31-2011, 08:08 PM   #4
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I'm using mine to keep a cheat freezer in my house between 40-45 degrees. Should be good not touching it then.

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Old 05-31-2011, 08:23 PM   #5
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You're going to want it set to cooling and to cut out. You'll want the set point at 40 and a dif of 4 or 5 to keep it between 40 & 45.

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Old 05-31-2011, 10:03 PM   #6
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Cool. Thanks for the info. What do you mean "set to cut out"??

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Old 06-01-2011, 01:52 AM   #7
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Quote:
Originally Posted by h22lude View Post
cooling no...heating yes
He's right.
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Old 06-09-2011, 12:56 PM   #8
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So have my setpoint at 40 and my DIF at 5 and the temp dropped to 35. Do I need to set the SP to 45 if I want the temp between 40-45

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Old 06-09-2011, 01:12 PM   #9
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Now I have the SP at 45 and DIF at 5. The freeze kicked in at 45 and I went to look at the temp 10 mins later and it's 35. WTF

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Old 06-09-2011, 02:19 PM   #10
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Quote:
Originally Posted by JJL View Post
You're going to want it set to cooling and to cut out. You'll want the set point at 40 and a dif of 4 or 5 to keep it between 40 & 45.
In this setup, the freezer will turn ON at 45, and turn off at 40. The freezer will turn on at the SP + Differential, which is 45. It will turn OFF at the SP (Cut-out).

The Cut-in and Cut-out is what they controller will do when the SP is reached.

Keep in mind that even though the freezer has turned out, there is a chance that the temp could drop a degree or two as the cold soaks into the freezer.

And a small fluctuation in air temp is not a concern. It's the temp inside the fermenter that matters, and it will be more stable, as it has such thermal mass to not lose or gain temp as quickly.

I really suggest you re-read the manual a few times. There is a small section that should give a visual example of how the cut-in and control mode work together. It's not hard to understand if you can "see" it.
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