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Home Brew Forums > Home Brewing Beer > Bottling/Kegging > Johnson Temp Controller Kegerator Issues?
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Old 05-01-2013, 03:37 PM   #1
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Default Johnson Temp Controller Kegerator Issues?

Folks,
I'm super bummed and could use some help. I have this kegerator that has had wild temp swings. I bought a Johnson Temp digital temp controller to get my temp w/i +/-1 degree. I set it at 38, and 2 days later my kegs are at 46, WTF. I have the probe taped to one of the kegs. What settings should I be using? Would that even help? Anyone had these same issues?
Thanks
J

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Old 05-01-2013, 04:31 PM   #2
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Check what the differential setting is at.

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Old 05-01-2013, 04:41 PM   #3
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Check what the differential setting is at.
My thought exactly, sounds like the dIF setting is too high. This affects how far from the set point (SP) the temperature is allowed to fluctuate. You probably want to set it between 1 and 3 degrees.
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Old 05-01-2013, 04:48 PM   #4
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Also, I'd check the start delay setting while I'm at it (ASd). This affects how frequently the controller will allow the compressor to cycle. I have mine set to the max (12), which means that it will not allow the compressor to kick on sooner than 12 minutes from the previous cycle. This is to prevent the compressor for turning on and off too frequently, which will shorten the lifespan of your kegerator.

I'm still not sure as to the best way to set the probe. Currently I have mine suspended in a large mason jar of water at the bottom of the kegerator, as leaving it in the open air would cause temp readings to differ drastically from what is actually inside the keg (air temp changes much faster than liquid temp). I'm not sure how this compares (better or worse) to taping it to the side of the keg.

Does anyone know the best method for setting the probe? Is taping it to the side of the keg a good way to measure the keg temp?

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My coffin keezer build.
On Tap:
1. Mystery beer???
2. Yooper's Fizzy Yellow Beer
Bottled:
Kombucha
Primary:
1. Brandon O's Graff
2. Kombucha
UnderCouchers 4 Lyfe
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Old 05-01-2013, 06:05 PM   #5
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Hi Folks,
I have the differential set at 1, I like my temps within a tight range. I have not messed with the ASd, so I am sure its at the default setting of 1. I'll check that and change it to 12. I also placed the fridge's dial temp controller to its coldest setting. from my understanding, and I do this with my fermentation fridge, you attach the probe to the item you want to measure. So, from that P.O.V., I have mine taped to the keg nearest the door. This is the one that'll be the warmest.

Back to the ASd. If its set to 12, and the fridge temp exceeds my differential limit, the compressor won't turn on until the ASd limit has been reached, correct? So, in theory, setting it at the max can allow the beer to warm up beyond the desired range, correct?

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Old 05-01-2013, 06:06 PM   #6
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Oh, I forgot to say thanks for the input! It really helps

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Old 05-01-2013, 06:10 PM   #7
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Quote:
Originally Posted by jbay76 View Post
Back to the ASd. If its set to 12, and the fridge temp exceeds my differential limit, the compressor won't turn on until the ASd limit has been reached, correct? So, in theory, setting it at the max can allow the beer to warm up beyond the desired range, correct?
Theoretically, yes, but I'd be real surprised if your fridge warmed up very much in 12 minutes.
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My coffin keezer build.
On Tap:
1. Mystery beer???
2. Yooper's Fizzy Yellow Beer
Bottled:
Kombucha
Primary:
1. Brandon O's Graff
2. Kombucha
UnderCouchers 4 Lyfe
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Old 05-01-2013, 06:12 PM   #8
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OK, good to know. I'll give it a go.
Cheers!

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Old 05-01-2013, 11:51 PM   #9
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OK, so an update. I have the thermostat set at 33 ( I wanted to bottle) but the beer comes out at 38. I've taken everyone's input to use, so now I think I am just going to make peace with this P.O.S. Kind of bummed.....oh well.

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Old 05-02-2013, 12:51 AM   #10
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Quote:
Originally Posted by jbay76
OK, so an update. I have the thermostat set at 33 ( I wanted to bottle) but the beer comes out at 38. I've taken everyone's input to use, so now I think I am just going to make peace with this P.O.S. Kind of bummed.....oh well.
How long was it set at 33 before you bottled? What kind of dispenser (tower, coffin box, cobra tap, etc)? Do you have a circulation fan in the kegerator?
__________________
My coffin keezer build.
On Tap:
1. Mystery beer???
2. Yooper's Fizzy Yellow Beer
Bottled:
Kombucha
Primary:
1. Brandon O's Graff
2. Kombucha
UnderCouchers 4 Lyfe
hunter_la5 is online now
 
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