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Old 10-09-2008, 03:05 PM   #1
darkstar79
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Default johnson controller settings question

I have the digital model (a419) and I want the temp to be at 47 degrees. If I set the controller for 47, it seems like whenever i check it is about 10 degrees below what I set it at. Is this normally the case or is there another setting that i need to change on there to keep it closer to what I want all of the time? Another question I have is will the temp fluctuation be too much is if its colder like this?
This is my first time making a lager so I want to be sure I get it right. I made a 800 ml starter so I hope that is a start in the right direction. I am making an oktoberfest kit from northernbrewer


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Old 10-09-2008, 03:34 PM   #2
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So, you're setting the temperature to 47F and the wort is 37F? Or, is the ambient air in the cooler (fridge?) 37F?

The first thing I would check is the temperature differential set in the controller. What is yours set to?

If you're missing your target temperature, I would recommend experimenting with alternative locations for the temperature probe. Experience has shown the best probe location to be on the outside of fermenter, insulated from ambient air temperature changes.


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Old 10-09-2008, 04:14 PM   #3
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I dont have the wort in there yet, I am testing the controller before I brew today. It is the ambient air temp. The differential is set to 4. I will be somehow taping it to the side of the carboy when I put it in there today.
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Old 10-09-2008, 06:30 PM   #4
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try it with a pail of water or something and tape it to the side and see if you get more reliable temps
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