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Home Brew Forums > Home Brewing Beer > Beginners Beer Brewing Forum > Temp controller on 1935 fridge?
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Old 03-13-2014, 06:01 PM   #1
Stevesmirk
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Default Temp controller on 1935 fridge?

I received a Johnson temp controller years ago, and have yet to use it. I have a 1935 refrigerator--the kind that has the evaporator in the middle that requires defrosting on occasion. I would like to use this as my fermentation fridge. I assumed that since there is no air circulation, that it would not work out so well. Also, I am concerned about any stress on such an old compressor. That being said, I am not sure if my thoughts are correct.
Anyone have an expert opinion?

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Old 03-13-2014, 10:05 PM   #2
TopherM
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What model temp controller you have? The Johnson that most brewers use, you just plug the fridge into the controller, and it cuts power to the unit once the temp hits your set point. If you are worried about the older compressor cycling too much, just make sure you set like a 3-5 degree differential, meaning if you are at a set point of 60F, and the differential is 3, the controller isn't going to supply power until the fridge temp rises to 63, then cut power again at 60. As long as your fridge is decently insulated, it's going to take a pretty long time to lose 3 degrees. It's when the differential is 1 that the fridge kicks on pretty regularly. I have my differential at 1 on a modern display cooler, and my cooler still only kicks on about every 20-25 minutes.

Hope that all makes sense! There's really no particular reason using the controller would tax the older fridge compressor any more than a newer one unless it is just popping on and off too often, which would be a insulation problem more than a function of the old compressor.

Good luck!

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