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Johnson Controls makes this freezer temperature controller. You set the temp you want, drop the prob in, plug this into the wall then the freezer into the controllers plug. It cuts power to the freezer when it gets too cold. It works awesome! [link]
Effectively, all you have to do is add a thermostatically controlled switch to control the compressor. Some have recommended products like this (though I don't have personal experience with it). You plug the unit into your wall, freezer into the unit, put the thermocouple in the freezer and set the thermometer.
It was surprisingly cheap. You can buy the necessary converter online or at any brew shop. They should run you about $60. Just search convert freezer to fridge on Amazon etc.
Basically, you plug in your freezer and the controller cuts it on and off to keep it at a fridge temp rather than freeze. Genius.
From there, I took the lid off and built a frame out of 2x4's that I glued to the chest. I used the frame to drill my holes for the taps, hoses, etc. and then re-mounted the lid's hinges to the 2x4's.
My overall cost to set up a two keg system was about $500 for kegs, taps, tanks, etc.
If you are serious and want to do it, just shoot me a message and I'm happy to help.
I used this Ext temp controller instead of bothering with a battery backup or even worrying about the damned settings on the winedor itself.
Hell I even moved it to by 240 bottle wineador from my 28 bottle when i last upgraded.
Nice! How are you regulating the temperature though? I would have thought you would need something like this temperature controller or do you just want your beer that cold?
I use this, recommended by /u/mahstahblahstah; works well.
I have this guy: [link]
Works perfectly. Shuts the power off when my fridge reaches 65 degrees.
Well, you can get one ready made like this [link]
Or you can DIY and save a few bucks.
There are tons of how tos on the STC-1000 temp controller builds
I have this guy. Johnson Controls A19AAT-2C Freezer Temperature Controller [link]
Turn it into a keg refrigerator with this.
I bought this one Haven't had a chance to use it yet though
Got it in today, will see how it goes. Has plenty of excellent reviews.
A deep freezer that only goes down to 43 degrees? Usually it's the opposite. Usually if you are converting a deep freezer you need one of these. That being said, 43 is plenty cool enough for beer. Most should be served around 38-40 anyways. I like mine colder, but that's me. If you are having foam issues you can try a few things. If you just get lots of foam on the first pour, try setting up an air cooler for your tower. If you have issues all the time, it's probably a regulation issue. I'm sure you've probably read about volumes of CO2 vs. temp. I would start low, like 8-12 psi, and increase from there. Make sure you let your keg acclimate to the new pressure overnight whenever you change it (you might even want to purge it). I run Sierra Nevada at about 36 degrees at 11 PSI. I fought foaming issues for weeks so let me know if you have any questions.