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Old 06-13-2013, 10:26 PM   #1
bluedog_Brewing
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I recently picked up a newer GE side by side fridge to replace my old chest freezer that died. I wanted to turn the freezer side into a kegerator and the fridge side for fermenting ales, so I knew that I would need to replace/override the factory thermostats to make things work.

I looked inside before i bought it and saw it had dial knobs for the thermostats so I thought I would be good to go with the standard method of replacing the mechanical thermostats with digital ones. I bought two STC-1000s from ebay and started checking out the wiring while I was waiting for the thermos to arrive. Once I opened up the panel with the thermostat knobs, I saw they are connected to a small circuit board and have 6 wires connected to it. I found out that these knobs are connected to digital rotary encoders. They send some sort of pulse signal back to the main control board to indicate the position of the knob. Unfortunately, I could not find a way to jump the incoming power line directly back to the board to turn the fridge on and off. I probably could have built a small square wave generator with a timing chip but it didn't seem like it was worth it.

So I found the wiring diagram and starting poking around the main board, the compressor and condenser area, and the evaporator. My new plan was to cut into the compressor and fan power between the main control board and the devices. Since I would be leaving the factory thermostats in place, the control board would always be trying to cool the fridge and freezer, and I could use the STC-1000s to disconnect and reconnect power as needed. To complicate things, this particular GE fridge uses 120VAC for the compressor and 13VDC for the condenser and evaporator fans.

I ended up using a two pole relay to switch the 13VDC to the condenser fan and the 120VAC to the compressor. This relay is controlled by the STC-1000 that monitors the freezer temp. I left the evaporator fan connected and running all the time to provide circulation and even temperature distribution for the kegs.

I mounted the STC-1000s in the fridge door and tapped into the interior light for power. Right now I am using 3 60mm AC box fan but can only get the fridge side down to 45F when the freezer is at 35F. I plan to replace them with 2 120mm AC fans to enable better crash cooling.

I used a piece of stainless steel sheet metal to cover the hole where the ice dispenser used to be. I found a guy on ebay, he even cut it to the size I needed for free. I used a piece of plywood behind the sheet metal for reinforcement and installed my 4 taps,

I still need to add a shelf in the freezer to get a second layer of kegs in there but I only have one beer kegged right now so its not urgent. I am so glad that I can keg now and don't have to wash a bunch of bottles.

I know some other people here are working on similar projects, if you have any questions feel free to ask.

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Old 06-13-2013, 10:29 PM   #2
LabRatBrewer
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Wow, nice work!

 
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Old 06-13-2013, 11:14 PM   #3
FLBrew
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Wow! I've been wondering if this could be done....and now,I want one. However, this is way beyond my scope of expertise. What trade
(Friend) would I need to beg for help? Electrician? Fridge tech?

 
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Old 06-13-2013, 11:31 PM   #4
bluedog_Brewing
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May 2010
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The electrical work isn't too hard but you definitely want someone who has worked with it before. Mostly it was a lot of cutting metal and plastic and foam. I used a dremel with a cut-off wheel a lot. Some drilling and screwing into sheet metal to put up the shelves.

I got most of it done over the memorial day weekend and finished up over the next couple weeks, working a little bit here and there after work.

It was a lot of work. But now I get to enjoy the beauty of my own oatmeal stout on tap 5 feet from my desk

 
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Old 06-14-2013, 09:33 AM   #5
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Old 06-15-2013, 04:43 PM   #6
Brewer_opie
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Do you have a schematic on how you wired in?

 
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Old 06-16-2013, 12:26 AM   #7
bluedog_Brewing
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Quote:
Originally Posted by Brewer_opie View Post
Do you have a schematic on how you wired in?
No schematic. I just cut the condensor and compressor wires from the main control board and switched them with a 2-pole relay controlled by one STC-1000. I run the fans to cool the fridge side directly off of the other STC-1000.

 
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Old 06-16-2013, 12:39 AM   #8
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Awesome... Thanks.

 
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Old 06-21-2013, 11:08 PM   #9
Stealthcruiser
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Thinkin' here, caution!

You use the fans to move air from the kegerator side, to the fermenter side?
I'm digging the idea of a side by side, but the circuit board crap spooks me, splicing into it.
I have no problem with the cutting / drilling / screwing / sheet - metal-ing part.

I like your setup!
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Old 06-21-2013, 11:10 PM   #10
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When yer' talking the "condenser wires", you mean for the fan blowing across the condenser, yes?
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