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Old 08-05-2013, 05:04 PM   #1
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Default Wiring a chest freezer with a STC 1000 with a constant and fan

I will be getting a Frigidaire chest freezer soon and will be turning it into a keezer/storage beer area and need a little help with what I am looking to do.

Here is the wiring diagram of the freezer
http://manuals.frigidaire.com/prodin.../297010501.pdf

so I am thinking I can leave the plug as is and tap the STC1000 into the cold control (C3 / 4R) for the cold and into some constant to control the hot going out to a receptacle that I can plug something in, Probably won't do this as I don't see a point in heat.

I also wan to have a DC computer fan go on with the cooling cycle so again, I could go out to a receptacle and plug in a fan that is on a cell phone charger or something.

Then I would like a constant receptacle for random things that need that.

I know my way around electricity but am having a hard time envisioning this one.

Is there anyone that has done this and can give advice or point me to some diagrams?


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Old 08-05-2013, 07:47 PM   #2
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Split the cooling outlet with an adapter. You may want heat one day. Use the outlet the stc1000 uses for a constant.


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Old 08-05-2013, 07:52 PM   #3
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Hook the fan to a separate wall wort? I am assuming your plugging the stc into a constant outlet. Why would the fan need to run off the fridge?
I want to hard wire it so the freezer runs as it would before so for example

you open with the freezer while it is not cooling and the light still turns on or all the other features like defrost still work as intended it is just I am overriding the cooling sensor with the STC1000 sensor.

While I am at it, I can setup a constant power outlet inside to run anything.

I thinking going with a variable speed AC computer fan would be better. Anyone know of a good place for those?
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Old 08-05-2013, 08:00 PM   #4
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Ah. So there is s light. Maybe cut into the power line for the compressor and use that to power the stc. Follow the lead cord for a good constant feed.

Or put a light above the freezer. Why would you defrost?
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Old 08-05-2013, 08:39 PM   #5
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I'm having a hard time figuring out exactly what you're saying in your original post, particularly as regards the hot circuit.

Here's what you can do for the fan though.

You can get an AC fan for pretty cheap, and then you don't have the extra step of socket->power adapter->fan. I threw one of these in my ferm chamber:

http://www.amazon.com/gp/product/B004YTSB7/ref=oh_details_o09_s00_i00?ie=UTF8&psc=1

You can wire it directly to the cold control terminals on the thermostat, parallel to the compressor. Make sure to ground the chassis of the fan to the fridge with mounting screws to eliminate the chance of an unpleasant shock.

That being said, you probably want the fan to shut off when you open the lid, no? If that is the case, I would get a normally-closed relay or some solid-state switching device, wire the relay coil to the lid switch, and run the load side of the relay in parallel to the compressor on the thermostat switch. That way, the fan will only run if the lid is shut and the temperature is above the set point.
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Old 08-05-2013, 09:34 PM   #6
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Odds are the defrost will not run as you will not cool enough to develop frost. If you search the site you will find several wiring diagrams to suit your needs. I have mine wired so the fans run AFTER the cooling cycle wired off the heat side of the STC-1000 wired to an outlet running two 12volt dc computer fans.
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Old 08-05-2013, 10:51 PM   #7
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Odds are the defrost will not run as you will not cool enough to develop frost. If you search the site you will find several wiring diagrams to suit your needs. I have mine wired so the fans run AFTER the cooling cycle wired off the heat side of the STC-1000 wired to an outlet running two 12volt dc computer fans.
that's an interesting idea, so you have your cooling set to say on at 45, off at 35 or whatever and then you have the heat on at 35, off at 40 or something?
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Old 08-05-2013, 11:09 PM   #8
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Basically yes the controller will cut out at your set temp My fan comes on just after and the temp will drop 3-5* (air temp) more. I maintain a 5 degree swing on the control which works out to 1-3* liquid temp if you put your probe in water. I set a temp probe inside a keg (I have a pic somewhere will post later) and in no fluctuations in the 3 gallon keg with a separate temperature readout. I monitored my temps inside and in the coffin and found that this works great the fan circulates cool air in and out and doesn't run all the time.
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Old 08-07-2013, 03:42 PM   #9
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So I got some supplies yesterday to start the build sometime soon. I don't even have the freezer yet btw.

But I got a metal 3 gang outlet box, it is a little over an inch thick and thought it would fit snug in a rectangle hole I would cut out in the 2x6 and then basically wire like this:

1 outlet for constant power
1 outlet for when cooling cycle is on
1 outlet for when heating cycle is on

I would have the wires coming out of the back of the collar into conduit that I got as well and down to the wiring of the freezer and then the wiring to the STC would be run to wherever I am putting that.
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Old 08-09-2013, 03:13 PM   #10
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I got some 13/16th x 10 poplar for 2.69/ft at the lumber yard that should be nice for the front and sides. Also getting the 2x6 from houses being built in my neighborhood. That should help offset all the other stuff


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