We recently added a keezer to our arsenal and the person we purchased it from was controlling temps by adjusting the internal thermostat. We wanted a bit more control over the temps for storing and serving our beers so I built a temp controller to add to the keezer. A match made in beer heaven.
If you’ve done a bit of looking around at temp controllers you’ve likely seen the STC-1000 mentioned, it’s the go to device for those that don’t mind a bit of DIY. If you have at least some mechanical/electrical abilities this is very easy to build and total cost is only around $40.00. The project can be completed in about an hour once you gather everything up. You ready? Let’s do this.
KEEZER TEMP CONTROLLER BUILD INSTRUCTIONS
- STC-1000 temp controller Make sure to get the one rated for 110v and NOT 220v or 12v DC! (At the time of this post you can get one for $17.92 via Amazon.com, shipped free with a Prime Membership)
- STC-1000 Temp Controller with FAHRENHEIT display Just added to Amazon, no more messing around converting from Celsius! UPDATE PLEASE READ! This is not the same as the °C version of the STC-1ooo. The °F version and only control heating or cooling, it cannot be setup to control two outlets at the same time for simultaneous heating/cooling.
- Duplex Receptacle Outlet
- Duplex Receptacle Trim Plate
- Project Enclosure (I used the 8x6x3 from Radio Shack)
- Power Cord (I used a 15′ cord and cut pieces from it to use for the internal wiring. You can also use an old computer power cord.)
- Wire nuts
- Spade wire connectors (optional)
- Ruler or other straight edge
- Wire cutter / stripper
- Fleshlight (Just checking to see if you’re reading all of this.)
- Dremel or other cutting tool
- Flat and Phillips screwdrivers
- Electrical tape
- Drill and bits
- Lay out all your parts and make sure you’ve got everything there.
- Mark the outline of the STC-1000 and the wall receptacle on the lid of the project enclosure and cut them out. REMEMBER, you want the inner dimensions of the STC-1000 cut into your enclosure!
- Mark and drill holes on the front and back bottom sides (does that make sense?) for the power cord and temp probe to come out of the box, you want these on opposite ends of the enclosure.
- Break the hot side jumper tab off of the wall receptacle, this allows you to control each outlet independently. This is much easier to do before mounting and wiring… trust me.
- Mount the STC-1000 and the receptacle in your enclosure. Attach trim plate over receptacle.
- Cut and strip the ends of your power cord.
- Run power cord and temp probe into the holes you drilled in the enclosure.
- Using the wiring diagram below, wire everything up.
- On the STC-1000, terminals 1, 5 & 7 are connected via wire nut to the black wire on your power cord.
- Terminal 2 will connect to ‘cold side in’ on the receptacle.
- Terminals 3 & 4 will be for the included temperature probe
- Terminal 6 goes to one hot side connection on the receptacle for your heating control. Make a note of which outlet you wire for heating and cooling.
- Terminal 8 goes to the other hot side connection on the receptacle for your cooling control
- Connect the other cold side connection on the receptacle to the white wire on the power cord.
- Connect the green wire on the power cord to the ground on the power receptacle.
- Wrap electrical tape around the power cord and temp probe to use as a stopper inside the enclosure. This will prevent the cords from being pulled and damaging your wiring.
- Making sure all connections are secure and you have no crossed wires, gently lay the lid with the controller and outlet back on the enclosure. Plug in the enclosure to verify it powers up. If you have an outlet tester or multimeter you can set the programming and test each outlet as well.
- Place the lid back on the enclosure and secure it with the 4 screws.
- You. Are. Done.
So there you have it. You’ve just built a temp controller you can use on your keezer to keep your brews right where you want them or in a fermentation chamber for lagering. Add a heat wrap and kick it up for those Saisons and Belgians. Oh yeah, the STC-1000 only reads in Celsius and since I’m an AMERICAN I don’t know how to read that crap. I solved the problem of reading in this Commie temperature scale by printing out a Commie-to-‘Merica conversion chart and attaching it to the controller box with gravity. I’ve included the chart below if you’d like to use it, it prints nicely on business card sheets. You’re welcome.
- We be Keggin’ (mostlyharmlessales.wordpress.com)
- Installing an Electrical Outlet (planitdiy.com)
- How To Homebrew Beer: Temperature (bardsbrewery.wordpress.com)