Building a Keggerator/Keezer – Part 1 – Temperature Control

For a while now I’ve wanted to convert a chest freezer into what is basically a fridge for kegs – a ‘Keggerator’, or ‘Keezer’.

Having the nice flat, sturdy bottom makes the chest freezer ideal for beer kegs, but they can’t be left as a freezer since frozen beer is no good.

To get around this I bought a digital thermostat controller from ebay (no point putting up a link as ebay links don’t last long, but search for something like ‘Digital Temperature Controller Sensor Thermostat Control’ ) – cost a whole £9.

The freezer was free – donated by the parent of a friend who no longer wanted it, and was going to chuck it away.

First job was to remove the vented side panel to see where I could fit the controller without damaging any component of the freezer

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There was plenty of room below the front control panel.

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I carefully cut out the hole using my dremel with a metal cutting disc.

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Check for fit…

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The basics of the wiring are to cut into the main power supply, before it reaches anything, and fit a connector block. From there the earth and neutral continue to their original destinations, but the live goes to the controller, and the return live from the controller goes to where live originally went.

From the connector block we also need an additional live and neutral feed to go to the controller for its power supply.

Finally the temperature sensor needs connected to the controller.

The precise way you may choose to wire this should you attempt it will depend on the freezer and your particular controller.

Since I was adding cable I was sure to add enough that I could wire up the controller outside the freezer where it was much easier and accessible, then slide it back into place and secure with the orange slide clips that just slide up the side and press against the inside wall, holding the unit in place.

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With the power switched on and the temperature set on the controller (again, how to do that will depend on your own controller) the freezer sprang into action and began chilling.

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Once it hit the target temp, the power to the freezer was switched off by the controller, and only once the temp rose by 2 degrees did it switch back on, again only until the target temp was reached.

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The freezer has a red ‘Alarm’ light – obviously intended to illuminate to warn that the freezer is above, well, freezing. Since it’s going to be like that all the time now, I disconnected the neutral plug from the alarm light, and that stopped that showing, but didn’t stop the freezer running.

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With the testing complete it was time to put the wiring covers back in place and get a keg in the Keezer.

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Next step is to work out a way to use my beer engines with the Keezer…. it’s taken me a good few months to get around to doing this bit, so I wouldn’t hold your breath for part 2, but it will be coming soon(ish)

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