Step 7: Finish and Testing
Now it's time to test it. In the picture below I set the thermostat on the Johnson Control to 60F. As you can see, with the switch on, and a lamp plugged in, the electrical outlet is powered. To test, we'll drop the temperature bulb in a cup of ice water.
Within a few seconds the bulb has cooled to 60F and the controller breaks the connection turning the light off.
When using this with your freezer, you should drop the copper temperature sensor bulb in the freezer and plug it in. Set your freezer on high and set the Johnson Controls unit to the desired temperature.
As always, be careful when working with household current. If you don't understand the steps of this project or feel uncomfortable with them, consult a qualified electrician.
Good luck and happy brewing.