I wanted a second temperature controller to use, in addition to my Love Controls TS-13010 controller, but I didn't want to spend a lot of money. I found a new Johnson A19ABA-40C on Ebay that I got for $16 shipped. This is commonly used by homebrewers and wiring it up is easy. Temperature controllers can be used for controlling the temperature of a freezer or refrigerator for fermenting beer in, or a kegerator.

If you are using this for a fermentation refrigerator or freezer, you COULD wire this directly inline with the appliance's power cord. I decided to wire it to an extension cord so that I could move it between refrigerators. Parts Needed: Cable Clamp for romex cable Johnson A19 Controller Extension Cord. I used 16ga which should be fine for a refrigerator Wire Nut (not pictured)

Cut about a foot off the outlet end of the extension cord, or cut more depending on where you want to mount the controller in relation to the appliance's power cord Strip back about two or three inches of the outer insulation of both pieces of the extension cord, and then strip off a half of an inch of the insulation of the individual wires inside the cords. Twist each individual exposed wire so that the ends are not frayed

Attach the cable clamp onto the controller using the hole in the bottom of the controller. Loosen the two screws on the clamp to allow the extension cord wire to pass through.

Insert both ends of the extension cord into the cable clamp, and pull through. Twist the two white wires together and fasten with a wire nut. Twist the two green wires together, form the end into a backwards question mark, and fasten the pair under the green screw on the housing of the controller. Take black wires, and form them each into backwards questions marks and fasten them under each of the gold screws on the body of the controller. Check to make sure that there aren't any stray wires touching where they shouldn't. Now tighen the two screws on the cable clamp so the cords will not pull out, and put the cover back on the controller. Enjoy temperature controller fermentation or serving!