Johnson Analog for Heat

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I have the Johnson Analog controller that has ability to control heat as well as cold. I just can't remember if you move the black or white wire to the middle post for heat control. I have looked for the old article I read explaining it, but I cannot seem to find it.

 

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Nvm... I finally found it. 8th post.

http://www.thebrewingnetwork.com/forum/viewtopic.php?f=19&t=23694#_thread