I have an older buck stove that the thermostst went south. I tried the new three disc one but I heat my house with wood an would freeze to death with this one. I called the dealer that sold it to me an told her to send me the one disc rheostat one. I received them in the mail today an the disc dose not have a plus or minus on it so I don't know which way to put the wires on. With this new one their is no common wire either. I am using the old wire trying to think how to do this. any one out their can help me I sure would be happy.....