Ok so I fianlly got everything moved into the new house. One of the first things I want to do is to hook up my compressor. You know before all the boxes are unpacked I need the comprssor hooked up. Anyway, the compressor has black, white and a green wire. At the old house I just hooked these up to a three wire dryer cord and went to town. The new house has a 4 pronged plug in the wall. I bought a new cord but, it has black, red, green and white. What do I do with the red wire?