I do not have a diagram, but you will need a double pole relay.
Take an extention cord and cut off the end that you plugh things into. Then hook those two wires to the coil terminals on the relay. You will then plug this into the x10 module, just like a light bulb for example.
Now, when the x10 comes on, the relay will activate.
The relay will most likely have 3 different types of remaining terminals; common, normally open, and normally closed. You will be using a pair of the 1st two types.
Cut the plug off of the AC unit while leaving some wire to work with. Strip it back and hook the black wire to one of the common terminals and the white wire to the other. Leave the green ground a little long and not connected yet.
Then cut the plug end off of the AC cord and connect the black wire and white wire to the normally open terminals while matching them up to the wires on the common terminals. White to white and black to black.
Or you can just cut both ends off of an extention cord and use them on the relay. You could then plug the ac unit into the plug on the relay and not have to cut the cord on the ac.
It's a little early, and I am a little short on time, so forgive the slight "skatter" in the procedure.
