Mark, I'm just about to leave on vacay for about 10 days, but I'm pretty sure that you have to disconnect the yellow wire from the white terminal and re-install it on the 'empty' post. You would then wire a 240v supply cord with its red, white, and black wires connected to the corresponding ones on the terminal block. If you don't get a more definitive answer, I'll take a picture of my CD-6 wiring block and send it to you when I get back on March 15th.