An afterthought. Looking again at the schematic, the "starter motor coil" is clearly not a contactor, and is after the contacts a contactor would open and close, so that won't work at all. So it is probably just what the name implies. Which is not needed with the actual dp motor in question.That's a good point. Also known as a contactor. Needed for 480 Vac, but not for 240 Vac.