I am replacing an older Jenn-Air cooktop (model C201) with a newer Jenn-Air 8430. My problem is the conduit running from the house into the old unit has 3 wires, 1 black, 1 white, 1 bare copper. The new unit has 2 black wires, 1 white and 1 green. I assume white goes to white as neutral, green goes to bare copper as a ground. My problem is how to connect the 2 black wires on the new unit to just 1 black wire on the supply line. Any help would be greatly appreciated.