120/240 hookup for Jenn-Air cooktop
I am replacing an older Jenn-Air cooktop (mod # C-201) with a new Jenn-Air cooktop (mod # JED8430). My problem/concern is that the 120/240 circuit feeding the cooktop is fed via Greenfied conduit housing 4 wires [ (2) black, (1) white (1) bare copper ]. The new cooktop attached junction box has 4 wires [ (1) black, (1) red, (1) white and (1) green. It seems intuitive enough to me that white connects to white as a neutral and that green connects to bare copper as an appliance ground. BTW, white and bare copper are bonded together at the service panel, i.e. continuity is read between the 2 wires as well as at the neutral and ground bus bars. No problem so far. My concern is the proper connection of the two "hot" black wires which normally would be (1) black and (1) red. Since the two hot wires are phase reversed and together provide the 240v energy I'm concerned that if they are incorrectly connected backwards some form of polarity problem may exist which could cause damage to the unit.
A related issue is that the exhaust fan motor (120v) is fed from Hot wire L1 and the neutral wire (white). I don't know which of the (2) blacks is L1 and which is L2. At the time the fan is working and drawing current from L1 some imbalance would exist between L1 and L2 which might imply that it is critical to connect the two correctly. It may well be that if I wire L1 and L2 backwards the fan may not work or worse, some damage to the unit might occur.
I would be most grateful for your advice on this matter.