Elecrical hook-up for cooktop

Based on your description...it appears the Viking unit may NOT comply with UL and the NEC....but implies that some local Codes may permit the suggested connection...and it may indeed be permitted - if the unit actually draws straight 240 and does not require a neutral for 120 volts (some cooktops do need the neutral for 120 volt control switches...such as your Jennair). Code now requires that new 120/240 units that require the neutral (your Viking unit states that it does not) be a 4 wire assmebly....and your unit MAY be an exception to this requirement.

Under those conditions...then it more then likely CAN be connected as you (and Viking) suggest - black to black, red to red,green to white...and insure that the junction box is indeed well grounded to the supply bare ground wire - so that the metal flex will serve as a supplemental ground to the cook-top.The only other consideration will then be - IS the exisiting wire size and breaker that used to supply the Jennair correct for the new unit..? And if so - then you should be all set with your suggested hook-up...but without electrical nameplate data for both units for comparison...I have no way to determine that....both companies make several different models with different power supply requirements.

If the electrical data is compatible between the two units...then you should be all set as suggested - without having to rewire the cooktop.

Hope this helps...please follow-up if you need more details or have new information for me concerning this cooktop.