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1) On the installation manual that is located on the Jenn Air website shows that this model is a combination of 120 & 240 volts.
See link shown below for this model:
See page number 4 shown on the link below for the electrical spec's:
2) The black and red wires are for the 240 volt connection. The white wire is the neutral wire and this is required for the 120 volt portion which powers the clock, timer and light. The ground wire is the equipment grounding conductor.
3) The circuit required for this model is a dedicated 240 volt circuit using a 20 amp double pole circuit breaker in the electrical panel. The circuit needs to be a 4 wire circuit comprised of 2 hots, 1 neutral and 1 equipment grounding conductor.
4) Shame on Jenn Air or the sales person not knowing their product:(
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