I believe on this unit, it's strictly a 240V unit. That preattached power cord gets connected (in a suitable junction box) to your 240V feed. The white wire in your feed is unused. It needs a 30A circuit (minimum)

The thing can be run on 208 or 240V, so it's possible that's what the jumpers are for. It's uncommon to see 208 in a residence, so it's probably already set up right. You might give the GAG folks a call and see if they can provide you the information.

It requires 40A not 30A. By the way if you don't have the manual, here it is.
The inside of the lid where the jumpers are supposedly shows how to strap it. If you have the three wire cord, it's got to be set up properly. The only other configuration would have a cord with FIVE wires in it.

Here is a link that might be useful: GAG manual

That manual looks to be aimed at European electricity. The way I understand it, homes have single-phase 230 V or three-phase 400 V.

Thanks folks. So, how do you handle the neutral wire?

Cap it? Or run it to the ground?

Also, any reason to use heat resistant wire?

Cap it. No your existing wire is fine.

Hey I have the same problem--but with oven BO451-610. Oven has 3 wires, house 220 has 4 (extra white neutral). Installation manual says nothing about how to handle the extra neutral wire or going from the oven 3 wire to house 4 wire. How did you solve this?