Yes, white off and on the center terminal. As for running better, I suppose. Kinda wishy washy on that. 120 Vac/230 vac, its just a duty cycle thing.

Now, yes the machine will run if connected wrong, however, it'll heat in the wrong places and takeout the $$$ horizontal mother board.

So while its apart, best to take the plastic end of a screw driver and tap in the top 2 boards. I like to RTV (automotive silicone) the edges of those boards in (prevents them from comming out)

With a philips driver, hand tighten the 2 screws on top of that black cover. (Just hand tight (maybe 13 inch lbs) Tighten, and ltighten and red locktite the brass nuts behind the output studs