Matt Zach wrote...
Delta says they meant that if I use a phase converter, that I will void
the warranty of the shaper.

Get a copy of the warranty and see if it specifically states that. If
not, I don't think you have anything to worry about. If so, though, I'd
be obliged if you could post the relevant portion(s) of the warranty
here.

Honestly, it makes about as much sense that they would void the warranty
if you operated it without wearing pink underwear. (G)

Jim