Thanks to all for their suggestions. While the unit does come with an
installation guide, and there is also a diagram attached to the metal hose
leading out of the unit, neither was really clear (to me, in my
inexperience) what should be done with the white wire. The installation
guide says "You must use a two-wire three conductor 208/240 VAC, 60 Hertz
electrical system. A white (neutral) wire is not needed for this unit." But
that didn't tell me what to do with the white, only that it wasn't to be
connected to the unit. The wiring diagram presupposes there are only three
wires in the box and doesn't even show the white. My guess was that it could
be capped off, but I wasn't sure if that would "hurt" anything. I will call
the mfgr as suggested, to be safe.
: ding ding!!! and it only took 4 people answering!!
: all you need to know is in the instalation manual that came with it.
: > Check the wiring instructions for the new unit or call the manufacturer
: > to be absolutely certain.