The way to connect it would be to simply connect like to like.
The US system is ..
RED = HOT
BLACK = HOT
WHITE = NEUTRAL
Unsheathed = Earth connection
The voltage between RED and BLACK is 240V, the Voltage between WHITE and BLACK is 120V, the voltage between RED and WHITE is 120V.
If you have any doubts, I strongly urge you to call in an electrician.
OK, I have edited my post as it was WRONG, Information I have believed to be accurate for many years I now know to have been incorrect regarding the use of BLACK and WHITE cores in US Domestic, and I assume Office Installations. It is 12 years since I was last in the US (In a work capacity) so I have not had the opportunity before to discover I had been given incorrect information..or I heard it incorrectly..I apologise for this confusion as I am fully aware of the consequences.