Depending on where you are going and what voltage you will have available there may be a jumper that needs to be changed.
If you are lucky and the people in the factory were not a sleep when they assembled your WP-100 there *should* be a wiring diagram located under the top cover when you remove it.
Like I said, it should be there.
My WT550, WT405, WT1205 all had the diagrams.
Here is the diagram from the WT1205
