But before I start, I still really need help from our community to confirm the connections in the diagram is correct. The reason I am asking is because when I open up the unit, I saw the shield wire hooked up to X4 and H4 which contradicts to the diagram.OK.This diagram show S1 and S2, the connection still the same, parallel=120V, in series=240V
http://daitronglobal.com/products/power/image/910_3.gif