My pressure switch had melt down have a new one in place I nned to know how to hook the 220 power too it

There is a diagram right inside the cover.

Line goes to the two outside screws (1 & 3)
The motor load goes to the two inside screws (2 & 4)

Here is the instructions wiring diagram: http://static.schneider-electric.us/docs/Machine%20Control/Pressure-Float-Vacuum%20Switches/Pressure%20Switches-Water%20and%20Air/9013F/65013-005-39.pdf