I am in the UK - but I found this...
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A proper 4 wire installation will look like this:
The red and black wires (both supply 120V) must be attached on the left and right side of the terminal block.
The white wire (neutral) and the internal green wire (ground) must be attached in the middle of the terminal block.
The power cord's green wire (ground) must be attached to the left on the housing where the green screw is located.
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From here...
http://www.samsung.com/us/support/supportOwnersHowToGuidePopup.do?howto_guide_seq=641&prd_ia_cd=N0000215&map_seq=19410®Dt=20080415090349&page_gb=D&model_name=DV665JW&type_ia_cd=N0000213&subtype_ia_cd=N0000215&row_index=3
But it may be best (safest) for you to call in an appliance engineer...
Take care...
Peccavi
January 2013