http://www.delfield.com/docs/uploaded/del/manuals/archive/dm6000.pdf
go to this site. It is your manual for your unit and it has a diagram in it. check it out. The power switch just breaks the power side of the incoming power. The transformer is a/c so it is not polarity sensitive. Usually the transformer will have a black and white wires on one side to indicate the high voltage side.. I have a ladder diagram scanned from the original manual but it is no different that the web site.
Hope this helps.
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