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The diagram only show a 3 wire AC setup. Possibly from a hardwired setup or a 6-50 cord or a 10-50 cord. If I'm using a 4 wire from a 4-50 the hot leads are red and black and the neutral is white. The picture should clarify that the neutral is not to be used as you need both 120 V AC hot lines (red and black) to make up the 240 VAC potential.
I had the same issue with the 5/16" screws not fitting through the PCBA holes. I am certain I'm using the correct screws as they thread fully into the metal standoffs. This seems odd, if I need to drill out the PCBA to make this fit.