Does anyone have a terminal schematic for an Ark Les 271-97-309 rotary switch, off-low-med-high?

I'm working on a three speed fan coil that has been "repaired" by one or more previous techs, and there is no documentation, so I'd like to see if what they did makes sense, or if I have to get it to make sense.

Thanks for any help you can offer.

The terminals are marked: N, U, 1, 2, and 3.