I had a similar unit to connect last year,& although not a Sansui, it was Japanese made.
Some clown A/C co. had installed it in a small server room
115(yes)volt, it had no NRTL label, and the diagrams supplied showed the grounded conductor being switched. 4 wires (@ full voltage) ran from the condenser to the evaporator.
The unit never worked well, and I had 4 callbacks (none of which were problems with my wiring) when it failed repeatedly, one time nearly cooking about $100K in equipment.
I'd never hook up another one of these pieces of junk...S