Help, 120 vs 220/240
Your ductless system will require 220-volts to operate.  Anything else will damage the unit.  The conventional receptacle near by is of no help.  Besides, even is it was a dedicated circuit and could be converted, you still need a 110-volt receptacle near by for service.   You will need to bring a new 12-Gauge 2-wire circuit to the location.  Good luck. You are gonna love the ductless system.