I just had to help wire a similar unit only made by Samsung. I never found a wiring diagram as good as the one for the Gree. Everything showed line neutral but is really 208-230 v. Needed breaker for outdoor unit,50 amp and then one breaker for indoor units as they are only 27 watts. comms wire daisy chained. The difference is some box in basement called heat recovery unit, not sure what it does

Not HVAC guy just the electrician on this, The HVAC guy wanted to wire it like a regular old mini split.

Install manual showed power and comms similar to this one. Glad I read this thread
