[Siecje]

That's a lot of lines going to the outdoor unit.

Is there two per indoor head?

[matthiaswh]

It looks like that unit may have 3 indoor heads. Two lines per head. Power to each head. Power to the outdoor unit.

[bluGill]

Looks like it. I'd suggest anyone looking at a system like that install at least 2 separate outdoor units. That way if one breaks the other can still work - and most of the year it will be powerful enough to handle the whole house (some rooms will be a little uncomfortable but bearable)

[verelo]

This is correct, 3 heads. One on each level of the house.