mine is a s1 unit with open kitchen... and i got a system4 inverter + system1 non-inverter... both toshiba... yup 5 x indoor units

- 24 BTU non-inverter in foyer
- 16 BTU inverter in corridor directly opposite open kitchen
- 13 BTU inverter in MBR
- 10 BTU inverter in Bdrm 2
- 10 BTU inverter in Bdrm 3

trunking quite straightforward...

- 24 BTU yard -> kitchen -> foyer
- inverter units yard -> MBR bathroom -> Bdrm2 -> Bdrm3 -> corridor wall outside Bdrm3