Fujitsu AOU48RLXFZ Design & Technical Manual page 199

WIRING RULES
Example 1 (Not good)
Transmission line
Branch box (secondary)
Do not connect outdoor unit to secondary type branch box.
Always connect primary type branch box to outdoor unit.
Example 2 (Not good)
Branch box (primary)
Do not interconnect primary type branch boxes.
Only 1 primary type branch box can be connected in 1 multi system.
Example 3 (Not good)
Branch box (primary)
Transmission line
Do not interconnect indoor units.
Always connect branch box to indoor unit.
Transmission line
Branch box (primary)
- (06 - 45) -
6. SYSTEM DESIGN