Fujitsu AOU48RLXFZ Design & Technical Manual page 202

Example 3 (Not good)
Branch box (primary)
Central remote
controller line
Central remote
controller
Do not connect Central remote controller to outdoor unit or indoor unit.
Always connect branch box to Central remote controller.
Example 4 (Not good)
Branch box (primary)
Central remote
controller line
Branch box (primary)
Do not connect one Central remote controllers to two refrigerant system.
Central remote
controller line
Branch box 2 (secondary)
Central remote
controller
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6. SYSTEM DESIGN