Daitsu CDV-46 Manual page 21

Fig. 5.6 Two wired controllers control multiple indoor units simultaneously
Wiring instructions:
(1) When one wired controller controls multiple indoor units simultaneously, the
wired controller can connect to any one indoor unit, but the connected indoor
unit must be the same series indoor unit. The total quantity of indoor unit
controlled by wired controller can't exceed 16 sets, and the connected indoor
unit must be within the same indoor unit's network. Wire controller must set
quantity of group control indoor units. Please refer to 5.2.3 Parameters Setting.
(2) When two wired controllers control one indoor unit, the addresses of those two
wired controllers should be different. Please refer to 5.2.3 parameter setting.
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Wired Controller CDV-46