Don't know what type of unit this is. It looks like ductless or ducted mini splits with a condensing unit. So ACCU-1 would be the condensing unit. Then it looks like you have 6 heads AC-3-1 to AC-3_6
Most straight Mini split (one condenser and one indoor unit) some are wired with separate power to each unit and some the indoor unit is fed from the condenser.
I have not wired any units with multiple heads, but I suspect they would have their own power supply separate from the condenser