Gree GMV-680WM/E-X Manuel D'utilisateur page 47

4.7.2 Communication connection between IDU and wired controller
There are four kinds of connection between IDU and wired controller, as shown below:
Fig. 4.7.3 One wired controller controls one IDU
Fig. 4.7.5 One wired controller controls multiple IDUs
Fig. 4.7.6 Two wired controllers control multiple IDUs
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Fig. 4.7.4 Two wired controllers control
one IDU
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GMV DC Inverter VRF