System Communication - Gree Ultra Heat GMV Multi VRF Series Owner's Manual

4.7 System Communication

4.7.1 Communication system include:
(1) Communication among outdoor basic modules.
(2) Communication between ODU and IDU.
(3) Communication among IDUs.
(4) Communication between IDU and wired controller.
(5) Connection between IDU and light board receiver.
Fig. 33
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Ultra Heat GMV Multi VRF