Connection Method And Steps For System Communication - Gree GMV-72WM/B-U Owner's Manual

(2) All communication wires of GMV5 are connected by screws.
(3) If a single communication wire is not long enough and needs to be connected, the
connected joint must be welded or pressure-welded. Do not simply twist the wires together.
4.7.4 Communication address
Auto addressing technology is adopted for GMV5 IDU and ODU. No need to set address codes
manually. Only the addresses of master unit and central control are needed to be set (address of
central control is only needed when there are multiple refrigeration systems).
When installing remote monitor or central controller, displacement on indoor units'
project codes must be made. Otherwise, there will be collision malfunction of the project codes. For
detail operation methods, please refer to the GMV5 Installation and Maintenance Manual.

4.8 Connection Method and Steps for System Communication

4.8.1 Communication connection between IDU and ODU
The centralized controller can be installed when it is necessary.
Connect IDU and ODU via terminal D1/D2 of communication wiring board. Below are the
connection graphics of single unit and modular units:
Fig.4.6.7
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GMV DC Inverter VRF