Gree GMVVQ224WM/C-X Owner's Manual page 54

(2) If a communication wire is not long enough and needs to be connected with another wire by
peeling away its outer layer, crimp connection or soldering connection must be adopted.
3.9.4 Communication Address Setting
The indoor unit and outdoor unit adopt automatic addressing technology. It is not necessary to
manually set the address code. It only needs to set the main module and centralized control address
(set it when centralized control of multiple refrigeration systems is required).
3.9.5 Connection Methods and Procedure of Communication System
Communication between indoor, mode exchange box and outdoor units is connected via terminal
D1/D2 on communication wiring board. Connection method for single-module and multi-module
systems is shown below:
GMV Heat Recovery DC Inverter VRF
Fig.3.9.7
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