Gree GMV-Y96WM/A-F(U) Owner's Manual page 38

4.8.3 Communication connection of central controlling units
NOTICE! The centralized controller can be installed when it is necessary.
Port connection G1 and G2 on the wiring board XT2 of master unit among each multi VRF
system (see below)
Fig.4.8.6
34
Photovoltaic Multi VRF