Gree GMV-V72W/A-F Owner's Manual page 39

Ultra Heat GMV Multi VRF
Connection of communication for multi refrigeration systems:
(1) Communication wire and power cord must be separated.
(2) Communication wire must be of proper length. Extension is not allowed.
(3) IDUs must be connected in series. The last IDU D1/D2 must be connected with the communication matched
resistance (supplied in the list of ODU spare parts). The ODU D1/D2 must be connected with the communication
matched resistance (installed before factory).
(4) For modular outdoor units, if there are multiple outdoor modules, then the master unit must be the first outdoor
module on the communication wire and should not connect with IDU (master unit is set by S7 of the outdoor main board).
Fig.41
Fig.42
35