Gree GMVVQ224WM/C-X Owner's Manual page 52

3.9.3Communication method
Communication bus connection between indoor unit，mode exchange box and outdoor unit must
be connected in series, rather than star connection; the endmost indoor unit of communication bus
between indoor unit，mode exchange box and outdoor unit must connect with the communication
matching resistor(in the outdoor unit plastic bag); The fresh air indoor unit is not recommended to be
set as the main indoor unit.
Connection of communication wire
(1) Communication wires of heat recovery units must be connected in series instead of in star
mode;
GMV Heat Recovery DC Inverter VRF
Fig.3.9.3
Fig.3.9.4
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