Gree GMVVQ224WM/C-X Owner's Manual page 56

Fig.3.9.9 Connection of communication for multi-module system
NOTES!
(1) As for modular indoor unit, if there are multiple outdoor unit modules, the master module
must be the first outdoor unit module on the communication line, and it must not connect to
the indoor unit (main module is set by SA8 of indoor unit main board).
(2) As for modular outdoor unit, if there are multiple outdoor unit modules, the indoor unit must
be connected to the last outdoor unit's slave module (slave unit is set by SA8 of indoor unit
main board).
(3) The communication line and the power cord must be routed separately to avoid interference.
(4) The communication line must be of suitable length and must not be connected.
GMV Heat Recovery DC Inverter VRF
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