GMV DC Inverter VRF
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(1) 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 SA8 of the outdoor
main board).
(2) For modular outdoor units, if there are multiple outdoor modules, then indoor units must be connected with the
last slave module of ODU (slave module is set by SA8 of the outdoor main board).
(3) Communication wire and power cord must be separated.
(4) Communication wire must be of proper length. Extension is not allowed.
(5) IDUs must be connected in series. The last IDU must be connected with the communication matched
resistance (supplied in the list of ODU spare parts).
4.8.2 Communication connection between IDU and wired controller
There are 4 kinds of connection between IDU and wired controller, as shown below:
Fig.53 one wired controller controls one IDU Fig.54 Two wired controllers controls one IDU
Fig.55 one wired controller controls multiple IDUs
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