GMV5 D.C INVERTER MULTI VRF SERVICE MANUAL
82
NOTICE!
â‘ If there are multiple modules for the modular ODU, the master unit must be the first ODU
module on the communication cable and cannot be connected to the IDU. (The master unit is
set by SA8 on the main board of the ODU.)
â‘¡ If there are multiple modules for the modular ODU, the IDU must be connected to the slave
module of the last ODU. (The slave unit is set by SA8 on the main board of the ODU.)
â‘¢ The communication cable and power cable must be laid separately to avoid interference.
â‘£ The communication cable must be long enough to avoid joints.
⑤ Indoor units must be connected in series. The last IDU shall be connected to a matching resistor
(placed in the package of the ODU).
7.3.3.2 Communication cable connection between the IDU and wired controller
Connection modes for the communication cable between the IDU and wired controller are shown in
the following figures.
One wired controller Two wired controllers
controlling one IDU controlling one IDU
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