D.C. Inverter Multi VRF Modular
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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).
4.7.2 Communication connection between IDU and wired controller
There are 4 kinds of connection between IDU and wired controller, as shown below:
Fig.49 One wired controller controls one IDU Fig.50 Two wired controllers control one IDU
Fig.51 One wired controller controls multiple IDUs
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