LG ARND203DCR4 Installation Manual page 32

Note:
•
Cross connecting the A and B terminals will cause
communications errors and system malfunction.
•
Field-provided communication cable between Main ODU to
DOAS units to be 18 AWG, 4-conductor, twisted, stranded,
shielded. Ensure the communication cable shield is
properly grounded to the Main ODU chassis only. Shield
must be tied together so it is continuous and insulated to
prevent grounding against DOAS unit electrical cabinet.
Do not ground the ODU to DOAS unit communication cable
at any other point. Wiring must comply with all applicable
local and national codes.
Figure 31: Example of Power wiring and Communications Cable Schematic
Figure 32: Communications Cable Between Outdoor unit
and DOAS Unit
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Figure 17: Internal Routing in DOAS Units
Communications
Power Supply
High Voltage
(208/230V)
Power Line (1Ph, 60Hz, 208/230V, 3-wire)
Communication Line (18AWG, 2-wire)
Communication Line (18AWG, 2-wire)
Figure 33: Communications Cable Between Outdoor unit
and Slave Outdoor Unit
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