LG Multi V ARUB Series Installation Manual page 51

N Example Connection of Transmission Cable
2 Outdoor Units
I When the power source is connected
In series between the units.
3 phase 4 wires
power supply
Single phase
power supply
I When the power source is supplied to
Each outdoor unit individually.
3 phase 4 wires
power supply
Single phase
power supply
WARNING
• Indoor unit ground lines are required for preventing electrical shock accident in current leakage,
transmission disorder by noise effect and motor current leakage (without connection to pipe).
• Don't install an individual switch or electrical outlet to disconnect each of indoor unit separately from the
power supply.
• All wiring, components and materials to be procured on the site must comply with the applicable local and
national codes.
Between indoor and main outdoor unit
Indoor Outdoor
unit unit controller
HR unit
The GND terminal is a '–' terminal for the central controller, not ground line
Power supply switch
(switch fuse)
HR unit
Power supply switch
(switch fuse)
HR unit
Central
Main
outdoor unit
3 phase 4 wires power line(R, S, T)
Main
Transmission line (3 line): wired remote control
Sub
Single phase of power supply line
Transmission line (2 shield line):
between outdoor unit and outdoor unit
Transmission line (2 shield line):
between indoor unit and outdoor unit
HR unit
Main
Sub
HR unit
Between main outdoor and sub outdoor unit
Indoor Outdoor
unit unit
Sub
outdoor unit
Electrical Wiring
Central
Main
controller
outdoor
unit
Installation Manual 51