56
Outdoor Unit
Power supply switch
(switch fuse)
3 phase 4 wires power line(R, S, T, N)
Transmission line (3 line): wired remote control
Single phase of power supply line(L, N)
Transmission line (2 shield line):
between outdoor unit and outdoor unit
Transmission line (2 shield line):
between indoor unit and outdoor unit
Between indoor and main outdoor unit
Between main outdoor and sub outdoor unit
Indoor
unit
Outdoor
unit
Central
controller
Indoor
unit
Outdoor
unit
Central
controller
Main
outdoor unit
Main
outdoor
unit
Sub
outdoor unit
3 phase 4 wires
power supply
60Hz 380V
Power supply
1 phase 60Hz
220V
Pull box
Main power supply line
Branch line
The GND terminal is a '–' terminal for the central controller, not ground line
Sub
Main
◆
Example Connection of Transmission Cable
2 Outdoor units
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.