52 Outdoor Unit
Electrical Wiring
◆ Example Connection of Transmission Cable
3 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.
• All wiring, components and materials to be procured on the site must comply with the applicable local
and national codes.
Power supply switch
(switch fuse)
3 phase 4 wires power line(R, S, T)
Transmission line (3 line): wired remote control
Single phase of power supply line
Transmission line (2 shield line):
between outdoor unit and outdoor unit
3 phase 4 wires
power supply
Single phase
power supply
Main
Sub1
Sub2
Transmission line (2 shield line):
between indoor unit and outdoor unit
■ When the power source is connected
In series between the units.
HR unit HR unit
Power supply switch
(switch fuse)
3 phase 4 wires
power supply
Single phase
power supply
Main
Sub1
Sub2
HR unit HR unit
■ When the power source is supplied to
Each outdoor unit individually.
Between indoor and main outdoor unit Between main outdoor and sub outdoor unit
Indoor
unit
Outdoor
unit
Central
controller
Indoor
unit
Outdoor
unit
Outdoor
unit
Central
controller
Main
outdoor unit
Main
outdoor
unit
Sub 1
outdoor
unit
Outdoor
unit
Sub 2
outdoor
unit
The GND terminal is a '–' terminal for the central controller, not ground line
HR unit
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