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ELECTRICAL WIRING
62
WARNING
!
• Indoor Unit ground wires are required for preventing electrical shock accident during current
leakage, Communication disorder by noise effect and motor current leakage (without connec-
tion to pipe).
• Don't install an individual switch or electrical outlet to disconnect each of indoor unit separately
from the power supply.
• Install the main switch that can interrupt all the power sources in an integrated manner because
this system consists of the equipment utilizing the multiple power sources.
• If there exists the possibility of reversed phase, lose phase, momentary blackout or the power
goes on and off while the product is operating, attach a reversed phase protection circuit locally.
Running the product in reversed phase may break the compressor and other parts.
[Heat Pump]
Between Indoor and Master Outdoor unit
SODU B SODU A
IDU B
IDU A
INT B
INT A
3
4
3
4
The GND terminal at the main PCB is a '-' terminal for dry contact.
It is not the point to make ground connection.
- Make sure that terminal number of master and slave outdoor units are matched.(A-A,B-B)
Master
SODU B SODU A
Outdoor Unit
3
4
SODU B SODU A
SODU B SODU A
SODU B SODU A
Master
IDU B
IDU A
INT B
INT A
Outdoor unit
Slave1
IDU B
IDU A
INT B
INT A
Outdoor Unit
Slave2
IDU B
IDU A
INT B
INT A
Outdoor Unit
Slave3
IDU B
IDU A
INT B
INT A
Outdoor Unit
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