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• Example of Electrical Wiring
The following figure shows an example of electrical wiring around the Switch Boxes.
Outdoor Unit
Power Supply
220-240V~ 50Hz
220V~ 60Hz
ELB
1
Earth Leakage
Breaker
S
2
Main Switch
4
NOTES:
1. Do not apply excessive voltage to the communication cable DC5V (non-polarity) between the outdoor
unit and the Switch Box , between the Switch Box and the indoor unit or between Switch Boxes.
2. Use 2-Conductor shielded communication cable for the communication cable. (Do not use 3-Conductor
cable or over.)
3. Connect the communication cable for the outdoor unit to terminals "1" and "2" on TB2 in the Switch Box.
4. Connect the communication cable for the indoor unit exclusively for cooling operation to the terminal "1"
and "2" on TB2 in the Switch Box.
5. For a Switch Box in the same refrigerant cycle, an electrical power supply can be supplied by one main
switch.
6. Do not connect the power supply line (220-240V) to the terminal block for transmission line.
7. Connect the ground wiring for the outdoor/indoor units and Switch Box. When ground resistance is less
than 100 ohms, ground wiring work should be performed by the qualified electrician.
8. Do not run the communication cables along with power supply wiring in the Switch Box.
Separate communication cables from the power supply wirings.
6.4 Setting of DIP Switches
DSWs on the PCB1 are set before shipping as
shown below and no setting is required.
• DSW1
ON
1 2 3 4 5 6
● When introducing high voltage
to terminals 1 and 2 of TB2,
the fuse on the PCB is open.
In such a case, first reconnect
the wiring correctly to TB2, and
then adjust the number 1 pin to
ON for DSW4 and DSW5.
Outdoor Unit
Connect the operating line for the
outdoor unit to the terminal
"1" and "2" of TB2 on the Switch Box.
TB2
1
2
3
4
Switch Box
TB1
TB2
3
L
N
1
2
1
Pull Box
5
Operating Line
TB2
(Non-pole, DC5V)
2
1
Indoor Unit
or Water Module
• DSW4
• DSW5
ON
ON
1 2
Switch Box
TB1
TB2
3
3
4
L
N
1
2
3
4
1
TB2
B
A
2
1
B
A
Wired
Wired
Indoor Unit
Controller
Controller
In case that the multiple indoor units
are connected to the same Switch
Box, the operation mode (cooling/
heating) for the indoor units will be
the same.
The "n" mark indicates the position of DIP
switches. Figures show setting before shipment.
All indoor and outdoor units must be shut
1 2
down prior to attempting to make DIP Switch
adjustments, otherwise, the settings will not
take effect.
ON
1
2
OFF
18
Connect the operating line for the
indoor unit (exclusive use of cooling
operation) to the terminal "1" and "2"
of TB2 on the Switch Box.
Wired Controller
TB2
TB2
2
1
B
A
2
1
B
A
Indoor Unit
Wired
Cooling Only Indoor Unit Heating Only Water Module
Controller
NOTE
Wired Controller
TB2
2
1
B
A
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