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• Example of Electrical Wiring
The following figure shows an example of electrical wiring around the Switch Boxes.
Outdoor Unit
TB2
O.U.-O.U.
Connect
1
2
3
4
communication cable
from outdoor unit
to the outdoor
terminal block (TB2)
in Switch Box.
Switch Box
TB1
Power
Supply
R/
S/
L1
L2
Earth
Outdoor Unit
Main Switch
Leakage
and Fuse
Power Supply
Breaker
1~ 220-240V/50Hz
S
ELB
1~ 220V/60Hz
WC
Power Supply Wiring
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 wirings in the Switch Box.
Separate communication cables from the power supply wirings.
A to L indicate the Indoor Unit number.
HCHM-N08X
HCHM-N04X
PCB1
PCB2
TB3
TB4
TB3
TB2
Indoor
Indoor
Indoor
Outdoor
A
B
C
D
E
F
1 2
3
4
5
6 7 8 9 10
3
4
5
6
TB2
TB2
WC
B A 2 1
B A 2 1
Indoor Unit A
Indoor Unit B
or Water Module A
or Water Module B
Communication Cable
(Non-Polarity)
When multiple indoor units are connected to the same Switch Box
(DC5V)
the operation mode (cooling/heating) for the indoor units will be the same.
WC: Wired Controller
HCHM-N12X
PCB3
PCB4
TB4
TB3
TB4
TB3
Indoor
Indoor
Indoor
Indoor
G
H
I
J
K
L
M
7
8 9
10
3
4
5
6 7 8 9 10
3
Communication Cable
(Non-Polarity)
(DC5V)
TB2
WC
WC
B A 2 1
Indoor Unit P
1
23
HCHM-N16X
Switch Box
PCB1
TB3
TB2
TB4
Indoor
Outdoor
A
Indoor
1 2
3
4
5
N
O
P
4
5
6 7 8 9 10
Connect communication
cable from cooling only
indoor unit to the outdoor
terminal block (TB2) in
Switch Box.
TB2
B A 2 1
WC
Indoor Unit P
2
Cooling Only Indoor Unit
TB4
Indoor
B
C
6
7
8
TB2
TB2
B A 2 1
WC
B A 2 1
Heating Only Water Module
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