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• Example of Electrical Wiring
The following figure shows an example of electrical wiring around the CH-Boxes.
Outdoor Unit
TB2
H-LINK
1
2
1
2
Earth
Outdoor Unit
Leakage
Main Switch
and Fuse
Power Supply
Breaker
1~/N 230V/50Hz
ELB
1~/N 220-240V/50Hz
1~/N 220V/60Hz
For Mexico
1~, 208-230V/50Hz
Power Supply Wiring
4
model only.
1~, 220V/60Hz
NOTES:
1. Do not apply excessive voltage to the communication cable DC5V (non-polarity) between the outdoor
unit and the CH-Box, between the CH-Box and the indoor unit or between CH-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 CH-Box.
4. Connect the communication cable for the indoor unit exclusively for cooling operation to the terminal "1"
and "2" on TB2 in the CH-Box.
5. For a CH-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/220V/230V) to the terminal block for transmission line.
7. Connect the ground wiring for the outdoor/indoor units and CH-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 CH-Box.
Separate communication cables from the power supply wirings.
22
O.U.-O.U.
Connect
3
4
communication cable
from outdoor unit
to the outdoor
terminal block (TB2)
in CH-Box.
CH-Box
CH-AP04MSSX
PCB1
TB3
TB4
TB1
TB2
Indoor
Indoor
Power
3
Outdoor
Supply
A
B
C
D
R/
S/
1 2
3
4
5
6
7 8 9 10
L1
L2
S
TB2
WC
WC
B
A 2
1
B
Indoor Unit A
Indoor Unit B
Communication Cable
(Non-Polarity)
(DC5V)
A to L indicate the Indoor Unit number.
CH-AP12MSSX
CH-AP08MSSX
PCB2
PCB3
TB3
TB4
TB3
TB4
Indoor
Indoor
Indoor
Indoor
E
F
G
H
I
J
K
3
4
5
6
7 8 9 10
3
4
5
6
7 8 9 10
5
Communication Cable
(Non-Polarity)
(DC5V)
TB2
WC
A 2
1
B
A 2
1
Indoor Unit L
When multiple indoor units are connected to the same branch of CH-Box,
the operation mode (cooling/heating) for the indoor units will be the same.
WC: Wired Controller
CH-AP16MSSX
CH-Box
PCB4
TB2
TB3
TB4
Outdoor
Indoor
Indoor
3
1 2
L
M
N
O
P
3
4
5
6
7 8 9 10
TB2
TB2
WC
B
A 2
1
Indoor Unit L
1
2
PCB1
TB3
TB4
Indoor
Indoor
A
B
C
3
4
5
6
7 8
Connect communication
cable from cooling only
indoor unit to the outdoor
terminal block (TB2) in
CH-Box.
TB2
WC
B
A 2
1
Cooling Only Indoor Unit
P5417025-rev.1
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