Hitachi RAM-20MQ Installation & Maintenance Manual page 25

(2) Wiring Instruction
●The power source cord and transmission cable wiring, please follow the following instruction to implement.
1) The outdoor unit's power source cord must be wired separately, and each outdoor unit must have individual high-speed
type earth leakage breaker (ELB) and the power switch.
2) Connect the power supply wiring to each indoor unit group which is connected to the same outdoor unit. And install
individual earth leakage breaker (ELB) and the power switch to each indoor unit group.
3) The transmission cable must be connected to the unit of the same refrigerant cycle. If refrigerant piping and the
transmission cable connected with a different refrigeration cycle, abnormality will occur.
4) The transmission cable between indoor and outdoor units and the transmission cable between indoor units (DC5V), use
twist-pair cable with shield over 0.75mm
5) The 2-core wire should be used for the transmission cable of the connection. (Do not use 3-core wire or over.)
Wiring Example：
＜ 380V 60Hz ＞
< 380V 60Hz>
◎ Main Switch
◎主開關
◎ Fuse
◎保險絲
◎漏電斷路器 ELB
◎ Earth Leakage Breaker
◎ Main Switch ◎主開關
3 4W 380V
60Hz
◎ Fuse
◎保險絲
◎漏電斷路器
◎ Earth Leakage Breaker
3 4W 380V
60Hz ◎ Main Switch
◎主開關
◎ Fuse ◎保險絲
◎漏電斷路器
◎ Earth Leakage Breaker
1 230V
＜ 230V 60Hz ＞ < 230V 60Hz>
◎ Main Switch ◎主開關
◎ Fuse
◎保險絲
◎漏電斷路器 ELB
◎ Earth Leakage Breaker
◎ Main Switch
◎主開關
3 230V
60Hz
◎ Fuse ◎保險絲
◎ Earth Leakage Breaker ◎漏電斷路器
3 230V
60Hz
◎ Main Switch ◎主開關
◎ Fuse
◎保險絲
◎ Earth Leakage Breaker ◎漏電斷路器
1 230V
2
. Additionally, the total length must be less than 1000m.
室外機 1/3 (親
Master (A)
TB 機)
1
L L L N 1 2
Electric Box 配電箱
ELB
L L N
NO.0 Indoor Unit 0 號室內機
Controller
◎控制器線
Wire
ELB
☆遙控器
Remote
Controller
室外機 1/3 (親
Master (A)
TB
機)
1
R S T 1 2
配電箱
Electric Box
ELB
L L N
0 號室內機
NO.0 Indoor Unit
Controller
◎控制器線
Wire
ELB Remote
☆遙控器
Controller
室外機 2/3 (子
TB
機)
3 4 L L L
接地
Earth Wire
配電箱
Electric Box
L L N
1 號室內機
NO.1 Indoor Unit
Controller
◎控制器線
Wire
Remote
☆遙控器
Controller
TB
1
3 4 R S T
接地
Earth Wire
配電箱
Electric Box
L L N
NO.1 Indoor Unit 1 號室內機
Controller
◎控制器線
Wire
Remote
☆遙控器
Controller
25
Slave (B)
1
N 1 2 3 4
接地
Earth Wire
TB
：端子台
Terminal Board
PCB ：基板
PC Board
：現地配線 Field Wiring
：操作回路連接電線 DC5V
Transmission cable of the connection DC 5V
Field Supply
◎ ：現地準備
☆ ：另購品
Option
室外機 2/3 (子
Slave (B)
機)
1 2 3 4
接地
Earth Wire
TB ：端子台
Terminal Board
PCB
：基板
PC Board
：現地配線
Field Wiring
：操作回路連接電線 DC5V
Transmission cable of the connection DC 5V
◎ ：現地準備 Field Supply
☆ ：另購品
Option