Hitachi RAM-20MQ Installation & Maintenance Manual page 27

11) Wire connection port：
When the power supply is 380V, connect the power supply to TB1 of L1, L2, L3 and N;
When the power supply is 230V, connect the power supply to TB1 of R, S, T, and the earth wire should be fastened on the
power supply box.
Please connect transmission cable between outdoor and indoor unit to the terminal 1 and 2 of TB2. If there is other
connection wiring between the outdoor units in the same refrigerant system, please connect them to terminal 3 and 4.
For terminal board tightening torque, please refer the following table:
Size
M4
M5
M6
M8
M10
＊
Completely seal the conduit tube after wiring to avoid entering water.
Example:
<RAM-8MQD>
Transmission
Cable Terminal
Board
Power Supply
Φ
Connection Port 52
Tightening Torque (N-m)
1.0-1.3
2.0-2.4
4.0-5.0
9.0-11.0
18.0-23.0
PCB
1
PCB1
TB
2
TB2
TB
TB1
Transmission Cable
of the Connection
between Outdoor
and Indoor Unit
Power Supply
Terminal
1
Board
Clamp
Power Supply
Transmission Cable
of the Connection
Power Supply
Connection Port
Transmission Cable
Connection Port
27
Clamp
Earth Wire
Transmission Cable of
the Connection between
Outdoor Units
Earth Wire
Terminal
Earth Wire
Φ
52
Φ
26
Electric Box
Insulation
Sleeve
Power Supply
Connection Port Φ52
Transmission Cable
Connection Port Φ26