Hitachi YUTAKI ATW-YCC-03 Installation And Operation Manual page 24

ELECTRICAL AND CONTROL SETTINGS
The H-LINK II connection must be done as it is shown in the figure below:
• The H-LINK wiring system requires only two transmission cables that connect the indoor unit and the outdoor unit.
• Use twist pair wires (0.75 mm²) for operation wiring between outdoor unit and indoor unit. The wiring must consist of 2-core wires
(Do not use wire with more than 3 cores).
• Use shielded wires for intermediate wiring to protect the units from noise interference. Total H-LINK circuit length shall not
exceed 1000m and a size in compliance with local codes.
• In the event that a conduit tube for field-wiring is not used, fix rubber bushes to the panel with adhesive.
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C A U T I O N
Ensure that the transmission wiring is not wrongly connected to any live part that could be damaged the PCB.
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LCD unit controller (PC-ARFH2E) connection
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C A U T I O N
It is mandatory to install the unit controller (PC-ARFH2E) in the service cover.
Connection for the LCD unit controller PC-ARFH2E should be done on the Terminal Board 2 of the YUTAKI CASCADE
CONTROLLER as shown in the next figure:
For this purpose, a H-LINK cable (accessory) is necessary.
The torque for the tightening of the screws of each Terminal board is explained in the table below
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Safety instructions
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D A N G E R
• Do not connect the power supply to the unit before all connections have been previously done.
• Do not connect or adjust any wiring or connections unless the main power switch is OFF.
• When using more than one power source, check and ensure that all of them are turned OFF before operating the unit.
• Avoid wiring installation in contact with the refrigerant pipes, water pipes, edges of plates and electrical components inside the unit to
prevent damage, which may cause electric shock or short circuit.
18 PMML0581 rev.1 - 02/2023 - 1000011627
YUTAKI unit
Terminal Board 2
CASCADE CONTROLLER
Terminal Board 2
Terminal board
TB1
TB2
YUTAKI CASCADE CONTROLLER
Terminal Board 2
PC-ARFH2E
Tightening Torque (Nm/cm )
2
2.0~2.5
1.0~1.3