Hitachi YUTAKI S Series Technical Catalogue page 121

9 Electrical and control settings
Transmission wiring
9.4 Transmission wiring
9.4.1 YUTAKI units
• This is the transmission wiring between outdoor and indoor unit, ATW-RTU(*) communication and Central devices.
• The transmission is wired to terminals 1-2.
• The H-LINK II wiring system requires only two transmission cables that connect the indoor unit and the outdoor unit
in case of split system and also connect the indoor unit with ATW-RTU(*) or central devices like ATW-TAG-02, ATW-
KNX-02 and ATW-MBS-02.
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N O T E
(*) Except ATW-RTU-04 (wired to terminals 13-14).
• 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, with a length of less than 300m
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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N O T E
This section applies only to split systems (Outdoor unit + Indoor unit). It does not apply to YUTAKI M.
113 TCGB0123 rev.2 - 10/2019
Indoor unit
1 2
Outdoor unit/ ATW-RTU(*) / Central Devices
1 2
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