General Considerations - Hitachi UTOPIA R32 Series Installation And Operation Manual

12.1 General considerations

The H-LINK II system can not be applied to the cycle with the old H-LINK model.
1 Application
The H-LINK II connecting each indoor unit and outdoor unit for up to 64 refrigerant cycles, and
connecting wires for all indoor units and all outdoor units in series.
2 Specifications
✓ Transmission Wire: 2-Wire.
✓ Polarity of transmission wire: Non-Polar wire.
✓ Maximum number of outdoor units to be connected: 64 units per H-LINK II system.
✓ Recommended number of indoor units to be connected: 64 Units per H-LINK II system.
✓ Maximum wiring length: total 1000 m (including CS-NET). In case that the total wiring length
is longer than 1000 m, contact the Hitachi dealer.
✓ Recommended cable: twist pair cable with shield, over 0.75 mm2 (Equivalent to KPEV-S).
✓ Voltage: 5 V.
Do not make a wiring in a loop.
3 DSW setting of indoor PCB and outdoor PCB.
It is recommended to set dip switches of every indoor unit and outdoor unit.
PMEN0654 rev.0 - 12/2023
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