H-Link Ii System; Features; Specifications - Hitachi UTOPIA R32 Series Technical Catalogue

10 Electrical wiring

H-LINK II system

10.5 H-LINK II system
The H-LINK II is the wiring connection system between units.
The H-LINK II wiring system only needs:
• Two transmission wires connecting each indoor and outdoor unit for a total of 64 refrigerant cycles.
• Connection wiring for all indoor and outdoor units in series.
!
C A U T I O N
The H-LINK II system cannot be applied to the models with the old cycle, nor to units with an old transmission.

10.5.1 Features

• The total wiring length is considerably reduced compared to traditional connections.
• Only one connection is required for the wiring between the indoor and outdoor units.
• The wiring connection of the complementary central control devices is easy.
?
N O T E
CSNET WEB / CSNET Manager is centralized control system which allows the installation to be controlled remotely. It can be connected
at any point of the local corporate network, or even via the Internet.

10.5.2 Specifications

A: outdoor unit.
B: indoor unit.
C: refrigerant cycle.
D: transmission cables.
E: refrigerant piping.
• Transmission cable: 2-wire.
• Polarity of transmission cable: non-polar wire.
• The maximum number of units that can be connected is 64
outdoor units and 160 indoor units (including UTOPIA and/or
SET FREE models) per H-LINKII system.
• Maximum wiring length: total 1000 m (including CSNET
Manager 2).
• It is possible to increase the maximum wiring length up to
5000 m by using up to four PSC-5HR units.
• Recommended cable: shielded twisted pair cable, over
0.75 mm (Equivalent to KPEV-S).
2
• Voltage: 5 V DC.
!
C A U T I O N
For the H-LINK II system must use twisted shielded pair cable or shielded pair cable.
107 TCGB0136 rev.1 - 05/2021
CSNET Manager 2
10