H-Link Ii System; Application; Features; Specifications - Hitachi RASC-4HNPE Service Manual

4 Electrical and control settings

H-LINK II system

4.7 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 RASC unit for a total of 64 refrigerant cycles.
• Connection wiring for all indoor and RASC units in series.

4.7.1 Application

The H-LINK II system can be applied to the following models:
Indoor unit
System Free
!
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.

4.7.2 Features

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

4.7.3 Specifications

• Transmission cable: 2-wire.
• Polarity of transmission cable: non-polar wire.
• Maximum number of units that can be connected: 64
RASC units and 160 indoor units per H-LINK II system.
• Maximum wiring length: total 1000 m (including CSNET
WEB or CSNET Manager).
• 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.
70 SMGB0091 rev.2 - 11/2015
RCI
RCIM
RCD
RPI
RPIM
RPK
RPF
RPFI
RPC
RASC unit
RASC-(4-10)HNPE
RASC unit
Indoor unit
Refrigerant cycle CSNET WEB /
Transmission cables
CSNET Manager
Refrigerant piping