Hitachi RAS-4-HNPE - H-LINK II System; Features; Specifications

4. Electrical wiring
101
SMGB0079 rev.0 - 01/2013
4
4.5 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.
4.5.1 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isa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.
4.5.2 Specications
A: outdoor unit.
B: indoor unit.
C: refrigerant cycle.
D: transmission cables.
E: refrigerant piping.
A refrigerant cycle
Outdoor unit
Indoor units
Transmission cables
Refrigerant piping
Cable features
• Transmission cable: 2-wire.
• Polarity of transmission cable: non-polar wire.
• Maximum number of indoor units that can be connected: 4 units per cycle and 160 units per H-LINK II system.
• Maximum wiring length: total 1000 m (including CSNET WEB).
• 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
2
(Equivalent to KPEV-S).
• Voltage: 5V DC.
C A U T I O N
FortheH-LINKIIsystemitmustbeusedtwistedshieldedpaircableorshieldedpaircable.