H-Link System - Hitachi FSG1 Series Technical Catalogue

15.4.2 H-LINK SYSTEM

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NOTE:
The H-LINK system can not be applied to the cycle
with the old model unit or the unit with old
transmission.
1. Application
The new H-LINK wiring system requires only two (2)
transmission wires connecting each indoor unit and
outdoor unit for up to 16 refrigerant cycles, and
connecting wires for all indoor units and all outdoor
units in series.
This H-LINK system can be applied to the following
models.
Indoor Unit
RCI
RCD
RPI
RPK
RPF
RPFI
RPC
2. Features
The H-LINK has the following features and
specifications:
§ Features:
- The total wiring length is remarkably reduced.
- Only one (1) connection is required for the wiring
between the indoor unit and outdoor unit.
- Easy wiring connection to the central controllers
Example of H-LINK System:
Outdoor
Unit
Transmission
Wires
Refrigerant Piping
Indoor Units
: One Refrigerant Cycle
Outdoor Unit
RAS-FSG
RAS-FSG1
RAS-FXG
RAS-FXG1
CS-NET
ELECTRICAL WIRING
§ Specifications:
- Transmission Wire: 2-Wire
- Polarity of Transmission Wire: Non-Polar Wire
- Maximum Outdoor Units To Be Connected: 16 Units
per H-LINK system.
- Maximum Indoor Units To Be Connected: 16 Units per
cycle and 128 Units per H-LINK system
- Maximum Wiring Length: Total 1000m (including CS-
NET)
- Recommended Cable: Twisted Shielded Pair Cable,
over 0.75mm2 (Equivalent to KPEV-S)
- Voltage: DC5V
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NOTE:
Other cables except for Twisted Shielded Pair Cable
must not be used for H-LINK system.
3. System Example of H-LINK
§ Using H-LINK System For Only Air Conditioners
There are two typical cases of using H-LINK system:
(1) Using H-LINK System For Only Air Conditioners, and
(2) Using H-LINK System For Air Conditioners With
Central Control Device, and the system examples are as
shown below
- Line Connection with All units
Outdoor Units
Indoor Units
15
/11
Do not
make wiring
in a loop