Hitachi RAS-3HVRNS3 - 16.3 COMMON WIRING; 16.3.1 Indoor to Outdoor Unit Wiring; Wiring Connection CAUTIONS

22
PMML0318A - P5415337
Electrical wiring
16.3 COMMON WIRING
16.3.1 Electrical wiring between indoor unit and
outdoor unit
• Connect the electrical wires between the indoor unit and the
outdoor unit, as shown below.
• If the refrigerant piping and the control wiring are connected to
the units in the same refrigerant cycle.
• Use twist pair wire (more than 0.75 mm²) for operation wiring
between outdoor unit and indoor unit, and operation wiring
between indoor unit and indoor unit.
• Use 2-core wire for the operating line (Do not use wire with
more than 3 cores).Use shielded wires for intermediate wiring
to protect the units from noise obstacle at length of less than
300 m and size complied with local code.
• Open a hole near the connection hole of power source wiring
when multiple outdoor units are connected from one power
source line.
• The recommended breaker sizes are detailed in the Wire size
section.
• In the case that a conduit tube for eld-wiring is not used, x
rubber bushes with adhesive on the panel.
• H-LINK twist pair shielded cable must be grounded in the
outdoor unit side.
CAUTION
Pay attention to the connection of the operating line. Incorrect
connection may cause the failure of PCB.
All the eld wiring and electrical components must comply with
local codes.
16
Power source from the outdoor IVX unit to the indoor unit
(example)
Independent power source of outdoor IVX unit and indoor unit
(example)
No. 0 System
Outdoor unit
No. 0 System
Outdoor unit
Operating Line
(Shielded Pair Cable)
DC5V (Non-Pole Transmission,
H-LINK System)
Remote Control Switch
(Twisted Shielded Pair
Cable)
Operating Line
(Twisted Shielded
Pair Cable)
DC5V (Non-Pole
Transmission, H-LINK
System)
Indoor Unit
Indoor Unit
Terminal board
Circuit Breaker
Earthleakage Breaker
Field Wiring
Field supplied
Optional Accessory
Remote Control Switch
(Twisted Shielded Pair
Cable)
Indoor Unit
Indoor Unit
12
ON
DSW6
12
ON
DSW6
12
ON
DSW6
Operating line
Operating line Operating line
Remote control
line
Remote control
line
Remote control
line
Individual control
Running ON/OFF individually
Thermo.ON/OFF individually
Individual control
Running ON/OFF simultaneously
Thermo.ON/OFF individually
Simultaneous control
Running ON/OFF simultaneously
Thermo.ON/OFF simultaneously
(IVX series only)