Common Wiring; Electrical Wiring Between Indoor Unit And Outdoor Unit - Hitachi RAS-4HRNS3E Installation And Operation Manual

Electrical wiring

15.3 COMMON WIRING

C A U T I O N
All the field wiring and electrical components must comply with
local codes.
15.3.1 Electrical wiring between indoor unit and
outdoor unit
• Connect the electrical wires between the indoor unit and the
outdoor unit, as shown below.
• Follow local codes and regulations when performing electrical
wiring.
• 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).
Power source from the outdoor IVX unit
to the indoor unit (example)
No. 0 System
L1 L2 L3 L1 L2 L3 N N
Outdoor unit
3
Indoor Unit
Terminal board
Circuit Breaker
Earthleakage Breaker
Field Wiring
Field supplied
Optional Accessory
Wiring example (IVX series only)
Basic combinations (in the case of twin combination)
Operating line
Remote control
line
Individual control
Running ON/OFF individually
Thermo.ON/OFF individually
28
Operating Line
(Shielded Pair Cable)
5V (Non-Pole Transmission,
H-LINK System)
Indoor Unit
Remote Control Switch
(Twisted Shielded Pair
Cable)
Operating line
Remote control
line
DSW6
ON
1 2
PMML0317A rev.1 - 11/2013
• 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 field-wiring is not used, fix
rubber bushes with adhesive on the panel.
• All the field wiring and equipment must comply with local and
international codes.
• H-LINK twist pair shielded cable must be grounded in the out-
door unit side.
C A U T I O N
Pay attention to the connection of the operating line. Incorrect
connection may cause the failure of PCB.
Independent power source of outdoor IVX unit
L1 L2 L3
3
3
Operating line
Remote control
line
DSW6
ON
1 2
Individual control
Running ON/OFF simultaneously
Thermo.ON/OFF individually
and indoor unit (example)
No. 0 System
Outdoor unit
N
Indoor Unit
Remote Control Switch
(Twisted Shielded Pair
Cable)
DSW6
ON
1 2
Simultaneous control
Running ON/OFF simultaneously
Thermo.ON/OFF simultaneously
Operating Line
(Twisted Shielded
Pair Cable)
5V (Non-Pole Trans-
mission, H-LINK
System)
Indoor Unit