Hitachi RAS-4FSN3E Manuel D'utilisation page 24

ELECTRICAL WIRING
10.4 COMMON WIRING
10.4.1 Electrical wiring between indoor unit and outdoor unit
Connect the electrical wires between the indoor unit and the outdoor unit, as shown below.
• The refrigerant piping and the control wiring are connected to
the units in the same refrigerant cycle.
• Use twist pair wire (> 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.
Power source from the outdoor unit to the indoor unit
Nº 0 System
Outdoor unit
Terminal board
Circuit Breaker
Earthleakage Breaker
Field Wiring
Field supplied
Optional Accessory
14 PMML0389B rev.1 - 07/2016
Operating Line
(Twisted shielded pair cable or
shielded pair cable)
DC5V (Non-Pole Transmission,
H-LINK System)
Indoor unit Indoor unit
Remote
control switch
• The recommended circuit-breaker sizes are shown in the
table of electrical data and recommended wiring and breaker
sizes / 1 O.U..
• 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
outdoor 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 unit and indoor unit
Nº 0 System
Outdoor unit
Operating Line
(Twisted shielded pair
cable or shielded pair
cable)
DC5V (Non-Pole
Transmission, H-LINK
System)
Indoor unit Indoor unit
Remote control
switch