Hitachi UTOPIA RAS-3HVRC2 Bedienungsanleitung Seite 33

ELECTRIC WIRING

DSW6: No setting is required (do not change)
Setting before shipment

DSW7: No setting is required (do not change)
Factory setting
10.3 COMMON WIRING
10.3.1 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.
Power source from the outdoor unit to the indoor unit
Nº 0 System
Outdoor unit
Indoor Unit
Terminal board
Circuit Breaker
Earth leakage breaker
Field Wiring
Field supplied
Optional Accessory
13 PMML0548 rev.0 - 04/2020 - A10648790A
(example)
Operating Line
(Shielded Pair Cable)
DC5V (Non-Pole Transmission,
H-LINK System)
Indoor Unit
Remote Control Switch
(Twisted Shielded Pair Cable)

DSW302: Piping Length Setting (Setting is
required)
Setting before shipment
Pipe length (<5m)
Pipe length (≥30m)
• 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.
• 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.
• Check to ensure that the field supplied electrical components
(mains power switches, circuit breakers, wires, connectors and wire
terminals) have been properly selected according to the electrical
data indicated on this chapter and they comply with national and local
codes. If it is necessary, contact with your local authority in regards to
standards, rules, regulations, etc.
• All the field wiring and electrical components must comply with local
codes.
Independent power source of outdoor unit and indoor unit
(example)
Nº 0 System
Outdoor unit
Operating Line
(Twisted Shielded Pair
Cable)
DC5V (Non-Pole
Transmission, H-LINK
System)
Indoor Unit
Indoor Unit
Remote Control Switch
(Twisted Shielded Pair Cable)