Hitachi RAS-2WHVRP Instruction Manual page 25

ELECTRICAL WIRING

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
• 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 and Main switch protection"
• 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.
:
TB Terminal board
:
CB Circuit breaker
:
ELB Earth leakage breaker
:
Field wiring
:
Field-supplied
13 PMML0509 rev.0 - 02/2019

Setting before shipment
Pipe length (<5m)
Pipe length (≥30m)
!
•
•
•
"10.3.2
section.
Earth
x
Earth
DSW302: Piping Length Setting (Setting is
required)
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.
Use a dedicated power circuit for the indoor unit. Do not use a power
circuit shared with the outdoor unit or any other appliance.
Outdoor unit
x
Indoor Unit
Operating Line
(Twisted Shielded Pair Cable)
DC5V (Non-Pole Transmission,
H-LINK System)