Hitachi UTOPIA RAS-3HVRC2 - Page 33


DSW6: No setting is required (do not change)
Setting before shipment

DSW7: No setting is required (do not change)
Factory setting

DSW302: Piping Length Setting (Setting is
required)
Setting before shipment
Pipe length (<5m)
Pipe length (≥30m)
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.
• 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.
• Check to ensure that the eld 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eldwiringandelectricalcomponentsmustcomplywithlocal
codes.
Power source from the outdoor unit to the indoor unit
(example)
Independent power source of outdoor 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
Earth leakage breaker
Field Wiring
Field supplied
Optional Accessory
Remote Control Switch
(Twisted Shielded Pair Cable)
Indoor Unit
Indoor Unit
ELECTRIC WIRING
PMML0548 rev.0 - 04/2020 - A10648790A
13
EN