Common Wiring; Electrical Wiring Between Outdoor And Indoor Unit - Hitachi RAS-2-HVNP Service Manual

4. Electrical wiring

4.4 Common wiring

4.4.1 Electrical wiring between outdoor and indoor unit
• Connect the electrical wires between the indoor unit and the outdoor unit as show in the figure.
• When installing the electrical wiring, follow local codes and regulations.
• 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 mm
wiring between indoor unit and indoor unit.
• Use a 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 interference at lengths of less than 300 m.
The size must comply with local code.
• Open a hole near the connection hole of power source wiring when multiple outdoor units are connected from a single
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 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
Take care with the connection of the operating line. Incorrect connection may cause a failure of the PCB.
Power source from the outdoor unit to the indoor unit
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
98
) for operation wiring between the outdoor unit and indoor unit, and operation
2
Operating Line
(Shielded Pair Cable)
DC5V (Non-Pole Transmission,
H-LINK System)
Indoor Unit
Remote Control Switch
(Twisted Shielded Pair
Cable)
SMGB0079 rev.0 - 01/2013
Independent power source of outdoor unit and indoor unit
No. 0 System
Outdoor unit
L1 L2 L3 N
3
3
Operating Line
(Twisted Shielded Pair
Cable)
DC5V (Non-Pole
Transmission, H-LINK
System)
Indoor Unit Indoor Unit
Remote Control Switch
(Twisted Shielded Pair
Cable)