Service Manual

4. Electrical wiring
98
SMGB0079 rev.0 - 01/2013
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 gure.
• 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
2
) for operation wiring between the outdoor unit and indoor unit, and operation
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 eld-wiring is not used, x rubber bushes with adhesive on the panel.
• All eld 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 Independent power source of outdoor unit and indoor unit
3
3
3
L1 L2 L3 NL1 L2 L3 N
L1 L2 L3 N
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
Earthleakage Breaker
Field Wiring
Field supplied
Optional Accessory
Remote Control Switch
(Twisted Shielded Pair
Cable)
Indoor Unit
Indoor Unit