LG multi V ARUN Series Installation Manual page 54

Electrical Wiring
Outdoor Unit
Master Slave1 Slave2
Outdoor Unit
Master Slave1 Slave2
2-Core Shield Cable
CAUTION
• Use the 2-core shield cables for transmission lines. Never use them together with power cables.
• The conductive shielding layer of cable should be grounded to the metal part of both units.
• Never use multi-core cable
• As this unit is equipped with an inverter, to install a phase leading capacitor not only will
deteriorate power factor improvement effect, but also may cause capacitor abnormal heating.
Therefore, never install a phase leading capacitor.
• Make sure that the power unbalance ratio is not greater than 2%. If it is greater the units lifespan
will be reduced.
u Precautions when laying power wiring
Use round pressure terminals for connections to the power terminal block.
When none are available, follow the instructions below.
• Do not connect wiring of different thicknesses to the power terminal block. (Slack in the power wiring
may cause abnormal heat.)
• When connecting wiring which is the same thickness, do as shown in the figure below.
• For wiring, use the designated power wire and connect firmly, then secure to prevent outside
pressure being exerted on the terminal block.
• Use an appropriate screwdriver for tightening the terinal screws. A screwdriver with a small head will
strip the head and make proper tighterning impossible.
• Over-tightening the terminal screws may break them.
CAUTION
When the 400 volt power supply is applied to "N" phase by mistake, replace inverter PCB and transformer in
control box.
54 Outdoor Unit
Indoor Indoor
Unit Unit
Remote Remote
controller controller
Indoor Indoor
Unit Unit
Remote Remote
controller controller
Round pressure terminal
Outdoor Unit
Master Slave1 Slave2
Outdoor Unit
Master Slave1 Slave2
Multi-Core Cable
Power wire
Indoor Indoor
Unit Unit
Remote Remote
controller controller
Indoor Indoor
Unit Unit
Remote Remote
controller controller