LG ARUV025GSD0 Engineering Product Data Book page 55

8. Electrical Wiring
CAUTION
• This product have reversed phase protection detector that only works when the power is turned
on. If there exists black out or the power goes on and off which the product is operating, attach a
reversed phase protection circuit locally. running the product in reversed phase may break the
compressor and other parts.
• Use the 2-core shield cables for communication 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 deterio-
rate 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 unit's lifespan
will be reduced.
• Introducing with a missing N-phase or with a mistaken N-phase will break the equipment.
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 terminal 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.
22 _
R410A(50/60Hz)
Round pressure terminal
Power wire