LG Multi V ARWN Series Installation Manual page 23

! CAUTION
• Use the 2-core shield cables for communication cables. 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 in-
stall 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.
Precautions when laying power wiring
Use round pressure terminals for connections to the power terminal
block.
Round pressure terminal
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 cable which is the same thickness, do as shown in
the figure below.
- For wiring, use the designated power cable 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,
check damaged parts in control box and replace them.
Control Box and Wiring Location
- Remove all of the screws at front panel and remove the panel by
pulling it forward.
- Connect communication cable between main and sub outside unit
through the terminal block.
- Connect communication cables between outside unit and indoor
units through the terminal block.
- When the central control system is connected to the outside unit, a
dedicated PCB must be connected between them.
- When connecting communication cable between outside unit and in-
door units with shielded cable, connect the shield ground to the earth
screw.
Front
Panel
Power cable
Transmission and Power Lines
Transmission cable
- Types : shielding wire CVVS or CPEVS
2
- Cross section : 1.0 ~ 1.5 mm
- Insulation material : PVC
- Maximum allowable temperature: 60°C
- Maximum allowable line length: under 300m
Remote control cable
- Types : 3-core cable
Simple central control cable
Product type
ACP&AC Manager 2-core cable (Shielding cable)
AC Smart 2-core cable (Shielding cable)
Simple central controller 4-core cable (Shielding cable)
Separation of transmission and power lines
- If transmission and power lines are run alongside each other then
here is a strong likelihood of operational faults developing due to in-
terference in the signal wiring caused by electrostatic and electro-
magnetic coupling.
The tables below indicates our recommendation as to appropriate
spacing of communication and power cables where these are to be
run side by side
Current capacity of power cable
100V or more
Exceed 100A
!
NOTE
• The figures are based on assumed length of parallel cabling up
to 100m. For length in excess of 100m the figures will have to
be recalculated in direct proportion to the additional length of
cable involved.
• If the power supply waveform continues to exhibit some distor-
tion the recommended spacing in the table should be increased.
- If the cable are laid inside conduits then the following point
must also be taken into account when grouping various cable
together for introduction into the conduits
- Power cable(including power supply to air conditioner) and
communication cables must not be laid inside the same
- In the same way, when grouping the power wires and com-
munication cables should not be bunched together.
CAUTION
!
• If apparatus is not properly earthed then there is always a risk of
electric shocks, the earthing of the
apparatus must be carried out by a qualified person.
• Use a power wire pipe for the power wiring.
Noise Filter
Main PCB
External PCB
Take care of the
phase sequence of
3-phase 4-wire
power system
Cable type Diameter
1.0~1.5mm
1.0~1.5mm
1.0~1.5mm
Spacing
10A 300mm
50A 500mm
100A 1000mm
1500mm
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2
2
2