Wiring Of Main Power Supply And Equipment Capacity; Field Wiring - LG MULTI V Series Installation Manual

Wiring of main power supply and equipment
capacity
- Use a separate power supply for the Outdoor Unit and Indoor Unit.
- Bear in mind ambient conditions (ambient temperature,direct
sunlight, rain water,etc.) when proceeding with the wiring and
connections.
- The cable size is the minimum value for metal conduit wiring. The
power cord size should be 1 rank thicker taking into account the line
voltage drops. Make sure the power-supply voltage does not drop
more than 10 %.
- Specific wiring requirements should adhere to the wiring regulations
of the region.
- Power supply cords of parts of appliances for outdoor use should not
be lighter than polychloroprene sheathed flexible cord.
- Don't install an individual switch or electrical outlet to disconnect
each of indoor unit separately from the power supply.
WARNING
!
• Follow ordinance of your governmental organization for
technical standard related to electrical equipment, wiring
regulations and guidance of each electric power company.
• Make sure to use specified cables for connections so that no
external force is imparted to terminal connections. If
connections are not fixed firmly, it may cause heating or fire.
• Make sure to use the appropriate type of overcurrent protection
switch. Note that generated overcurrent may include some
amount of direct current.
CAUTION
!
• Some installation site may require attachment of an earth leakage
breaker. If no earth leakage breaker is installed, it may cause an
electric shock.
• Do not use anything other than breaker and fuse with correct
capacity. Using fuse and wire or copper wire with too large capacity
may cause a malfunction of unit or fire.

Field Wiring

Single outdoor unit
Outdoor
Power supply
(3-phase 4-wire)
[Outdoor Unit]
(Main Switch)
R S T N
Switch
Fuse
Indoor
Power supply
(1-phase 2-wire)
L N
Power cable
(4-wire Cable)
Power cable
(2-wire Cable)
Pull Box Pull Box Pull Box
(Installer option) (Installer option) (Installer option)
Power cable Power cable
(2-wire Cable) (2-wire Cable)
Communication cable
(3-wire Cable)
[Indoor Units]
Voltage range(V)
Frequency
Outdoor Indoor
60 Hz 380 V 220 V
50 Hz 380~415 V 220~240 V
Communication cable
(2-wire Cable)
Pull Box
(Installer option)
Power cable Power cable
(2-wire Cable) (2-wire Cable)
[Heat Pump]
Between Indoor and Master Outdoor unit
SODU. B SODU. A IDU. B IDU. A CEN. B CEN. A DRY1 DRY2
3 4 3 4
WARNING
!
• Indoor Unit ground wires are required for preventing electrical shock
accident during current leakage, Communication disorder by noise
effect and motor current leakage (without connection to pipe).
• Don't install an individual switch or electrical outlet to disconnect
each of indoor unit separately from the power supply.
• Install the main switch that can interrupt all the power sources in an
integrated manner because this system consists of the equipment
utilizing the multiple power sources.
• If there exists the possibility of reversed phase, lose phase,
momentary blackout or the power goes on and off while the
product is operating, attach a reversed phase protection circuit
locally. Running the product in reversed phase may break the
compressor and other parts.
Example) Connection of transmission wire
[BUS type]
- Connection of communication
cable must be installed like
below figure between indoor
unit to outdoor unit.
Example) Connection of power and communication cable
Front side
ODU-IDU
Commun-
ication cable
Communication
cable
Master
GND 12V
Outdoor Unit
The GND terminal at the
main PCB is a '-' terminal
3 4
for day contact, it is not
the point to make ground
connection.
[STAR type]
- Abnormal operation can be
caused by communication
defect, when connection of
communication cable is installed
like below figure(STAR type).
Right side
Main power
Terminal block
Ground
Insulation
cable
sleeves
attachment
Power/
Ground
cable
Over 50 mm gap
Power/
Ground cable
25