LG multi V PLUS User manual

System SERVICE MANUAL
System
Air Conditioner
SERVICE MANUAL
LG
MODELS: LRUV/LRUN Series
LRNV/LRNN Series
website http://www.lgservice.com
CAUTION
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.
P/No.: 3828A24006A Printed in Korea
After reading this manual, keep it in a place easily accessible to the user for future reference.

2
Air Conditioner Service Manual
TABLE OF CONTENTS
Safety Precautions .......................................................................................3
Model Names...............................................................................................11
External Appearance..................................................................................12
Combination of Outdoor Units ..................................................................14
Nomenclature..............................................................................................15
Outdoor Units Information.........................................................................16
Indoor Units...........................................................................................21
Ceiling Mounted Cassette Type (1Way)................................................22
Ceiling Mounted Cassette Type (4 way)................................................33
Ceiling Concealed Duct Type (High static)...........................................56
Ceiling Concealed Duct Type (Low static)............................................75
Convertible Type.....................................................................................87
Wall Mounted Type................................................................................107
Art Cool Type(Deluxe) ..........................................................................123
Art Cool Type.........................................................................................143
Art Cool Type(Wide)..............................................................................161
Outdoor Units.....................................................................................179
LRUV/LRUN Series................................................................................180
Trouble Shooting Guide .......................................................................245
Appendix................................................................................................297
Exploded View & Replacement Parts List ..........................................303

Safety Precautions
Service Manual 3
Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions must
be followed.
■Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is
classified by the following indications.
■Meanings of symbols used in this manual are as shown below.
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to properties only.
Be sure not to do.
Be sure to follow the instruction.
■Installation
Have all electric work done by a licensed
electrician according to "Electric Facility
Engineering Standard" and "Interior Wire
Regulations" and the instructions given in
this manual and always use a special circuit.
• If the power source capacity is inadequate or
electric work is performed improperly, electric
shock or fire may result.
Ask the dealer or an authorized technician to
install the air conditioner.
• Improper installation by the user may result in
water leakage, electric shock, or fire.
Always ground the product.
• There is risk of fire or electric shock.
Always intstall a dedicated circuit and breaker.
• Improper wiring or installation may cause fire or
electric shock.

4
Safety Precautions
For re-installation of the installed product,
always contact a dealer or an Authorized
Service Center.
• There is risk of fire, electric shock, explosion, or
injury.
Do not install, remove, or re-install the unit
by yourself (customer).
• There is risk of fire, electric shock, explosion, or
injury.
Do not store or use flammable gas or
combustibles near the air conditioner.
• There is risk of fire or failure of product.
Use the correctly rated breaker or fuse.
• There is risk of fire or electric shock.
Prepare for strong wind or earthquake and
install the unit at the specified place.
• Improper installation may cause the unit to top-
ple and result in injury.
Do not install the product on a defective
installation stand.
• It may cause injury, accident, or damage to the
product.
When installing and moving the air condition-
er to another site, do not charge it with a
different refrigerant from the refrigerant
specified on the unit.
• If a different refrigerant or air is mixed with the
original refrigerant, the refrigerant cycle may
malfunction and the unit may be damaged.
Do not reconstruct to change the settings of
the protection devices.
• If the pressure switch, thermal switch, or other
protection device is shorted and operated
forcibly, or parts other than
those specified by LGE are
used, fire or explosion may
result.
Gasolin

Safety Precautions
Service Manual 5
Ventilate before operating air conditioner
when gas leaked out.
• It may cause explosion, fire, and burn.
Securely install the cover of control box and
the panel.
• If the cover and panel are not installed securely,
dust or water may enter the outdoor unit and fire
or electric shock may result.
If the air conditioner is installed in a small room, measures must be taken to prevent the
refrigerant concentration from exceeding the safety limit when the refrigerant leaks.
• Consult the dealer regarding the appropriate measures to prevent the safety limit from being exceed-
ed. Should the refrigerant leak and cause the safety limit to be exceeded, harzards due to lack of oxy-
gen in the room could result.
■Operation
Do not damage or use an unspecified power
cord.
• There is risk of fire, electric shock, explosion, or
injury.
Use a dedicated outlet for this appliance.
• There is risk of fire or electrical shock.
Be cautious that water could not enter the
product.
• There is risk of fire, electric shock, or product
damage.
Do not touch the power switch with wet
hands.
• There is risk of fire, electric shock, explosion, or
injury.

6
Safety Precautions
When the product is soaked (flooded or
submerged), contact an Authorized Service
Center.
• There is risk of fire or electric shock.
Be cautious not to touch the sharp edges
when installing.
• It may cause injury.
Take care to ensure that nobody could step
on or fall onto the outdoor unit.
• This could result in personal injury and product
damage.
Do not open the inlet grill of the product dur-
ing operation. (Do not touch the electrostatic
filter, if the unit is so equipped.)
• There is risk of physical injury, electric shock, or
product failure.
■Installation
Always check for gas (refrigerant) leakage
after installation or repair of product.
• Low refrigerant levels may cause failure of
product.
Do not install the product where the noise or
hot air from the outdoor unit could damage
the neighborhoods.
• It may cause a problem for your neighbors.
Keep level even when installing the product.
• To avoid vibration or water leakage.
Do not install the unit where combustible gas
may leak.
• If the gas leaks and accumulates around the
unit, an explosion may result.
90˚
Gasolin

Service Manual 7
Safety Precautions
Use power cables of sufficient current
carrying capacity and rating.
•Cables that are too small may leak, generate
heat, and cause a fire.
Do not use the product for special purposes,
such as preserving foods, works of art, etc. It
is a consumer air conditioner, not a precision
refrigeration system.
•There is risk of damage or loss of property.
Keep the unit away from children. The heat
exchanger is very sharp.
•It can cause the injury, such as cutting the finger.
Also the damaged fin may result in degradation
of capacity.
When installting the unit in a hospital, com-
munication station, or similar place, provide
sufficient protection against noise.
• The inverter equipment, private power generator,
high-frequency medical equipment, or radio com-
munication equipment may cause the air condition-
er to operate erroneously, or fail to operate. On the
other hand, the air conditioner may affect such
equipment by creating noise that disturbs medical
treatment or image broadcasting.
Do not install the product where it is exposed to sea wind (salt spray) directly.
•It may cause corrosion on the product. Corrosion, particularly on the condenser and evaporator fins,
could cause product malfunction or inefficient operation.

8
Safety Precautions
■Operation
Do not use the air conditioner in special
environments.
•Oil, steam, sulfuric smoke, etc. can significantly
reduce the performance of the air conditioner or
damage its parts.
Do not block the inlet or outlet.
•It may cause failure of appliance or accident.
Make the connections securely so that the
outside force of the cablemay not be applied
to the terminals.
•Inadequate connection and fastening may gen-
erate heat and cause a fire.
Be sure the installation area does not deteri-
orate with age.
•If the base collapses, the air conditioner could
fall with it, causing property damage, product
failure, or personal injury.
Install and insulate the drain hose to ensure that water is drained away properly based on the
installation manual.
•A bad connection may cause water leakage.
Be very careful about product transportation.
•Only one person should not carry the product if it weighs more
than 20 kg.
•Some products use PP bands for packaging. Do not use any PP
bands for a means of transportation. It is dangerous.
•Do not touch the heat exchanger fins. Doing so may cut your fin-
gers.
•When transporting the Outdoor Unit, suspending it at the specified
positions on the unit base. Also support the Outdoor Unit at four
points so that it cannot slip sideways.

Service Manual 9
Safety Precautions
Safely dispose of the packing materials.
• Packing materials, such as nails and other metal or
wooden parts, may cause stabs or other injuries.
• Tear apart and throw away plastic packaging bags
so that children may not play with them. If children
play with a plastic bag which was
not torn apart, they face the
risk of suffocation.
Turn on the power at least 12 hours before
starting operation.(In case of outdoor
temperature 5°C below)
•Starting operation immediately after turning on
the main power switch can result in severe
damage to internal parts. Keep the power switch
turned on during the operational season.
Do not touch any of the refrigerant piping
during and after operation.
•It can cause a burn or frostbite.
Do not operate the air conditioner with the
panels or guards removed.
•Rotating, hot, or high-voltage parts can cause
injuries.
Do not directly turn off the main power
switch after stopping operation.
•Wait at least 5 minutes before turning off the
main power switch.
Otherwise it may result in
water leakage or other
problems.
Auto-addressing should be done in condition of
connecting the power of all indoor and outdoour
units. Auto-addressing should also be done in
case of changing the Indoor Unit board(PCB).
Use a firm stool or ladder when cleaning or
maintaining the air conditioner.
•Be careful and avoid personal injury.
Do not insert hands or other objects through
the air inlet or outlet while the air conditioner
is plugged in.
•There are sharp and moving parts that could
cause personal injury.

10
Part 1
General Information
1. Model Names ................................................................11
1.1 Indoor Unit.............................................................11
1.2 Outdoor Unit..........................................................11
2. External Appearance.....................................................12
2.1 Indoor Unit.............................................................12
2.2 Outdoor Unit..........................................................13
3. Combination of Outdoor Units.....................................14
4. Nomenclature.................................................................15
4.1 Indoor Unit..............................................................15
4.2 Outdoor Unit...........................................................15
5. Outdoor Units Information............................................16