LG MULTI V ARNU073TAA4 User manual

OWNER'S MANUAL
AIR CONDITIONER
Read this owner's manual thoroughly before operating the
appliance and keep it handy for reference at all times.
ENGLISH
ARNU073TAA4
MFL72017419
Rev.00_050323
www.lg.com
Copyright © 2023 LG Electronics Inc. All Rights Reserved.
Scan to see the online manual.
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TABLE OF CONTENTS
2
3 SAFETY INSTRUCTIONS
3 READ ALL INSTRUCTIONS BEFORE USE
3 Safety Messages
4 Notes for Flammable Refrigerant
4 WARNING INSTRUCTIONS
4 Technical Safety
4 Installation
5 Operation
6 Wireless Remote Control
6 Maintenance
6 Refrigerant
6 CAUTION INSTRUCTIONS
6 Installation
7 Operation
7 Maintenance
9 OPERATION
9 Before Use
9 Notes for Operation
9 Suggestions for Energy Saving
10 Product Overview
10 4 Way Cassette
12 Display
12 Auto Restart Function
13 Using the Appliance with Remote Control
14 SMART FUNCTIONS
14 LG ThinQ Application
14 LG ThinQ Application Features
14 Before Using LG ThinQ Application
15 Installing LG ThinQ Application
15 Open Source Software Notice Information
15 Radio Equipment Specifications
16 MAINTENANCE
16 Cleaning
16 Cleaning Interval
17 Cleaning the Air Filter
21 Cleaning the PM1.0 Sensor
21 Tips for Maintenance
21 Before Long Periods of Disuse
22 After Long Periods of Disuse
23 TROUBLESHOOTING
23 Before Calling for Service
23 Operation
25 Performance
26 Wi-Fi
26 Calling for Service
26 Situations in which Calling for Service is
Necessary
28 LIMITED WARRANTY
28 USA
28 ARBITRATION NOTICE:
28 PROCEDURE FOR RESOLVING DISPUTES:
29 CANADA
29 ARBITRATION NOTICE:
29 PROCEDURE FOR RESOLVING DISPUTES:

3SAFETY INSTRUCTIONS
ENGLISH
SAFETY INSTRUCTIONS
READ ALL INSTRUCTIONS BEFORE USE
The following safety guidelines are intended to prevent unforeseen risks or damage from unsafe or
incorrect operation of the appliance.
The guidelines are separated into ‘WARNING’ and ‘CAUTION’ as described below.
Safety Messages
This symbol is displayed to indicate matters and operations that can cause risk.
Read the part with this symbol carefully and follow the instructions in order to avoid risk.
WARNING
This indicates that the failure to follow the instructions can cause serious injury or death.
CAUTION
This indicates that the failure to follow the instructions can cause the minor injury or damage to the
product.

4SAFETY INSTRUCTIONS
Notes for Flammable Refrigerant
The following symbols are displayed on units.
WARNING INSTRUCTIONS
WARNING
• To reduce the risk of explosion, fire, death, electric shock, injury or scalding to persons when using this
product, follow basic precautions, including the following:
Technical Safety
• This appliance is not intended for use by persons (including children) with reduced physical, sensory or
mental capabilities, or lack of experience and knowledge, unless they have been given supervision or
instruction concerning use of the appliance by a person responsible for their safety. Children should be
supervised to ensure that they do not play with the appliance.
• Installation or repairs made by unauthorized persons can pose hazards to you and others.
• The information contained in the manual is intended for use by a qualified service technician who is
familiar with the safety procedures and equipped with the proper tools and test instruments.
• Failure to read and follow all instructions in this manual can result in equipment malfunction, property
damage, personal injury and/or death.
• The refrigerant and insulation blowing gas used in the appliance require special disposal procedures.
Consult a service agent or a similarly qualified person before disposing of them.
• When the power cord is to be replaced, the replacement work shall be performed by authorized
personnel using only genuine replacement parts.
• If the supply cord is damaged, it must be replaced by the manufacturer or its service agents or similarly
qualified person in order to avoid a hazard.
• The appliance shall be installed in accordance with national wiring regulations.
• This appliance must be properly grounded.
• Do not cut or remove the grounding prong from the power plug.
• Attaching the earth wire to the power outlet cover screw does not ground the appliance unless the cover
screw is metal, uninsulated, and the power outlet is grounded through house wiring.
• If you have any doubt whether the air conditioner is properly grounded, have the power outlet and
circuit checked by a qualified electrician.
• Installation MUST conform to the local building codes or, in the absence of local codes, the National
Electrical Code NFPA 70/ANSI C1-1003 or current edition and Canadian Electrical Code Part1 CSA C.22. 1.
Installation
• Contact the dealer, seller, qualified electrician or authorized service center when installing or relocating
the air conditioner.
This symbol indicates that this appliance uses a flammable refrigerant. If the refrigerant is leaked and
exposed to an external ignition source, there is a risk of fire.
This symbol indicates that the Owner's Manual should be read carefully.
This symbol indicates that service personnel should be handling this equipment with reference to the
Installation Manual.
This symbol indicates that information is available in the Owner's Manual or Installation Manual.

5SAFETY INSTRUCTIONS
ENGLISH
• Contact the dealer, seller, qualified electrician or authorized service center for cleaning or maintenance
the air conditioner.
• Do not install, remove, or re-install the unit by yourself (customer). Installation or reparis done by
unauthorized persons can pose hazards to you and others.
• For electrical work, contact the dealer, seller, qualified electrician or authorized service center.
• Do not attempt to do electrical work or grounding work unless you are licensed to do so. Consult with
the dealer for electrical work and grounding work.
• Do not install the product on a defective installation stand.
• Be sure the installation area does not deteriorate with age.
• Be sure to only use accessories made by LG which are specifically designed for use with the equipment
and have them installed by a professional.
• Never install the outdoor unit on a moving base or a place from where it can fall down.
• Do not install the unit in potentially explosive atmospheres.
• Do not install the air conditioner in a place where flammable liquids or gases such as gasoline, propane,
paint thinner, etc., are stored.
• Install the panel and the cover of the control box safely.
• Install dedicated electric outlet and earth leakage breaker before using the appliance.
• Use standard circuit breaker and fuse that conform to the rating of the air conditioner.
• Do not use a multiple socket, extension power cable or adapter with this appliance.
• The indoor/outdoor wiring connections must be secured tightly, and the cable should be routed properly
so that there is no force pulling the cable from the connection terminals. Improper or loose connections
can generate heat or cause a fire.
• Do not connect the ground wire to a gas pipe, a lightning rod, or a telephone ground wire.
• Use non-flammable gas (nitrogen) to check for leaks and to purge air; using compressed air or
flammable gas may cause fire or explosion.
Operation
• Do not modify or extend the power cable. Scratches or peeling insulation on the power cables may result
in fire or electric shock, and should be replaced.
• Make sure that the power cable is neither dirty, loose, nor broken.
• Do not place any objects on the power cable.
• Take care to ensure that the power cable could not be pulled out or damaged during operation.
• Never touch, operate, or repair the air conditioner with wet hands.
• Do not insert hands or other objects through the air inlet or outlet while the air conditioner is operating.
• Make sure that nobody especially children do not climb on or hit the outdoor unit.
• Be sure to use only those parts listed in the service parts list. Never attempt to modify the equipment.
• Do not touch the refrigerant pipe, water pipe or any internal parts while the unit is operating or
immediately after operation.
• Do not leave flammable substances such as gasoline, benzene, or thinner near the air conditioner.
• Do not use the air conditioner for an extended period of time in a small place without proper ventilation.
• Be sure to ventilate sufficiently when the air conditioner and a heating appliance such as a heater are
used simultaneously.
- There is the possibility of oxygen deficiency.
• Do not block the inlet or outlet of airflow.
• Cut off the power supply if there is any noise, smell, or smoke coming from the air conditioner.
• Contact an authorized service center when the air conditioner is submerged by flood waters.

6SAFETY INSTRUCTIONS
• In the event of a gas leak (such as Freon, propane gas, LP gas, etc.) ventilate sufficiently before using the
air conditioner again.
• Stop operation and close the window in storm or hurricane. If possible, remove the product from the
window before the hurricane arrives.
Wireless Remote Control
• Never mix different types of batteries, or old and new batteries for the remote control.
• Do not recharge or disassemble the batteries.
• Dispose of the batteries in a place where there is no danger of fire.
• Stop using the remote control if there is a fluid leak in the battery. If your clothes or skin is exposed to
the leaking battery fluid, wash off with clean water.
• If the leaking battery fluid has been swallowed, rinse the inside of the mouth thoroughly and consult a
doctor.
• Never let the indoor unit or the remote control get wet.
Maintenance
• Before cleaning or performing maintenance, disconnect the power supply and wait until the fan stops.
- The fan rotates at a very high speed during operation.
- There is a possibility of injury if the unit’s power is accidentally triggered on while cleaning inner parts
of the unit.
• Appliance shall be disconnected from its power source during service and replacing parts.
Refrigerant
• Follow the standards of the corresponding region or country for handling the refrigerant and the air
conditioner and for disassembling the air conditioner.
• Use only the refrigerant specified on the air conditioner label.
• Do not input air or gas into the system except the specified refrigerant.
• Do not touch the leaking refrigerant during installation or repair.
• If the refrigerant gas leaks during the installation, ventilate the area immediately.
• Be sure to check for refrigerant leaks after installing or repairing the product.
• In the case of refrigerant leakage, consult the dealer. When the air conditioner is to be installed in a
small room, it is necessary to take proper measures so that the amount of any leaked refrigerant does
not exceed the limiting concentration even when it leaks. If the refrigerant leaks exceeding the level of
limiting concentration, an oxygen deficiency accident may happen.
CAUTION INSTRUCTIONS
CAUTION
• To reduce the risk of minor injury to persons, malfunction, or damage to the product or property when
using this product, follow basic precautions, including the following:
Installation
• Transport the air conditioner with two or more people or use a forklift.
• Do not install the air conditioner in an area where it is directly exposed to sea wind (salt spray).

7SAFETY INSTRUCTIONS
ENGLISH
• Install the drain hose properly for the smooth drainage of water condensation.
• Install the air conditioner in a place where the noise from the outdoor unit or the exhaust fumes will not
inconvenience the neighbors.
• Safely dispose of packing materials such as screws, nails, plastic bags or batteries using proper
packaging after installation or repair.
• Exercise caution when unpacking or installing the air conditioner.
• Be especially careful of the case edges and the fins on the condenser and evaporator.
• To avoid vibration or water leakage, keep level even when installing the product. To avoid vibration or
water leakage.
• When installing the unit, use the installation kit provided with the product.
• The heat exchanger fins are sharp edges enough to cut. To avoid injury, wear gloves or cover the fins
while working around them.
Operation
• Do not drink the water drained from the air conditioner.
• Do not place objects in direct proximity of the outdoor unit and do not let leaves and other debris
accumulate around the unit. Leaves are a hotbed for small animals which can enter the unit. Once inside
the unit, such animals can cause malfunctions, smoke or fire if they come into contact with electrical
parts.
• Do not let the air conditioner run for a long time when humidity is very high or when a door or a window
has been left open.
• Do not expose people, animals, or plants to the cold or hot wind from the air conditioner for extended
periods of time.
• Do not use the product for special purposes, such as preserving foods, works of art, etc. the air
conditioner is designed for consumer purposes, and is not a precision refrigeration system. There is risk
of damage or loss of property.
• Do not turn on the breaker or power under condition that front panel, cabinet, top cover, control box
cover are removed or opened.
• Do not open the front grille of the product during operation. Do not touch the electrostatic filter, if the
unit is so equipped.
• Be cautious that water could not enter the product.
• Make sure that there are no obstacles close to the outdoor unit. The presence of obstacles close to the
outdoor unit may reduce the performance of outdoor unit or increase its operating sound.
• Do not turn off the power immediately after stopping operation. Always wait for at least five minutes
before turning off the power.
Maintenance
• Use a sturdy stool or ladder when cleaning, maintaining, or repairing the air conditioner at a height.
• Do not plug or unplug the power supply plug to turn the unit on or off.
• Never use strong cleaning agents or solvents or spray water when cleaning the air conditioner. Use a
soft cloth.
• Never touch the metal parts of the air conditioner when removing the air filter.
• Tear apart and throw away plastic packaging bags so that children will not play with them.
• When the product is not to be used for a long time, disconnect the power supply plug or turn off the
breaker.
• Do not tilt the unit when removing or uninstalling it. The condensed water inside can spill.
• Check the foundation for damaged on a continuous basis, especially if it has been in use for a long time.

8SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
• Always insert the filter securely. Clean the filter every two weeks or more often if necessary. A dirty filter
reduces the efficiency of the air conditioner and could cause product malfunction or damage.

9OPERATION
ENGLISH
OPERATION
Before Use
Notes for Operation
• Adjust the direction of the airflow vertically to circulate indoor air.
• Speed up the fan to cool or warm indoor air quickly, within a short period of time.
• Turn off the appliance and periodically open windows for ventilation. The indoor air quality may
deteriorate if the appliance is used for long periods.
• Clean the air filter once every 2 weeks. Dust and impurities collected in the air filter may block the airflow
or reduce the appliance performance.
Suggestions for Energy Saving
• Do not over-cool the space. This may be harmful to your health and may consume more electricity.
• Block sunlight with blinds or curtains while you are operating the appliance.
• Keep doors or windows closed tightly while you are operating the appliance.

10 OPERATION
Product Overview
4 Way Cassette
Dual Vane Type
aOperating Status Lamp and Remote Control Receiver
Displays the operating status and contains the receiver for the wireless remote.
bForced Operation Button
Operates the product when the remote control can't be used.
cAir Intake/Air Filter
• Air Intake: Takes in air from the room.
• Air Filter: Reduces dust in the air.
dAir Outlet
Circulates air back into the room at the desired temperature.
• Various types of airflow are generated by dual vane.
ePM 1.0 Sensor†
Detects indoor fine dust concentration.
† This sensor is provided only when the air purifying front panel is installed.

11OPERATION
ENGLISH
Normal Type
aOperating Status Lamp and Remote Control Receiver
Displays the operating status and contains the receiver for the wireless remote.
bForced Operation Button
Operates the product when the remote control can't be used.
cAir Intake/Air Filter
• Air Intake: Takes in air from the room.
• Air Filter: Reduces dust in the air.
dAir Outlet
Circulates air back into the room at the desired temperature.

12 OPERATION
Display
aOperating Status Lamp
† The Clean Filter indicator lamp does not light
up starting from the corresponding product
manufacturing number (After Oct. 2021).
bForced Operation Button
Operates the appliance when the remote
control can't be used.
•Pressthebbutton for about 2 seconds.
Auto Restart Function
When the appliance is turned on again after a
power failure, it restores the previous operation
settings and run in the same.
• This function is useful in the case of power
failure.
• This function is enabled by the factory default
settings.
• If you want to set or disable the auto restart
function, press and hold the Forced Operation
Button bfor 15 seconds.
Color Description
Green
1) Cooling or Heating mode
2) Hot start or defrost mode
before starting heating
mode
Yellowish
Green
1) Time to clean the filter in
cooling or heating mode†
2) when reservations sets are
set.
Orange Time to clean filter when the
product is not operating.

13OPERATION
ENGLISH
Using the Appliance with Remote
Control
Follow these steps to see a detailed guide for using
the product with the remote control.
1 Click the below website address.
• www.lg.com
2 Insert the model name in the search box.
• The model name is on the remote control or
printed on the box in which the remote
control is packed.
3 Search the manual that you want to see.
NOTE
• Some models do not have a manual on the
website. For those models, refer to the manual
included with the remote control.

14 SMART FUNCTIONS
SMART FUNCTIONS
LG ThinQ Application
The LG ThinQ application allows you to
communicate with the appliance using a
smartphone.
LG ThinQ Application Features
Communicate with the appliance from a
smartphone using the convenient smart features.
•Smart Diagnosis
- If you experience a problem while using the
appliance, this smart diagnosis feature will
help you diagnose the problem.
• Settings
- Allows you to set various options on the
appliance and in the application.
NOTE
• If you change your wireless router, internet
service provider, or password, delete the
registered appliance from the LG ThinQ
application and register it again.
• The application is subject to change for
appliance improvement purposes without notice
to users.
• Functions may vary by model.
Before Using LG ThinQ Application
1 Check the distance between the appliance
and the wireless router (Wi-Fi network).
• If the distance between the appliance and
the wireless router is too far, the signal
becomes weak. It may take a long time to
register or fail to install the application.
2 Turn off the Mobile data or Cellular Data on
your smartphone.
3 Connect your smartphone to the wireless
router.
NOTE
• To verify the Wi-Fi connection, check that ficon
on the control panel is lit.
• The appliance supports 2.4 GHz Wi-Fi networks
only. To check your network frequency, contact
your Internet service provider or refer to your
wireless router manual.
•LG ThinQ is not responsible for any network
connection problems or any faults, malfunctions,
or errors caused by network connection.
• If the appliance is having trouble connecting to
the Wi-Fi network, it may be too far from the
router. Purchase a Wi-Fi repeater (range
extender) to improve the Wi-Fi signal strength.
• The Wi-Fi connection may not connect or may be
interrupted because of the home network
environment.
• The network connection may not work properly
depending on the Internet service provider.
• The surrounding wireless environment can
make the wireless network service run slowly.
• If the appliance cannot be connected due to
problems with the wireless signal transmission,
unplug the appliance and wait about a minute
before trying again.
• If the firewall on your wireless router is enabled,
disable the firewall or add an exception to it.
• The wireless network name (SSID) should be a
combination of English letters and numbers. (Do
not use special characters.)
• Smartphone user interface (UI) may vary
depending on the mobile operating system (OS)
and the manufacturer.
• If the security protocol of the router is set to
WEP, you may fail to set up the network. Please
change it to other security protocols (WPA2 is
recommended) and register the product again.

15SMART FUNCTIONS
ENGLISH
Installing LG ThinQ Application
Search for the LG ThinQ application from the
Google Play Store or Apple App Store on a
smartphone. Follow instructions to download and
install the application.
Open Source Software Notice
Information
To obtain the source code that is contained in this
product, under GPL, LGPL, MPL, and other open
source licenses that have the obligation to disclose
source code, and to access all referred license
terms, copyright notices and other relevant
documents, please visit https://
opensource.lge.com.
LG Electronics will also provide open source code
to you on CD-ROM for a charge covering the cost
of performing such distribution (such as the cost of
media, shipping, and handling) upon email
request to open[email protected].
This offer is valid to anyone in receipt of this
information for a period of three years after our
last shipment of this product.
Radio Equipment Specifications
Model LCW-007
Frequency
Range
2412 MHz - 2472 MHz
Output
Power(Max)
17.59 dBm

16 MAINTENANCE
MAINTENANCE
Cleaning
Cleaning Interval
† This filter is provided only when the air purifying
front panel is installed.
NOTE
• Never use water that is hotter than 40 ℃when
you clean the filters. Doing so may cause
deformation or discolouration.
• Never use volatile substances when you clean
the filters. Doing so may damage the surface of
the appliance.
• Cleaning interval is set period assuming that 8
hours of daily use.
• If the filter is clogged with dust, the cooling/
heating efficiency will drop.
- 6 % of the electricity will be wasted.
Filter Type Water
Washing
Interval
aAir Filter O2Weeks
bPM1.0 Filter†O 6 Months
cDeodorization
Filter†X 6 Months

17MAINTENANCE
ENGLISH
Cleaning the Air Filter
WARNING
• Wear gloves during the work.
• Before cleaning or performing maintenance,
disconnect the power supply and wait until the
fan stops.
CAUTION
• When you remove the air filter, do not touch the
metal parts of the indoor unit. Doing so may
cause an injury.
• Do not bend the air filter, as it may break.
• Assemble the air filter properly to prevent dust
and other substances from entering the product.
Removing the Filter
1 Press the Knobs aon both sides and open
the front grille.
2 Press the Clips bon both sides and seperate
the bottom of the air filter from the front
grille.
3 Remove the air filter.
4 Press the Fixing Handle cand pull down the
upper side of PM1.0 Filter d.

18 MAINTENANCE
WARNING
• Don't touch the PM1.0 Filter within 10 seconds
after opening the front grille.
- Unless, it may cause an electric shock.
5 Lift the PM1.0 Filter slightly and remove it
from the appliance.
6 Remove the Deodorization Filter eby
pressing it up.
Cleaning the Air Filter
1 Clean the air filter with a vacuum cleaner or
wash it with lukewarm water and a mild
detergent.
2 Dry the filter in the shade.
Cleaning the PM1.0 Filter and
Deodorization Filter
PM1.0 Filter
1) Soak the PM1.0 filter in enough water to
submerge it and shake it several times to clean
it.
• Clean the filter without disassembling it.
• If it is heavily soiled, soak it in lukewarm
water with neutral detergent for 30 minutes,
then rinse thoroughly with clean water.

19MAINTENANCE
ENGLISH
2) Dry in the shade for about a day.
• If you assemble the PM1.0 filter with
moisture remaining, 7 beeps will sound.
CAUTION
• Do not use hot water over 40 \or volatile
liquids.
• Do not use acidic detergents such as citric acid.
• Drying with a hot air heater, such as a hair dryer
or a heater, could damage or deform the filter.
• The inside of the filter is sharp, so do not rub or
touch it directly.
Deodorization Filter
Do not wash the deodorization filter with water
and dry for about 3 hours under weak sunlight or
fluorescent light.
• Washing the filter with water could damage or
deform it.
Mounting the Filter
1 Insert the Deodorization Filter einto the
PM1.0 Filter by pressing it down.
2 Mount PM1.0 Filter don the hooks.
3 Push up the upper side of PM1.0 Filter and fix
to the appliance.
4 Insert the hooks on the upper side of the air
filter into the holes.

20 MAINTENANCE
5 Insert the clips into the hooking holes on the
bottom of front grile.
6 Close up the front grille to the appliance.
7 Fix the upper side of the front grille by
pressing the knobs.
8 Press the centre of the left and right sides
once.