LG ARNU123NJA4 Owner's Manual

www.lghvac.com

www.lg.com

Please read this manual carefully before operating
your set and retain it for future reference.

Vertical Air Handling Unit

OWNER’S MANUAL

AIR
CONDITIONER

MFL65003202

Rev.01_061120

Copyright © 2010 - 2020 LG Electronics Inc. All Rights Reserved.

ENGLISH FRANÇAIS ESPAÑOL

Vertical Air Handling Unit Owner’s Manual

TABLE OF CONTENTS

FOR YOUR RECORDS

Safety Precautions.................3

Prior to Operation ..................6

Maintenance and Service ......7

Before you Call for

Service..................................9

WARRANTY (USA) ...............10

Write the model and serial numbers here:

Model #

Serial #

You can find them on a label on the side of each unit.

Dealer's Name

Date Purchased

n Staple your receipt to this page in the event you need

to prove date of purchase or to issue warranty.

WARRANTY (CANADA) .......12

READ THIS MANUAL

Inside you will find many helpful hints on how to use
and maintain your air conditioner properly. Just a little
preventive care on your part can save you a great deal
of time and money over the life of your air conditioner.

You'll find many answers to common problems in the
chart of troubleshooting tips. If you review our chart of

Troubleshooting Tips first, you may not need to call
for service at all.

PRECAUTION

• Contact the authorized service technician for repair or

maintenance of this unit.

• Contact the installer for installation of this unit.

• The air conditioner is not intended for use by young
children or invalids without supervision.

• Young children should be supervised to ensure that
they do not play with the air conditioner.

• When the power cord is to be replaced, replacement
work shall be performed by authorized personnel only
using only genuine replacement parts.

• Installation work must be performed in accordance with
the National Electric Code by qualified and authorized
personnel only.

2 Vertical Air Handling Unit

Safety Precautions

WARNING

CAUTION

WARNING

Safety Precautions

To prevent injury to the user or other people and property damage, the following instructions must be
followed.

n Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified

by the following indications.

This symbol indicates the possibility of death or serious injury.

This symbol indicates the possibility of injury or damage to properties only.

n Meanings of symbols used in this manual are as shown below.

Be sure not to do.

Be sure to follow the instruction.

Installation

• Do not use a defective or underrated circuit breaker. Use this appliance on a dedicated circuit.

- There is risk of fire or electric shock.

• For electrical work, contact the dealer, seller, a qualified electrician, or an Authorized Service Center.

- Do not disassemble or repair the product. There is risk of fire or electric shock.

• Always ground the product.

- There is risk of fire or electric shock.

• Install the panel and the cover of control box securely.

- There is risk of fire or electric shock.

• Always install a dedicated circuit and breaker.

- Improper wiring or installation may cause fire or electric shock.

• Use the correctly rated breaker or fuse.

- There is risk of fire or electric shock.

• Do not modify or extend the power cable.

- There is risk of fire or electric shock.

• Do not install, remove, or re-install the unit by yourself (customer).

- There is risk of fire, electric shock, explosion, or injury.

• Be cautious when unpacking and installing the product.

- Sharp edges could cause injury. Be especially careful of the case edges and the fins on the condenser and
evaporator.

• For installation, always contact the dealer or an Authorized Service Center.

- There is risk of fire, electric shock, explosion, or injury.

• Do not install the product on a defective installation stand.

- It may cause injury, accident, or damage to the product.

• Be sure the installation area does not deteriorate with age.

- If the base collapses, the air conditioner could fall with it, causing property damage, product failure, and
personal injury.

• Do not turn on the breaker or power under condition that front panel, cabinet, top cover, control box cover
are removed or opened.

ENGLISH

Owner’s Manual 3

Safety Precautions

- Otherwise, it may cause fire, electric shock, explosion or death.

• Use a vacuum pump or Inert (nitrogen) gas when doing leakage test or air purge. Do not compress air or
Oxygen and Do not use Flammable gases. Otherwise, it may cause fire or explosion.

- There is the risk of death, injury, fire or explosion.

Operation

• Do not let the air conditioner run for a long time when the humidity is very high and a door or a window is left
open.

- Moisture may condense and wet or damage furniture.

• Take care to ensure that power cable could not be pulled out or damaged during operation.

- There is risk of fire or electric shock.

• Do not place anything on the power cable.

- There is risk of fire or electric shock.

• Do not plug or unplug the power supply plug during operation.

- There is risk of fire or electric shock.

• Do not touch(operate) the product with wet hands.

- There is risk of fire or electrical shock.

• Do not place a heater or other appliances near the power cable.

- There is risk of fire and electric shock.

• Do not allow water to run into electric parts.

- It may cause fire, product failure or electric shock.

• Do not store or use flammable gas or combustibles near the product.

- There is risk of fire or failure of product.

• Do not use the product in a tightly closed space for a long time.

- Oxygen deficiency could occur.

• When flammable gas leaks, turn off the gas and open a window for ventilation before turn the product on.

- Do not use the telephone or turn switches on or off.

There is risk of explosion or fire.

• If strange sounds, smell or smoke comes from product. Turn the breaker off or disconnect the power supply
cable.

- There is risk of electric shock or fire.

• Stop operation and close the window in storm or hurricane.
If possible, remove the product from the window before the hurricane arrives.

- There is risk of property damage, failure of product, or electric shock.

• Do not open the inlet grill of the product during operation.
(Do not touch the electrostatic filter, if the unit is so equipped.)

- There is risk of physical injury, electric shock, or product failure.

• When the product is soaked (flooded or submerged), contact an Authorized Service Center.

- There is risk of fire or electric shock.

• Be cautious that water could not enter the product.

- There is risk of fire, electric shock, or product damage.

• Ventilate the product from time to time when operating it together with a stove, etc.

- There is risk of fire or electric shock.

• Turn the main power off when cleaning or maintaining the product.

- There is risk of electric shock.

• When the product is not be used for a long time, disconnect the power supply plug or turn off the breaker.

- There is risk of product damage or failure, or unintended operation.

• Take care to ensure that nobody could step on or fall onto the outdoor unit.

- This could result in personal injury and product damage.

4 Vertical Air Handling Unit

Safety Precautions

CAUTION

Installation

• Always check for gas (refrigerant) leakage after installation or repair of product.

- Low refrigerant levels may cause failure of product.

• Install the drain hose to ensure that water is drained away properly.

- A bad connection may cause water leakage.

• Keep level even when installing the product.

- To avoid vibration or water leakage.

• 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.

• Use two or more people to lift and transport the product.

- Avoid personal injury.

• Do not install the product where it will be 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.

• The Limited Warranty is void and of no effect, and LG will have no liability hereunder to any Customer or
third party, to the extent any of the following occur: acts, omissions, and conduct of any and all third parties
including, but not limited to, the installing contractor and any repairs, service or maintenance by unauthorized
or unqualified persons.

• Do not install the unit in potentially explosive atmospheres.

Operation

• Do not expose the skin directly to cool air for long periods of time. (Don't sit in the draft.)

- This could harm to your health.

• 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.

• Do not block the inlet or outlet of air flow.

- It may cause product failure.

• Use a soft cloth to clean. Do not use harsh detergents, solvents, etc.

- There is risk of fire, electric shock, or damage to the plastic parts of the product.

• Do not touch the metal parts of the product when removing the air filter. They are very sharp!

- There is risk of personal injury.

• Do not step on or put anything on the product. (outdoor units)

- There is risk of personal injury and failure of product.

• 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.

• Do not insert hands or other objects through the air inlet or outlet while the product is operated.

- There are sharp and moving parts that could cause personal injury.

• Do not drink the water drained from the product.

- It is not sanitary and could cause serious health issues.

• Use a firm stool or ladder when cleaning or maintaining the product.

- Be careful and avoid personal injury.

• Replace the all batteries in the remote control with new ones of the same type. Do not mix old and new
batteries or different types of batteries.

- There is risk of fire or explosion.

• Do not recharge or disassemble the batteries.
Do not dispose of batteries in a fire.

- They may burn or explode.

• If the liquid from the batteries gets onto your skin or clothes, wash it well with clean water. Do not use the
remote if the batteries have leaked.

- The chemicals in batteries could cause burns or other health hazards.

• If you eat the liquid from the batteries, brush your teeth and see doctor. Do not use the remote if the batteries
have leaked.

- The chemicals in batteries could cause burns or other health hazards.

Owner’s Manual 5

ENGLISH