LG ARNU073M2A4 INSTALLATION MANUAL

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INSTALLATION MANUAL

AIR

CONDITIONER

Please read this installation manual completely before installing the product. Installation work must be performed in accordance with the national wiring standards by authorized personnel only.

Please retain this installation manual for future reference after reading it thoroughly.

CEILING CONCEALED DUCT

Original instruction

www.lghvac.com

www.lg.com

MFL68821907

Rev.04_012220

Copyright © 2018 - 2020 LG Electronics Inc. All Rights Reserved.

IMPORTANT!

Please read this instruction sheet completely before installing the product.

This air conditioning system meets strict safety and operating standards. As the installer or service person, it is an important part of your job to install or service the system so it operates safely and efficiently.

!WARNING

•The information contained in the manual is intended for use by a qualified service technician familiar with safety procedures and equipped with the proper tools and test instruments.

•Failure to carefully read and follow all instructions in this manual can result in equipment malfunction, property damage, personal injury and/or death.

Caution: Improper installation, adjustment, alteration, service or maintenance can void the warranty.The weight of the condensing unit requires caution and proper handling procedures when lifting or moving to avoid personal injury. Use care to avoid contact with sharp or pointed edges.

Safety Precautions

•Always wear safety eye wear and work gloves when installing equipment.

•Never assume electrical power is disconnected. Check with meter and equipment.

•Keep hands out of fan areas when power is connected to equipment.

•R-410A causes frostbite burns.

•R-410A is toxic when burned.

Note to installing dealer: The Owners Instructions and Warranty are to be given to the owner or prominently displayed near the indoor Furnace/Air Handler Unit.

! WARNING

When wiring:

Electrical shock can cause severe personal injury or death. Only a qualified, experienced electrician should attempt to wire this system.

•Do not supply power to the unit until all wiring and tubing are completed or reconnected and checked.

•Highly dangerous electrical voltages are used in this system. Carefully refer to the wiring diagram and these instructions when wiring. Improper connections and inadequate grounding can cause accidental injury or death.

•Ground the unit following local electrical codes.

•Connect all wiring tightly. Loose wiring may cause overheating at connection points and a possible fire hazard.

When transporting:

Be careful when picking up and moving the indoor and outdoor units. Get a partner to help, and bend your knees when lifting to reduce strain on your back. Sharp edges or thin aluminum fins on the air conditioner can cut your finger.

When installing...

... in a wall: Make sure the wall is strong enough to hold the unit's weight. It may be necessary to construct a strong wood or metal frame to provide added support.

... in a room: Properly insulate any tubing run inside a room to prevent "sweating" that can cause dripping and water damage to wall and floors.

... in moist or uneven locatinons: Use a raised concrete pad or concrete blocks provide a solid, level foundation for the outdoor unit. This prevents water damage and abnormal vibration.

... in an area with high winds: Securely anchor the outdoor unit down with bolts and a metal frame. Provide a suitable air baffle.

... in a snowy area(for Heat Pump Model): Install the outdoor unit on a raised platform that is higher than drifting snow. Provide snow vents.

When connecting refrigerant tubing:

•Keep all tubing runs as short as possible.

•Use the flare method for connecting tubing.

•Check carefully for leaks before starting the test run.

When servicing:

•Turn the power OFF at the main power box(mains) before opening the unit to check or repair electrical parts and wiring.

•Keep your fingers and clothing away from any moving parts.

•Clean up the site after you finish, remembering to check that no metal scraps or bits of wiring have been left inside the unit being serviced.

2 Indoor Unit

TABLE OF CONTENTS

4FEATURES

5SAFETY INSTRUCTIONS

8INSTALLATION

8Selection of the best location

9 Ceiling dimension and hanging bolt location

10 Indoor Unit Installation

10 Wiring Connection

14 Flaring work

14Checking the Drainage

15Indoor Unit Drain Piping

17DIP Switch Setting

18Group Control Setting

22Airborne Noise Emission

22Limiting concentration

23 HOW TO SET E.S.P?

Table of contents

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Installation Manual 3

Features

Features

Air inlet vents

Air outlet vents

Remote Controller

(Accessory)

Installation Tool

Name	Drain hose	Clamp metal	Washer for	Clamp	Insulation for	(Other)
			hanging bracket	(Tie Wrap)	fitting
Quantity	1 EA	2 EA	8 EA	4 EA	1 SET	• Owner's manual
						• Installation manual
Shape					for gas pipe
					for liquid pipe

4 Indoor Unit

Safety Instructions

Safety Instructions

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.

!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.

! WARNING

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.

-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

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Installation Manual 5

Safety Instructions

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 There is risk of fire, failure of the product, 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, or 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.

6 Indoor Unit

Safety Instructions

! 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.

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.

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Installation Manual 7

Installation

Installation

Read completely, then follow step by step.

Selection of the best location

Install the air conditioner in the location that satisfies the following conditions.

•The place shall easily bear a load exceeding four times the indoor unit’s weight.

•The place shall be able to inspect the unit as the figure.

•The place where the unit shall be leveled.

•The place shall allow easy water drainage.

•The place shall easily connect with the outdoor unit.

•The place where the unit is not affected by an electrical noise.

•The place where air circulation in the room will be good .

•There should not be any heat source or steam near the unit.

Top view [Unit: mm(inch)]	Inspection hole(1)
Air inlet vents600(23-5/8) x 600(23-5/8)
	Control box

600		1 000	600
(23-5/8) Air outlet		(39-3/8)	(23-5/8)
Inspection hole(2)	vents	Front
600(23-5/8) x 600(23-5/8)
Front view [Unit: mm(inch)]

More than 20(25/32)

! CAUTION

In case that the unit is installed near the sea, the installation parts may be corroded by salt, The installation parts (and the unit) should be taken appropriate anti-corrosion measures.

[Inspection Hole Standard]

	Number of	Distance between	Remarks
	inspection hole	false ceiling & actual ceiling
	1	More than 100 cm (39-3/8 inch)	Sufficient space in the ceiling for servicing.
	2	20 cm (7-7/8 inch) to	Insufficient space. Difficult for servicing
		100 cm (39-3/8 inch)
	Hole size should be more	Less than 20 cm (7-7/8 inch)	Minimum height for motor replacement.
	than the size of IDU.

8 Indoor Unit

		Installation
Ceiling dimension and hanging bolt location			<![if ! IE]> <![endif]>ENGLISH
ν Installation of Unit	E
Install the unit above the ceiling correctly.		G
	<![if ! IE]> <![endif]>D C
POSITION OF SUSPENSION BOLT
• Apply a joint-canvas between the unit and duct	J
to absorb unnecessary vibration.
	A
• Install the unit leaning to a drainage hole side	B
as a figure for easy water drainage.
• A place where the unit will be leveled and that	<![if ! IE]> <![endif]>F I
can support the weight of the unit.	H
• A place where the unit can withstand its vibration.		Drain hole
• A place where service can be easily performed.
	W3/8 or M10 Nut	X 4
	W3/8 or M10 washer X 4
	W3/8 or M10 washer X 4
	W3/8 or M10 Nut	X 8

Unit:mm(inch)

Dimension	B	C	D	E	F	G	H	I	J
A

Chassis name

	M1	933.4	971.69	619.2	719.6	45.2	269.3	15.2	856.4	168.8	901.6
		(36-3/4)	(38-1/4)	(24-3/8)	(28-11/32)	(1-3/4)	(10-19/32)	(19/32)	(33-23/32) (6-21/32)		(35-1/2)
	M2	1 283.4	1 321.6	619.2	700	30	270	15.2	1 208	201.4	1 250
		(50-17/32) (52-1/32)		(24-3/8)	(27-9/16)	(1-3/16)	(10-5/8)	(19/32)	(47-9/16)	(7-15/16)	(49-7/32)
	M3	1 283.4	1 321.6	619.2	700	30	360	15.2	1 208	291.4	1 250
		(50-17/32)	(52-1/32)	(24-3/8)	(27-9/16)	(1-3/16)	(14-3/16)	(19/32)	(47-9/16)	(11-15/32)	(49-7/32)

NOTICE

• Throughly study the following installation locations:

1.In such places as restaurants and kitchens, considerable amount of oil steam and flour adhere to the fan, the fin of the heat exchanger, resulting in heat exchange reduction, spraying, dispersing of water drops, etc. In these cases, take the following actions:

•Make sure that the ventilation fan for smoke-collecting hood on a cooking table has sufficient capacity so that it draws oily steam which should not flow into the suction of the air conditioner.

•Make enough distance from a cooking room to install the air conditioner in such a place where it may not suck in oil steam.

2.Avoid installing air conditioner in such circumstances where cutting oil mist or iron powder is in suspension in factories, etc.

3.Avoid places where inflammable gas is generated, flows in, is stored or vented.

4.Avoid places where sulfurous acid gas or corrosive gas is generated.

5.Avoid places near high frequency generators.

Installation Manual 9