LG MU4M27 INSTALLATION MANUAL

INSTALLATION MANUAL

MULTI

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.

www.lg.com

MFL68883812

Rev.01_042519

Copyright © 2017 - 2019 LG Electronics Inc. All Rights Reserved.

ENGLISH

РУССКИЙ ЯЗЫК

УКРАÏНСЬКА

TIPS FOR SAVING ENERGY

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TIPS FOR SAVING ENERGY

Here are some tips that will help you minimize the power consumption when you use the air
conditioner. You can use your air conditioner more efficiently by referring to the instructions
below:

• Do not cool excessively indoors. This may be harmful to your health and may consume more
electricity.

• Block sunlight with blinds or curtains while you are operating the air conditioner.

• Keep doors or windows closed tightly while you are operating the air conditioner.

• Adjust the direction of the air flow vertically or horizontally to circulate indoor air.

• Speed up the fan to cool or warm indoor air quickly, in a short period of time.

• Open windows regularly for ventilation as the indoor air quality may deteriorate if the air
conditioner is used for many hours.

• Clean the air filter once every 2 weeks. Dust and impurities collected in the air filter may block the
air flow or weaken the cooling / dehumidifying functions.

For your records

Staple your receipt to this page in case you need it to prove the date of purchase or for warranty
purposes. Write the model number and the serial number here:

Model number :

Serial number :

You can find them labeled on the side of each unit.

Dealer’s name :

Date of purchase :

IMPORTANT SAFETY INSTRUCTIONS

IMPORTANT SAFETY INSTRUCTIONS

READ ALL INSTRUCTIONS BEFORE USING THE APPLIANCE.

Always comply with the following precautions to avoid dangerous situations and ensure peak
performance of your product.

WARNING

!

It can result in serious injury or death when the directions are ignored.

CAUTION

!

It can result in minor injury or product damage when the directions are ignored.

WARNING

!

• Installation or repairs made by unqualified persons can result in hazards to you and others.

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

• 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.

Installation

• Do not use a defective or underrated circuit breaker. Use the correctly rated breaker and fuse.
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 by yourself. There is risk of fire or electric
shock.

• Always ground the product as per the wiring diagram. Do not connect the ground wire to gas
or water pipes lightening rod or telephone ground wire. 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
due to dust , water etc.

• Use the correctly rated breaker or fuse. There is risk of fire or electric shock.

• Do not modify or extend the power cable. If the power cable or cord has scrathes or skin
peeled off or deteriorated then it must be replaced. There is risk of fire or electric shock.

• For installation, removal or reinstall , 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. Be sure that the installation area
does not deteriorate with age. It may cause product to fall.

• Never install the outdoor unit on a moving base or a place from where it can fall down.
The falling outdoor unit can cause damage or injury or even death of a person.

• In outdoor unit the step-up capacitor supplies high voltage electricity to the electrical
components. Be sure to discharge the capacitor completely before conducting the repair
work.
An charged capacitor can cause electrical shock.

• When installing the unit, use the installation kit provided with the product. Otherwise the unit
may fall and cause severe injury.

• 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 cause heat generation or fire.

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Operation

IMPORTANT SAFETY INSTRUCTIONS

• Safely dispose off the packing materials. Like screws, nails, batteries, broken things etc after
installation or svc and then tear away and throw away the plastic packaging bags. Children
may play with them and cause injury.

• Be sure to check the refrigerant to be used. Please read the label on the product. Incorrect
refrigerant used can prevent the normal operation of the unit.

• When the product is soaked (flooded or submerged) in water, contact an Authorized Service Center
for repair before using it again. There is risk of fire or eletric shock.

• Be sure to use only those parts which are listed in the svc parts list. Never attempt to modify the
equipment. The use of inappropriate parts can cause an electrical shock, excessive heat generation
or fire.

• Do not touch, operate, or repair the product with wet hands. Hold the plug by hand when taking out.
There is risk of electric shock or fire.

• Do not place a heater or other heating appliances near the power cable. There is risk of fire and
electric shock.

• Do not allow water to run into electric parts. Install the unit away from water sources. There is risk
of fire, failure of the product, or electric shock.

• Do not store or use or even allow flammable gas or combustibles near the product. There is risk of
fire.

• Do not use the product in a tightly closed space for a long time. Perform ventilation regularly.
Oxygen deficiency could occur and hence harm your health.

• Do not open the front grille 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.

• If strange sound, smell or smoke comes from product. Immediately turn the breaker off or
disconnect the power supply cable. There is risk of electric shock or fire.

• Ventilate the product room from time to time when operating it together with a stove, or heating
element etc. Oxygen deficiency can occur and hence harm your health.

• When the product is not to 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 especially kids could step on or fall onto the outdoor unit. This
could result in personal injury and product damage.

• 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.

• When flammable gas leaks, turn off the gas and open a window for ventilation befor turning on the
product. Do not use the telephone or turn switches on or off. There is risk of explosion or fire.

CAUTION

!

Installation

• Two or more people must 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.

• Install the drain hose to ensure that the condensed water is drained away properly. A bad
connection may cause water leakage.

• Keep level even when installing the product. To avoid vibration or noise.

• Do not install the product where the noise or hot air from the outdoor unit could damage or disturb
the neighborhoods. It may cause a problem for your neighbors and hence dispute.

IMPORTANT SAFETY INSTRUCTIONS

• Always check for gas (refrigerant) leakage after installation or repair of product. Low refrigerant
levels may cause failure of product.

• Please install safely at a place that can sufficiently endure the weight of the product. (If the strength
is not sufficient, the product may fall and cause injury.)

• Means for disconnection must be incorporated in the fixed wiring in accordance with the wiring
rules.

Operation

• 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 or splashing water 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. 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 after cleaning. Clean the filter every two weeks or more often if
necessary. A dirty filter reduces the efficiency.

• Do not insert hands or other objects through the air inlet or outlet while the product is operating.
There are sharp and moving parts that could cause personal injury.

• Be cautious when unpacking and installing the product. Sharp edges could cause injury.

• If the refrigerant gas leaks during the repair, do not touch the leakaing refrigerant gas. The
refrigernat gas can cause frostbite (cold burn).

• Do not tilt the unit when removing or uninstalling it. The condensed water inside can spill.

• Do not mix air or gas other than the specified refrigerant used in the system. If air enters the
refrigerant system, an excessively high pressure results, causing equipment damage or injury.

• If the refrigerant gas leaks during the installation, ventilate the area immediately. Otherwise it can be
harmfull for your health.

• Dismantling the unit, treatment of the refrigerant oil and eventual parts should be done in
accordance with local and national standards.

• 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 product failure.

• Do not recharge or disassemble the batteries. Do not dispose off 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.

• 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.

• Do not expose your skin or kids or plants to the cool or hot air draft. This could harm to your health.

• 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, maintaining or repairing the product at an height. Be
careful and avoid personal injury.

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TABLE OF CONTENTS

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TABLE OF CONTENTS

2 TIPS FOR SAVING ENERGY
3 IMPORTANT SAFETY INSTRUCTIONS
7 INSTALLATION
8 INSTALLATION OF INDOOR, OUTDOOR UNIT

8 Select the best location
9 Fixing Installation Plate
10 Piping length and elevation
10 Refrigerant charge
11 Preparing work for Installation (ART COOL Type Only)

12 FLARING WORK AND CONNECTION OF PIPING

12 Flaring work
13 Connection of piping - Outdoor

14

CONNECTING THE CABLE BETWEEN INDOOR UNIT AND OUTDOOR UNIT

14 Connect the cable to the Indoor unit
16 Connect the cable to the Outdoor unit

18 FORMING THE PIPINGS

18 Forming the Piping

19 AIR PURGING AND EVACUATION

19 Checking method
20 Evacuation

21 INSTALLATION PI485
22 TEST RUNNING
23 FUNCTION

23 DIP S/W Setting
24 Forced Cooling Operation
25 Wiring Error Check
25 Saving Power Consumption
26 Night Quiet Mode
27 Mode Lock
27 SLC (Smart Load Control) Mode
28 PCB Display(14/16/18/21 k Model Only)

29 MAX COMBINATION CAPACITY

30 INSTALLATION GUIDE AT THE SEASIDE
30 SEASONAL WIND AND CAUTIONS IN WINTER

31 Model Designation
31 Airborne Noise Emission
31 Limiting concentration

Installation plate

Type "B" screws

Type "A" screw (6 EA) Type "A" screw (8 EA) Type "A" screw (7 EA)

Holder Remote Control

Type "A" screw and plastic anchors

INSTALLATION

Installation Parts

INSTALLATION

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Clearance of side discharge unit [Unit : mm(inch)]

Do not install the product where sufficient ventilation is not secured.
The performance may be decreased or the product may not be operated.

300(11-13/16)

or more

erom ro )8/3-93(000

500(19-11/16) or less

D

L

1 000(39-3/8)

or more

1

H

300(11-13/16)

or more

h In case of series or another installation, please refer to related PDB.

300(11-13/16)
or more

500(19-11/16) or less

600(23-19/32)
or more

600(23-19/32) or more

1 000(39-3/8) or more

(39-3/8) or more
000

1

300(11-13/16)

or more

300(11-13/16)
or more

2 000(78-3/4) or more

INSTALLATION OF INDOOR, OUTDOOR UNIT

more than

70 cm

more than

30 cm

more than

30 cm

more than

60 cm

more than 60 cm

more than

70 cm

more than

30 cm

more than 60 cm

more than

30 cm

more than

60 cm

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INSTALLATION OF INDOOR, OUTDOOR UNIT

Read completely, then follow step by step.
You need to select adequate installation
location considering the following conditions,
and make sure to acquire the consent of the
user.

Select the best location

Outdoor unit

- If an awning is built over the unit to prevent

direct sunlight or rain exposure, make sure
that heat radiation from the condenser is not
restricted.

- Ensure that the spaces indicated by arrows

around front, back and side of the unit.

- Do not place animals and plants in the path

of the warm air.

- Take the air conditioner weight into account

and select a place where noise and vibration
are minimum.

- Select a place so that the warm air and noise

from the air conditioner do not disturb
neighbors.

- Place that can sufficiently endure the weight

and vibration of the outdoor unit and where
even installation is possible.

-

Place that has no direct influence of snow or rain.

- Place with no danger of snowfall or icicle

drop.

- Place without weak floor or base such as

decrepit part of the building or with a lot of
snow accumulation.

Rooftop Installations

If the outdoor unit is installed on a roof
structure, be sure to level the unit. Ensure the
roof structure and anchoring method are
adequate for the unit location. Consult local
codes regarding rooftop mounting.

INSTALLATION OF INDOOR, OUTDOOR UNIT

Unit
Outline

Left Rear
Piping

Right Rear
Piping

Place a level on raised tab

(Unit : mm)

Installation plate

Ø 65

Ø 65

184

220

156

307

460 567

Installation plate

Left rear piping Right rear piping

Ø 65

Ø 65

105 mm

105 mm

65 mm

55 mm

45 mm

140 mm

Ø 65

65mm65mm

65 mm

45 mm

Ø 65

Installation plate

Left rear piping Right rear piping

Installation plate

Left rear piping Right rear piping

Ø 65

133 mm

101 mm

101 mm

Ø 65

100 mm

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Fixing Installation Plate

The wall you select should be strong and solid
enough to prevent vibration

1 Mount the installation plate on the wall

with type "A" screws. If mounting the unit
on a concrete wall, use anchor bolts.

- Mount the installation plate horizontally
by aligning the centerline using a level.

<Type 1>

2 Measure the wall and mark the centerline.

It is also important to use caution
concerning the location of the installation
plate-routing of the wiring to power outlets
is through the walls typically. Drilling the
hole through the wall for piping
connections must be done safely.

<Type 2>

Indoor Type

Wall mounted

/ART COOL

Mirror

<Type 1>

<Type 2>

<Type 3>

Capacity

(kBtu/h)

Type

5, 7, 9, 12, 15 1, 3

18, 24 2, 4

<Type 3>

<Type 4>

<Type 4>

INSTALLATION OF INDOOR, OUTDOOR UNIT

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Piping length and elevation

Multiple Piping Models (Unit: m)

Phase Capacity(kBtu/h) Total Length Max Length(A/B)

14/16 30 20 15 7.5

18 50 25 15 7.5

1Ø

21 50 25 15 7.5

24/27 70 25 15 7.5

30 75 25 15 7.5
40 85 25 15 7.5

A

!

Capacity is based on standard length and

h2

h1

maximum allowance length is on the
basis of reliability. If outdoor unit is at
higher elevation than the indoor units,
after 24 m of vertical height, 1 oil trap is
required.

Max Elevation

(h1)

CAUTION

In - In Elevation

(h2)

B

Multiple Piping Type

Refrigerant charge

The calculation of the additional charge should be taken in account for the length of extra pipe.

Multiple Piping Models (Unit: m)

Phase Capacity(kBtu/h)

14/16 7.5 20 30 20

18 7.5 25 50 20

1Ø

• Multiple Piping Models
Additional charge (g) = ((A Room Installation Length–Standard Length)x20 g/m

h CF = Max. number of connectable indoor unit–Total number of connected indoor unit

21 7.5 25 50 20

24/27 7.5 25 70 20

30 7.5 25 75 20
40 7.5 25 85 20

Standard

Length(m)

+(B Room Installation Length–Standard Length )x20 g/m+.. )

-CF(Correction Factor)x150

Max Piping for

one room(m)

Max total Piping

Length

Additional

Charge(g/m)