LG SVC Schematic

Air Conditioner

SVC MANUAL(General)

CAUTION

Before Servicing the unit, read the safety precautions in General SVC manual. Only for authorized service personnel.

Internal Use Only

http://biz.lgservice.com

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LGE Internal Use Only

Air Conditioner Service Manual

TABLE OF CONTENTS

Part 1 General Information ..........................................................................................................3

1. Safety Precautions........................................................................................................4

2. Model Line Up................................................................................................................7

3. Nomenclature ................................................................................................................8

Part 2 Functions & Controls......................................................................................................10

1. List of Functions & Accessory...................................................................................11

2. Air flow ........................................................................................................................14

3. Air purifying.................................................................................................................16

4. Installation Functions.................................................................................................17

5. Reliability .....................................................................................................................21

6. Convenience Functions & Controls .........................................................................22

7. Special Function & KIT...............................................................................................32

Part 3 Basic Control ..................................................................................................................35

1. Normal operation ........................................................................................................36

2 Compressor control ....................................................................................................36

3. EEV( Electronic Expansion Valve) control ...............................................................36

Part 4 Trouble Shooting ...........................................................................................................37

1. Self-diagnosis Function ............................................................................................38

2. Pump Down ................................................................................................................40

3. Evacuation (All amount of refrigerant leaked) ........................................................41

4. Gas Charging (After Evacuation)..............................................................................42

5. Cycle Part....................................................................................................................43

6. Electronic Parts..........................................................................................................44

Part 1 General Information

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LGE Internal Use Only

1. Safety Precautions ............................................................................................................4

2. Model Line Up .....................................................................................................................7

3. Nomenclature......................................................................................................................8

Part 1 General Information

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LGE Internal Use Only

1. Safety Precautions

1.1 Cautions in Repair

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 follow-

ing 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.

Dangerous Voltage

Be sure to disconnect the power cable plug from the plug socket before disassembling the equipment for a repair.Internal components and circuit boards are at main potential when the equipment is connected to the power cables. This voltage is extremely dangerous and may cause death or severe injury if come in contact with it.

Do not touch the discharging refrigerant gas during the repair work. The discharging refrigerant gas.The refrigerant gas can cause frostbite.

Release the refrigerant gas completely at a well-ventilated place first. Otherwise, when the pipe is disconnected, refrigerant gas or refrigerating machine oil discharges and it Can cause injury.

When the refrigerant gas leaks during work, execute ventilation. If the refrigerant gas touches to a fire, poisonous gas generates. A case of leakage of the refrigerant and the closed room full with gas is dangerous because a shortage of oxygen occurs. Be sure to execute ventilation.

When removing the front panel or cabinet, execute short-circuit and discharge between high voltage capacitor terminals. If discharge is not executed, an electric shock is caused by high voltage resulted in a death or injury.

Do not turn the air-conditioner ON or OFF by plugging or unplugging the power plug. There is risk of fire or electrical shock.

Part 1 General Information

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LGE Internal Use Only

Do not turn on the breaker under condition that front panel and cabinet are removed.

Be sure to earth the air conditioner with an earthing conductor connected to the earthing terminal.

Conduct repair works after checking that the refrigerating cycle section has cooled down sufficiently. Otherwise, working on the unit, the hot refrigerating cycle section can cause burns.

Do not tilt the unit when removing panels. Otherwise, the water inside the unit can spill and wet floor.

Do not use the welder in a well-ventilated place. Using the welder in an enclosed room can cause oxygen deficiency.

Be sure to turn off power switch before connect or disconnect connector, or parts damage may be occurred.

Do not use a defective or underrated circuit breaker. Use the correctly rated breaker and fuse. Otherwise there is a risk of fire or electric shock.

Install the panel and the cover of control box securely. Otherwise there is risk of fire or electric shock due to dust, water etc.

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.

Do not touch, operate, or repaire the product with wet hands. Hoding the plug by hand when taking out. Otherwise there is risk of electric shock or fire.

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.

Part 1 General Information

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LGE Internal Use Only

1.2 Inspections after Repair

Check to see if the parts are mounted correctly and wires are connected. Improper installation and connections can cause an electric shock or an injury.

Check the installation platform or frame has corroded. Corroded installation platform or frame can cause the unit to fall, resulting in injury.

Be sure to check the earth wire is correctly connected.

After the work has finished, be sure to do an insulation tset to check the resistance is 2[Mohm] or more between the charge section and the non-charge metal section (Earth position). If the resistance value is low, a disaster such as a leak or electric shock is caused at userʼs side.

Check the drainage of the indoor unit after the repair. If drainage is faulty the water to enter the room and wet floor.

Check to see if the power cable plug is not dirty or loose. If the plug is dust or loose it can cause an electrical shock or fire.

Do not use a joined power cable or extension cable, or share the same power outlet with other electrical appliances. otherwise, it can cause an electrical shock, excessive heat generation or fire.

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.

Do not block the inlet or outlet of air flow. It may cause product failure

Category

Chassis

Name

Capacity Index[kBtu/h]

18 24 36 42

Ceiling

Conceal

ed Duct

High

Static

Pressur

BG

BR

Ceiling

Cassette

4way

TP

TM

Part 1 General Information

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LGE Internal Use Only

2. Model Line Up

2.1 Indoor units

2.2 Outdoor units

DC Inverter

AUUW18GD2

[LUU187HV]

AUUW24GD2

[LUU247HV]

AUUW36GD2

[LUU367HV]

AUUW42GD2

[LUU427HV]

No. of connectable

indoor units

1

Total Capacity index of

conectable indoor

units(kBtu)

18 24 36 42

Power supply

1Ø, 203-230V, 60Hz

Chassis

ABNH24GGLA2

[LHN240HV]

ATNH18GPLE2

[LCN187HV]

ATNH24GPLE2

[LCN247HV]

ATNH36GMLE2

[LCN367HV]

ATNH42GMLE2

[LCN427HV]

ABNH36GRLA2

[LHN360HV]

Part 1 General Information

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LGE Internal Use Only

3. Nomenclature

3.1 Indoor Unit(Global)

Indoor Unit (Buyer)

Serial number

Function A : Basic, C/L : Plasma, E : Elevation grille

Panel Color for ART COOL V: Silver, G : Gold, H : White Silver, E : Red, 1 : Gallery

Panel Color for ARTCOO Mirror R : Mirror, V : Silver, W : White

Look L : Basic

Chassis name G : BG R : BR P : TP M : TM

Electrical rating G: 1Ø, 220-240V, 50Hz / 1Ø, 220V, 60Hz

Nominal Capacity Ex) 24,000 Btu/h Class → '24',

36,000 Btu/h Class → '36' Model type W/H : DC Inverter Heat pump

A*N / U*N : Indoor units using R410A * Indicates Product type

M : Only for Multi systems T : Ceiling Cassette

B : Ceiling Concealed Duct V : Ceiling Suspended & floor Q : Console

ABN H G24 LGA2

Nominal Capacity Ex) 24,000 Btu/h Class → '24',

36,000 Btu/h Class → '36'

L H N 024 H V

Inverter

Serial number

Indoor unit

Indoor unit type H : High static Duct C : Cassette

Heat Pump

Part 1 General Information

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LGE Internal Use Only

G

A U U W 2 4 D2

Model Type

D : Standard Inverter

Electric standard (Phase, Volts, Freq)

G: 1Ø, 220-240V, 50Hz / 1Ø, 220V, 60Hz 6:1Ø,220V-240V,50Hz 8:3Ø,380V-415V,50Hz

Serial number

Indicates that this is a

R410A outdoor unit

Model type

W : Inverter heat pump

Nominal cooling capacity in kBtu/h

18 : 24 : 30 : 36 : 42 : 48 : 60 :

18kBtu/h 24kBtu/h 30kBtu/h 36kBtu/h 42kBtu/h 48kBtu/h 60kBtu/h

Nominal Capacity Ex) 24,000 Btu/h Class → '24',

36,000 Btu/h Class → '36'

L U U 024 H V

Inverter

Serial number

Outdoor unit

Brand (LG)

Outdoor unit type Universal

Heat Pump

3.2 Outdoor Unit(Global)

Outdoor Unit (Buyer)

Part 2 Functions & Controls

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LGE Internal Use Only

Part 2 Functions & Controls

1. List of Functions & Accessory ......................................................................................11

1. Ceiling Concealed Duct Indoor......................................................................................11

2. 4-Way Ceiling Cassette Indoor .....................................................................................12

3. Outdoor .........................................................................................................................13

2. Air flow ...........................................................................................................................14

2.1 Auto swing (left & right)...............................................................................................14

2.2 Auto swing (up & down) ..............................................................................................14

2.3 Chaos swing (up/down)...............................................................................................14

2.4 Air flow step.................................................................................................................15

2.5 Chaos wind (auto wind)...............................................................................................15

2.6 Jet Cool Mode Operation ............................................................................................15

2.7 Swirl wind Swing .........................................................................................................15

3. Air purifying ....................................................................................................................16

3.1 PLASMA Air Purifying System ....................................................................................16

4. Installation Functions ....................................................................................................17

4.1 E.S.P. (External Static Pressure) Setting (DUCT).......................................................17

4.2 E.S.P. (External Static Pressure) Setting (Cassette)...................................................19

5. Reliability ........................................................................................................................21

5.1 Hot start.......................................................................................................................21

5.2 Self-diagnosis Function...............................................................................................21

5.3 Soft dry operation........................................................................................................21

6. Convenience Functions & Controls .............................................................................22

6.1 Cooling & heating Operations .....................................................................................22

6.2 Auto cleaning operation ..............................................................................................23

6.3 Auto changeover operation.........................................................................................23

6.4 Auto restart Opeartion.................................................................................................23

6.5 Child Lock Function.....................................................................................................24

6.6 Forced operation.........................................................................................................25

6.7 Group Control..............................................................................................................26

6.8 Sleep Timer Operation................................................................................................27

6.9 Timer(On/Off) ..............................................................................................................27

6.10 Weekly Program........................................................................................................28

6.11 Two Thermistor Control .............................................................................................30

7. Special Function.............................................................................................................32

7.1 Low Ambient control...................................................................................................32

7.2 Space control ..............................................................................................................32

7.3 Auto Elevation Grille....................................................................................................32

Part 2 Functions & Controls

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LGE Internal Use Only

1. List of Functions & Accessory

1. Ceiling Concealed Duct Indoor

Category Functions Remark

Air flow

Air supply outlet 1 Airflow direction control (left & right) X Airflow direction control (up & down) X Auto swing (left & right) X Auto swing (up & down) X Airflow steps (fan/cool/heat) 3 / 3 / 3 Chaos wind(auto wind) X Jet cool/heat X / X Swirl wind X

Air purifying

Triple filter (Deodorizing) X Plasma air purifier X Allergy Safe filter X Long-life prefilter (washable / anti-fungus) X

Installation

Drain pump O E.S.P. control O Electric heater X High ceiling operation X Auto Elevation Grille X

Reliability

Hot start O Self diagnosis O Soft dry operation O

Convenience

Auto changeover O Auto cleaning X Auto operation(artificial intelligence) X Auto Restart O Child lock O Forced operation X Group control O Sleep mode O Timer(on/off) O Timer(weekly) O Two thermistor control O

Individual

control

Standard Wired remote controller

PQRCVSL0/PQRCVSL0QW Deluxe wired remote controller X Simple wired remote controller O Simple Wired remote controller(for hotel use) X Wireless remote controller X

Network

function

General central controller (Non LGAP) X Network Solution(LGAP) O Dry contact

PQDSA(1) / PQDSB(1) / PQDSBC

PI 485(for Indoor Unit) X

Special

function kit

Zone controller ABZCA CTI(Communication transfer interface) X Electronic thermostat X

Others Remote temperature sensor PQRSTA0

Part 2 Functions & Controls

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LGE Internal Use Only

Air supply outlet 4 Airflow direction control(left & right) Airflow direction control(up & down) Auto Auto swing(left & right) X Auto swing(up & down) O Airflow steps(fan/cool/heat) 4 / 5 / 4 Chaos swing X Chaos wind(auto wind) Jet cool(Power wind) O Swirl wind O Deodorizing filter Plasma air purifier PTPKM0 Prefilter(washable / anti-fungus) O Drain pump O E.S.P. control O Electric heater(operation) High ceiling operation O Hot start O Self diagnosis O Soft dry operation O Auto changeover O Auto cleaning X Auto operation(artificial intelligence) X Auto restart operation O Child lock O Forced operation O Group control O Sleep mode O Timer(on/off) O Timer(weekly) O Two thermistor control O Standard wired remote controller PCRCUSZ0 Picto wired remote controller PQRCUSA1 Deluxe wired remote controller PQRCUDS0 Simple wired remote controller PQRCUCA0 Wired remote controller(for hotel use) PQRCFCS0 Wireless remote controller(simple) X Wireless LCD remote control PQWRHSF0(H/P) PQWRHDF0(H/P) General central controller (Non LGAP) X Dry contact PQDSB Network Soluation(LGAP) O PDI(power distribution indicator) X PI 485 PSNFP14A0 Zone control X CTIE X Electro thermostat X Thermistor Home net Support -

Category Function Remark

Air flow

Air purifying

Reliability

Individual

control

Convenience

Installation

CAC network

function

Special

function kit

Others

2. 4-Way Ceiling Cassette Indoor

Part 2 Functions & Controls

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LGE Internal Use Only

3. Outdoor

Category Functions

AUUW18GD2

[LUU187HV]

AUUW24GD2

[LUU247HV]

AUUW36GD2

[LUU367HV]

AUUW42GD2

[LUU427HV]

Reliability

Defrost / Deicing OOOO High pressure switch X X X X Low pressure switch X X X X Phase protection X X X X Restart delay (3-minutes) OOOO Release Control OOOO Self diagnosis OOOO Soft start OOOO

Test function OOOO Convenience Night Silent Operation OOOO CAC network function

Network soluation(LGAP) OOOO

`

Device

AUUW18GD2

[LUU187HV]

AUUW24GD2

[LUU247HV]

AUUW36GD2

[LUU367HV]

AUUW42GD2

[LUU427HV]

Central Controller

Simple Controller PQCSB101S0 PQCSB101S0 PQCSB101S0 PQCSB101S0

Function controller

PQCSB101S0 + PQCSC101S0 PQCSB101S0 + PQCSC101S0 PQCSB101S0 + PQCSC101S0 PQCSB101S0 + PQCSC101S0

Function Scheduler

PQCSB101S0 + PQCSD130A0 PQCSB101S0 + PQCSD130A0 PQCSB101S0 + PQCSD130A0 PQCSB101S0 + PQCSD130A0 AC Ez PQCSZ250S0 PQCSZ250S0 PQCSZ250S0 PQCSZ250S0 AC Smart ll PQCSW320A1E PQCSW320A1E PQCSW320A1E PQCSW320A1E Option Kit (SD card type)

PQCSE341A0 / PQCSE342A0 PQCSE341A0 / PQCSE342A0 PQCSE341A0 / PQCSE342A0 PQCSE341A0 / PQCSE342A0 ACP(Advanced Control Platform)

PQCPA11A0E /

PQCPB11A0E

PQCPA11A0E /

PQCPB11A0E

PQCPA11A0E /

PQCPB11A0E

PQCPA11A0E /

PQCPB11A0E

AC Manager PQCSS520A0E PQCSS520A0E PQCSS520A0E PQCSS520A0E PI485 PMNFP14A0/PMNFP14A1 PMNFP14A0/PMNFP14A1 PMNFP14A0/PMNFP14A1 PMNFP14A0/PMNFP14A1 DO(Digital Output) Kit PQNFP00T0 PQNFP00T0 PQNFP00T0 PQNFP00T0

BNU (Building Network Unit)

LONWORKS Gateway PQNFB16A1 PQNFB16A1 PQNFB16A1 PQNFB16A1 BACnet Gateway PQNFB17B0 PQNFB17B0 PQNFB17B0 PQNFB17B0

Installation

Y branch X X X X Header branch X X X X Air Guide X X X X

ODU Dry Contact X X X X Low Ambient Kit O (Logical operation) O (Logical operation) O (Logical operation) O (Logical operation)

Part 2 Functions & Controls

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LGE Internal Use Only

2. Air flow

2.1 Auto swing (left & right)

• By the horizontal airflow direction control key input, the left/right louver automatically operates with the auto swing or it is fixed to the desired direction.

2.2 Auto swing (up & down)

• By the auto swing key input, the upper/lower vane automatically operates with the auto swing or it is fixed to the desired direction.

2.3 Chaos swing (up/down)

• By the Chaos swing key input, the upper/lower vane automatically operates with the chaos swing or it is fixed to the desired direction.

RightLeft

110° ~ 120°

Close

110° ~ 120°

Open

CLOSED

Mode9

Mode8

Mode7

Mode6

Mode5

Mode4

Mode3

Mode2

110~120°

7~8°

OPEN

Part 2 Functions & Controls

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LGE Internal Use Only

NOTE: Some Models are different by swing width and swing pattern.

2.4 Air flow step

• Indoor fan motor control have 6 steps.

• Air volume is controlled "SH", "H", "Med", Low" by remote controller.

• "LL" step is selected automatically in Hot start operation.

2.5 Chaos wind (auto wind)

• When "Auto" step selected and then operated, the high, medium, or low speed of the airflow mode is operated for 2~15 sec. randomly by the Chaos Simulation

2.6 Jet Cool Mode Operation

• While in heating mode or Fuzzy operation, the Jet Cool key cannot be input. When it is input while in the other mode operation (cooling, dehumidification, ventilation), the Jet Cool mode is operated.

• In the Jet Cool mode, the indoor fan is operated at super-high speed for 30 min. at cooling mode operation.

• In the Jet Cool mode operation, the room temperature is controlled to the setting temperature, 18°C.

• When the sleep timer mode is input while in the Jet Cool mode operation, the Jet Cool mode has the priority.

• When the Jet Cool key is input, the upper/lower vanes are reset to those of the initial cooling mode and then operated in order that the air outflow could reach further.

2.7 Swirl wind Swing

• It is the function for comfort cooling/heating operation.

• The diagonal two louvers are opened the more larger than the other louvers. After one minute, it is opposite.

• Comparison of Air Flow Types

4-Open (conventional) Swirl Swing (New)

LL Very low, In heating mode

L Low

M Med

H High

SH Super high

Auto Chaos wind

Step Discription

Vane 4

Vane 2

Vane 1 Vane 3

Part 2 Functions & Controls

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LGE Internal Use Only

3.1 PLASMA Air Purifying System (Optional)

The PLASMA Air Purifying System not only removes microscopic contaminants and dust, but also removes house mites, pollen, and pet fur to help prevent allergic diseases like asthma. This filter that can be used over and over again by simply washing with water.

3. Air purifying

Ionizer

Photo-Catalyst Coated Mesh

Dust particles

Odour

Dust electrode discharge

Odour molecule

Generating plasma

+

Polluted Air

Purified fresh Air

+4.8KV discharge

+

Part 2 Functions & Controls

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LGE Internal Use Only

4.1 E.S.P. (External Static Pressure) Setting (DUCT)

4. Installation Functions

This is the function that decides the strength of the wind for each wind level and because this function is to make the installation easier.

• If you set ESP incorrectly, the air conditioner may malfunction.

• This setting must be carried out by a certificated-technician.

• Precaution shall be taken not to alter the E.S.P value corresponded to each air flow section.

• E.S.P value can be varied according to the products.

• In the case of going to the next air flow rate stage by pressing the fan-speed button during the setup of the E.S.P value, the E.S.P value of previous air flow rate will be maintained by remembering the E.S.P value prior to the shift.

TEMP

FAN

SPEED

OPER MODE

When pressing the button and

1

button simultaneously for more than 3 seconds, the system will be entered into the installer setting mode.

- After entering into the installer setting mode, select the E.S.P code value by pressing the button.

* E.S.P code value : 03

Select the desired air flow rate with

2

3

4

5

FAN

SPEED

the button. Whenever pressing

FAN

the button, [SLo→Lo→Med→Hi→Po] will

SPEED

be indicated.

Select the desired air flow rate value with the temperature up(s), down(t) button. * E.S.P value range : 0~255

-

E.S.P value will be indicated at the upper

right section of the display window.

When pressing the button, currently established E.S.P value will be set up.

When pressing the button and button simultaneously for more than 3 seconds after the setting has been completed, the setting mode will be released.

- If there isn’t any button input for more than

25 seconds, the installer setting mode will also be released.

OPER MODE

Part 2 Functions & Controls

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LGE Internal Use Only

E.S.P. setting value (reference)

[ Notes ]

1. To get the desired Airflow & E.S.P. combination from the table set the matching value from the table. Value other than that in table will not give the combinations of airflow & E.S.P. which are mentioned in the table.

2. Table data is based at 230V. According to the fluctuation of voltage, air flow rate varies.

Table 1

Capacity Step CFM

Static Pressure(Pa)

24.5 39.2 58.8 78.4 98

Setting Value

24K

HIGH 688 900 970 1080 1190 1260

MID 600 860 930 1050 1150 1230

LOW 565 820 900 1020 1120 1200

36K

HIGH 1130 - 960 1030 1090 1150

MID 950 - 850 960 1020 1090

LOW 706 - 760 850 950 1000

Part 2 Functions & Controls

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LGE Internal Use Only

4.2 E.S.P. (External Static Pressure) Setting (Cassette)

This function is applied to only duct type. Setting this in other cases will cause malfunction.

Pressure selection

Function

Zone state ESP standard value 01 V-H Variable High 02 F-H Fixed High 03 V-L Variable Low 04 F-L Fixed Low

Press button for 4 seconds to enter the installer

1

setting mode until timer segment displays “01:01”.

If pressing button repeatedly, it moves to static pressure

2

selection menu as picture below.

Select static pressure by pressing button.

3

(01:V-H, 02:F-H, 03:V-L, 04:F-L)

Function Code Pressure

Press button to save.

4

Pressing button will exit settings mode.

5

❈ After setup, it automatically gets out of setup mode if there is no button

input for 25 seconds.

❈ When exiting without pressing set button, the manipulated value is not

reflected.

Part 2 Functions & Controls

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LGE Internal Use Only

If entering into ESP setup mode by using button, it indicates as the picture below.

2

Select ESP fan step by pressing button. (01: very low, 02: low, 03: medium, 04: high, 05: very high)

3

Move to ESP value setting by pressing button. (It is 000 when delivering from the warehouse.)

4

Press button to setup ESP value.

(It is possible to setup ESP value from 1 to 255, and 1 is the smallest and 255 is the biggest.)

5

Function code, ESP code

ESP value

If pressing button long for 3 seconds, it enters into remote controller setter setup mode.

- If pressing once shortly, it enters into user setup mode. Please press more than 3 seconds for sure.

1

Function Code ESP value

ESP step

Function code, ESP code

ESP value

Press button to save.

7

Select ESP fan step again by using button and setup ESP value, as No. 4 and 5, that corresponds each wind flow

6

Press button to exit. ❈ After setup, it automatically gets out of setup mode if there is no button

input for 25 seconds.

❈ When exiting without pressing set button, the manipulated value is not

reflected.

8

• If you set ESP incorrectly, the air conditioner may malfunction.

• This setting must be carried out by a certificated-technician.

This is the function that decides the strength of the wind for each wind level and because this function is to make the installation easier.

•

When setting ESP value on the product without very weak wind or power wind function, it may not work.

• Please be careful not to change the ESP value for each fan step.

• It does not work to setup ESP value for very low/power step for some products.

• ESP value is available for specific range belongs to the product.

Part 2 Functions & Controls

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LGE Internal Use Only

5.1 Hot start

• When heating is started, the indoor fan is stopped or very slow to prevent the cold air carry out

• When the temp. of heat exchanger reach 30°C(model by model), indoor fan is started.

5.2 Self-diagnosis Function

• The air conditioner installed can self-diagnosed its error status and then transmits the result to the central control. Therefore, a rapid countermeasure against failure of the air conditioner allows easy management and increases the usage life of air conditioner.

• Refer to trouble shooting guide.

5.3 Soft dry operation

• When the dehumidification operation input by the remote control is received, the intake air temperature is detected and the setting temp is automatically set according to the intake air temperature.

• While compressor off, the indoor fan repeats low airflow speed and stop.

• While the intake air temp is between compressor on temp. and compressor off temp., 10-min dehumidification operation and 4-min compressor off repeat.

Compressor ON Temp. ‘ Setting Temp+0.5°C Compressor OFF Temp. ‘ Setting Temp-0.5°C

• In 10-min dehumidification operation, the indoor fan operates with the low airflow speed.

5. Reliability

Intake air Temp. Setting Temp.

26°C ≤ intake air temp. 25°C

24°C ≤ intake air temp.< 26°C intake air temp. -1°C 22°C ≤ intake air temp. < 24°C intake air temp. -0.5°C 18°C ≤ intake air temp. < 22°C intake air temp.

intake air temp. < 18°C 18°C

Part 2 Functions & Controls

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LGE Internal Use Only

6.1 Cooling & heating Operations

6.1.1 Cooling Mode

• Operating frequency of compressor depends on the load condition, like the difference between the room temp. and the set temp., frequency restrictions.

• If the compressor operates at some frequency, the operating frequency of compressor cannot be changed within 30 seconds. ( not emergency conditions)

• Compressor turned off when

- intake air temperature is in between ±0.5°C of the setting temp. limit for three minutes continuously.

- intake air temperature reaches below 1.0°C of the temperature of setting temp..

• Compressors three minutes time delay.

- After compressor off, the compressor can restart minimum 3 minutes later.

6. Convenience Functions & Controls

6.1.2 Heating Mode

• Operating frequency of compressor depend on the load condition, The difference between the room temp. and set temp., frequency restrictions.

• If compressor operates at some frequency, the operating frequency of compressor cannot be changed within 30 seconds.

• Condition of compressor turned off

- When intake air temperature reaches +4°C above the setting temperature.

• Condition of compressor turned on

- When intake air temperature reaches +2°C above the setting temperature.

* Condition of indoor fan turned off

- While in compressor on : indoor pipe temp. < 20°C

- While in compressor off : indoor pipe temp. < 30°C

• While in defrost control, between the indoor and outdoor fans are turned off.

• Compressor 2minutes delay

- After compressor off, the compressor can restart minimum 2 minutes later.

CST/Duct/CVT type indoor unit matched with

Universal Outdoor unit

CST/ Duct/CVT type indoor unit

matched with Single Outdoor unit/Multi

Outdoor unit/Multi V Outdoor unit

Thermo ON : +2 °C above setting temp. Thermo OFF : +4 °C above setting temp.

Thermo ON : Setting temp. Thermo OFF : +3 °C above setting temp.

NOTE: Some Models are different by temperature of thermo ON/OFF.

Part 2 Functions & Controls

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LGE Internal Use Only

6.4 Auto restart Operation

• Whenever there is electricity failure to the unit, and after resumption of the power, unit will start in the same mode prior to the power failure. Memorized condition are on / off condition, operating mode (cooling/ heating), set temperature and fan speed. The unit will memorize the above conditions and start with same memorized condition.

6.2 Auto cleaning operation

• Function used to perform Self Cleaning to prevent the Unit from Fungus and bad odor.

• Used after the Cooling Operation before turning the unit off, clean the Evaporator and keep it dry for the next operation.

• The function is easy to operate as it is accessed through the Remote controller.

Unit

Operation

ON

OFF

Comp.

Indoor

Fan

ON

OFF

ON

OFF

Setting step

OFFL Low

Setting step

(Cooling Only)

6.3 Auto changeover operation

• The air conditioner changes the operation mode automatically to keep indoor temperature.

• When room temperature vary over ±2°C with respect to setting temperature, air conditioner keeps the room temperature in ±2°C with respect to setting temperature by auto change mode.

+4°C +2°C

+0.5°C

SET Temp.

-0.5°C

-2°C

Cooling operation

Heating operation Cooling

operation

Switching point

Heating thermo off

Cooling thermo off

Switching point

Part 2 Functions & Controls

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LGE Internal Use Only

6.5 Child Lock Function

It is the function to use preventing children or others from careless using.

During the operation, when pressing the

TEMP

FAN

SPEED

OPER MODE

1

button and button for approx. 3 seconds, the ‘Child Lock’ Function can be used.

-

At the time of initial setting of the ‘Child Lock’, the ‘CL’ Will be indicated approx. 3 seconds at the temperature Display section before resuming to the previous mode. After the setting of the ‘CL’, if another button is setup, the button can not be recognized as the ‘CL’ is indicated at the temperature display section for approx. 3 seconds.

If the ‘CL’ function is wanted to be used

2

under the operation standby state, press the button and Button for approx. 3 seconds under the standby mode state and the system will be the ‘CL’ state.

FAN

SPEED

FAN

SPEED

As for the releasing method, when pressing

3

the Button and button for approx. 3 seconds, the ‘CL’ function can be released.

Press button repeatedly until

1

the is flashing.

If moving to 'setup' icon area by using button,

2

'setup' icon blinks, and child lock function is setup if pressing button at that time.

When cancelling lock function, if moving to 'cancel' icon by pressing

3

button and then, pressing button, child lock function is cancelled.

Press button to exit.

4

❈ After setup, it automatically gets out of setup mode if there is no

button input for 25 seconds.

❈ When exiting without pressing set button, the manipulated value is

not reflected.

FAN

SPEED

Part 2 Functions & Controls

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LGE Internal Use Only

6.6 Forced operation

• To operate the appliance by force in case when the remote control is lost, the forced operation selection switch is on the main unit of the appliance, and operate the appliance in the standard conditions.

• The operating condition is set according to the outdoor temp. and intake air temperature as follows.

• The unit select the last operation mode in 3 hours.

• Operating procedures when the remote control can't be used is as follows :

- The operation will be started if the ON/OFF button is pressed.

- If you want to stop operation, re-press the button.

Indoor temp.

over 24°C

21~24°C

below 21°C

Setting temp.

22°C

23°C

24°C

Setting speed of

indoor fan

High speed

Operating Mode

Cooling

Healthy Dehumidification

Heating

Part 2 Functions & Controls

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LGE Internal Use Only

6.7 Group Control

1. When installing more than 2 units of air conditioner to one wired remote controller, please connect as the right figure.

• If it is not event communication indoor unit, set the unit as slave.

• Check for event communication through the product manual.

2. When installing more than 2 wired remote controllers to one air conditioner, please connect as the right picture.

• When installing more than 2 units of wired remote controller to one air

conditioner, set one wired remote controller as master and the others all as slaves, as shown in the right picture.

• You cannot control the group as shown in the right for some products.

•

Refer to the product manual for more detail.

When controlling multiple indoor units with event communication function with one remote controller, you must change the master/slave setting from the indoor unit.

- Indoor units, the master/slave configuration of the product after

completion of indoor unit power ʻOFFʼ and then ʻONʼ the power after 1 minutes elapsed sign up.

- For ceiling type cassette and duct product group, change the

switch setting of the indoor PCB.

- For wall-mount type and stand type product, change the master/slave setting with the wireless remote controller. (Refer to

wireless remote controller manual for detail)

h When installing 2 remote controllers to one indoor unit with event communication function, set the master/slave of the

remote controller. (Refer to remote controller master/slave selection) When controlling the group, some functions excluding basic operation setting, fan level Min/Mid/Max, remote controller lock setting and time setting may be limited.

<When simultaneously connecting

2 sets of wired remote controller>

• When controlling in groups, set the master/slaver of the remote controller. Refer to Installer setting section on how to set master/slave for more detail.

12345678 12345678

#3 switch OFF: Master

(Factory default setting)

#3 switch ON: Slave

GND

12V

Signal wire

TEMP

FAN

SPEED

OPER

MODE

GND

12V

Signal wire

GND

12V

B Y R B Y R

MASTER SLAVE

Signal wire

GND

12V

Signal wire

TEMP

FAN SPEED

OPER MODE

TEMP

FAN SPEED

OPER MODE

GND

12V

B Y R B Y R

MASTER SLAVE

Signal wire

GND

12V

Signal wire

Part 2 Functions & Controls

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LGE Internal Use Only

6.8 Sleep Timer Operation

• When the sleep time is reached after <1,2,3,4,5,6,7,0(cancel) hr> is input by the remote control while in appliance operation, the operation of the appliance stops.

• While the appliance is on pause, the sleep timer mode cannot be input.

• While in cooling mode operation, 30 min later since the start of the sleep timer, the setting temperature increases by 1°C. After another 30 min elapse, it increases by 1°C again.

• When the sleep timer mode is input while in cooling cycle mode, the airflow speed of the indoor fan is set to the low.

• When the sleep timer mode is input while in heating cycle mode, the airflow speed of the indoor fan is set to the medium.

6.9 Timer(On/Off)

6.9.1 On-Timer Operation

• When the set time is reached after the time is input by the remote control, the appliance starts to operate.

• The timer LED is on when the on-timer is input. It is off when the time set by the timer is reached.

• If the appliance is operating at the time set by the timer, the operation continues. While in Fuzzy operation, the airflow speed of the indoor fan is automatically selected according to the temperature.

6.9.2 Off-Timer Operation

• When the set time is reached after the time is input by the remote control, the appliance stops operating.

• The timer LED is on when the off-timer is input. It is off when the time set by the timer is reached.

• If the appliance is on pause at the time set by the timer, the pause continues.