LG ARUN134DT2, ARUN076DT2, ARUN154DT2, ARUN173DT2, ARUN192DT2 Service Manual

System

Outdoor Unit

SERVICE MANUAL R410A

MODEL : ARUN Series

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

R410A

- 2 -

LGE Internal Use Only

Air Conditioner Service Manual

TABLE OF CONTENTS

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

Part 1 General Information.............................................................................................................10

Model Names .............................................................................................................................11

External Appearance .................................................................................................................12

Combination of Outdoor Units .................................................................................................14

Nomenclature .............................................................................................................................15

Outdoor Units Information ........................................................................................................16

Part 2 Outdoor Units ................................................................................................................

19

Part 3 PCB Setting and Test Run

........................................................................................57

Part 4 Trouble shooting guide .............................................................................................

69

- 3 -

LGE Internal Use Only

Safety Precautions

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

■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the following indications.

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

WARNING

CAUTION

This symbol indicates the possibility of death or serious injury.

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

Be sure not to do.

Be sure to follow the instruction.

WARNING

■ Installation

Have all electric work done by a licensed electrician according to "Electric Facility Engineering Standard" and "Interior Wire Regulations" and the instructions given in this manual and always use a special circuit.

• If the power source capacity is inadequate or electric work is performed improperly, electric shock or fire may result.

Ask the dealer or an authorized technician to install the air conditioner.

• Improper installation by the user may result in water leakage, electric shock, or fire.

Always ground the product.

• There is risk of fire or electric shock.

Always intstall a dedicated circuit and breaker.

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

- 4 -

LGE Internal Use Only

Safety Precautions

For re-installation of the installed product, always contact a dealer or an Authorized Service Center.

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

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

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

Do not store or use flammable gas or combustibles near the air conditioner.

• There is risk of fire or failure of product.

Use the correctly rated breaker or fuse.

• There is risk of fire or electric shock.

Prepare for strong wind or earthquake and install the unit at the specified place.

• Improper installation may cause the unit to topple and result in injury.

Do not install the product on a defective installation stand.

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

When installing and moving the air conditioner to another site, do not charge it with a different refrigerant from the refrigerant specified on the unit.

• If a different refrigerant or air is mixed with the original refrigerant, the refrigerant cycle may malfunction and the unit may be damaged.

Do not reconstruct to change the settings of the protection devices.

• If the pressure switch, thermal switch, or other protection device is shorted and operated forcibly, or parts other than those specified by LGE are used, fire or explosion may result.

Gasolin

R22

R407C

R410A

- 5 -

LGE Internal Use Only

■ Operation

Safety Precautions

Ventilate before operating air conditioner when gas leaked out.

• It may cause explosion, fire, and burn.

Securely install the cover of control box and the panel.

• If the cover and panel are not installed securely,

dust or water may enter the outdoor unit and fire or electric shock may result.

If the air conditioner is installed in a small room, measures must be taken to prevent the refrigerant concentration from exceeding the safety limit when the refrigerant leaks.

• Consult the dealer regarding the appropriate measures to prevent the safety limit from being exceeded. Should the refrigerant leak and cause the safety limit to be exceeded, harzards due to lack of oxygen in the room could result.

Do not damage or use an unspecified power cord.

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

Use a dedicated outlet for this appliance.

• There is risk of fire or electrical shock.

Be cautious that water could not enter the product.

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

Do not touch the power switch with wet hands.

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

- 6 -

LGE Internal Use Only

CAUTION

■ Installation

Safety Precautions

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

• There is risk of fire or electric shock.

Be cautious not to touch the sharp edges when installing.

• It may cause injury.

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

• This could result in personal injury and product damage.

Do not open the inlet 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.

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

• Low refrigerant levels may cause failure of product.

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.

Keep level even when installing the product.

• To avoid vibration or water leakage.

Do not install the unit where combustible gas may leak.

• If the gas leaks and accumulates around the unit, an explosion may result.

90˚

Gasolin

- 7 -

LGE Internal Use Only

Safety Precautions

Use power cables of sufficient current carrying capacity and rating.

• Cables that are too small may leak, generate heat, and cause a fire.

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.

Keep the unit away from children. The heat exchanger is very sharp.

• It can cause the injury, such as cutting the finger. Also the damaged fin may result in degradation of capacity.

When installting the unit in a hospital, communication station, or similar place, provide sufficient protection against noise.

•

The inverter equipment, private power generator, high-frequency medical equipment, or radio communication equipment may cause the air conditioner to operate erroneously, or fail to operate. On the other hand, the air conditioner may affect such equipment by creating noise that disturbs medical treatment or image broadcasting.

Do not install the product where it is 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.

- 8 -

LGE Internal Use Only

Safety Precautions

■ Operation

Do not use the air conditioner in special environments.

• Oil, steam, sulfuric smoke, etc. can significantly reduce the performance of the air conditioner or damage its parts.

Do not block the inlet or outlet.

• It may cause failure of appliance or accident.

Make the connections securely so that the outside force of the cable may not be applied to the terminals.

• Inadequate connection and fastening may generate heat and cause a fire.

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, or personal injury.

Install and insulate the drain hose to ensure that water is drained away properly based on the installation manual.

• A bad connection may cause water leakage.

Be very careful about product transportation.

• Only one person should not carry the product if it weighs more than 20 kg.

• Some products use PP bands for packaging. Do not use any PP bands for a means of transportation. It is dangerous.

• Do not touch the heat exchanger fins. Doing so may cut your fingers.

• When transporting the outdoor unit, suspending it at the specified positions on the unit base. Also support the outdoor unit at four points so that it cannot slip sideways.

- 9 -

LGE Internal Use Only

Safety Precautions

Safely dispose of the packing materials.

•

Packing materials, such as nails and other metal or wooden parts, may cause stabs or other injuries.

•

Tear apart and throw away plastic packaging bags so that children may not play with them. If children play with a plastic bag which was not torn apart, they face the risk of suffocation.

Turn on the power at least 6 hours before starting operation.

• Starting operation immediately after turning on the main power switch can result in severe damage to internal parts. Keep the power switch turned on during the operational season.

Do not touch any of the refrigerant piping during and after operation.

• It can cause a burn or frostbite.

Do not operate the air conditioner with the panels or guards removed.

• Rotating, hot, or high-voltage parts can cause injuries.

Do not directly turn off the main power switch after stopping operation.

• Wait at least 5 minutes before turning off the main power switch. Otherwise it may result in water leakage or other problems.

Auto-addressing should be done in condition of connecting the power of all indoor and outdoour units. Auto-addressing should also be done in case of changing the indoor unit PCB.

Use a firm stool or ladder when cleaning or maintaining the air conditioner.

• Be careful and avoid personal injury.

Do not insert hands or other objects through the air inlet or outlet while the air conditioner is plugged in.

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

- 10 -

LGE Internal Use Only

Part 1

General Information

1. Model Names ................................................................11

1.1 Indoor Unit .............................................................11

1.2 Outdoor Unit ..........................................................11

2. External Appearance.....................................................12

2.1 Indoor Unit .............................................................12

2.2 Outdoor Unit ..........................................................13

3. Combination of Outdoor Units .....................................15

4. Nomenclature.................................................................17

4.1 Indoor Unit .............................................................17

4.2 Outdoor Unit ..........................................................17

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LGE Internal Use Only

1. Model Names

1.1 Indoor Unit

Model Names

SE

Wall Mounted (General)

S5

SE

Mirror

S3

SF

1 Way TJ

2 Way TL

TE

4 Way

TP

TN

TM

BH

BG

High

Static

BR

B8

B1

Low Static

B2

B3

B4

Ceiling & Floor VE

Ceiling Suspended VJ

CE

With Case

CF

CE

CF

Capacity(MBh (kW))

Category

Chassis

Name

7 9 12 15 18 24 28 36 42 48 76 96

(2.2) (2.8) (3.6) (4.5) (5.6) (7.1) (8.2) (10.6) (12.3) (14.1) (22.4) (28)

Ceiling

Concealed

Duct

Built In

ART Cool

Gallery

Floor

Standing

Without

Case

Ceiling

Cassette

ART COOL

❈ *

ART COOL- B: Blue, M:Metal, D:Wood, R:Mirror, W:White Wood, V:Silver, E:Red, G:Gold, 1: Kiss (Photo changeable)

*Wall Mounted- A: Basic, L:Plasma, *Ceiling Cassette- A: Basic, C:Plasma

ARNU073

SE*2

ARNU093

SE*2

ARNU123

SE*2

ARNU153

SE*2

ARNU073

TJ*2

ARNU093

TJ*2

ARNU123

TJ*2

ARNU183

TL*2

ARNU243

TL*2

ARNU073

TE*2

ARNU093

TE*2

ARNU123

TE*2

ARNU153

TE*2

ARNU183

TE*2

ARNU243

TP*2

ARNU283

TP*2

ARNU073

BHA2

ARNU093

BHA2

ARNU123

BHA2

ARNU153

BHA2

ARNU183

BHA2

ARNU243

BHA2

ARNU073

B1G2

ARNU093

B1G2

ARNU123

B1G2

ARNU153

B1G2

ARNU073

B3G2

ARNU093

B3G2

ARNU123

B3G2

ARNU153

B3G2

ARNU073

CEA2

ARNU093

CEA2

ARNU123

CEA2

ARNU153

CEA2

ARNU073

CEU2

ARNU093

CEU2

ARNU123

CEU2

ARNU153

CEU2

ARNU093

VEA2

ARNU123

VEA2

ARNU183

VJA2

ARNU243

VJA2

ARNU183

CFA2

ARNU243

CFA2

ARNU183

CFU2

ARNU243

CFU2

ARNU283

BGA2

ARNU363

BGA2

ARNU423

BGA2

ARNU363

TN*2

ARNU483

BRA2

ARNU423

TM*2

ARNU483

TM*2

URNU76

3B8A2

URNU96

3B8A2

ARNU183

B2G2

ARNU243

B2G2

ARNU183

B4G2

ARNU243

B4G2

ARNU073

SE*2

ARNU093

SE*2

ARNU123

SE*2

ARNU153

SE*2

ARNU073

SF*2

ARNU093

SF*2

ARNU123

SF*2

ARNU183

S5*2

ARNU243

S5*2

ARNU183

S3*2

ARNU243

S3*2

- 12 -

LGE Internal Use Only

1.2 Outdoor Unit

Heat Pump ARUN

Power Supply

8HP 10HP 12HP 14HP 16HP 18HP 20HP 22HP 24HP

6.5ton 8.0ton 9.5ton 11.0ton 12.5ton 14.5ton 16.0ton 17.5ton 19.0ton

3Ø, 460V, 60Hz 076DT2 096DT2 115DT2 134DT2 154DT2 173DT2 192DT2 211DT2 230DT2

3Ø, 208/230V , 60Hz 076BT2 096BT2 115BT2 - 154BT2 173BT2 192BT2 211BT2 230BT2

Power Supply

26HP 28HP 30HP 32HP

20.5ton 22.5ton 24.0ton 25.5ton

3Ø, 460V, 60Hz 250DT2 270DT2 290DT2 310DT2

- 13 -

LGE Internal Use Only

External Appearance

2. External Appearance

2.1 Indoor Units

Wall Mounted

ART COOL Mirror

Ceiling Cassette- 1Way

Ceiling Cassette- 4Way

Ceiling & Floor

Ceiling Suspended

ARNU073TJ*2 ARNU093TJ*2 ARNU123TJ*2

Ceiling Cassette -2Way

ARNU183TL*2 ARNU243TL*2

ARNU073TE*2 ARNU093TE*2 ARNU123TE*2 ARNU153TE*2 ARNU183TE*2

ARNU243TP*2 ARNU283TP*2 ARNU363TN*2 ARNU423TM*2 ARNU483TM*2

Ceiling Concealed Duct - Low Static

ARNU073B1G2 ARNU093B1G2 ARNU123B1G2

ARNU153B1G2 ARNU183B2G2 ARNU243B2G2

ARNU073SE*2 ARNU093SE*2 ARNU123SE*2

ARNU153SE*2 ARNU183S5*2 ARNU243S5*2

ARNU073SE*2 ARNU093SE*2 ARNU123SE*2 ARNU153SE*2 ARNU183S3*2 ARNU243S3*2

ARNU093VEA2 ARNU123VEA2

ARNU183VJA2 ARNU243VJA2

Floor Standing With case

ARNU073CEA2 ARNU093CEA2 ARNU123CEA2 ARNU153CEA2 ARNU183CFA2 ARNU243CFA2

Without case

ARNU073CEU2 ARNU093CEU2 ARNU123CEU2 ARNU153CEU2 ARNU183CFU2 ARNU243CFU2

Ceiling Concealed Duct - High Static

ARNU073BHA2 ARNU093BHA2 ARNU123BHA2 ARNU153BHA2 ARNU183BHA2 ARNU243BHA2 ARNU283BGA2

ARNU363BGA2 ARNU423BGA2 ARNU483BRA2 URNU763B8A2 URNU963B8A2

Ceiling Concealed Duct – Built-in

ARNU073B3G2 ARNU093B3G2 ARNU123B3G2

ARNU153B3G2 ARNU183B4G2 ARNU243B4G2

* A:Basic, L:Plasma

ART COOL Gallery

ARNU073SF*2 ARNU093SF*2 ARNU123SF*2

* E:Red V:Silver G:Gold 1: Kiss (Photo changeable)

* A:Basic, C:Plasma

* A:Basic, C:Plasma * A:Basic, C:Plasma

S3: * B : Blue

M : Metal D : Wood R : Mirror W:White Wood

SE: * R:Mirror

V:Silver B : Blue

These are model names of the basic function.

- 14 -

LGE Internal Use Only

External Appearance

2.2 Outdoor Units(460V)

ARUN076DT2 ARUN096DT2 ARUN115DT2 ARUN134DT2 ARUN154DT2

ARUN173DT2 ARUN192DT2 ARUN211DT2 ARUN230DT2 ARUN250DT2 ARUN270DT2 ARUN290DT2 ARUN310DT2

- 15 -

LGE Internal Use Only

External Appearance

2.2 Outdoor Units(208/230V)

ARUN076BT2 ARUN096BT2 ARUN115BT2

ARUN154BT2 ARUN173BT2 ARUN192BT2 ARUN211BT2 ARUN230BT2

- 16 -

LGE Internal Use Only

Combination of Outdoor Units

3. Combination of Outdoor Units

3.1 460V

■ A maximum of 32HP can be obtained by combining 8, 10, 12, 14 and 16HP

System

Number of Units

Capacity 60Hz

Module

810121416

8HP(6.5ton) 1 1 - - - -

10HP(8.0ton) 1 - 1 - - -

12HP(9.5ton) 1 - - 1 - -

14HP(11.0ton) 1 - - - 1 -

16HP(12.5ton) 1 - - - - 1

18HP(14.5ton) 2 1 1 - - -

20HP(16.0ton) 2 1 - 1 - -

22HP(17.5ton) 2 1 - - 1 -

24HP(19.0ton) 2 1 - - - 1

26HP(20.5ton) 2 - - 1 1 -

28HP(22.5ton) 2 - - - 2 -

30HP(24.0ton) 2 - - - 1 1

32HP(25.5ton) 2 - - - - 2

System

Number of Units

Capacity 60Hz

Module

81012

8HP(6.5ton) 1 1 - -

10HP(8.0ton) 1 - 1 -

12HP(9.5ton) 1 - - 1

16HP(12.5ton) 2 2 - -

18HP(14.5ton) 2 1 1 -

20HP(16.0ton) 2 - 2 -

22HP(17.5ton) 2 - 1 1

24HP(19.0ton) 2 - - 2

3.2 208/230V

- 17 -

LGE Internal Use Only

Nomenclature

4. Nomenclature

4.1 Indoor Unit

4.2 Outdoor Unit

ARN U 307 ATJ 2

Generation

Chassis Name

Electrical Ratings 1:1Ø, 115V, 60Hz 2: 1Ø, 220V, 60Hz

6:1Ø, 220 ~ 240V, 50Hz 7: 1Ø, 100V, 50/60Hz 3:1Ø, 220 ~ 240V, 50Hz, 208/230V 60Hz

Total Cooling Capacity in Btu/h EX) 5,000 Btu/h➞'05' 18,000 Btu/h➞'18'

Combination of Inverter Type and Cooling Only or Heat Pump

N: AC Inverter and H/P V: AC Inverter and C/O U: DC Inverter and H/P and C/O

System with Indoor Unit using R410A

❈ LGETA:U Ex) URN

Combinations of functions A:Basic function L:Neo Plasma(Wall Mounted) C:Plasma(Ceiling Cassette) G: Low Static ART COOL Type Panel Color B:Blue D:Wood M:Metal R:Mirror W:White Wood V: Silver E:Red G:Gold 1: Kiss (Photo changeable)

ARU N D096 T2

Generation

Air Discharge Type S:Side Discharge T:Top Discharge

Electrical Ratings

8: 3Ø, 380 ~ 415V, 50Hz 9: 3Ø, 380V, 60Hz A: 3Ø, 220V, 50Hz B: 3Ø, 208/230V, 60Hz L: 3Ø, 380 ~ 415V, 50Hz / 3Ø, 380V, 60Hz D: 3Ø, 460V, 60Hz

Total Cooling Capacity in Btu/h EX) 76,000 Btu/h

➞ '076' 96,000 Btu/h ➞ '096'

Combination of Inverter Type and Cooling Only or Heat Pump N: Inverter and H/P V: Inverter and C/O B: Inverter and Heat Recovery

System with Outdoor Unit using R410A

- 18 -

LGE Internal Use Only

- 19 -

LGE Internal Use Only

Part 2

Outdoor Units

- 20 -

LGE Internal Use Only

• Function ........................................................................................21

• Replacement procedure for Compressor ..................................57

ARUN Series

- 21 -

LGE Internal Use Only

Function

1. Basic control ...................................................................................................................22

1.1 Normal operation .......................................................................................................22

1.2 Compressor control....................................................................................................22

1.3 Master and slave unit's EEV control...........................................................................23

2. Special control ................................................................................................................24

2.1 Oil return control ........................................................................................................24

2.2 Defrost control............................................................................................................26

2.3 Oil equalizing control..................................................................................................27

3. Protection control ...........................................................................................................28

3.1 Pressure protection control ........................................................................................28

3.2 Discharge temperature control...................................................................................29

3.3 Inverter protection control ..........................................................................................29

3.4 Liquid back control .....................................................................................................30

3.5 Phase detection .........................................................................................................30

3.6 Pressure switch..........................................................................................................30

4. Other control ...................................................................................................................31

4.1 Initial setup.................................................................................................................31

4.2 Instant indoor unit checking mode .............................................................................33

4.3 Emergency operation.................................................................................................34

4.4 Refrigerant Auto Charging .........................................................................................36

4.5 Refrigerant Checking Function...................................................................................38

4.6 Pump Down................................................................................................................40

4.7 Pump Out...................................................................................................................41

4.8 Auto Back Up Function_Inverter compressor ............................................................43

4.9 Auto Back Up Function_constant speed compressor ................................................44

4.10 Night Low Noise Function ........................................................................................45

4.11 Vacuum Mode ..........................................................................................................47

4.13 Black Box Function ..................................................................................................48

Function

- 22 -

LGE Internal Use Only

Note : Heating operation is not functional at an outdoor air temperature of 27°C(80°F) or more.

Cooling operation is not functional at an outdoor air temperature of 2°C(36°F) or less with indoor unit combination of 10% or less

1.2 Compressor control

Fuzzy control : Maintain evaporating temperature(Te) to be constant on cooling mode and condensing temperature(Tc) on heating mode by Fuzzy control to ensure the stable system performance. [Tc:47~51°C(117~124°F), Te:2~5°C(36~41°F)] (1) Cooling mode Te can be set by initial dip switch setting. (Normal mode, capacity up mode, and energy save mode)

(2) Heating mode Tc can be set by initial dip switch setting. (Normal mode, capacity up mode, and energy save mode)

Note: By setting dip switch, Te and Tc are decided simultaneously.

1.1 Normal operation

1. Basic control

Compressor

Fan

Main EEV

4 way valve

Subcooling

Indoor Unit

EEV

Fuzzy control

Full open

Off

Fuzzy control

Superheat fuzzy

control

• Normal : minimum pulse

• Avoiding control of high

discharge temperature

Subcooling fuzzy control

Fuzzy control

On

Cooling operation Heating operationActuator

stop

Before 15 min. : Max. pulse After 15 min. : Min. pulse

After 60 min. : Off

Before 15 min. : Max. pulse After 15 min. : Min. pulse

Before 10 min. : Min. pulse After 10 min. : Max. pulse

Stop state

Fuzzy Control

Stop(0Hz)

Min. frequency

Fuzzy control start

Target

Inverter linear control as cooling and heating load increasing

System Capacity

Cooling and heating load

Inverter

Comperssor

Inverter

Comperssor

Inverter

Comperssor

Inverter

Comperssor

Constant Speed

Compressor

B

Constant Speed

Compressor

B

Constant Speed

Compressor

B

Constant Speed

Compressor

A

Constant Speed

Compressor

C

Constant Speed

Compressor

A

(Linear Control)(Linear Control)(Linear Control)

Function

- 23 -

LGE Internal Use Only

1.3 Master and slave Unit's EEV control

(1) Main EEV control

Main EEV operates with fuzzy control rules to keep the degree of super Heat(Superheat) (about 3°C)at the evaporator outlet stable during heating mode The degree of Superheat = Tsuction - Tevaporation Tsuction : temperature at suction pipe sensor(°C/°F) Tevaporation : evaporation temperature equivalent to low pressure(°C/°F)

(2) Subcooling EEV control(about 15°C/58°F)

Subcooling EEV works with fuzzy rules to keep the degree of Subcool at the outlet of subcooler during cooling mode The degree of Subcool = Tcondensation - Tliquid Tliquid : temperature at outlet of subcooler(°C/°F) Tcondensation : condensation temperature equivalent to high pressure(°C/°F)

(3) Avoiding excessive high discharge temperature : when main EEV opens some given opening (R410A :

800 pls) and discharge temperature is above 85°C(185°F) in heating operation, subcooling EEV may control the "subcooling out temperature-evaporating temperature" to be some given difference.

Function

- 24 -

LGE Internal Use Only

2.1 Oil return control

2.1.1 Oil return control on cooling mode

Oil return operation recovers oil amount in compressor by collecting oil accumulated in pipe. Each cycle component operates as following table during oil return operation.

■ Oil return operation time : 3 min for running step

■ Starting condition:every 6 hours operate

■ Oil return process ends if compressor protection control starts

Normal control

OFF

100 pulse

Max. pulse

Normal control

OFF

40Hz

Ending

Normal control

OFF

Main. pluse

Max. pulse

Normal control

ON

Setting Value

Running

Normal control

OFF

Normal control

Max. pulse

Normal control

OFF

25Hz

Starting

Hot gas bypass valve

4way valve

Subcooling EEV

Main EEV

FAN

Constant Speed Compressor

Inv Compressor

Component

OFF

Min. pulse

Normal control

Ending

ON

1200 pulse

OFF

Running

OFF

Min. pulse

Normal control

Starting

Oil return signal

Thermo off unit EEV

Thermo on unit EEV

Fan

Component

Outdoor Unit

Indoor Unit

2. Special control

Function

- 25 -

LGE Internal Use Only

2.1.2 Oil return control on heating mode

■ Oil return operation time : 3 min for running step

■ Starting condition:same as cooling mode

■ Oil return process ends if compressor protection control starts

Outdoor Unit

Indoor Unit

OFF

Min. pulse

Normal control

Ending

ON

1200 pulse

OFF

Running

OFF

Min. pulse

Normal control

Starting

Hot gas bypass valve

4way valve

Subcooling EEV

Main EEV

FAN

Constant Speed Compressor

Inv Compressor

Component

Normal control

OFF

Normal control

Max. pulse

Normal control

OFF

25Hz

Starting

Normal control

ON

Min. pulse

Max. pulse

Normal control

ON

Setting Value

Running

Normal control

ON

100 pulse

Max. pulse

Normal control

OFF

25Hz

Ending

Oil return signal

Thermo off unit EEV

Thermo on unit EEV

Fan

Component

Function

- 26 -

LGE Internal Use Only

Outdoor Unit

Indoor Unit

Normal control

ON

Min. pulse

200 pulse

50Hz

OFF

25Hz

Ending

Normal control

OFF

Min. pulse

Max. pulse

High pressure control

ON

Setting Value

Running

Normal control

On → OFF

Min. pulse

Normal control

Stop

OFF

25Hz

Starting

Hot gas bypass valve

4way valve

Subcooling EEV

Main EEV

FAN

Constant Speed Compressor

Inv Compressor

Component

Min. pulse

Normal control

OFF

Ending

1200 pulse

OFF

Running

Min. pulse

Normal control

OFF

Starting

Thermo off unit EEV

Thermo on unit EEV

Fan

Component

Function

2.2 Defrost

Defrost operation eliminates ice attached on heat exchanger, recovering performance of heat exchanger. Each cycle component operates as following table during defrost operation.

■ Ending condition

1) All heat exchanger pipe temperature are above 15°C(58°F)(UY2) or 20°C(68°F)(UW1) for 30 sec.

2) The running time of defrost operation is over 30% of the total heating time

3) If compressor protection control starts by high discharge temperature of compressor etc.

- 27 -

LGE Internal Use Only

Function

2.3 Stopping operation

2.3.1 Stopping operation on cooling mode

2.3.2 Stopping operation on heating mode

After 15 min.

(Before 15 Min. : ON)

-

After 15 min.

(Before 15 min. : Min. pulse)

After 15 min.

(Before 15 min. : Min. pulse)

-

Note

OFF

Max. pulse

Stop

OFF

0Hz

Operation

Hot gas bypass valve

4way valve

Subcooling EEV

Main EEV

FAN

Constant Speed Compressor

Inv Compressor

Component

After 15 min.

(Before 15 Min. : ON)

After 60 min.

After 15 min.

(Before 15 min. : Min. pulse)

After 15 min.

(Before 15 min. : Min. pulse)

-

Note

OFF

Max. pulse

Stop

OFF

0Hz

Operation

Hot gas bypass valve

4way valve

Subcooling EEV

Main EEV

FAN

Constant Speed Compressor

Inv Compressor

Component

- 28 -

LGE Internal Use Only

3.1.2 Pressure control on heating mode

■ High pressure control

■ Low pressure control

❈ Frequency holding : frequency (or RPM) is not increasing ( can decrease )

Pressure Range Compressor Fan Hot_gas

Pd ≥ 4003 kPa (580.6 psi) Stop Stop On

Pd > 3676 kPa (533.2 psi)

-5Hz/4sec.1) -50RPM/4sec. On

P

d ≤ 3448 kPa (500.1 psi) Normal control Normal control

P

d ≤ Target press

Normal control

off

Pressure Range Compressor Fan Hot_gas

P

s ≤ 229 kPa (33.2 psi)

after 1min

Stop Stop

On

Ps ≤ 229 kPa (33.2 psi)

1min

-5Hz/4sec. +100RPM/4sec.

Ps ≤ 242 kPa (35.1 psi) Frequency holding Normal control

Ps ≤ 268 kPa (38.9 psi)

Normal control

Ps > 307 kPa (44.5 psi)

Off

2

1

3

Function

3.1 Pressure protection control

3.1.1 Pressure control on cooling mode

■ High pressure control

■ Low pressure control

❈ Frequency holding : frequency (or RPM) is not increasing ( can decrease )

3. Protection control

Pressure Range Compressor Fan Hot_gas

Pd ≥ 4003 kPa (580.6 psi)

Stop Stop

-

P

d > 3676 kPa (533.2 psi)

-5Hz/4sec. +100RPM/4sec.

Pd ≥ 3448 kPa (500.1 psi) Frequency holding Normal control

P

d < 3284 kPa (476.3 psi)

Normal control

-

Pressure Range Compressor Fan Hot_gas

P

s ≤ 229 kPa (33.2 psi)

after 1min

Stop Stop

On

P

s ≤ 229 kPa (33.2 psi)

1min

-5Hz/4sec. -100RPM/4sec.

P

s ≤ 242 kPa (35.1 psi)

Normal control Normal control

Ps ≥ 399 kPa (57.9 psi)

Normal control

Off

- 29 -

LGE Internal Use Only

Function

3.2 Discharge temperature control

■ Outdoor unit control

■ Indoor unit control

3.3 Inverter protection control

❈

AC input current is inverter input current except constant speed compressor current(Noise filter passed current)

Emergency

SH control

System stop

103°C(217°F) <

Tdis ≤ 112°C(234°F)

Tdis > 115°C(239°F)

Temperature range

EEV

Keep current control

98°C(208°F) < Tdis ≤ 103°C(217°F)

SH control

Tdis ≤ 98°C(208°F)

Frequency down +

const. Comp off

Liquid injection on

No frequency up

System stop

105°C(221°F) <

Tdis

≤ 112°C(234°F)

Tdis > 115°C(239°F)

Temperature range

Compressor

On

Liquid injection

Keep state

OFF

(below 20°C(212°F))

Pressure control

Tdis ≤ 98°C(208°F)

Off

Max. limit 490 pulse

Subcooling EEV

Max. limit 300 pulse

Pressure control

Tdis > 95°C(203°F)

Off

10 pulse open /10sec

30A or more28A or more28A or lessCompressor Current

20A or more18A or more18A or lessAC Input Current

System StopFrequency DownNormal Operation

98°C(208°F) <

Tdis

≤ 103°C(217°F)

- 30 -

LGE Internal Use Only

3.5 Phase detection

■ Main unit

If a phase is missed, 7-segment displays 50* on main PCB. If phases are reversed, 7-segment displays 54* on main PCB.

3.6 Pressure switch

- Main has pressure sensing switch in series between compressor and power relay.

- The state of pressure sensing switch is normally on. It has small electric current from 220V AC. Never touch the connecting terminal with hand nor short two wires directly.

3.4 Liquid back control

■ Cooling mode

■ Heating mode

❇ The logic starts after 9 min. on heating mode and 4 min. on cooling mode from the compressor running.

Tdis < Tc + 12°C(54°F)

Discharge temperature Indoor unit’s EEV

Normal SH control

Tdis > Tc + 16°C(60°F)

SH increasing control

Tdis < Tc + 17°C(62°F)

Discharge temperature Outdoor unit ’s EEV

Normal SH control

Tdis > Tc + 18°C(64°F)

Function

LG ARUN134DT2, ARUN076DT2, ARUN154DT2, ARUN173DT2, ARUN192DT2 Service Manual

Specifications and Main Features

Frequently Asked Questions

User Manual