LG Single "A" User manual

Single "A" Air Conditioner
SVC MANUAL(General)
MODEL : Single "A"-Inverter Type
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

- 1 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Air Conditioner Service Manual
CONTENTS
Part 1 General Information ..........................................................................................................2
1. Safety Precautions........................................................................................................3
2. Model Line up................................................................................................................6
3. Nomenclature ................................................................................................................8
Part 2 Functions & Controls......................................................................................................10
1. List of Functions & Controls......................................................................................11
2. Air flow.........................................................................................................................13
3. Air purifying.................................................................................................................15
4. Installation Functions.................................................................................................16
5. Reliability .....................................................................................................................19
6. Convenience Functions & Controls .........................................................................20
7. Special Function & KIT...............................................................................................31
8. Synchro Operation......................................................................................................48
Part 3 Control logic ....................................................................................................................51
1. Compressor.................................................................................................................52
2. Step(frequency) control..............................................................................................54
3. Reversing valve operaton ..........................................................................................57
4. Discharge pipe control ...............................................................................................58
5. Input Current Control..................................................................................................59
6. Outdoor Fan Control...................................................................................................60
7. Defrost Control............................................................................................................63
8. LEV Control .................................................................................................................64
9. Oil restoration operation ............................................................................................70
10. Compressor warm-up control logic ........................................................................70
11. Heat sink control.......................................................................................................71
Part 4 Test Run ..........................................................................................................................72
1. Check before Test Run ...............................................................................................73
2. Test Run Flow chart ....................................................................................................74
Part 5 Trouble Shooting Guide ................................................................................................77
1. Self-diagnosis Function .............................................................................................78
2. Pump Down .................................................................................................................80
3. Evacuation ...................................................................................................................81
4. Gas Charging...............................................................................................................82
5. Cycle Part.....................................................................................................................83
6. Electronic Parts...........................................................................................................84

- 2 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
1. Safety Precautions ............................................................................................................3
2. Model Line up .....................................................................................................................6
3. Nomenclature......................................................................................................................8
Part 1 General Information

Part 1 General Information
- 3 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes 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.
■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.
■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 disas-
sembling the equipment for a repair.Internal components and circuit boards are at
main potential when the equipment is connected to the power cables. This volt-
age is extremely dangerous and may cause death or severe injury if come in con-
tact 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 refriger-
ant 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
- 4 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes 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.

Part 1 General Information
- 5 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes 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 plat-
form 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 resis-
tance 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 user’s 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 prod-
uct 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

Part 1 General Information
- 6 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
2. Model line up
2.1 Indoor units
3.52
(12)
5.28
(18)
7.03
(24)
8.79
(30)
10.6
(36)
12.3
(42)
14.1
(48)
17.6
(60)
TE
ATNH126ELFC
[UT12 NEC]
AVNH126ELAC
[UV12 NEC]
AVNH186BLAC
[UV18 NBC]
AVNH246BLAD
[UV24 NBD]
AVNH306BLAD
[UV30 NBD]
ATNH186ELFC
[UT18 NEC]
ABNH186HLAC
[UB18 NHC]
ABNH246HLAD
[UB24 NHD]
ABNH306GLAD
[UB30 NGD]
ABNH366GLAD
[UB36 NGD]
ABNH426RLAD
[UB42 NRD]
ABNH486RLAD
[UB48 NRD]
ABNH606RLAD
[UB60 NRD]
AVNH366KLAD
[UV36 NKD]
AVNH426LLAD
[UV42 NLD]
AVNH486LLAD
[UV48 NLD]
AVNH606LLAD
[UV60 NLD]
ATNH24GPLED
[UT24NPD]
ATNH30GPLED
[UT30NPD]
ATNH36GNLED
[UT36NND]
ATNH42GMLED
[UT42NMD]
ATNH48GMLED
[UT48NMD]
ATNH60GMLED
[UT60NMD]
TN
TM
Category Type
Model Name
Capacity, kW(kBth/h)
Chassis
4way
Ceiling
cassette
TP
BH
BG
BR
VE
VB
VK
VL
Ceiling & floor
Ceiling suspended
Ceiling
c
oncealed
duct
High
static
pressure

Part 1 General Information
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Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
2.2 Outdoor units
DC Inverter
AUUW126C
[UU12W UEC]
AUUW186C
[UU18W UEC]
AUUW246D
[UU24W UED]
AUUW306D
[UU30W UED]
AUUW366D
[UU36W UED]
No. of connectable indoor units Max.1
Total capacity index of connectable kW 3.52 5.28 7.03 8.79 10.6
indoor units kBtu/h 12 18 24 30 36
Power supply 1Ø, 220-240V, 50Hz
Chassis
Inverter (1Ø)
DC Inverter
AUUW426D
[UU42W U3D]
AUUW486D
[UU48W U3D]
AUUW606D
[UU60W U3D]
No. of connectable indoor units Max.1
Total capacity index of connectable kW 12.5 14.0 15.0
indoor units kBtu/h 42 48 51
Power supply 1Ø, 220-240V, 50Hz
❈Synchro available
Chassis
3Phase Inverter
AUUW368D
[UU37W UED]
AUUW428D
[UU43W U3D]
AUUW488D
[UU49W U3D]
AUUW608D
[UU61W U3D]
No. of connectable indoor units Max.1
Total capacity index of connectable kW 10.6 12.5 14.0 15.0
indoor units kBtu/h 36 42 48 51
Power supply 3Ø, 380-415V, 50Hz
Chassis
Inverter (3Ø)
❈Synchro available

Part 1 General Information
- 8 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
3. Nomenclature
•Global Model Name
3.1 Indoor units
3.2 Decoration panel(For ceiling cassette models)
3.3 Outdoor units
A T NH 1 8 6 E L CA
Serial Number
Functions
A : Basic C : Plasma Air Purifier E: Elevation grille
Look : Basic
Chassis Name
Electrical Ratings
6:1
G: 1Ø220V~240V, 50/60Hz
Ø,220V-240V,50Hz 8:3 Ø,380V-415V,50Hz
Capacity code
Model Type
C: Cooling Only H: Heat Pump
R410A Universal Indoor Unit
ATN : Universal Ceiling Cassette Type Indoor Unit
ABN : Universal Ceiling Concealed Duct Type Indoor Unit
AVN : Universal Ceiling & Floor Type Indoor Unit
A U UH 1 8 6A
Serial Number
Electric Standard (Phase, Volts, Freq)
6:1 Ø,220V-240V,50Hz 8:3 Ø,380V-415V,50Hz
Capacity code
Model Type
C : Cooling Only H : Heat Pump W: Inverter Heat Pump
R410A Universal Outdoor Unit
PT- H E A
Functions
A: Basic C:For Indoor Unit with Plasma Air Purifier.
Indoor Unit Chassis
Model Type
C : Cooling Only H : Heat Pump U: Universal
Decoration Panel of Ceiling Cassette Type Indoor Unit

Part 1 General Information
- 9 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
•Europe Model Name
3.4 Indoor units
UT 24
Capacity code
Type
T : Cassette
B : Duct
V : Convertible
Model Type
U : Universal Model
Decoration panel
PT -HEC
Function Key
C: Plasma filter model, A: Basic model
Indoor unit chassis
Type of indoor unit
C: Cooling Only, H: Heat Pump U:Universal
PT: Decoration panel for Cassette model
3.5 Outdoor units
UU 24 W
Type of Air conditioner
W: Inverter
No mark for non-inverter
Capacity code
Type
U : Outdoor Units
Model Type
U : Universal Model

- 10 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Part 2 Functions & Controls
Part 2 Functions & Controls
1. List of Functions & Controls ...........................................................................................9
2. Air flow ............................................................................................................................11
2.1 Auto swing (left & right) ...............................................................................................11
2.2 Auto swing (up & down) ..............................................................................................11
2.3 Chaos swing (up/down)...............................................................................................11
2.4 Air flow step.................................................................................................................12
2.5 Chaos wind (auto wind)...............................................................................................12
2.6 Jet Cool Mode Operation ............................................................................................12
2.7 Swirl wind Swing .........................................................................................................12
3. Air purifying ....................................................................................................................13
3.1 PLASMA Air Purifying System ....................................................................................13
4. Installation Functions ....................................................................................................14
4.1 E.S.P. (External Static Pressure) Setting ....................................................................14
4.2 High Ceiling operation.................................................................................................16
5. Reliability ........................................................................................................................17
5.1 Hot start ......................................................................................................................17
5.2 Self-diagnosis Function...............................................................................................17
5.3 Soft dry operation........................................................................................................17
6. Convenience Functions & Controls .............................................................................20
6.1 Auto changeover operation ........................................................................................21
6.2 Child Lock Function.....................................................................................................24
6.3 Forced operation .........................................................................................................24
6.4 Group Control..............................................................................................................25
6.5 Sleep Timer Operation ................................................................................................27
6.6 Timer(On/Off) ..............................................................................................................27
6.7 Weekly Program..........................................................................................................27
6.8 Two Thermistor Control...............................................................................................28
6.9 Filter Sign clear ...........................................................................................................29
7. Special Function & KIT ..................................................................................................31
7.1 Wide Wired Remote controller(PQRCUSA0) installation guide ..................................31
Group control ..............................................................................................................31
Installer Setting-How to enter installer setting mode...................................................32
Installer Setting-Test Run mode .................................................................................34
Installer Setting-Setting Address of Central Control....................................................35
Installer Setting-E.S.P..................................................................................................36
Installer Setting-Thermistor.........................................................................................38
Installer Setting-Ceiling Height Selection ....................................................................39
Installer Setting-Static Pressure Setting......................................................................40
Installer Setting-Group Setting ....................................................................................41
Installer Setting-Mode Override Setting ......................................................................42
Installer Setting-Dry Contact Mode Setting.................................................................43
Installer Setting-Zone state setting..............................................................................44
Installer Setting-Option Function Setting.....................................................................45
7.2 Zone Controller ...........................................................................................................46
7.3 Auto Elevation Grille....................................................................................................47
8. Synchro operation..........................................................................................................48

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Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Part 2 Functions & Controls
1. List of Functions & Controls
Auto swing (left & right) Optional
Auto swing (up & down) Optional
Chaos swing (up & down) Optional
Airflow steps (fan/cool/heat)
Chaos wind (auto wind) Optional
Jet cool (Power wind)
Swirl wind Swing Optional
Deodorizing filter
Plasma air purifier Optional
Pre-filter
(washable/anti-fungus)
Drain pump Optional
E.S.P. control Optional
High ceiling operation Optional
Hot start
Self diagnosis
Soft dry operation
Auto changeover Optional
Auto clean Optional
Auto operation Optional
(artificial intelligence)
Auto restart operation
Child lock Optional
Forced operation
Group control Optional
Sleep mode
Timer (on/off)
Timer (weekly)
Two thermistor control Optional
Standard wired remote Optional
controller
Deluxe wired remote controller Optional
Simple wired remote controller Optional
Wired remote Controller Optional
(for hotel use)
Wireless remote controller Optional
(simple)
Wireless LCD remote control Optional
General central controller Optional
(Non LGAP)
Dry contact Optional
Category Function Description Remark
Horizontal Airflow Direction control
Vertical Airflow Direction control
Vertical Airflow Direction control
Indoor Fan speed Control
Indoor Fan speed Control by chaos pattern
Powerful cooling mode
Distribute & stir the Air inside.
Air filtration using Deodorizing filter
Air filtration using plasma filter
Air filtration using pre-filter
Drain water pump
Changeable External Static Pressure
Function to Control the Air Volume by Ceiling Height
To prevent cold wind blow on heating mode start
Error code displays
Dehumidification
Cooling mode is automatically changed to heating mode and
vice verse
After cooling operation, this function makes the
evaporator dry
Air volume & set temp. are automatically selected for comfort
on Cooling/Heating mode
When power returns after a power failure, unit restarts in the
previous operating mode
Protect the unit operation without approval
Operation without remote controller
Where several products are linked, one specific control
device can control a specific number of products.
Air volume & set temp. are automatically changed for com-
fortable sleep
Operation by Timer setting
Operation by weekly reservation
Option to control temperature by referring thermistor in the
Indoor unit or the LCD wired remote.
Standard wired remote controller
Deluxe wired remote controller
Simple wired remote controller
Wired remote controller (for hotel use)
Wireless remote controller (simple)
Wireless LCD remote control
General central controller
Dry contact
Airflow
Installation
Air purifying
Reliability
Convenience
Individual control
CAC network
function

- 12 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Part 2 Functions & Controls
Network Solution (LGAP) Optional
PDI
(Power Distribution Indicator) Optional
PI 485 Optional
Zone control Optional
Low ambient operation
Space Control Optional
Auto Elevation Optional
Outdoor Normal
Comp. control
EEV control
FAN control
Oil Return Control
Oil equalizing
Sump Heating
Protection Control
Inverter protection
Defrost / Deicing
High pressure switch Optional
Low pressure switch Optional
Phase protection Optional
Restart delay Optional
(3-minutes)
Self diagnosis
Soft start Optional
Test function
Category Function Description Remark
Network Solution (LGAP)
PDI (power distribution indicator)
Network control using PI 485 (Internet)
control the operation of the Air conditioning unit where each
zone
For operation at low temp.
Vanes angle can be controlled by pair.
Grille is automatically down to clean
Outdoor Control
Compressor Control
EEV Control
FAN control
Oil Return Control
Oil equalizing Control
Sump Heating Control
Protection Control
Inverter protection
Condenser frost prevention
Detect high pressure for safety
Detect low pressure for safety
Misconnection prevention for three phase
For overload prevention
Error code displays
Soft start for compressor
Test operation
CAC network
function
Special Function
& KIT
Other
Functions
& Controls
Notes: The Exploded View part has the particular Function table for each model.

- 13 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Part 2 Functions & Controls
2. Air flow
2.1 Auto swing (left & right)
RightLeft
110°~ 120°
Open
Close
110°~ 120°
Mode2
Mode3
Mode4
Mode5
Mode6
Mode7
Mode8
Mode9
OPEN
CLOSED
7~8°
110~120°
•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.
* Some Models are different with swing width and swing pattern.
NOTE: Some Models are different by swing width and swing pattern.

- 14 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Part 2 Functions & Controls
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 operat-
ed.
•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
3.1 PLASMA Air Purifying System
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
- 15 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
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
- 16 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
4.1 E.S.P. (External Static Pressure) Setting
4.1.1 Open the rear cover of the wired remote-controller to set the mode.
4.1.2 Select one of three selectable modes as follows.
■Without Zone System
1. Position V-H, F-H
•This position sets the maximum E.S.P. as a default set.
2. Position V-L
•This position sets the minimum E.S.P. as a default set.
■With Zone System
1. Position V-H
•Maximum E.S.P. setting & Fan speed is varied according to the state of dampers by micom.
2. Position F-H
•Maximum E.S.P. setting & Fan speed doesn't vary according to the opening & closing of dampers.
3. Position V-L
•Minimum E.S.P setting & Fan speed is varied according to the state of dampers by micom.
* Maximum : 8mmAq
Minimum : 0mmAq
4.1.3 Move the slide switch to set position.
4.1.4 Close the rear cover and check if it works normally.
4. Installation Functions
TH
R14H
SW TH
REMO
MAIN
2TH OP7
R18H
R17H
OP6
LO
STAND
SW HIGH
HI R03S
C070 R04S R02S
R01S
OP3 OP2 OP1
R19H
R11H
R13H R12H OP5R16H OP4
R15H
CO1H
V-H
V-L
F-H
Slide switch for ceiling height

Part 2 Functions & Controls
- 17 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
4.1.5 How to Set E.S.P?
Procedure of RPM change:
Ex) External Static pressure is 4mmAq for Model 36K.
•To protect the unit, compressor is designed to be off during E.S.P. setting.
Preheat
ZONE
Operation unit Program set
Room Temp
MED
LO
AUTO
JET
Heater
Defrost
Filter
Humidify
Out door
Set no. Time
01 03 05 07 09 11 13 15 17 19 21 23
OPERATION
FAN SPEED
SUB FUNCTION
SET TEMP
HI
AUTO SWING
Time
Preheat
ZONE
Operation unit Program set
Room Temp
MED
LO
AUTO
JET
Heater
Defrost
Filter
Humidify
Out door
Set no. Time
01 03 05 07 09 11 13 15 17 19 21 23
OPERATION
FAN SPEED
SUB FUNCTION
SET TEMP
HI
AUTO SWING
Time
Time
SUB FUNCTION
SET TEMP
OPERATIONAUTO SWING
Preheat
ZONE
Operation unit Program set
Room Temp
MED
LO
AUTO
JET
Heater
Defrost
Filter
Humidify
Out door
Set no. Time
01 03 05 07 09 11 13 15 17 19 21 23
FAN SPEED
HI
Time
SUB FUNCTION
SET TEMP
OPERATIONAUTO SWING
Preheat
ZONE
Operation unit Program set
Room T
MED
LO
AUTO
JET
Heater
Defrost
Filter
Humidify
Out door
Set no. Time
emp
01 03 05 07 09 11 13 15 17 19 21 23
FAN SPEED
HI
2
Timer
1
2
3
5
4
Timer
Push the"On/Off"button.
The unit will start.
Push the "Timer" and "Wind" button simultaneously for more then 3 seconds.
Push the "Up" of "Down" button for E.S.P adjustment.
And, adjust the number which you want.(In this example, the number is "225". Refer to the
PDB)
Shift the fan speed mode by pressing the fan speed button.
And then, Adjust numbers of next steps by repeating the stage 3.
(In this example, the numbers are "237" and "243" respectly)
Push the "Timer" and "Wind" button simultaneously for more than 3 seconds.
Then, Wind Data is memorized by the EEPROM of the main PCB.
Note: The range of selection is from 1~254. Since, the display is two Digit only.
If the range selection is above 100 then the third digit will appear in the screen as shown.

Part 2 Functions & Controls
- 18 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
4.2 High Ceiling operation
Function to Control the Air Volume by Ceiling Height Control of the air intensity has been made possible by employing a
height-control algorithm for the interior fan.
According to the height of the installation, it provides variability of indoor fan motor rpm. If the height of installation is low
then you can adjust low rpm of indoor fan motor. On the other hand if the height of the installation is high you can adjust
high rpm of indoor fan motor. Selection of speed can be done by slide switch at the back of the LCD wired remote.
Installation on the
normal-height ceiling
installation on the
higher ceiling
Elevation Choice Conditions of Release
Low
Standard
Hi
- When the elevation is low: lower than 2.4m in height.
- Operate the device at one level lower than the
standard level.
- When the elevation is standard: about 2.7m in
height.
- Operate the device at the standard air flow level.
- When the elevation is high: higher than 3.0m in
height.
- Operate the device at one level higher than the
standard level.

Part 2 Functions & Controls
- 19 -
Copyright ©2008 LG Electronics. Inc. All right reserved.
Only for training and service purposes 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 opera-
tion and 4-min compressor off repeat.
Compressor ON Temp. ➔Setting Temp+0.5°C
Compressor OFF Temp. ➔Setting Temp-0.5°C
•The indoor fan speed is automatically set to the low, so the shift of the indoor fan speed is impossible because of
already being set to the best speed for Dry Operation by Micom Control.
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°C18°C
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