LG Multi-Inverter Type User manual

Multi Air Conditioner
SVC MANUAL(General)
MODEL : Multi-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

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Copyright ©2010 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 ................................................................................................................7
Part 2 Functions & Controls ......................................................................................................8
1. List of Functions & Controls........................................................................................9
2. Air Flow .......................................................................................................................12
3. Air Purifying.................................................................................................................14
4. Installation Functions.................................................................................................15
5. Reliability .....................................................................................................................18
6. Convenience Functions & Controls .........................................................................19
Part 3 Control logic....................................................................................................................24
1. Compressor.................................................................................................................25
2. Step(frequency) control..............................................................................................26
3. Reversing valve operaton ..........................................................................................27
4. Discharge pipe control ...............................................................................................28
5. Input Current Control..................................................................................................29
6. Outdoor Fan Control...................................................................................................30
7. Defrost Control............................................................................................................31
8. LEV Control .................................................................................................................32
9. Oil restoration operation ............................................................................................34
10. Compressor warm-up control logic ........................................................................34
11. Heat sink control .......................................................................................................35
Part 4 Test Run..........................................................................................................................36
1. Check before Test Run ..............................................................................................37
2. Test Run Flow chart ...................................................................................................38
3. Test Runing..................................................................................................................39
Part 5 Trouble Shooting Guide ...............................................................................................40
1. Self-diagnosis Function ......................................................................................41
2. Pump Down ..........................................................................................................43
3. Evacuation............................................................................................................44
4. Gas Charging .......................................................................................................45
5. Cycle Part .............................................................................................................46
6. Electronic Parts....................................................................................................47

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Copyright ©2010 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......................................................................................................................7
Part 1 General Information

Part 1 General Information
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Copyright ©2010 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
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Copyright ©2010 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
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Copyright ©2010 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 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 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

2. Model Line Up
Part 1 General Information
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Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
2.1 Indoor units
2.64
(9)
5.28
(18)
3.52
(12)
ART COOL
Category Type
LIBERO
Model names
Capacity, kW(kBtu/h Class)
Chassis
Wall
mounted
Ceiling cassette
SB
SC
SE
S8
TR
TQ
AMNW09GDBL0
[LMAN096HV]
AMNW12GDBL0
[LMAN126HV]
AMNW18GDCL0
[LMAN186HV]
AMNW09GDER1
[LMAN095HVT]
AMNW12GDER1
[LMAN125HVT]
AMNW09GB1A0
[LMDN095HV]
AMNW12GB1A0
[LMDN125HV]
AMNW12GTRA0
[LMCN125HV]
AMNW18GD8R1
[LMAN185HVT]
AMNW18GTQA0
[LMCN185HV]
AMNW18GB2A0
[LMDN185HV]
B1
B2
Low
static
pressure
(Slim)
Ceiling
concealed
duct
2.2 Outdoor units
Heat pump
A2UW183FA2
[LMU187HV]
A3UW243FA2
[LMU247HV]
A4UW363FA1
[LMU366HV]
A4UW363FA2
[LMU369HV]
No. of connectable indoor units Max.2 Max.3 Max.4 Max.4
Total capacity index of connectable
indoor units 24 33 48 48
Power supply 1Ø, 208~230V, 60Hz
Chassis

Part 1 General Information
3. Nomenclature
3.1 Indoor Unit(Global)
3.2 Outdoor Unit(Global)
AMN W G
09 EDL0
Serial number
A2U W 318 F A 0
Electrical rating
Indicates that this is multi system indoor unit using R410A
Model type
H : Heat pump
W : DC Inverter heat pump
Ex) 7,000 Btu/h Class → '07', 18,000 Btu/h Class → '18'
Cooling/heating capacity
Electrical rating
G: 1ø, 208-230V, 50Hz/60Hz
Chassis name
Indoor unit type
L : Wall Mounted, D : ART COOL Mirror
T : Ceiling cassette, B : Ceiling concealed duct
Function
A : Basic, L : Nano plasma (Wall Mounted)
C: Plasma(ceiling cassette), G: Low static motor
ART COOL(Mirror) type front panel color
R : Mirror, W : White, G : Gold
Indicates that this is multi system outdoor unit using R410A
Ex) A2U : Connectable max. 2 indoor units
A4U : Connectable max. 4 indoor units
Model type
W : DC inverter heat pump
Ex) 24,000 Btu/h Class → '24', 36,000 Btu/h Class →'36'
Cooling/heating capacity
3 : 1ø, 208-230V, 60Hz
Multi type
Function
A : Basic
F : Free joint multi type
Serial number
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Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only

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Copyright ©2010 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 ..........................................................................................9
2. Air flow ............................................................................................................................12
2.1 Auto swing (left & right)...............................................................................................12
2.2 Auto swing (up & down) ..............................................................................................12
2.3 Chaos swing (up/down)...............................................................................................12
2.4 Air flow step.................................................................................................................13
2.5 Chaos wind (auto wind)...............................................................................................13
2.6 Jet Cool Mode Operation ............................................................................................13
2.7 Swirl wind Swing .........................................................................................................13
3. Air purifying ....................................................................................................................14
3.1 PLASMA Air Purifying System ....................................................................................14
4. Installation Functions ....................................................................................................15
4.1 E.S.P. (External Static Pressure) Setting ....................................................................15
4.2 How to Set E.S.P? ......................................................................................................16
4.3 High Ceiling operation.................................................................................................17
5. Reliability ........................................................................................................................18
5.1 Hot start.......................................................................................................................18
5.2 Self-diagnosis Function...............................................................................................18
5.3 Soft dry operation........................................................................................................18
6. Convenience Functions & Controls .............................................................................19
6.1 Auto cleaning operation ..............................................................................................19
6.2 Auto Operation (Fuzzy Operation) ..............................................................................20
6.3 Auto restart Opeartion.................................................................................................21
6.4 Child Lock Function.....................................................................................................22
6.5 Forced operation.........................................................................................................22
6.6 Sleep Timer Operation ................................................................................................23
6.7 Timer(On/Off) ..............................................................................................................23
6.8 Defrost Control (Heating) ............................................................................................23

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Copyright ©2010 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
1.1 Description 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
Electric heater (operation) 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
Electric heater
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

Network Solution (LGAP) Optional
PDI
(Power Distribution Indicator) Optional
PI 485 Optional
Zone control Optional
Low ambient operation
Space Control Optional
Auto Elevation Optional
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
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
Functions for
outdoor
Notes: The Exploded View part has the particular Function table for each model.
Part 2 Functions & Controls
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Only for training and service purposes LGE Internal Use Only

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Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Part 2 Functions & Controls
* Some of functions are slightly different depending upon models, refer individual function table on "PART 2. indoor units".
** For ceiling concealed duct models, auto-run function of dry contact is not applicable.
O : Applied X : Not applied – : No relation
Option : Model name & price are different according to options, and assembled in factory with main unit.
Accessory :
Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package.
1.2 List of functions
Function Category Wall Mounted
(LIBERO)
ART COOL
Mirror
Ceiling Cassette
4-way
Ceiling
Concealed Duct
(Low static)
Air supply outlet 1 1 4 1
Airflow direction control(left & right) Auto Auto X -
Airflow direction control(up & down) Auto Auto Auto -
Auto swing(left & right) O O X -
Auto swing(up & down) O × O -
Airflow steps(fan/cool/heat) 5/6/6 3/4/3 4 / 5 / 4 3 / 3 / 3
Chaos swing X O X -
Chaos wind(auto wind) O X O X
Jet cool/heat(Power wind) O/O O/X O/X O/X
Swirl wind X X O X
Deodorizing filter O O X X
Allergy free filter O X X X
Plasma air purifier O O Option X
Prefilter(washable / anti-fungus) O O O O
Drain pump - - O O
E.S.P. control - - - O
Electric heater(operation) - - X X
High ceiling operation - - O -
Hot start O O O O
Self diagnosis O O O O
Soft dry operation O O O O
Auto changeover X X X X
Auto cleaning O O X X
Auto operation(artificial intelligence) O O O O
Auto restart operation O O O O
Child lock O - O O
Energy-Saving Cooling Mode O X X X
Forced operation O O O X
Group control - - O O
Sleep mode O O O X
Timer(on/off) O O O X
Timer(weekly) O - O X
Two thermistor control O - O O
Wide wired remote controller Accessory Accessory Accessory Accessory
Deluxe wired remote controller X X X X
Simple wired remote controller Accessory Accessory Accessory O
Simple wired remote controller(for hotel use) Accessory Accessory Accessory Accessory
Wireless remote controller(simple) X X X X
Wireless LCD remote control X X X X
Wireless LCD remote control(Ez) O O O Accessory
General central controller (Non LGAP) X X X X
Dry contact Accessory Accessory Accessory Accessory
Dry contact(temperature setting) Accessory Accessory Accessory Accessory
Central control(LGAP) O O O O
PDI(power distribution indicator) Accessory Accessory Accessory Accessory
PI 485 Accessory Accessory Accessory Accessory
CTIE X X - X
Zone control X X - X
Thermistor - - - -
Air flow
Air purifying
Installation
Reliability
Convenience
Individual
control
Special
function kit
Others
CAC network
function

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

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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

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Copyright ©2010 LG Electronics. Inc. All right reserved.
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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
Ionizer Photo-Catalyst Coated Mesh
Dust particles
Odour
Dust electrode discharge
Odour molecule
Generating plasma
+
+
+
+
Polluted Air Purified fresh Air
+4.8KV discharge
+

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Copyright ©2010 LG Electronics. Inc. All right reserved.
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Part 2 Functions & Controls
4.1 External pressure setting for
4. Installation Functions
(E.S.P. Control) provide required constant air flow rate irrespective of E.S.P. charge.
(1) Open the rear cover of the wired remote-controller to set the mode.
(2) Select one of three selectable modes as follows.
Group control switch
1. For individual control/Master use
2. For group control/Slave use
Ceiling height selection switch
1. Position V-L:
• Minimum 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-H:
• Maximum E.S.P. setting & Fan speed is varied according
to the state of dampers by micom.
Product selection switch
1. Cooling Only product
2. Heat Pump product
Indoor temperature sensor selection switch
1. Use the temperature sensor on the remote controller.
2. Use the temperature sensor on the product.
3. Use the sensors on the product and remote controller.
• When changing the product selection switch and group control switch, the power must be reconnected to reflect the changes.
• The central control could operate inappropriately depends on indoor unit type, when the remote controller is set as slave.
S/W 1
SW±GR
SW±HI
Room Temp. Sensing
Ceiling Height/Default E.S.P
Group Control
3
1
2
2
SW±PD
SW±TH
Select Product
2
1
1
321

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Copyright ©2010 LG Electronics. Inc. All right reserved.
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Part 2 Functions & Controls
4.2 How to Set E.S.P?
Out door
Room Temp
Total on
Central Run
Defrost Preheat
PQRCUCS0C
FAN
SPEED
MODE
Lo
Med
100
Setting the Low wind to 210 Setting the Medium wind to 175
TEMP
TEMP
This Function can be controled with new wired remote controller
Procedure of RPM change:
Ex) External static pressure is 29Pa for model name "AMNW12GB1A0[LMDN125HV]".
• To protect the unit, compressor is designed to be off during E.S.P. setting.
• E.S.P function is setting the volume of each fan speed.
It is for the convenience of installation.
It is recommended that you should not use this function while using the remote controller.
1
Press the mode button and the temperature increasing
button(▲) same time for three seconds.
2
Set the volume of each fan speed(Low, Medium, Hi)
by using the temperature control button. Press the fan
speed button to select the fan speed.
The value of E.S.P can be adjusted from 1 to 255.
3
If you press the On/Off button while setting the ESP
function, it will be canceled. (The picture on the left
side is the example of setting the Hi wind to ESP 09.)
4
Press the mode button and the temperature increasing
button (s) same time for three seconds. Then the ESP
setting will be activated after the temperature display
flashes three times.
❈The E.S.P value is set at the proper value at the factory.
So it is highly recommended that you should not change
the E.S.P value at your discretion.

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Copyright ©2010 LG Electronics. Inc. All right reserved.
Only for training and service purposes LGE Internal Use Only
Part 2 Functions & Controls
[ 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.
Static pressure(mmAq)
Setting value
01234
Model name Step(Hi/Mid/Lo)
8.5 CMM(300CFM) 75 84 94 104 114
7.5 CMM(265CFM) 69 77 88 99 110
6.5 CMM(230CFM) 62 71 83 95 106
9.5 CMM(335CFM) 82 90 99 109 118
8.5 CMM(300CFM) 75 84 94 104 114
7.5 CMM(265CFM) 69 77 88 99 110
15 CMM(530CFM) 90 97 105 114 122
13.5 CMM(477CFM) 82 90 99 109 119
11.5 CMM(406CFM) 75 84 93 103 114
AMNW09GB1A0
[LMDN095HV]
AMNW12GB1A0
[LMDN125HV]
AMNW18GB2A0
[LMDN185HV]
E.S.P. setting value (reference)
4.3 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

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Copyright ©2010 LG Electronics. Inc. All right reserved.
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Part 2 Functions & Controls
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+1
°F( 0.5°C)
Compressor OFF Temp. ➔Setting Temp-1
°F( 0.5°C)
• In 10-min dehumidification operation, the indoor fan operates with the low airflow speed.
5. Reliability
Intake air Temp. Setting Temp.
78°F(26°C) ≤ intake air temp. 77°F(25°C)
76°F(24°C) ≤ intake air temp.< 78°F(26°C) intake air temp. -2°F(-1°C)
72°F(22°C) ≤ intake air temp. < 76°F(24°C) intake air temp. 1°F(-0.5°C)
64°F(18°C) ≤ intake air temp. < 72°F(22°C) intake air temp.
intake air temp. < 64°F(18°C) 64°F(18°C)

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Part 2 Functions & Controls
6. Convenience Functions & Controls
6.1 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 opera-
tion.
• The function is easy to operate as it is accessed through the Remote controller.
Unit
Operation
13~14 minutes 1 minute 2~3 minutes
ON
OFF
Comp.
Indoor
Fan
ON
OFF
ON
OFF
Setting step OFFL Low
Setting step
Unit
Operation
ON
OFF
Comp.
Indoor
Fan
ON
OFF
ON
OFF
Setting step OFFL Low
Setting step
(Heat Pump)
(Cooling Only)