LG FM21AH UE3, FM30AH UE3, FM25AH UE3, FM27AH UE3, FM38AH UH3 Svc 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

- 1 -

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 ..............................................................................................................11

Part 2 Functions & Controls.....................................................................................................13

1. List of Functions & Controls......................................................................................14

2. Air Flow .......................................................................................................................16

3. Air Purifying.................................................................................................................18

4. Installation Functions.................................................................................................19

5. Reliability .....................................................................................................................23

6. Convenience Functions & Controls .........................................................................24

7. Special Function & KIT...............................................................................................36

Part 3 Control logic....................................................................................................................39

1. Compressor.................................................................................................................40

2. Step(frequency) control..............................................................................................42

3. Reversing valve operaton ..........................................................................................43

4. Discharge pipe control ...............................................................................................44

5. Input Current Control..................................................................................................45

6. Outdoor Fan Control...................................................................................................46

7. Defrost Control............................................................................................................47

8. LEV Control .................................................................................................................48

9. Oil restoration operation ............................................................................................50

10. Compressor warm-up control logic ........................................................................50

11. Heat sink control.......................................................................................................51

Part 4 Test Run..........................................................................................................................52

1. Check before Test Run ..............................................................................................53

2. Test Run Flow chart ...................................................................................................54

3. Test Runing..................................................................................................................55

Part 5 Trouble Shooting Guide ...............................................................................................58

1. Self-diagnosis Function ......................................................................................59

2. Pump Down ..........................................................................................................63

3. Evacuation............................................................................................................64

4. Gas Charging .......................................................................................................65

5. Cycle Part .............................................................................................................66

6. Electronic Parts....................................................................................................67

- 2 -

LGE Internal Use Only

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

2. Model Line Up .....................................................................................................................6

3. Nomenclature....................................................................................................................11

Part 1 General Information

- 3 -

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

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

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

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

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

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

Part 1 General Information

- 4 -

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 -

LGE Internal Use Only

1.2 Inspections after Repair

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

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

Be sure to check the earth wire is correctly connected.

After the work has finished, be sure to do an insulation tset to check the resistance is 2[Mohm] or more between the charge section and the non-charge metal section (Earth position). If the resistance value is low, a disaster such as a leak or electric shock is caused at 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 product is operating. There are sharp and moving parts that could cause personal injury.

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

2. Model Line Up

Part 1 General Information

- 6 -

LGE Internal Use Only

2.1 Indoor units

2.05 (7)

2.64 (9)

3.52 (12)

5.28 (18)

7.03 (24)

ART COOL

SP1

SF

AMNH096AP*1

[MA09AH* NP1]

AMNH09GAF*1 [MA09AH* NF1]

AMNH12GAF*1 [MA12AH* NF1]

AMNH126AP*1

[MA12AH* NP1]

SZ

SU

S3

1-way

TE1

AMNH09GTEF0

[MT10AH NE1]

AMNH12GTEF0

[MT12AH NE1]

AMNH18GTEF0

[MT18AH NE1]

Category Type

Model names

Capacity, kW(kBtu/h)

Chassis

Wall mounted

ART COOL

Mirror

4-way

Ceiling

cassette

S4

AMNH07GD4L0

[MS07AH N40]

AMNH12GD4L0

[MS12AH N40]

S5

AMNH18GD5L0

[MS18AH N50]

AMNH24GD5L0

[MS24AH N50]

AMNH07GDZ*0 [MC07AH* NZ1]

AMNH12GDU*0 [MC12AH* NU1]

AMNH18GD3*0 [MC18AH* N31]

AMNH24GD3*0 [MC24AH* N31]

SE

S8

AMNH09GDE*1 [MC09AH* NE1]

AMNH18GD8*1 [MC18AH* N81]

AMNH24GD8*1 [MC24AH* N81]

AMNH07GDE*1 [MC07AH* NE1]

AMNH12GDE*1

[MC12AH* NE1]

TC1

AMNH09GTCC0

[MT09AH NC1]

AMNH12GTCC0

[MT11AH NC1]

TH

AMNH24GTHF0

[MT24AH NH0]

AMNH09GDU*0

[MC09AH* NU1]

AMNH09GD4L0

[MS09AH N40]

* indicates color of panel(B:Blue, C:Cherry, D:Wood, M:Metal, R:Mirror, V:Silver, W:White wood, E:Red, G:Gold,

H:White Silver, 1:KISS)

Part 1 General Information

- 7 -

LGE Internal Use Only

B1

AMNH09GB1A0/1 [MB09AHL N10/1]

AMNH12GB1A0/1 [MB12AHL N10/1]

B2

AMNH18GB2A0/1 [MB18AHL N20/1]

AMNH24GB2A0/1 [MB24AHL N20/1]

Low

static

pressure

(Slim)

Category Type

Model names

Capacity, kW(kBtu/h)

Chassis

2.05 (7)

2.64 (9)

3.52 (12)

5.28 (18)

7.03 (24)

BH

AMNH186BHA0

[MB18AH NH0]

AMNH246BHA0

[MB24AH NH0]

Low

static

pressure

BT

AMNH096BTG0 [MB09AHL NT0]

AMNH126BTG0

[MB12AHL NT0]

AMNH186BTG0 [MB18AHL NT0]

Built in

BP

AMNH096BPA0

[MB09AHB NP0]

AMNH126BPA0

[MB12AHB NP0]

VE

AMNH096VEA0

[MV09AH NE0]

AMNH126VEA0

[MV12AH NE0]

VB

AMNH186VBA0

[MV18AH NB0]

AMNH246VBA0

[MV24AH NB0]

High

static

pressure

Ceiling & floor

Ceiling

concealed

duct

Part 1 General Information

- 8 -

LGE Internal Use Only

Heat pump

A2UW146FA3

[FM15AH UL3]

A2UW166FA0

[FM17AH UL0]

A2UW166FA1

[FM17AH UL1]

A3UW186FA0

[FM19AH UE0]

No. of connectable indoor units Max.2 Max.3 Total capacity index of connectable kW 6.15 7.03 8.79 indoor units kBtu/h 21 24 30 Power supply 1ø, 220-240V, 50Hz

Chassis

2.2 Outdoor units

Heat pump

A3UW216FA3 [FM21AH UE3] A4UW246FA3 [FM25AH UE3] A4UW276FA3 [FM27AH UE3]

No. of connectable indoor units Max.3 Max.4 Total capacity index of connectable kW 9.67 11.4 12.0 indoor units kBtu/h 33 39 41 Power supply 1ø, 220-240V, 50Hz

Chassis

Heat pump

A5UW306FA3 [FM30AH UE3] A5UW406FA3 [FM38AH UH3]

No. of connectable indoor units Max.5 Total capacity index of connectable kW 14.1 15.2 indoor units kBtu/h 48 52 Power supply 1ø, 220-240V, 50Hz

Chassis

Part 1 General Information

- 9 -

LGE Internal Use Only

Heat Pump

A6UW368FA0[FM37AH UE0] A7UW428FA3[FM41AH U33] A8UW488FA3[FM49AH U33]

No. of connectable indoor units Max.6 Max.7 Max.8 Number of BD units to be connected Max.2 Total capacity index of connectable kW 13.5 15.8 18.2 indoor units kBtu/h 46 54 62 Power supply 3ø, 380-415V, 50Hz

Chassis

Heat Pump

A9UW548FA3[FM57AH U33]

No. of connectable indoor units Max.9 Number of BD units to be connected Max.3 Total capacity index of connectable kW 21.4 indoor units kBtu/h 73 Power supply 3ø, 380-415V, 50Hz

Chassis

(3 phase)

Heat Pump

A7UW406FA3

[FM40AH UH3]

A8UW486FA3 [FM48AH U33]

A9UW566FA3 [FM56AH U33]

No. of connectable indoor units Max.7 Max.8 Max.9 Number of BD units to be connected Max.2 Total capacity index of connectable kW 15.2 18.2 21.4 indoor units kBtu/h 52 62 73 Power supply 1ø, 220-240V, 50Hz

Chassis

(1 phase)

Part 1 General Information

- 10 -

LGE Internal Use Only

No. of connectable indoor units

Max. 2 Max. 3 Max. 4

Model name PMBD3620 PMBD7220 PMBD3630 PMBD7230 PMBD3640 Connectable indoor unit capacity kW 2.05~7.03 5.28~10.6 2.05~7.03 5.28~10.6 2.05~7.03

kBtu/h 7~24 18~36 7~24 18~36 7~24

BD unit

2.3 BD(Branch distributor) units

Part 1 General Information

3. Nomenclature

3.1 Indoor Unit(Global)

3.2 Outdoor Unit(Global)

AMN H G

07

4DL0

Serial number

A4U W 624 F A 3

Electrical rating

Indicates that this is multi system indoor unit using R410A

Model type

H : Heat pump

Ex) 7,000 Btu/h → '07', 18,000 Btu/h → '18'

Cooling/heating capacity

Electrical rating

6 : 1ø, 220-240V, 50Hz G: 1ø, 220-240V, 50Hz/60Hz

Chassis name

Indoor unit type

L : Wall Mounted , A : ART COOL D : ART COOL Mirror, T : Ceiling cassette B : Ceiling concealed duct V : Ceiling & floor

Function

A : Basic, L : Nano plasma (Wall Mounted) C: Plasma(ceiling cassette), G: Low static motor

ART COOL(Mirror) type front panel color

B : Blue, C : Cherry, D : Wood, M : Metal, R : Mirror, V : Silver, W : White wood, E : Red, G : Gold, H:White Silver, 1 : KISS

Indicates that this is multi system outdoor unit using R410A

Ex) A4U : Connectable max. 4 indoor units A6U : Connectable max. 6 indoor units

Model type

W : DC inverter heat pump

Ex) 24,000 Btu/h → '24', 48,000 Btu/h → '48'

Cooling/heating capacity

6 : 1ø, 220-240V, 50Hz 8 : 3ø, 380-415V, 50Hz

Multi type

Function

A : Basic

F : Free joint multi type

Serial number

- 11 -

LGE Internal Use Only

- 12 -

LGE Internal Use Only

Part 1 General Information

3.3 Indoor Unit(Europe)

3.5 BD Unit(Global)

MC12AHB

Color of front panel (MA-, MC- model) B : Blue, C : Cherry, D : Wood, M : Metal, R : Mirror, V : Silver, W : White wood

Type of duct indoor (MB- model) No mark : High static pressure model L : Low static pressure model B : Builti in model

Model type C : Cooling only, H : Heat pump

Type of refrigerant A : R410A

Cooling/heating capacity Ex) 7,000 Btu/h → '07', 18,000 Btu/h → '18'

Type of indoor units S : Wall mounted, A : ART COOL, C : ART COOL Mirror B : Ceiling concealed duct T : Ceiling cassette, V : Ceiling & Floor

Model type M : Multi type air conditioner

FM

19 A H

Model Ttype C : Cooling only, H : Heat pump

Type of refrigerant A : R410A

Cooling/heating capacity Ex) 18,000 Btu/h → '18', 48,000 Btu/h → '48'

Model type FM : Free joint type MPS inverter multi ( , )

P M BD 36 2 0

Serial number

Number of connectable indoor units

Max. capacity of connectable indoor units Ex) 36,000 Btu/h → '36', 72,000 Btu/h → '72'

BD : Branch distributor

M : Multi system outdoor unit

P : Parts

3.4 Outdoor Unit(Europe)

- 13 -

LGE Internal Use Only

Part 2 Functions & Controls

1. List of Functions & Controls ........................................................................................14

2. Air flow ............................................................................................................................16

2.1 Auto swing (left & right) ...............................................................................................16

2.2 Auto swing (up & down) ..............................................................................................16

2.3 Chaos swing (up/down)...............................................................................................16

2.4 Air flow step.................................................................................................................17

2.5 Chaos wind (auto wind)...............................................................................................17

2.6 Jet Cool Mode Operation ............................................................................................17

2.7 Swirl wind Swing .........................................................................................................17

3. Air purifying ....................................................................................................................18

3.1 PLASMA Air Purifying System ....................................................................................18

4. Installation Functions ....................................................................................................19

4.1 E.S.P. (External Static Pressure) Setting ....................................................................19

4.2 High Ceiling operation.................................................................................................22

5. Reliability ........................................................................................................................23

5.1 Hot start ......................................................................................................................23

5.2 Self-diagnosis Function...............................................................................................23

5.3 Soft dry operation........................................................................................................23

6. Convenience Functions & Controls .............................................................................24

6.1 Auto changeover operation ........................................................................................24

6.2 Auto cleaning operation ..............................................................................................28

6.3 Auto Operation (Fuzzy Operation) ..............................................................................29

6.4 Auto restart Opeartion.................................................................................................30

6.5 Child Lock Function.....................................................................................................31

6.6 Forced operation .........................................................................................................31

6.7 Group Control..............................................................................................................32

6.8 Sleep Timer Operation ................................................................................................34

6.9 Timer(On/Off) ..............................................................................................................34

6.10 Weekly Program........................................................................................................34

6.11 Two Thermistor Control .............................................................................................35

7. Special Function & KIT ..................................................................................................36

7.1 Zone Controller ...........................................................................................................36

7.2 Low Ambient control....................................................................................................36

7.3 Space Control .............................................................................................................37

7.4 Auto Elevation Grille....................................................................................................37

7.5 Defrost Control(Heating) .............................................................................................38

- 14 -

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 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

- 15 -

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 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.

- 16 -

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.

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

- 17 -

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 operated.

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

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

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

• When the Jet Cool key is input, the upper/lower vanes are reset to those of the initial cooling mode and then operated

in order that the air outflow could reach further.

2.7 Swirl wind Swing

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

• The diagonal two louvers are opened the more larger

than the other louvers. After one minute, it is opposite.

• Comparison of Air Flow Types

4-Open (conventional) Swirl Swing (New)

LL Very low, In heating mode

L Low M Med H High

SH Super high

Auto Chaos wind

Step Discription

Vane 4

Vane 2

Vane 1 Vane 3

- 18 -

LGE Internal Use Only

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

+

- 19 -

LGE Internal Use Only

Part 2 Functions & Controls

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

- 20 -

LGE Internal Use Only

Part 2 Functions & Controls

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

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 table 1 on the next page.)

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

- 21 -

LGE Internal Use Only

Static pressure(mmAq)

Setting value

012

Model name

Step(Hi/Med/Lo)

8 CMM 220 215 210

7 CMM 240 235 230

6 CMM 255 250 245

10 CMM 210 85 150

9 CMM 215 190 170

8 CMM 220 200 175

14 CMM 170 150 130

13 CMM 185 165 145

12 CMM 200 180 160

AMNH096BTG0 [MB09AHL NT0]

AMNH126BTG0 [MB12AHL NT0]

AMNH186BTG0 [MB18AHL NT0]

Static pressure(mmAq)

Setting value

01234

Model name

Step(Hi/Med/Lo)

8.5 CMM 75 84 94 104 114

7.5 CMM 69 77 88 99 110

6.5 CMM 62 71 83 95 106

9.5 CMM 82 90 99 109 118

8.5 CMM 75 84 94 104 114

7.5 CMM 69 77 88 99 110

15 CMM 90 97 105 114 122

13.5 CMM 82 90 99 109 119

11.5 CMM 75 84 93 103 114

17 CMM 110 117 125 129 -

15 CMM 100 107 115 121 127

13.5 CMM 90 97 105 114 122

AMNH09GB1A0/1 [MB09AHL N10/1]

AMNH12GB1A0/1 [MB12AHL N10/1]

AMNH18GB2A0/1 [MB18AHL N20/1]

AMNH24GB2A0/1 [MB24AHL N20/1]

E.S.P. setting value (reference)

Static pressure(mmAq) 0 2 4

Model name

Step(Hi/Med/Lo)

Setting value

10.5CMM 225 220 210

AMNH096BPA0

9CMM 245 240 230

8.5CMM 254 253 250

11.5CMM 210 200 100

AMNH126BPA0

10CMM 235 230 220

8.5CMM 254 251 245

[ 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.

- 22 -

LGE Internal Use Only

Part 2 Functions & Controls

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.

- 23 -

LGE Internal Use Only

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+0.5°C Compressor OFF Temp. ➔ Setting Temp-0.5°C

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

5. Reliability

Intake air Temp. Setting Temp.

26°C ≤ intake air temp. 25°C

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

intake air temp. < 18°C18°C

- 24 -

LGE Internal Use Only

Part 2 Functions & Controls

6. Convenience Functions & Controls

6.1 Auto changeover operation

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

• When room temperature vary over ±2°C with respect to setting temperature, air conditioner keeps the room tempera-

ture in ±2°C with respect to setting temperature by auto change mode.

SET Temp.

+0.5°C

-0.5°C

-2°C

+4°C +2°C

Cooling operation

Heating operation Cooling

operation

Cooling thermo off

Heating thermo off

Switching point

- 25 -

LGE Internal Use Only

Part 2 Functions & Controls

■ Cooling & heating Opeattions

6.1.1 Cooling Mode

Setting Temp.

-0.5°C.

+0.5°C.

Comp. OFF

Comp. ON Comp. OFF Comp. ON

INV. Comp. Frequency

Constant Comp.

Low

High Low

Thermo. ON

Thermo OFF

High

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

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

• Compressor turned off when

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

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

• Compressors two minutes time delay.

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

- 26 -

LGE Internal Use Only

Part 2 Functions & Controls

6.1.2 Heating Mode

+2°C.

+4°C.

Comp. OFF

Comp. ON Comp. OFF Comp. ON Comp. OFF

INV. Comp. Frequency

Constant Comp.

Low

High LowHigh Comp. OFF

Thermo ON

Thermo OFF

Setting

Temp.

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

temp., frequency restrictions.

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

onds.

• Condition of compressor turned off

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

• Condition of compressor turned on

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

* Condition of indoor fan turned off

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

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

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

• Compressor 2minutes delay

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

CST/Duct/CVT type indoor unit matched with

Universal Outdoor unit

CST/ Duct/CVT type indoor unit

matched with Single Outdoor unit/Multi

Outdoor unit/Multi V Outdoor unit

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

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

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

- 27 -

LGE Internal Use Only

Part 2 Functions & Controls

* Some Models are different with temperature of indoor fan ON/OFF

■ Heating Mode Operation Details

The unit will operate according to the setting by the remote controller and the operation diagram is shown as following.

COMP

Outdoor fan

Indoor fan

4way valve

Setting Temperature

(Thermo ON)

Setting Temperature

+3°C

(Thermo OFF)

Indoor unit Heat-Exchanger temperature

1min

Minimum

3min

1min

3min

Setting

fan

speed

Setting

fan

speed

Setting

fan

speed

ON

Low

LowLowLow

Low

Lo

OffOffOff

ON

OFF

Low fan during 10sec

A

B

Intake Air Temperature

• Compressor-off interval : - While the indoor Heat-Exchanger temperature is higher than 40°C, fan operates at low speed, when it becomes lower than 40°C fan stops.

- For eluminating latent heat-loss, fan operates at low speed for 10 seconds periodically.

40°C

33°C

30°C

27°C 20°C

ON ON

Off Off

Low Low

1min1min

20°C

27°C

33°C

Indoor unit

Heat-Exchanger

temperature

Setting fan

speed

Setting fan

speed

Compressor Outdoor fan

Indoor fan

4way Valve

ON

- 28 -

LGE Internal Use Only

Part 2 Functions & Controls

6.2 Auto cleaning operation

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

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

- 29 -

LGE Internal Use Only

Part 2 Functions & Controls

6.3 Auto Operation (Fuzzy Operation)

• When any of operation mode is not selected like the moment of the power on or when 3 hrs has passed since the operation off, the operation mode is selected.

• When determining the operation mode, the compressor, the outdoor fan, and the 4 way valve are off and only the indoor fan is operated for 15 seconds. Then an operation mode is selected according to the intake air temp at that moment as follows. 24°C ≤ Inatake Air Temp ➔ Fuzzy Operation for Cooling

21°C ≤ Inatake Air Temp < 24°C ➔ Fuzzy Operation for Dehumidification Inatake Air Temp < 21°C ➔ Fuzzy Operation for Heating

• If any of the operation modes among cooling / dehumidification / heating mode operations is carried out for 10 sec or longer before Fuzzy operation, the mode before Fuzzy operation is operated.

6.3.1 Fuzzy Operation for Cooling

• According to the setting temperature selected by Fuzzy rule, when the intake air temp is 0.5°C or more below the setting temp, the compressor is turned off. When 0.5°C or more above the setting temp, the compressor is turned on. Compressor ON Temp ➔ Setting Temp + 0.5°C

Compressor OFF Temp ➔ Setting Temp + 0.5°C

• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the intake air temp at that time. 26°C≤ Intake Air Temp ➔ 25°C

24°C≤ Intake Air Temp<26°C ➔ Intake Air Temp + 1°C 22°C≤ Intake Air Temp<24°C ➔ Intake Air Temp + 0.5°C 18°C≤ Intake Air Temp<22°C ➔ Intake Air Temp Intake Air Temp<18°C ➔ 18°C

• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature automatically according to the Fuzzy rule.

• While in Fuzzy operation, the airflow speed of the indoor fan is automatically selected according to the temperature.

6.3.2 Fuzzy Operation for Dehumidification

• According to the setting temperature selected by Fuzzy rule, when the intake air temp is 0.5°C or more below the setting temp, the compressor is turned off. When 0.5°C or more above the setting temp, the compressor is turned on. Compressor ON Temp ➔ Setting Temp + 0.5°C

Compressor OFF Temp ➔ Setting Temp+0.5°C

• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the intake air temp at that time. 26°C ≤ Intake Air Temp ➔ 25°C

24°C ≤ Intake Air Temp<26°C ➔ Intake Air Temp+1°C 22°C ≤ Intake Air Temp<24°C ➔ Intake Air Temp+0.5°C 18°C ≤ Intake Air Temp<22°C ➔ Intake Air Temp Intake Air Temp<18°C ➔ 18°C

• When the Fuzzy key (Temperature Control key) is input after the initial setting temperature is selected, the Fuzzy key value and the intake air temperature at that time are compared to select the setting temperature automatically according to the Fuzzy rule.

• While in Fuzzy operation, the airflow speed of the indoor fan repeats the low airflow speed or pause as in dehumidification operation.

LG FM21AH UE3, FM30AH UE3, FM25AH UE3, FM27AH UE3, FM38AH UH3 Svc Manual

Specifications and Main Features

Frequently Asked Questions

User Manual