Lg A2Uc243Fa0 Lmu240Ce Users Manual 3828A20462Z(Ç¥Áö)

AMNH093APM0(LMAN090HNS) .php?file=LG-2787

A2UH243FA0(LMU240HE) 121736-1

AMNH123DEA0 (LMN120HE) to the manual 74efb757-53ca-4692-b4b7-e940b111f303

2015-01-26

: Lg Lg-A2Uc243Fa0-Lmu240Ce-Users-Manual-228102 lg-a2uc243fa0-lmu240ce-users-manual-228102 lg pdf

Open the PDF directly: View PDF .
Page Count: 86

Download
Open PDF In Browser	View PDF

website http://www.lgservice.com

LG
Multi Type Air Conditioner
SERVICE MANUAL
MODEL
• Indoor Unit:

Room Type
AMNH093D4A0(LMN090HE)
AMNH123DEA0 (LMN120HE)
AMNC093D4A0(LMN090CE)
AMNC123DEA0 (LMN120CE)

Art Cool Type
AMNH093APM0(LMAN090HNS)
AMNH123APM0(LMAN120HNS)
AMNC093APM0(LMAN090CNS)
AMNC123APM0(LMAN120CNS)

• Outdoor Unit: A2UH243FA0(LMU240HE)
A2UC243FA0 (LMU240CE)

CAUTION
• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.
• ONLY FOR AUTHORIZED SERVICE PERSONNEL.

Multi type Air Conditioner Service Manual

TABLE OF CONTENTS
Model Number Nomenclature ....................................................................................................................3
Symbols Used in this Manual ...................................................................................................................4
Safety Precautions......................................................................................................................................5
Dimensions................................................................................................................................................11
Indoor Unit.............................................................................................................................................11
Outdoor Unit ...........................................................................................................................................12
Product Specifications .............................................................................................................................13
Installation .................................................................................................................................................15
Installation Parts.....................................................................................................................................15
Installation Tools.....................................................................................................................................15
Select the best location .........................................................................................................................16
Piping length and elevation ....................................................................................................................17
Fixing Installation Plate(Standart Type)..................................................................................................18
Preparing work for Installation (Artcool Type Only) ................................................................................19
Flaring Work and Connection of Piping..................................................................................................21
Flaring work............................................................................................................................................21
Connecting the Piping ............................................................................................................................22
Connecting the Cable between Indoor Unit and Outdoor Unit .............................................................30
Connect the cable to the Indoor unit. .....................................................................................................30
Connect the cable to the Outdoor unit....................................................................................................31
Connection method of the connecting cable(Example) ..........................................................................32
Connect the cable to the indoor unit.......................................................................................................33
Checking the Drainage, Forming the Pipings and Long Pipe Setting .................................................34
Checking the drainage............................................................................................................................34
Forming the piping..................................................................................................................................35
Air Purging and Evacuation .....................................................................................................................36
Checking method ...................................................................................................................................36
Evacuation..............................................................................................................................................37
Charging ....................................................................................................................................................38
Test Running .............................................................................................................................................39
Operation ...................................................................................................................................................40
Function of control..................................................................................................................................40
Function of Indoor Unit ...........................................................................................................................45
Function of Outdoor Unit ........................................................................................................................47
Remote Control Operation .....................................................................................................................48
Disassembly ..............................................................................................................................................49
Indoor Unit..............................................................................................................................................49
Schematic Diagram...................................................................................................................................54
Electronic Control Device .......................................................................................................................54
Wiring Diagram.......................................................................................................................................58
Components Locations...........................................................................................................................59
Troubleshooting Guide .............................................................................................................................64
Refrigeration Cycle Diagram ..................................................................................................................64
Self-diagnosis Function ..........................................................................................................................65
Cycle Troubleshooting Guide..................................................................................................................66
Electronic Parts Troubleshooting Guide .................................................................................................67
General Information................................................................................................................................72
2-way, 3-way Valve ....................................................................................................................................78
Exploded View & Replacement Parts List ..............................................................................................82
Indoor Unit .............................................................................................................................................82
Outdoor Unit ..........................................................................................................................................86

2 Multi type Air Conditioner

Model Number Nomenclature

Model Number Nomenclature
Indoor Unit
AMN

0
Serial Number
Function
A : Basic, L : Nano Plasma + Auto Clean(Wall Mounted)
C: Plasma(Ceiling Cassette), G: Low Static Motor

ART COOL(DELUXE) Type Front Panel Color
B : Blue, D : Wood, M : Metal, R : Mirror, W : White

Chassis Name
Indoor Unit Type
Wall mounted split
D : D- look type
M : M- look type

L : L- look type G : G- look type
N : N- look type

Artcool type
A : standard/wide type D : Deluxe type
B : Ceiling Concealed Duct
V : Ceiling & Floor(Convertible)

Electrical Rating
3: 1Ø, 208~230V, 60Hz

Nominal Cooling Capacity in Btu/h
Ex) 9,000 Btu/h '09', 12,000 Btu/h '12'

Model Type
H: Heat Pump C: Cooling Only

Outdoor Unit

MPS Variable Multi System Indoor Unit

A2U

0
Serial Number
Function
A : Basic

Multi Type
F : Free Joint Multi Type

Electrical Ratings
3: 1Ø, 208~230V, 60Hz

Nominal Cooling Capacity in Btu/h
Ex) 24,000 Btu/h '24', 36,000 Btu/h '36'

Model Type
H: Heat Pump C: Cooling Only

R-410A MPS Variable Multi System Outdoor Unit
And No. of Connectable Indoor Units
Ex) A2U : Connectable max. 2 Indoor Units

Service Manual 3

Model Number Nomenclature

Combination table
Heating

Cooling
Operation

Combination of Indoor Unit(kBtu/h)
Each Capacity
Unit-A

1 Unit

2 Unit

Unit-B

9
12

Total

UNIT-A(Btu/h) UNIT-B(Btu/h)

9000

Total Capacity

Each Capacity

Btu/h

9000

2637

UNIT-A(Btu/h) UNIT-B(Btu/h)
9000

Total Capacity
Btu/h

9000

2637

12000

3516

12000

3516

9000

18000

5275

9000

18000

5275

9000

12000

21000

6154

9000

12000

21000

6154

12000

24000

7033

12000

24000

7033

Notes :
1.Cooling Capacity is based on : indoor temp. 26.7°C(80.1°F)DB, 19.4°C(66.9°F)WB; outdoor temp. 35°C(95°F)DB, 23.9°C(75°F)WB
2.Heating Capacity is based on : indoor temp. 21.1°C(70°F)DB, 15.6°C(60.1°F)WB; outdoor temp. 8.3°C(46.9°F)DB, 6.1°C(43°F)WB
3.The total ability of connected a indoor unit is up to 24k Btu/h

Symbols Used in this Manual
This symbol alerts you to the risk of electric shock.
This symbol alerts you to hazards that could cause harm to the
air conditioner.
NOTICE

This symbol indicates special notes.

4 Multi type Air Conditioner

Safety Precautions

Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions must
be followed.
■ Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is
classified by the following indications.

WARNING

This symbol indicates the possibility of death or serious injury.

CAUTION

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.

WARNING
■ Installation
Do not use a defective or underrated circuit breaker. Use this
appliance on a dedicated circuit.
• There is risk of fire or electric
shock.

Install the panel and the cover
of control box securely.
• There is risk of fire or electric
shock.

For electrical work, contact the
dealer, seller, a qualified electrician,
or an Authorized Service Center.
• Do not disassemble or repair the
product. There is risk of fire or
electric shock.

Always install a dedicated circuit and breaker.
• Improper wiring or installation may
cause fire or electric shock

Always ground the product.

• There is risk of fire or electric
shock.

Use the correctly rated breaker or fuse.
• There is risk of fire or electric
shock.

Service Manual 5

Safety Precautions
Do not modify or extend the
power cable.
• There is risk of fire or electric
shock.

For installation, always contact the dealer or an
Authorized Service Center.
• There is risk of fire, electric shock,
explosion, or injury.

Do not let the air conditioner
run for a long time when the
humidity is very high and a
door or a window is left open.

Do not install, remove, or reinstall the unit by yourself
(customer).
• There is risk of fire, electric shock,
explosion, or injury.

Do not install the product on a
defective installation stand.
• It may cause injury, accident, or
damage to the product.

Take care to ensure that
power cable could not be
pulled out or damaged during
operation.

• Moisture may condense and wet or • There is risk of fire or electric
damage furniture.
shock.

6 Multi type Air Conditioner

Be cautious when unpacking
and installing the product.
• Sharp edges could cause injury.
Be especially careful of the case
edges and the fins on the condenser and evaporator.

Be sure the installation area
does not deteriorate with age.
• If the base collapses, the air conditioner could fall with it, causing
property damage, product failure,
and personal injury.

Do not place anything on the
power cable.

• There is risk of fire or electric
shock.

Safety Precautions
Do not plug or unplug the
power supply plug during
operation.
• There is risk of fire or electric
shock.

Do not allow water to run into
electric parts.
• It may cause There is risk of fire,
failure of the product, or electric
shock.

Do not touch(operate) the
product with wet hands.
• There is risk of fire or electrical
shock.

Do not store or use flammable
gas or combustibles near the
product.
• There is risk of fire or failure of
product.

Do not place a heater or other
appliances near the power
cable.
• There is risk of fire and electric
shock.

Do not use the product in a
tightly closed space for a long
time.
• Oxygen deficiency could occur.

Gasolin

When flammable gas leaks,
turn off the gas and open a
window for ventilation before
turn the product on.
• Do not use the telephone or turn
switches on or off. There is risk of
explosion or fire

If strange sounds, or small or
smoke comes from product.
Turn the breaker off or disconnect the power supply cable.
• There is risk of electric shock or
fire.

Stop operation and close the
window in storm or hurricane.
If possible, remove the product from the window before
the hurricane arrives.
• There is risk of property damage,
failure of product, or electric shock.

Service Manual 7

Safety Precautions
Do not open the inlet grill of the product
during operation. (Do not touch the electrostatic filter, if the unit is so equipped.)
• There is risk of physical injury,
electric shock, or product failure.

When the product is soaked
(flooded or submerged), contact
an Authorized Service Center.
• There is risk of fire or electric
shock.

Ventilate the product from time to time when
operating it together with a stove, etc.
• There is risk of fire or electric shock.

Be cautious that water could
not enter the product.
• There is risk of fire, electric shock,
or product damage.

Turn the main power off when cleaning or
maintaining the product.
• There is risk of electric shock.

When the product is not be used for a long time, disconnect the power supply plug or turn off the breaker.

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

• There is risk of product damage or failure, or unintend- • This could result in personal injury and product damed operation.
age.

CAUTION
■ Installation
Always check for gas (refrigerant) leakage after installation or repair of product.
• Low refrigerant levels may cause
failure of product.

Install the drain hose to ensure that
water is drained away properly.

Keep level even when
installing the product.

• A bad connection may cause water • To avoid vibration or water leakleakage.
age.

90°

8 Multi type Air Conditioner

Safety Precautions
Do not install the product
where the noise or hot air
from the outdoor unit could
damage the neighborhoods.
• It may cause a problem for your
neighbors.

Use two or more people to lift
and transport the product.

• Avoid personal injury.

Do not install the product
where it will be exposed to
sea wind (salt spray) directly.
• It may cause corrosion on the
product. Corrosion, particularly on
the condenser and evaporator fins,
could cause product malfunction or
inefficient operation.

■ Operational
Do not expose the skin directly to cool air for
long periods of time.
(Don't sit in the draft.)
• This could harm to your health.

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

Do not use the product for special purposes,
such as preserving foods, works of art, etc. It
is a consumer air conditioner, not a precision
refrigeration system.
• There is risk of damage or loss of property.

Use a soft cloth to clean. Do
not use harsh detergents, solvents, etc.
• There is risk of fire, electric shock,
or damage to the plastic parts of
the product.

Do not touch the metal parts of
the product when removing the
air filter. They are very sharp!
• There is risk of personal injury.

x
Wa Thinner

Service Manual 9

Safety Precautions
Do not step on or put anyting
on the product. (outdoor
units)

Always insert the filter securely. Clean the filter every two
weeks or more often if necessary.

Do not insert hands or other
objects through the air inlet or
outlet while the product is
operated.

• There is risk of personal injury and
failure of product.

• A dirty filter reduces the efficiency
of the air conditioner and could
cause product malfunction or damage.

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

Do not drink the water drained
from the product.

Use a firm stool or ladder
when cleaning or maintaining
the product.

Replace the all batteries in the
remote control with new ones
of the same type. Do not mix
old and new batteries or different types of batteries.

• It is not sanitary and could cause
serious health issues.

• Be careful and avoid personal
injury.

Do not recharge or disassemble the batteries.
Do not dispose of batteries in a fire.

• They may burn or explode.

10 Multi type Air Conditioner

• There is risk of fire or explosion

If the liquid from the batteries gets onto your
skin or clothes, wash it well with clean water.
Do not use the remote if the batteries have
leaked.
• The chemicals in batteries could cause burns or other
health hazards.

Dimensions

Dimensions
Indoor Unit
1. Split Type Indoor

2. Art Cool Type Indoor Unit
W

Pipe Hole

Hanger Hole

Fix Hole

Installation plate

Model
Dimension

Split Type

ARTCOOL Type

9 kBtu/h

12 kBtu/h

SP3
9 kBtu/h

12 kBtu/h

840

895

570

270

282

568

153

165

129

Service Manual 11

Dimensions

Outdoor Unit

MODEL
DIM

UE1
24kBtu/h

870

800

320

370

775

546

160

12 Multi type Air Conditioner

Product Specifications

Product Specifications
Indoor Unit
Indoor Unit Type

Wall Mounted

Model
Nominal Cooling Capacity ★
Nominal Heating Capacity ★
Air Circulation
H/M/L
Setting temperature range(cool/heat)
Fan motor
Output
Model
Input
Running Current
Fan
Type
No. Used / Diameter
Noise Level (Sound Press,1m) H/M/L
Temperature controller
Coil
Tube Size (OD)
Fins per inch
No. of Rows & Column
Dehumidification Rate
Dimensions (W*H*D)
Net Weight
Piping Connection
Liquid
Gas
Drain hose (ID Ø)
Packing Dimension (W*H*D)
Stuffing Quantity
With(Without) S/Parts

kcal/h(W)
Btu/h
kcal/h(W)
Btu/h
CMM(CFM)
°C
W
V
A
EA/inch(mm)
dBA
inch(mm)

l/h
inch(mm)
kg(lbs)
inch(mm)
inch(mm)
mm
inch(mm)
20/40ft(hi-c)

AMNC093D4A0(LMN090CE)

AMNH093D4A0(LMN090HE)

AMNC123DEA0 (LMN120CE)

AMNH123DEA0 (LMN120HE)

2,267(2,637)
9,000
8.2(289)
18~30
15
DL-88430LGIF
DC36
0.15
Cross Flow Fan
1/3.74(95)
31 / 29 / 22
Thermistor
0.197(5.0)
20
2R,15C
33.0*10.6*6.0(840*270*153)
7(15.4)
1/4 (6.35)
3/8 (9.52)
20
35.7*13.1*8.8(906*332*223)
440/910 (1091)

2,267(2,637)
9,000
2,267(2,637)
9,000
8.2(289)
16~30
15
DL-88430LGIF
DC36
0.15
Cross Flow Fan
1/3.74(95)
31 / 29 / 22
Thermistor
0.197(5.0)
20
2R,15C
1.1
33.0*10.6*6.0(840*270*153)
7(15.4)
1/4 (6.35)
3/8 (9.52)
20
35.7*13.1*8.8(906*332*223)
440/910 (1091)

3,023(3,516)
12,000
9.4(332)
18~30
15
DL-88430LGIF
DC36
0.15
Cross Flow Fan
1/3.74(95)
36 / 32 / 29
Thermistor
0.197(5.0)
18
2R,15C
35.2*11.1*6.5(895*282*165)
9.5(20.9)
1/4 (6.35)
3/8 (9.52)
20
38.3*9.1*14.6(973*231*372)
353/719 (792)

3,023(3,516)
12,000
3,023(3,516)
12,000
9.4(332)
16~30
15
DL-88430LGIF
DC36
0.15
Cross Flow Fan
1/3.74(95)
36 / 32 / 29
Thermistor
0.197(5.0)
18
2R,15C
1.2
35.2*11.1*6.5(895*282*165)
9.5(20.9)
1/4 (6.35)
3/8 (9.52)
20
38.3*9.1*14.6(973*231*372)
353/719 (792)

Indoor Unit Type

Artcool

Model
Nominal Cooling Capacity ★
Nominal Heating Capacity ★
Air Circulation
H/M/L
Setting temperature range(cool/heat)
Fan motor
Output
Model
No. of Poles
Input
Running Current
Fan
Type
No. Used / Diameter
Noise Level (Sound Press,1m) H/M/L
Temperature controller
Coil
Tube Size (OD)
Fins per inch
No. of Rows & Column
Dehumidification Rate
Dimensions (W*H*D)
Net Weight
Piping Connection
Liquid
Gas
Drain hose (ID Ø)
Packing Dimension (W*H*D)
Stuffing Quantity
With(Without) S/Parts

AMNC093APM0(LMAN090CNS)

AMNH093APM0(LMAN090HNS)

AMNC123APM0(LMAN120CNS)

AMNH123APM0(LMAN120HNS)

kcal/h(W)
Btu/h
kcal/h(W)
Btu/h
CMM(CFM)
°C
W

2,267(2,637)
9,000
7.5(264)
18~30
24
DL-89812LGIB

2,267(2,637)
9,000
2,267(2,637)
9,000
7.5(264)
16~30
24
DL-89812LGIB

3,023(3,516)
12,000
8.5(300)
18~30
24
DL-89812LGIB

3,023(3,516)
12,000
3,023(3,516)
12,000
8.5(300)
16~30
24
DL-89812LGIB

V
A

DC36
1.5
Turbo Fan
1/24.32(617.7)
37 / 31 / 27
Thermistor
0.197(5.0)
20
2R,20C
22.4*22.4*5.1(570*568*129)
9(19.84)
1/4 (6.35)
3/8 (9.52)
20
26.2*25.7*9.1(665*653*231)
237/534(239/539)

DC36
1.5
Turbo Fan
1/24.32(617.7)
37 / 31 / 27
Thermistor
0.197(5.0)
20
2R,20C
1.1
22.4*22.4*5.1(570*568*129)
9(19.84)
1/4 (6.35)
3/8 (9.52)
20
26.2*25.7*9.1(665*653*231)
237/534(239/539)

DC36
1.5
Turbo Fan
1/24.32(617.7)
43 / 39 / 31
Thermistor
0.197(5.0)
20
2R,20C
22.4*22.4*5.1(570*568*129)
9(19.84)
1/4 (6.35)
3/8 (9.52)
20
26.2*25.7*9.1(665*653*231)
237/534(239/539)

DC36
1.5
Turbo Fan
1/24.32(617.7)
43 / 39 / 31
Thermistor
0.197(5.0)
20
2R,20C
1.4
22.4*22.4*5.1(570*568*129)
9(19.84)
1/4 (6.35)
3/8 (9.52)
20
26.2*25.7*9.1(665*653*231)
237/534(239/539)

EA/inch(mm)
dBA
inch(mm)

l/h
inch(mm)
kg(lbs)
inch(mm)
inch(mm)
mm
inch(mm)
20/40ft(hi-c)

Note : 1.★ See the page "Combination Table"
2. Due to our policy of innovation some specifications may be changed without notification.

Service Manual 13

Product Specifications
Outdoor Unit - Multiple piping models
Model
Cooling Capacity★

Heating Capacity★

Input★
Running Current★(208/230V)

Cooling
Heating
Cooling
Heating

Btu/hr
W
kcal/hr
Btu/hr
W
kcal/hr
W
W
A
A
Ø,V,Hz

Power Supply
Max. Number of Connectable Indoor Units
Compressor
Type
(Constant)
Model
Motor Type
Quantity
Ea
Motor Input
W
Oil Charge
cc
Oil Type
Capacitor
µF/Vac
O.L.P Type(model name)
Compressor
Type
(Constant)
Model
Motor Type
Quantity
Ea
Motor Input
W
Oil Charge
cc
Oil Type
Capacitor
µF/Vac
O.L.P Type(model name)
Refrigerant charge
Charge
g(oz)
Type
Control
Coil
Tube Size (OD)
inch(mm)
Fins per inch
No. of Rows & Column/No.
Fan motor
Model
Output
W
Capacitor
µF/Vac
Fan
Type
No. Used / Diameter
EA/inch(mm)
Discharge
Side / Top
Air Circulation
Outdoor
CMM(CFM)
Noise Level(H/L) at 230V Sound Press,1m
dB(A) 1
Defrosting
SVC Valve
Liquid
inch(mm)
Gas
Dimensions
W*H*D
inch(mm)
Net Weight
Outdoor
kg(lbs)
Max. Interunit Piping Length Total of Each Room
m
For One Room
m
Max. Installation
Indoor Unit~Outdoor Unit
m
Height Difference
Indoor Unit~Indoor Unit
m
Packing Dimension
W*H*D
inch(mm)
Testing Combinations
Stuffing Quantity
20/40ft

A2UC243FA0(LMU240CE)

A2UH243FA0(LMU240HE)

9,000~24,000
2637~7033
2267~6037
1170~2390
7.7~10.1
1,208/230,60
2
Rotary
GK094K
Hermetic
1
955
330±10
FVC68D
30 / 370
External Type(MRA98996-12026)
Rotary
GK141K
Hermetic
1
1430
350±10
FVE
35 / 370
External Type(MRA12105-12026)
1600
R410A
L.E.V
0.276(7.0)
18
2R,36C
IC-1640LG GE
90
6/370
Propeller
1 / 460
Side
53(1872)
54
1/4 (6.35) * 2EA
3/8 (9.52) * 2EA
34.3*31.5*12.6 (870*800*320)
69(152)
30
15
7.5
7.5
40.2*34.3*17.3 (1020*870*440)
SE 12K +SE 12K
54/114

9,000~24,000
2637~7033
2267~6037
9,000~24,000
2637~7033
2267~6037
1170~2390
1220~2440
7.7~10.1
7.4~9.8
1,208/230,60
2
Rotary
GK094K
Hermetic
1
955
330±10
FVC68D
30 / 370
External Type(MRA98996-12026)
Rotary
GK141K
Hermetic
1
1,430
350±10
FVE
35 / 370
External Type(MRA12105-12026)
1600
R410A
L.E.V
0.276(7.0)
18
2R,36C
IC-1640LG GE
90
6/370
Propeller
1 / 460
Side
53(1872)
54
Invertion Cycle
1/4 (6.35) * 2EA
3/8 (9.52) * 2EA
34.3*31.5*12.6 (870*800*320)
69(152)
30
15
7.5
7.5
40.2*34.3*17.3 (1020*870*440)
SE 12K +SE 12K
54/114

Notes: 1. Capacities are based on the following conditions:
Cooling: -Indoor Temperature 26.7°C(80.1°F)DB/19.4°C66.9°F)WB
-Outdoor Temperature 35°C(95°F)DB/23.9°C(75°F)WB
-Interconnecting Piping Length 7.5m
-Level Difference of Zero.
Heating: -Indoor Temperature 21.1°C(70°F)DB/15.6°C(60.1°F)WB
-Outdoor Temperature 8.3°C(46.94°F)DB/6.1°C(42.98°F)WB
-Interconnecting Piping Length 7.5m
-Level Difference of Zero.
2. Capacities are Net Capacities.
3. ★ : See the page "Combination Table"
4. Due to our policy of innovation some specifications may be changed without notification.

14 Multi type Air Conditioner

Installation

Installation
Read carefully, and then follow step by step.

Installation Parts
Installation plate

Type "A" screw and plastic anchor

Type "B" screw

Remote Control Holder

Installation Tools
Figure

Name

Figure

Name

Screw driver

Ohmmeter

Electric Drill

Hexagonal wrench

Measuring Tape, Knife

Ammeter

Hole Core Drill

Gas Leak Detector

Spanner

Thermometer,
Level

Torque wrench

Flaring Tool Set

Service Manual 15

Installation

Select the best location
Indoor unit
1. Do not have any heat or steam near the unit.
2. Select a place where there are no obstacles in front
of the unit.

More than 5cm
(2.0 inch)

3. Make sure that condensation drainage can be conveniently routed away.
4. Do not install near a doorway.

More than 2.3m
(90.6 inch)

5. Ensure the spaces indicated by arrows from the wall,
ceiling, fence or other obstacles.

More than 5cm
(2.0 inch)

6. Use a stud finder to locate studs to prevent unnecessary damage to the wall.
CAUTION: Install the indoor unit
on the wall where the height from
the floors more than 2.3m(7.5ft).

More than 10cm
More than 50cm

More than 50cm

Outdoor unit
1. If an awning is built over the unit to prevent direct
sunlight or rain exposure, make sure that heat radiation from the condenser is not restricted.
2. Ensure that the spaces indicated by arrows around
front, back and side of the unit.
3. Do not place animals and plants in the path of the
warm air.
4. Take the air conditioner weight into account and
select a place where noise and vibration are minimum.
5. Select a place so that the warm air and sound from
the air conditioner do not disturb neighbors.

Rooftop Installations:
If the outdoor unit is installed on a roof structure, be
sure to level the unit. Ensure the roof structure and
anchoring method are adequate for the unit location.
Consult local codes regarding rooftop mounting.

16 Multi type Air Conditioner

More than 2m
more than 20cm
(7.9 inch)
more than 20cm
(7.9 inch)

more than 70cm
(27.6 inch)

Installation

Piping length and elevation
Multi Piping Type
Capacity(Btu/h)

24k

Max Elevation
Max total length of Max length of each Min length of each
between each
all pipes (A+B)
pipe (A/B)
pipe (A/B)
indoor unit and outdoor unit (h1)
30m(100ft)

15m(50ft)

3m(10ft)

7.5m(25ft)

Max elevation
between indoor
units (h2)
7.5m(25ft)

Pipe Size

Indoor Capacity
(Btu/h)

Gas

Liquid

3/8"

1/4"

7.5m(25ft)

20g/m(0.32oz/ft)

12K

3/8"

1/4"

7.5m(25ft)

20g/m(0.32oz/ft)

24k

Standard Length

Additional Refrigerant

h2
B

CAUTION: Capacity is based on standard length and maximum allowance length is on the
basis of reliability. Oil trap should be installed every 5~7 meters (16.4~23.0ft).

Service Manual 17

Installation

Fixing Installation Plate(Standard Type)
The wall you select should be strong and solid enough to
prevent vibration
1. Mount the installation plate on the wall with
type "A" screws. If mounting the unit on a concrete wall,
use anchor bolts.
• Mount the installation plate horizontally by aligning the
centerline using a level.

Installation Plate

Chassis
Hook
Type "A" screw

2. Measure the wall and mark the centerline. It is also
important to use caution concerning the location of the
installation plate-routing of the wiring to power outlets is
through the walls typically. Drilling the hole through the
wall for piping connections must be done safely.
CHASSIS
(Grade)
S4
SE

Distance (mm)
A
50
65

B
105
110

18 Multi type Air Conditioner

C
59
85

Installation plate

D
105
110

Ø70mm

C
Left rear piping

B
A
Right rear piping

Ø70mm

Installation

Preparing work for Installation (Artcool Type Only)
Open panel front
1. First, push the front panel backward and lift it up to remove the two screws.
2. The moment of lifting the both lower parts of panel front, you can hear sound this panel came out, In this time panel front is
separated
3. After pull down this panel a bit, and separate connecting wire with product.

Panel Front
Connector

Remove cover pipe and cover side
1. Remove two screws(for fixing cover pipe)
2. Pull up the cover side of desired connecting direction, then cover
side is separated.
3. In case of connecting direction is left or right, path through the
hole of cover side.
CAUTION: After removing the pipe hole, cut the
burr for safety.
NOTICE

Pipe hole

When connecting pipe path through rear
wall, don’t remove the hole.

Drain hose junction
1. Remove the rubber stopple of desired direction of
drainage.
2. As the following picture, Insert drain hose in the
handle of drain pan, and join drain hose and connecting hose.

Adhesive

Connecting
part
Drain
hose

Only one
desiring direction

rubber cap

Service Manual 19

Installation
■ Sticking the installation guide map and
fixing Indoor unit
1. Put an Installation Guide Map on the desired
surface.

7. Drill the piercing part for connecting pipe as
diameter 50mm. (In case of piercing rear surface)

INSTALLATION GUIDE MAP

Refer to No. 5 on this page when making a hole in the wall.

2. Make a hole with diameter of 6mm and depth of
30-35mm when piercing a screw point.
IN
ST
AII
AT
IO
N

8. First, Drive the two points of the upper parts by
screws. (Leave 10mm for hanging product)

GU
ID
EM
AP

IN
ST
AL
LA
TIO
N

3. Drive the fore plastic anchors into drilled points.
IN
ST
AL
LA
TIO
N

GU
ID
EM
AP

9. Drive the lower parts after facing the hole of
product with plastic anchors, and fix completely
the upper screws.
Plastic anchors

Plastic anchors

4. Hang the hole of product at the upper screws.
(In this time, Remove the map)
INS
TAL
LAT
ION
GUID
EM
AP

(Falling attention)

In case of nothing wrong in the matter,
connect the pipe and the wire.
(Installation manual reference)

Hanger hole
(Rear side of
product)

5. Check the fixed product with light power.

■ Drill a hole in the wall
• Drill the piping hole with a ø50mm hole core drill. Drill
the piping hole at either the right or the left with the hole
slightly slanted to the outdoor side.

WALL
Indoor

Outdoor

IN
ST
AL
LA
TIO
N

GU
ID
EM
AP

20 Multi type Air Conditioner

(0.2~0.3")

Horizontality

5-7mm

6. Look at suited horizon by horizontal meter on
the horizontal setting line, and Fix lightly the
map by adhesive tape.

Flaring Work and Connection of Piping

Flaring Work and Connection of Piping
Flaring work
Main cause for gas leakage is due to defect in flaring work. Carry out correct flaring work in the following procedure.

Cut the pipes and the cable.
1. Use the piping kit accessory or the pipes purchased locally.
2. Measure the distance between the indoor and the outdoor unit. Copper
pipe
3. Cut the pipes a little longer than measured distance.

Slanted Uneven Rough

90°

4. Cut the cable 1.5m (5.0ft) longer than the pipe length.

Burrs removal
1. Completely remove all burrs from the cut cross section of
pipe/tube.
2. Put the end of the copper tube/pipe in a downward direction
as you remove burrs in order to avoid dropping burrs into the
tubing.

Pipe
Reamer

Point down

Putting nut on
• Remove flare nuts attached to indoor and outdoor unit, then
put them on pipe/tube having completed burr removal.
(not possible to put them on after flaring work)
Flare nut

Copper tube

Flaring work
• Carry out flaring work using flaring tool as shown below.
• Firmly hold copper pipe in a die in the dimension shown in the
table above.

inch
1/4
3/8

A
mm
0~0.5
0~0.5

Bar

Handle

"A"

Outside diameter
mm
Ø6.35
Ø9.52

Bar
Yoke
Cone

Copper pipe
Clamp handle

Red arrow mark

Service Manual 21

Flaring Work and Connection of Piping
Check
1. Compare the flared work with the figure by.

Smooth all round
Inside is shiny without scratches

2. If a flared section is defective, cut it off and do flaring work
again.

= Improper flaring =

Even length
all round

Inclined Surface Cracked Uneven
damaged
thickness

Connecting the Piping
Indoor
1. Prepare the indoor unit's piping and drain hose for installation through the wall.
2. Remove the plastic tubing retainer(see the illustration by)
and pull the tubing and drain hose away from chassis.
3. Replace only the plastic tubing holder 1, not the holder 2 in
the original position.

For right rear piping
1. Route the indoor tubing and the drain hose in the direction
of rear right.
2. Insert the connecting cable into the indoor unit from the outdoor unit through the piping hole.
• Do not connect the cable to the indoor unit.
• Make a small loop with the cable for easy connection later.

Drain hose

3. Tape the tubing, drain hose, and the connecting cable. Be
sure that the drain hose is located at the lowest side of the
bundle. Locating at the uper side can cause drain pan to
overflow inside the unit.

If the drain hose is routed inside the room, insulate the hose
with an insulation material* so that dripping from "sweating"(condensation) will not damage furniture or floors.
*Foamed polyethylene or equivalent is recommended.

Drain hose

Tape
Connecting
pipe
Drain hose

Connecting cable

Connecting
cable

Loop

Gas side piping
Liquid side piping

Drain hose

22 Multi type Air Conditioner

Flaring Work and Connection of Piping
4. Indoor unit installation
Hook the indoor unit onto the upper portion of the installation plate.(Engage the two hooks of the rear top of the
indoor unit with the upper edge of the installation plate.)
Ensure that the hooks are properly seated on the installation plate by moving it left and right.

Connecting
cable

Drain hose

Press the lower left and right sides of the unit against the
installation plate until the hooks engage into their
slots(clicking sound).
Connecting the piping to the indoor unit and drain hose
to drain pipe.
1. Align the center of the pipes and sufficiently tighten the
flare nut by hand.
2. Tighten the flare nut with a wrench.
Outside diameter
mm
inch
Ø6.35
1/4
Ø9.52
3/8

Indoor unit tubing

Flare nut

Torque
kg.m
1.8
4.2

3. When extending the drain hose at the indoor unit, install
the drain pipe.

Pipes

Open-end wrench (fixed)
Flare nut
Wrench

Connection pipe

Indoor unit tubing

Drain pipe

Wrap the insulation material around the connecting portion.

Indoor unit drain hose
Adhesive

1. Overlap the connection pipe insulation material and the
indoor unit pipe insulation material. Bind them together
with vinyl tape so that there may be no gap.

Vinyl tape(narrow)

Plastic bands Insulation material

2. Wrap the area which accommodates the rear piping housing section with vinyl tape.

Indoor unit pipe

Connection pipe

3. Bundle the piping and drain hose together by wrapping
them with vinyl tape for enough to cover where they fit into
the rear piping housing section.

Wrap with vinyl tape
Vinyl tape (wide)
Connecting cable
Pipe
Vinyl tape(narrow)
Wrap with vinyl tape
Pipe

Vinyl tape(wide)
Drain hose

Service Manual 23

Flaring Work and Connection of Piping
For left rear piping
1. Route the indoor tubing and the drain hose to the required
piping hole position.

2. Insert the piping, drain hose, and the connecting cable into
the piping hole.

Connecting
cable

3. Insert the connecting cable into the indoor unit.
• Don't connect the cable to the indoor unit.
• Make a small loop with the cable for easy connection
later.

Drain pipe

4. Tape the drain hose and the connecting cables.

5. Indoor unit installation
• Hang the indoor unit from the hooks at the top of the
installation plate.
• Insert the spacer etc. between the indoor unit and the
installation plate and separate the bottom of the indoor
unit from the wall.

Indoor unit
Spacer
Installation plate
8cm

Connecting the piping to the indoor unit and the drain
hose to drain pipe.
1. Align the center of the pipes and sufficiently tighten the
flare nut by hand.
Indoor unit tubing

2. Tighten the flare nut with a wrench.
Outside diameter
mm
inch
Ø6.35
1/4
Ø9.52
3/8

Flare nut

Torque
kg.m
1.8
4.2

Pipes

Open-end wrench (fixed)
Flare nut
Wrench

3. When extending the drain hose at the indoor unit, install
the drain pipe.

Connection pipe

Indoor unit tubing

Drain hose

Indoor unit drain hose
Adhesive

24 Multi type Air Conditioner

Vinyl tape (narrow)

Flaring Work and Connection of Piping
Wrap the insulation material around the connecting portion.
1. Overlap the connection pipe heat insulation and the indoor
unit pipe heat insulation material. Bind them together with
vinyl tape so that there may be no gap.

Plastic bands Insulation material

2. Wrap the area which accommodates the rear piping housing section with vinyl tape.

Indoor
unit piping

Connection
pipe
Vinyl tape
(wide)

Wrap with vinyl tape
Pipe
Vinyl tape(narrow)

Connecting cable

3. Bundle the piping and drain hose together by wrapping
them with cloth tape over the range within which they fit
into the rear piping housing section.

Pipe
Drain hose
Vinyl tape(narrow)

Wrap with
vinyl tape(wide)

Reroute the pipings and the drain hose across the back
of the chassis.

Indoor unit installation
1. Remove the spacer.
2. Ensure that the hooks are properly seated on the installation plate by moving it left and right.
3. Press the lower left and right sides of the unit against the
installation plate until the hooks engage into their
slots(clicking sound).

Piping for
passage through
piping hole

Connecting
cable

Drain hose

Service Manual 25

Flaring Work and Connection of Piping
■ Panel Assembly(Art Cool Type only)
1. First, Check the side cover assembly exactly, Fix
power cord in the bottom groove of cover side
left.

2. Assemble connecting lead wire with controller
and first fix the upper part of panel front, then
match the lower part of panel front

Panel Front
Connector

3. Drive two screws.

26 Multi type Air Conditioner

Flaring Work and Connection of Piping

Installation Information. For left piping. Follow the instruction below.

Good case
• Press on the upper side of clamp and unfold the tubing to downward slowly.

Bad case
• Following bending type from right to left may cause damage to the tubing.

Service Manual 27

Flaring Work and Connection of Piping
REMOTE CONTROL PREPARATION(OPTIONAL)
HOW TO MOUNT ONTO A WALL

HOW TO INSERT BATTERIES
Remove the battery cover from the remote controller.
• Slide the cover according to the arrow direction.
Insert the two batteries.
• Be sure that the (+) and (-) directions are correct.
• Be sure that both batteries are new.
Re-attach the cover.
• Slide it back into position.

28 Multi type Air Conditioner

• Do not use rechargeable batteries,
such batteries differ from standard dry
cells in shape, dimensions, and performance.
• Romove the batteries from the remote
controller if the air conditioner is not
going to be used for some long time.

Flaring Work and Connection of Piping
Outdoor
Align the center of the pipings and sufficiently tighten the flare
nut by hand.

Finally, tighten the flare nut with torque wrench until the
wrench clicks.

Outdoor unit

• When tightening the flare nut with torque wrench, ensure
the direction for tightening follows the arrow on the wrench.

Outside diameter
mm
inch
Ø6.35
1/4
Ø9.52
3/8

Torque
kg.m
1.8
4.2

A-UNIT
Gas side piping
B-UNIT
Liquid side piping

Torque wrench

Service Manual 29

Connecting the Cable between Indoor Unit and Outdoor Unit

Connecting the Cable between Indoor Unit and Outdoor Unit
Connect the cable to the Indoor unit.
Connect the cable to the indoor unit by connecting the wires to the terminals on the control board individually
according to the outdoor unit connection. (Ensure that the color of the wires of the outdoor unit and the terminal No. are
the same as those of the indoor unit.)
The earth wire should be longer than the common wires.
The circuit diagram is not subject to change without notice.
When installing, refer to the electrical diagram behind the front panel of Indoor Unit.
The wiring for the outdoor unit can be found on the inside of the Outdoor Unit control cover.
RECOMMAND:
• The circuit diagram is not subject to change without notice.
• Be sure to connect wires according to the wiring diagram.
• Connect the wires firmly, so that not to be pulled out easily.
• Connect the wires according to color codes by referring to the wiring diagram.
RECOMMAND: Provide a circuit breaker
between power source and the outdoor
unit as shown below.

Main power source

Circuit Breaker
Use a circuit breaker
or time delay fuse.

Air
Conditioner

RECOMMAND: The power cord connected to the outdoor unit should be complied with the following
specifications (ETL recognized and CSA certified).
AWG14

Line voltage (208~230V)
GN

/YL
20

The power connecting cable connected to the indoor and outdoor unit should be complied with the
following specifications (ETL recognized and CSA certified).
AWG18

Low voltage (below 40V)

/YL
20

RECOMMAND: When using the separate wire as the power cord, please fix the separate wire into the
control box panel by using tie wrap as the fixture.

30 Multi type Air Conditioner

Connecting the Cable between Indoor Unit and Outdoor Unit

Connect the cable to the Outdoor unit.
1. Remove the cover control from the unit by loosening the
screw.
Connect the wires to the terminals on the control board
individually as the following.
2. Secure the cable onto the control board with the holder
(clamper).
3. Refix the cover control to the original position with the
screw.

Outdoor unit
Terminal block
Over 5mm
Holder for
power supply
cord
Power supply
cable

24k Outdoor side
A-UNIT
1

B-UNIT

Cover control
Connecting
cable

Connecting cable(Low voltage)

L
1

Terminal BLOCK

Indoor A-UNIT

1
Power Source
208/230V AC
(High voltage)

Terminal BLOCK

Indoor B-UNIT

NOTICE :
1. Separately wire the high and low voltage line.

2. Use heat-proof electrical wiring capable of withstanding temperature up to 75°C(167°F).
3. Use outdoor and waterproof Connecting
connection
cable
rated more than 300V for the connection between indoor and outdoor unit.
cable(Low
voltage)
(For example, Type SJO-WA)
WARNING:
• Be sure to comply with local codes while running the wire from the indoor unit to the outdoor unit(size of
wire and wiring method, etc).
• Every wire must be connected firmly.
• No wire should be allowed to touch refrigerant tubing, the compressor or any moving parts.

Service Manual 31

Connecting the Cable between Indoor Unit and Outdoor Unit

Connection method of the connecting cable(Example)
(1) Remove two-caps on the conduit panel.
(2) Make a hole appropriate for the passage of connection cable
through on cap by tool.
(for low voltage line)
(3) Pass the connecting cable through the hole.
(4) Properly connect the cable on the terminal block.
(5) Fix the connection cable with cord clamp provided on the unit
not to have strain at the terminal when the connection cable is
pulled outside up to a 35 pound weight.
(6) Wind the vinyl tape round the connecting cable for sealing
between the surface of the connection cable and cap.
(7)Finally, Fix the cap to the conduit panel.
WARNING: Loose wiring may cause the terminal to overheat or result in unit malfunction. A
fire hazard may also exist. Therefore, be sure
all wiring is tightly connected.

Terminal
block

Cap(Reuse)

Lock nut

Hole
(for low voltage line)
Cap(Remove)
Taping
(for sealing)
Power supply line
(1ø, 230/208V)

When connecting each power wire to the corresponding terminal,
follow instructions "How to connect wiring to the terminals" and
fasten the wire tightly with the fixing screw of the terminal plate.

For strand wiring
(1) Cut the wire end with a wire cutter or wire-cutting pliers,
then strip the insulation to expose the strand wiring about
10mm(3/8").
(2) Using a screwdriver, remove the terminal screw(s) on the
terminal plate.
(3) Using a round terminal fastener or pliers, securely clamp
each stripped wire end with a round terminal.
(4) Position the round terminal wire, and replace and tighten
the terminal screw using a screwdriver.

Conduit panel

High voltage
Strand wire

Round
terminal

Low voltage
Loosening the
terminal block
screw

Connecting cable

32 Multi type Air Conditioner

Low voltage line
(connecting cable)

Strip 10mm(3/8")

How to connect wiring to the terminals

Cord clamp

Fastening the
wire tightly

Connecting the Cable between Indoor Unit and Outdoor Unit
CAUTION: Provide a circuit breaker between power source and the unit as shown
below.
Main power source

Air
Conditioner

Circuit Breaker
Use a circuit
breaker or time
delay fuse.

Model
24k

Power source Fuse or breaker
Capacity
1Ø, 230/208V

25A

Connect the cable to the indoor unit
1. Connect the wires to the terminals on the control board
individually according to the outdoor unit connection.
• Ensure that the color of the wires of outdoor unit and the
terminal No. are the same as those of indoor unit respectively.

Connecting cable

2. Attach the Grille onto the cabinet.
• Grasp the lower left and right side of the Grille and
engage four tabs on the top inside edge of the chassis.
• Press the Grille toward the chassis until it will be back into
place.

Service Manual 33

Checking the Drainage, Forming the Pipings and Long Pipe Setting

Checking the Drainage, Forming the Pipings and Long Pipe Setting
Checking the drainage
To check the drainage.
1. Pour a glass of water on the evaporator.
2. Ensure the water flows through the drain hose of the
indoor unit without any leakage and goes out the drain exit.

Drain piping
1. The drain hose should point downward for easy drain flow.
Downward slope

2. Do not make drain piping.

Accumulated
drain water
Air

Do not raise

Water
leakage

Waving

34 Multi type Air Conditioner

Tip of drain hose
dipped in water
Water
leakage

Ditch

Less than
50mm gap

Checking the Drainage, Forming the Pipings and Long Pipe Setting

Forming the piping
Form the piping by wrapping the connecting portion of the indoor unit with
insulation material and secure it with
two kinds of vinyl tape.

Seal a small
opening around
the pipings with
gum type sealer.

Taping

• If you want to connect an additional drain hose, the end
of the drain outlet should be routed above the ground.
Secure the drain hose appropriately.

Drain hose

Plastic
band

Connecting
cable

In cases where the outdoor unit is
installed below the indoor unit perform
the following.
1. Tape the piping, drain hose and connecting cable from
down to up.
2. Secure the tapped piping along the exterior wall using
saddle or equivalent.

In cases where the Outdoor unit is
installed above the Indoor unit perform
the following.
1. Tape the piping and connecting cable from down to up.
2. Secure the taped piping along the exterior wall. Form a
trap to prevent water entering the room.
3. Fix the piping onto the wall by saddle or equivalent.

Pipings

Power supply
cord

• Trap is required to prevent water from entering
into electrical parts.

Seal a small opening
around the pipings
with gum type sealer.
Trap

Trap

Service Manual 35

Air Purging and Evacuation

Air Purging and Evacuation
Air and moisture remaining in the refrigerant system have undesirable effects as indicated below.
1. Pressure in the system rises.
2. Operating current rises.
3. Cooling(or heating) efficiency drops.
4. Moisture in the refrigerant circuit may freeze and block capillary tubing.
5. Water may lead to corrosion of parts in the refrigeration system.
Therefore, the indoor/outdoor unit and connecting tube must be checked for leak tight, and vacuumed to remove incondensible gas and moisture in the system.

Checking method
Preparation
• Check that each tube(both liquid and gas side tubes) between
the indoor and outdoor units have been properly connected and
all wiring for the test run has been completed. Remove the service valve caps from both the gas and the liquid side on the outdoor unit. Check that both the liquid and the gas side service
valves on the outdoor unit are kept closed at this stage.

1. Do a leakage test of all joints of the tubing(both indoor and
outdoor) and both gas and liquid side service valves.
Bubbles indicate a leak. Be sure to wipe off the soap with a
clean cloth.
2. After the system is found to be free of leaks, relieve the
nitrogen pressure by loosening the charge hose connector
at the nitrogen cylinder. When the system pressure is
reduced to normal, disconnect the hose from the cylinder.

Leakage test
• Connect the manifold valve(with pressure gauges) and dry nitrogen gas cylinder to this service port with charge hoses.

CAUTION: Be sure to use a manifold
valve for leak testing.
The high side manifold valve must always
be kept closed.

Indoor unit

Outdoor unit

• Pressurize the system to no more than 150 P.S.I.G. with dry
nitrogen gas and close the cylinder valve when the gauge
reading reached 150 P.S.I.G. Next, test for leaks with liquid
soap.

CAUTION: To avoid nitrogen entering the
refrigerant system in a liquid state, the top
of the cylinder must be higher than its bottom
when you pressurize the system. Usually, the
cylinder is used in a vertical standing position.
: Leakage test shoud be done for each indoor
unit connection set, separately.

Manifold valve
Pressure
gauge

Charge hose

NOTICE

36 Multi type Air Conditioner

Nitrogen gas
cylinder(in vertical
standing position)

Checking the Drainage, Forming the Pipings and Long Pipe Setting

Evacuation
1. Connect the charge hose end described in the preceding
steps to the vacuum pump to evacuate the tubing and
indoor unit.
Confirm the "Lo" knob of the manifold valve is open. Then,
run the vacuum pump.
The operation time for evacuation varies with tubing length
and capacity of the pump. The following table shows the
time required for evacuation.
Required time for evacuation when 30 gal/h vacuum
pump is used
If tubing length is less
than 10m (33 ft)
10 min. or more

Indoor unit

Outdoor unit

If tubing length is longer
than 10m (33 ft)
15 min. or more

2. When the desired vacuum is reached, close the "Lo" knob
of the manifold valve and stop the vacuum pump.

Finishing the job
1. With a service valve wrench, turn the valve stem of liquid
side valve counter-clockwise to fully open the valve.
2. Turn the valve stem of gas side valve counter-clockwise to
fully open the valve.
3. Loosen the charge hose connected to the gas side service
port slightly to release the pressure, then remove the hose.
4. Replace the flare nut and its bonnet on the gas side service port and fasten the flare nut securely with an
adjustable wrench. This process is very important to prevent leakage from the system.

Manifold valve
Pressure
gauge

Open

5. Replace the valve caps at both gas and liquid side service
valves and fasten them tight.
This completes air purging with a vacuum pump.
The air conditioner is now ready for test running.

Vacuum pump

NOTICE

: Repeat evacuation procedure for each indoor
unit.

Service Manual 37

Charging

Charging
■ Each outdoor unit is factory charged (nameplate charge) for the evaporator as well as a 7.5m(25ft) line set for each indoor
line.
Any time total line set is used either shorter or longer then the nominal 22.5m(75ft: for tri-zone) line set length the refrigerant
charge has to be adjusted.
■ Whether the line set is made shorter or longer you must adjust the charge based on how many ft of tubing are either added
or removed based on 20g(0.22oz) of R-410A per meter(foot).

Max Elevation
Max elevation
Max total length
Max length of
Min length of between each indoor
between indoor
Capacity (Btu/h)
of all pipes
each pipe (A/B) each pipe (A/B) unit and outdoor unit
units (h2)
(A+B)
(h1)
24k

30m(100ft)

15m(50ft)

3m(10ft)

7.5m(25ft)

Additional
Refrigerant
20g/m(0.22oz/ft)

Example: A 80ft line set is used for tri - zone 5 additional ft X 0.22 ounces per foot= add 1.1 ounces of R-410A
Important:
If you are ever uncertain of the unit charge, reclaim, evacuate and weigh in the correct charge using the unit nameplate charge
adjusting for line sets longer or shorter than 7.5m(25ft) for each indoor unit.

38 Multi type Air Conditioner

Test Running

Test Running
Split, Art Cool Type
1. Check that all tubing and wiring have been properly connected.
2. Check that the gas and liquid side service valves are
fully open.
1) Prepare remote controller
Remove the battery cover by pulling it according to
the arrow direction.
Insert new batteries making sure that the (+) and (–)
of battery are installed correctly.
Reattach the cover by pushing it back into position.

Bolt

Tubing connection

4) Evaluation of the performance
Operate unit for 15~20 minutes, then check the system
refrigerant charge:
1. Measure the pressure of the gas side service valve.
2. Measure the temperature of the intake and discharge of
air.
3. Ensure the difference between the intake temperature
and the discharge is more than 8°C(46°F) (Cooling) or
reversely (Heating).

NOTE:
• Use 2 AAA(1.5volt) batteries. Do not use rechargeable
batteries.
• Remove the batteries from the remote controller if the system is not going to be used for a long time.

ambient
Refrigerant Outside
TEMP.
R-410A

35°C (95°F) 8.5~9.5kg/cm2G(120~135 P.S.I.G.)

2) Precautions in test run
■ The initial power supply must provide at least 90% of
the rated voltage.
Otherwise, the air conditioner should not be operated.
■ For test run, carry out the cooling operation firstly
even during heating season. If heating operation is
carried out firstly, it leads to the trouble of compressor. Then attention must be paid.
■ Carry out the test run more than 5 minutes without
fail. (Test run will be cancelled 18 minutes later automatically)
■ The test run is started by pressing timer cancel button
five times continuously. (Room type)
■ To cancel the test run, press any button.

The pressure of the gas side
service valve.

Intake temperature

Discharge air

Discharge
temperature
Intake temperature
Discharge air

3) Settlement of outdoor unit
■ Anchor the outdoor unit with a bolt and nut(ø10mm)
tightly and horizontally on a concrete or rigid mount.
■ When installing on the wall, roof or rooftop, anchor the
mounting base securely with a nail or wire assuming the
influence of wind and earthquake.
■ In the case when the vibration of the unit is conveyed to
the hose, secure the unit with an anti-vibration rubber.

Discharge
temperature

Service Manual 39

Operation

Operation
Function of control
1. MAIN UNIT FUNCTION
• DISPLAY
Operation Indicator
• On while in appliance operation, off while in appliance pause
• Flashing while in disconnection or short in Thermistor (3 sec off / 0.5 sec on)
Sleep Timer Indicator
• On while in sleep timer mode, off when sleep timer cancel or appliance operation pause
Timer Indicator
• On while in timer mode (on/off), off when timer mode is completed or canceled
Defrost Indicator
• Off except when hot start during heating mode operation or while in defrost control

■ Cooling Mode Operation
• When the intake air temperature reaches 0.5°C(32.9°F) below the setting temp, the compressor and the outdoor
fan stop.
• When it reaches 0.5°C(32.9°F) above the setting temp, they start to operate again.
Compressor ON Temp
➲ Setting Temp+0.5°C(32.9°F)
Compressor OFF Temp
➲ Setting Temp-0.5°C(31.1°F)
• While in compressor running, operating with the airflow speed set by the remote control. While compressor is
off fan operates at low speed regardless of the setting.

■ Soft Dry Operation Mode
• 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.
26°C(78.8°F) ≤ Intake Air Temp
➲ 25°C(77°F)
24°C(75.2°F) ≤ Intake Intake Air Temp<26°C(78.8°F)
➲ Intake Air Temp-1°C(30.2°F)
18°C(64.4°F) ≤ Intake Intake Air Temp<24°C(75.2°F)
➲ Intake Air Temp-0.5°C(31.1°F)
Intake Air Temp<18°C(64.4°F)
➲ 18°C(64.4°F)
• While compressor off, the indoor fan repeats low airflow speed and stop.
• While the intake air temp is between compressor on temp. and compressor off temp., 10-min dehumidification
operation and 4-min compressor off repeat.
Compressor ON Temp.
➲ Setting Temp+0.5°C(32.9°F)
Compressor OFF Temp. ➲ Setting Temp-0.5°C(31.1°F)
• In 10-min dehumidification operation, the indoor fan operates with the low airflow speed.

■ Heating Mode Operation
• When the intake air temp reaches +3°(37.4°F)…above the setting temp, the compressor is turned off. When
below the setting temp, the compressor is turned on.
Compressor ON Temp.
➲ Setting Temp.
Compressor OFF Temp. ➲ Setting Temp.+3°C(37.4°F)
• While compressor on, the indoor fan is off when the indoor pipe temp. is below 20°C(68°F), when above
27°C(80.6°F) , it operates with the low or setting speed. When the indoor pipe temp is between 20°C(68°F) and

40 Multi type Air Conditioner

Operation
27°C(80.6°F), it operates with Super-Low(while in sleep mode, with the medium airflow speed).
• While compressor off, the indoor fan is off when the indoor pipe temp is below 33°C(91.4°F), when above
35°C(95°F) , it operates with the low airflow speed.
• While in defrost control, the indoor is outdoor fans are turned off.

■ Defrost Control(Heating)
• Defrost operation is controlled by timer and sensing temperature of outdoor pipe.
• The first defrost starts only when the outdoor pipe temperature falls below -6°C(21.2°F) after 35 minutes
passed from starting of heating operation and more than 4 minutes operation of compressor.
• Defrost ends after 12 minutes passed from starting of defrost operation when the outdoor pipe temperature
rises over 15°C(59°F) even before 12 minutes.
• The second defrost starts only when the outdoor pipe temperature falls below -6°C(21.2°F) after 35 minutes
passed from ending of the first defrost and more than 4 minutes operation of compressor.

■ 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(75.2°F) ≤ Inatake Air Temp
➲ Fuzzy Operation for Cooling
21°C(69.8°F) ≤ Inatake Air Temp<24°C(75.2°F)
➲ Fuzzy Operation for Dehumidification
Inatake Air Temp<21°C(69.8°F)
➲ 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.
1) Fuzzy Operation for Cooling
• According to the setting temperature selected by Fuzzy rule, when the intake air temp is 0.5°C(32.9°F) or more
below the setting temp, the compressor is turned off. When 0.5°C(32.9°F) or more above the setting temp, the
compressor is turned on.
Compressor ON Temp
➲ Setting Temp +0.5°C(32.9°F)
Compressor OFF Temp
➲ Setting Temp + 0.5°C(32.9°F)
• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temp at that time.
26°C(78.8°F)≤ Intake Air Temp
➲ 25°C(77°F)
24°C(75.2°F)≤ Intake Air Temp<26°C(78.8°F)
➲ Intake Air Temp + 1°C(33.8°F)
22°C(71.6°F)≤ Intake Air Temp<24°C(75.2°F)
➲ Intake Air Temp + 0.5°C(32.9°F)
18°C(64.4°F)≤ Intake Air Temp<22°C(71.6°F)
➲ Intake Air Temp
Intake Air Temp<18°C(64.4°F)
➲ 18°C(64.4°F)
• 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.

Service Manual 41

Operation
2) Fuzzy Operation for Dehumidification
• According to the setting temperature selected by Fuzzy rule, when the intake air temp is 0.5°C(32.9°F) or more
below the setting temp, the compressor is turned off. When 0.5°C(32.9°F) or more above the setting temp, the
compressor is turned on.
Compressor ON Temp
➲ Setting Temp + 0.5°C(32.9°F)
Compressor OFF Temp
➲ Setting Temp+0.5°C(32.9°F)
• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temp at that time.
26°C(78.8°F) ≤ Intake Air Temp
➲ 25°C(77°F)
24°C(75.2°F) ≤ Intake Air Temp<26°C(78.8°F)
➲ Intake Air Temp+1°C(33.8°F)
22°C(71.6°F) ≤ Intake Air Temp<24°C(75.2°F)
➲ Intake Air Temp+0.5°C(32.9°F)
18°C(64.4°F) ≤ Intake Air Temp<22°C(71.6°F)
➲ Intake Air Temp
Intake Air Temp<18°C(64.4°F)
➲ 18°C(64.4°F)
• 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.
3) Fuzzy Operation for Heating
• According to the setting temperature selected by Fuzzy rule, when the intake air temp is 3°C(37.4°F) or more
above the setting temp, the compressor is turned off. When below the setting temp, the compressor is turned
on.
Compressor ON Temp
➲ Setting Temp
Compressor OFF Temp
➲ Setting Temp + 3°C(37.4°F)
• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temp at that time.
20°C(68°F)≤Intake Air Temp
➲ Intake Air Temp + 0.5°C(32.9°F)
Intake Air Temp<20°C(68°F)
➲ 20°C(68°F)
• 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 set to the high or the medium according to the
intake air temperature and the setting temperature.

■ Airflow Speed Selection
• The airflow speed of the indoor fan is set to high, medium, low, or power (auto) by the input of the airflow
speed selection key on the remote control.

■ On-Timer Operation
• When the set time is reached after the time is input by the remote control, the appliance starts to operate.
• The timer LED is on when the on-timer is input. It is off when the time set by the timer is reached.
• If the appliance is operating at the time set by the timer, the operation continues.
While in Fuzzy operation, the airflow speed of the indoor fan is automatically selected according to the temperature.

■ Off-Timer Operation
• When the set time is reached after the time is input by the remote control, the appliance stops operating.
• The timer LED is on when the off-timer is input. It is off when the time set by the timer is reached.

42 Multi type Air Conditioner

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

■ Off-Timer <=> On-Timer Operation

• When the set time is reached after the on/off time is input by the remote control, the on/off-timer operation is
carried out according to the set time.

■ Sleep Timer Operation
• When the sleep time is reached after <1,2,3,4,5,6,7,0(cancel) hr> is input by the remote control while in appliance operation, the operation of the appliance stops.
• While the appliance is on pause, the sleep timer mode cannot be input.
• While in cooling mode operation, 30 min later since the start of the sleep timer, the setting temperature
increases by 1°C(33.8°F). After another 30 min elapse, it increases by 1°C(33.8°F) again.
• When the sleep timer mode is input while in cooling cycle mode, the airflow speed of the indoor fan is set to
the low.
• When the sleep timer mode is input while in heating cycle mode, the airflow speed of the indoor fan is set to
the medium.

■ Chaos Swing Mode
• By the Chaos Swing key input, the upper/lower vane automatically operates with the Chaos Swing or they are
fixed to the desired direction.
• While in Chaos Swing mode, the angles of cooling and heating cycle operations are different.

■ Chaos Natural Wind Mode
• When the Chaos Natural Wind mode is 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.

■ 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(64.4°F).
• 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.

■ Auto Restarting Operation
• When the power is restored after a sudden power failure while in appliance operation, the mode before the
power failure is kept on the memory and the appliance automatically operates in the mode on the memory.

Service Manual 43

Operation
■ Forced Operation
• To operate the appliance by force in case that the remote control is lost, the forced operation selection switch
is on the main unit of the appliance to operate the appliance in the standard conditions.
• When the power is supplied while the slide switch is on the forced operation position, or when the slide switch
position is switched to the Auto Restarting (or test operation) position or switched from the remote control
position to the forced operation position while the power is on, the forced operation is carried out.
• When the slide switch position is switched from the forced operation position to the Auto Restarting position or
the remote control position, the forced operation is canceled and the appliance stops operating.
• In the forced operation mode, the indoor fan is operated at low speed for around 15 sec and then the operation condition is set according to the intake air temperature as follows.
24°C(75.2°F)≤Intake Air Temp
➲ Cooling Mode Operation, 22°C(71.6°F), High Speed
21°C(69.8°F)≤Intake Air Temp<24°C(75.2°F)
➲ Dehumidification Operation, 23°C(73.4°F), High Speed
Intake Air Temp<21°C(69.8°F)
➲ Heating Mode Operation, 24°C(75.2°F), High Speed

■ Buzzer Sounding Operation
• When the appliance-operation key is input by the remote control, the short "beep-beep-" sounds.
• When the appliance-pause key is input by the remote control, the long "beep—" sounds.

44 Multi type Air Conditioner

Operation

Function of Indoor Unit
Split Type Indoor Unit
Operation ON/OFF by Remote controlle
r
Sensing the Room Temperature
• Room temperature sensor. (THERMISTOR)
Room temperature control
• Maintains the room temperature in accordance with the Setting Temp.
Starting Current Control
• Indoor fan is delayed for 5 seconds at the starting.
Time Delay Safety Control
• Restarting is delayed for approx. 3 minutes.
Indoor Fan Speed Control
• High, Med, Low, Chaos, Jet Cool
Operation indication Lamps (LED)
On/Off

: Lights up during the system operation.

Sleep Mode : Lights up during Sleep Mode Auto operation.
Timer

: Lights up during Timer operation.

Defrost Mode : Lights up during Defrost Mode or Hot Start operation (Heat pump model only)
Outdoor unit : Lights up during outdoor unit operation.(Cooling model only)
operation
Desire temperature For cooling,dehumidification,heating modes it display Destired temperature
indicator
• Cooling
: 18°C~30°C(64°F~86°F) • AI : Auto Operation
• Dehumidification : 18°C~30°C(64°F~86°F) • Po : Jet Cool
• Heating
: 16~30°C(60°F~86°F)
• Lo : Test Mode
Plasma

: The function illustrates its dynamic mode by using a multiple lighting system. (Optional)

Soft Dry Operation Mode
• Intermittent operation of fan at low speed.

Deice (defrost) control (Heating)

Sleep Mode Auto Control
• The fan is switched to low(Cooling), med(Heating) speed.
• The unit will be stopped after 1, 2, 3, 4, 5, 6, 7 hours.
Natural Air Control by CHAOS Logic
• The fan is switched to intermittent or irregular operation
• The fan speed is automatically switched from high to low speed.
* Airflow Direction Control

• Both the indoor and outdoor fan
stops during deicing.
• Hot start after deice ends.
Hot-start Control (Heating)
• The indoor fan stops until the
evaporator piping temperature will
be reached at 27°C(80.6°F).

• The louver can be set at the desired position or swing
up and down automatically.(Model base)
"Wall Mounted Type is standard"
* Functions is dependent on model type.

Service Manual 45

Operation

Art Cool Type Indoor Unit
Operation ON/OFF by Remote controller
Sensing the Room Temperature
• Room temperature sensor. (THERMISTOR)
Room temperature control
• Maintains the room temperature in accordance with the Setting Temp.
Starting Current Control
• Indoor fan is delayed for 5 sec at the starting.
Time Delay Safety Control
• Restarting is inhibited for approx. 3 minutes.
Indoor Fan Speed Control
• High, Med, Low, CHAOS, JET COOL
Operation indication Lamps (LED)
On/Off

: Lights up during the system operation.

Sleep Mode

: Lights up during Sleep Mode Auto operation.

Timer

: Lights up during Timer operation.

Defrost Mode

: Lights up during Defrost Mode or
Hot Start operation.(Heat pump model only)

Outdoor unit
operation

: Lights up during outdoor unit operation.(Cooling model only)

Desire temperature For cooling,dehumidification,heating modes it display Destired temperature
indicator
• Cooling
: 18°C~30°C(64°F~86°F) • AI : Auto Operation
• Dehumidification : 18°C~30°C(64°F~86°F) • Po : Jet Cool
• Heating
: 16~30°C(60°F~86°F)
• Lo : Test Mode
PLASMA

: Indicate PLASMA purifier operation.

Soft Dry Operation Mode
• Intermittent operation of fan at low speed.
Sleep Mode Auto Control
• The fan is switched to low(Cooling), med(Heating) speed.
• The unit will be stopped after 1, 2, 3, 4, 5, 6, 7 hours.
Natural Air Control by CHAOS Logic
• The fan is switched to intermittent or irregular operation
• The fan speed is automatically switched from high to low speed.
Airflow Direction Control
• The louver can be set at the desired position or swing
up and down automatically.

46 Multi type Air Conditioner

PLASMA
• The function will be operated while in any
operation mode with selecting the function.
• The function is to be stopped while it is
operating with selecting the function.
Defrost(Deice) control (Heating)
• Both the indoor and outdoor fan stops during defrosting.
Hot-start Control (Heating)
• The indoor fan stops until the
evaporator pipe temperature will be reached
at 28°C(82.4°F).

Operation

Function of Outdoor Unit
Outdoor Unit
Two Comp algorithm
• Inverter Comp is first priority and then Constant Comp is turning on responding to load condtion.
Operating Step
• Compressor step varies considering condition such as room temp,outdoor temp, operating room
number,Temp gap between room temp and set temp and so on.
LEV Control
• LEV pulse is modulated to keep constant superheat or subcooling.
Out door Fan Control
• Outdoor fan operates at High or Off to respond to the load condition.
R/Valve Control(Heating Model Only)
• Convert R/Valve to change cooling to heating, heating to cooling.

Defrost Function
• After 45 min heating operation, check the defrost condition and if outdoor pipe temp is below 5°C(23°F) and released from deice operation in case outdoor pipe temp is over 12°C(53.6°F) or 9 min
cooing mode.
• To deice outdoor heat exchanger in low temp condtion, convert operating mode from heating to
Oil Return System
• In single(one) comp operation duration, another comp will operate for 30 seconds every 1 hours.

Comp Overload Protection
• To protect comp from being overload, protector will turn off the comp.
High Pressure Protction
• If cycle pressure is too high(around 36.7 kgf/cm2), it will turn off comp A

Service Manual 47

Operation

Remote Control Operation
The Remote Controller transmits the signals to the system.

Signal transmitter

START/STOP BUTTON
Operation starts when this button is pressed and stops when
the button is pressed again.

2 OPERATION MODE SELECTION BUTTON
Used to select the operation mode.

5
6

4
2
7
11
8
13

INDOOR FAN SPEED SELECTOR
Used to select fan speed in four steps
low, medium, high and CHAOS.

JET COOL
Used to start or stop the speed cooling/heating.
(Speed cooling/heating operates super high fan speed.)

6 CHAOS SWING BUTTON

Used to stop or start louver movement and set the desired
up/down airflow direction.

CANCEL
ON

OFF

9
16
12
17
18
15

SET
AUTO CLEAN

°C/°F

(Cooling Only)

ROOM TEMPERATURE
SETTING BUTTONS
Used to select the room temperature.

4
1
3

(Heat Pump)

ON/OFF TIMER BUTTONS
Used to set the time of starting and stopping operation.

8 TIME SETTING BUTTONS
Used to adjust the time.

9 TIMER SET/CANCEL BUTTON

Used to set the timer when the desired time is obtained and to cancel
the Timer operation.

Flip-up door
(opened)

Used to circulate the room air without cooling or heating.

12 ROOM TEMPERATURE CHECKING BUTTON

Cooling Operation

Used to check the room temperature.

13 PLASMA(OPTIONAL)

Auto Operation

Used to start or stop the plasma-purification function.

14 RESET BUTTON

Healthy Dehumidification Operation

Initialize remote controller.

15 2nd F Button

Heating Operation

), Heat Pump Model(

Used to set Sleep Mode Auto operation.

11 AIR CIRCULATION BUTTON

Operation Mode

• Cooling Model(

10 SLEEP MODE AUTO BUTTON

Used prior to using modes printed in blue at the bottom of buttons.

)

16 AUTO CLEAN

Used to set Auto Clean mode.
17 ˚C TO ˚F SWITCHING BUTTON
Used to switch temperature reading from Centigrade to Fahrenheit.

18 HORIZONTAL AIRFLOW DIRECTION CONTROL BUTTON (NOT ON
ALL MODELS)
Used to set the desired horizontal airflow direction.

48 Multi type Air Conditioner

Disassembly

Disassembly
Indoor Unit
Split Type Indoor Unit
Disconnect the unit from power supply before making any checks.
Be sure the power switch is set to “OFF”.

To remove the Grille from the Chassis.
• Set the up-and-down air discharge louver to open
position (horizontally) by finger pressure.
• Remove the securing screws.
• To remove the Grille, pull the lower left and right
side of the grille toward you (slightly tilted) and lift it
straight upward.

1. Before removing the control box, be sure to
take out the wire screwed at the other end.

Earth
Conductor

Service Manual 49

Disassembly
2. To remove the Control Box.
• Remove securing screws.
• Pull the control box out from the chassis
carefully.

Screw

3. To remove the Discharge Grille.
• Unhook the discharge grille and pull the
discharge grille out from the chassis carefully.

4. To remove the Evaporator.
• Remove 3 screws securing the evaporator(at the
left 2EA in the Eva Holder, at the right 1EA).

• When repair, do not damage the Caution label.

50 Multi type Air Conditioner

Disassembly
• Unhook the tab on the right inside of the chassis
at the same time, slightly pull the evaporator
toward you until the tab is clear of the slot.

5. To remove the Motor Cover
• Remove 2 securing screw.
• Pull the motor cover out from the chassis
carefully.

Motor cover

6. To remove the Cross-Flow Fan
• Loosen the screw securing the cross-flow fan to
the fan motor (do not remove).
• Lift up the right side of the cross-flow fan and the
fan motor, separate the fan motor from the
cross-flow fan.

Bearing

Cross-flow fan

• Remove the left end of the cross-flow fan from
the self-aligning bearing.

Service Manual 51

Disassembly
Art Cool Type Indoor Unit
CAUTION: Disconnect the unit from
power supply before making any
checks.
Be sure the power switch is set to
“OFF”.

1. To remove the Grille from the Chassis.
- Pull the grille bottom, the remove 2 securing screws.
- Lift the both lower parts of panel front.
- After pull down this panel a bit, separate connecting
wire with product.

2. To remove the Control Box.
- Before removing the control box, be sure to
disconnect the wires from PWB.
- Pull the cover control out from the control box
and disconnect other wires.
- Remove securing screws.
- Pull the control box out from the chassis carefully.

Panel Front
Connector

Step Motor Connectors
Sensor Connector

4Way/Fan Connector
Comp Connector
Power Connector
Power Connector
Comp Connector

52 Multi type Air Conditioner

Motor
Connector

Disassembly
3) To remove the Evaporator.
- Remove 4 screws securing the evaporator.
- Pull the evaporator out from the chassis carefully.

4) Before removing the Turbo Fan.
- Remove the securing screws from the chassis.
- Pull the pipe cover, top cover and the air guide.

Air Guide

Top Cover

Pipe Cover

5) To remove the Motor.
- Remove the securing bolt from the motor shaft.
- Pull the fan out from the motor shaft.
- Remove 4 screws securing motor mount from the
chassis and lift up the motor mount and the bracket.

Bracket

Turbo Fan

Bolt

Motor Mount

Service Manual 53

Schematic Diagram

Schematic Diagram
Electronic Control Device
1. Indoor Unit
1) Split Type

54 Multi type Air Conditioner

Schematic Diagram
2) Art Cool Type

a
f

4(f)
3(a)
1(g)

6(d)

9(b)

7(e)
8(c)

CN-D5

SUB PCB ASM

1
2
3
4

CN-D1(WH)
1
2
3
4
5
6

1
2
3
4
5
6
7
8

5
6
7
8

4
3

7
8

4
3

RD OR YL PK BL
1

2
3
4

1
1

CN-D2(WH)

2
1

9
10

CN-D1(WH)

12V

HVB PIN2

HVB

HVB PIN1

receiver

5V
C02L
220
10V

Q02C

Q03C

DC 5V

+ C01D
2200uF
35V

12V

HVB

9
8

R03G 220

2
3

IC02M
KID65004AF

C02M
103
digit 2

LED scan

RXD

CN-UD(BL)

STEPPING MOTOR

5 4 3 2 1

BL PK YL OR RD

5 4 3 2 1

0IMCRNE002M
uPD780023AGC

AVret

AVdd

RESET

Vss1

INTO

INT1

64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49

VssO
Vdd0

R81 1K

R81A 1K

C91
103

DC 5V

C01M
103

R90 1K

DC12V

R91
4.7K
7

OR5H
Hi

RXD
TXD

OR1H
F1

DC12V

OR3H OR2H
Low
F2

12V

44
43

47
46
45

42
41
40
39
38
37
36
35
34
33

OR4H
Med

R93 10K

R01E
1K

R24H

R02E 20

BZ01E

PKM13EPP-4002

R01L
5.1K

5V
R02L
1K

IC03M
KID65004AF

7
8

receiver

C01L
680pF
50V

3.6V

R02A 20K

C01A
0.01
25V

IC01A
KIA7036P
KSC7536

R02H
12.1K
1%

3
4
5

1
2

4
5

1
2

3
4
5

1
2

4
5

1
4

CN-LR1(WH)

12V

HVB PIN2

CN-TH1(WH)

CN-HVB(BL)

CN-LR2(WH)

HVB PIN1

OUTDOOR

R05H
10K

R04H
6.2K
1%

R21H~R26H
12.1K 1%

OSC01B
CST-8.00MTW

R01B
1M

R21H
R22H
R23H

R25H

E2 1K

E3 1K

2
4

CN-DC/DC(BL)

+ C07D
100uF
63V

C92
104,50V

R99
750
1/4W

R26H

POLY SW2
RXE250

POLY SW1
RXE250

FG2
4

IC9-2
KA393

R92 10K

OR6H
S-Hi

17 18 1920 21 22 23 24 25 26 27 28 29 30 31. 32

C81A
103

C81
103

12
13
14
15
16

4
5
6
7
8
9
10

IC01M
8 KID65004AF

7
6
5
4

11
12
13

5V
C03M
103

EE
PR
OM

FG1

FG2

DC12V
1

IC9-1
KA393

OJ01H

8
4

a
g

7
6
5
4

10
11
12
13

R02G 220

R04G 220

digit 1

R01G 220

R05G 220

C13H
103
50V

3
2

R95
10K

R06G 220

R11H
1K

Q01C

R07G 220

R12H
10K

OJ02H

R27H 20K

R28H 20K

TXD

R96
10K

R97
10K

FG1

INDOOR
FAN
MOTOR2

CN-MOTOR2(WH)

BL PK YL OR RD

12V

IC01D

DC12V

IC02D

CN-D1

CN-D2

2
1

4
3

2
1
CN-D6
CN-D3

2
1

7
8

CN-CON(WH)

CN-12V(WH)

7812

C02D
104
50V

INDOOR

FAN
MOTOR1

CN-MOTOR1(WH)

BL PK YL OR RD

DC5V

7805

C04D
+ C03D
104
470uF
50V
25V

AVss

RD OR YL PK BL

d
8

9
10

12
13

12
13
14

14
CN-MAIN

+ C05D
470uF
25V

STEPPING MOTOR

5
Digit1

C04L
0.01
25V

TEST
KEY

STEPPING MOTOR

LED2
SLEEP

LED4
DEFROST

LED3
TIMER

LED1
ON/OFF

10
Digit2

GND

DC 5V

Vcc

Vout

RECEIVER

DISPLAY

C03L
220
10V

C06D
103

AVdd1

STEP MOTOR
L/R1

STEP MOTOR
L/R2

HVB ASSY

ROOM-TH

PIPE-TH

Service Manual 55

56 Multi type Air Conditioner

CN-JIG

OUT_TH

OUT_PIPE

CN-TH2

SUCTION

DISCHARGE

CN-TH1

4
3
2
1

1
2
3
4

4
3
2
1

1
2
3
4

56K

DC 5V

R03T

R04T

R02T

R01T

10K

C01H-C04H : 103

R05H-R20H
(R05H,R06H,R07H:6.2K 1%)
(ETC: 12.1K 1%)

DC 5V

JIG_RX

JIG_TX

DC 5V

IC01A

7036P

1
3
C02A
10
50V

R03A,100

R02A,4.7K

+
R01B,1M

JIG_TX

JIG_RX

PWM(C)

PWM(B)

PWM(A)

OSC01B
CST-8.00MGW

C01A
0.01
25V

R01A,1K

OR2H,OR7H,OR10H:91K,OR3H-4H,OR8H-9H,OR11H-12H:15K(ETC:20K)

R04H,1K

R03H,1K

R02H,1K

R01H,1K

Vss

Xout

Xin

RESET

P22

P21

P54

P53

P52

P60

P61

P62

P63

P64

P65

P66

P67

P70

P71

P72

P73

P74

P75

P76

P77

TEST

VSS

AVDD

VDD

MICOM

TMP87CM41F

P20

P33

P32

P31

P30

P41

P40

P37

P36

P35

P34

P13

P12

P11

P10

P07

P06

P05

P04

P03

P02

P01

P00

P51

P50

P47

P46

P45

P44

P43

P42

R01F,1K

R04G,10K

R03G,10K

R02G,10K

R01G,10K

Q01Z
KRA107M

DC 5V

L4(C)

L3(C)

L2(B)

L1(A)

R02F,10K

RX(C)

TX(C)

RX(B)

TX(B)

RX(A)

TX(A)

SW01F

DC 5V

R01Z-R07Z : 4.7K

IC03M

IC02M

IC01M

RY-COMP(A)

RY-COMP(B)

RY-FAN(H)

RY-FAN(L)

RY-GAS

RY-LIQ

RY-4WAY

C52M
220
50V

C51M
220
50V

C50M
220
50V

CN-LEV(C)

CN-LEV(B)

CN-LEV(A)

DC 15V

Schematic Diagram

2. Outdoor Unit

4.7K

PWM(C)

4.7K

PWM(B)

4.7K

PWM(A)

C24M
100uf

C13M
100uf

C01M
100uf

R02M
9.1k
1%

R15M
9.1k
1%

R27M
9.1k
1%

R26M
10.2K
1%

Q07M
KRA101M

R14M
10.2K
1%

Q04M
KRA101M

R01M
10.2K
1%

21.5K

5
4

3
2

C25M
102
100V

6.04K

3
2

C14M
102
100V

4.3K

DC 5V

5
4

6.04K

3
2

C02M
102
100V

4.3K

DC 5V

5
4

6.04K

21.5K

4.3K

R03M
13K
1%

39.2K

R16M
13K
1%

39.2K

51.1K

R28M
13K
1%

35.7K

51.1K

35.7K

51.1K

35.7K

39.2K

51.1K

10K

R04S

13K

51.1K

10K

R04S

13K

51.1K

10K

R04S

13K

34K
3

34K

R31M
220
51.1K

23.2K

IC06M

R19M
220
51.1K

23.2K

8.06K

5.23K

R29M,2K,1%

2.94K

7
6

20K

C26M
100uF
25V

9
8

IC05M

R06M
220
51.1K

23.2K

8.06K

5.23K

R17M,2K,1%

2.94K

7
6

20K

34K

8.06K

5.23K

R04M,2K,1%

2.94K

7
6

C15M
100uF
25V

9
8

20K

C03M
100uF
25V

9
8

R33M
100K

R32M
10K

R21M
100K

R20M
10K

R08M
100K

R07M
10K

Q08M
2SD2220

C27M
473K
100V

Q05M
2SD2220

C16M
473K
100V

Q02M
2SD2220

C04M
473K
100V

C28M
680uF
63V

C17M
680uF
63V

C05M
680uF
63V

L09M
L10M

L05M
L06M

C31M
103K
100V

R22M
1.5K

R34M
1.5K

D05M
FMX12S

C29M
821K
1KV

C21M
103K
100V

R09M
1.5K

D03M
FMX12S

C18M
821K
1KV

C09M
103K
100V

C06M
821K
1KV

C30M
472/250V

L11M
L12M

C19M
472/250V

L07M
L08M

C07M
472/250V

S/W TRANS6

S/W TRANS5

S/W TRANS4

S/W TRANS3

S/W TRANS2

Vm(A)

MT 15V

ZD01M
12V

Vm(B)

MT 15V

ZD02M
12V

Q09M

Vm(C)

MT 15V

ZD03M
12V

R35M
68K
3W
D06M
ERB-44-08

Q06M

R23M
68K
3W
D04M
ERB-44-08

Q03M

R10M
68K
3W
D02M
ERB-44-08

R36M
200

R37M
30,1W

C32M
51.1K

C33M
222K
1KV

R24M
200

R25M
30,1W

C22M
51.1K

C23M
222K
1KV

R12M
200

R13M
30,1W

C10M
51.1K

C11M
222K
1KV

+
R11M
560K
1/2W

NTC
DKS-10D-22

C12M
330UF
450V

BD01M
D15XB60

DC 5V

DC 15V

MT 15V

DC 0V

DC 310V

C03D
220uF
10V

C05D
220uF
35V

50V

C02D
470uF
25V

C09J~C10J

C06D
103
50V

7805

IC04D

2K
1/2W

R02D

C08J

L02D
12uH

R13K

R09K

R01K

C07D
103

50V

C08D
103

RX(C)

TX(C)

RX(B)

TX(B)

RX(A)

TX(A)

DC 5V

DC 15V

1uF

S/W TRANS1

222*2

L03M
L04M

D01D
1N4937

9mH

NF02J

C06J~C07J
C05J

C01D
1000UF
35V

L01D
12uH

C04D
470UF
35V

102

C03K

R14K

102

C02K

R10K

102

C01K

R03K

GND

R01J C04J

1mH

NF01J

102M

C10D

D202

PC201

R201

3
2

IC03K

3
2

IC02K

3
2

IC01K

D201

OUT

GND

OUT

R202

10K

R04K

10K

R02K

D01M
FMX12S

472*3

L01M
L02M

1uF

IC04M

8
5
6

5
6

C101

C102

TNY
268

R102

PC201

GND

D101

R101

10K

R16K

R15K

10K

R12K

R11K

10K

R07K

10K

R06K

R05K

C03J

302

D01J

uRM1515-2B

u-POWER MODULE

10K

R08K

ZNR01J~ZNR02J

1uF

DC 5V

561*2

Q01M
KRA101M

5
6

DC 0V

DC 310V

RY-FAN(H)

RY-FAN(L)

RY-GAS

RY-LIQ

RY-4WAY

COM(C)

COM(B)

COM(A)

Vm(C)

DC 15V

NF01M

NF02M

NF03M

NF04M

NF05M

ZNR01J
INR14D471K
SVC561D-14A

FUSE
250V/T5A

RY-COMP(A)

RY-COMP(B)

COM(C)

Vm(B)

DC 15V

COM(B)

Vm(A)

DC 15V

COM(A)

2
3

1
2

2
3

NEUTRAL
CN-POWER

LIVE1

LIVE2

COMP A

COMP B

FAN HI

FAN LOW

CN-FAN

HOT GAS

LIQUID

4WAY

CN-COM3

CN-COM2

CN-COM1

Schematic Diagram

Service Manual 57

Schematic Diagram

Wiring Diagram
1. Room Type Indoor Unit -S4/SE chassis

2. Art Cool Type Indoor Unit

3. Outdoor Unit
1. A2UH243FA0(LMU240HE)

2. A2UC243FA0(LMU240CE)

58 Multi type Air Conditioner

Schematic Diagram

Components Locations
1. Indoor Unit
MAIN P.C.B ASM
1) Split Type

• TOP VIEW

PCB :6870A90409B
ASSY:6871A20771
6871A20782

• BOTTOM VIEW

Service Manual 59

Schematic Diagram
2) Art Cool Type
• TOP VIEW

• BOTTOM VIEW

60 Multi type Air Conditioner

Schematic Diagram
2. Display ASSEMBLY
1) Split Type (6871A20680)

2) Art Cool Type (6871A20462)

TOP VIEW

BOTTOM VIEW

Service Manual 61

Schematic Diagram

3. Outdoor Unit
1) Component side

62 Multi type Air Conditioner

Schematic Diagram
2) Solder side

Service Manual 63

Troubleshooting Guide

Troubleshooting Guide
Refrigeration Cycle Diagram
1. A2UH243FA0(LMU240HE)
R/Valve
5220AR3228E

Ø 9.52

strainer

Air
Sensor
S/W

Eva.
Sensor
C/V2

C/V1

Th2

Th1

Air
Sensor

A-Room

B-Room

Acc.

Cons.
Comp

(GK094K)

(GK141K)

Eva.
Sensor

LEV-B

Ø 6.35

Sensor

LEV-A
LEV 15RC
strainer

2. A2UC243FA0 (LMU240CE)

64 Multi type Air Conditioner

Troubleshooting Guide

Self-diagnosis Function
■ Error Indicator
• The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble.
• Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table.
• If more than two troubles occur simultaneously, primarily the highest trouble fo error code is expressed.
• After error occurrence, if error is released, error LED is also released simultaneously.
• To operate again on the occurrence of error code, be sure to turn off the power and then turn on.
• Having or not of error code is different from Model.

LED1

LED2

Indoor Error
Error code

Description

MPS Variable

LED1

LED2

Indoor Status

No Error

Indoor Room Thermistor Error

1 time

OFF

Indoor In-Piping Error

2 times

OFF

Communication Error between In and Out

5 times

OFF

Indoor Out-Piping Error

6 times

OFF

Differnt mode operation

7 times

OFF

Indoor fan motor locked error

1 times

OFF

Outdoor Error
Error code

Description

MPS Variable

LED1(Red)

LED2(Green) Indoor Status

D-Pipe High(Normal)

3 times

OFF

Outdoor Air Thermistor Error(Open/Short)

4 times

OFF

Cond Pipe Thermistor Error(Open/Short)

4 times

5 times

OFF

Const. D-Pipe Thermistor Error(Open/Short)

4 times

7 times

OFF

Capcity Error(High/Low)

5 times

1 times

OFF

Service Manual 65

Troubleshooting Guide

Cycle Troubleshooting Guide
Trouble analysis
1. Check temperature difference between intake and discharge air, and operating current.
Temp. difference
Current

: approx. 0°C(32°F)
: less than 80% of
rated current

All amount of refrigerant leaked out.
Check refrigeration cycle.

Temp. difference
Current

: approx. 8°C(46.4°F)
: less than 80% of
rated current

Refrigerant leakage
Clog of refrigeration cycle
Defective compressor

Temp. difference
Current

: less than 8°C(46.4°F)
: near the rated current

Excessive amount of refrigerant

Temp. difference

: over 8°C(46.4°F)

Normal

Temp. Difference

Operating Current

Notice:
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relatively higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger.
2. Check temperature and pressure of refrigeration cycle.
Suction pressure
(Compared with
the normal value)

Temperature
(Compared with
the normal value)

Cause of Trouble

Description

High

Defective compressor

Current is low.

Normal

Excessive amount of
refrigerant

High pressure does not quickly
rise at the beginning of operation.

Insufficient amount of
refrigerant(Leakage)
Clogging

Current is low.

Higher

Lower

Higher

Notice:
1. The suction pressure is usually 4.5~6.0 kg/cm G at normal condition.
2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with
putty.
2

66 Multi type Air Conditioner

Troubleshooting Guide

Electronic Parts Troubleshooting Guide
❇ Refer to electronic contorol device drawing & schematic diagram.

Trouble 1

The Product doesn’t operate at all.
Turn off the main power and wait until LED on outdoor PCB is off.

Turn on the main power again.

Does "Beeping" sound is made from the indoor unit?
NO

YES

Check the voltage of power(AC208V/AC230V, 60Hz).
• The voltage of main power.
• The voltage applied to the unit.
• The connecting method of Indoor/Outdoor connecting cable (each color)
• The P.W.B. Ass'y
(Fuse, Noise Filter, Power Transformer, IC01D, IC02D, etc.)

• Primarily, the operating condition of Micom is O.K.

• Check CN-DISP1

The operation check of the P.C.B. Ass'y
Specification

Procedure

Remedy

1) The input voltage of power transformer.

1) AC230V ± 30V
: Check the rated voltage

1) Replace
power transfomer.

2) The output voltage of power
transformer.

2) 15V ± 1.5V

2) Replace
power transfomer.

3) IC01D(7812)

3) DC12V

3) Replace IC01D.

4) IC02D(7805)

4) DC5V

4) Replace IC02D.

5) IC01A(KIA7036)

5) The voltage of micom pin 29
: DC4.5V↑

5) Replace IC01A.

Service Manual 67

Troubleshooting Guide

Trouble 2

Product doesn't operate with the remote controller.
Turn on main power.

While the compressor has been stopped, the compressor does not operate
owing to the delaying function for 3 minutes after stopped.

When the compressor stopped Indoor Fan is driven by a low speed.
At this point the wind speed is not controlled by the remote controller.
(When operated in the Sleeping Mode, the wind speed is set to the low speed as force.)

Caused by the remote controller.

Caused by other parts except
the remote controller

When the mark (
) is displayed in LCD
screen, replace battery.

Check the contact of CN-DISP 1 connector

When the detect switch (double key) inside the
remote controller door is fault, it is impossible to
operate temperature regulating(▲ / ▼) and wind
speed selecting.

Check DISP PWB Ass'y
-Voltage between CN1 ➀ - ➆ : DC +5V

Check the Display PWB Ass'y

68 Multi type Air Conditioner

• Check receiver ass'y

Troubleshooting Guide

Trouble 3

The Compressor/Outdoor Fan are don't operate
Turn on the main power.

Operate Cooling Mode by setting the disired temperature of the remote controller is less
than one of the Indoor temperature by 1°C at least.

When in air circulation mode, compressor/outdoor fan is stopped.

Check the sensor for Indoor temperature is attatched as close as to be effected by the
themperature of Heat Exchange (EVA.)

When the sensor circuit for Indoor temperature and connector are in bad connection or are
not engaged, Compressor/Outdoor fan is stopped.
• Check the related circuit of R01H(1K), R02H(1K), R03H(1K), R04H(1K), Micom(pin No. 74 ,
75 , 76 , 77 ).
• Check the Indoor temperature sensor is disconnected or not (about 10K at 25°C).

Check the Relay(RY-PWR, RY-START) for driving Compressor.
• Check the voltage between brown and blue cable of terminal to connect the Outdoor
(About AC208V / 230V).
• Check the related circuit of relay in Outdoor PCB Ass'y.
Check Point

Comp. ON

Between Micom(No. 50,51) and
GND

DC 5V

DC 0V

DC 1V↓

DC 12V

Between IC01M(No. 10) and
GND

Comp. OFF

Turn off main power.

Check the electrical wiring diagram of Outdoor side.
Check the open or short of connecting wires between Indoor and Outdoor.

Service Manual 69

Troubleshooting Guide

Trouble 4

When indoor Fan does not operate.

When indoor Fan does not operate.
Does the voltage of each terminals of CN-MOTOR CONNECTOR in
Indoor unit corresponds to values in the Table of page 69

Does the voltage of terminal of CN-DC/DC CONNECTOR in
Indoor unit corresponds to the values in the table of page 56

Do the voltage of terminal of
CN-DC/DC CONNECTOR in
Outdoor unit corresponds to the
values in the table of page 56
NO

Check the patterns and the
conditions of outdoor unit
PWB Assy's.

Check connecting condition of the CN-MOTOR CONNECTOR

Check the pattern and the
condition of Indoor unit PWB
Ass'y.

Check the interference of Indoor Fan.

Check the connecting condition and disconnection of
connecting wires between
Indoor and Outdoor unit.

Check the motor of Indoor Fan

S
YE

Indoor Fan may be stopped in the Soft Dry Mode(change to the Cooling Operation Mode).
Indoor Fan is to be stopped when Indoor pipe(coil) termperature is lower than 79°F.
(At that times, Defrost indicator is turned on)

70 Multi type Air Conditioner

Troubleshooting Guide

Trouble 5

When the louver does not operate.

When Vertical Louver does not operate.
• Confirm that the Vertical Louver is normally geared with the shaft of
Stepping Motor.
• If the regular torque is detected when rotating the Vertical Louver with
hands
Normal

• Check the connecting condition of CN-UP/DOWN Connector
• Check the soldering condition(on PWB) of CN-UP/DOWN Connector

Check the operating circuit of the Vertical Louver
• Confirm that there is DC +12V between pin (RED) of CN-UP/DOWN and
GND.
• Confirm that there is a soldering short at following terminals.
- Between 60 , 61 , 62 and 63 of MICOM
- Between 2 , 3 , 4 and 5 of IC01M
- Between 12 , 13 , 14 , 15 of IC01M
- Between 1 , 2 , 3 , 4 and 5 of CN-UP/DOWN

If there are no problems after above checks
• Confirm the assembly conditions that are catching and interfering parts in
the rotation radial of the Vertical Louver

Service Manual 71

Troubleshooting Guide

Error Code
■ Trouble Shooting
Error
code

Title

Indoor air sensor

Indoor inlet pipe sensor

Indoor outlet pipe sensor

Cause of error
• Open / Short
• Soldered poorly
• Internal circuit error
• Open / Short
• Soldered poorly
• Internal circuit error
• Open / Short
• Soldered poorly
• Internal circuit error

Check point & Normal condition
Normal resistor : 10KΩ / at 25°C (Unplugged)
Normal voltage : 2.5Vdc / at 25°C (plugged)
Normal resistor : 5KΩ/ at 25°C (Unplugged)
Normal voltage : 2.5Vdc / at 25°C (plugged)
Normal resistor : 5KΩ/ at 25°C (Unplugged)
Normal voltage : 2.5Vdc / at 25°C (plugged)

10KΩ

2.5Vdc

Ω

Check the resistance / voltage

❑ Check Point
1. Unplug the sensor on Indoor unit PCB.
2. Estimate the resistance of each sensor
3. If the resistance of the sensor is 10KΩ/5KΩ at 25°C, then sensor is normal
4. If the resistance of the sensor is 0 KΩ or ∞, then sensor is abnormal. ➔ Change the sensor.
5. Plug the sensor on Indoor unit PCB and Power ON.
6. Estimate the voltage of each sensor.
7. If the voltage of the sensor is 2.5Vdc / at 25°C, then sensor is normal.
8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. ➔ Repair or Change the PCB

72 Multi type Air Conditioner

Troubleshooting Guide
Error
code

05 / 53

Title

Communication
(Indoor ➔ Outdoor)

Cause of error

Check point & Normal condition

• Power input AC 230V.(Outdoor, Indoor)
• The connector for transmission is disconnected.
• The connecting wires are misconnected.
• Communication poorly • The GND 1,2 is not connected at main GND.
• The communication line is shorted at GND.
• Transmission circuit of outdoor PCB is abnormal.
• Transmission circuit of indoor PCB is abnormal.

❑ Check Point
1. Check the input power AC 230V.(Outdoor, Indoor)
2. Check the communication wires are correctly connected.
➔ Adjust the connection of wire
➔ Confirm the wire of "Live", "Neutral".
3. Check the resistance between communication line and GND.(Normal : Over 2MΩ)
4. Check the connector for communication is correctly connected.
5. Check the connection of GND1, GND2, and main GND.
6. If one indoor unit is operated normally, outdoor PCB is no problem.
➔ Check the another indoor unit.
* CH05 is displayed at indoor unit, CH53 is displayed at outdoor unit.

Service Manual 73

Troubleshooting Guide
Error
code

Title

D-Pipe Temp. High

Cause of error

Check point & Normal condition

• Discharge sensor
temp. high

• Check the discharge pipe sensor.
• Check the install condition for over load.
• Check the leakage of refrigerent.
• Check the SVC V/V open.

COMP OFF

115°C(239°F)

LEV OPEN(16PULSE/MIN)
100°C(212°F)
LEV OPEN(10PULSE/MIN)

95°C(203°F)

NORMAL
A2UH243FA0/A2UC243FA0

❑ Check Point
1. Check the install condition for over load.
2. Check the SVC V/V open.
3. Check the leakage of refrigerent.
4. Check the constant compressor.

Error
code

Title

Capacitor error

Cause of error

• Over Capacitor combination

❑ Check Point
1. Check the indoor unit capacity.
2. Check the combination table.
★ In the tropical model case
➔ single cycle has no error for over capacity.

74 Multi type Air Conditioner

Check point & Normal condition

• Check the indoor unit capacity.
• Check the combination table

Troubleshooting Guide
Error
code

Title

Outdoor air sensor

Condensor pipe sensor

D-Pipe sensor

Check point & Normal condition
Normal resistor : 10KΩ / at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
Normal resistor : 5KΩ/ at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
Normal resistor : 200KΩ/ at 25°C(77°F) (Unplugged)
Normal voltage : 4.5Vdc / at 25°C(77°F) (plugged)

Ω
Ω

Check the resistance
❑ Check Point
1. Estimate the resistance of each sensor.(Unplugged)
2. Estimate the voltage of each sensor.(Plugged)
3. If the resistance is 0V or 5Vdc, then sensor is abnormal

Service Manual 75

2-way, 3-way Valve

2-way, 3-way Valve
2-way Valve (Liguid Side)

3-way Valve (Gas Side)

Valve cap
Flare nut

Hexagonal wrench
(4mm)
Open position
Closed position

To
piping
connection

Flare nut

Open position
Closed position
Pin

To
piping
connection

To outdoor unit

Service Service
port cap port

To outdoor unit

Works

Shaft position

Service port

Shipping

Closed
(with valve cap)

Closed
(with cap)

Air purging
(Installation)

Open
(counter-clockwise)

Closed
(clockwise)

Open
(push-pin or with
vacuum pump)

Operation

Open
(with valve cap)

Closed
(with cap)

Pumping down
(Transfering)

Closed
(clockwise)

Open
(counter-clockwise)

Evacuation
(Servicing)

Open

Open
(with charging
cylinder)

Gas charging
(Servicing)

Open

Open
(with charging
cylinder)

Pressure check
(Servicing)

Open

Open
(with charging
cylinder)

Gas releasing
(Servicing)

Open

Open
(with charging
cylinder)

76 Multi type Air Conditioner

Open
(connected
manifold gauge)

2-way, 3-way Valve

(1) Pumping down

Indoor unit

Liquid side
2-Way
valve

Outdoor unit

Gas side
3-Way
valve

Indoor unit

Open

Liquid side
2-Way
valve

Gas side
3-Way
valve

Open

manifold gauge

Lowhandle
(CLOSE)

Hi- handle
(CLOSE)

• Procedure
1. Confirm that both the gas side and liquid side
valves are set to the open position.
- Remove the valve stem caps and confirm that the
valve stems are in the raised position.
- Be sure to use a hexagonal wrench to operate
the valve stems.
2. Operate the unit for 10 to 15 minutes.
3. Stop operation and wait for 3 minutes, then connect the manifold gauge to the service port of the
gas side valve.
- Connect the hose of the gauge with the push pin
to the service port.

6. Operate the air conditioner at the cooling cycle
and stop it when the gauge indicates 1kg/cm g.
2

7. Immediately set the gas side valve to the closed
position.
- Do this quickly so that the gauge ends up indicating 1kg/
g.
8. Disconnect the charge set, and mount the liquid
side and gas side valve caps and the service port
nut.
- Use torque wrench to tighten the service port nut
to a torque of 1.8kg.m.(4.2kg.m/5.5kg.m)
- Be sure to check for gas leakage.

4. Air purging of the charge hose.
- Open the Low-handle valve on the gauge
slightly to air purge from the hose.
5. Set the liquid side valve to the closed position.
• Be sure to short pressure S/W. otherwise Low pressure S/W detect low pressure skete and stops the compressor.

Service Manual 77

2-way, 3-way Valve

(2) Evacuation
(All amount of refrigerant leaked)

Indoor unit

Liquid side
2-Way
valve

Open

Outdoor unit

Gas side
3-Way
valve

Indoor unit

Open

Liquid side
2-Way
valve

Open

Gas side
3-Way
valve

Open

manifold gauge
Vacuum pump
Lowhandle
(OPEN)

Hi- handle
(OPEN)

• Procedure
1. Confirm that both the liguid side valve and gas
side valve are set to the opened position.
2. Connect the vaccum pump to the center hose of
the manifold gauge.
3. Connect the service port of the gas side valve to
the low side of the gauge.
4. Evacuation for approximately one hour.
- Confirm that the gauge needle has moved
toward-76 cmHg (vacuum of 4 mmHg or less).
5. Close the Low handle of the gauge turn off the
vacuum pump, and confirm that the gauge needle
does not move(approximately 5 minutes after
turning off the vacuum pump).

78 Multi type Air Conditioner

6. Disconnect the charge hose from the vacuum
pump.
- Vacuum pump oil.
If the vacuum pump oil becomes dirty or depleted,replenish as needed.
7. Mount the valve caps and the service port caps.

2-way, 3-way Valve

(3) Gas Charging
(After Evacuation)

Indoor unit

Liquid side
2-Way
valve

Open

Outdoor unit

Gas side
3-Way
valve

Indoor unit

Open

Liquid side
2-Way
valve

Open

Gas side
3-Way
valve
Charging
cylinder

Open

manifold gauge

Low-handle
Check valve (OPEN)

Hi- handle
(OPEN)

• Procedure
1. Connect the gauge to the charging cylinder.
- Connect the charge hose which you disconnected from the vacuum pump to the valve at the
bottom of the cylinder.
- If you are using a gas cylinder, also use a scale
and reverse the cylinder so that the system can
be charged with liquid.
2. Purge the air from the charge hose.
- Open the valve at the bottom of the cylinder and
press the check valve on the charge set to purge
the air. (Be careful of the liquid refrigerant). The
procedure is the same if using a gas cylinder.
3. Open the low handle on the gauge and charge
the system with liquid refrigerant.
- If the system can not be charged with the specified amount of refrigerant, it can be charged
with a little at a time (approximately 150g each
time) while operating the air conditioner in the
cooling cycle; however, one time is not sufficient, wait approximately 1 minute and then
repeat the procedure(pumping down-pin).

4. Immediately disconnect the charge hose from
the gas side valve's service port.
This is different from previous procedures.
Because you are charging with liquid refrigerant
from the gas side, absolutely do not attempt to
charge with larger amounts of liquid refrigerant
while operating the air conditioner.
- Stopping partway will allow the gas to be discharged.
- If the system has been charged with liquid
refrigerant while operating the air conditioner
turn off the air conditioner before disconnecting
the hose.
5. Mount the valve stem nuts and the service port
nut.
- Use torque wrench to tighten the service port
nut to a torque of 1.8 kg.m.(4.2kg.m/5.5kg.m.)
- Be sure to check for gas leakage.

Service Manual 79

Exploded View & Replacement Parts List

Exploded View & Replacement Parts List
Indoor Unit
S4, SE chassis
135311

152302-1

152302-2

135301

131410

152313

733010

342800
354210
359011
135312

135500
159901
346810
35211B
268712

135516

352150

147582

146811
263230-2
267110

249951

268714
668713

80 Multi type Air Conditioner

263230-1

Exploded View & Replacement Parts List
Parts List (S4, SE chassis)
PART No.
LOCATION
No.

DESCRIPTION

S4 chassis

SE chassis

AMNH093D4A0
(LMN090HE)

AMNC093D4A0
(LMN090CE)

AMNH123DEA0
(LMN120HE)

AMNC123DEA0
(LMN120CE)

SVC
CODE

131410

CHASSIS ASSEMBLY

3141A20019C

3141A20034A

135311

GRILLE ASSEMBLY,FRONT(INDOOR)

3531A14003K

3531A18015A

135301

GRILLE,FRONT

3530A10253A

3530A10287A

152302-1 FILTER,AIR

5230A20051B

5230A20064A

152302-2 FILTER,AIR

5230A20051D

5230A20064A

135312

GRILLE ASSEMBLY,DISCHARGE(INDOOR)

3531A11307A

3531A10307V

3531A11362A

3531A11362B

159901

LOUVER,HORIZONTAL

5990A20069A

5990A20068A

147582

LOUVER,VERTICAL

4758A30052A

4758A30057A

146811

MOTOR,DC

4681A20055A

268712

PCB ASSEMBLY,DISPLAY

6871A20680D

6871A20680F

6871A20680D

6871A20680F

135516

COVER ASSEMBLY,MOTOR

3551A20156B

346810

MOTOR,DC

4681AR2295L

152313

FILTER ASSEMBLY,DEODORIZER

5231A20040A

5231A20040K

249951

CASE ASSEMBLY,CONTROL(INDOOR)

4995A20831A

268714

PCB ASSEMBLY,MAIN

6871A20782A

668713

PCB ASSEMBLY(OPTION PCB)

6871A20989A

6871A20989D

6871A20989B

6871A20989C

263230-1 THERMISTOR,NTC

6323AQ3226T

263230-2 THERMISTOR,NTC

6323A20004A

267110

REMOTE CONTROLLER ASSEMBLY

6711A20128C

6711A20128A

6711A20128C

6711A20128A

342800

BEARING

4280A20004B

354210

EVAPORATOR ASSEMBLY,FINAL

5421A20222C

5421A20282A

35211B

TUBE ASSEMBLY,TUBING

5211A21363E

5211A15008A

352150

HOSE ASSEMBLY,DRAIN

5251A20011B

5251A20011G

359011

FAN ASSEMBLY,CROSS FLOW

5901A20017F

5901A20017H

733010

PLATE ASSEMBLY,INSTALLATION

3301A20020C

3301A20020A

135500

COVER

3550A30262A

3550A30315A

NOTE) *Please ensure GCSC since these parts may be changed depending upon the buyer's request.
(GCSC WEBSITE http://biz.LGservice.com)

Service Manual 81

82 Multi type Air Conditioner

135314

135312

267110

268712

159830

268717-1
146811

268717-2

249951

330870

268714

359012

135500-3

349600

135500-2

346810

352380

147581

146811

354210

35211B

263230-2

147581

146811

352150

135515

135500-1

131410

263230-1

146811

147581

Exploded View & Replacement Parts List
SP3 Chassis Art Cool Type

Exploded View & Replacement Parts List
Parts List (SP3 chassis)
PART No.
LOCATION
No.

DESCRIPTION

AMNH093APM0 AMNC093APM0 AMNH123APM0 AMNC123APM0
(LMAN090HNS) (LMAN090CNS) (LMAN120HNS) (LMAN120CNS)

SVC
CODE

131410 CHASSIS ASSEMBLY

3141A20030C

135312 GRILLE ASSEMBLY,FRONT(INDOOR)

3531A21035N

3531A21035T

3531A21035N

3531A21035T

135314 GRILLE ASSEMBLY,INLET

3531A20212K

152302 FILTER, AIR

5230A20032A

268712 PCB ASSEMBLY,DISPLAY

6871A20462A

6871A20462B

6871A20462A

6871A20462B

268717-1 PCB ASSEMBLY,SUB

6871A20259B

268717-2 PCB ASSEMBLY,SUB

6871A20363D

135500-1 COVER

3550A20123C

135500-2 COVER

3550A20124B

135500-3 COVER

3550A20060A

135515 COVER ASSEMBLY,TOP(INDOOR)

3551A20031H

147581 LOUVER,HORIZONTAL

4758A20014B

146811 MOTOR,DC

4681A20055A

159830 FILTER ASSEMBLY,AIR CLEANER

5983A20007F

249951 CASE ASSEMBLY,CONTROL(INDOOR) 4995A20832B

4995A20832A

4995A20832D

4995A20832C

268714 PCB ASSEMBLY

6871A20387K

6871A20387M

6871A20387N

263230-2 THERMISTOR,NTC(ROOM+IN PIPE)

6323A20004N

263230-1 THERMISTOR,NTC(OUT PIPE)

6323AQ3226T

267110 REMOTE CONTROLLER ASSEMBLY

6711A20128F

6711A20083R

6711A20128F

6711A20083R

330870 PAN ASSEMBLY,DRAIN

3087A30004A

346810 MOTOR,UNCLASSIFIED

4681A20047B

349600 BRACKET,MOTOR

4960A20016A

35211B TUBE ASSEMBLY,TUBING

5211AR7066F

352150 HOSE ASSEMBLY,DRAIN

5251AR1222R

354210 EVAPORATOR ASSEMBLY,FIRST

5421A20072A

359012 FAN,TURBO

5900A00003A

NOTE) *Please ensure GCSC since these parts may be changed depending upon the buyer's request.
(GCSC WEBSITE http://biz.LGservice.com)

Service Manual 83

435301

435512

437210

559010

84 Multi type Air Conditioner
552201
430411

447910

546810

554160-1

566000

W0CCZ-2

W0CCZ-1

552202

554031

552113-2

554160-2

552204-2

552204-1

548490

668711

137213-1

435300

561410

263230-2

263230-1

552203-2

552203-1

552203-2

552203-1

561411-2

561411-1

649950

435511

137213-2

Exploded View & Replacement Parts List

Outdoor Unit

A2UH243FA0(LMU240HE), A2UC243FA0 (LMU240CE)

Exploded View & Replacement Parts List
Parts List (A2UH243FA0(LMU240HE), A2UC243FA0 (LMU240CE))
Location
No.
437210

Part No.
Description
PANEL ASSEMBLY,FRONT(SUB)

A2UH243FA0(LMU240HE)
1A00197C

SVC
CODE
A2UC243FA0 (LMU240CE)
1A00197C

137213-1

PANEL ASSEMBLY,SIDE

1A00202F

137213-2

PANEL ASSEMBLY,SIDE

3A02284R

435300

GRILLE,REAR

1A00208H

435301

GRILLE,DISCHARGE

3530A20007J

435512

COVER ASSEMBLY,TOP(OUTDOOR)

3551A30113C

430411

BASE ASSEMBLY,OUTDOOR

3041AP2741G

554031

CONDENSER ASSEMBLY,BENDING

5403A20257A

5403A20022T

546810

MOTOR,UNCLASSIFIED

4681A20008E

559010

FAN ASSEMBLY,PROPELLER

1A00195B

554160-1

COMPRESSOR SET, KOREA(LEFT)

2520UGHK2AA(GK141KAA)

554160-2

COMPRESSOR SET,KOREA(RIGHT)

2520UGJK2AA(GK094KAA)

447910

BARRIER ASSEMBLY,OUTDOOR

4791A30004H

649950

CASE ASSEMBLY,CONTROL(OUTDOOR)

4995A00002G

668711

PCB ASSEMBLY,MAIN

6871A20500B

COVER ASSEMBLY,CONTROL(OUTDOOR)

3551A10044E

3551A10044F

WOCZZ-1

435511

CAPACITOR,FILM,BOX

2A00986G

WOCZZ-2

CAPACITOR,FILM,BOX

6120AR2194F

548490

ACCUMULATOR ASSEMBLY

4848A20012A

561410

SOLENOID(COIL ASSEMBLY, REVERSE)

3A02028Z

552204-1

DRAWING,ASSEMBLY(EEV COIL)

6877A20050A

552204-1

DRAWING,ASSEMBLY(EEV COIL)

6877A20050B

552203-1

VALVE,SERVICE(Ø9.52)

5220A20001K

552203-2

VALVE,SERVICE(Ø6.35)

2H02479J

561411

VALVE,EXPANSION BODY

6140A90001K

552202

VALVE,REVERSE

5220AR3228E

552201

VALVE,CHECK

5220A30004A

566000

SWITCH,PRESSURE

6600L000013

263230-1

THERMISTOR,NTC

6323A20026A

263230-2

THERMISTOR,NTC

6323A20001N

NOTE) *Please ensure GCSC since these parts may be changed depending upon the buyer's request.
(GCSC WEBSITE http://biz.LGservice.com)
Solenoid(Coil Assempy, Reverse) is only for heat pump model.

Service Manual 85

April, 2006
Printed in Korea
P/No.: 3828A20462Z

Source Exif Data:

File Type                       : PDF
File Type Extension             : pdf
MIME Type                       : application/pdf
PDF Version                     : 1.4
Linearized                      : No
Create Date                     : 2006:05:03 15:46:56Z
Modify Date                     : 2006:05:03 21:41:44+09:00
Page Count                      : 86
Creation Date                   : 2006:05:03 15:46:56Z
Producer                        : Acrobat Distiller 4.05 for Macintosh
Author                          : È² Á
Mod Date                        : 2006:05:03 21:41:44+09:00
Metadata Date                   : 2006:05:03 21:41:44+09:00
Creator                         : È² Á
Title                           : 3828A20462Z(Ç¥Áö)

EXIF Metadata provided by EXIF.tools

Lg A2Uc243Fa0 Lmu240Ce Users Manual 3828A20462Z(Ç¥Áö)

AMNH093APM0(LMAN090HNS) .php?file=LG-2787

A2UH243FA0(LMU240HE) 121736-1

AMNH123DEA0 (LMN120HE) to the manual 74efb757-53ca-4692-b4b7-e940b111f303

Navigation menu

Versions of this User Manual:

Views

Navigation