LG AS-H076PB-D-M-WL1, AS-H096PB-D-M-WL1 User Manual

LG

Room

Air Conditioner

SERVICE MANUAL

LG

CAUTION

website http://www.lgservice.com

MODELS: AS-H076PB/D/M/WL1

AS-H096PB/D/M/WL1
A-12AH series

• BEFORE SERVICING THE UNIT, READ THE SAFETY
PRECAUTIONS IN THIS MANUAL.

• ONLY FOR AUTHORIZED SERVICE PERSONNEL.

Air Conditioner Service Manual

TABLE OF CONTENTS

LG Model Name ...............................................................................................................................................3

Safety Precautions..........................................................................................................................................4

Dimensions .....................................................................................................................................................8

Symbols used in this Manual......................................................................................................................8

Indoor Unit..................................................................................................................................................8

Outdoor Unit...............................................................................................................................................9

Product Specifications ................................................................................................................................11

Installation .....................................................................................................................................................12

Select the Best Location .........................................................................................................................12

Piping Length and Elevation.....................................................................................................................12

Preparing Work for Installation.................................................................................................................13

Fixing the Indoor Unit ...............................................................................................................................14

Drill a Hole in the wall...............................................................................................................................14

Flaring Work.............................................................................................................................................15

Connecting the Pipings ............................................................................................................................16

Connecting the Cables to the Indoor Unit ................................................................................................19

Connecting the Cables to the Outdoor Unit..............................................................................................20

Checking the Drainage.............................................................................................................................21

Forming the Piping ...................................................................................................................................21

Air Purging ...............................................................................................................................................22

Air Purging with Vacuum Pump................................................................................................................22

Front Panel Assembly ..............................................................................................................................24

Test Running ............................................................................................................................................25

Operation ......................................................................................................................................................26

Function of Controls .................................................................................................................................26

Display Function.......................................................................................................................................33

Self-diagnosis Function............................................................................................................................34

Remote Control Operations......................................................................................................................35

Disassembly ..................................................................................................................................................36

Indoor Unit................................................................................................................................................36

Schematic Diagram.......................................................................................................................................38

Electric control Device..............................................................................................................................38

Wiring Diagram.........................................................................................................................................39

Components Location ..............................................................................................................................40

Troubleshooting Guide.................................................................................................................................42

Refrigeration Cycle Diagram ....................................................................................................................42

2-way, 3-way Valve ...................................................................................................................................43

Cycle Parts...............................................................................................................................................48

Electronic Parts ........................................................................................................................................49

Exploded View ..............................................................................................................................................56

Indoor Unit...............................................................................................................................................56

Outdoor Unit............................................................................................................................................57

Replacement Parts List ................................................................................................................................59

Indoor ......................................................................................................................................................59

Outdoor ....................................................................................................................................................60

2 Room Air Conditioner

LG Model Name

12 - 345678910

Code Type Code of Model Meaning

1 Producing Center, A~Z L: Chang-won R22 N: India

Refrigerant A: Chang-won R410A Z: Brazil

C: Chang-won R407C D: Indonesia
T: China M: Mexico
K: Turkey R22 V: Vietnam
E: Turkey R410A S: Out Sourcing
H: Thailand

2 Product Type A~Z S: Split Type Air Conditioner

3 Cooling/Heating/Inverter A~Z C: Cooling only

H: Heat pump
X: C/O + E/Heater
Z: H/P + E/Heater

V: AC Inverter C/O
N: AC Inverter H/P
Q: DC Inverter C/O
W: DC Inverter H/P

4, 5 Capacity 0~9 Cooling/Heating Capacity

Ex. "09" → 9,000 Btu/h

6 Electric Range 1~9 1: 115V/60Hz, A: 220V, 50Hz, 3Phase

A~Z 2: 220V/60Hz B: 208~230V, 60Hz, 3Phase

3: 208-230V/60Hz C: 575V, 50Hz, 3Phase
5: 200-220V/50Hz D: 440~460, 60Hz, 3Phase
6: 220-240V/50Hz E: 265V, 60Hz
7: 110V, 50/60Hz F: 200V, 50/60Hz
8: 380-415V/50Hz
9: 380-415V/60Hz

7 Chassis A~Z Name of Chassis of Unit

Ex. LSP → SP Chassis

8 Look A~Z Look,

Color (Artcool Model)

9 Function A~Z

10 Serial No. 1~9 LG Model De

* ARTCOOL COLOR

velopment Serial No.

Basic A
Basic+4Way B
Plasma Filter C
Plasma Filter+4 Way D
Tele+LCD E
Tele+LCD+Nano plasma+4Way F
Nano Plasma F+(A/changeove)+A/clean+Low A G
Nano Plasma F+(A/changeove)+A/clean+4way+Low A H
Tele+LED+4way I
Internet J
Plasma F+4Way+Oxy generator K
Nano Plasma F+(A/changeove)+A/clean L
Nano Plasma F+(A/changeove)+A/clean+4way M
Nano Plasma F+(A/changeove)+A/clean+PTC N
Nano Plasma F+(A/changeove)+Autoclean+4way+PTC P
Nano Plasma F+(A/changeove)+A/clean+4way+Low A+PTC Q
Negative ION+A/Clean R
(Nano)Plasma+Negative ION+A/Clean S
4way+(Nano)Plasma F+Negative ION+Healthy dehumidification+A/Clean

T

Nano Plasma F+4Way+(A/changeove)+A/clean+ U

R Mirror
W White
B Blue
D Wood
M Metal
C Cherry

2003

Service Manual 3

Safety Precautions

Wax

Thinner

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

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

This symbol indicates the possibility of death or serious injury.

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

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

Be sure not to do.

Be sure to follow the instruction.

■ Installation

Always perform grounding. Don’t use a power cord, a plug

or a loose socket which is
damaged.

• Otherwise, it may cause electrical

shock.

Securely attach the electrical
part cover to the indoor unit
and the service panel to the

• Otherwise, it may cause a fire or
electrical shock.

Always install an air leakage
breaker and a dedicated
switching board.

outdoor unit.

• If the electrical part cover of the
indoor unit and the service panel of
the outdoor unit are not attached
securely, it could result in a fire or
electric shock due to dust, water, etc.

• No installation may cause a fire and
electrical shock.

For installation of the product,
always contact the service center or
a professional installation agency.

• Otherwise, it may cause a fire, elec­trical shock, explosion or injury.

Do not keep or use flammable
gases or combustibles near
the air conditioner.

• Otherwise, it may cause a fire or the
failure of product.

4 Room Air Conditioner

Safety Precautions

Ensure that an installation
frame of the outdoor unit is
not damaged due to use for a

Do not disassemble or repair
the product randomly.

Do not install the product at a
place that ther is concern of
falling down.

long time.

• It may cause injury or an accident. • It will cause a fire or electrical shock. • Otherwise, it may result in personal
injury.

■ Operation

Use caution when unpacking
and installing.

• Sharp edges may cause injury. • It will cause an electric shock or a

Do not share the outlet with
other appliances.

fire due to heat generation.

Do not use the damaged
power cord.

• Otherwise, it may cause a fire or
electrical shock.

Do not modify or extend the
power cord randomly.

• Otherwise, it may cause a fire or
electrical shock.

Take care so that the power
cord may not be pulled during
operation.

• Otherwise, it may cause a fire or
electrical shock.

Unplug the unit if strange
sounds, smell, or smoke
comes from it.

• Otherwise, it may cause electrical
shock or a fire.

Service Manual 5

Safety Precautions

Keep the flames away.

Take the power plug out if neces­sary, holding the head of the plug
and do not touch it with wet hands.

• Otherwise, it may cause a fire. • Otherwise, it may cause a fire or
electrical shock.

Do not open the suction inlet
of the indoor/outdoor unit dur-

Do not allow water to run into
electrical parts.

ing operation.

• Otherwise, it may electrical shock
and failure.

• Otherwise, it may cause the failure of
machine or electrical shock.

Do not use the power cord
near the heating tools.

• Otherwise, it may cause a fire and
electrical shock.

Never touch the metal parts of
the unit when removing the fil­ter.

• They are sharp and may cause
injury.

Do not step on the indoor/outdoor unit and do

Do not place a heavy object on the power cord.

not put anything on it.

• It may cause an injury through dropping of the unit or
falling down.

When the product is submerged into water,
always contact the service center.

• Otherwise, it may cause a fire or electrical shock. • Otherwise, children may be seriously injured due to

• Otherwise, it may cause a fire or electrical shock.

Take care so that children may not step on the
outdoor unit.

falling down.

6 Room Air Conditioner

■ Installation

Wax

Thinner

Safety Precautions

Install the drain hose to
ensure that drain can be
securely done.

Install the product so that the
noise or hot wind from the
outdoor unit may not cause

Always inspect gas leakage
after the installation and repair
of product.

any damage to the neighbors.

• Otherwise, it may cause water leak­age.

• Otherwise, it may cause dispute with
the neighbors.

• Otherwise, it may cause the failure of
product.

■ Operation

Keep level parallel in installing the product. Avoid excessive cooling and perform ventila-

tion sometimes.

• Otherwise, it may cause vibration or water leakage. • Otherwise, it may do harm to your health.

Use a soft cloth to clean. Do not use wax, thin­ner, or a strong detergent.

• The appearance of the air conditioner may deteriorate,
change color, or develop surface flaws.

When gas leaks, open the window for ventila­tion before operating the unit.

• Otherwise, it may cause explosion, and a fire.

Service Manual 7

Dimensions

Pipe Hole

Fix Hole

Hanger Hole

H

W

D

NOTICE

Dimensions

Symbols used in this Manual

This symbol alerts you to the risk of electric shock.

This symbol alerts you to hazards that may cause harm to the
air conditioner.

This symbol indicates special notes.

Indoor Unit

Model

Dimension

W mm 570

H mm 568

D mm 137

8 Room Air Conditioner

INDOOR UNIT

Outdoor Unit

W

L2

L3

L1

D

H

L4

L5

Gas side

(3-way valve)

Liquid side

(2-way valve)

Dimensions

MODEL

AS-H076PB/D/M/WL1

DIM unit

W mm 575

H mm 525

D mm 260

L1 mm 301

L2 mm 73

L3 mm 392

L4 mm 35

L5 mm 100

Service Manual 9

W

L2

L3

L1

D

H

L4

L5

Gas side

(3-way valve)

Liquid side

(2-way valve)

Dimensions

DIM unit

W mm 770

H mm 540

D mm 245

L1 mm 285

L2 mm 64

L3 mm 518

L4 mm 10

L5 mm 100

10 Room Air Conditioner

MODEL

AS-H096PB/D/M/WL1, AS-H126PB/D/M/WL1

Product Specifications

Table-1

Model Name

AS-H076PB/D/M/WL1 AS-H096PB/D/M/W/L1 A-12AH series

Item Unit

Product Specifications

Cooling Capacity

Heating Capacity

Moisture Removal l/h

Power Source Ø, V, Hz

Air Circulation

Noise Level

Input

Running Cooling

Current Heating

E.E.R. Cooling Btu/hW

C.O.P Heating

Motor Output

Dimensions
(W x H x D)

Net. Weight

Indoor

Outdoor

Indoor

Outdoor

Cooling

Heating

Indoor

Outdoor

Indoor

Outdoor

Indoor

Outdoor

Btu/h

m3/min

dB (A)±3

W

A

W

mm

kg

7500 9200 12000

7700 9400 12200

1 1.2 1.5

1Ø, 220-240V, 50Hz 1Ø, 220-240V, 50Hz 1Ø, 220-240V, 50Hz

5.5 6.8 8.3

20 26 26

37 39 44

48 48 48

685 840 1099

705 860 1200

3 3.8 4.9

3.1 3.85 5.3

10.95 10.95 10.92

3.2 3.2 2.98

24 24 24

18 25.5 25.5

570 x 568 x 137 570 x 568 x 137 570 x 568 x 137

575 x 525 x 260 770 x 540 x 245 770 x 540 x 245

999

23 35 35

Refrigerant g

Airflow Direction Control (Up & Down)

Remocon Type

Liquid

Service Valve

Sleeping Operation

Drain Hose

Connecting Cable(p*mm2)

Power Cord(p*mm2)

Gas

inch(mm)

750(R410A) 870(R410A) 880(R410A)

OOO

L.C.D Wireless L.C.D Wireless L.C.D Wireless

1/4 (6.35) 1/4 (6.35) 1/4 (6.35)

3/8 (9.52) 3/8 (9.52) 1/2 (12.7)

OOO

OOO

3*1.0mm2+ 2*0.75mm23*1.0mm2+ 2*0.75mm23*1.0mm2+ 2*0.75mm

3*1.0mm

2

3*1.0mm

2

3*1.0mm

2

Service Manual 11

2

Installation

More than 10cm

More

than 50cm

More than 2m

More

than 50cm

More than 10cm More than 10cm

More
than 60cm

More than 60cm

More than 70cm

Outdoor unit

Indoor unit

A

B

Outdoor unit

Indoor unit

A

B

A

Oil trap

Outdoor unit

Indoor unit

B

I

Installation

Selection of the Best Location

Indoor unit

• Do not have any heat or steam near the unit.

• Select a place where there are no obstacles in
front of the unit.

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

• Ensure that the space around the left and right of
the unit is more than 50cm. The unit should be
installed as high on the wall as possible, allowing a
minimum of 10cm from ceiling.

• Use a stud finder to locate studs to prevent unnec­essary damage to the wall.

Piping Length and Elevation

Max.

(m)

Max.

Elevation

B (m)

Capacity

(Btu/h)

7k, 8k, 9k 3/8" 1/4" 7.5 7 15 20

12k, 18k~28k 1/2" 1/4" 7.5 7 15 20

Pipe Size

GAS LIQUID

Standard

Length

Length

A

(m)

Additional

Refrigerant

(g/m)

CAUTION:

where the height from the floor is more than 2
meter.

Install the indoor unit on the wall

Outdoor unit

• 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.

• Ensure that the space around the back and sides
is more than 10cm. The front of the unit should
have more than 70cm of space.

• Do not place animals and plants in the path of the
warm air.

• Take the air conditioner weight into account and
select a place where noise and vibration are mini­mum.

• Select a place so that the warm air and noise from
the air conditioner do not disturb neighbors.

12 Room Air Conditioner

If the piping length is more than 5m

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.

NOTICE

Installation

Panel Front

Connector

Pipe hole

Side cover

rubber cap

Only the

desired direction

Connecting

part

Adhesive

Drain

hose

Preparing Work for Installation

Open front panel

1. Push the front panel backward and lift it up to remove the two screws.

2. As soon as you lift the both lower parts of panel front, you can hear the sound from panel front. At this moment
panel front is separated

3. After pulling down this panel a bit, separate connecting wire from the product.

Remove pipe cover and side cover

1. Remove two screws(for fixing pipe cover)

2. Pull up the side cover of desired connecting direction,
and then side cover is separated.

3. Pick the pipe hole of the side cover.

CAUTION: After removing the pipe
hole, cut the burr for safety.

When making pipe path through rear
wall, you don’t need to pick the pipe hole.

Drain hose junction

1. Remove the rubber stopple in the desired drain direc­tion.

2. Insert drain hose into the handle of drain pan, and
join drain hose and connecting hose according to the
figure by.

Service Manual 13

Installation

5-7mm

(0.2~0.3")

Indoor

WALL

Outdoor

I

Fixing the Indoor Unit

1. Attach an Installation guide map on the
desired surface.

INSTALLATION GUIDE MAP

2. Make a hole with a diameter of 6mm and
depth of 30-35mm by piercing a screw
point.

INSTAIIATION GUIDE MAP

3. Drive the fore plastic anchors into drilled
points.

Plastic anchors

INSTALLATION GUIDE MAP

4. Hang the hole of product at the upper
screws, and remove the map. (Falling
attention)

INSTALLATION GUIDE MAP

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

NSTALLATION GUIDE MAP

Horizontality

Drill the pierted part as a diameter of 50mm

7.
for connecting piping. (In case of piercing
rear surface)

8.

First, Drive the two points of the upper

parts by screws. (Leave 10mm for hanging
the product)

INSTALLATION GU

10mm

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

Hanger hole

(Rear side of

the 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.

10.

In case of nothing wrong, connect the
pipe and the wire. (Refer to installation
manual)

Plastic anchors

14 Room Air Conditioner

Installation

Copper

pipe

90°

Slanted Uneven Rough

Bar

Copper pipe

Clamp handle

Red arrow mark

Cone

Yoke

Handle

Bar

"A"

Flaring Work

Main cause for gas leakage is due to defect in flaring work. Carry out correct flaring work in the following procedure.

Cutting 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.

3. Cut the pipes a little longer than measured distance.

4. Cut the cable 1.5m longer than the pipe length.

Removing burrs

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.

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)

Flaring work

1. Firmly hold copper pipe in a die in the dimension shown
in the table below.

Pipe

Reamer

Point down

Flare nut

Copper tube

2. Carry out flaring work with the flaring tool.

Outside diameter A

mm inch mm

Ø6.35 1/4 0~0.5
Ø9.52 3/8 0~0.5

Ø12.7 1/2 0~0.5
Ø15.88 5/8 0~1.0
Ø19.05 3/4 1.0~1.3

Service Manual 15

Installation

NOTICE

Inclined

Inside is shiny without scratches

Smooth all round

Even length

all round

Surface

damaged

Cracked Uneven

thickness

= Improper flaring =

Drain hose

Check

1. Compare the flared work with the figure by.

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

Connecting the Pipings

Indoor

Preparing the indoor unit's piping and drain hose for installation through the wall.

Route the indoor tubing and the drain hose in the
direction of rear left or right

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 upper
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.

Connecting
cable

Drain hose

Loop

Gas side piping

Liquid side piping

16 Room Air Conditioner

Connecting the pipings with the indoor unit

Wrap with vinyl tape

Drain hose

Pipe

Vinyl tape(wide)

Vinyl tape

Adhesive

Drain hose

Indoor unit drain hose

(narrow)

and drain hose with drain pipe

1. Align the center of the pipings and sufficiently tighten
the flare nut by hand.

2. Tighten the flare nut with a wrench.

Outside diameter Torque

mm inch kg.m

Ø6.35 1/4 1.8
Ø9.52 3/8 4.2

Ø12.7 1/2 5.5
Ø15.88 5/8 6.6
Ø19.05 3/4 6.6

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

Indoor unit tubing Flare nut Pipes

Wrench

Indoor unit tubing

Installation

Open-end wrench (fixed)

Flare nut

Connection pipe

Wrap the insulation material around the
connecting portion.

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.

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

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

Connection
pipe

Vinyl tape
(wide)

Plastic bands

Connecting cable

Vinyl tape(narrow)

Insulation material

Wrap with vinyl tape

Indoor
unit pipe

Pipe

Service Manual 17

Installation

Outdoor unit

Gas side piping
(Bigger diameter)

Liquid side
piping
(Smaller
diameter)

Torque wrench

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.

• When tightening the flare nut with torque wrench,

ensure the direction for tightening follows the arrow on
the wrench.

Outside diameter Torque

mm inch kg.m

Ø6.35 1/4 1.8
Ø9.52 3/8 4.2

Ø12.7 1/2 5.5
Ø15.88 5/8 6.6
Ø19.05 3/4 6.6

18 Room Air Conditioner

Installation

Air

Conditioner

Main power source

Circuit Breaker
Use a circuit breake
or time delay fuse.

NORMAL
CROSS-SECTIONAL
AREA 0.75mm2

Connecting the Cables to the Indoor Unit.

• Connect the cables to the indoor unit by connecting the wires to the terminals on the control board
dividually 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.)

• Before connecting the cables to the terminal block, remove the cables in the holder of the control cover and
do it.

CAUTION:

• The above circuit diagram is subject to change without notice.

• The earth wire should be longer than the common wires.

• When installing, refer to the circuit diagram behind the panel front of the indoor unit.

• Connect the wires firmly so that they may not be pulled out easily.

• Connect the wires according to color codes, referring to the wiring diagram.

CAUTION: If a power plug is not
used, provide a circuit breaker
between power source and the unit
as shown by.

CAUTION:

The power cord connected to the "A" unit should be selected according to

the following specifications(Type "B" approved by HAR or SAA).

(mm2)

NORMAL CROSS

-SECTIONAL AREA

Unit(A) Indoor Indoor Indoor Indoor Outdoor Outdoor

Cable Type(B) H05VV-F H05VV-F H05VV-F H05VV-F H05RN-FH05RN-F

5k~9k 12k~14k 18k 24k~28k 30k, 32k 36k, 38k

0.75 1.0 1.5 2.5 2.5 5.5

Grade

The power connecting cable connecting the indoor and outdoor unit should be selected
according to the following specifications (Type "B" approved by HAR or SAA).

(mm2)

NORMAL

CROSS

-SECTIONAL

Cable Type(B) H07RN-F H07RN-F H07RN-F H07RN-F

5k~9K 12k~14k 18k 24k~28k

AREA

Grade

0.75 1.0 1.5 2.5

NORMAL CROSS

-SECTIONAL AREA

Cable Type(B) H07RN-F H07RN-F

30k, 32k 36k, 38k

0.75 0.75

(mm2)

Grade

Service Manual 19

Installation

Terminal block

Over 5mm

Cover control

Connecting cable

Connecting cable

Connecting the Cables to the Outdoor Unit

1. Remove the control cover from the unit by loos-

Outdoor Unit

ening the screw.
Connect the wires to the terminals on the control
board individually.

2. Secure the cable onto the control board with the
cord clamp.

3. Refix the control cover to the original position
with the screw.

4. Use a recognized circuit breaker "A"
between the power source and the unit.
A disconnecting device to adequately disconnect
all supply lines must be fitted.

Circuit

Breaker

(A)

7K~18K ~26K ~30K ~38K

15 20 30 40

Grade

CAUTION: After the confirmation of the above conditions, prepare the wiring as
follows:

1) Never fail to have an individual power circuit specifically for the air conditioner. As for the method of wiring,
be guided by the circuit diagram posted on the inside of control cover.

2) The screw which fasten the wiring in the casing of electrical fittings are liable to come loose from vibrations
to which the unit is subjected during the course of transportation. Check them and make sure that they are
all tightly fastened. (If they are loose, it could cause burn-out of the wires.)

3) Specification of power source.

4) Confirm that electrical capacity is sufficient.

5) See to that the starting voltage is maintained at more than 90 percent of the rated voltage marked on the
name plate.

6) Confirm that the cable thickness is as specified in the power source specification.
(Particularly note the relation between cable length and thickness. (Refer to page 19)

7) Always install an earth leakage circuit breaker in a wet or moist area.

8) The following would be caused by voltage drop.

• Vibration of a magnetic switch, which will damage the contact point, fuse breaking, disturbance of the normal func-

tion of the overload.

9) The means for disconnection from a power supply shall be incorporated in the fixed wiring and have an air
gap contact separation of at least 3mm in each active(phase) conductors.

20 Room Air Conditioner

Checking the Drainage Forming the Piping

Taping

Drain
hose

Pipings

Connecting
cable

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

Seal small openings
around pipings with a
gum type sealer.

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

Trap

Trap

Downward slope

Do not raise

Accumulated
drain water

Tip of drain hose
dipped in water

Air

Waving

Water
leakage

Water
leakage

Ditch

Less than
50mm gap

Water
leakage

Installation

1. Checking the drainage.

• Pour a glass of water on the evaporator.

• Ensure the water flows through the drain hose of

the indoor unit without any leakage and goes out
the drain exit.

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

• 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.

2. In cases where the outdoor unit is installed
below the indoor unit perform the following.

• Tape the piping, drain hose and connecting cable

from down to up.

• Secure the tapped piping along the exterior wall

using saddle or equivalent.

2. Drain piping

• The drain hose should point downward for easy
drain flow.

• Do not make drain piping like the following.

3. In cases where the Outdoor unit is installed
above the Indoor unit perform the following.

• Tape the piping and connecting cable from down

to up.

• Secure the taped piping along the exterior wall.

Form a trap to prevent water entering the room.

• Fix the piping onto the wall by saddle or equiva-

lent.

Service Manual 21

Installation

Lo

Hi

Indoor unit

Outdoor unit

Manifold valve

Charge hose

Nitrogen gas
cylinder(in vertical
standing position)

Pressure
gauge

Air Purging

Air and moisture remaining in the refrigerant system
have undesirable effects as indicated below.

• Pressure in the system rises.

• Operating current rises.

• Cooling(or heating) efficiency drops.

• Moisture in the refrigerant circuit may freeze and

block capillary tubing.

• Water may lead to corrosion of parts in the refrig­eration system.

Therefore, the refrigerant system must be leak test­ed and evacuated to remove any noncondensables
and moisture from the system.

Air Purging with Vacuum Pump

1. 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. Note that both the liquid and the
gas side service valves on the outdoor unit are
kept closed at this stage.

• Do a leak 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.

• 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.

2. Leak test

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

valve for this purpose. The "Hi" knob of the manifold
valve must always be kept close.

• 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.

the cylinder must be higher than its bottom when you
pressurize the system. Usually, the cylinder is used
in a vertical standing position.

CAUTION:

for air purging. If it is not available, use a stop

CAUTION:

refrigerant system in a liquid state, the top of

Be sure to use a manifold valve

To avoid nitrogen entering the

22 Room Air Conditioner

Soap water method

Gas side

Liquid side

Cap

Hexagonal wrench

3-way valve

(Close)

3-way valve

(Close)

2-way valve

(Open)

2-way valve

(Open)

(1) Remove the caps from the 2-way and 3-way

valves.
(2) Remove the service-port cap from the 3-way valve.
(3) To open the 2-way valve turn the valve stem coun-

terclockwise approximately 90°, wait for about 2~3

sec, and close it.
(4) Apply a soap water or a liquid neutral detergent on

the indoor unit connection or outdoor unit connec-

tions by a soft brush to check for leakage of the

connecting points of the piping.
(5) If bubbles come out, the pipes have leakage.

3. Evacuation

• 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.

Installation

Indoor unit

Required time for evacuation when 30 gal/h vacuum pump is

4. Finishing the job

used

If tubing length is less than 10m

(33 ft)

10 min. or more 15 min. or more

if tubing length is longer than 10m

(33 ft)

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

• With a service valve wrench, turn the valve stem of
liquid side valve counter-clockwise to fully open
the valve.

• Turn the valve stem of gas side valve counter­clockwise to fully open the valve.

• Loosen the charge hose connected to the gas side
service port slightly to release the pressure, then
remove the hose.

• 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.

• 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 to test run.

Pressure
gauge

Open

Outdoor unit

Manifold valve

Lo Hi

Close

Vacuum pump

Service Manual 23

Installation

Front Panel Assembly

1. First, Check the side cover assembly exactly,
and fix the power cord in the bottom groove of
cover side left.

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

3. Screw up the front panel, and suspend the hook
of the front panel in the groove.

Panel Front

Connector

24 Room Air Conditioner

Test Running

NOTICE

NOTICE

Bolt

Tubing connection

Discharge
temperature

Discharge air

Intake temperature

1. Check that all tubing and wiring have been properly
connected.

2. Check that the gas and liquid side service valves are
fully open.

Prepare remote controller

1. Remove the battery cover
by pulling it according to the
arrow direction.

2. Insert new batteries making
sure that the (+) and (–) of
battery are installed correctly.

3. Reattach the cover by

pushing it back into position.

• Use 2 AAA(1.5volt) batteries. Do not use
rechargeable batteries.

• Remove the batteries from the remote
control if the system is not going to be
used for a long time.

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 anti­vibration bushing.

4. For reference; the gas side pressure of optimum
condition is as below.(Cooling)

Refrigerant

R-22 35°C (95°F) 4~5kg/cm2G(56.8~71.0 P.S.I.G.)

R-410A 35°C (95°F) 8.5~9.5kg/cm

Outside ambient

TEMP.

The pressure of the gas side

service valve.

2

G(120~135 P.S.I.G.)

If the actual pressure is higher than shown,
the system is most likely over-charged, and
charge should be removed. If the actual pres­sure are lower than shown, the system is
most likely undercharged, and charge should
be added.

The air conditioner is now ready for use.

PUMP DOWN

This is performed when the unit is to be relocated
or the refrigerant circuit is serviced.

Pump Down means collecting all refrigerant in the
outdoor unit without loss in refrigerant gas.

CAUTION:

Be sure to perform Pump Down procedure with the
unit cooling mode.

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 (Heating).

Pump Down Procedure

1. Connect a low-pressure gauge manifold hose to
the charge port on the gas side service valve.

2. Open the gas side service valve halfway and purge
the air from the manifold hose using the refrigerant
gas.

3. Close the liquid side service valve(all the way in).

4. Turn on the unit's operating switch and start the
cooling operation.

5. When the low-pressure gauge reading becomes 1
to 0.5kg/cm2 G(14.2 to 7.1 P.S.I.G.), fully close the
gas side valve stem and then quickly turn off the
unit. At that time, Pump Down has been completed
and all refrigerant gas will have been collected in
the outdoor unit.

Service Manual 25

Operation

Operation

Function of Controls

DISPLAY

1) C/O Model (high quality LCD remote controller supplied)

Operation Indicator

• On while in appliance operation, off while in appliance pause

Timer Indicator

• On while in timer mode (on/off) and in sleep timer mode, off when timer mode is completed or canceled.

Comp. Running Indicator

• While in appliance operation, on while in outdoor unit compressor running, off while in compressor off

Plasma Indicator

• On while in plasma mode, off while plasma mode is canceled.

Auto restart Indicator

• On while auto restart mode, off while auto restart mode is canceled.

Auto restart

• In case the power comes on again after a power failure, Auto Restarting Operation is the function to operate
procedures automatically to the previous operating conditions.
If your want to use this operation, press the Auto Restart Button.

Power(Forced Operation)

• Operation starts, when this button is pressed and stops when you press the button again.

2) H/P Model (high quality LCD remote controller supplied)

Operation Indicator

• On while in appliance operation, off while in appliance pause

Timer Indicator

• On while in timer mode (on/off) and in sleep timer mode, off when timer mode is completed or canceled

Defrost Indicator

• Off except when hot start during heating mode operation or while in defrost control.

Plasma Indicator

• On while in plasma mode, off while plasma mode is canceled.

Auto restart Indicator

• On while auto restart mode, off while auto restart mode is canceled.

Auto restart

• In case the power comes on again after a power failure, Auto Restarting Operation is the function to operate
procedures automatically to the previous operating conditions.
If your want to use this operation, press the Auto Restart Button.

Power(Forced Operation)

• Operation starts, when this button is pressed and stops when you press the button again.

■ Cooling Mode Operation

•

When the intake air temperature reaches 0.5°C below the setting temp, the compressor and the outdoor fan stop.

• When it reaches 0.5°C above the setting temp, they start to operate again.

Compressor ON Temp=> Setting Temp+0.5°C

Compressor OFF Temp => Setting Temp-0.5°C

• While in compressor running, operating with the airflow speed set by the remote controller. While in compressor
not running, operating with the low airflow speed regardless of the setting.

26 Room Air Conditioner

Operation

■ Healthy Dehumidification Mode

• When the dehumidification operation input by the remote controller is received, the intake air temperature is
detected and the setting temp is automatically set according to the intake air temperature.

26°C ≤ Intake Air Temp => 25°C

24°C ≤ Intake Air Temp < 26°C => Intake Air Temp-1°C

18°C ≤ Intake Air Temp < 24°C => Intake Air Temp-0.5°C

Intake Air Temp < 18°C => 18°C

• While in compressor off, the indoor fan repeats low airflow speed and pause.

• 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

Compressor OFF Temp. => Setting Temp-0.5°C

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

■ Heating Mode Operation

• When the intake air temp reaches +3°Cabove 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

• While in compressor on, the indoor fan is off when the indoor pipe temp. is below 26®¨C , when above 28°C , it
operates with the low or setting airflow speed (while in sleep mode, with the medium airflow speed).

• While in compressor off, the indoor fan is off when the indoor pipe temp is below 33°C , when above 35°C , it
operates with the low airflow speed.

• If overloaded while in heating mode operation, in order to prevent the compressor from OLP operation, the out­door fan is turned on/off according to the indoor pipe temp.

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

■ Defrost Control

• While in heating mode operation in order to protect the evaporator pipe of outdoor unit from freezing, reversed
to cooling cycle to defrost the evaporator pipe of the outdoor unit.

• Defrost control is available 30 minutes later since heating mode operation started, and it will not prolong over 6
minutes.

•

Deicing starts only when the outdoor pipe temperature falls below -6°C after 30 minutes passed from starting of
heating operating and more than 10 minutes operation of compressor.

• Deicing ends after 6 minutes passed from starting of deice operation or when the outdoor pipe temperature rises
over 12°C even if before 6 minutes.

■ Fuzzy Operation (C/O Model)

• According to the temperature set by Fuzzy rule, when the intake air temp is 0.5°C or more below the setting
temp, the compressor is turned off. When 0.5°C or more above the setting temp, the compressor is turned on.

Compressor ON Temp => Setting Temp+0.5°C

Compressor OFF Temp => Setting Temp+0.5°C

• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temp at that time.

Service Manual 27

Operation

26°C ≤ Intake Air Temp => 25°C

24°C ≤ Intake Air Temp<26°C => Intake Air Temp+1°C

22°C ≤ Intake Air Temp<24°C => Intake Air Temp+0.5°C

18°C ≤ Intake Air Temp<22°C => Intake Air Temp

Intake Air Temp<18°C => 18°C

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

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

■ Fuzzy Operation (H/P Model)

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

• When determining the operation mode, the compressor, the outdoor fan, and the 4 way valve are off and only
the indoor fan is operated for 15 seconds. Then an operation mode is selected according to the intake air
temp at that moment as follows.

24°C ≤ Inatake Air Temp => Fuzzy Operation for Cooling

21°C ≤ Inatake Air Temp<24°C => Fuzzy Operation for Dehumidification

Inatake Air Temp<21°C => Fuzzy Operation for Heating

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

1) Fuzzy Operation for Cooling

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

Compressor ON Temp => Setting Temp+0.5°C

Compressor OFF Temp => Setting Temp+0.5°C

• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temp at that time.

26°C ≤ Intake Air Temp => 25°C

24°C ≤ Intake Air Temp<26°C => Intake Air Temp+1°C

22°C ≤ Intake Air Temp<24°C => Intake Air Temp+0.5°C

18°C ≤ Intake Air Temp<22°C => Intake Air Temp

Intake Air Temp < 18°C => 18°C

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

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

2) Fuzzy Operation for Dehumidification

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

Compressor ON Temp => Setting Temp+0.5°C

Compressor OFF Temp => Setting Temp+0.5°C

28 Room Air Conditioner

Operation

• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temp at that time.

26°C ≤ Intake Air Temp => 25°C

24°C ≤ Intake Air Temp<26°C => Intake Air Temp+1°C

22°C ≤ Intake Air Temp<24°C => Intake Air Temp+0.5°C

18°C ≤ Intake Air Temp<22°C => Intake Air Temp

Intake Air Temp < 18°C => 18°C

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

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

3) Fuzzy Operation for Heating

• According to the setting temperature selected by Fuzzy rule, when the intake air temp is 3°C 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

• At the beginning of Fuzzy mode operation, the setting temperature is automatically selected according to the
intake air temp at that time.
20°C ≤ Intake Air Temp => Intake Air Temp + 0.5°C
Intake Air Temp < 20°C => 20°C

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

• While in Fuzzy operation, the airflow speed of the indoor fan is 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 chaos by the input of the airflow speed selec­tion key on the remote controller.

■ On-Timer Operation

• When the set time is reached after the time is input by the remote controller, 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.

■ Off-Timer Operation

• When the set time is reached after the time is input by the remote controller, 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.

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

Service Manual 29

Operation

■ Off-Timer <=> On-Timer Operation

• When the set time is reached after the on/off time is input by the remote controller, 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 controller 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 After another 30 min elapse, it increases by 1°C 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 vane automatically operates with the Chaos Swing or they are fixed to the
desired direction.

■ 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 (C/O Model)

• If the Jet Cool key is input at any operation mode while in appliance operation, the Jet Cool mode operates.

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

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

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

• During the JET COOL function at any moment, the A/C starts to blow the cool air with side louvers closed at
extremely high speed for 30 minutes setting the room temp. automatically to 18°C.

■ Jet Cool Mode Operation (H/P Model)

• While in heating mode or Fuzzy operation, the Jet Cool key cannot be input. When it is input while in the other
mode operation (cooling, dehumidification, ventilation), the Jet Cool mode is operated.”

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

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

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

• During the JET HEAT function at any moment, the A/C starts to blow the hot air with side louvers closed at
extremely high speed for 60 minutes setting the room temp. automatically to 30°C.

■ 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.

• Operation Mode that is kept on the memory

- State of Operation ON/OFF

30 Room Air Conditioner

- Operation Mode/Setting Temp/Selected Airflow Speed

- Sleep Timer Mode/Remaining Time of Sleep Timer (unit of hour)

■ Forced Operation

• Operation procedures when the remote control can't be used.

• The operation will be started if the power button is pressed.

• If you want to stop operation, re-press the button.

Operation

Cooling Model

Operating mode Cooling Cooling Healthy Dehumidification Heating

Indoor Fan Speed

Setting Temperature

High High High High

22°C22°C23°C24°C

Room Temp. ≥ 24°C21°C ≤ Room Temp. < 24°C Room Temp. < 21°C

Heat pump Model

• While in forced operation, the key input by the remote control has no effect and the buzzer sounds 10 times to
indicate the forced operation.

■ Test operation

•

During the TEST OPERATION, the unit operates in cooling mode at high speed fan, regardless of room tem­perature and resets in 18±1 minutes.

•

During test operation, if remote controller signal is received, the unit operates as remote controller sets.
If you want to use this operation, open the front panel upward and Press the power button let it be pressed for
about 3 seconds.

•

If you want to stop the operation, re-press the button.

■ Protection of the evaporator pipe from frosting

• If the indoor pipe temp is below 0°C in 7 min. after the compressor operates without any pause while in cooling

cycle operation mode, the compressor and the outdoor fan are turned off in order to protect the indoor evapo­rator pipe from frosting.

• When the indoor pipe temp is 7°C or higher after 3 min. pause of the compressor, the compressor and the out-

door fan is turned on according to the condition of the room temperature.

■ 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.

• When a key is input by the remote control while the slide switch on the main unit of the appliance is on the

forced operation position, the error sound "beep-beep-beep-beep-beep-" is made 10 times to indicate that the
remote control signal cannot be received.

Service Manual 31

Operation

■ Air Cleaner Operation

• When an air cleaner function is selected during Air Conditioner operation

- Plasma air cleaner 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.

• When an air cleaner function is selected during operation off

- The function will be only operated.

• When inlet grille of air conditioner is opened during plasma operation, High Voltage Generator(H.V.B) is to be
stopped. When inlet grille of air conditioner is closed during plasma operation, High Voltage Generator(H.V.B)
will be operated again.

32 Room Air Conditioner

Display Function

1. Heating Model 2. Cooling Model

Operation

Operation Indicator

• Cooling, Soft Dry, Fan, Heating • Cooling, Soft Dry, Fan

Sleep Timer Indicator

• Sleep Mode • Sleep Mode

Timer Indicator

• Timer Mode • Timer Mode

Defrost Indicator

• Hot-start, Defrost

PLASMA Indicator

• PLASMA Mode • PLASMA Mode

Operation Indicator

Sleep Timer Indicator

Timer Indicator

Outdoor Unit Operation

PLASMA Indicator

Service Manual 33

Operation

3sec 3sec 3sec

(once)

Self-diagnosis Function

Error

Code

1

Error Display LED

(Indoor body operation LED)

Error contents

• Indoor room temperature
thermistor open/short

• Indoor pipe temperature
thermistor open/short.

SVC check point

• Indoor Thermistor
assembly check

34 Room Air Conditioner

Remote Control Operations

ON

OFF

CANCEL

SET

1

3

5

4

9

10

12

14

16

7

2

8

13

15

11

6

Cooling Operation

Auto Operation or Auto Changeover

Healthy Dehumidification Operation

Flip-up door
(opened)

Heating Operation

Signal transmitter

•

Cooling Model( ), Heat Pump Model( )

17

AUTO CLEAN

The controls will look like the following.

Controls

Operation Mode

Operation

1. 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.

3. ROOM TEMPERATURE SETTING BUTTONS

Used to select the room temperature.

4. INDOOR FAN SPEED SELECTOR

Used to select fan speed in four steps
low, medium, high and CHAOS.

5. JET COOL/HEATING(OPTIONAL)

Used to start or stop the speed
cooling. (Speed cooling/heating operates at super
high fan speed in cooling/heating mode.)

6. CHAOS SWING BUTTON

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

7. 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.

10. SLEEP MODE AUTO BUTTON

Used to set Sleep Mode Auto operation.

11. AIR CIRCULATION BUTTON

Used to circulate the room air without cooling or
heating.

12. ROOM TEMPERATURE CHECKING BUTTON

Used to check the room temperature.

13. NANO PLASMA(OPTIONAL)

Used to start or stop the plasma-purification
function.

14. HORIZONTAL AIRFLOW DIRECTION CONTROL
BUTTON
(OPTIONAL)

Used to set the desired horizontal airflow direction.

15. RESET BUTTON

Used prior to resetting time or after replacing bat­teries.

16. 2nd F Button

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

17.

AUTO CLEAN(OPTIONAL)

Used to set Auto Clean mode.

Service Manual 35

Disassembly

Step Motor Connectors

Sensor Connector

Comp Connector

4Way/Fan Connector

Motor
Connector

Power Connector

Power Connector

Comp Connector

Panel Front

Connector

Disassembly

Indoor Unit

WARNING:

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.

36 Room Air Conditioner

3. To remove the Evaporator.

Top Cover

Pipe Cover

Air Guide

Turbo Fan

Bracket

Bolt Motor Mount

- 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.

Disassembly

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.

Service Manual 37

Schematic Diagram

INT

S78DL05L,1W(DIP)

FAN

MOTOR

6

5

BL

WH

6

5

77

YL

IN DOOR

321

4

1

RD

BK

4

2

3

1

2

1

2

R10D

4.7K 1%

5.1K

R11D

25V

R12D

ZD02D

6.8V

10K

C10D

100UF

1N4148

Q02G

KRA101M

PC-17K1

PC-17K1

IC07D

4.7K 1%

D05D

R08D

1

2

4

3

IC06D

4

3

1

2

C11D

473

630V

(TM)

CN-MOTOR1(WH)

DC 311V

KRA101M

Q01G

PC-17K1

4

3

1

2

IC05D

4(f)

SLEEP

TIMER

LED3

DEFROST

ON/OFF

LED1

LED4

LED2

LED3

PLASMA

PLASMA

PLASMA

LED1

3(a)

1(g)

9(b)

6(d)

8(c)

7(e)

Digit1

10

Digit2

e

c

d

5

afg

b

LED2

Hall Sensor1

5V

PWM

12V

ON/OFF

5V

IC01D BP

1/2W

CY1~2

471M

C02N

(DIP)

275VAC

0.22uF

DC311V

3216

1/4W

3216

1/4W

R02D

32

PC-17K1

1

4

IC03D

54

27

8

R08D 1K

22

19

20

21

17

18

24

25

26

23

13

14

15

16

9

10

11

12

61

3

5

4

6

7

1

2

62

64

63

58

59
60

56

55

57

29

28

32

30

31.

39

35

34

33

36

40

41

38

37

44

43

42

46

45

51

52
53

49

48

50

47

R09D 1K

1/2W

C01N

(DIP)

275VAC

0.22UF

250V/T3.15A

15mH/1.5A

N/F01N

TVR10561

ZNR01N

(DIP)

FUSE

5543

4

3

R03D

C10D

103

50V

1

2

1

2

HVB ASSY

CN-HVB(BL)

33

PKM13EPP-4002

5V

R02L

1K

R02A 20K

220uF

C07D

25V

+

IC04D

50V

104

C08D

C04D

50V

104

7805

10V

220uF

C03L

+

Q01C

R12H

10K

5V

22

22

33

33

22

11

33

1

1

33

22

12uH(DIP)

L3

CN-12V(WH)

12

11

13 13

12

11

+15V

HVB PIN1

HVB

11

1212

11

1313

12V

CN-D5

CN-D3

RECEIVER

Vout

Vcc

GND

0.01

C04L

25V

14

14

15

14

15

14

15

14

1111

12

10

1111

12

10

1313

12

11

10

13

121113

10

5555

77

99

88

66

798

6

7

9

8

6

22113

4

3

4

2

1

2

1

4

3

4

3

흡입구 1

STEPPING MOTOR

DISPLAY

3

3

TEST

CN-MAIN

KEY

33

22

22

3

3

1

2

1

PK BL

2

1111

5

4

RD

OR

YL

5

4

CN-CON(WH)

10 10

CN-D1

11

10 10

11

66

9

88

9

77

4

33

4

5

22

5

CN-D2

11

receiver

HVB PIN2

10 10

CN-D1(WH)

1111

1010

66

7

8

9

8

7

9

10V

5V

220

C02L

3

4

5

354

22

CN-D2(WH)

11

Q04C

12V

Q03C

Q02C

3 3

CN-D2 8PIN

CN-D2 7PIN

CN-SW(BL)

88

99

6

5

44

5

6

77

SUB PCB ASM

CN-D1

1

2

1

2

33

88

99

4

5

6

465

77

CN-D1(WH)

1

2

1

2

R14D 1K

R13D 1K

SMPS

VOLTAGE GND

GND

D03D

1K

ZD01D

BZX55C11

VOLTAGE GND

DC LOW

CY3

103 (DIP)

CY4

DC HIGH

PC-17K1

1/4W

R06D

39

1K

R07D

6

4

1

3

12uH(DIP)

IC02D

C09D

104

470uF

25V

C04D

+

UG2D

10K

R29H

220uF

35V

C03D

+15V

10K

R16D

OJ01H

OJ02H

R28H 20K

UG2D

D02D

470uF

C02D

R13D

L1

1K

1/2W

12uH(DIP)

R05D

+

L2

+

35V

PWM

C11H

50V

103

10K

R30H

CN-ACDC2

CN-ACDC1

1

1

103

50V

C12H

TNY266P

1

S

BP

2

IC01D

4

D

EN

5

1N4937

D07D

150uF

450V

C01D

+

560K

R04D

D3SBA60

BD01D

(DIP)

10

10

OUT

ON

12V

103

C14D

110K

R14D

H/S1

OFF

H/S2

SCK-084

NTC

INT5V COMP

OR3H

6

6

2

2

3

3

4

4

5

5

Hi

OR5H

S-Hi

OR6H

Med

OR4H

7

7

INT

9

9

8

8

OR2H

Low

F2

L3

F1

OR1H

300K

D01D

1N4007

4WAY O2

300K

R01D

D04D

1N4148

12

12

11

11

5V

E2 1K

E3 1K

12

5

0IMCRNE002M

uPD780023AGC

digit 1

LED scan

digit 2

PLASMA

103

R27H 20K

1K

R11H

103

C13H

50V

18

3645

27

on/off

Q08C

Q07C

Q06C

Q05C

5V

5V

20K

R02P

20K

R01P

TXD

RXD

5V

C01M

103

C02M

VssO

Vdd0

AVss

AVdd1

ULN2004AFW

ULN2004AFW

IC01M

R07G 510

R06G 510

R05G 510

R04G 510

R03G 510

R02G 510

R01G 510

13

14

16

15

4

3

1

2

12V

9

10

12

11

8

7

5

6

12V

RY-COMP

RY-O2

15

14

12

11

13

6

5

4

3

2

IC02M

10

9

7

8

bdc

efg

a

CN-UD(BL)

1

3 4

2

HVB

16

3

4

13

15

5

14

5V

5V

AVdd

AVret

RESET

X1

X2

R26H

R21H~R26H

12.1K 1%

R21H

R22H

R24H

R23H

R25H

5V

C01A

50V

103

3

330

R01A

1K

CST-8.00MTW

OSC01B

R01B

1M

50V

5.1K

R01L

C01L

680pF

12V

INT1

INTO

Vss1

ULN2004AFW

76

8

IC04M

1

2

1011 9

PWM

RY-FAN

4-WAY

1K

E1

R02E 20

R01E

BZ01E

33

R02H

R04H

R01D

1M

11

CN-POW1

11

RY-FAN

RY-COMP

RY-O2

G4A-1A

RY-4WAY

R05H

10K

1%

6.2K

OPTION

1%

12.1K

T/BLOCK

CN-POW2

3

4

1

2

1

2

50/60Hz

AC220-240V

22

11

PIPE-TH

HVB PIN2

HVB PIN1

R04D

KSC7536

KIA7036P

2

IC01A

1

3.6V

220

10V

5V

5V

+

C02A

receiver

56K

R05D

KTC3198Y

Q01D

47K

10K

CN-TH1(WH)

44

ROOM-TH

INT

ULN2004AFW

11

6

8

9

12

13

14

5

4

3

IC03M

RD

33

CN-LR2(WH)

5V

11

22

12V

4

55

4

YL

L / R 2

STEP MOTOR

OR

STEP MOTOR

L / R 1

PKBL

RD

55

4421

3

132

CN-LR1(WH)

BL

OR

YL

PK

STEPPING MOTOR

상하 토출구

OR

3

4

YL

5

BL PK

2

1

RD

5V

103

C12D

KRA223S

KRC107S

20K

R01P

R02P

20K

R03P

20K

5V

5V

CN-O2

1 1

Schematic Diagram

Electric Control Device

• Heat Pump Model

38 Room Air Conditioner

Wiring Diagram

Indoor Unit

Schematic Diagram

Outdoor Unit

AS-H076PB/D/M/WL1 AS-H096PB/D/M/WL1

AS-H126PB/D/M/WL1

Service Manual 39

Schematic Diagram

CN-MOTOR2

R07D

R01D

PWB : 6870A90161D

CN-O2

GND

3

4

T/BLOCK

1(L)

2(N)

CN-COMP

CN-OUT

RY-FAN

RY-4WAY

CN-POW1

RY-O2

ZNR01N

CN-COM

FUSE

RY-COMP

4

3

CN-POW2

R15D

250V-T3.0A

250V-T3.15A

125V-T3.15A

PWB ASM : 6871A10121

C01N

-

NF01N

D01D

CN-GND1

C01D

BD01D

+

~

~

CY1

CY2

NTC

R03D

R02D

IC01D

C02N

C09D

D07D

C14D

IC02D

CY4

R04D

IC03D

CY3

D04D

1

C11D

SMPS

R14D

IC06D

ZD01D

D02D

C02D

D03D

R13D

R06D

CY5

L1

IC05D

C04D

C12D

ZD02D

C03D

R05D

CN-MOTOR1

1

L3

R16D

C10D

Q02G

Q01G

R12D

R10D

L2

IC08DIC07D

CN-ACDC1

R08D

D05D

D06D

R09D

R11D

Components Location

MAIN P.W.B ASSEMBLY (AC PART)

• HEAT PUMP MODEL

MAIN P.W.B ASSEMBLY (DC PART)

• TOP VIEW • BOTTOM VIEW

40 Room Air Conditioner

DISPLAY ASSEMBLY

– 6871A20462

TOP VIEW

BOTTOM VIEW

Schematic Diagram

SUB P.W.B ASSEMBLY

1

1

1

1

CN-D3

CN-D1

CN-D5

CN-D6

CN-D4

1

1

1

CN-D2

CN-D8

CN-CON(WH)

CN-D7

1

1

PWB ASM:6871A20363

PWB:6870A90126B

CN-12V(WH)

11

CN-SW(BL)

1

C02V

C01V

Service Manual 41

Troubleshooting Guide

INDOOR UNIT OUTDOOR UNIT

INDOOR UNIT OUTDOOR UNIT

HEAT
EXCHANGE
(EVAPORATOR)

HEAT
EXCHANGE
(EVAPORATOR)

HEAT
EXCHANGE
(CONDENSER)

HEAT
EXCHANGE
(CONDENSER)

COMPRESSOR

COMPRESSOR

ACCUMU
LATOR

GAS SIDE

GAS SIDE

3-WAY VALVE

LIQUID SIDE

LIQUID SIDE

3-WAY VALVE

CAPILLARY TUBE

CAPILLARY TUBE

CHECK VALVE

(Heating Model only)

COOLING

HEATING

REVERSING
VALVE
(Heating Model Only)

Troubleshooting Guide

Refrigeration Cycle Diagram

(1) Cooling Only Models

(2) Cooling & Heating Models

42 Room Air Conditioner

2-way, 3-way Valve

Valve cap

Open position
Closed position

Pin

Service
port

Service
port cap

To outdoor unit

Flare nut

To
piping
connection

To outdoor unit

Hexagonal wrench (4mm)

Open position
Closed position

To
piping
connection

Flare nut

Troubleshooting Guide

2-way Valve (Liquid Side) 3-way Valve (Gas Side)

Works

Shipping

Air purging

1.

(Installation)

Operation

Pumping down

2.
(Transfering)

Evacuation

3.

(Servicing)

Gas charging

4.

(Servicing)

Pressure check

5.

(Servicing)

Gas releasing

6.
(Servicing)

Shaft position Shaft position Service port

Closed Closed Closed

(with valve cap) (with valve cap) (with cap)

Open Closed Open

(counter-clockwise) (clockwise) (push-pin or with

vacumm pump)

Open Open Closed

(with valve cap) (with valve cap) (with cap)

Closed Open Open

(clockwise) (counter-clockwise) (connected manifold

gauge)

Open Open Open

(with charging

cylinder)

Open Open Open

(with charging

cylinder)

Open

(with charging cylinder)

Open

(with charging cylinder)

Service Manual 43

Open Open

Open Open

Troubleshooting Guide

Lo

Closed

Purge the air

Outdoor unit

Indoor unit

Liquid side

Gas side

CLOSE

Open

2-Way
valve

3-Way
valve

CLOSE

Pumping Down

• Procedure

(1) Confirm that both the 2-way and 3-way 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

(4) Air purging of the charge hose.

(5) Set the 2-way valve to the closed position.

connect the charge set to the service port of
the 3-way valve.

– Connect the charge hose with the push pin to

the service port.

– Open the low-pressure valve on the charge set

slightly to air purge from the charge hose.

(6) Operate the air conditioner at the cooling

cycle and stop it when the gauge indicates
1kg/cm2g.

(7) Immediately set the 3-way valve to the closed

position.

– Do this quickly so that the gauge ends up indi-

cating 3 to 5kg/cm2g.

(8) Disconnect the charge set, and mount the 2-

way and 3-way valve’s stem nuts and the ser­vice port nut.

– Use torque wrench to tighten the service port

nut to a torque of 1.8 kg.m.

– Be sure to check for gas leakage.

44 Room Air Conditioner

Balance Refrigerant of the 3-way Valve

Lo

Open

Open

3-Way
valve

3-Way
valve

Gas side

CLOSEOPEN

Outdoor unit

Liquid side

Indoor unit

(Gas leakage)

Troubleshooting Guide

• Procedure

(1) Confirm that both the 2-way and 3-way valves

are set to the back seat.

(2) Connect the charge set to the 3-way valve’s

port.

– Leave the valve on the charge set closed.
– Connect the charge hose to the service port.

(3) Open the valve (Lo side) on the charge set and

discharge the refrigerant until the gauge indi­cates 0 kg/cm2G.

– If there is no air in the refrigerant cycle (the

pressure when the air conditioner is not running
is higher than 1 kg/cm2G), discharge the refrig­erant until the gauge indicates 0.5 to 1

2

kg/cm
sary to apply a evacuatin.

– Discharge the refrigerant gradually; if it is dis-

charged too suddenly, the refrigeration oil will
also be discharged.

G. if this is the case, it will not be neces-

Service Manual 45

Troubleshooting Guide

Lo

Open

Open

Vacuum pump

3-Way
valve

Outdoor unit

Liquid side

Indoor unit

Gas side

3-Way
valve

CLOSE

OPEN

Evacuation

(All amount of refrigerant leaked)

• Procedure

(1) Connect the vacuum pump to the center hose

of charge set center hose

(2) Evacuation for approximately one hour.

– Confirm that the gauge needle has moved

toward -76 cmHg (vacuum of 4 mmHg or less).

(3) Close the valve (Lo side) on the charge set,

turn off the vacuum pump, and confirm that
the gauge needle does not move (approxima­tely 5 minutes after turning off the vacuum
pump).

(4) Disconnect the charge hose from the vacuum

pump.

– Vacuum pump oil.

If the vacuum pump oil becomes dirty or
depleted, replenish as needed.

46 Room Air Conditioner

Gas Charging

(After Evacuation)

Troubleshooting Guide

Indoor unit

Check valve

Charging
cylinder

Lo

(1)

OPEN

• Procedure

(1) Connect the charge hose to the charging

cylinder.

– Connect the charge hose which you dis-con-

nected 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.

Liquid side

Gas side

CLOSE

3-Way

Open

valve

Open

3-Way
valve

\

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.

(4) Immediately disconnect the charge hose from

the 3-way valve’s service port.

– Stopping partway will allow the gas to be dis-

charged.

– If the system has been charged with liquid

refrigerant while operating the air conditioner
turn off the air conditioner before disconnecting
the hose.

Outdoor unit

(3) Open the valve (Lo side on the charge set and

charge the system with liquid refrigerant.

– If the system can not be charged with the spec-

ified 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).

(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.

– Be sure to check for gas leakage.

Service Manual 47

Troubleshooting Guide

NOTICE

NOTICE

Cycle Parts

Trouble analysis

1. Check temperature difference between intake and discharge air and operating current.

Temp. difference : approx. 0°C
Current : less than 80% of

rated current

Temp. Difference

Operating Current

Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relativery 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.

Temp. difference : approx. 8°C
Current : less than 80% of

rated current

Temp. difference : less than 8°C
Current : over the reated

current

Temp. difference : over 8°C

• All amount of refrigerant leaked
out. Check refrigeration cycle.

• Refrigerant leakege

Clog of refrigeration cycle
Defective compressor

• Excessive amount of refrigerant

• Normal

Suction pressure Temperature

(Compared with (Compared with Cause of Trouble Description

the normal value) the normal valve)

High

Higher

Normal refrigerant rise at the beginning of

Lower Higher refrigerant (Leakage)

1. The suction pressure is usually 4.5~6.0 kg/cm2G(Cooling) at normal condition.

2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with
putty.

Defective compressor Current is low.
Defective 4-way reverse valve

Excessive amount of High pressure does not quickly

operation.

Insufficient amount of Current is low.

Clogging Current is low.

48 Room Air Conditioner

Electronic Parts

Product does not operate at all.

(* Refer to Electronic Control Device drawing and Schematic diagram.)

Turn off Main Power

(After 10 seconds)

Turn on Main Power

Does "beeping" sound is made from the Indoor Unit?

Troubleshooting Guide

NO

Check the voltage of power(About AC 220V, 60Hz)

(About AC 220/240V, 50Hz)

• Main power's voltage

• Voltage applied to the unit

• Connecting method of Indoor/Outdoor connecting

cable

• Check PWB Assembly

- Fuse

- Pattern damage

- Varistor(ZNR01N)

Check the connection housing for contacting

• Connector related to CN-POWER1, 2

• Connector related to CN-MOTOR

• Connector contacting of Outdoor Fan/Compressor

• Display PWB Assembly Check

YES

Primarily, the operating condition of Micom is OK.

Check each load(Indoor/Outdoor Fan Motor,
Compressor, Stepping Motor) and contacting
condition of related connector

Items

• SMPS Transformer
(Indoor unit)

- Input Voltage

- Output Voltage

• IC04D(7805) Output

• IC01A(Reset IC)

OSC01B(8MHz)

Main PCB Board Operation Check

Content Remedy

- About AC220V/240V±10% - Check the power voltage

- About DC12V

• DC +5V

• Voltage of Micom No. 36,

(DC +4.5V over) and Soldering condition.

• Replace Trans

• Replace IC04D

• Replace faulty parts

Service Manual 49

Troubleshooting Guide

The product does not 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 by force.)

Cause by the remote control

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

Check the connecting circuit between the remote controller
MICOM (No. 30 ) - R17(2Ω) - IR LED - TR - R16(2.2KΩ).

Caused by other parts except the remote control

Check the contact of CN-D1, 2 connector.

Check Display PWB Assembly

- Voltage between CN-D2 - : DC +5V

Check point

• Check the connecting circuit between PIN ­R02L(1K) - C01L(680PF) - MICOM PIN

• Check Receiver Assembly

43

50 Room Air Conditioner

Compressor/Outdoor Fan are unable to drive.

Turn on Main Power

Operate "Cooling Mode( )" by setting the desired 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 attached as close as to be
effected by the temperature of Heat Exchanger(EVA).

Troubleshooting Guide

When the sensor circuit for indoor temperature and connector are in bad
connection or are not engaged, Compressor/Outdoor Fan is stopped.

• Check R02H(12.1k), R04H(6.2k), Micom Pin

26

,

27

• Check the indoor temperature sensor is disconnected or not(About 10kΩ / at 25°C).

Check Relay(RY - COMP) for driving compressor.

• When the power(About AC220V/240V) is applied to the connecting wire
terminal support transferred to compressor, PWB Assembly is normal.

• Check the circuit related to the relay.

Check point COMP ON COMP OFF

Between Micom(No.

63) and GND

Between IC02M(No. 14) Below DC 1V

and GND (app)

DC5V DC0V

About DC12V

Turn off Main Power

• Check the electrical wiring diagram of outdoor side.

• Check the abnormal condition for the component of

Compressor/Outdoor Fan Motor.

• Check the "open" or "short" of conmecting wires between indoor and
outdoor.

Service Manual 51

Troubleshooting Guide

When Indoor Fan does not operate.

Turn off Main power

Check the connection of CN-MOTOR1, 2

Check the Fan Motor

Check the Fuse(AC250V/3.15A)

- Check PWM signal from Micom Pin 50

- Check On/Off signal from micom pin14.

- Check Voltage of CN-Motor 1, 2
(pin ~ is about 15V)

Turn ON Main Power

Fan can't operate for dehumidifying mode.

- Change operation for cooling mode.

52 Room Air Conditioner

When Louvers do not operate.

• Confirm that the Louver is normally geared with the shaft of Stepping
Motor.

• If the regular torque is detected when rotating the Louver with hands
Normal

• Check the connecting condition of CN-UD, LR1, LR2 Connector.

• Check the soldering condition(on PWB) of CN-UD LR1, LR2 Connector.

Check the operating circuit of the Louvers.

• Confirm that there is DC +12V between pin of CN-UD and GND.

• Confirm that there is a soldering short at following terminals.

-

Between , , , , , , , , , , , of MICOM

- Between

- Between ,

- Between , , , , , , , of IC04M

- Between , , , of CN-UD/LR1/LR2

45 46 47 48 54 55 56 57 59 60 61 62

Troubleshooting Guide

of IC02M

of IC03M

If there are no problems after above checks

• Confirm the assembly conditions that are catching and interfering parts
in the rotation radial of the Louvers.

Service Manual 53

Troubleshooting Guide

When Heating does not operate

Operate “Heating Mode( )” by setting the desired temperature of the
remote control is higher than one of the indoor temperature by 2°C at
least.

In heating Mode, the indoor fan operates in case the pipe temperature
is higher than 28°C.

Check the connector of intake and pipe sensor(thermistors)

Turn ON Main Power

• Check the related circuit of RY-4WAY

• Check the indoor room temperature is disconnected or not (about

10KΩ/at 25°C).

• Check the indoor pipe temperature is disconnected or not (about

5KΩ/at 25°C).

Check the DC voltage on the PWB ASSEMBLY

• The details of check are as followings

• Comp Relay.

Check point

Between Micom

(NO.63) and GND

Between IC02M

(NO.14) and GND

Comp ON

DC 5V

Below DC 1V

Comp OFF

DC 0V

About DC

12V

• 4 way Relay

• Outdoor fan Relay

Check point

Between Micom

(NO.53) and GND

Between IC03M

(NO.11) and GND

Fan ON

DC 5V

Below DC 1V

Fan OFF

DC 0V

About DC 12V

Check point

Between Micom

(NO.51) and GND

Between IC03M
(No.9) and GND

4 way ON

Below DC1V

54 Room Air Conditioner

DC 5V

4 way OFF

DC 0V

About 12V

Troubleshooting Guide

Turn off Main Power

• Check the electrical wiring diagram of outdoor side.

• Check the abnormal condition for the component of

Compressor/Outdoor Fan Motor, 4 way.

• Check the "open" or "short" of connecting wires between indoor and
outdoor.

Service Manual 55

Exploded View

359012

264110

135515

267110

135500-3

349600

135500-2

135311-1

146811

147581

330870

135311-3

146811

346810

135500-1

146811

135311-2

131410

352380

352150

35211B

263230

147581

152302

135314

268712

268717

135312

354210

144710-2

146811

146811

144710-1

147581

352116

352115

249951

268714-1

159830

268714-2

Exploded View

Indoor Unit

56 Room Air Conditioner

554031

437212

435511

W0CZZ

552202

567502

552116

552201

554160

561410

552111

550140

552203-1

552203-2

430410

447910

649950

552102-2

552102-1

437210

435301

559010

546810

Outdoor Unit (AS-H076PB/D/M/WL1)

Exploded View

Service Manual 57

554031

437212

435511

W0CZZ

552202

567502

552116

552201

554160

561410

552111

550140

552203-1

552203-2

430410

447910

649950

552102

437210

435301

559010

546810

Exploded View

Outdoor Unit (AS-H096PB/D/M/WL1, A-12AH..

58 Room Air Conditioner

Replacement Parts List

Replacement Parts List

Indoor Unit

LOCATION

No.

131410 CHASSIS ASSEMBLY 3141A20004N 3141A20004D 3141A20004N R

135303 GRILLE,INLET 3530A20077F 3530A20077F 3530A20077F R

135311-1 GRILLE ASSEMBLY,DISCHARGE(INDOOR) 3531A20069G 3531A20069G 3531A20069G R

135311-2 GRILLE ASSEMBLY,DISCHARGE(INDOOR) 3531A20069H 3531A20069H 3531A20069H R

135311-3 GRILLE ASSEMBLY,DISCHARGE(INDOOR) 3531A20069J 3531A20069J 3531A20069J R

135312 GRILLE ASSEMBLY,FRONT(INDOOR) 3531A20213E 3531A20213E 3531A20213E R

135314 GRILLE ASSEMBLY,INLET 3531A20212E 3531A20212E 3531A20212E R

135500-1 COVER 3550A20123A 3550A20123A 3550A20123A R

135500-2 COVER * * 3550A20124A R

135500-3 COVER 3550A20060A 3550A20060A 3550A20060A R

135515 COVER ASSEMBLY,TOP(INDOOR) 3551A20031B 3551A20031B 3551A20031B R

146811 MOTOR ASSEMBLY,STEP 4681A20055A 4681A20055A 4681A20055A R

147581 LOUVER,HORIZONTAL 4758A20014B 4758A20014B 4758A20014B R

152302 FILTER(MECH),A/C 5230A20032A 5230A20032A 5230A20032A R

159830 AIR CLEANER ASSEMBLY 5983A20007F 5983A20007F 5983A20007F R

249951 CONTROL BOX ASSEMBLY,INDOOR 4995A20372Q 4995A20372E 4995A20372A R

263230 THERMISTOR ASSEMBLY 6323A20004N 6323A20004N 6323A20004N R

264110 POWER CORD ASSEMBLY 6411A20014S 6411A20014S 6411A20014S R

267110 REMOTE CONTROLLER ASSEMBLY 6711A20073Z 6711A20073Z 6711A20073Z R

268712 PWB(PCB) ASSEMBLY,DISPLAY 6871A20462A 6871A20462A 6871A20462A R

268714-1 PWB(PCB) ASSEMBLY,MAIN 6871A10121A 6871A10121A 6871A10121A R

268714-2 PWB(PCB) ASSEMBLY,MAIN(DC) 6871A20439J 6871A20439D 6871A20439C R

268717 PWB(PCB) ASSEMBLY,SUB 6871A20363D 6871A20363D 6871A20363D R

330870 DRAIN PAN ASSEMBLY 3087A30004A 3087A30004A 3087A30004A R

346810 MOTOR ASSEMBLY,INDOOR 4681A20091A 4681A20091A 4681A20091A R

352115 TUBE ASSEMBLY,EVAPORATOR IN * * 5211A20302B R

352116 TUBE ASSEMBLY,EVAPORATOR OUT * * 5211A20301B R

35211B TUBE ASSY,TUBING 5211AR7066F 5211AR7066F 5211AR7066D R

352150 HOSE ASSEMBLY,DRAIN 5251AR1222R 5251AR1222R 5251AR1222R R

352380 AIR GUIDE 5238A20020A 5238A20020A 5238A20020A R

354210 EVAPORATOR ASSEMBLY,FIRST 5421A20072A 5421A20072A 5421A20072A R

359012 FAN,TURBO 5900A00003A 5900A00003A 5900A00003A R

DESCRIPTION

AS-H076PB/D/M/WL1 AS-H096PB/D/M/WL1 A-12AH series

PART No.

REMARKS

NOTE) *Please ensure GCSC since these parts may be changed depending upon the buyer's request.

(GCSC WEBSITE http://[e-mail])

Service Manual 59

Replacement Parts List

Outdoor Unit

LOCATION

No.

430410 BASE ASSY,OUTDOOR 3041A20016A 3041A20008K 3041A20008K R

435301 GRILLE,DISCHARGE * 3530A20006B 3530A20006B R

435511 COVER ASSEMBLY,CONTROL(OUTDOOR) 3551A30023Q 3551A30023E 3551A30023E R

437210 PANEL ASSEMBLY,FRONT(OUTDOOR) 3720A10171A 3721A20027B 3721A20027B R

437212 PANEL ASSY,REAR(OUTDOOR) 3720A10172A 3721A20026B 3721A20026A R

447910 BARRIER ASSEMBLY,OUTDOOR 4790A10025B 4791A30002A 4791A30002A R

546810 MOTOR ASSEMBLY,OUTDOOR 4681A20121A 4681A20004S 4681A20004S R

550140 ISOLATOR,COMP 4H00982E * 4H00982E R

552111 TUBE ASSEMBLY,CAPILLARY 5211A21121B 5211A30331Q 5211A20117J R

552116 TUBE ASSEMBLY,REVERSING 5211A20188U 5211A20160E 5211A20140X R

552201 VALVE,CHECK 5220AR7182A 5220AR7182A 5220AR7182A R

552202 VALVE,REVERSING 5220AR3228D 5220AR3228B 5220AR3228D R

552203-1 VALVE,SERVICE 2H02479P 2H02479H 2H02479H R

552203-2 VALVE,SERVICE 5220A20001B 5220A20001B 5220A20006B R

554031 CONDENSER ASSEMBLY,BENT 5403A20045M 5403A20019F 5403A20019V R

554160 COMPRESSOR SET 2520UGDP2CA 2520UGAP2GA 2520UGHP2AA R

559010 FAN ASSEMBLY,PROPELLER 5900AR1266A 5901A10004A 5901A10004A R

561410 COIL ASSEMBLY,REVERSING VALVE 6141A20017A 3A02028Y 6141AR3733R R

649950 CONTROL BOX ASSEMBLY,OUTDOOR 4995A10032B 4995A20083B 4995A20083Y R

W0CZZ CAPACITOR,DRAWING 6120AR2194H 6120AR2194N 2H01451T R

DESCRIPTION

AS-H076PB/D/M/WL1 AS-H096PB/D/M/WL1 A-12AH series

PART No.

REMARKS

NOTE) *Please ensure GCSC since these parts may be changed depending upon the buyer's request.

(GCSC WEBSITE http://biz.LGservice.com)

60 Room Air Conditioner

Memo

Service Manual 61

Memo

62 Room Air Conditioner

P/No.: 3828A20135S

February, 2004

Printed in Korea