service eng la140ce 20120307154958
website http://www.lgservice.com
LG
LG Room
Air Conditioner
SERVICE MANUAL
MODELS: LA140CE
CAUTION
• 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..................................................................................................................................................9
Outdoor Unit...............................................................................................................................................9
Product Specifications ................................................................................................................................10
Installation .....................................................................................................................................................11
Select the Best Location .........................................................................................................................11
Piping Length and Elevation.....................................................................................................................11
Fixing Installation Plate ............................................................................................................................12
Drill a Hole in the wall...............................................................................................................................12
Flaring Work.............................................................................................................................................13
Connecting the Piping ..............................................................................................................................14
Connecting the Cables .............................................................................................................................19
Connection method of the connecting cable(Example)............................................................................20
Connect the cable to the indoor unit.........................................................................................................21
Checking the Drainage.............................................................................................................................22
Forming the Piping ...................................................................................................................................23
Air Purging ...............................................................................................................................................24
Test Running ............................................................................................................................................26
Operation ......................................................................................................................................................28
Function of Controls .................................................................................................................................28
Display Function.......................................................................................................................................34
Self-diagnosis Function............................................................................................................................34
Remote Control Operations......................................................................................................................35
Disassembly ..................................................................................................................................................36
Indoor Unit................................................................................................................................................36
Schematic Diagram.......................................................................................................................................39
Electric control Device..............................................................................................................................39
Wiring Diagram.........................................................................................................................................41
Components Location ..............................................................................................................................42
Troubleshooting Guide .................................................................................................................................46
Refrigeration Cycle Diagram ....................................................................................................................46
2-way, 3-way Valve ...................................................................................................................................47
Cycle Parts...............................................................................................................................................52
Electronic Parts ........................................................................................................................................53
Exploded View & Replacement Parts List .................................................................................................62
Indoor Unit...............................................................................................................................................63
Outdoor Unit............................................................................................................................................64
2 Room Air Conditioner
LG Model Name
2003
1
Code
2
-
3
Type
4
5
6
Code of Model
7
8
9
10
Meaning
1
Producing Center,
Refrigerant
A~Z
L: Chang-won R22
A: Chang-won R410A
C: Chang-won R407C
T: China
K: Turkey R22
E: Turkey R410A
H: Thailand
N: India
Z: Brazil
D: Indonesia
M: Mexico
V: Vietnam
S: Out Sourcing
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
4, 5
Capacity
0~9
Cooling/Heating Capacity
Ex. "09" → 9,000 Btu/h
6
Electric Range
1~9
A~Z
1: 115V/60Hz,
2: 220V/60Hz
3: 208-230V/60Hz
5: 200-220V/50Hz
6: 220-240V/50Hz
7: 110V, 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
V: AC Inverter C/O
N: AC Inverter H/P
Q: DC Inverter C/O
W: DC Inverter H/P
A: 220V, 50Hz, 3Phase
B: 208~230V, 60Hz, 3Phase
C: 575V, 50Hz, 3Phase
D: 440~460, 60Hz, 3Phase
E: 265V, 60Hz
F: 200V, 50/60Hz
Basic
Basic+4Way
Plasma Filter
Plasma Filter+4 Way
Tele+LCD
Tele+LCD+Nano plasma+4Way
Nano Plasma F+(A/changeove)+A/clean+Low A
Nano Plasma F+(A/changeove)+A/clean+4way+Low A
Tele+LED+4way
Internet
Plasma F+4Way+Oxy generator
Nano Plasma F+(A/changeove)+A/clean
Nano Plasma F+(A/changeove)+A/clean+4way
Nano Plasma F+(A/changeove)+A/clean+PTC
Nano Plasma F+(A/changeove)+Autoclean+4way+PTC
Nano Plasma F+(A/changeove)+A/clean+4way+Low A+PTC
Negative ION+A/Clean
(Nano)Plasma+Negative ION+A/Clean
4way+(Nano)Plasma F+Negative ION+Healthy dehumidification+A/Clean
Nano Plasma F+4Way+(A/changeove)+A/clean+
A
B
C
D
E
F
G
H
I
J
K
L
M
N
P
Q
R
S
T
U
LG Model Development Serial No.
* ARTCOOL COLOR
R
Mirror
W
White
B
Blue
D
Wood
M
Metal
C
Cherry
Service Manual 3
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.
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.
• Otherwise, it may cause 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.
4 Room Air Conditioner
Don’t use a power cord, a plug or a loose socket
which is damaged.
• Otherwise, it may cause a fire or electrical shock.
Securely attach the electrical part cover to the
indoor unit and the service panel to the 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.
Safety Precautions
Always install an air leakage
breaker and a dedicated switching board.
Do not keep or use flammable
gases or combustibles near the
air conditioner.
• No installation may cause a fire and • Otherwise, it may cause a fire or
electrical shock.
the failure of product.
Ensure that an installation frame
of the outdoor unit is not damaged due to use for a long time.
• It may cause injury or an accident.
x
Wa Thinner
Do not disassemble or repair the
product randomly.
• It will cause a fire or electrical
shock.
Do not install the product at a
place that ther is concern of
falling down.
Use caution when unpacking and
installing.
• Otherwise, it may result in personal
injury.
• Sharp edges may cause injury.
Do not use the damaged power
cord.
Do not modify or extend the
power cord randomly.
■ Operation
Do not share the outlet with
other appliances.
• It will cause an electric shock or a
fire due to heat generation.
Take care so that the power cord
may not be pulled during operation.
• Otherwise, it may cause a fire or
electrical shock.
• 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.
• Otherwise, it may cause a fire or
electrical shock.
Keep the flames away.
• Otherwise, it may cause a fire.
Service Manual 5
Safety Precautions
Do not use the power cord near
the heating tools.
Do not open the suction inlet of
the indoor/outdoor unit during
operation.
• Otherwise, it may cause a fire or
electrical shock.
• Otherwise, it may cause a fire and
electrical shock.
• Otherwise, it may electrical shock
and failure.
Do not allow water to run into
electrical parts.
Hold the plug by the head when
taking it out.
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 the failure
of machine or electrical shock.
• It may cause electric shock and
damage.
Do not step on the indoor/outdoor unit and do 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.
6 Room Air Conditioner
Never touch the metal parts of
the unit when removing the filter.
• They are sharp and may cause
injury.
Do not place a heavy object on the power cord.
• Otherwise, it may cause a fire or electrical shock.
Take care so that children may not step on the outdoor unit.
• Otherwise, children may be seriously injured due to
falling down.
Safety Precautions
■ Installation
Install the drain hose to ensure that drain can be
securely done.
• Otherwise, it may cause water leakage.
Always inspect gas leakage after the installation
and repair of product.
• Otherwise, it may cause the failure of product.
Install the product so that the noise or hot wind
from the outdoor unit may not cause any damage
to the neighbors.
• Otherwise, it may cause dispute with the neighbors.
Keep level parallel in installing the product.
• Otherwise, it may cause vibration or water leakage.
■ Operation
Avoid excessive cooling and perform ventilation
sometimes.
• 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.
x
Wa Thinner
Do not use an appliance for special purposes such
as preserving animals vegetables, precision
machine, or art articles.
• Otherwise, it may damage your properties.
Do not place obstacles around the flow inlet or outlet.
• Otherwise, it may cause the failure of appliance or an
accident.
Service Manual 7
Dimensions
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.
NOTICE
This symbol indicates special notes.
Indoor Unit
H
D
W
Installation plate
MODEL
DIM
14K Btu Series
Unit
W
mm
1030
H
mm
290
D
mm
153
8 Room Air Conditioner
Dimensions
Outdoor Unit
L2
D
L1
W
H
L3
L5
Gas side
(3-way valve)
L4
Liquid side
(2-way valve)
DIM
MODEL
unit
14K Btu Series
W
mm
770
H
mm
540
D
mm
245
L1
mm
285
L2
mm
64
L3
mm
518
L4
mm
10
L5
mm
100
Service Manual 9
Product Specifications
Product Specifications
Table-1
Model Name
LA140CE
Item
Unit
Cooling Capacity
Btu/h
-
Heating Capacity
l/h
1.5
Ø, V, Hz
1Ø, 115V, 60Hz
Moisture Removal
Power Source
Indoor
Air Circulation
Outdoor
m3/min
Indoor
Noise Level
Outdoor
Input
Cooling
Heating
Running
Cooling
Current
Heating
E.E.R.
Cooling
C.O.P
Heating
dB (A)±3
Dimensions
(W x H x D)
Outdoor
A
Btu/hW
Outdoor
Refrigerant
41
48
13
10.0
-
W
mm
Indoor
Net. Weight
26
-
Indoor
Outdoor
9
1400
W
Indoor
Motor Output
14000
kg
g
Airflow Direction Control (Up & Down)
24
27
1030 x 290 x 153
770 x 540 x 245
9.5
35
900(R22)
O
L.C.D Wireless
Remocon Type
Liquid
Service Valve
Gas
inch(mm)
1/4(6.35)
1/2(12.7)
Sleeping Operation
O
Drain Hose
O
Connecting Cable(p*mm2)
18: 4*0.75
Power Cord(p*mm2)
14: 3*2.5
10 Room Air Conditioner
Installation
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.
3. Make sure that condensation drainage can be conveniently routed away.
4. Do not install near a doorway.
5. Ensure that the interval between a wall and the left (or right) of
the unit is more than 5cm(1.96"). The unit should be installed as
high as possible on the wall, allowing a minimum of 10cm(3.9")
from ceiling.
6. Use a stud finder to locate studs to prevent unnecessary damage to the wall.
More than
5cm(1.96")
More than 10cm(3.9")
More than
5cm(1.96")
More than
2.3m(7.5ft)
CAUTION: Install the indoor unit on the wall where the height from the floor is
more than 2 meters (6.6ft).
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 space around the back and sides is more
than 10cm(3.9"). The front of the unit should have more than
70cm(28") of space.
3. Do not place animals and plants in the path of the warm air.
4. Take the weight of the air conditioner into account and select
a place where noise and vibration are minimum.
5. Select a place where the warm air and noise from the air
conditioner do not disturb neighbors.
More than 60cm(24")
More than
10cm(3.9")
More than
10cm(3.9")
More than
60cm(24")
More than
70cm(28")
Piping Length and Elevation
Pipe Size
Capacity
(Btu/h)
GAS
LIQUID
Standard
Length (m)
14K
1/2"
1/4"
7.5(24.6ft)
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(16.4~23ft).
Additional
Max.
Max.
Elevation B (m) Length A (m) Refrigerant (g/m)
7(23ft)
15(50ft)
Indoor unit
20
Outdoor unit
Outdoor unit
A
B
A
Outdoor unit Indoor unit
Oil trap
B
A
Indoor unit
B
If piping length is more than 5m
Service Manual 11
Installation
Fixing Installation Plate
The wall you select should be strong and solid
enough to prevent vibration
Installation Plate
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.
CHASSIS
(Grade)
SU
(11k~14k)
(SU)
C
Installation plate
B
D
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.
Type "A" screw
A
Ø70mm(2.76")
Left rear piping
Distance (mm)
A
B
C
D
92
44
67
44
Ø70mm(2.76")
Right rear piping
Drill a Hole in the Wall
WALL
Outdoor
12 Room Air Conditioner
(3/16"~5/16")
Indoor
5-7mm
• Drill the piping hole with a ø70mm(2.76") hole core
drill. Drill the piping hole at either the right or the left
with the hole slightly slanted to the outdoor side.
Installation
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.
Copper
pipe
Slanted Uneven Rough
90°
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
Pipe
1. Completely remove all burrs from the cut cross section of
pipe/tube.
Reamer
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.
Point down
Flare nut
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)
Copper tube
Flaring work
2. Carry out flaring work with the flaring tool.
Outside diameter
mm
inch
Ø6.35
1/4
Ø9.52
3/8
Ø12.7
1/2
Ø15.88
5/8
Ø19.05
3/4
A
mm
0~0.5
0~0.5
0~0.5
0~1.0
1.0~1.3
Bar
Handle
"A"
1. Firmly hold copper pipe in a die in the dimension shown
in the table below.
Bar
Yoke
Cone
Copper pipe
Clamp handle
Red arrow mark
Service Manual 13
Installation
Check
Smooth all round
1. Compare the flared work with the figure by.
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.
Tubing holder 2
Tubing holder 1
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.
CAUTION: 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.
14 Room Air Conditioner
Tape
Connecting
pipe
Drain hose
Connecting cable
Installation
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.
Indoor unit tubing
Flare nut
Pipes
2. Tighten the flare nut with a wrench.
Outside diameter
mm
inch
Ø6.35
1/4
Ø9.52
3/8
Ø12.7
1/2
Torque
kg.m
1.8
4.2
5.5
3. When extending the drain hose at the indoor unit,
install the drain pipe.
Open-end wrench (fixed)
Flare nut
Wrench
Connection pipe
Indoor unit tubing
Drain pipe
Indoor unit drain hose
Adhesive
Wrap the insulation material around the connecting
portion.
Vinyl tape(narrow)
Plastic bands Insulation material
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.
Indoor unit pipe
Connection pipe
Wrap with vinyl tape
Vinyl tape (wide)
Connecting cable
Pipe
Vinyl tape(narrow)
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
Pipe
Vinyl tape(wide)
Drain hose
Service Manual 15
Installation
For left rear piping
1. Route the indoor tubing and the drain hose to the
required piping hole position.
1
2
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.
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
Spacer
Installation plate
8cm
Indoor unit tubing
Flare nut
Pipes
2. Tighten the flare nut with a wrench.
Outside diameter
mm
inch
Ø6.35
1/4
Ø9.52
3/8
Ø12.7
1/2
Torque
kg.m
1.8
4.2
5.5
Open-end wrench (fixed)
Flare nut
Wrench
Connection pipe
Indoor unit tubing
3. When extending the drain hose at the indoor unit,
install the drain pipe.
Drain hose
Indoor unit drain hose
Adhesive
16 Room Air Conditioner
Vinyl tape (narrow)
Installation
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.
2. Wrap the area which accommodates the rear piping
housing section with vinyl tape.
Plastic bands Insulation material
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.
Piping for
passage through
piping hole
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).
Connecting
cable
Drain hose
Service Manual 17
Installation
CAUTION: 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.
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
mm
inch
Ø6.35
1/4
Ø9.52
3/8
Ø12.7
1/2
Ø15.88
5/8
Ø19.05
3/4
18 Room Air Conditioner
Torque
kg.m
1.8
4.2
5.5
6.6
6.6
Outdoor unit
Liquid side piping
(Smaller diameter)
Gas side
piping
(Bigger
diameter)
Torque wrench
Installation
Connecting the Cables
1. Remove the cover control from the unit by loosening
the 3 screws.
2. Dismount caps on the conduit panel.
3. Temporarily mount the conduit tubes on the conduit
panel.
4. Properly connect both the power supply and low voltage lines to the corresponding terminals on the terminal block.
5. Ground the unit in accordance with local codes.
6. Be sure to size each wire allowing several inches
longer than the required length for wiring.
7. Use lock nuts to secure the conduit tubes.
Wiring Diagram
Indoor Unit
Terminal
(4P)
Connecting cable(Low voltage) b
1
Outdoor Unit
Terminal
(6P)
1
2
2
3
3
4
4
Power supply a
L1* 5
L2 6
G
To
branch
circuit
Ground
* L1 is neutral for 115V models.
NOTICE
NOTICE
1.
Connector trade size for this unit is 1/2".
Refer to "How to connect wiring to the terminals" for
instructions on connecting depending on the wire type
you are using.
shows field wiring.
2. Separately wire the high and low voltage line.
3. Use heat-proof electrical wiring capable of withstanding temperatures up to 167°F.
4. Use outdoor and waterproof connection cable rated
more than 300V for the connection between indoor
and outdoor unit.
(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.
Outdoor unit
Terminal block
Over 5mm
(2")
Conduit panel
Connecting
cable
Power supply
cord
Cover control
Power Supply
Model
Power
source
14K
1Ø, 115V
AWG(MIN) Fuse or breaker
Capacity
14
18
20A
Service Manual 19
Installation
Connection method of the connecting cable(Example)
1. Dismount 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 clamp cord 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. Mount the taped part of cable on the cap.
8. Finally, mount the holed cap with the
wound cable on 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
Clamp cord
G
Cap(Reuse)
Lock nut
Hole (for low
voltage line)
Cap
(Remove)
Taping
(for sealing)
Power supply line
(1ø, 115V, 208/230V)
Low voltage line
(connecting cable)
Conduit panel
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.
20 Room Air Conditioner
Solid wire
Loop
Insulation
Strand wire
Strip 10mm(3/8")
• For solid core wiring (or F-cable)
1. Cut the wire end with a wire cutter of wire-cutting pliers, then strip the insulation to expose
the solid wire about 25mm(15/16")
2. Using a screwdriver, remove the terminal
screw(s) on the terminal plate.
3. Using pliers, bend the solid wire to from a loop
suitable for the terminal screw.
4. Shape the loop wire properly, place it on the terminal plater and tighten securely with the terminal screw using a screwdriver.
• 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.
Strip 25mm(15/16")
How to connect wiring to the terminals
Round
terminal
Screw with
special washer
Screw with
special washer
Round terminal
Round terminal
Wire
Terminal plate
Wire
Installation
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.
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.
WARNING:
• Be sure to refer to the wiring diagram label
inside the cover control and carry out the
correct field wiring.
Wrong wiring can cause the unit to misoperate to result in a fire hazard.
• Check local electrical codes and any specified wiring instructions or limitations.
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 21
Installation
Checking the Drainage
To check the drainage.
1. Pour a glass of water on the evaporator.
Connecting area
drain hose
2. Ensure the water flows through the drain hose of the
indoor unit without any leakage and goes out the
drain exit.
Leakage
checking
Drain pan
Drain
hose
Leakage
checking
Drain piping
1. The drain hose should point downward for easy drain
flow.
Downward slope
2. Do not make drain piping like the following.
Accumulated
drain water
Air
Do not raise
Water
leakage
22 Room Air Conditioner
Water
leakage
Waving
Tip of drain hose
dipped in water
Water
leakage
Ditch
Less than
50mm gap
Installation
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 tapes.
Seal small openings
around pipings with a
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
In cases where the outdoor unit is
installed below the indoor unit perform the
following.
Pipings
Connecting cable
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.
Trap is required to prevent water
from entering into electrical parts.
In cases where the Outdoor unit is
installed above the Indoor unit perform the
following.
Seal a small opening
around the pipings
with gum type sealer.
1. Tape the piping and connecting cable from down to
up.
Trap
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.
Trap
Service Manual 23
Installation
Air Purging
Air purging
The 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, after evacuating the system, take a leak test for the piping and tubing between the indoor and outdoor
unit.
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.
2. Leak 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 air purging. If it is not available, use a stop
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.
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.
1. 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.
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.
Indoor unit
Outdoor unit
Manifold valve
Pressure
gauge
Lo
Hi
Charge hose
Nitrogen gas
cylinder(in vertical
standing position)
24 Room Air Conditioner
Installation
Soap water method
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 counterclockwise 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 connections by a soft
brush to check for leakage of the connecting points of the
piping.
5. If bubbles come out, the pipes have leakage
Liquid side
Gas side
2-way valve
(Open)
3-way valve
(Close)
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.
Hexagonal wrench
Cap
Indoor unit
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
If tubing length is longer
than 10m (33 ft)
15 min. or more
Outdoor unit
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.
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 to test run.
Manifold valve
Pressure
gauge
Lo
Hi
Open
Close
Vacuum pump
Service Manual 25
Installation
Test Running
1. Check that all tubing and wiring are 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.
NOTICE
• Use 2 AAA(1.5volt) batteries. Do not use rechargeable
batteries.
• Remove the batteries from the remote controller if the
system is not used for a long time.
Settlement of outdoor unit
1. Anchor the outdoor unit with a bolt and nut(ø10mm)
tightly and horizontally on a concrete or rigid mount.
2. 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.
3. If the vibration of the unit is transmitted to the hose,
secure the unit with an anti-vibration rubber.
Bolt
Tubing connection
Evaluation of the performance
Operate the unit for 15~20 minutes, then check the system refrigerant charge:
Intake temperature
1. Measure the pressure of the gas side service valve.
2. Measure the temperature of the intake and discharge
of air.
Discharge air
3. Ensure the difference between the intake temperature and the discharge is more than 8°C
4. For reference; the gas side pressure of optimum condition is as below.(Cooling)
The air conditioner is now ready for use.
ambient
Refrigerant Outside
TEMP.
R-22
35°C (95°F)
The pressure of the gas side
service valve.
4~5kg/cm2G(56.8~71.0 P.S.I.G.)
26 Room Air Conditioner
Discharge
temperature
Installation
NOTICE
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.
PUMP DOWN
This is performed when the unit is relocated or the refrigerant circuit is serviced.
Pump Down means collecting all refrigerant into the outdoor unit without the loss of refrigerant.
CAUTION: Be sure to perform Pump Down procedure in the cooling mode.
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 in the manifold hose using the refrigerant.
3. Close the liquid side service valve(all the way).
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 and then quickly turn off the unit. Now Pump Down procedure is completed, and all refrigerant is collected
into the outdoor unit.
Service Manual 27
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
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.
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.
28 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 polong 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 29
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
30 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 31
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
32 Room Air Conditioner
Operation
- 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.
Cooling Model
Operating mode
Indoor Fan Speed
Setting Temperature
Cooling
High
22°C
Heat pump Model
Room Temp. ≥ 24°C 21°C ≤ Room Temp. < 24°C Room Temp. < 21°C
Cooling
Healthy Dehumidification
Heating
High
High
High
22°C
23°C
24°C
• 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 outdoor 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.
■ Air Cleaner Operation
• When an air cleaner function is selected during Air Conditioner operation
- 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.
Service Manual 33
Operation
Display Function
1. Heating Model
2. Cooling Model
Operation Indicator
Operation Indicator
• Cooling, Soft Dry, Fan, Heating
• Cooling, Soft Dry, Fan
Sleep Timer Indicator
Sleep Timer Indicator
• Sleep Mode
• Sleep Mode
Timer Indicator
Timer Indicator
• Timer Mode
• Timer Mode
Outdoor Unit Operation
Defrost Indicator
• Hot-start, Defrost
Self-diagnosis Function
Error
Code
Error Display LED
(Indoor body operation LED)
(once)
1
3sec
34 Room Air Conditioner
3sec
3sec
Error contents
• Indoor room temperature
thermistor open/short
• Indoor pipe temperature
thermistor open/short.
SVC check point
• Indoor Thermistor
assembly check
Operation
Remote Control Operations
The controls will look like the following.
1. START/STOP BUTTON
Operation starts when this button is pressed and
stops when the button is pressed again.
Controls
Signal transmitter
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
Used to start or stop the speed cooling.(speed cooling
operates super high fan speed in cooling mode.)
5
1
6. CHAOS SWING BUTTON
Used to stop or start louver movement and set the
desired up/down airflow direction.
6
3
7. ON/OFF TIMER BUTTONS
Used to set the time of starting and stopping operation.
4
2
7
11
8
13
10
CANCEL
ON
OFF
SET
AUTO CLEAN
°C/°F
14
9
12
8. TIME SETTING BUTTONS
Used to adjust the time.
16
17
18
15
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.
Flip-up door
(opened)
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.
Operation Mode
13. HORIZONTAL AIRFLOW DIRECTION CONTROL
BUTTON (OPTIONAL)
Used to set the desired horizontal airflow direction.
Cooling Operation
Auto Operation or Auto Changeover
14. RESET BUTTON
Used prior to resetting time.
Healthy Dehumidification Operation
15. 2nd F Button
Used prior to using modes printed in blue at the bottom of buttons.
Heating Operation
• Cooling Model(
), Heat Pump Model(
)
16. AUTO CLEAN (OPTIONAL)
Used to set Auto Clean mode.
17. LED LUMINOSITY (OPTIONAL)
Used to adjust LED luminosity.
18. °C/°F SWITCH BUTTON
Used to switch temperature reading from
Centigrade to Fahrenheit.
Service Manual 35
Disassembly
Disassembly
Indoor Unit
WARNING: 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.
• Hold up Inlet Grille Horizentally.
• To remove the Grille, pull the lower left and right
side of the grille toward you (slightly tilted) and lift it
straight upward.
• To seperate connecter assembly and than to
remove Inlet Grille assembly.
1. Before removing the control box, be sure to
take out the wire screwed at the other end.
36 Room Air Conditioner
Disassembly
2. To remove the Control Box.
• Remove securing screws.
• Pull the control box out from the chassis carefully.
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).
Service Manual 37
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.
• Remove the left end of the cross-flow fan from
the self-aligning bearing.
38 Room Air Conditioner
e1
d
g
a
c
b
7 SEGMENT
e
f
GREEN
LED CHIP COLOR
NOTES
10
d1
D2-d
D1-f
D1-a
e2
d2
D2-e
D1-g
D1-b
2
D1-c
6
d2
D2-f
D2-a
3
D1-d
e2
5
D2-g
D2-b
4
D1-e
Vout
GND
Vcc
RECEIVER
PLASMA
PLASMA
D2-c
5
5
4
3
2
1
10
9
8
7
6
1/2W
C01G
104
50V
SCAN 5
SCAN 4
SCAN 3
SCAN 2
SCAN 1
1/2W
1/2W
1/2W
220
220
470
470
1/2W
470
R06G
R07G
R10G
R09G
R08G
CN-DISP1
13
12
11
10
9
8
7
6
5
4
3
2
1
Vcc
RECEIVER
Vout
GND
2
1
2
1
C01G
104
50V
SCAN 5
SCAN 4
SCAN 3
SCAN 2
SCAN 1
Data 5
Data 4
13
12
11
10
9
8
7
6
5
4
3
13
12
11
10
9
8
7
6
5
4
3
2
2
Data 2
Data 3
1
1
Data 1
5V
CN-DISP1
3
3
220
10V SD
C10D+
SMD 2012
L4 100nH
RECEIVER
12V
+ C09D
220
10V SD
9
7
5V
R11H
R12H
C01F
0.01
50V
WP
SCL
7
6
5
A0 SDA
A1
A2
5V
OJ1H
20K
R01P
2012
OJ2H
C07D
104
50V
12V
R01F
1K
5V
9
6
8
1
2
3
4
5
C06D
330
25V SD
20K
R02P
2012
R01C~R04C
20K
12V
HVB OUT
Vcc 8
EEPROM
4
3
2
1 G
R02F
20K
Q01G~05G
KRC107S
8
IC04D
78L05BP
I
O
7805
C08D
103
50V
20K 2012
R11H~R12H
TACT SW
12V
5V
Q01T~05T
KRA223S
+ C09D
220
10V SD
12V
6
5
4
3
2
1
COMP
L1
ZBF503D
5V
5V
C01Z
0.01
1
12
13
14
15
16
11
4
5
6
7
8
9
10
2
3
3
3
4
4
5
5
1
1
1
2
3 4 5 6
7
8
A
V
s
s
AVref
AVdd
RESET
X2
X1
Vss1
INT0
INT1
+ C03S
470uF
25V
O
7812
IC10
I
RxD
TxD
C02S
104
50V
5V
C02Z
0.01
33
36
35
34
38
37
42
41
40
39
44
43
47
46
45
48
5V
5V
R22H
+ C01S
2200uF
35V
DC 5V
TXD OUT
RXD OUT
R96S
10K
R97S
10K
R95S 10K
2
3
-
+
KA393
4
8
5V
E3 1K
IC9-1
R21H
R26H
R25H
R24H
R23H
E2 1K
C01A
0.01
50V
1
3.6V
5V
2
1
5V
12V
C81S
103
50V
IC9-2
KA393
C01L
681
50V
2
INDOOR
FAN
MOTOR
3
4
2
1
1
R93S 10K
3
5
6
4
-
+
5V
R02H
12.1K
1%
R92S 10K
7
R91S
4.7K
R81S
1K
R05H
10K
R04H
6.2K
1%
IC01A
KIA7036P
5V
9
8
R02L,1K
16
14
13
1
3
4
CN-MOTOR
H/S1
12V
C01E
100/25V
IC01SM
KID65004AF
C91S R90S 1K
103
3
OSC01B
CSTS0800MG03-T2
CRTL8.00MSOT
R02A,20K
+
R03E
220
BZ01E
PKM17EPP-2002
R02E
910
CN-VFD(WH)
Q01C
KTC3198-Y
2SC5343
Q02E
KRA107S
12V
R01E
100
R21H~R26H
12.1K, 1%
R01B
1M
RXD OUT
Q01E
KRC107S
Q03E
KRC107S
OR6H OR5H OR4H OR3H OR2H OR1H
F2
F1
Hi
Med
Low O/L
17 18 1920 21 22 23 24 25 26 27 28 29 30 31. 32
BZ
Vdd0
A
V
d
d
1
NEC
UPD780023AGC-C
Vss0
12V
CN-L/R(BL)
IC02M
KID65004AF
16 15 14 13 12 11 10 9
2
2
BL PK YL OR RD
SUB 2P
64 63 62 61 60 59 58 57 56 55 54 53 52 51 50 49
C04S
104
50V
KID65004AF
IC01G
STEPPING MOTOR
(LEFT/RIGHT)
BZ FREQ
9
8
7
6
1
DISPLAY
4
4
CN-U/D(WH)
5
5
KID65004AF
7
TXD OUT
IC01M
H/S1
STEPPING MOTOR
(UP/DOWN)
C92S
104,50V
R99S
750
1/4W
CN-DC/DC
4
7
7
4
3
2
1
1
2
3
4
10
9
8
1
2
4
3
2
1
1
2
3
4
10
9
8
1
2
3
6
6
5
3
5
4
2
1
3
2
1
3
CN-TH1(WH)
CN-HVB(BL)
C07S
100uF
+ 63V POLY SW
RXE250
~
HVB OUT
12V
R01L
5.1K
5V
CN-SUB
RECEIVER
TACT SW
12V
SUB 2P
ROOM-TH
PIPE-TH
HVB
11 11
9
3
2
1
5
6
3
2
1
5
6
7
8
9
7
8
10 10
12V
2
1
1
4
3
2
1
1
2
4
3
2
1
2
1
2
2
3
3
3
4
3
5
4
5
1
3
2
1
3
5
4
5
4
BL
RD
OR
YL
PK
BL
RD
OR
YL
PK
2
2
2
CN-12V
1
1
CN-CONT
SW PWB ASM
1
STEPPING MOTOR
SUCTION 2
STEPPING MOTOR
SUCTION 1
Schematic Diagram
Schematic Diagram
Electric Control Device
1. Indoor Unit
Service Manual 39
40 Room Air Conditioner
1
2
3
4
1
2
3
4
CN-DC/DC
3
2
8
C92
104
50V
D92
1N4148
R92
2.7K
DC 5V
DC 5V
DC 5V
VR71
220
R75
23.2K
34K
1.06K
5.23K
56
R95
7
20K
14
3K
1
3
4
2
R74
2K
1%
4
29.4K
102 +
8
-
D91
1N4148
ZD81
5.1V
R81
XXX
1%
-
3
+
+ C73
100uF
25V
5.1K
C05
470uF
20V
1
8
9
13K
5
+
R73
13K
1%
22
390
R93
C91
103
21.5K
C06
103
O
5V
R64
10K
-
+
I
C67
473K
100V
C03
470uF
25V
7805
IC3
5
L63
L64
R72
11K
1%
+
C04
103
O
12V
Q62
2SD2220
DC 5V
OR5
XXX
1%
R25
12.1K
1%
7812
IC2
C60
103K
100V
C02
104
50V
I
R67
1.5K
C68 C69
102J,100V
C65
821K,1KV
L61
L62
+ C71
100Uf
25V
DC12V
Q71
KRA102M
D62
FMX12S
OR4
XXX
1%
R24
12.1K
1%
R71
10.2K
1%
+ C66
680uF
63V
6
7
OR7
XXX
1%
R27
12.1K
1%
4.3K
LED91
4
13
R68
100K
C72
102J
100V
2
6.04K
-
+
1
10
11
39.2K
51.1K
35.7K
180
IC10
TLP521-1BL
R94
R90
1K
IC9
TLP521-1BL
IC7
HCP6068
2
1
3
4
R91
1K
R82
6.8K
1%
OR8
XXX
1%
R28
12.1K
1%
4
3
2
8
11
4
+
9
7
4
R63
68K
3W
16
15
14
C62
222K
1KV
1
2
3
4
5
6
8
BD01
S1VB60
ZD61
12V
R66
200
D61 ERB44-08
R65
Q61
30,1W
2SK2671
C63
101K
1KV
C01
2200uF
35V
17V
ST2
2
RY-COMP
RY-HEATER
ST1
12
11
9
IC01M
KID65004AP
TH1
DC 5V
DC 5V
R97 1K 13
RY-FAN
LED92
R96 620
RY-4WAY
OR6
XXX
1%
R26
12.1K
1%
R62
560K
1/2W
R32H
1K
R31H
12.1K
4
3
3
3
9
1
POWER TRANS
5
6
7
5
6
4
+ C61
100uF
450V
MICOM
SRDYIN/SRDYOUT/RC3
TMR20V/RB7
EC1/RB6
PWM1/COMP1/RB5
PWM0/COMP0/RB4
INT1/RB3
INTO/RB2
BUZ/RB2
AN0/Aref/RB0
Vdd
AN7/RA7
AN6/RA6
AN5/RA5
AN4/RA4
RA3/AN3
RC4/SCK
RC5/SIN
RC6/SOUT
RD2
Xin
Xout
RESET
Vss
RD0/INT2
RD1/INT3
RA0/EC0
RA1/AN1
RA2/AN2
1
1
NTC1
CN-TRANS
INR14D471K
ZNR1
DKS-80-13
FUSE
250V/3.15A
BD61
U4SBA60
15
16
17
18
19
20
21
22
23
24
25
26
27
28
COIL1
150-F06M
RY-HEATER
RY-FAN
1
3
4
1
1
3
RY-COMP
G4A-1A
CN-FAN
C01A
103
R01A
1K
C11H
103
R11H
10K
1
3
1
3
4
1
3
R01B 1M
3
CN-4WAY
CN-POWER
N/FILTER1
WXE-334K
RY-FAN,4WAY,HEATER
G5N-1A
RY-4WAY,G5N-1A
COIL2
LS404060
GMS81C1408SK(HYUNDDAI:8K)
14
13
12
11
10
9
8
7
6
5
4
3
2
1
3
1
2
7036P
OSC01B
CST-4.00MTW
C02A
10uF
50V
AC230V/60Hz
+
R03A
100
R02A
10K
TEST
KEY
R12H
10K
IC4
DC 5V
DC 5V
Schematic Diagram
2. Outdoor Unit
Schematic Diagram
Wiring Diagram
Indoor Unit
Outdoor Unit
Service Manual 41
Schematic Diagram
Components Location
MAIN P.W.B ASSEMBLY (Indoor)
• PWB ASSY SVC PART LIST
OPTIONAL FUNCTION
NO
1
MODEL
14K Cooling Model
OJ1H, OJ2H: OPEN
42 Room Air Conditioner
P/No.
6871A20535A
OR1H
OR2H
OR3H
OR4H
OR5H
OR6H
12K
5.1K
200K
OPEN
OPEN
OPEN
MAIN P.W.B ASSEMBLY (Outdoor)
• PWB ASSY SVC PART LIST
OPTIONAL FUNCTION
NO
MODEL
P/No.
OR4H OR5H OR6H OR7H OR 8H FUSE
1
14K Cooling Model 6871A10036N
10K
32K
20K
20K
13K
125V
3.15A
RYRYCNHEATER 4WAY RY-FAN 4WAY
X
X
X
X
CNFAN
CN-TH
X
X
Service Manual 43
Schematic Diagram
DISPLAY ASSEMBLY
– 6871A20462
TOP VIEW
BOTTOM VIEW
SUB P.W.B ASSEMBLY
K
44 Room Air Conditioner
Schematic Diagram
• VOLTAGE OF CONNECTORS ACCORDING TO INDOOR FAN SPEED
Input Power
INDOOR
FAN
MOTOR
POWER
TRANS
INDOOR PWB ASSY
BK BK
BL
CN-DC/DC
1
2
1 2 3 4 5 6
CN-POWER
1 2 3 4
BL BK BR RD
BR
RD
3
Outdoor
Connecting Terminal
MODELS
BL
BK
4
Connecting wires
between Indoor
and Outdoor
Indoor
Connecting Terminal
CN-TRANS
1
2
3
4
RY-COMP
14K
No. of pins
DC Voltage(±10%)
CONNELTORS
INDOOR
CNMOTOR
INDOOR
CNDC/DC
OUTDOO
R CNDC/DC
+
-
S-Hi
Hi
Med
Low
Off
1
3
34.1
30.4
24.1
20.0
0.0
2
3
5.0
5.0
5.0
5.0
5.0
4
3
0~5
0~5
0~5
0~5
5.0
1
2
0~12
0~12
0~12
0~12
0~12
3
2
17.0
17.0
17.0
17.0
17.0
4
2
34.1
30.4
24.1
20.0
0.0
1
2
0~12
0~12
0~12
0~12
0~12
3
2
17.0
17.0
17.0
17.0
17.0
4
2
34.1
30.4
24.1
20.0
0.0
Service Manual 45
Troubleshooting Guide
Troubleshooting Guide
Refrigeration Cycle Diagram
(1) Cooling Only Models
INDOOR UNIT
OUTDOOR UNIT
LIQUID SIDE
CAPILLARY TUBE
HEAT
EXCHANGE
(CONDENSER)
HEAT
EXCHANGE
(EVAPORATOR)
GAS SIDE
COMPRESSOR
(2) Cooling & Heating Models
INDOOR UNIT
OUTDOOR UNIT
LIQUID SIDE
CHECK VALVE
(Heating Model only)
3-WAY VALVE
CAPILLARY TUBE
HEAT
EXCHANGE
(EVAPORATOR)
HEAT
EXCHANGE
(CONDENSER)
GAS SIDE
3-WAY VALVE
REVERSING
VALVE
(Heating Model Only)
ACCUMU
LATOR
COMPRESSOR
46 Room Air Conditioner
COOLING
HEATING
Troubleshooting Guide
2-way, 3-way Valve
2-way Valve (Liquid Side)
Hexagonal wrench (4mm)
Flare nut
3-way Valve (Gas Side)
Valve cap
Open position
Flare nut
Closed position
Open position
Closed position
To
piping
connection
To
piping
connection
To outdoor unit
Works
Shipping
1.
Air purging
(Installation)
Operation
Pin
Service Service
port cap port
To outdoor unit
Shaft position
Shaft position
Service port
Closed
(with valve cap)
Closed
(with valve cap)
Closed
(with cap)
Open
(counter-clockwise)
Closed
(clockwise)
Open
(push-pin or with
vacumm pump)
Open
(with valve cap)
Open
(with valve cap)
Closed
(with cap)
Closed
(clockwise)
Open
Open
(counter-clockwise) (connected manifold
gauge)
2.
Pumping down
(Transfering)
Open
Open
3.
Evacuation
(Servicing)
Open
(with charging
cylinder)
Open
Open
4.
Gas charging
(Servicing)
Open
(with charging
cylinder)
5.
Pressure check
(Servicing)
Open
Open
Open
(with charging cylinder)
6.
Gas releasing
(Servicing)
Open
Open
Open
(with charging cylinder)
Service Manual 47
Troubleshooting Guide
Pumping Down
Liquid side
Indoor unit
2-Way
valve
Open
Outdoor unit
Gas side
Closed
3-Way
valve
Lo
CLOSE
CLOSE
Purge the air
• 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
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.
(4) Air purging of the charge hose.
– Open the low-pressure valve on the charge set
slightly to air purge from the charge hose.
(5) Set the 2-way valve to the closed position.
48 Room Air Conditioner
(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 indicating 3 to 5kg/cm2g.
(8) Disconnect the charge set, and mount the 2way 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.
Troubleshooting Guide
Balance Refrigerant of the 3-way Valve
(Gas leakage)
Liquid side
Indoor unit
Outdoor unit
3-Way
valve
Open
Gas side
3-Way
valve
Open
Lo
OPEN
CLOSE
• 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
kg/cm2G. if this is the case, it will not be necessary to apply a evacuatin.
– Discharge the refrigerant gradually; if it is discharged too suddenly, the refrigeration oil will
also be discharged.
Service Manual 49
Troubleshooting Guide
Evacuation
(All amount of refrigerant leaked)
Liquid side
Indoor unit
Outdoor unit
3-Way
valve
Open
Gas side
3-Way
valve
Open
Vacuum pump
Lo
OPEN
CLOSE
• 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.
50 Room Air Conditioner
Troubleshooting Guide
Gas Charging
(After Evacuation)
Liquid side
Indoor unit
3-Way
valve
Open
Outdoor unit
Gas side
Open
3-Way
valve
Check valve
Charging
cylinder
Lo
(1)
OPEN
CLOSE
• Procedure
\
(1) Connect the charge hose to the charging
cylinder.
– Connect the charge hose which you dis-connected 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 valve (Lo side on the charge set 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).
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 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.
– Be sure to check for gas leakage.
Service Manual 51
Troubleshooting Guide
Cycle Parts
Trouble analysis
1. Check temperature difference between intake and discharge air and operating current.
Temp. Difference
Operating Current
Temp. difference : approx. 0°C
Current
: less than 80% of
rated current
• All amount of refrigerant leaked
out. Check refrigeration cycle.
Temp. difference : approx. 8°C
Current
: less than 80% of
rated current
• Refrigerant leakege
Clog of refrigeration cycle
Defective compressor
Temp. difference : less than 8°C
Current
: over the reated
current
• Excessive amount of refrigerant
Temp. difference : over 8°C
• Normal
NOTICE
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.
Suction pressure
(Compared with
the normal value)
Temperature
(Compared with
the normal valve)
Cause of Trouble
High
Defective compressor
Defective 4-way reverse valve
Current is low.
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
Normal
Lower
Higher
Description
Current is low.
NOTICE
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.
52 Room Air Conditioner
Troubleshooting Guide
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?
YES
NO
Primarily, the operating condition of Micom is OK.
Check the voltage of power(About AC 115V, 60Hz)
• Main power's voltage
• Voltage applied to the unit
• Connecting method of Indoor/Outdoor connecting
cable
• Check PWB Ass'y(Outdoor unit)
- Fuse
- Pattern damage
- Varistor(ZNRI)
Check each load(Indoor/Outdoor Fan Motor,
Compressor, Stepping Motor) and contacting
condition of related connector(including connecting
cable of Indoor/Outdoor Unit)
Check the connection housing for contacting
• Connector related to CN-POWER
• Connector related to CN-FAN
• Connector contacting of Outdoor Fan/Compressor
• Display PWB Ass'y Check
• Connector related to CN-DC/DC
PCB Board Operation Check
Content
Items
• Power Transformer
(Outdoor unit)
- Input Voltage
- Output Voltage
Remedy
- About AC115V±10% - Check the power voltage
- About AC17±3V
• Replace Trans
• IC2 (Outdoor),
IC1Ø (Indoor) Output
• DC +12V
• Replace IC2, IC1Ø
• IC3 (Outdoor),
ICØ4D (Indoor) Output
• DC +5V
• Replace IC3, ICØ4D
• IC4 (Outdoor),
IC01A (Indoor),
OSCØ1B (8MHz/4MHz)
• Voltage of Outdoor unit Micom No. 8,
Voltage of Indoor unit Micom No. 36 and soldering
condition
• Replace faulty parts
Service Manual 53
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 controller
When the mark(
battery.
) is displayed in LCD screen, replace
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 the connecting circuit between the remote controller
MICOM (No. ) - R17(2Ω) - IR LED - Q1 - R16(2.2KΩ).
Caused by other parts except the remote controller
Check the contact of CN-DISP1 connector.
Check DISP PWB Ass'y
- Voltage between CN DISP1 ⑪ - ⑬ : DC +5V
Check point
• Check the connecting circuit between PIN②RØ2L(1K) - CØ1L(680PF) - MICOM PIN
• Check Receiver Ass'y
54 Room Air Conditioner
Troubleshooting Guide
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 2°F at least.
When in Fan 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).
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 R02(12.1K), R04(6.2K), Micom (No.27)
(Indoor unit).
• Check the indoor temperature sensor is disconnected or not(About 10kΩ / at 25°C).
When the temperature around Outdoor PWB Ass'y is above 163°F the
compressor is stop and only Outdoor Fan is operating.
Check Relay(RY - COMP) for driving compressor.
• When the power(About AC200V) is applied to the connecting wire terminal support transferred to compressor, PWB Ass'y is normal.
• Check the circuit related to the relay(Outdoor unit).
Check point
Between Micom(No.
15) and GND
Between IC8(No. 16)
and GND IC0M(No.16)
COMP ON
COMP OFF
DC5V
DC0V
Below DC 1V
(app)
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.
Service Manual 55
Troubleshooting Guide
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 51?
Does the voltage of terminal of CN-DC/DC CONNECTOR in
Indoor unit corresponds to the values in the table of page 51?
Do the voltage of terminal of
CN-DC/DC CONNECTOR in
Outdoor unit corresponds to the
values in the table of page 51?
NO
Check the patterns and the
conditions of outdoor unit
PWB Assy's.
YE
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
※ 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)
56 Room Air Conditioner
Troubleshooting Guide
When Left/Right Louvers do not operate.
• Confirm that the Left/Right Vertical Louver is normally geared with the
shaft of Stepping Motor.
• If the regular torque is detected when rotating the Left/Right Vertical
Louver with hands ⇒ Normal
• Check the connecting condition of CN-U/D, CN-L/R Connector
• Check the soldering condition(on PWB) of CN-U/D, CN-L/R Connector
Check the operating circuit of the Vertical Louver
• Confirm that there is DC +12V between pin① of CN-U/D, CN-L/R and
GND.
• Confirm that there is a soldering short at following terminals.
- Between 10 , 11 , 12 and 13 of ICØ1M
- Between 13 , 14 , 15 and 18 of ICØ2M
- Between 54 ~ 60 and 61 of MICOM
- Between 1 , 2 , 3 , 4 and 5 of CN-U/D, CN-L/R
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 57
Troubleshooting Guide
When Inlet Grille does not operate.
• Confirm that the Inlet Grille is normally geared with the shaft of Stepping
Motor.
• If the regular torque is detected when moving the Inlet Grille with hands
⇒ Normal
• Check the connecting condition of CN-SUB Connector
• Check the soldering condition(on PWB) of CN-SUB Connector
Check the operating circuit of the Vertical Louver
• Confirm that there is DC +12V between pin② of CN-SUB and GND.
• Confirm that there is a soldering short at following terminals.
- Between 45 , 40 , 48 and 53 of MICOM
- Between 1 , 2 , 3 and 4 of CN-SUB
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
58 Room Air Conditioner
Troubleshooting Guide
When a comunication error occurs.
• The operation indicator of Indoor unit blinks five times.
• The red indicator of Outdoor unit blinks five times.
Check the connecting wires between Indoor and Outdoor unit for the
connecting error and the contacting condition.
Check the installation condition of outdoor unit.
Check for the communication error and the operating condition of product
after also operating with the remote controller, then taking above 2 minutes.
Apply the power again after about 10 seconds by the power of Outdoor unit
is off.
Check for the communication error and the operating condition of product
after also operating with the remote controller, then taking above 2 minutes.
Check the PWB assembly of Indoor and Outdoor unit.
Caution: If the connecting wires of Indoor and Outdoor unit are not connected within 2 minutes after the power
of Outdoor unit is applied, a communication error will occur. Therefore, the power should be applied
after connecting them.
Service Manual 59
Troubleshooting Guide
The phenomena in case of connecting error
INDOOR UNIT
Connector Type
CN-DC/DC
Condition
Open and connecting error
Phenomena
• The same as the phenomenon of Outdoor Unit.
① ② ③ ④
①
②
③
④
Blue
Black
Brown
Red
CN-MOTOR
Open
• The indoor fan does not operate.
• The operation indicator of Indoor unit blinks 8 times.
Open
• The up/down vane does not operate.
CN-U/D
Short between terminals
Open
CN-DISP1
• The up/down vane does not smoothly operate.
• It does not operate with a remote controller.
• The operation indicator blinks once.
On for 0.5 second
Open
Off for 3 seconds
• The compressor and the outdoor fan stop.
• The indoor fan speed is low.
CN-TH
Short between terminals
(③ and ④) of ROOM-TH.
CN-L/R
• The operation indicator blinks once
(on for 0.5 second, off for 3 seconds).
• The compressor operates continuously regardless
of the setting temperature and the variation of room
temperature.
Short between terminals
(① and ②) of PIPE-TH.
• The operation indicator blinks once
(on for 0.5 second, off for 3 seconds)
• Continuous operation
Open
• The Left/Right vane does not operate.
Short between terminals
60 Room Air Conditioner
• The Left/Right vane does not smoothly operate.
Troubleshooting Guide
Outdoor Unit
Connector Type
Condition
OPEN
CN-POWER
Connecting reversely
Phenomena
• All functions stop.
• The operation with the remote controller, forced and
test one do not operate.
• PWB pattern is damaged when applying the power.
OPEN
• All functions stop or the compressor does not operate.
• The operation with the remote controller, forced and test
one do not operate.
Connecting reversely
• All functions stop.
• The operation with the remote controller, forced and test
one do not operate.
CN-TRANS
OPEN
• All functions stop.
• The operation with the remote controller, forced and
test one do not operate.
CN-FAN
OPEN
• The Indoor Fan does not operate.
OPEN
• All functions stop.
• The operation with the remote controller, forced and test
one do not operate.
Connecting error
(① ↔ ②)
• The only signal of remote controller operation/stop is
inputted, but the product does not operate.
• The RED indicator of outdoor unit blinks 5 times after 2
minutes with applying the power.
Connecting error
(① ↔ ③)
• The beep sound, such as "beep, beep, beep, beep,
beep", occurs periodically in Indoor unit.
• The signal input of a remote controller and operation of
product is impossible.
• The RED indicator blinks 5 times after 2 minutes with
applying the power.
Connecting error
(① ↔ ④)
• The signal of remote controller is inputted, but the
product does not operate.
• The RED indicator of outdoor unit and the operation
indicator of indoor one blinks 5 times after 2 minutes
with applying the power.
Connecting error
(② ↔ ③)
• No power for Indoor unit.
• The signal input of the remote controller and operation of product is impossible.
• The thermal protector of the Power Trans operates
when let it alone for long time.
Connecting error
(② ↔ ④)
• The signal of the remote controller is inputted.
• The fuse and Q61 in the Outdoor unit are damaged
when the indoor fan is operated.
Connecting error
(③ ↔ ④)
• No power for Indoor unit.
• The signal input of the remote controller and operation of product is impossible.
• The RED indicator of the Outdoor unit blinks 5 times
after 2 minutes with applying the power.
RY-COMP
terminal
The connecting
wire of CNDC/DC, and
Indoor and
Outdoor Unit
④ ③ ② ①
①
②
③
④
Blue
Black
Brown
Red
Service Manual 61
Exploded View & Replacement Parts List
Exploded View & Replacement Parts List
Indoor Unit
135312
146811
152302
668713
146811
145200
668713
135314
268712
135080
733010
267110
359011
342800
354212
131410
352150
346810
249951
35211B
146811
159901
135311
135516
268714
62 Room Air Conditioner
Exploded View & Replacement Parts List
Parts List(Indoor)
LOCATION
No.
131410
135080
135080
135311
135314
135312
145200
146811
146811
152302
159901
249951
268712
263230
267110
268714
342800
346810
35211B
352150
354212
354212
359011
668713
668713
73310
W0CZZ
135516
DESCRIPTION
CHASSIS ASSEMBLY
DECORATION (TOP)
DECORATION (BOTTOM)
GRILLE ASSEMBLY, DISCHARGE
GRILLE ASSEMBLY, INLET
MIRROR
BLUE
WHITE
METAL
CHERRY
GRILLE ASSEMBLY, FRONT
MIRROR
BLUE
WHITE
METAL
CHERRY
LINK
MOTOR ASSEMBLY, STEP
MOTOR ASSEMBLY, STEP
FILTER (MECH), A/C
VANE HORIZONTAL
CONTROL BOX ASSEMBLY
DISPLAY LED ASSEMBLY
THERMISTOR ASSEMBLY
REMOTE CONTROLLER ASSEMBLY
PWB(PCB) ASSEMBLY, MAIN
BEARING
MOTOR ASSEMBLY, INDOOR
TUBE ASSEMBLY, TUBING
HOSE ASSEMBLY, DRAIN
EVAPORATOR ASSEMBLY, FIRST
EVAPORATOR ASSEMBLY, FINAL
FAN ASSEMBLY, CROSS FLOW
PWB ASSEMBLY, SUB
PWB ASSEMBLY, SUB
PLATE
CAPACITOR,DRAWING
COVER ASSEMBLY,MOTOR
PART No.
LA140CE/LA141CE
3141A20007B
3508A20034F
3508A20034E
3531A10137E
3531A20118E
3531A21010E
3531A20138W
3531A20138Y
3531A20138Z
3531A10147H
3531A20238E
3531A10158P
3531A10158R
3531A10158S
4520A20008A
4681A20055A
4681A20055B
5230A20022A
5990A20015B
4995A10138A
6327A90023D
6323A20004H
6711A20083Q
6871A20535A
4280A20004A
4681A
5211A21419B
5251AR1222R
5421A20086D
5421A20105P
5901A20016J
6871A20258C
6871A20259A
1H00843A
3551A20050C
REMARKS
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Service Manual 63
Exploded View & Replacement Parts List
Outdoor unit
437210
435301
437212
554031
435511
546810
552102-2
559010
649950
552201
552111
268714
552102-1
552116
W0CZZ
552202
567502
561410
668711
554160
447910
550140
552203-1
430410
552203-2
64 Room Air Conditioner
Exploded View & Replacement Parts List
Parts List(Outdoor)
LOCATION
No.
430410
435511
437210
437212
447910
546810
550140
552102-1
552102-2
552111
552116
552201
552202
552203-1
552203-2
554031
554160
559010
W0CZZ
435301
561410
567502
649950
668711
268714
DESCRIPTION
BASE ASSEMBLY, OUTDOOR
COVER ASSEMBLY, CONTROL
PANEL ASSEMBLY, FRONT
PANEL ASSEMBLY REAR
BARRIER ASSEMBLY, OUTDOOR
MOTOR ASSEMBLY, OUTDOOR
ISOLATOR, COMP.
TUBE, CAPILLARY BEND
TUBE, CAPILLARY BEND
TUBE ASSEMBLY, CAPILLARY
TUBE ASSEMBLY, REVERSING
VALVE, CHECK
VALVE, REVERSING
VALVE, SERVICE
VALVE, SERVICE
CONDENSER ASSEMBLY, BENT
COMPRESSOR
FAN ASSEMBLY, PROPELLER
CAPACITOR, DRAWING
GRILLE, DISCHARGE
COIL ASSEMBLY, REVERSING VALVE
O.L.P
CONTROL BOX ASSEMBLY, OUTDOOR
PCB ASSEMBLY, MAIN
PCB ASSEMBLY, MAIN
PART No.
LA140CE/LA141CE
3041A20008J
3551AR7184R
3721A20027P
3721A20026K
4791A30002F
4681A20004R
4H00982E
5210A30041U
5211A21143H
5220A20005B
5220A20003B
5403A20019B
2520UKJC2AA
5901A10004A
0CZZA20001L
3530A20006G
6750U-L046A
4995A10038G
6871A10036Q
6871A20522A
REMARKS
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
R
Service Manual 65
P/No.: 3828A20195N
March, 2007
Printed in Korea
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