Ceiling Cassette Type
Single-Zone
Air Conditioning
DMC24CA-1
DMC36CA-1
Before servicing the unit, read the
“safety precautions” in this manual.
Only for authorized service personnel.
Safety Presautions
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
Do not use a defective or under-
rated circuit breaker. Use this
appliance on a dedicated circuit.
Always ground the product.
Install the panel and the cover
of control box securely.
• There is risk of fire or electric
shock.
• There is risk of fire or electric
shock.
• There is risk of fire or electric
shock.
Always install a dedicated cir-
cuit and breaker.
Use the correctly rated break-
er or fuse.
Do not modify or extend the
power cable.
• Improper wiring or installation may • There is risk of fire or electric
cause fire or electric shock shock.
• There is risk of fire or electric
shock.
Service Manual 3
Safety Presautions
Do not install, remove, or re-
install the unit by yourself
(customer).
Be cautious when unpacking
and installing the product.
For installation, always con-
tact the dealer or an
Authorized Service Center.
• There is risk of fire, electric shock, • Sharp edges could cause injury.
• There is risk of fire, electric shock,
explosion, or injury.
explosion, or injury.
Be especially careful of the case
edges and the fins on the con-
denser and evaporator.
Do not install the product on a Be sure the installation area
Do not let the air conditioner
run for a long time when the
humidity is very high and a
door or a window is left open.
defective installation stand.
does not deteriorate with age.
• It may cause injury, accident, or
damage to the product.
• If the base collapses, the air condi- • Moisture may condense and wet or
tioner could fall with it, causing
property damage, product failure,
and personal injury.
damage furniture.
■ Operational
Do not touch(operate) the
product with wet hands.
Do not place a heater or other
appliances near the power
cable.
Do not let electric parts of the
product get wet.
• There is risk of fire or electrical
shock.
• There is risk of fire or electric
shock.
• There is risk of fire, failure of the
product, or electric shock.
4 Ceiling Cassette Air Conditioner
Safety Presautions
Do not store or use flammable gas or com-
bustibles near the product.
If strange sounds, or small or smoke comes
from product. Turn the breaker off or discon-
nect the power supply cable.
• There is risk of fire or failure of product.
• There is risk of electric shock or fire.
G a s o l i n
Do not open the inlet grill of the product during Be cautious that water could not enter the
operation. (Do not touch the electrostatic filter,
if the unit is so equipped.)
product.
• There is risk of physical injury, electric shock, or prod- • There is risk of fire, electric shock, or product damage.
uct failure.
■ Installation
Always check for gas (refrigerant) leakage after Install the drain hose to ensure that water is
installation or repair of product.
drained away properly.
• Low refrigerant levels may cause failure of product.
• A bad connection may cause water leakage.
Service Manual 5
Safety Presautions
Keep level even when installing the product.
Use two or more people to lift and transport
the product.
• To avoid vibration or water leakage.
• Avoid personal injury.
90˚
■ Operational
Use a soft cloth to clean. Do not use harsh
detergents, solvents, etc.
Do not touch the metal parts of the product
when removing the air filter. They are very
sharp!
• There is risk of fire, electric shock, or damage to the
plastic parts of the product.
• There is risk of personal injury.
Do not step on or put anyting on the product.
(outdoor units)
Do not insert hands or other objects through
the air inlet or outlet while the product is oper-
ated.
• There is risk of personal injury and failure of product.
• There are sharp and moving parts that could cause
personal injury.
6 Ceiling Cassette Air Conditioner
Features & Benefits
Features & Benefits
Environment Friendly Refrigerant :
- LG Ceiling Cassette Air Conditioners uses environ-
ment friendly refrigerant, which don't do any harm to
the environment.
Dust
electrode
discharge
Dust particles
Pre-filter
Ionizer
Dusts Collection
+
+6.5KV
discharge
+
Purified
fresh Air
Polluted
Air
+
Plasma Air Purifier :
+
+
- It removes not only microscopic contaminants &
dust, but also house mites, pollen, and pet fur to help
preventing allergic diseases like asthma.It provides
odor free, dust free and allergy free air.
Generating
plasma
dusts
Odour
aluminum coated
electrode(-)
(3.25KV discharge)
Odor molecule
1
2
........
16
Group Control :
- It enables to control as much as 16 units with the
help of one wired remote controller. All the units will
follow same setting of temperature & other sub func-
tions.
........
Central Control :
M
1
M
2
M
16
M
17
M
18
M
128
- It enables to control 16 x 8 = 128 units with the help
of 8 controllers. All units can be put on and off from
one Central Room. For Setting Temperature, Fan
Speed and other sub functions, access the respec-
tive LCD wired remote controller of each unit.
Main
PCB
Sub Sub
1
Sub
16
Sub Sub
17 18
Sub
128
2
Controller
# 1
Controller
# 2
Controller
# 8
Jet Cool :
-In this mode, quick and fast cooling is done. Cold and
high velocity air is supplied to the room till the indoor
temperature reaches 18°C(64°F). The unit will contin-
ue to run in jet cool mode till the Indoor temperature
reaches 18°C(64°F).
Service Manual 7
Features & Benefits
Swirl Swing
4- Open(Conventional)
Swirl Swing(New)
Comparison of Floor
Temp. Distribution(20°C)
- It is the function for comfort cooling/heating operation.
- The diagonal two louvers are opened the
more larger than the other louvers.
After one minute, it is opposite.
2.4%
100% Improved
4.8%
Comparison of Air Flow Types
4- Open(Conventional)
Swirl Swing(New)
Vane 2
Vane 1 Open
Vane 1 Close
Open
Open
Close
Open
Close
Close
Open Close
Close Open Close
Open Close
Open
Open
Vane 2
Vane 2
Vane 3 Close
Vane 3
Vane 3 Open
Vane 1
Open
Open
Vane 4
Open Close
Open
Vane 4
Time
Time
Vane 4
Space Control
Vanes angle can be controlled by pair, considering its
installation environment.
- For example direct drafts can be annoying, leading
to discomfort and reduced productivity vane control
helps to eliminate this problem.
- Easily controlled by wired remote control.
- Air Flow can be controlled easily regarding any
space environment.
Auto Restart Operation :
- Whenever there is electricity failure to the unit, and after resumption of the power, unit will start in the same
mode prior to the power failure. Memorized condition are on / off condition, operating mode, set temperature
and fan speed.The unit will memorize the above conditions and start with same memorized condition.
Two Thermistor Control :
- There may be a significant difference between the temperature taken at the installed product and indoor tem-
perature. Two thermistor control provides option to control temperature by referring any of the two tempera-
tures. With the help of the slide switch at the back of the LCD wired remote controller, selection of the desired
thermistor for controlling the unit can be done. One thermistor is in the Indoor unit & the other one is in the
LCD wired remote.
8 Ceiling Cassette Air Conditioner
Features & Benefits
High Ceiling Operation
- According to the height of ceiling installation, it pro-
vides variability of indoor fan motor rpm. If the height
of installation is low then you can adjust low rpm of
indoor fan motor. On the other hand if the height of
the installation is high you can adjust high rpm of
indoor fan motor. Selection of speed can be done by
slide switch at the back of the LCD wired remote.
ex:
Selection
Lower
Standard
Higher
Height
RPM
2.4m(7.9ft)
2.7m(8.9ft)
3.0m(9.8ft)
700/600/500
750/650/550
800/700/600
Water Drain Pump :
- In some of the places natural drainage is not possi-
ble. For such places drain pump is very useful. It
removes condensed water from the unit.
Time Delay Safety Function :
- It delays restarting of the compressor by three min-
utes thereby preventing damage to the compressor.
5~6W
Zero Standby Power:
- Due to SMPS (Switching Modulation Power Supply)
technology, there is almost zero power consumption
in the standby mode.
0.5W
LG
Others
Child Lock Function:
-It prevents the children or others from tampering the
control buttons. Unit can be controlled by the wireless
remote controller. This can be easily set by pressing
timer key & Min key simultaneously. After child lock is
set, pressing any key will displaye CL on the LCD for
3 seconds and all the keys will be ineffective.
Self Diagnosis Function:
CHILD LOCK
-Display
- This function provides diagnosis of the unit. An
error code will be displayed on the LCD wired
remote controller & diagnosis can be done as per
the code indication. The same is also printed on
key cover of the LCD wired remote controller.
Service Manual 9
List of Functions
List of Functions
• Ceiling Cassette
DMC24CA-1
DMC36CA-1
Category
Function
Air supply outlet
4
4
Airflow direction control (left & right)
Airflow direction control (up & down)
Auto swing (left & right)
Auto swing (up & down)
Airflow steps(Fan / Cool / Heat)
CHAOS swing
X
Auto
X
O
3/4/-
X
X
Auto
X
O
3/4/-
X
Air flow
CHAOS wind (Auto wind)
Jet cool (Power wind)
Swirl wind
X
O
O
X
O
O
Deodorizing filter
X
X
Air purifying
Installation
Reliability
Plasma air purifier
O
O
O
-
-
O
X
O
O
O
O
-
-
O
X
O
Prefilter(Washable)
Drain pump
E.S.P. control
Electric heater (Operation)
High ceiling operation
Hot start
Self diagnosis
Soft dry operation
O
O
Auto changeover
X
X
Auto cleaning
X
X
Auto operation(Artificial intelligence)
Auto restart operation
Child lock
O
O
O
O
O
O
O
O
Convenience
Forced operation
Group control
Option
Option
Sleep mode
-
-
Timer (On/Off)
O
O
Timer (weekly)
O
O
Two thermistor control
Standard wired remote controller
Deluxe wired remote controller
Simple wired remote controller
Wired remote controller(for hotel use)
Wireless remote controller(simple)
Wireless LCD remote controller
General central control(Non LGAP)
Dry contact
O
O
-
-
O
O
-
-
Individual Control
-
-
-
PQWRHSF0
Option
Option
Option
Option
Option
X
-
PQWRHSF0
Option
Option
Option
Option
Option
X
CAC Network
Function
Simple central control(LGAP)
PDI(Power Distribution Indicator)
PI 485
CTIE
Special Function Kit
Others
Zone control
X
-
X
-
Thermistor
Note :
O : Applied, X : Not applied, – : No relation
Option: Model name & price are different according to options, and assembled in factory with main unit.
Accessory: Installed at field, ordered and purchased separately by the corresponding model name, supplied with separate package.
10 Ceiling Cassette Air Conditioner
Function of Remote Control
Function of Remote Control
1. Wireless LCD Remote Control
1. START/STOP BUTTON
Operation starts when this button is pressed and
stops when the button is pressed again.
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 and high.
5. JET COOL
Used to start or stop the speed cooling.(speed cooling
operates super high fan speed in cooling mode.)
6. AUTO SWING BUTTON
5
6
Used to stop or start louver movement and set the
desired up/down airflow direction.
1
3
7. ON/OFF TIMER BUTTONS
Used to set the time of starting and stopping opera-
tion.
4
8. TIME SETTING BUTTONS
Used to adjust the time.
10
2
7
CANCEL
9. TIMER SET/CANCEL BUTTON
Used to set the timer when the desired time is
obtained and to cancel the Timer operation.
9
12
17
SET
ON
OFF
AUTO CLEAN
11
8
10. SLEEP MODE AUTO BUTTON
°C/°F
Used to set Sleep Mode Auto operation.
18
14
16
13
11. AIR CIRCULATION BUTTON
15
Used to circulate the room air without cooling.
12. ROOM TEMPERATURE CHECKING BUTTON
Used to check the room temperature.
13. PLASMA AIR CLEAN BUTTON
Used to start or stop the plasma-purification func-
tion.
Flip-up door
(opened)
14. HORIZONTAL AIRFLOW DIRECTION CONTROL
BUTTON (OPTIONAL)
Used to set the desired horizontal airflow direction.
Operation Mode
15. RESET BUTTON
Used prior to resetting time.
Cooling Operation
16. 2nd F Button
Used prior to using modes printed in blue at the bot-
tom of buttons.
Auto Operation
17. AUTO CLEAN (OPTIONAL)
Used to set Auto Clean mode.
18. °C/°F SWITCH BUTTON
Healthy Dehumidification Operation
Used to switch temperature reading from Centigrade
to Fahrenheit.
■ The wireless remote controller do not operate the swirl mode.
Service Manual 11
Function of Remote Control
2. Wired LCD Remote Control
AUTO SWING OPERATION
SET TEMP
Room Temp
FAN SPEED SUB FUNCTION
HI
AUTO Heater Preheat
1
MED
LO
JET
Defrost Humidify
SLo Filter
Out door
ZONE
2ndF
Time
1
2
3
4
Operation unit No Func Program set
Timer
On Off
Set no. Time 01 03 05 07 09 11 13 15 17 19 21 23
3
17
2
5
10
11
12
13
14
15
Timer
Cancel
2ndF
6
4
Program Week Holiday
Set/Clr
Plasma
7
8
9
Hour
Min
RESET
16
18
1 Operation display
9 Plasma Air Clean Button
Displays the operation conditions.
Used to start or stop the plasma-purification function.
2 On/Off Button
10 Timer Cancel Button
Operation starts when this button is pressed, and
stops when the button is pressed again.
Used to cancel the timer.
11 Timer Set Button
3 Set Temperature Button
Used to set the timer when the desired time is
obtained.
Used to set the temperature when the desired tem-
perature is obtained.
12 Week Button
4 FAN Operation Button
Used to set a day of the week.
Used to circulate room air without cooling.
13 Program Button
5 Fan Speed & Jet Cool Button
Used to set the weekly timer.
Used to set the desired fan speed and select jet
cool mode.
14 Holiday Button
Used to set a holiday of the week.
6 Operation Mode Selection Button
15 Time Set Button
Used to select the operation mode.
• Auto Operation Mode
Used to set the time of the day and change the
time in the weekly timer Function.
• Cooling Operation Mode
• Soft Dry Operation Mode
16 Set and Clear Button
7 Auto Swing Button
Used to set and clear the weekly timer.
Used to swing up and down.
17 Swirl Button
8 Room Temperature Checking Button
Used to select swirl swing mode.
Used to check the room temperature.
18 Reset Button
Used to set the current time and clear the setting
time.
12 Ceiling Cassette Air Conditioner
Specifications
Specifications
Indoor unit type
Ceilling Cassette - 4way
DMC24CA-1 DMC36CA-1
Model
Power supply
Phase/Volts/Hz
1 / 208-230 / 60
1 / 208-230 / 60
Cooling capacity
kW
Btu/h
kW
7.03
9.96
24,000
34,000
Heating capacity
-
-
Btu/h
A
-
-
Current
Fan
Nominal running current
Motor Type
1.0
1.0
BLDC
BLDC
Fan Type
Turbo Fan
Turbo Fan
Motor Output(W) * number of units
50.6 * 1
50.6 * 1
Air flow rate (H/M/L)
cmm
18.4/17.0/15.6
24.1/22.7/21.2
cfm
650/600/550
850/800/750
Capacitor
mF/V
-
-
Drive
DC
DC
2R * 9C * 18
840 * 840 * 225(331/16 * 331/16 * 87/8)
950 * 950 * 30(3713/32 * 3713/32 * 13/16)
26(57.3)
Coil
Row * stages * FPI
Body
mm
2R * 9C * 18
Dimensions
(W*D*H)
Net Weight
mm(inch)
mm(inch)
kg(lbs)
840 * 840 * 225(331/16 * 331/16 * 87/8)
Decorative Panel
Body
950 * 950 * 30(3713/32 * 3713/32 * 13/16)
26(57.3)
3(6.61)
Decorative Panel
Body
kg(lbs)
3(6.61)
Gross Weight
kg(lbs)
30(66)
30(66)
Decorative Panel
kg(lbs)
4(9)
4(9)
Air filter
Long Life filter
38/35/32
6.35(1/4)
12.7(1/2)
32/25(1.26/0.98)
3.0(6.3)
Long Life filter
40/37/34
Sound Level (H/M/L)
dB(A)+3
mm(inch)
mm(inch)
mm(inch)
l/h(pts/h)
Piping Connections Liquid
Gas
6.35(1/4)
15.88(5/8)
Drain
OD/ID
32/25(1.26/0.98)
3.7(7.8)
Dehumidification rate
Safety Devices
Temperature sensor
Refrigerant
Fuse, Thermal protector for Fan motor
Thermistor
R410A
Thermistor
R410A
Refrigerant control
EEV
EEV
Connectable outdoor Unit
Single
Single
Power and Transmission interunit cable
No.* mm2 (No. AWG)
4 * 2.1(14)
4 * 2.1(14)
Note :
Conversion Formula
1. Capacities are based on the following conditions:
Cooling: - Indoor Temperature 26.7°C(80°F) DB /19.4°C(67°F) WB
- Outdoor Temperature 35°C(95°F) DB /23.9°C(75°F) WB
Piping Length - Interconnecting Piping Length 7.5m(25ft)
- Level Difference of Zero.
kW
= Btu/h × 0.0002931
CFM = CMM × 35.3
Service Manual 13
Specifications
Outdoor Unit
DMC24CA-1
DMC36CA-1
7.03
24,000
9.96
34,000
Rated Capacity
Rated Input
Cooling
kW
Btu/h
kW
Btu/h
kW
-
-
-
-
Heating
2.5
-
3.6
-
Cooling
Heating
kW
-
-
Energy Label
-
-
17
-
Testing combination
Running current
11.5
-
Cooling
Heating
A
A
24
38
Starting current
Power supply
Power supply Cable(outdoor)
Power and transmission cable
Dimensions
Net weight
Gross weight
(Cooling/Heating)
A
1 / 208-230 / 60
3 * 2.1(14)
2 / 208-230 / 60
3 * 3.3(12)
Phase / Volts / Hz
No. * mm2(No. AWG)
No. * mm2(No. AWG)
mm(inch)
kg(lbs)
4 * 2.1(14)
4 * 2.1(14)
870 * 800 * 320(341/2 * 311/2 * 1219/32)
900 * 1160 * 370(357/16 * 4511/16 * 149/16)
W * H * D
73(160)
78(172)
1
86(190)
93(205)
kg(lbs)
1
Maximum number of connectable unit
ROTARY
2*GK120KAA
Induction
700
ROTARY
GJ151KAA + GJ208KAA
Induction
1200
Compressor
(constant)
Type
Qty * model
Motor Type
Oil charge volume
Oil type
cc
PVE
PVE
2100(74.1)
R410A
2500(88.2)
R410A
Refrigerant
Charge(at 7.5m(25ft))
Type
g(oz)
EEV
EEV
Control
2R * 36C * 20
-
2R * 52C * 18
-
Heat Exchanger
Fan
Rows * Column * FPI
Defrosting method
Capacitor
6 / 370
6 / 370
mF/Vac
Direct Drive
Side discharge
51(1801)
55
Direct Drive
Side discharge
105(3708)
58
6.35(1/4)
15.88(5/8)
35(115)
Drive
Discharge Direction
Air flow rate
Side / Top
cmm(cfm)
db (A) + 3
mm(inch)
mm(inch)
m(ft)
Noise level(H)
Sound press, 1m
6.35(1/4)
12.7(1/2)
30(100)
15(50)
Piping connections Liquid
Gas
Max. piping length Main piping
20(66)
Max. elevation
Indoor unit - Outdoor unit
m(ft)
Note :
Conversion Formula
1. Capacities are based on the following conditions:
Cooling: - Indoor Temperature 26.7°C(80°F) DB /19.4°C(66.9°F) WB
- Outdoor Temperature 35°C(95°F) DB /23.9°C(75°F) WB
Piping Length - Interconnecting Piping Length 7.5m(25ft)
- Level Difference of Zero.
kW
= Btu/h × 0.0002931
CFM = CMM × 35.3
14 Ceiling Cassette Air Conditioner
Dimensional Drawings
Dimensional Drawings
1. Indoor Units
Model No.: DMC24CA-1 / DMC36CA-1
900(35.4) (ceiling opening)
840(33.1)
688(27.1) (hanging bolt)
225(8.9)
950(37.4)
950(37.4)
950(37.4)
840(33.1)
688(27.1)
1
3
2
6
840(33.1)
4
5
7
* mm(inch)
No.
1
Part Name
Decoration panel
Remark
2
Air suction grille
3
4
5
Air discharge grille
Gas pipe connection
Liquid pipe connection
6
7
Drain pipe connection
Power supply connection
Service Manual 15
Dimensional Drawings
2. Outdoor Units
Model No.: DMC24CA-1
870(34.3)
546(21.5)
160(6.3)
54.6(2.1)
333(13.1)
320(12.6)
*mm(inch)
16 Ceiling Cassette Air Conditioner
Dimensional Drawings
Model No.: DMC36CA-1
900(35.4)
550(21.7)
175(6.9)
370(14.6)
4
1
65(2.6)
3
2
5
308(12.1)
*mm(inch)
No.
1
Part Name
Remark
Air discharge grille
2
Gas pipe connection
Liquid pipe connection
3
4
5
Power & transmission connection
Earth screw
Service Manual 17
Wiring Diagrams
Wiring Diagrams
1. Indoor Unit
DMC24CA-1 / DMC36CA-1
Connector Number
CN-POWER
CN-MOTOR
CN-DPUMP
CN-DISP
Location
AC power supply
BLDC fan motor output
Drain pump output
Display
CN-FLOAT
CN-REMO
CN-CC
Float switch input
Remote control
Dry-contact
CN-ROOM
CN-PIPE1
CN-PIPE2
Room sensor
In-pipe thermistor
Out-pipe thermistor
Elevation grille
CN-GRILL
CN-HVB
HVB Ass'y (Air cleaner)
18 Ceiling Cassette Air Conditioner
Wiring Diagrams
2. Outdoor Unit
DMC24CA-1
Notes:
BL
RD
YL
BLUE
BK
BLACK
BR
BROWN
WHITE
RED
OR
ORANGE
WH
YELLOW
GN/YL GREEN/YELLOW
FIELD WIRING
DMC36CA-1
Notes:
BL
RD
YL
BLUE
BK
BLACK
BR
BROWN
RED
OR
ORANGE
WH
WHITE
YELLOW
GN/YL GREEN/YELLOW
FIELD WIRING
Service Manual 19
Refrigerant Cycle Diagrams
Refrigerant Cycle Diagrams
1. Cooling Only Models
INDOOR UNIT
OUTDOOR UNIT
High
pressure
S/W
Thermistor
Thermistor
Gas Side
H/EX
Check
Valve
Check
Valve
Thermistor
(Air)
Capillary Tube
Accumulator
Heat
Exchanger
GAS SIDE
Thermistor
E.E.V.
LIQUID SIDE
Pipe Size(Diameter:Ø) inch
Piping length (ft.)
Elevation (ft.)
Additional
Capacity
Refrigerant
(oz/ft)
Gas
Liquid
Rated
Max.
Rated
Max.
0.22
0.32
24k
34k
1/4
1/4
1/2
5/8
100
115
16
16
50
66
25
20 Ceiling Cassette Air Conditioner
Installation
Installation
1. Select the best location
Install the air conditioner in the location that satisfies the following conditions.
1.1 Indoor Unit
• There should not be any heat source or steam near the
unit.
• There should not be any obstacle to the air circulation.
• A place where air circulation in the room will be good.
• A place where drainage can be easily obtained.
Ceiling
Ceiling Board
Ceiling Board
• A place where noise prevention is taken into considera-
tion.
• Do not install the unit near the door way.
• Ensure the spaces indicated by arrows from the wall,
50(19.7)
or more
50(19.7)
or more
ceiling, or other obstacles.
• The indoor unit must have sufficeient maintenance
space.
Unit:cm(inch)
Floor
1.2 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 is more than 30cm(11.8inch) and sides is more than 30cm(11.8inch).
The front of the unit should have more than 70cm(27.6inch) 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.
• Rooftop Installations : If the outdoor unit is installed on a roof structure, be sure to level the unit. Ensure the
roof structure and anchoring method are adequate for the unit location. Consult local codes regarding rooftop
mounting.
Sunr
More than
30cm(11.8inch)
Sunr
oof
More than
50cm(19.7inch)
oof
More than 50cm(19.7inch)
(Service space)
More than
50cm(19.7inch)
More than
30cm(11.8inch)
Fence or
Fence or
obstacles
obstacles
More than 50cm(19.7inch)
More than 50cm(19.7inch)
More than 70cm(27.6inch)
More than
100cm(39.4inch)
Service Manual 21
Installation
2. Settlement of outdoor unit
• Anchor the outdoor unit with a bolt and
nut(ø10mm(0.39inch)) tightly and horizontally on a
concrete or rigid mount.
Tubing connection
Bolt
• When installing on the wall, roof or rooftop, anchor
the mounting base securely with a nail or wire assum-
ing the influence of wind and earthquake.
• In the case when the vibration of the unit is conveyed
to the hose, secure the unit with an anti-vibration rub-
ber.
3. Indoor Unit Installation
Ceiling
Keep the length of the bolt
Hanging bolt
from the bracket to 40mm(1.57inch)
(W3/8 or M10)
Nut
Flat washer for M10
Air Conditioner body
(W3/8 or M10)
(accessory)
Ceiling board
Ceiling board
Spring washer
(M10)
Flat washer for M10
(accessory)
Nut
Set screw of
paper model (4 pieces)
Paper model
for installation
(W3/8 or M10)
Open the ceiling board
along the outer edge of the
paper model
Adjust the same height
• Drill the piping hole on the wall slightly tilted to
the outdoor side using a Ø 70(2.76inch) hole-core
drill.
• The following parts is option.
Hanging Bolt - W 3/8 or M10
Nut - W 3/8 or M10
Spring Washer - M10
Plate Washer - M10
Wall
Indoor
Outdoor
CAUTION
• Tighten the nut and bolt to prevent unit falling.
22 Ceiling Cassette Air Conditioner
Installation
4. Wiring Connection
1. All wiring must comply with local and national electrical codes.
2. Select a power source that is capable of supplying the current as required by the air conditioner.
3. Feed the power source to the unit via a distribution switch board designed for this purpose.
4. The terminal screws inside the control box may be loose due to vibration during transport.
Check the screws for loose connection.
(Running the air conditioner with loose connection can overload and damage electrical components.)
5. Always ground the air conditioner with a grounding wire and connector to meet the local and national codes.
24k/34k Btu/h (1Ø)
• Cooling & Heating type
Terminals on the indoor unit
1(L)2(N)
1(L)2(N)
3
4
4
5
5
Terminals on the outdoor unit
1(L) 2(N)
3
POWER
INPUT
CAUTION!
Power wire sizing and overcurrent selection must be made based on minimum circuit ampacity
and maxiumum fuse size indicated on the outdoor unit rating plate. Interconnecting wiring
between the indoor and outdoor unit must comply with local and national electrical codes.
WARNING
Make sure that the screws of the terminal are free from looseness.
Service Manual 23
Installation
5. Installation of Decoration Panel
Before installing the decoration panel,
always remove the paper template.
The decoration panel has its installation
direction.
1. Temporarily fix two decoration panel fixing screws (hexagon M5 screw) on the unit body. (Tighten by
amount 10mm(0.39inch) in length.)
The fixing screws (hexagon M5 screw) are included the indoor unit box.
2. Remove the air inlet grille from the decoration panel. (Remove the hook for the air inlet grille cord.)
3. Hook the decoration panel key hole (
that the screws reach the key hole edge.
) on the screws fixed in step above, and slide the panel so
4. Retighten completely two temporarily fixed screws and other two screws. (Total 4 screws)
5. Connect the louver motor connector and display connector.
6. After tightening these screws, install the air inlet grille (including the air filter).
Air conditioner unit
Piping side
Decoration panel fixing screws
(hexagon M5 screws)
Control box cover
Temporally fitting at 2 places
(Tightening about 10mm(0.39inch))
Louver motor
Inlet Grille
Decoration panel
Display
Key holes
Lead wire for
louver motor and
display
Decoration panel fixing screws
(Hexagon M5 screw)
Inlet Grille
CAUTION
Install certainly the decoration
panel.
Cool air leakage causes sweating.
Water drops fall.
Good example
Bad example
Air conditioner unit
Air conditioner
unit
Air
Cool air leakage
(no good)
Ceiling
board
Ceiling
board
Decoration
panel
Decoration panel
Fit the insulator (this part) and
be careful for cool air leakage
24 Ceiling Cassette Air Conditioner
Installation
6. Heat Insulation and pipings
HEAT INSULATION
1. Use the heat insulation material for the refrigerant piping which has an excellent heat-resistance (over
120°C(248°F) ).
Fastening band
(accessory)
2. Precautions in high humidity circumstance:
This air conditioner has been tested according to
the "KS Standard Conditions with Mist" and con
here is not any default. However, if it is operated for
Refrigerant piping
a long time in high humid atmosphere (dew point
temperature: more than 23°C(73.4°F)), water drops
are liable to fall. In this case, add heat insulation
material according to the following procedure:
Indoor unit
Thermal insulator
(accessory)
• Heat insulation material to be prepared... Adiabatic glass wool with thickness 10 to 20mm(0.39 to 0.79inch).
• Stick glass wool on all air conditioners that are located in ceiling atmosphere.
• In addition to the normal heat insulation (thickness: more than 8mm(0.31inch)) for refrigerant piping (gas
piping: thick piping) and drain piping, add further 10mm to 30mm(0.39inch to 1.18 inch) thickness material.
FORM THE PIPINGS
1. Wrap the connecting portion of indoor unit with
Seal a small opening
the Insulation material and secure it with two
around the pipings
Plastic Bands. (for the right pipings)
• If you want to connect an additional drain hose,
the end of the drain-outlet should be kept at a
distance from the ground. (Do not dip it into
water, and fix it on the wall to avoid swinging in
the wind.)
with gum type sealer.
Drain hose
Taping
In case of the Outdoor unit being installed
below position of the Indoor unit.
Pipings
Connecting
cable
Plastic Band
Power supply
cord
2. Tape the Piping, drain hose and Connecting
Cable from bottom to top.
3. Form the piping gathered by taping along the
exterior wall and attach it to the wall by saddle or
equivalent.
Trap is required to prevent water from entering
into electrical parts.
Service Manual 25
Installation
Seal a small opening
around the pipings
with gum type sealer.
In case of the Outdoor Unit being installed
above position of the Indoor Unit.
Trap
2. Tape the Piping and Connecting cable from bot-
tom to top.
3. Form the pipings gathered by taping along the
exterior wall, and make the trap prevent water
from entering into the room.
4. Attach the piping onto the wall by saddle or equiva-
lent.
7. Drain Pipe Work
■ Drain Piping of Ceiling Cassette
Upward
routing
not allowed
• Drain piping must have down-slope (1/50 to 1/100): be sure not to
provide up-and-down slope to prevent reversal flow.
• During drain piping connection, be careful not to exert extra force
on the drain port on the indoor unit.
Pipe clamp
Indoor unit
• The outside diameter of the drain connection on the indoor unit is
32mm(1.26inch).
Maintenance
drain port
Piping material: Polyvinyl chloride pipe VP-25
and pipe fittings
•
Be sure to install heat insulation on the drain piping.
300mm
(11.81inch) or less
1 -1.5m(3.32-4.92ft)
Heat insulation material: Polyethylene foam with
thickness more than 8 mm(0.31inch).
■■Install the drain raising pipes at a right angle to the
indoor unit and no more than 300mm(11.81inch) from
the unit.
Drain raising pipe
Drain hose(attached)
Clamp metal(attached)
Drain test
• Connect the main drain pipe to the exterior and
leave it provisionally until the test comes to an end.
• Feed water to the flexible drain hose and check the
piping for leakage.
• Be sure to check the drain pump for normal operat-
ing and noise when electrical wiring is complete.
• When the test is complete, connect the flexible
drain hose to the drain port on the indoor unit.
The air conditioner uses a drain pump to drain water.
Use the following procedure to test the drain pump
operation:
Flexible drain hose
Feed water
(accessory)
Main
drain pipe
Drain
port
Glue the joint
Drain Pump
Drain hose connection
Use the clip (accessory)
Flexible drain hose
1/50~1/100
Drain pan
CAUTION
The supplied flexible drain hose should not be curved,
neither screwed. The curved or screwed hose may
cause a leakage of water.
MAX 700mm
(27.6inch)
26 Ceiling Cassette Air Conditioner
Installation
8. Test running
1) PRECAUTIONS IN TEST RUN
• The initial power supply must provide at least 90% of the rated voltage.
Otherwise, the air conditioner should not be operated.
CAUTION
For test run, carry out the cooling operation first even during winter season.
Carry out the test run more than 5 minutes without stopping.
(Test run will be cancelled 18 minutes later automatically)
• The test run is started by pressing the room temperature checking button and down timer button for 3 sec-
onds at the same time.
• To cancel the test run, press any button.
CHECK THE FOLLOWING ITEMS WHEN INSTALLATION IS COMPLETE
• After completing work, be sure to measure and record trial run properties, and store measured data, etc.
• Measuring items are room temperature, outside temperature, suction temperature, blow out temperature,
wind velocity, wind volume, voltage, current, presence of abnormal vibration and noise, operating pressure,
piping temperature, compressive pressure.
• As to the structure and appearance, check following items.
■ Is the circulation of air adequate?
■ Is the draining smooth?
■ Is the remote controller switch operated?
■ Is there any faulty wiring?
■ Is the heat insulation complete
(refrigerant and drain piping)?
■ Is there any leakage of refrigerant?
■ Are not terminal screws loosened?
M4......118N.cm{12kgf.cm}{10.4lbf.in}
M5......196N.cm{20kgf.cm}{17.4lbf.in}
M6......245N.cm{25kgf.cm}{21.7lbf.in}
M8......588N.cm{60kgf.cm}{52.1lbf.in}
Service Manual 27
Installation
2) Connection of power supply
1. Connect the power supply cord to the independent
power supply.
• Circuit breaker is required.
2. Operate the unit for fifteen minutes or more.
3) Evaluation of the performance
1. Measure the temperature of the intake and dis-
charge air.
2. Ensure the difference between the intake tempera-
ture and the discharge one is more than
8°C(14.4°F).
Thermometer
CAUTION
After the confirmation of the above conditions, prepare the wiring as follows:
1) Always use a dedicated circuit for the air conditioner. As for the method of
wiring, see the circuit diagram pasted on the inside of control box cover.
2) Provide a circuit breaker switch between power source and the unit.
3) The screws which fasten the wiring in the casing of electrical fittings are liable to come loose from
vibrations during transportation. Check them and make sure they are all tight.
(If they are loose, it could give rise to burn-out of the wires.)
4) Specification of power source
5) Confirm that electrical capacity is sufficient.
6) Be sure that the starting voltage is maintained at more than 90 percent of the rated voltage marked
on the name plate.
7) Confirm that the cable size is selected using the minimum circuit ampacity on label.
(Particularly note the relation between cable length and wire gauge.)
8) Use GFCI breaker where it is wet or moist and/or required by local and national codes.
9) The following troubles would be caused by excess voltage drop.
• Vibration of a magnetic switch, damage on the contact point there of, fuse blowing, disturbance to the nor-
mal function of a overload protection device.
• Proper starting power is not given to the compressor.
HAND OVER
Teach the customer the operation and maintenance procedures, using the operation manual (air filter cleaning,
temperature control, etc.).
28 Ceiling Cassette Air Conditioner
Installation
9. Optional Operation
1) Two Thermistor System
(1) Open the rear cover of the wired remote-controller to set the mode.
(2) Select one of three selectable modes as follows.
• Position 1: The room themperature is controlled by the thermistor of the wired remote-controller, control the
temperature according to the position of wired remote-controller.
• Position 2: The room temperature is controlled by the thermistor of the main body.
• Position 3: The room temperature is controlled by lower temperature between the temperature of main body
and of remote-controller sensor.
(3) Move the slide switch to set position.
Slide switch for 2 Thermistor
1
2
3
1
2
3
1
2
3
(4) Close the rear cover and check if it works normally.
CAUTION
• Select the position after counselling with a customer.
• In case of cooling mode, room temperature is controlled by the main body sensor.
• To control the room temperature by a wired remote controller, install controller(room temp. sensor) to sense
the temperature more accurately.
• Maunfactured in the position 3.
Service Manual 29
Installation
2) Adjusting air volume to the height of ceiling
You can choose the RPM(or air volume) of indoor motor according to the height of ceiling to supply the com-
fortable atmosphere to consumers.
Procedure
1. Choose the selectable position in the table after measuring the height of ceiling.
Ceiling height
Mode of slide switch
High Ceiling
Standard
Change of air volume
Remark
more than 3.3m(10.8ft)
2.7~3.3m(8.9~10.8ft)
less than 2.7m(8.9ft)
Increasing
-
Maunfactured in stan-
dard mode
Low Ceiling
Decreasing
2. In the case of changing the height as "high" or "low", open the rear cover of the wired remote-controller.
3. Move the slide switch to the set position.
1
2
3
4. Close the rear cover and check if it works nomally.
1
2
3
1
2
3
Slide switch for
ceiling height
3) Group Control
It operates maximum 16 Units by only one Wired Remote Controller, and each Unit starts sequentially to prevent
overcurrent.
Wiring design
Main PCB
Indoor Unit 1
Indoor Unit 2
Indoor Unit 16
Terminal(Local Supply)
Terminal(Local Supply)
Terminal(Local Supply)
Block
Block
Block
Connector
Connector
Connector
RED(12V)
RED(12V)
Main PCB
#1
Main PCB
#2
Main PCB
#16
YL(SIGNAL)
BR(GND)
YL(SIGNAL)
BR(GND)
YL(SIGNAL)
BR(GND)
YL(SIGNAL)
BR(GND)
YL(SIGNAL)
BR(GND)
YL(SIGNAL)
BR(GND)
....
Connecting Cable(Local Supply)
....
I
I
tt
ot f
r
o
rtnt
re
i
Wired Remote Controller
Single Control
Group Control 1
Group Control 2
• Using the supplied Wired Remote Controller, wire
them like above.
S/W GR
Remote
Controller
PCB
• Move S/W GR to "Group Control 1" position.
• Check the line color of the wire.
CAUTION
• Be careful not to exchange the color of wires.
• The maximum length of connecting wire should be below 200m(656ft)(25Ω) on connecting each units.
• Use a wire more than 0.5mm2
30 Ceiling Cassette Air Conditioner
Troubleshooting Guide
Troubleshooting Guide
Cycle Troubleshooting Guide
Trouble analysis
1. Check temperature difference between intake and discharge air, and operating current.
Temp. difference : approx. 0°C(0°F)
All amount of refrigerant leaked out.
Check refrigeration cycle.
Current
: less than 80% of
rated current
Temp. Difference
Operating Current
Refrigerant leakage
Clog of refrigeration cycle
Defective compressor
Temp. difference
Current
:
approx. 8°C(14.4°F)
: less than 80% of
rated current
Temp. difference
Current
:
less than 8°C(14.4°F)
Excessive amount of refrigerant
: near the rated cur-
rent
Temp. difference : over 8°C(14.4°F)
Normal
Notice:
Temperature difference between intake and discharge air depends on room air humidity. When the room air
humidity is relatively higher, temperature difference is smaller. When the room air humidity is relatively lower
temperature difference is larger.
2. Check temperature and pressure of refrigeration cycle.
Suction pressure
(Compared with
the normal value)
Temperature
(Compared with
the normal value)
Cause of Trouble
Description
High
Defective compressor
Current is low.
Higher
Normal
Excessive amount of
refrigerant
High pressure does not quickly
rise at the beginning of operation.
Insufficient amount of
refrigerant(Leakage)
Clogging
Current is low.
Lower
Higher
Notice:
2
1. The suction pressure is usually 4.5~6.0 kg/cm G (65-85 psig) at normal conditions.
2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with
putty.
Service Manual 31
Troubleshooting Guide
Electronic Parts Troubleshooting Guide
The Product doesn’t operate at all.
Trouble 1
Turn off the main power and wait until LED on outdoor PCB is off
Turn on the main power again.
Does the Operating LED of indoor unit blink
Refer to the self-diagnosis function.
Check the connecting state of connector
Check the diagram wiring on the control panel
Check the main power.
When Operation's ON?
Is the Connection between CN-POWER of indoor
unit and terminal block?
Is the Connection of cable between indoor and
Outdoor unit right?
Is the voltage of CN-POWER in outdoor
PCB ASS'Y about AC220/240V?
Check the Fuse of outdoor PCB Ass'y.
Check the connecting state of wires
Check the Auto Addressing Work
Replace the PCB Ass'y
Confirm Auto Addresssing work method
* The product's operation starts at three minutes after main power turning on
32 Ceiling Cassette Air Conditioner
Troubleshooting Guide
Product doesn't operate with the remote controller.
Trouble 2
Turn on main power.
While the compressor has been stopped, the compressor does not operate
owing to the delaying function for 3 minutes after stopped.
When the compressor stopped Indoor Fan is driven by a low speed.
At this point the wind speed is not controlled by the remote controller.
(When operated in the Sleeping Mode, the wind speed is set to the low speed as force.)
Caused by other parts except
Caused by the remote controller.
the remote controller
When the mark (
) is displayed in LCD
Check the contact of CN-DISP 1 connector
screen, replace battery.
When the detect switch (double key) inside the
remote controller door is fault, it is impossible to
operate temperature regulating(■ / ■) and wind
speed selecting.
Check DISP PWB Ass'y
-Voltage between CN1 ■■- ■■: DC +5V
Check the Display PWB Ass'y
• Check receiver ass'y
Service Manual 33
Troubleshooting Guide
When cooling does not operate
Trouble 3
Turn on Main Power
Operate "Cooling Mode( )" by setting the desired temperature of the
remote controller to at least 1°C(1.8ºF) below room temperature.
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).
When the sensor circuit for indoor temperature and connector are in bad
connection or are not engaged, Compressor/Outdoor Fan is stopped.
• Check the indoor temperature sensor is disconnected or not(About 10kΩ / at
25°C(77°F)).
Check Relay(RY - COMP) for driving compressor.
• When the power(About AC208V-230V) is applied to the connecting wire
terminal support transferred to compressor, PWB Ass'y is normal.
• Check the circuit related to the relay.
Check point
COMP ON
COMP OFF
Between two pin of DC
part in relay for COMP
Below DC 1V
(app)
About DC12V
34 Ceiling Cassette Air Conditioner
Troubleshooting Guide
When indoor Fan does not operate
Trouble 4
Turn off Main power
Check the connection of CN-FAN or CN-MOTOR
Check the Fan Motor
Check the Fuse(AC250V/T2A)
Check the related circuit of indoor Fan Motor.
• The pin of Micom, and the part for driving SSR
• Check the pattern
• Check the SSR
- SSR Open: Indoor Fan Motor never operate
- SSR short: Indoor Fan Motor always operates in case of ON or OFF.
Turn ON Main Power
Check the SSR high speed operation by remote control.
(The Indoor Fan Motor is connected)
The voltage of PIN NO 1(blue) and 3(yellow) of CN-FAN or CN-MOTOR.
About AC 160V over
SSR is not damaged
About AC 50V over
SSR Check
Service Manual 35
Troubleshooting Guide
When Vertical Louver does not operate
Trouble 5
• Confirm that the Vertical Louver is normally geared with the shaft of
Stepping Motor.
• If the regular torque is detected when rotating the Vertical Louver with
hands
Normal
• Check the connecting condition of CN-U/D Connector
• Check the soldering condition(on PWB) of CN-U/D Connector
Check the operating circuit of the Vertical Louver
+
• Confirm that there is DC 12V between pin (RED) of CN-U/D and
GND.
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
36 Ceiling Cassette Air Conditioner
Troubleshooting Guide
Self-diagnosis Function
■ Error Indicator
• The function is to self-diagnoisis airconditioner and express the troubles identifically if there is any trouble.
• Error mark is ON/OFF for the operation LED of evaporator body in the same manner as the following table.
• If more than two troubles occur simultaneously, primarily the highest trouble fo error code is expressed.
• After error occurrence, if error is released, error LED is also released simultaneously.
• To operate again on the occurrence of error code, be sure to turn off the power and then turn on.
• Having or not of error code is different from Model.
Indoor Error
MPS
Variable
MPS
Inverter
LED 1
(Red)
LED 2
(Green)
Indoor
Status
Error code
Description
00
01
02
03
04
05
06
No Error
ON
Indoor Room Thermistor Error
Indoor In-Piping Error
1 time
2 times
3 times
4 times
5 times
6 times
OFF
OFF
OFF
OFF
OFF
OFF
Remote controller Error
Drain Pump Error
Communication Error between In and Out
Indoor Out-Piping Error
Outdoor Error
MPS
Variable
MPS
Inverter
LED 1
(Red)
LED 2
(Green)
Indoor
Status
Description
Error Code
21
22
23
24
25
26
27
28
32
33
40
41
44
45
46
47
51
53
54
60
61
62
63
65
DC Peak(IPM Fault)
CT2(Max CT)
2 times
2 times
2 times
2 times
2 times
2 times
2 times
2 times
3 times
3 times
4 times
4 times
4 times
4 times
4 times
4 times
5 times
5 times
5 times
6 times
6 times
6 times
6 times
6 times
1 time
2 times
3 times
4 times
5 times
6 times
7 times
8 times
2 times
3 times
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
DC Link Low Volt
High/Low Pressure/Heatsink Switch
Low Voltage / Over Voltage
DC COMP Position Error
PSC Fault Error
DC Link High Volt
D-Pipe High(INV)
D-Pipe High(Normal)
CT Sensor(open/short)
INV. D-Pipe Thermistor Error(Open/Short)
Outdoor Air Thermistor Error(Open/Short)
Cond Pipe Thermistor Error(Open/Short)
Suction Pipe Thermistor Error(Open/Short)
Const. D-Pipe Thermistor Error(Open/Short)
Capcity Error(High/Low)
1 times
4 times
5 times
6 times
7 times
1 times
3 times
4 times
Signal Error(Indoor_Outdoor)
Phase Error
EEPROM Check Sum Error
Cond Pipe High
1 times
2 times
3 times
5 times
Heatsink High
Cond Pipe Low
Heatsink Thermistor Error(Open/Short)
Service Manual 37
Troubleshooting Guide
Troubleshooting CH01, CH02, CH06
Display
code
Title
Cause of error
Check point & Normal condition
• Open / Short
• Soldered poorly
• Internal circuit error
Normal resistor : 10KΩ/ at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
Indoor air sensor
01
• Open / Short
• Soldered poorly
• Internal circuit error
Normal resistor : 5KΩ/ at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
Indoor inlet pipe sensor
Indoor outlet pipe sensor
02
06
• Open / Short
• Soldered poorly
• Internal circuit error
Normal resistor : 5KΩ/ at 25°C(77°F) (Unplugged)
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
10kΩ
2.5Vdc
V
Ω
Check the resistance
Check the voltage
Check Point
1. Unplug the sensor on Indoor unit PCB.
2. Estimate the resistance of each sensor.
3. If the resistance of the sensor is 10KΩ/ 5KΩ at 25°C(77°F), then sensor is normal.
4. If the resistance of the sensor is 0 KΩ or ∞, then sensor is abnormal. ■ Change the sensor.
5. Plug the sensor on Indoor unit PCB and Power ON.
6. Estimate the voltage of each sensor.
7. If the voltage of the sensor is 2.5Vdc at 25°C(77°F), then sensor is normal.
8. If the resistance of the sensor is 0 or 5Vdc, then sensor is abnormal. ■ Repair or Change the PCB.
38 Ceiling Cassette Air Conditioner
Troubleshooting Guide
Troubleshooting CH03
Display
Title
Cause of error
Check point & Normal condition
• Connection of wire
• Main PCB Volt. DC12V
• Noise interference
code
Communication
Wired R/C
• Open / Short
• Wrong connection
03
Wired R/C
Indoor Unit
GND
12V
S
GND
12V
S
12Vdc
12Vdc
V
V
Check the Volt.
Check the Volt.
Check Point
1. Check the wire connection. (Open / Short) ■ Repair the connection
2. Check the soldering state of connector. (Soldered poorly) ■ Repair or Change the PCB.
3. Check the volt. Of main PCB power source. (DC 12V, DC 5V) ■ Repair or Change the main PCB.
4. Check the installation of wired remote controller. (Noise interference) ■ Adjust the state of installation
Service Manual 39
Troubleshooting Guide
Troubleshooting CH04
Display
Title
Cause of error
Check point & Normal condition
code
• The connection of wire(Drain pump/ Float switch)
• Drain pump power input. (220V)
• Drain tube installation.
Drain pump
/ Float switch
• Float switch Open.
(Normal : short)
04
• Indoor unit installation. (Inclination)
CN Float
0Ω
Ω
Check the resistance
Check Point
1. Check the wire connection. (Open, Soldered poorly) ■ Repair the connection or change the PCB.
2. Check the resistance of float switch (Abnormal : Open, Normal : short) ■ Check the float switch.
3. Check the level of water
4. Check the volt. Of Drain pump power supply. (AC 230V) ■ Repair or Change the main PCB.
40 Ceiling Cassette Air Conditioner
Troubleshooting Guide
Troubleshooting CH05, CH53
Display
code
Title
Cause of error
Check point & Normal condition
• Power input AC 220V. (Outdoor, Indoor)
• The connector for transmission is disconnected.
• The connecting wires are misconnected.
• The GND1,2 is not connected at main GND.
• The communication line is shorted at GND.
• Transmission circuit of outdoor PCB is abnormal.
• Transmission circuit of indoor PCB is abnormal.
05
/
Communication
(Indoor ■ Outdoor)
• Communication poorly
53
Check Point
1. Check the input power AC230V. (Outdoor, Indoor unit)
2. Check the communication wires are correctly connected.
■ Adjust the connection of wire
■ Confirm the wire of “Live”, “Neutral”
3. Check the resistance between communication line and GND. (Normal : Over 2MΩ)
4. Check the connector for communication is correctly
connected.
5. Check the connection of GND1, GND2, and main GND.
6. If one indoor unit is operated normally, outdoor PCB is no problem.
■ Check the another indoor unit.
* CH05 is displayed at indoor unit, CH53 is displayed at outdoor unit.
Service Manual 41
Troubleshooting Guide
Troubleshooting CH24, CH25
Display
code
Title
Cause of error
Check point & Normal condition
• Check the connection of “CN_Press”.
• Check the components.
• Low / High press
S/W open.
24
Press S/W Open
• Abnormal Input voltage
• Check the power source.
• Check the components.
Input voltage
25
(140Vac , 300Vac
.
Check Point
• CH 24
• CH 25
1. Check the power source.
1. Check the connection of “CN_PRESS”
2. Check the install condition for over load.
3. Check the SVC V/V open.
2. Check the components
(Trans1, B/Diode, Diode, Resistance)
4. Check the leakage of refrigerant.
42 Ceiling Cassette Air Conditioner
Troubleshooting Guide
Troubleshooting CH32, CH33
Display
code
Title
Cause of error
Check point & Normal condition
• Check the discharge pipe sensor for INV.
• Check the install condition for over load.
• Check the leakage of refrigerant.
• Check the SVC V/V open.
D-pipe (Inverter)
temp. high
• Discharge sensor
(Inverter) temp. high
32
(105°C(221°F)
)
• Check the discharge pipe sensor for Cons.
• Check the install condition for over load.
• Check the leakage of refrigerant.
• Check the SVC V/V open.
D-pipe (Constant)
temp. high
• Discharge sensor
(Cons.) temp. high
33
(105°C(221°F)
)
105°C
105°C
COMP OFF
COMP OFF
(221°F)
(221°F)
90°C
(194°F)
80°C
(176°F)
LEV OPEN
LEV OPEN
LEV OPEN/Hz down
LEV OPEN/Hz down
95°C
(203°F)
90°C
(194°F)
NORMAL
NORMAL
Inverter
Constant
Check Point
• CH 32
• CH 33
1. Check the install condition for over load.
2. Check the SVC V/V open.
1. Check the install condition for over load.
2. Check the SVC V/V open.
3. Check the leakage of refrigerant.
3. Check the leakage of refrigerant.
4. Check the constant compressor. (same with CH21)
Service Manual 43
Troubleshooting Guide
Troubleshooting CH41, CH44, CH45, CH46, CH47, CH65
Display
code
Title
Cause of error
Check point & Normal condition
• Open / Short
• Soldered poorly
• Internal circuit error
• Normal resistor : 200KΩ / at 25°C(77°F) (Unplugged)
• Normal voltage : 4.5Vdc / at 25°C(77°F) (plugged)
41
D-pipe sensor (Inverter)
• Open / Short
• Soldered poorly
• Internal circuit error
• Normal resistor : 10KΩ / at 25°C(77°F) (Unplugged)
• Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
44
45
46
47
65
Air sensor
• Open / Short
• Soldered poorly
• Internal circuit error
• Normal resistor : 5KΩ / at 25°C(77°F) (Unplugged)
• Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
Condenser Pipe sensor
Suction Pipe sensor
D-pipe sensor (Constant)
Heat sink sensor
• Open / Short
• Soldered poorly
• Internal circuit error
• Normal resistor : 5KΩ / at 25°C(77°F) (Unplugged)
• Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
• Open / Short
• Soldered poorly
• Internal circuit error
• Normal resistor : 200KΩ / at 25°C(77°F) (Unplugged)
• Normal voltage : 4.5Vdc / at 25°C(77°F) (plugged)
• Open / Short
• Soldered poorly
• Internal circuit error
• Normal resistor : 10KΩ / at 25°C(77°F) (Unplugged)
• Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)
Check Point
1. Estimate the resistance of each sensor.(Unplugged)
2. Estimate the voltage of each sensor.(Plugged)
3. If the resistance of the sensor is 0 kΩ or ∞, then sensor is abnormal.
If the voltage of the sensor is 0 V or 5Vdc, then sensor is abnormal.
Ω
44 Ceiling Cassette Air Conditioner
Troubleshooting Guide
Troubleshooting CH51, CH60
Display
code
Title
Cause of error
Check point & Normal condition
• Over Capacity
Combination
• Undder Capacity
Combination
• Check the indoor unit capacity.
• Check the combination table.
51
Capacity Error
EEPROM
Check sum
• Check the PCB ASM P/No.
• Check the poor soldering.
• Check sum error
60
Check Point
• CH 51
• CH 60
1. Check the insertion condition of EEPROM.
2. Check the poor soldering
1. Check the indoor unit capacity.
Service Manual 45
Troubleshooting Guide
Troubleshooting CH61, CH62
Display
Title
Cause of error
Check point & Normal condition
code
Condenser
pipe sensor
temp. high
• Condenser pipe sensor
detected high
temp.(65°C)(149°F)
• Check the load condition.
• Check the sensor of Condenser pipe sensor.
61
• Heat sink sensor
detected high
temp.(85°C)(185°F)
Heat sink sensor
temp. high
• Check the fan is locked.
• Check the sensor of heat sink.
62
Heat Sink temp.
Toff °C
T2 °C
T1 °C
COMP Frequency
Normal
Normal
OFF
Normal
(Hz)
Check Point
• CH 61
• CH 62
1. Check the fan is locked.
1. Check the install condition for over load.
(Refrigerant, Pipe length, Blocked, …)
2. Check the Outdoor temp. is very high.
46 Ceiling Cassette Air Conditioner
(3-way) Valve
(3-way) Valve
3-way Valve (Liguid Side)
3-way Valve (Gas Side)
Valve cap
Open position
Valve cap
Open position
Closed position
Closed position
Pin
Pin
To piping
To piping
connection
Service
Service
port
connection
Service
port cap
Service
port
port cap
To outdoor unit
To outdoor unit
Service port
Works
Shaft position
Shaft position
Service port
Shipping
Closed
Closed
Closed
Closed
(with cap)
(with valve cap)
(with valve cap)
(with cap)
Air purging
Open
Closed
Open
Open
(Installation)
(counter-clockwise) (push-pin or with
vacuum pump)
(clockwise)
(push-pin or with
vacuum pump)
1.
2.
Operation
Open
Open
Closed
Closed
(with cap)
(with valve cap)
(with valve cap)
(with cap)
Pumping down
(Transfering)
Closed
Open
Open
Closed
(clockwise)
(with cap)
(counter-clockwise)
(connected
manifold gauge)
Open
Evacuation
(Servicing)
Open
Open
Open
Open
Open
Open
Open
Open
Open
3.
4.
(connected
(connected
manifold gauge)
manifold gauge)
Gas charging
(Servicing)
Open
Closed
(with cap)
(with charging
cylinder)
Open
Pressure check
(Servicing)
Open
5.
6.
(connected
(connected
manifold gauge)
manifold gauge)
Open
Gas releasing
(Servicing)
Open
(connected
(connected
manifold gauge)
manifold gauge)
Service Manual 47
(3-way) Valve
(1) Pumping down
Liquid side
3-Way
Indoor unit
Outdoor unit
Open
valve
Gas side
Closed
3-Way
valve
Lo
CLOSE
CLOSE
Purge the air
• Procedure
6. Operate the air conditioner at the cooling cycle
For pumping down,firstly short the Low Pressure
s/w at the outside and then operate below proce-
dure.
1. Confirm that both the gas side and liquid side
valves are set to the open position.
2
and stop it when the gauge indicates 1kg/cmg.
7. Immediately set the gas side valve to the closed
position.
- Do this quickly so that the gauge ends up indi-
- Remove the valve stem caps and confirm that
the valve stems are in the raised position.
cating 1kg/
g (14 psig).
8. Disconnect the charge set, and mount the liquid
side and gas side valve caps and the service
port nut.
- Be sure to use a hexagonal wrench to operate
the valve stems.
- Use torque wrench to tighten the service port
nut to a torque of 1.8kg.m.(13 lb-ft).
2. Operate the unit for 10 to 15 minutes.
3. Stop operation and wait for 3 minutes, then con-
nect the manifold gauge to the service port of
the gas side valve.
- Be sure to check for gas leakage.
- Connect the hose of the gauge with the push
pin to the service port.
4. Air purging of the charge hose.
- Open the Low-handle valve on the gauge
slightly to air purge from the hose.
5. Set the liquid side valve to the closed position.
• Be sure to short pressure S/W. otherwise Low pressure S/W detect low pressure skete and stops the compressor.
48 Ceiling Cassette Air Conditioner
(3-way) Valve
(2) Evacuation
(All amount of refrigerant leaked)
Liquid side
Indoor unit
Outdoor unit
2-Way
valve
Open
Gas side
3-Way
valve
Open
Vacuum pump
Lo
OPEN
CLOSE
• Procedure
6. Disconnect the charge hose from the vacuum
pump.
1. Confirm that both the liguid side valve and gas
side valve are set to the opened position.
- Vacuum pump oil.
If the vacuum pump oil becomes dirty or deplet-
ed,replenish as needed.
2. Connect the vaccum pump to the center hose of
the manifold gauge.
3. Connect the service port of the gas side valve to
the low side of the gauge.
7. Mount the valve caps and the service port caps.
4. Evacuation for approximately one hour.
- Confirm that the gauge needle has moved
toward-76 cmHg (vacuum of 4 mmHg or less).
5. Close the Low handle of the gauge turn off the
vacuum pump, and confirm that the gauge nee-
dle does not move(approximately 5 minutes
after turning off the vacuum pump).
Service Manual 49
(3-way) Valve
(3) Gas Charging
(After Evacuation)
Liquid side
2-Way
Indoor unit
Outdoor unit
Open
valve
Gas side
Open
3-Way
valve
Check valve
Charging
cylinder
Lo
(1)
OPEN
CLOSE
• Procedure
1. Connect the gauge to the charging cylinder.
4. Immediately disconnect the charge hose from
the gas side valve's service port.
- Connect the charge hose which you disconnect-
ed 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.
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.
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.
- 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.
3. Open the low handle on the gauge and charge
the system with liquid refrigerant.
- If the system can not be charged with the speci-
fied amount of refrigerant, it can be charged
with a little at a time (approximately 150g(5.3oz)
each time) while operating the air conditioner in
the cooling cycle; however, one time is not suffi-
cient, 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.(13 lb-ft).
- Be sure to check for gas leakage.
50 Ceiling Cassette Air Conditioner
Electronic Control Device
Electronic Control Device
• Main P.C.B ASM
<Indoor>
<Outdoor>
Service Manual 51
Specifications and performance data subject to change without notice.
03/19/07
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