Heat Controller Inc Air Conditioner DMC36CA 1 User Manual

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)(25) 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 doesnt 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 10k/ 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 : 10K/ 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 : 5K/ 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 : 5K/ at 25°C(77°F) (Unplugged)  
Normal voltage : 2.5Vdc / at 25°C(77°F) (plugged)  
10k  
2.5Vdc  
V
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 10K/ 5Kat 25°C(77°F), then sensor is normal.  
4. If the resistance of the sensor is 0 Kor , 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  
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 2M)  
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 : 200K/ 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 : 10K/ 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 : 5K/ 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 : 5K/ 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 : 200K/ 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 : 10K/ 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 kor , then sensor is abnormal.  
If the voltage of the sensor is 0 V or 5Vdc, then sensor is abnormal.  
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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