Room Air Conditioner
SVC MANUAL(General)
MODEL : General Wall Mounted-Inverter Type
CAUTION
Before Servicing the unit, read the safety precautions in this SVC manual.
Only for authorized service personnel.
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Part 1 General Information
1. Safety Precautions ............................................................................................................4
2. Nomenclature......................................................................................................................7
Service Manual 3
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Part 1 General Information
1. Safety Precautions
To prevent injury to the user or other people and property damage, the following instructions must be followed.
I Incorrect operation due to ignoring instruction will cause harm or damage. The seriousness is classified by the follow-
ing indications.
This symbol indicates the possibility of death or serious injury.
This symbol indicates the possibility of injury or damage to properties only.
I Meanings of symbols used in this manual are as shown below.
Be sure not to do.
Be sure to follow the instruction.
Dangerous Voltage
1.1 Cautions in Repair
Be sure to disconnect the power cable plug from the plug socket before disas-
sembling the equipment for a repair.Internal components and circuit boards are at
main potential when the equipment is connected to the power cables. This high
voltage is extremely dangerous and may cause death or severe injury if come in
contact with it.
Do not touch the discharging refrigerant gas during the repair work.
The discharging refrigerant gas.The refrigerant gas can cause frostbite.
Release the refrigerant gas completely at a well-ventilated place first.
Otherwise, when the pipe is disconnected, refrigerant gas or refrigerating
machine oil discharges and it Can cause injury.
When the refrigerant gas leaks during work, perform ventilation. If the refrigerant
gas comes in contact with a fire, poisonous gas generates. A case of leakage of
the refrigerant and the closed room full with gas is dangerous because a short-
age of oxygen occurs. Be sure to perform ventilation.
When removing the front panel or cabinet, execute short-circuit and discharge
between high voltage capacitor terminals. If discharge is not executed, an electric
shock is caused by high voltage resulting in a death or injury.
Do not turn the air-conditioner ON or OFF by plugging or unplugging the power
plug. There is risk of fire or electrical shock.
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Part 1 General Information
Do not use a defective or underrated circuit breaker. Use the correctly rated
breaker and fuse. Otherwise there is a risk of fire or electric shock.
Install the panel and the cover of control box securely. Otherwise there is risk of
fire or electric shock due to dust, water etc.
Indoor/outdoor wiring connections must be secured tightly and the cable should
be routed properly so that there is no force pulling the cable from the connection
terminals. Improper or loose connections can cause heat generation or fire.
Do not touch, operate, or repaire the product with wet hands. Holding the plug by
hand when taking out. Otherwise there is risk of electric shock or fire.
Do not turn on the breaker when the front panel and cabinet are removed.
Be sure to ground the air conditioner with an earthing conductor connected to
the earthing terminal.
Conduct repair works after checking that the refrigerating cycle section has
cooled down sufficiently. Otherwise, working on the unit, the hot refrigerating
cycle section can cause burns.
Do not tilt the unit while removing panels. Otherwise, the water inside the unit
can spill and wet floor.
Do not use the welder in a well-ventilated place. Using the welder in an enclosed
room can cause oxygen deficiency.
Be sure to turn off power switch before connecting or disconnecting connector,
or parts damage may be occur.
Service Manual 5
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Part 1 General Information
1.2 Inspections after Repair
Check to see if the power cable plug is not dirty or loose. If the plug is dusty or
loose it can cause an electrical shock or fire.
Do not use a joined power cable or extension cable, or share the same power
outlet with other electrical appliances. otherwise, it can cause an electrical shock,
excessive heat generation or fire.
Do not insert hands or other objects through the air inlet or outlet while the prod-
uct is operating. There are sharp and moving parts that could cause personal
injury.
Do not block the inlet or outlet of air flow. It may cause product failure
Check to see if the parts are mounted correctly and wires are connected.
Improper installation and connections can cause an electric shock or an injury.
Check whether the installation platform or frame has corroded. Corroded installa-
tion platform or frame can cause the unit to fall, resulting in injury.
Be sure to check whether the earth wire is correctly connected.
After the work has finished, be sure to do an insulation test to check whether the
resistance is 2[Mohm] or more between the charge section and the non-charge
metal section (Earth position). If the resistance value is low, a disaster such as a
leak or electric shock is caused at user’s side.
Check the drainage of the indoor unit after the repair. If drainage is faulty the
water may enter the room and wet floor.
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Part 1 General Information
2. Nomenclature
2.1 Global Model Name
A S
2
W 1 2 6 4 G G 1
10
1
-
3
4
5
6
7
8
9
Code
Type
Code of Model
Meaning
L: Chang-won R22
1
Production Center,
Refrigerant
A~Z
A: Chang-won R410A
2
3
Product Type
A~Z
A~Z
S: Split Type Air Conditioner
Cooling/Heating/Inverter
C: Cooling Only
H: Heat Pump
X: C/O + E/Heater
Z: H/P + E/Heater
V: AC Inverter C/O
N: AC Inverter H/P
Q: DC Inverter C/O
W: DC Inverter H/P
4, 5
6
Capacity
0~9
Cooling/Heating Capacity
Ex. "09" ¡ 9,000 Btu/h
Electric Range
1~9
A~Z
1: 115V/60Hz
2: 220V/60Hz
3: 208-230V/60Hz
5: 200-220V/50Hz
6: 220-240V/50Hz
7: 110V, 50/60Hz
7
8
Chassis
Look
A~Z
A~Z
Name of Chassis
Look,
Color (Artcool Model)
9, 10
Function
A~Z
A
B
C
D
E
F
Basic
Basic+4Way
Plasma Filter
Plasma Filter+4 Way
Tele+LCD
Tele+LCD+Nano plasma+4Way
NBF F+(A/changeove)+A/clean+Low A
NBF F+(A/changeove)+A/clean+4way+Low A
Tele+LED+4way
G
H
I
J
Internet
K
L
Plasma F+4Way+Oxygen generator
NBF F+(A/changeove)+A/clean
NBF F+(A/changeove)+A/clean+4way
NBF F+(A/changeove)+A/clean+PTC
NBF F+(A/changeove)+Autoclean+4way+PTC
NBF F+(A/changeove)+A/clean+4way+Low A+PTC
Negative ion+A/Clean
M
N
P
Q
R
S
T
U
V
W
Y
(Nano)Plasma+Negative ion+A/Clean
4way+(Nano)Plasma F+Negative ion+A/Clean
Nano Plasma F+4Way+(A/changeove)+A/clean+Oxygen generator
4way+(Nano)Plasma F+Negative ion+A/Clean+Oxygen generator
Dry contact
Basic + Low A
11
Serial No.
1~9
LG Model Development Serial No.
Service Manual 7
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Part 2 Functions & Controls
1. List of Controls & Functions ..........................................................................................9
2. Basic Mode Controls......................................................................................................10
3. Special Mode Controls...................................................................................................12
4. Utility Functions .............................................................................................................13
5. Protection Functions & Controls .................................................................................16
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Part 2 Functions & Controls
1. List of Functions & Controls
Category
Function
Description
Remark
Cooling Mode
Heating Mode
Healthy Dehumidification
Automatic operation
Auto Changeover
Cooling operation
Heating operation
Dry operation
Automatic operation
Cooling mode is automatically changed to heating mode and
vice verse
Basic mode
controls
Jet Cool
Jet Heat
Powerful cooling mode
Powerful heating mode
Special Mode
controls
Energy saving
Air volume & set temp. are automatically selected for saving
energy in cooling mode
Cooling Mode Only
Forced operation
Auto Clean
Operation without remote controller
After cooling operation, this function makes the evaporator
dry
Air volume control
Natural Air control
Chaos Swing
Indoor Fan speed Control
Air volume control Program
Vertical Airflow Direction control
Utility Functions
Sleep mode Auto control
Air volume & set temp. are automatically changed for com-
fortable sleep
Auto Restart Function
When power returns after a power failure, Unit restarts in the
previous operating mode
Five Second Delay (Fan)
For noise prevention
Two Minutes Stand-by
(Comp.)
For overload prevention
Hot Start
To prevent cold wind blow on heating mode start
Evaporator frost prevention
Condenser frost prevention
Freeze prevention
Automatic Defrost
Power Relay Control
Over current prevention
Inverter (with inverter
power control)
Overheating Protection
(Power Module)
Total Current Control
(Over Current Protection)
Modulation of voltage & frequency
Protection
Controls &
Functions
To protect power module
To protect power device
To protect power module
DC Peak Control
Discharge Pipe Temp Control For overheating protection
Low Ambient Function
Oil Return Control
Oil Equalizing Control
For operation at low temp.
To protect compressor
To protect compressor
NOTE: The Exploded View SVC Manual has the particular Function table for each model.
Service Manual 9
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Part 2 Functions & Controls
2. Basic Mode Controls
2.1 Cooling Mode
Thermo ON
Thermo OFF
+0.5°C(1°F)
Setting
Temp.
-0.5°C(-1°F)
INV. Comp.
High
Low
Comp. OFF
High
Low
Frequency
• Operating frequency of compressor depends on the load condition, like the difference between the room temp. and
the set temp., frequency restrictions.
• If the compressor operates at some frequency, the operating frequency of compressor cannot be changed within 30
seconds. ( not emergency conditions)
• Compressor turned off when
- intake air temperature is in between 0.5°C( 1°F) of the setting temp. limit for three minutes continuously.
- intake air temperature reaches below 1.0°C(2°F) of the temperature of setting temp..
• Compressors two minutes time delay.
- After compressor off, the compressor can restart minimum 2 minutes later.
2.2 Heating Mode
Thermo OFF
T2°C(T4°F).
Thermo ON
T1°C(T2°F).
Setting
Temp.
INV. Comp.
Frequency
High
Low
Comp. OFF
High
Low
Comp. OFF
• Operating frequency of compressor depend on the load condition, The difference between the room temp. and set
temp., frequency restrictions.
• If compressor operates at some frequency, the operating frequency of compressor cannot be changed within 30 sec-
onds.
• Condition of compressor turned off
- When intake air temperature reaches +T2°C(T4°F) above the setting temperature.
• Condition of compressor turned on
- When intake air temperature reaches +T1°C(T2°F) above the setting temperature.
* Condition of indoor fan turned off
- While in compressor on : indoor pipe temp. < 20°C(68°F)
- While in compressor off : indoor pipe temp. < 30°C(86°F)
• While in defrost control, the indoor and outdoor fans are turned off.
• Compressor 2minutes delay
- After compressor off, the compressor can restart minimum 2 minutes later.
• T1 and T2 may be changed by models
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Part 2 Functions & Controls
2.3 Healthy Dehumidification operation
• When the dehumidification operation is set by the remote controller, the intake air temperature is detected and the set-
ting temp. is automatically set according to the intake air temperature.
Intake air Temp.
26°C(78.8°F) ≤ intake air temp.
Setting Temp.
25°C(77°F)
24°C(75.2°F) ≤ intake air temp.< 26°C(78.8°F)
22°C(71.6°F) ≤ intake air temp. < 24°C(75.2°F)
18°C(64.4°F) ≤ intake air temp. < 22°C(71.6°F)
intake air temp. < 18°C(64.4°F)
intake air temp. -1°C(-2°F)
intake air temp. -0.5°C(-1°F)
intake air temp.
18°C(64.4°F)
•
When intake air temp. is 1 C(2 F) above the setting temp., condition of compressor is same as in cooling mode operation.
• When intake air temperature reaches 1 C(2 F) below the setting temp., compressor operates in step1~step3 and the
indoor fan speed again operates at low speed or comes to a stop.
2.4 Automatic operation
• When the Auto operation is set by the remote controller, the intake air temperature is detected and the setting temp. is
automatically set according to the intake air temperature and operation mode.
• The air volume is automatically set according to the intake air temperature.
2.5 Auto changeover operation
• The air conditioner changes the operation mode automatically to keep indoor temperature steady.
• When room temperature vary over 2°C( 4°F) with respect to setting temperature, air conditioner keeps the room tem-
perature in 2°C( 4°F) with respect to setting temperature by changing the mode from cooling to heating and vice
versa.
Switching point
+4°C(+8°F)
+2°C(+4°F)
Heating thermo off
+0.5°C(+1°F)
Setting
Temp.
Cooling thermo off
Switching point
-0.5°C(-1°F)
-2°C(-4°F)
Cooling
operation
Cooling
operation
Mode
Heating operation
Service Manual 11
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Part 2 Functions & Controls
3. Special Mode Controls
3.1 Jet Cool operation
• In the heating mode or Fuzzy operation, the Jet cool function does not work.
When it is input while in other mode of operation (cooling, dehumidification, ventilation), the Jet cool operation takes
place.
• In the Jet cool mode, the indoor fan is operated at super-high speed for 30 min. at cooling mode operation.
• In the Jet cool mode, the room temperature is maintained at a setting temperature of 18°C(64.4°F).
• When the sleep timer mode is input during the Jet cool operation, the Jet cool mode has the priority.
• When the Jet cool button is pressed, the upper/lower vane of the unit is reset to those of the initial cooling mode and
then operate so that the air outflow could reach further.
3.2 Jet Heat operation
• While in cooling mode or Fuzzy operation, the Jet Heat function does not work.
When it is input while in the Heating mode operation (dehumidification), the Jet Heat mode operation takes place
• In the Jet Heat mode, the indoor fan operated at super-high speed for 60 min. at Heating mode operation.
• In the Jet Heat mode, the room temperature is maintained at a temperature of 30°C(86°F).
• When the sleep timer mode is input during the Jet Heat mode operation, the Jet Heat mode has the priority.
• When the Jet Heat button is pressed, the upper/lower vane of the unit is the unit reset to those of the initial Jet heating
mode and then operates so that the air outflow could reach under flow.
3.3 Energy saving operation in cooling mode
• During cooling and dehumidification mode of operation, the Energy saving button can be input.
• In this operation, before we feel cold the set temperature and air volume is set automatically to save energy.
• The operation time and the other thing was decided by experiment.
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Part 2 Functions & Controls
4. Utility Functions
4.1 Forced operation
• To operate the appliance manually in case when the remote control is lost, the forced operation selection switch is on
the main unit of the appliance, and operate the appliance in the standard conditions.
• The operating condition is set according to the outdoor temp. and intake air temperature as follows.
Setting speed of
Operating Mode
Setting temp.
Indoor temp.
indoor fan
Cooling
Healthy Dehumidification
Heating
22°C(71.6°F)
23°C(73.4°F)
24°C(75.2°F)
over 24°C(75.2°F)
21~24°C(69.8~75.2°F)
below 21°C(69.8°F)
High speed
• The unit select the last operation mode in 3 hours.
• Operating procedures when the remote control can't be used is as follows :
- The operation will be started if the ON/OFF button is pressed.
- If you want to stop operation, re-press the button.
- The ON/OFF switch is on the display PCB or side of indoor unit
4.2 Auto cleaning operation
• Function used to perform Self Cleaning to prevent the Unit from Fungus and bad odor.
• Used after the Cooling Operation before turning the unit off, clean the Evaporator and keep it dry for the next opera-
tion.
• The function is easy to operate as it is accessed through the Remote controller.
ON
Unit
Operation
OFF
ON
Indoor
OFF
Fan
Setting step
L Low
OFF
ON
Comp.
Time
OFF
13~14 minutes
1 minute
2~3 minutes
Service Manual 13
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Part 2 Functions & Controls
4.3 Air volume control
• Indoor fan motor control have 6 steps.
Step
Description
LL
L
Very low, In heating mode
• Air volume is controlled "SH", "H", "Med", "Low" by the remote con-
troller.
Low
Med
• "LL" step is selected automatically in Hot start operation.
M
H
High
SH
Auto
Super high
Natural wind
4.4 Natural Air Control(Auto Wind)
• When the Auto Step is selected and then operated, the high, medi-
um, or low speed of the airflow mode is operated for 2~15 sec. ran-
domly by the Chaos Simulation.
4.5 Chaos Swing
• By the Chaos swing key input, the upper/lower vane automatically operates with the Chaos swing or it is fixed to the
desired direction.
(S4, SE) 9,12kBtu/h Model
Cooling Operation
Heating Operation
CLOSED
CLOSED
110°
110°
Mode8
Mode7
Mode6
Mode5
Mode4
Mode3
Mode8
Mode7
Mode6
Mode5
Mode4
Mode3
Start
Start
Mode2
Mode1
Mode2
Mode1
8°
8°
OPEN
OPEN
(S5) 18, 24kBtu/h Model
Heating Operation
Cooling Operation
CLOSED
CLOSED
120°
120°
Mode9
Mode8
Mode7
Mode6
Mode5
Mode4
Mode9
Mode8
Mode7
Start
Mode6
Start Mode5
Mode4
Mode3
Mode2
Mode1
OPEN
8°
Mode3
Mode2
8°
OPEN
(SD) 30kBtu/h Model
Cooling Operation
Heating Operation
CLOSED
CLOSED
110¡
110¡
Mode
Mode
Mode
Mode
Mode
8
7
6
5
4
Mode
Mode
Mode
Mode
Mode
8
7
6
5
4
Start
Start
Mode
Mode
Mode
3
Mode
Mode
Mode
3
2
2
8¡
8¡
1
1
OPEN
OPEN
NOTE: Some Models are different by swing width and swing pattern.
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Part 2 Functions & Controls
4.6 Sleep mode Auto control
• When the set sleep time is reached set time of [1,2,3,4,5,6,7hour] input by the remote control during the operation, the
operation of the appliance stops.
• When the appliance is on pause, the sleep timer mode cannot be input.
4.6.1 Sleep timer operation for cooling cycle
• While in cooling mode , 30 min. after the start of the sleep timer, the setting temperature increases by 1 C(2
.
After another 30minutes lapse, it increases again by 1°C(2
.
Setting temp. (˚C)
1.0˚C(2˚F) up
1.0˚C(2˚F) up
Cooling ON temp.
(Setting temp. +0.5˚C(+1˚F))
Cooling OFF temp.
(Setting temp. -0.5˚C(-1˚F))
(
)
0.5
1
Sleep time hour
4.6.2 Sleep timer operation for heating cycle
• While in heating mode, 60 min. after the start of the sleep timer, the setting temperature decreases by 1 C(2
.
After another 60minutes lapse, it decreases again by 1°C(2
.
Setting temp. (°C)
Heating ON temp.
(Setting temp)
1.0°C(2°F) down
1.0°C(2°F) down
Heating OFF temp.
(Setting temp. +4.0°C(+8°F))
(
)
1
2
Sleep time hr
4.7 Auto restart
• When the power comes back after a sudden power failure during operation, the mode before the power failure is kept
on the memory of the appliance and it automatically operates in the saved mode on the memory.
• Operation mode that is kept on the memory
- State of operation ON/OFF
- Operation mode/setting temp./selected airflow speed
- Sleep timer mode/remaining time of sleep timer
- Chaos Swing
Service Manual 15
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Part 2 Functions & Controls
5. Protection Functions & Controls
5.1 Five Seconds Stand-by (fan)
• The indoor unit fan rotates after 5 seconds when unit is turned on.
5.2 Two Minutes Stand-by (comp.)
• Compressor starts two minutes later, after it is turned off
5.3 Hot start
• When unit starts in the heating mode to prevent cold wind blowing, the indoor fan does not rotate until the temp. of
heat exchanger reaches 30°C(86°F)(model by model)
5.4 Freeze prevention (Protection of the evaporator pipe from frosting)
• If the indoor pipe temperaure is below 0°C(32°F) in 7 min. after the compressor operates without pause while in cool-
ing cycle operation mode, ➔ compressor, outdoor fan are turned off.
• When indoor pipe temp. is 7°C(44.6°F) or higher after 2 min pause of compressor ➔ compressor, outdoor fan is turned
on according to the condition of the room temperature.
Indoor pipe
temp.
Comp. free
Comp. off
6˚C(42.8˚F)
7˚C(44.6˚F)
Comp. Step 4
Comp. Step 2
3˚C(37.4˚F)
T1
T1: 0 ~ 2°C(32~35.6°F)
NOTE: Some Models are different by T1.
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Part 2 Functions & Controls
5.5 Automatic defrost
5.5.1 9,12kBtu/h Model
• While in heating mode operation in order to protect the evaporator pipe of the outdoor unit from freezing,
reversed to cooling cycle to defrost the evaporator pipe of the outdoor unit.
• Defrosting control is available 40 minutes later since heating cycle started and the difference of the pipe tem-
perature of outdoor unit reaches above option 1.
• The defrosting control is available without reference to heating operation time only if the pipe temperature of
outdoor unit reaches below option 2.
The mean outdoor
temperature
-10˚C(14˚F) less than -10~-5˚C(14~23˚F) between -5~0˚C(23~32˚F) between 0˚C(32˚F) more than
Option 1
>4
>5
>5
>5
Expected heating operating time
And Heating operating time 40 minutes
The minimum Time of
Heating(sec)
Option 2
-30
-30
-25
-25
Minimum Time
Of Heating
Main Deice time
5sec
5sec
30sec 10sec
1min
Setting
Freq.
Setting Freq.
Operating
Freq. Of
Comp
Step 5 (Option)_(13)
Step 3 (Option)_(15)
Min (Option)_(12)
Min (Option)_(12)
(Comp off
Inapplicable.)
off
Operating
Freq. Of
Comp
Setting Freq.
15sec
Step 5 (Option)_(13)
Step 3 (Option)_(15)
(Comp off
Applicable.)
Min (Option)_(12)
Min (Option)_(12)
off
off
The Degree
of Superheat
Control
300 (Option)_(14)
Starting Step
EEV
Open step
ON
ON
4-Way
OFF
Setting
Speed
Setting
Speed
Indoor
FAN
Hi Speed
Setting
Speed
Indoor
FAN
Hot
Start
Super low speed
°
low speed
OFF
Pre-Heat
LED
ON
OFF
OFF
Deice STEP
0
1
2
3
4
5
6
Service Manual 17
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Part 2 Functions & Controls
5.5.2 18,24,30kBtu/h Model
• Starting to the defrosting operation
1) Defrost operation will be start when the conditions below are matched
a) Accumulation time of operation and the period after completion of defrost = 35 min.
b) After 10 minutes from re-starting the compressor .In case of being over 35 minutes of accumulated operating
time, defrosting operation starts after 10 minutes.
c) Piping temperature of the outdoor heat exchanger maintain below defrost starting temperature for 4 minutes
after 35 minutes continuous operation.
d)In case of passing 10 minutes after oil recovery operation
2) Outdoor piping temperature is below than –6°C (21.2°F, Option) for starting defrosting operation.
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Part 2 Functions & Controls
• Defrosting Control Algorithm
1) Lowering the compressor frequency when starts the defrosting operation.
Constant speed compressor is ON after 10 seconds from the arrival time of 30 Hz (Option) frequency and is
speed up its revolution till 100 Hz (Option)
2) Every EEV have 350 pulse (Option) of opening when starts defrosting operation.
3) Reversing valve is OFF after 5 seconds from arriving the compressor operating frequency of 30 Hz and then
fans of indoor units turn OFF.(including the indoor unit with being OFF except the remote controller is being
OFF)
4) After 5 seconds from the time arriving 30 Hz, fans of outdoor unit turn OFF and Hot Gas bypass/Oil separator
valve turn ON.
NOTE: Comp.frequency and EEV pulse is different each models.
• Control algorithm of defrost completion
1) Frequency of compressor lowering to 30 Hz and maintain constant speed operation with 30 Hz for 75 seconds
and then stating operation. If the constant speed compressor is OFF, it will be receive OFF signal after 5 sec-
onds from the arrival time of 30 Hz.
2) The EEV will open with the standard previous pulse after 5 seconds from the time of 30 Hz.
3) Reversing valve is ON after 15 seconds from the time of 30 Hz of compressor frequency.
4) Fan of outdoor unit is ON with high speed and maintain it after 5 seconds from the time of 30Hz.
5) Hot Gas bypass valve/Oil separator bypass valve make OFF after 75 seconds from the time of 30Hz.
NOTE: Comp.frequency and EEV pulse is different each models.
Service Manual 19
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Part 2 Functions & Controls
5.6 Power Relay Control
• Power relay turns on 1 second later after the power is supplied to the outdoor unit.
• Control sequence : power on ¡ PTC operating ¡ power relay on
5.7 Inverter
U V
W
+
U
V
3Ø
Comp.
Motor
W
1. The single phase power AC is converted into DC.
2. The single phase power DC is converted into a three phase chopped DC voltage with a variable frequency.
3. When the frequency changes, the rotation speed of the compressor changes resulting in an changed refrigerant circu-
lation. This leads to changeable amount of the heat exchange per unit.
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Part 2 Functions & Controls
5.8 Overheating Protection (Power Module)
5.8.1 9,12kBtu/h Model
• If the temperature of the heat sink thermistor. reaches over Toff, the Compressor stop instantly.
• The compressor operating frequency is limited according to the heat sink thermistor. (refer to below FIG.)
• It will blink 4 times, when the thermistor is open or short, also when the temperature is over T off.
∆T = (T off - T on)/3
Heat Sink Temp.
T1 = T on + ∆T
T2 = T on + 2 ∆T
*
T off °C
T2 °C
T1 °C
T on °C
COMP
Freq.
Free Fc-1 Fc-2
Fc-1
Fc-2
OFF
Free
T on : 85°C(185°F) (Model by Model)
T off : 95°C(203°F) (Model by Model)
NOTE: Some Models are different by Ton, and Toff.
Service Manual 21
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Part 2 Functions & Controls
5.8.2 18,24,30kBtu/h Model
• Function
: Power module failure protection by checking the temperature of heat sink.
There is a temperature sensor for checking the heat sink temperature.
• Heat sink sensor failure error
Short Check : if temperature ≥130°C(266°F)
Open Check : if temperature < - 30°C(-22°F)
System will go in self diagnosis (Error code 65) is displayed and product stops.
• Heat sink temperature control
a) Heat sink temperature < T2
b) T2 ≤ heat sink temperature < Toff : Compressor frequency down by 5 Hz
c) Heat sink temperature ≥ Toff : Compressor will be off.
: No limitation on compressor frequency
System will stop if this situation occurs 5 times in 1 hour and error code will be generated also self diagnosis will
start.
If high temperature situation occurs 5 times in 1 hr system counts 1 error and after that 4 times if this situation
occurs system stops and give error code.
If the temperature reached Toff condition system will count 5 times after that and system will stop with error
code.
Heat Sink temp
Toff=85°C(185°F)
T2=75°C(167°F)
T1=70°C(158°F)
Set
frequency
Set
frequency
Set
frequency
5 Hz
Down
5 Hz
Down
COMP
Hz
OFF
22 Room Air Conditioner
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Part 2 Functions & Controls
5.9 Total Current Control (Over Current Protection)
5.9.1 9,12kBtu/h Model
1) CT1 control
• If the operating current reaches I1, the operating frequency of the compressor decreases.
• After decreasing the operating frequency by 1step, if operating current is below I1 for 60 seconds continuously, the
operating frequency of compressor increases by 1step.
2) CT2 control
• If the operating current of the appliance reaches I2, the compressor stop instantly and two minutes later the compres-
sor restarts again.
• If CT2 occurs 5 times within one hour, the appliance turn off and displays ERROR CODE 7.
- I1 :Current of operating frequency down(5.5A ~ 12.0A)
- I2 : Current of compressor cut off(9.0A ~ 14.0A)
* ( I1, I2 depends on model )
Service Manual 23
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Part 2 Functions & Controls
5.9.2 18,24,30kBtu/h Model
1) Detection : check the output DC voltage of Current Transformer(CT).
2) Current Transformer Sensing Error
a) In initial power input, if the CT output is over 4.0V (25A) it shows.
Error Code 40 (defect in CT sensing)
3) CT 1 detection :
a) If total current exceeds CT1 value.reduce 1 step of operating Hz.
- Step down 10Hz from current step.
- If new Hz is below (cooling : Fc min,, heating :Fh min), then turn off the compressor.
b) After step down,if the total current exceed „1 for more than 5 sec. then step down 1 more step.
c) If the current continue below „1 for more than 1 min.,return the Hz to setting Hz.
4) CT 2 detection :
a) If total current exceeds CT2 turn off compressor.
And after 3 min turn on the compressor and check the current again.
b) If CT2 occurs 5 times in 1 hour,stop the operation and shows Error Code 22
Model
(kBtu/h)
Cooling
(CT 1)
Heating
(CT 1)
CT 2
18~30
11A
12A
14A
24 Room Air Conditioner
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Part 2 Functions & Controls
5.10 DC Peak control
5.10.1 DC Peak Current Error by a fault signal of IPM
• If the operating current of IPM reaches 35A 3A, the compressor stops instantly.
• If DC PEAK occurs 5 times within 1 hour, the appliance turns off and displays Error Code 6(9,12kBtu/h Model) / Error
Code 21(18,24,30kBtu/h Model).
5.10.2 DC Peak Current Error by the compressor lock
• If the DC LINK voltage below DC 140V occurs 5 times within 1 hour while the compressor is operating, the appliance
turns off and display Error Code 6(9k,12k Model) / Error Code 23(18k,24k,30k Model).
5.10.3 DC Peak Current Error by the Outdoor Fan Lock
• If this problem occurs 5 times within 1 hour in case of the temperature of outdoor pipe TH is over 65°C(149°F) while
the compressor is operating, the appliance turns off and displays Error Code 6(9,12kBtu/h Model) / Error Code
61(18,24,30kBtu/h Model).
5.11 Discharge Pipe Temp Control
5.11.1 9,12kBtu/h Model
• If the temperature of the discharge pipe of compressor reaches over 130°C(266°F) or below -30°C(-22°F) the com-
pressor stops instantly.
• The compressor operating frequency is limited according to the compressor dome TH. (Refer to below Fig.)
• Temperature range of COMP SPEC varies by 10°C(50°F).
∆T = (T off - T2)/2
D-Pipe Temp.
T1 = T2 - 2 ∆T
*
T off °C
T3 °C
T3 = T2 + ∆T
T2 °C
T1 °C
-13 °C(8.6°CF)
COMP Freq.
Free
Fc-1 Fc-2 OFF
Fc-2 Fc-1 Free
Fh min
T off : 110°C(230°F) ( Model by model )
T2 : 100°C(212°F) ( Model by model )
NOTE: Some Models are different by T1, and T2.
Service Manual 25
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Part 2 Functions & Controls
5.11.2 Inverter Compressor (18,24,30kBtu/h Model)
1) There can be two situations
(a) Sensor is failed (Error Code 41)
(b) Abnormal high temperature discharge temperature (error code for high discharge will be generated)
Both cases unit will stop.
2) Compressor working
(a) If discharge pipe temperature T1 No limitation on compressor frequency
(b) T2 ≤ discharge pipe temperature T off (Hysteresis control) Compressor frequency down by 5Hz and expan-
sion valve up by 10 pulse in every 1 min.
(c) Discharge pipe temperature ≥ Toff Compressor will be off
System will stop if this situation occurs 5 times in 1 hour and error code will be generated.
D-Pipe temp
Toff(105)°C(221°F)
T2(95)°C(203)°F
T1(90)°C(194)°F
5 Hz
Down
5 Hz
Down
COMP
Hz
OFF
Set
Set
Set
Set
10
Pulse Up
10
Pulse Up
Expansion
valve
Set
Stop control
26 Room Air Conditioner
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Part 2 Functions & Controls
5.11.3 Constant Compressor (only 30kBtu/h Model)
1) There can be two situations
(a) Sensor is failed (Error Code 41)
(b) Abnormal high temperature discharge temperature (error code for high discharge will be generated)
Both cases unit will stop.
2) Compressor working
(a) If discharge pipe temperature < T1 Compressor ON, EEV on-time control
(b) T2 ≤ discharge pipe temperature < Toff (Hysteresis control) Expansion valve up by ßpulse every 1 min.
If EEV is in the starting control it will follow it as it is.
(c) Discharge pipe temperature ≥ Toff Compressor will be OFF
System will stop if this situation occurs 5 times in 1 hour and error code will be generated (Error Code 33).
Toff(105)°C(221)°F
D-Pipe temp
T2(95)°C(203)°F
T1(90)°C(194)°F
COMP
ON
ON
OFF
Stop
Step
10
Pulse
Up
On-time
control
On time
control
Expansion
valve
Service Manual 27
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Part 2 Functions & Controls
5.12 Low Ambient control
5.12.1 9,12kBtu/h Model
• If outdoor temperature drops below certain temperature, liquid back is prevented by reducing fan speed.
• It can prevent frosting of evaporator and keep cooling operation
• No matter even if the outdoor temperature reaches -10°C(14°F).
• You can Cool your room at your desired temperature all year around.
Outdoor temp.:-10°C(14°F)
25(77°F)
Comp Freq.
Cond . temp.
20(68°F)
Freq.
15(59°F)
Outdoor fan
10(50°F)
On
On
Outdoor pipe temp.
Outdoor fan On/Off control
5(41°F)
0°C outdoor fan On/Off
°
control
Off
0(32°F)
Off
0
50
100
150
Time(Min.)
200
Outdoor temp.
°…
0°C(32°F)
-5(23°F)
5.12.2 18, 24, 30kBtu/h Model
Low ambient cooling case : In this situation outdoor fan works in ON/OFF control.
: If the pipe temperature 0°C(32°F) and it is falling rapidly in that case compressor will run for 5 min & then it will
go in low ambient control. (❈ Temp. value can be different for each model.)
❈ After the system is stopped by CT cut or heat sink cut-off then the cycle returns to the normal condtiond control.
Outdoor pipe temp
(T2 = 0)°C
(T1 = 0)°C
O/D fan
Off
Off
Set speed
Set speed
Set speed
28 Room Air Conditioner
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Part 2 Functions & Controls
5.13 Oil return control(30kBtu/h Model)
5.13.1 Operating Contion
1) When the continuous running time is over 3hr.(option), oil returning operation is made for 3min.
In case of the initial operation, oil returning operation is made, after completing initial operation.
2) After defrost and oil returning operation, the continuous running time is resetted.
5.13.2 Operation Process
1) EEV-Full open, Hot gas bypass valve-On
2) Compressor Step-70Hz + Constant Comp. On(Option)
3) Reversing valve-Off(Process of Off/On, follows defrost operating.)
4) Outdoor Fan-Low step
5.14 Oil equalizing control(30kBtu/h Model)
Operating condition :
1) When the continuous inverter compressor running time at under 40 Hz(option) is over 2 hours(option) in 2 com-
pressor system, oil restoring operation is made.
2) If compressor operating Hz is below 40 Hz by the safety control, the accumulated time will be cleared and oil
restoration is not made.
3) During this operation,if operating Hz couldn’t be changed by safety control ,stop this operation.
Operating process : Raise the operating HZ up to 70,and after 20 sec.(option) recover to the last value.
Service Manual 29
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Part 3 Test Run
1. Check before Test Run...................................................................................................31
2. Test Run Flow chart .......................................................................................................32
3. Test Run Detail................................................................................................................33
30 Room Air Conditioner
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Part 3 Test Run
1. Check before Test Run
Check to see whether there is any refrigerant leakage, and check whether the power or transmission
cable is connected properly.
1
2
Check whether the liquid pipe and gas pipe valves are fully opened.
NOTE: Be sure to tighten caps.
Confirm that 500 V megger shows 2.0 MΩ or more between power supply terminal block and
ground. Do not operate in the case of 2.0 MΩ or less.
NOTE: Never carry out mega ohm check over terminal control board.
Otherwise the control board may break.
3
Immediately after mounting the unit or after leaving it turned off for an extended length of
time, the resistance of the insulation between the power supply terminal board and the
ground maydecrease to approx. 2.0 MΩ as a result of refrigerant accumulation in the internal
compressor.
If the insulation resistance is less than 2.0 MΩ, turn on the main power supply.
Service Manual 31
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Part 3 Test Run
2. Test Run Flow chart
START
Test operation for indoor unit
No
No
Operate the unit in cooling mode.
Does Test operation start?
Refer to part4, 7 Electric part
Refer to part4, 5 Cycle part
Yes
Is cold air discharged for
more than 3 minutes ?
Yes
Is there any temperature
difference between intake and
discharged air?
No
No
Yes
Is the operating current
normal ?
* Check the load (In/Out Temp.)
* Check pipe length and amount of
refrigerant
Yes
* Check for abnormal sound in
outdoor unit (comp.,Fan, others )
Operation mode change
to Heating mode
No
Refer to Troubleshooting
Guide
Is hot air discharged ?
After Hot Start
Yes
Normal
NOTE: When outdoor temperature is low,the unit is operated to Heating mode
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Part 3 Test Run
3. Test Run Detail
1. Check that all tubing and wiring have been properly con-
nected.
NOTE: If the actual pressure is higher than shown, the
system is most likely over-charged, and charge
should be removed.
2. Check that the gas and liquid side service valves are fully
open.
If the actual pressure are lower than shown, the
system is most likely undercharged, and charge
should be added.
Settlement of outdoor unit
The air conditioner is now ready for use.
• Anchor the outdoor unit with a bolt and nut(ø10mm) tightly
and horizontally on a concrete or rigid mount.
PUMP DOWN
• When installing on the wall, roof or rooftop, anchor the
mounting base securely with a nail or wire assuming the
influence of wind and earthquake.
This is performed when the unit is to be relocated or
the refrigerant circuit is serviced.
Pump Down means collecting all refrigerant in the outdoor
unit without loss in refrigerant gas.
• In the case when the vibration of the unit is conveyed to the
hose, secure the unit with an anti-vibration bushing.
CAUTION:
Be sure to perform Pump Down procedure with the unit in
Bolt
cooling mode.
Pump Down Procedure
1. Connect a low-pressure gauge manifold hose to the
charge port on the gas side service valve.
2. Open the gas side service valve halfway and purge the air
from the manifold hose using the refrigerant gas.
Tubing connection
3. Close the liquid side service valve(all the way in).
Evaluation of the performance
4. Turn on the unit's operating switch and start the cooling
operation.
Operate unit for 15~20 minutes, then check the system
refrigerant charge:
5. When the low-pressure gauge reading becomes 1 to
0.5kg/cm2 G(14.2 to 7.1 P.S.I.G.), fully close the gas side
valve stem and then quickly turn off the unit. At that time,
Pump Down has been completed and all refrigerant gas
will have been collected in the outdoor unit.
1. Measure the pressure of the gas side service valve.
2. Measure the temperature of the intake and discharge air.
3. Ensure the difference between the intake temperature and
the discharge is more than 8°C(46°F) (Cooling) or
(Heating).
5. Check operating current.
Intake temperature
Discharge air
6. Change operation mode and check.
Discharge
temperature
4. For reference; the gas side pressure of optimum condition
is as below.(Cooling)
Outside ambient
TEMP.
The pressure of the gas side
service valve.
Refrigerant
R22
R410A
35°C (95°F)
35°C (95°F)
4~5kg/cm2G(56.8~71.0 P.S.I.G.)
8.5~9.5kg/cm2G(120~135 P.S.I.G.)
Service Manual 33
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Part 4 Trouble Shooting
1. 2-Way, 3-Way Valve ........................................................................................................35
2. Pumping Down ..............................................................................................................36
3. Evacuation (All amount of refrigerant leaked) ............................................................37
4. Gas Charging (After Evacuation) .................................................................................38
5. Self-diagnosis Function.................................................................................................39
6. Cycle Troubleshooting Guide........................................................................................42
7. Electronic Parts Troubleshooting Guide......................................................................44
34 Room Air Conditioner
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Part 4 Trouble Shooting
1. 2-Way, 3-Way Valve
2-way Valve (Liquid Side)
3-way Valve (Gas Side)
Valve cap
Hexagonal wrench (4mm)
Open position
Closed position
Flare nut
Flare nut
Open position
Closed position
Pin
To
To
piping
piping
connection
Service
port cap
Service
port
connection
To outdoor unit
To outdoor unit
Works
Shaft position
Shaft position
Service port
Closed
(with valve cap)
Closed
(with valve cap)
Closed
(with cap)
Shipping
Air purging
Open
Closed
Open
1.
(Installation)
(counter-clockwise)
(clockwise)
(push-pin or with
vacumm pump)
Open
(with valve cap)
Open
(with valve cap)
Closed
(with cap)
Operation
Closed
(clockwise)
Open
Open
Pumping down
(Transfering)
(counter-clockwise) (connected manifold
gauge)
2.
3.
4.
Open
Open
Open
Open
Open
(with charging
cylinder)
Evacuation
(Servicing)
Open
(with charging
cylinder)
Gas charging
(Servicing)
Open
Pressure check
(Servicing)
(with charging cylinder)
Open
Open
Open
Open
5.
6.
Open
Gas releasing
(Servicing)
(with charging cylinder)
Service Manual 35
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Part 4 Trouble Shooting
2. Pumping Down
Liquid side
2-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
(1) Confirm that both the 2-way and 3-way valves
are set to the open position.
cycle and stop it when the gauge indicates
2
.
1kg/cm g.
– Remove the valve stem caps and confirm that
the valve stems are in the raised position.
– Be sure to use a hexagonal wrench to operate
the valve stems.
(7) Immediately set the 3-way valve to the closed
position.
– Do this quickly so that the gauge ends up indi-
2
.
cating 3 to 5kg/cm g.
(2) Operate the unit for 10 to 15 minutes.
(8) Disconnect the charge set, and mount the 2-
way and 3-way valve’s stem nuts and the ser-
vice port nut.
(3) Stop operation and wait for 3 minutes, then
connect the charge set to the service port of
the 3-way valve.
– Use torque wrench to tighten the service port
– Connect the charge hose with the push pin to
the service port.
.
nut to a torque of 1.8 kg m.
– Be sure to check for gas leakage.
(4) Air purging of the charge hose.
– Open the low-pressure valve on the charge set
slightly to air purge from the charge hose.
(5) Set the 2-way valve to the closed position.
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Part 4 Trouble Shooting
3. Evacuation (All amount of refrigerant leaked)
Liquid side
Indoor unit
Outdoor unit
3-Way
valve
Open
Gas side
3-Way
valve
Open
Vacuum pump
Vacuum
Gage
Lo
OPEN
OPEN
• Procedure
(1) Connect the vacuum pump to the center hose
of charge set center hose
(3) Close the valve (Lo side) on the charge set,
turn off the vacuum pump, and confirm that
the gauge needle does not move (approxima-
tely 5 minutes after turning off the vacuum
pump).
(2) Evacuation for approximately one hour.
– Confirm that the gauge needle has moved
toward 0.8 Torr.
(4) Disconnect the charge hose from the vacuum
pump.
– Vacuum pump oil.
If the vacuum pump oil becomes dirty or
depleted, replenish as needed.
Service Manual 37
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Part 4 Trouble Shooting
4. Gas Charging (After Evacuation)
Liquid side
Indoor unit
Outdoor unit
Open
3-Way
valve
Gas side
Open
3-Way
valve
Check valve
OPEN
Charging
cylinder
Vacuum
Gage
Lo
(1)
CLOSE
• Procedure
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.
(1) Connect the charge hose to the charging
cylinder.
– Connect the charge hose which you dis-con-
nected from the vacuum pump to the valve at
the bottom of the cylinder.
– If you are using a gas cylinder, also use a
scale and reverse the cylinder so that the sys-
tem can be charged with liquid.
(4) Immediately disconnect the charge hose from
the 3-way valve’s service port.
(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 refriger-
ant). 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 valve (Lo side on the charge set and
charge the system with liquid refrigerant.
– If the system can not be charged with the spec-
ified amount of refrigerant, it can be charged
with a little at a time (approximately 150g each
time) while operating the air conditioner in the
cooling cycle; however, one time is not 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.
– Be sure to check for gas leakage.
38 Room Air Conditioner
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Part 4 Trouble Shooting
5. Cycle Troubleshooting Guide
Trouble analysis
1. Check temperature difference between intake and discharge air, and operating current.
Temp. difference
Current
: approx. 0°C(1°F)
: less than 80% of
rated current
All amount of refrigerant leaked out.
Check refrigeration cycle.
Temp. Difference
Operating Current
Refrigerant leakage
Clog of refrigeration cycle
Defective compressor
Temp. difference
Current
: approx. 8°C(16°F)
: less than 80% of
rated current
Temp. difference
Current
: less than 8°C(16°F)
: near the rated
current
Excessive amount of refrigerant
Temp. difference : over 8°C(16°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.
Service Manual 39
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Part 4 Trouble Shooting
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
Lower
Normal
Excessive amount of
refrigerant
High pressure does not quickly
rise at the beginning of operation.
Insufficient amount of
refrigerant(Leakage)
Clogging
Current is low.
Higher
NOTICE
2
.
1. The suction pressure is usually 8.5~9.5 kg/cm g at normal condition.
2. The temperature can be measured by attaching the thermometer to the low pressure tubing and wrap it with
putty.
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Part 4 Trouble Shooting
6. Electronic Parts Troubleshooting Guide
The Product doesn’t operate at all. (9~30kBtu/h Model)
Trouble 1
Turn off the main power and wait until LED on outdoor PCB is off.
Turn on the main power again.
Does "Beeping" sound is made from the indoor unit?
Does "Lighting" LED is mounted on the outdoor PCB?
NO
YES
• Primarily, the operating condi-
tion of Micom is O.K.
Check the voltage of power(AC 208~230V, 60Hz).
• The voltage of main power.
• The voltage applied to the unit.
• The connecting method of Indoor/Outdoor connecting cable (each color)
• The P.W.B. Ass'y
(Fuse,Noise Filter, Power Module(SMPS), IC01D,IC04D)
• Check CN-DISP1
The operation check of the P.C.B. Ass'y
Specification
: DC 220V~390V
Remedy
Procedure
1) The input voltage of Power
Module(SMPS)
Replace the P.C.B.
2) The output voltage of Power
Module (SMPS)
: 15V 10%
: DC 5V
3) IC01D(LD1085), IC04D(7805)
Service Manual 41
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Part 4 Trouble Shooting
Product doesn't operate with the remote controller. (9~30kBtu/h Model)
Trouble 2
Turn on main power.
While the compressor has been stopped, the compressor does not operate
owing to the delaying function for 2 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, 2 connector
screen, replace battery.
Check DISP P.C.B Ass'y
-Voltage between CN-DISP1
-
: DC +5V
Check point
• Check the connecting circuit between
MICOM PIN and CN-DISP1 PIN
• Check receiver ass'y
42 Room Air Conditioner
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Part 4 Trouble Shooting
The Compressor/Outdoor Fan don't operate (9~30kBtu/h Model)
Trouble 3
Turn on the main power.
Operate Cooling Mode by setting the disired temperature of the remote controller is less
than one of the Indoor temperature by 1°C at least.
When in air circulation mode, compressor/outdoor fan is stopped.
Check the sensor for Indoor temperature is attatched as close as to be effected by the
themperature of Heat Exchange (EVA.)
When displaying Error code, refer to the trouble shooting guide.
Check the main power source.(AC 208V~230V)
Check the trouble shooting guide error code 6,9
Turn off main power.
Check the electrical wiring diagram of Outdoor side.
Check the open or short of connecting wires between Indoor and Outdoor.
Service Manual 43
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Part 4 Trouble Shooting
The Compressor/Outdoor Fan don't operate (18, 24, 30kBtu/h Model)
Trouble 4
Turn on the main power.
Operate Cooling Mode by setting the disired temperature of the remote controller is less
than one of the Indoor temperature by 1°C at least.
When in air circulation mode, compressor/outdoor fan is stopped.
Check the sensor for Indoor temperature is attatched as close as to be effected by the
themperature of Heat Exchange (EVA.)
When displaying Error code, refer to the trouble shooting guide.
Check the main power source.(AC 208V~230V)
Check the trouble shooting guide error code 21,26.
Check that CN_FAN(A,B) supplied voltage to outdoor PCB is about AC 208V~230V.
Turn off main power.
Check the electrical wiring diagram of Outdoor side.
Check the open or short of connecting wires between Indoor and Outdoor.
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Part 4 Trouble Shooting
When indoor Fan does not operate.(9~30kBtu/h Model)
Trouble 5
Turn off main power.
Check the connection of CN-FAN.
Check the Fan Motor.
Check the Fuse(AC250V, T2A).
Check the related circuit of indoor Fan Motor.
• The pin No. 38 of micom and the part for driving SSR.(Q01M)
• Check the related 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 the main power
Check the SSR high speed operation by remote control.
(the Indoor Fan Motor is connected)
The voltage of Pin No 1(orange) and 3(black) of CN-FAN.
About AC 160V over
SSR is not damaged
About AC 50V over
Check SSR
Service Manual 45
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Part 4 Trouble Shooting
7. Self-diagnosis Function
I 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.
I 9, 12kBtu/h Model
Indoor
Operation
Display
Indoor Outdoor
Error
Code
Cause of Error
Error Indicator
1 time
3 sec
1time
3 sec
2times
3 sec
4times
1time
1time
3 sec
1time
• Indoor Temp. sensor error
- Sensor open or short
O
1
2
ON
ON
3 sec
2times
2times
3 sec
2times
3 sec
• Outdoor Temp. sensor error
- Sensor open or short
O
O
O
O
O
O
O
O
4times
3 sec
5times
3 sec
• Heat Sink sensor error
- Sensor open or short
- Heat Sink temp is over 9°…5
ON
4
5
6
3 sec
5times
3 sec
• Communication error
OFF
6times
3 sec
6times
SHUT
DOWN
• DC Peak error
7times
8times
9times
7times
3 sec
SHUT
DOWN
O
O
O
O
• Over current error (CT2)
7
8
8times
3 sec
• Indoor fan lock error
(BLDC fan model only)
OFF
OFF
9times
3 sec
• Outdoor fan lock error
(BLDC fan model only)
O
O
9
10times 10times
3 sec
• D-Pipe TH. is short or open.
O
ON
10
(4 LED Model)
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Part 4 Trouble Shooting
I 18,24,30kBtu/h Model
Indoor Error
LED1
(Red)
LED2
(Green)
Indoor
Status
ON
Error code
Descrition
INV TPS
00
01
02
03
04
05
06
07
No Error
Indoor Room themistor error
Indoor in-piping sensor error
Remote controler error
1time
2times
3times
4times
5times
6times
times
OFF
OFF
OFF
OFF
OFF
OFF
OFF
Drain Pump error
Communcation error between in and out
Indoor Out-Piping sensor error
Diffrent mode operation
Outdoor Error
Ex) Error Code 21 (IPM Fault)
2 Times
2 Times
1 Sec.
2 Times
1 Sec.
LED01G
(RED)
1 Sec.
1 Time
1 Time
1 Time
LED02G
(GREEN)
2 Sec.
2 Sec.
LED02G
(Green)
Outdoor
Status
Error
code
LED01G
(Red)
Contents
Case of error
21
IPM Fault (Compressor Over current)
CT 2(Max. Current)
2 times
2 times
2 times
2 times
2 times
2 times
2 times
2 times
3 times
3 times
1 time
Compressor malfunction,IPM Fault
Current is 14A
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
22
2 times
3 times
4 times
5 times
6 times
7 times
8 times
2 times
3 times
23
DC Link Low Volt.
DC Link volt. Is 140V
24
Low / High press
Low / High press switch OPEN
Abnormal AC volt. Input.
25
AC Low / AC High Volt.
DC Compressor Position
PSC Fault
26
27
28
DC Link High Volt
Off
Off
Off
32
Discharge Pipe Temp. High (INV)
Discharge Pipe Temp. High (Cons.)
33
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Part 4 Trouble Shooting
LED02G
(Green)
Outdoor
Status
Error
code
LED01G
(Red)
Contents
Case of error
40
CT Circuit (open/ short)
4 times
4 times
4 times
4 times
4 times
4 times
5 times
5 times
6 times
6 times
6 times
6 times
CT Circuit malfunction
Open / Short
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
41
D-pipe sensor INV. (open/ short)
Air sensor (open/ short)
1 time
44
4 times
5 times
6 times
7 times
1 time
Open / Short
45
Cond. Pipe sensor (open/ short)
Suction pipe sensor (open/ short)
D-pipe sensor Cons. (open/ short)
Over capacity
Open / Short
46
Open / Short
47
Open / Short
51
Over load combination
Communication Poorly
Check sum mismatching
Cond. Temp. high
Heat sink temp. high
Open / Short
53
Communication (Indoor Outdoor)
EEPROM check sum
3 times
60
61
Cond. Pipe sensor temp. high
Heat sink sensor temp. high
Heat sink sensor (open/ short)
1 time
62
2 times
5 times
65
48 Room Air Conditioner
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Part 4 Trouble Shooting
I Troubleshooting Guide(9,12kBtu/h Model)
Error code
Description
Cause of error
• Indoor TH. (sensor) is short or open
Indoor TH. is short or
open
• Indoor TH. (sensor) is not connected to the indoorpcb assembly
• Damage or defect on the sensing circuit of indoorpcb assembly.
(R01H, R02H, R03H, R04H, C01H, C02H)
1
Check flow
YES
YES
Indoor TH. is connected to
Indoor pcb assembly ?
Sensing circuit of indoor
pcb is right ?
Indoor TH. is right ?
No
No
No
Check Indoor TH.
- Connect to CN-TH1 in
indoor pcb assembly
- Measure resistance of TH.
(air : about 10kΩ at 25°C(77°F),
pipe : about 5kΩ at 25°C(77°F)
- Check soldering state of
R01H ~ R04H, C01H, C02H
Error code
Description
Cause of error
• Outdoor TH. (sensor) is short or open
Outdoor TH. is short or
open
• Outdoor TH. (sensor) is not connected to the outdoorpcb assembly
• Damage or defect on the sensing circuit of outdoorpcb assembly.
(R03H~R06H, C02H, C03H)
2
Check flow
YES
YES
Outdoor TH. is connected to
outdoor pcb assembly ?
Sensing circuit of outdoor
Outdoor TH. is right ?
pcb is right ?
No
No
No
Check outdoor TH.
- Connect to CN-TH1 in
outdoor pcb assembly
- Measure resistance of TH.
- Check soldering state of
R03H ~ R06H, C02H, C03H
(air : about 10kΩ at 25°C(77°F),
pipe : about 5kΩ at 25°C(77°F)
Service Manual 49
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Part 4 Trouble Shooting
Error code
Description
Cause of error
• Heat-sink TH. is damaged(short or open).
Heat-sink Temp. is over
95°C(203°F)
Heat-sink TH.
is open or short
• Heat-sink Temp. is over 95°C(203°F)
4
• Damage or defect on the sensing circuit of outdoorpcb assembly.
(R01H, R02H, C01H)
Check flow
YES
YES
Heat-sink TH is connected to
outdoor PCB assembly?
Heat-sink TH. in INV-IC is
Right ?
Sensing circuit of outdoor
pcb is right ?
No
No
No
Check heat-sink TH.
- Measure resistance of TH.
(about 10kΩ at 25°C(77°F))
- Check soldering state of
R01H, R02H, C01H
- Connect to CN-TH2 in
outdoor PCB assembly
50 Room Air Conditioner
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Part 4 Trouble Shooting
Cause of error
Error code
Description
• Wrong or missing wiring between indoor and outdoor unit cable
• Defect of communication components in indoorpcb assembly
• Defect of communication components in outdoorpcb assembly
• Defect of power supply components in outdoorpcb assembly
• No ground connection in air conditioner unit
Communication Error
5
(affected by noise in power source)
Check flow
YES
YES
Is the voltage of T/Block
in outdoor about
AC 208~230V ?
Wiring connection
Is right ?
Is the voltage of GND & DC5V in
Outdoor pcb about DC 5V ?
,
No
No
No
Indoor
1(BR)
2(BL)
Outdoor
1(BR)
2(BL)
Check power connector
Is not connected to the
T/Block in indoor unit.
Check FUSE, NF01/02J, PTC,
Power Module, BD-01S in
Outdoor pcb assembly
3(GN/YL) 3(GN/YL)
4(RD)
4(RD)
YES
YES
Communication circuit of indoor
& outdoor pcb Is right ?
Ground connection is installed ?
(power outlet or outdoor chassis)
No
No
Earth port
Check IC01K, IC02K,D01K~D03K,
ZD01K~ZD03K, R01K~R10K,
C01K~C04K
Install ground connection from outdoor
unit. (In case power outlet has no earth
port)
Service Manual 51
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Part 4 Trouble Shooting
Error code
Description
Cause of error
• Supplied power is not normal
•
Comp Connector (CN-U,V,W) is disconnected or inserted to wrong
position
DC Peak Error
6
• Compressor is damaged (coil short) ➔ replace compressor
• Too much Refrigerant
• Defect in outdoor pcb assembly ➔ replace pcb assembly
Check flow
YES
YES
Supplied voltage to
Outdoor pcb is about
AC 208~230V ?
Is connector (CN-U,V,W)
connected to compressor and
inserted to pcb in right position ?
Refrigerant pressure is right ?
No
No
No
Check CN-U,V,W connector
(U : RD, V : BL, W : YL)
Check refrigerant pressure
and adjust.
Check power source
YES
YES
Inverter components in outdoor pcb assembly are
right ?
Is the compressor right ?
No
No
Check resistance
* 9 K/12K Model
Between U-V, V-W, U-W port.
¡Short / Open circuit
(Comp.motor coil error)
¡normal : 1 ~2Ω
Between U,V,W and Body
¡normal : over 10MΩ
Check
Short of SPM3 pins (GND - P, U, V, W pin)
Direction of D01Z~D03Z, C08Z,10Z,12Z,16Z
Assembling state of R01P ~ R21P & IC01P
Assembling state of screw between INV-IC &
Heat-sink
DC 15V output of Power module.
U
Ω
W
V
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Part 4 Trouble Shooting
Cause of error
Error code
Description
• Supplied power is not normal
• Indoor/outdoor fan is locked
• Too much refrigerant
• Defect in current sensing circuit in outdoor pcb assembly
Over current Error
(CT2)
7
Check flow
YES
YES
Supplied voltage to
Outdoor pcb is about
AC 208~230V ?
Does indoor / outdoor fan work
normally ?
Refrigerant pressure is right ?
No
No
No
Check indoor / outdoor fan and
adjust.
Check refrigerant pressure
and adjust.
Check power source
YES
Current sensing circuit is right ?
No
Check current sensing circuit.
- check CT is damaged in outdoor pcb
(output wire is disconnected to pin or not)
- BD01N is inserted in right position
(refer marking on pcb and component)
- Spec of R01N (1kΩ), R02N (1.65kΩ) is correct
- Direction of diode (D01N, D02N) is right
Service Manual 53
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Part 4 Trouble Shooting
Error code
Description
Cause of error
• Indoor fan is locked or separated
• Fan connector is not connected to indoor pcb assembly
• Defective in DC-fan driving circuit
Indoor fan is locked
8
(BLDC fan model only)
Check flow
YES
YES
Indoor fan is rotating ? (1)
No
Indoor fan is rotating ? (2)
DC–fan driving circuit is right ?
No
No
Check indoor unit
- remove obstacles in
indoor unit
Check DC Fan Driving circuit
(Soldering state & Direction)
- R01F~R09F, C01F~C03F,
IC01F~IC03F, Q01F~Q02F, ZD01F
Check soldering state of
CN-Motor1 & assembling
state of DC Fan connector
- fan assembled correctly.
Error code
Description
Cause of error
• Outdoor fan is locked by an obstacle (ex : branch of tree, bar…etc)
• Fan connector is not connected to outdoor pcb assembly
• Defective in DC-fan driving circuit
Outdoor fan is locked
(BLDC fan model only)
9
Check flow
YES
YES
Outdoor fan is rotating ? (1)
No
Outdoor fan is rotating ? (2)
No
DC–fan driving circuit is right ?
No
Check DC Fan driving circuit
(Soldering state & Direction)
- R01F~R05F, C01F~C03F,
Q01F~Q04F, ZD01F
Check outdoor unit
- remove obstacles in
outdoor unit
Check connector is not
connected to outdoor pcb
assembly (CN-FAN2)
54 Room Air Conditioner
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Part 4 Trouble Shooting
Cause of error
Error code
Description
• D_pipe TH. is short or open
• D_pipe TH. is not connected to the outdoor pcb assembly
• Damage or defect on the sensing circuit of outdoor pcb assembly
D-Pipe TH. is short or
open
10
Check flow
YES
YES
D_PIPE TH. is connected to
Outdoor pcb assembly ?
Sensing circuit of outdoor
D_PIPE TH. is right ?
pcb is right ?
No
No
No
Check D_PIPE TH.
- Measure resistance of TH.
(about 200kΩ at 25°C(77°F)).
Connect to CN-D_PIPE
in outdoor pcb assembly
- Check soldering state of
R07H, R08H, C04H
Service Manual 55
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Part 4 Trouble Shooting
I Troubleshooting Guide(18,24,30kBtu/h Model)
1) Troubleshooting CH01, CH02, CH06
Error
code
Title
Cause of error
• Open / Short
• Soldered poorly
• Internal circuit error
Check point & Normal condition
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.
56 Room Air Conditioner
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Part 4 Trouble Shooting
2) Troubleshooting CH05, CH53
Error
Title
Cause of error
Check point & Normal condition
code
• Power input AC 208~230V. (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
/
53
Communication
(Indoor ¡ Outdoor)
• Communication poorly
Check Point
1. Check the input power AC 208~230V. (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 out-
door unit.
Service Manual 57
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Part 4 Trouble Shooting
3) Troubleshooting CH21
Error
Title
Cause of error
Check point & Normal condition
code
• An instant over current in the U,V,W phase
- Comp lock
- The abnormal connection of U,V,W
• Over load condition
- Overcharging of refrigerant
- Pipe length.
• Instant over current
• Over Rated current
• Poor insulation of IPM
21
DC Peak
• Poor insulation of compressor
Comp
Resistance(Ω) at 20°C(68°F)
U
Constant
comp.
Inverter
comp.
Terminal
Ω
U-V
V-W
W-U
0.64
0.64
0.64
0.8
0.8
0.8
V
W
Copper
pipe
Comp
Resistance(Ω) at 20°C(68°F)
Constant
comp.
Inverter
comp.
Terminal
Ω
U-GND
V-GND
W-GND
2MΩ
2MΩ
2MΩ
2MΩ
2MΩ
2MΩ
Check Point
1. Check the wire connection. (U,V,W)
2. Check the load condition. (Refrigerant, Pipe length, …) ¡ Adjust the load condition
3. Check the electricity leakage of the compressor. ¡ Normal : Over 2MΩ.
4. Check the resistance of compressor. ¡ Normal : 0.65Ω(INV), 0.8Ω(Cons.) ¡ No difference at each terminal.
5. Check the insulation from water at IPM part. ¡ Check the trace of water.
6. Check the IPM circuit.
58 Room Air Conditioner
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Part 4 Trouble Shooting
4) Troubleshooting CH21, CH22
Error
Title
Cause of error
Check point & Normal condition
code
Malfunction of compressor
Blocking of pipe
Low voltage input
21
Max. C/T
Over current (14A
)
Refrigerant, pipe length, blocked, …
Malfunction of current detection circuit.
(Open / Short)
The voltage of “C01N” is 4.0VDC(25A)
C/T
Internal circuit
Initial current error
22
.
V
-
+
Check Point
1. Check the power source.
+ -
+ -
2. Check the fan operation is right.
3. Check the current.
4. Check the install condition.
5. Check the internal circuit. (C/T, Diode, Resistor)
Service Manual 59
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Part 4 Trouble Shooting
5) Troubleshooting CH23, CH28
Error
Title
Cause of error
Check point & Normal condition
code
DC Link
Low voltage.
• Check the power source.
• Check the components.
• DC link volt. is
23
140VDC
.
DC Link
High voltage
• DC link volt. is
• Check the power source.
• Check the components.
28
420VDC
.
Check Point
1. Check the power source.
2. Check the components
(B/Diode, Reactor, PSC Parts )
V
60 Room Air Conditioner
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Part 4 Trouble Shooting
6) Troubleshooting CH24, CH25
Error
Title
Cause of error
Check point & Normal condition
code
• Check the connection of “CN_Press”.
• Check the components.
• Low / High press
S/W open.
24
Press S/W Open
Input voltage
•
Abnormal Input voltage
(140VAC , 300VAC ).
• Check the power source.
• Check the components.
25
TRANS1
50Hz, DC12V
CN PRESS
CN TRNAS1
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.
Service Manual 61
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Part 4 Trouble Shooting
7) Troubleshooting CH26, CH27
Error
Title
Cause of error
position detect error
• Over current at “IGBT”
Check point & Normal condition
code
• Check the connection of comp wire “U,V,W”
• Malfunction of compressor
• Check the component of “IPM”, detection parts.
DC Compressor
• Compressor
26
Position
• Check the component of “IGBT” .
• Check the components.
PSC Fault
27
E
C
B
C
E
B
Check Point
• CH 26
• CH 27
1. Check the component of “IGBT”
1. Check the connection of “U,V,W”
2. Check the insulation of IPM part.
3. Check the compressor. (same with CH21)
2. Check the components
(IGBT, R04S, NF1, BD02S)
62 Room Air Conditioner
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Part 4 Trouble Shooting
8) Troubleshooting CH32, CH33, CH40
Error
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
40
(105°C(221°F)
)
• Open/Short
• Soldered poorly
• Internal circuit error
CT Sensor
• Normal resistor : about 0
Ω
D-Pipe temp.
Toff(105) °C
(221) °F
T2(95) °C
(203) °C
T1(90) °C
(194) °C
COMP Frequency
Normal
Normal
Normal
Normal
OFF
(Hz)
LEV Openness
OFF Control
(Pulse)
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)
• CH 40
1. If the resistance of the sensor is only
possible.
, the check Is
2 If the error occurs again after the reset , change the
PCB.
Service Manual 63
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Part 4 Trouble Shooting
9) Troubleshooting CH41, CH44, CH45, CH46, CH47, CH65
Display
code
Title
Cause of error
• Open / Short
• Soldered poorly
• Internal circuit error
Check point & Normal condition
• 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)
Condenser Pipe sensor
Suction Pipe sensor
D-pipe sensor (Constant)
Heat sink sensor
• Normal voltage : 2.5VDC / at 25°C(77°F) (plugged)
• 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
64 Room Air Conditioner
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Part 4 Trouble Shooting
10) Troubleshooting CH51, CH60
Display
Title
Cause of error
Check point & Normal condition
code
• Check the indoor unit capacity.
• Check the combination table.
• Over capacity
Combination
51
Over capacity
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 65
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Part 4 Trouble Shooting
11) 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.
66 Room Air Conditioner
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AUGUST, 2007
P/NO : MFL41161601
Download from Www.Somanuals.com. All Manuals Search And Download.
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