HEAT CONTROLLER, INC.
Wall Mounted
Mini-Split System
Single-Zone
Air Conditioning/Heat Pump
Service Manual(General)
VMC09SB-1/VMH09SB-1
VMC12SB-1/VMH12SB-1
VMC18SB-1/VMH18SB-1
VMC24SB-1/VMH24SB-1
VMC30SB-1/VMH30SB-1
Before servicing the unit, read the
“safety precautions” in this manual.
Only for authorized service personnel.
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Part 1 General Information
1. Safety Precautions ............................................................................................................4
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Part 1 General Information
1. Safety Precautions
To prevent injury to the user 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 property 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 can cause frostbite.
Release the refrigerant gas completely in 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, ventilate the area. If the refrigerant
gas comes in contact with fire, a poisonous gas poisonous gas generates.
Leakage of the refrigerant closed room full of gas is dangerous because a short-
age of oxygen occurs. Be sure to ventilate the area.
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. 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 ground/earth conductor connected
to the ground/earth terminal.
Conduct repair work after checking that the refrigerating cycle section has
cooled down sufficiently. Otherwise, hot refrigerant in cycle can cause burns.
Do not tilt the unit while removing panels. Otherwise, the water inside the unit
can spill and wet floor.
Weld in a well-ventilated place. Welding 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.
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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 ground/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 (ground/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 2 Functions & Controls
1. List of Controls & Functions ..........................................................................................8
2. Basic Mode Controls........................................................................................................9
3. Special Mode Controls...................................................................................................11
4. Utility Functions .............................................................................................................12
5. Protection Functions & Controls .................................................................................15
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Part 2 Functions & Controls
1. List of Functions & Controls
Category
Function
Description
Remark
Cooling Mode
Heating Mode
Healthy Dehumidification
Auto Changeover
Cooling operation
Heating operation
Dry operation
Cooling mode is automatically changed to heating mode and
vice versa
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 cold air from blowing on heating mode start
up until the evaporator coil has warmed up.
Freeze prevention
Evaporator frost prevention
Compressor Pre Heating
Sump Heater Control
Automatic Defrost
Power Relay Control
Inverter (with inverter
power control)
To protect compressor
To protect fan from accumulated ice at base panel
Condenser frost prevention
Over current prevention
Modulation of voltage & frequency to allow the compressor to
run at various speeds.
9,12k Model Only
Protection
Controls &
Functions
Overheating Protection
(Power Module)
Total Current Control
(Over Current Protection)
DC Peak Control
To protect power module
To protect power device
To protect power module
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
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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 Heatpump Only
Thermo OFF
Thermo ON
5˚C(9˚F)
2˚C(3.6˚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 +5°C(9°F) above the setting temperature.
• Condition of compressor turned on
- When intake air temperature reaches +2°C(3.6°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.
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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 lower frequency and
the indoor fan speed again operates at low speed or comes to a stop.
2.4 Auto changeover operation Heatpump Only
• 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
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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 horizontal vane of the unit is reset to the initial cooling vane position and then
operates so that the air outflow can reach further.
3.2 Jet Heat operation Heatpump Only
• 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 horizontal vane of the unit is reset to the initial Jet heating vane position and
then operates so that the air outflow can reach further.
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, the set temperature and air volume is set automatically to save energy.
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Part 2 Functions & Controls
4. Utility Functions
4.1 Forced operation
• To operate the appliance manually if the remote control is lost. The forced operation selection switch is on the main
unit of the appliance and will operate the appliance in the standard conditions.
• The operating condition is set according to the outdoor temp. and intake air temperature as follows.
Heat pump Model
Cooling Model
Room Temp. ≥ 24°C(75.2°F) 21°C(69.8°F) ≤ Room Temp. < 24°C(75.2°F) Room Temp. < 21°C(69.8°F)
Operating mode
Indoor FAN Speed
Setting Temperature
Cooling
High
Cooling
High
Healthy Dehumidification
High
Heating
High
22°C(71.6°F)
22°C(71.6°F)
23°C(73.4°F)
24°C(75.2°F)
• The unit will automatically select the last operation mode it last operated in within the past 3 hours based off of infor-
mation stored in the unit's memory.
• 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.
• Use after the cooling operation, before turning the unit off. This operation cleans and dries the evaporator based on
the cycle below, until the unit is operated again.
• The function is easy to operate as it is accessed through the Remote controller.
1) Heat/pump Model
2) Cooling/only Model
ON
OFF
ON
OFF
Cooling CYCLE
Fan Heating Fan
13 Min 60 Sec 120 Sec
Cooling CYCLE
Fan
30 Min
OFF
Comp.
ON
Comp.
ON
OFF
LL
ON
LL
OFF
LL
Indoor Fan
Setting Step
Low
Indoor Fan
Setting Step
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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, the high, medium, or low speed of
the airflow mode is operated for 2~15 sec. randomly by the Chaos
Simulation.
4.5 Chaos Swing
• By selecting Chaos swing, the horizontal vane automatically operates with a swinging motion or it is fixed to the
desired direction.
4.6 Sleep mode Auto control
• Using the remote control, the sleep mode timer can be set for a time period of 1,2,3,4,5,6 or 7 hours. During this time
period the unit will operate as described in sections 4.6.1 or 4.6.2, until the set time period has expired. Once the set
time period has been reached, the unit will automatically turn off.
• 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°F).
After another 30minutes lapse, it increases again by 1°C(2°F).
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
NOTE: Some Models are different by swing width and swing pattern.
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Part 2 Functions & Controls
4.6.2 Sleep timer operation for heating cycle Heatpump Only
• While in heating mode, 60 min. after the start of the sleep timer, the setting temperature decreases by 1°C(2°F).
After another 60minutes lapse, it decreases again by 1°C(2°F).
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
in the memory of the appliance appliance. Upon restoring power, The unit will return back to it's last operation mode
automatically based on the information saved in the appliance's memory, as shown below.
• 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
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Part 2 Functions & Controls
5. Protection Functions & Controls
5.1 Five Seconds Stand-by (fan)
• The indoor unit fan will begin to rotate after 5 seconds of the unit being turned on.
5.2 Two Minutes Stand-by (comp.)
• After the compressor cycles off, it will not restart for a minimum of 2 minutes.
5.3 Hot start Heatpump Only
• To prevent cold air from blowing in the room upon starting up the unit in heating mode, the indoor fan will not rotate
until the heat exchanger temperature reaches 30˚C(86˚F).
5.4 Freeze prevention (Protection of the evaporator pipe from frosting)
Heatpump Only
• If the indoor pipe temperature is below 0˚C(32˚F) within 7 minutes after the compressor operates continuously in cool-
ing mode, the compressor and outdoor fan will turn off.
• When the indoor pipe temperature is 7˚C (44.6˚F) or higher after a 2 minute pause/cycle off of the compressor, the
compressor and outdoor fan will turn on according to the condition of the indoor air 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 Compressor Preheating Heatpump Only
5.5.1 9,12kBtu/h Model
With low outdoor temperature, preheating the compressor compressor is neccessary to maintain the oil viscosi-
ty before the unit starts.
The preheating Mode preheats the compressor motor coil/windings by electric current without compressor run-
ning.
Mode-in conditions : Outdoor temp. < 0˚C (32˚F) and Discharge pipe temp < 15˚C (59˚F)
Mode-out conditions : Outdoor temp. > 5˚C (41˚F) or Discharge pipe temp < 25˚C (77˚F) or Compressor on
5.5.2 18, 24, 30kBtu/h Model
When the unit starts with low outdoor temperature, preheating the compressor is neccessary to maintain the oil
viscosity.
upper case Under the following conditions, the compressor runs at 15Hz for a specific time
Conditions : heat sink temperature < 0˚C (32˚F) and Discharge pipe temp < 0˚C (32˚F)
Outdoor Temperature
Running Time [sec]
-5˚C (23˚F) ~ -0˚C(32˚F)
-10˚C (14˚F) ~ -5˚C (23˚F)
Under -10˚C (14˚F)
90
180
300
5.6 Sump Heater Control (9, 12kBtu/h Model Only) Heatpump Only
With low outdoor temperature, the sump heater located on base panel prevents icing that may cause drain
blockage and fan damage.
Heater-on conditions : Outdoor temp. ≤ 0˚C (32˚F) and heating mode
Heater-out conditions : Outdoor temp. > 1˚C (34˚F)
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Part 2 Functions & Controls
5.5 Automatic defrost Heatpump Only
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,
the unit is reversed to the cooling cycle to defrost the evaporator pipe of the outdoor unit.
• Defrost control is available 40 minutes after the heating cycle started and the difference of the pipe
tem-perature of outdoor unit reaches above option 1.
• The defrost 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
Step 3
Min
Min
(Comp off
Inapplicable.)
off
Operating
Freq. Of
Comp
Setting Freq.
15sec
Step 5
Step 3
(Comp off
Applicable.)
Min
Min
off
off
The Degree
of Superheat
Control
300
Starting Step
ON
EEV
Open step
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
Model (kBtu/h)
Compressor Frequency
65Hz(Step 5)
EEV
9
300
300
12
80Hz(Step 5)
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Part 2 Functions & Controls
5.5.2 18,24,30kBtu/h Model
• Starting the defrosting operation
1) Defrost operation will start when the conditions below are met:
a) Accumulation time of operation and the period after completion of defrost = 35 min.
b) After 10 minutes from re-starting the compressor and over 35 minutes of accumulated operating time,
defrosting operation starts after 10 minutes.
c) Piping temperature of the outdoor heat exchanger is maintained below the defrost starting temperature for 4
minutes after 35 minutes continuous operation.
d) Exceeding 10 minutes after oil recovery operation
2) Outdoor piping temperature is below –6°C (21.2°F, Option) for starting defrosting operation.
Defrosting
Comp. Freqency
Model (kBtu/h)
Defrosting Comp. Frequency
EEV
350
350
350
18
24
30
90Hz
77Hz
90Hz
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Part 2 Functions & Controls
• Defrosting Control Algorithm
1) Lowering the compressor frequency starts the defrosting operation.
Constant speed compressor is ON 10 seconds.
2) The EEV has an opening 350 pulse (Option) when starting the defrosting operation.
3) Reversing valve is OFF after 5 seconds from the compressor reaching an operating frequency of 30 Hz.
Then the indoor fan turns OFF (including when the indoor unit is OFF, except if the remote controller is OFF).
4) After 5 seconds from the compressor reaching 30Hz, the outdoor unit fan turns off and the Hot gas Bypass/Oil
Separator valve turns OFF.
NOTE: Comp.frequency and EEV pulse is different for each models.
• Control algorithm of defrost completion
1) Frequency of compressor lowers to 30 Hz and maintains constant speed operation at 30 Hz for 75 seconds and
then starts operating. If the constant speed compressor is OFF, it will receive an off receive OFF signal after 5
seconds from the compressor reaching 30 Hz.
2) The EEV will open with the standard previous pulse after 5 seconds from the time the compressor reaches 30
Hz.
3) Reversing valve is ON after 15 seconds from the time the compressor reaches 30 Hz.
4) The indoor unit fan is ON with high speed for 5 seconds from the time the compressor reaches 30Hz.
5) Hot Gas bypass valve/Oil separator bypass valve is OFF after 75 seconds from the time the compressor reach-
es 30Hz.
NOTE: Comp.frequency and EEV pulse is different for each models.
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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 a 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.)
• The LED on PCB board 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
T1 = T on + ∆T
Heat Sink Temp.
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)
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Part 2 Functions & Controls
5.8.2 18,24,30kBtu/h Model
• Function
: Power module failure is protected by checking the temperature of heat sink via a temperature sensor.
• 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
The system will stop if this situation occurs 5 times within 1 hour an which error Code4 will be generated and
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 reaches Toff condition, the system will count the occurrence 5 times, then the system will
stop with error code 4.
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
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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 CT1, the operating frequency of the compressor decreases.
• After decreasing the operating frequency by 4Hz, if operating current is below I1 for 60 seconds continuously, the
operating frequency of compressor increases to setting frequency.
2) CT2 control
• If the operating current of the appliance reaches CT2, the compressor stops instantly and two minutes later the com-
pressor restarts again.
• If CT2 occurs 5 times within one hour, the appliance turns off and displays ERROR CODE 7.
Model
(kBtu/h)
CT 1
(Cooling)
CT 1
(Heating)
CT 2
9
7.5A
7.5A
9A
9A
10A
10A
12
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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 the value of CT1, then the operating frequency will be reduced by 1 step.
- Step down 10Hz from current step.
- If new Hz is below the minimum frequency 15Hz, then turn off the compressor.
b) After step down,if the total current exceeds CT1 for more than 5 sec. then the compressor will 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, the compressor will turn off.
after 3 min the compressor and check the current again.
b) If the CT2 condition occurs 5 times within 1 hour, then the unit will stop operating and Error Code 22 will be
displayed.
Model
(kBtu/h)
CT 1
(Cooling)
CT 1
(Heating)
CT 2
18
24
30
11A
14A
11A
12A
12A
12A
14A
15.5A
14A
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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 is below DC 140V and this 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 thermistor 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's operating frequency is limited according to the compressor dome thermistor. (Refer to below Fig.)
• Temperature range of COMP SPEC varies by 10°C(50°F).
∆T = (T off - T2)/2
Discharge 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)
T2 : 100°C(212°F)
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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) Temperature 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
expansion 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.
Discharge 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
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Part 2 Functions & Controls
5.11.3 Constant Compressor (only 30kBtu/h Model)
1) There can be two situations
(a) Temperature 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 10 pulses 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
Discharge 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
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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 a certain temperature, liquid return is prevented by On/Off control of outdoor fan.
• It can prevent frosting of evaporator and keep cooling operation
Model
Mode-in Condition
Mode-out Condition
Outdoor fan-off time ≥ 5 min.
(Or) Outdoor pipe temp. ≤ 20˚C(68˚F)
(And) Outdoor temp. ≥ 10˚C (50˚F)
Outdoor fan-on time ≥ 3 min.
(And) Outdoor pipe temp. ≤ 4˚C (39˚F)
(And) Outdoor temp. < 10˚C (50˚F)
Mode-in by outdoor
pipe temp.
Comp-on time ≥ 5 min.
(And) Indoor pipe temp. ≤ 4˚C (39˚F)
(And) Outdoor temp. < 10˚C (50˚F)
Outdoor fan-off time ≥ 5 min.
(Or) Indoor pipe temp.≤ 4˚C (39˚F)
(And) Outdoor temp. ≥ 10˚C (50˚F)
Mode-in by indoor
pipe temp.
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, the compressor will run for 5 min & then it will go into
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 conditioned con-
trol.
Outdoor pipe temp
(T2 = 0)°C
(T1 = 0)°C
O/D fan
Off
Off
Set speed
Set speed
Set speed
Model
T1 [˚C(˚F)]
T2 [˚C(˚F)]
18kBtu/h
24kBtu/h
30kBtu/h
18(64)
16(61)
0(32)
18
16
0
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Part 2 Functions & Controls
5.13 Oil return control(30kBtu/h Model) Heatpump Only
5.13.1 Operating Contion
1) When the continuous running time is over 3hr.(option), oil returning operation is run for 3min.
In case of the initial operation, oil returning operation is run, after completing initial operation.
2) After defrost and oil returning operation, the continuous running time is reset.
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 begins.
2) If compressor operating Hz is below 40 Hz by the safety control, the accumulated time will be cleared and oil
restoration does not begin.
3) During this operation,if operating Hz can not be changed by safety control, the oil equalization operation will
cease.
Operating process : Raise the operating HZ up to 70,and after 20 sec.(option) recover to the last value.
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Part 3 Test Run
Part 3 Test Run
1. Check before Test Run...................................................................................................31
2. Test Run Flow chart .......................................................................................................32
3. Test Run Detail................................................................................................................33
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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 meter shows 2.0 MΩ or more between power supply terminal block and ground.
Do not operate when there is 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 may decrease 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.
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Part 3 Test Run
2. Test Run Flow chart
START
Test operation for indoor unit
No
No
Refer to part4, Section 7: Electronic
Troubleshooting Guide
Operate the unit in cooling mode.
Does Test operation start?
Yes
Is cold air discharged for
more than 3 minutes ?
Refer to part4, Section 5: Cycle
Troubleshooting Guide
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 in heating
mode during the test run procedure.
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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 pressures 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 Ø0.39 inch
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 possibilities.
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.
• When vibration of the unit is conveyed through the hose,
secure the unit with an anti-vibration bushing.
CAUTION:
Be sure to perform Pump Down procedure with the unit in
cooling mode.
Bolt
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.
6. Change from cooling mode to heating mode (if heat
pump model) and check all operations.
Intake temperature
Discharge air
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.)
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Part 4 Trouble Shooting
1. 2-Way, 3-Way Valve ........................................................................................................35
2. Pumping Down ..............................................................................................................36
3. Evacuation ......................................................................................................................37
4. Gas Charging (After Evacuation) .................................................................................38
5. Cycle Troubleshooting Guide........................................................................................39
6. Electronic Parts Troubleshooting Guide......................................................................40
7. Self-diagnosis Function.................................................................................................45
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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
operating device
Standard position
Air purging
Shaft position
Shaft position
Service port
Closed
(with valve cap)
Closed
(with valve cap)
Closed
(with cap)
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)
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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
cycle and stop it when the gauge indicates
1kg/cm2·g (14 PSI).
(1) Confirm that both the 2-way and 3-way valves
are set to the open position.
– Remove the valve stem caps and confirm that
the valve stems are in the raised position.
– Be sure to use a hexagonal wrench to operate
the valve stems.
(7) Immediately set the 3-way valve to the closed
position.
– Do this quickly so that the gauge ends up indi-
cating 3 to 5kg/cm2·g (42 to 71PSI).
(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
nut to a torque of 1.8 kg·m (13 lbf·ft)
– Be sure to check for gas leakage.
– Connect the charge hose with the push pin to
the service port.
(4) Air purging of the charge hose.
– Open the low-pressure valve on the charge set
slightly to allow 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
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 (2PSF).
(4) Disconnect the charge hose from the vacuum
pump.
– Vacuum pump oil.
If the vacuum pump oil becomes dirty or
depleted, replenish as needed.
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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.
– 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.
(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. The procedure is the same if
using a gas cylinder.
(3) Open the valve (Lo side on the charge set and
charge the system with liquid refrigerant.
– If the system can not be charged with the spec-
ified amount of refrigerant, it can be charged
with a little at a time (approximately 150g
(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 lbf·ft)
– Be sure to check for gas leakage.
(5.3oz) each time) while operating the air con-
ditioner in the cooling cycle; however, one time
is not sufficient, wait approximately 1 minute
and then repeat the procedure (pumping pin).
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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.
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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.
"Beeping" sound is from the indoor unit?
Flashing LED 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 PCB 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%
3) IC01D(LD1085), IC04D(7805)
: DC 5V
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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.
Wait 2 minutes for the compressor to turn on.
When the compressor is stopped stopped, the Indoor Fan is driven by a low speed.
At this point the air speed is not controlled by the remote controller.
(When operated in the Sleeping Mode, the air 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 ③ - ⑧ : DC +5V
Check point
• Check the connecting circuit between
MICOM PIN ( and CN-DISP1 PIN ⑦
• Check receiver ass'y
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Part 4 Trouble Shooting
The Compressor/Outdoor Fan does not operate (9, 12kBtu/h Model)
Trouble 3
Turn on the main power.
Using the remote controller, set the indoor set point to at least 15˚C(5˚F) less than the
indoor air temperature.
When in air circulation mode, compressor/outdoor fan is stopped.
Check that the sensor for Indoor temperature sensor is attatched and as close to the heat
exchanger (EVA.) as possible.
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.
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Part 4 Trouble Shooting
The Compressor/Outdoor Fan does not operate (18, 24, 30kBtu/h Model)
Trouble 4
Turn on the main power.
Using the remote controller, set the indoor set point to at least 15˚C(5˚F) less than the
indoor air temperature.
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 Q01M that drives the SSR.
• 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
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Part 4 Trouble Shooting
7. Self-diagnosis Function
I Error Indicator
• The error indicator assists with self-diagnoisis of the air conditioner and identifies if there is any trouble.
• The error indicator location is near the ON/OFF button by the LED on the evaporator and will signal as shown in
the table below.
• If more than two errors occur simultaneously, primarily the highest severity error code is displayed.
• After error an occurrence, the error is cleared, the error LED is also cleared, simultaneously.
• To operate again on the occurrence of error code, be sure to turn off the power and then turn on.
• The error codes are different for various models
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
• Heat Sink sensor error
- Sensor open or short
- Heat Sink temp is over 95˚C
(203˚F)
4times
3 sec
5times
3 sec
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
• Discharge pipe thermistor is
short or open.
O
ON
10
(4 LED Model)
- 45 -
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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
05
06
No Error
●
●
●
●
●
Indoor Room themistor error
1time ◑
2times ◑
5times ◑
6times ◑
OFF
OFF
OFF
OFF
Indoor in-piping sensor error
Communcation error between indoor and outdoor units
Indoor Out-Piping sensor error
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 or above.
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 or below.
Low / High press switch OPEN
Abnormal AC volt. Input.
24
Low / High press
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
- 46 -
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Part 4 Trouble Shooting
LED02G
(Green)
Outdoor
Status
Error
code
LED01G
(Red)
Contents
Case of error
40
41
44
45
46
47
53
60
61
62
65
CT Circuit (open/ short)
4 times
4 times
4 times
4 times
4 times
4 times
CT Circuit malfunction
Open / Short
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Off
Sensor INV. (open/ short)
Air sensor (open/ short)
1 time
4 times
5 times
6 times
7 times
3 times
Open / Short
Cond. Pipe sensor (open/ short)
Suction pipe sensor (open/ short)
Sensor Cons. (open/ short)
Open / Short
Open / Short
Open / Short
Communication (Indoor to Outdoor) 5 times
Communication Poorly
Check sum mismatching
Cond. Temp. high
Heat sink temp. high
Open / Short
EEPROM check sum
6 times
6 times
6 times
6 times
Cond. Pipe sensor temp. high
Heat sink sensor temp. high
Heat sink sensor (open/ short)
1 time
2 times
5 times
- 47 -
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Part 4 Trouble Shooting
I Troubleshooting Guide(9,12kBtu/h Model)
Error code
Description
Cause of error
• Indoor thermistor (sensor) is short or open
Indoor thermistor is short
or open
•
Indoor thermistor (sensor) is not connected to the indoor pcb assembly
1
• Damage or defect on the sensing circuit of indoorpcb assembly.
(R01H, R02H, R03H, R04H, C01H, C02H)
Check flow
YES
YES
Indoor thermistor is connected
to Indoor pcb assembly ?
Sensing circuit of indoor
Indoor thermistor is right ?
pcb is right ?
No
No
No
Check Indoor thermistor
- Connect to CN-TH1 in
indoor pcb assembly
-
Measure resistance of thermistor
(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 thermistor (sensor) is short or open
Outdoor thermistor (sensor) is not connected to the outdoor pcb assembly
• Damage or defect on the sensing circuit of outdoorpcb assembly.
Outdoor thermistor is
short or open
•
2
(R03H~R06H, C02H, C03H)
Check flow
YES
YES
Outdoor thermistor is connected
to outdoor pcb assembly ?
Sensing circuit of outdoor
pcb is right ?
Outdoor thermistor is right ?
No
No
No
Check outdoor thermistor
- Connect to CN-TH1 in
outdoor pcb assembly
-
Measure resistance of thermistor
- Check soldering state of
R03H ~ R06H, C02H, C03H
(air : about 10kΩ at 25°C(77°F),
pipe : about 5kΩ at 25°C(77°F)
- 48 -
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Part 4 Trouble Shooting
Error code
Description
Cause of error
• Heat-sink thermistor is damaged(short or open).
• Heat-sink Temp. is over 95°C(203°F)
Heat-sink Temp. is over
95°C(203°F)
Heat-sink thermistor
is open or short
4
• Damage or defect on the sensing circuit of outdoorpcb assembly.
(R01H, R02H, C01H)
Check flow
YES
YES
Heat-sink thermistor is connected
to outdoor PCB assembly?
Heat-sink thermistor in INV-IC is
Right ?
Sensing circuit of outdoor
pcb is right ?
No
No
No
Check heat-sink thermistor
- Check soldering state of
R01H, R02H, C01H
- Connect to CN-TH2 in
outdoor PCB assembly
-
Measure resistance of thermistor
(about 10kΩ at 25°C(77°F))
9k,12kBtu/h Model Heat-sink Thermistor resistance check
R-T Graph
120
100
80
60
40
20
0
Ω
20 30 40 50 60 70 80 90 100 110 120 130 [˚C]
[˚F]
68 86 104 122 140 158 176 194 212 230 248 266
Temperature
- 49 -
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Part 4 Trouble Shooting
Error code
Description
Cause of error
• 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)
3(GN/YL) 3(GN/YL)
4(RD)
Outdoor
1(BR)
2(BL)
Check if the power connector
is not connected to the
Terminal Block of the indoor
unit.
Check FUSE, NF01/02J, PTC,
Power Module, BD-01S in
Outdoor pcb assembly
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)
- 50 -
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Part 4 Trouble Shooting
Cause of error
Error code
Description
• Supplied power is not normal
•
Comp Connector (CN-U,V,W) is disconnected or inserted into the
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 into the 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
- 51 -
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Part 4 Trouble Shooting
Error code
Description
Cause of error
• 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 to marking on pcb and component)
- Spec of R01N (1kΩ), R02N (1.65kΩ) is correct
- Direction of diode (D01N, D02N) is right
- 52 -
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Part 4 Trouble Shooting
Cause of error
Error code
Description
• Indoor fan is locked or separated
• Fan connector is not connected to indoor pcb assembly
• Defective 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)
- 53 -
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Part 4 Trouble Shooting
Error code
Description
Cause of error
• Discharge pipe temp. is short or open
• Discharge pipe temp. is not connected to the outdoor pcb assembly
• Damage or defect on the sensing circuit of outdoor pcb assembly
Discharge pipe temp. is
short or open
10
Check flow
YES
YES
Discharge pipe temp. is connected
to Outdoor pcb assembly ?
Sensing circuit of outdoor
Discharge pipe temp. is right ?
pcb is right ?
No
No
No
Check Discharge pipe temp.
Connect to CN-D_PIPE
in outdoor pcb assembly
- Check soldering state of
R07H, R08H, C04H
-
Measure resistance of thermistor
(about 200kΩ at 25°C(77°F)).
- 54 -
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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 onto the 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.
- 55 -
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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 that the communication wires are correctly
connected.
¡ Adjust the connection of wire
¡ Confirm the wire is either “Live”, “Neutral”
3. Check the resistance between communication line and
GND. (Normal : Over 2MΩ)
4. Check that the communication cable is correctly
connected.
5. Check the connection of GND1, GND2, and main GND.
6. Check to see if one of the indoor units in operating properly
and the outdoor PCB is operating correctly.
¡ Check any other indoor units
* CH05 is displayed at indoor unit, CH53 is displayed at out-
door unit.
- 56 -
Only for training and service purposes
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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.
- 57 -
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Part 4 Trouble Shooting
4) Troubleshooting CH21, CH22
Error
Title
Cause of error
Check point & Normal condition
code
check if the compressor is locked or operating.
Check the compressor insulation and motor wire
resistance.
Check if the outdoor fan is locked or operating.
Check the IPM short.
Compressor output
current over.(30A↑)
21
22
DC_Peak
Check AC input voltage.
Check if the outdoor fan is locked or operating.
Check input current.
C/T
Internal circuit
Initial current error
Check the C01N DC voltage.
(From where the electricity is entering and Before
the product operates, Normality Vdc value is
2.5V 0.2V)
V
Check Point
1. Check the power source.
2. Check that the indoor fan is operating correctly.
3. Check the current.
4. Check the install conditions.
5. Check the internal circuit.
- 58 -
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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 DC Link Voltage.
• DC link volt. is
140VDC or lower.
23
DC Link
High voltage
• DC link volt. is
140VDC or higher.
• Check the power source.
• Check the DC Link Voltage.
28
Check Point
1. Check the power source.
2. Check the DC Link Voltage.
V
- 59 -
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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 or lower 300VAC
or higher).
• Check the power source.
• Check the components.
25
TRANS1
60Hz, 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 installation conditions for over loads.
3. Check that the SVC Valve is open.
2. Check the components
(Trans1, B/Diode, Diode, Resistance)
4. Check for the leakage of refrigerant.
- 60 -
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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 Reactor spec.
(18k,30k:10A/26.8mH, 24k:13A/13mH * 2)
Check AC input voltage.
PSC Fault
27
Check if the outdoor fan is locked or operating.
Check input current.
‘A’
‘B’
Check Point
• CH 27
Check the "IGBT" short point "B"
• CH 26
Check the connection of "U, V, W"
Check for shorts at check point "A".
Check for with the error code "21"
- 61 -
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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 installation conditions for over loads.
• Check for leakage of refrigerant.
• Check if the SVC V/V is open.
Note: If SVC V/V stands for service valves, please
use service valves in place of SVCV/V.
Discharge pipe (Inverter)
temp. high
• Discharge sensor
(Inverter) temp. high
32
(105°C(221°F)↑)
• Check the discharge pipe sensor for Cons.
• Check the installation conditions for over loads.
• Check for leakage of refrigerant.
Discharge pipe(Constant)
temp. high
• Discharge sensor
(Cons.) temp. high
33
40
(105°C(221°F)↑)
• Check if the SVC valve is open.
• Open/Short
• Soldered poorly
• Internal circuit error
• Normal resistor : about 0
Ω
CT Sensor
Discharge pipe temp.
Toff(105) °C
(221) °F
T2(95) °C
T1(90) °C
(203) °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 installation conditions for over loads.
2. Check if the SVC valve is open.
1. Check the installation conditions for over loads.
2. Check if the SVC valve is open.
3. Check for leakage of refrigerant.
3. Check for leakage of refrigerant.
4. Check the constant compressor. (same with CH21)
• CH 40
1. If the resistance of the sensor is only ∞ , the check Is
possible.
2 If the error occurs again after the reset , change the
PCB.
- 62 -
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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
Discharge 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)
Air sensor
44
45
46
47
65
• Open / Short
• Soldered poorly
• Internal circuit error
• Normal resistor : 5kΩ / at 25°C(77°F) (Unplugged)
• Normal voltage : 2.5VDC / at 25°C(77°F) (plugged)
Condenser Pipe sensor
Suction Pipe sensor
• 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
Discharge pipe sensor
(Constant)
• 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)
Heat sink sensor
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
- 63 -
Only for training and service purposes
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Part 4 Trouble Shooting
Inverter/Constant
Air R-T Table
Temperature(˚C/˚F)
Discharge pipe R-T Table
Resistance(kΩ)
Temperature(˚C/˚F)
20/68
Resistance(kΩ)
20/68
30/86
12.5
8
244
30/86
40/104
164.8
114
40/104
50/122
60/140
70/158
80/176
90/194
100/212
5.3
3.6
2.5
1.7
1.2
0.9
0.7
50/122
80.6
60/140
58.3
70/158
42.9
80/176
32.1
90/194
24.4
100/212
110/230
120/248
18.9
14.8
11.7
Condenser/Suction Pipe
Heatsink R-T Table
Pipe R-T Table
Temperature(˚C/˚F)
20/68
Resistance(kΩ)
Temperature(˚C/˚F)
20/68
Resistance(kΩ)
12.5
8
6.3
4
30/86
30/86
40/104
50/122
60/140
70/158
80/176
90/194
100/212
110/230
120/248
5.3
3.5
2.5
1.7
1.2
0.9
0.7
0.5
0.4
40/104
50/122
60/140
70/158
80/176
90/194
100/212
2.6
1.8
1.2
0.9
0.6
0.4
0.3
10) Troubleshooting CH51, CH60
Display
Title
Cause of error
Check point & Normal condition
code
• Check the PCB ASM P/No.
• Check for poor soldering.
EEPROM
Check sum
• Check sum error
60
Check Point
• CH 60
1. Check the condition of EEPROM.
2. Check for poor soldering
- 64 -
Only for training and service purposes
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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 if the fan is locked.
1. Check the the installation conditions for over loads.
(Refrigerant, Pipe length, Blocked, …)
2. Check if the Outdoor temp. is very high.
- 65 -
Only for training and service purposes
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Specifications and performance data subject to change without notice.
HEAT CONTROLLER, INC.
1900 WELLWORTH AVENUE • JACKSON, MICHIGAN 49203
THE QUALITY LEADER IN CONDITIONING AIR
P/NO : MFL41161604
20/02/2008
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