LG GR-K20SVZ User manual

MODEL: GR-K16SLQ
GR-K18SLQ
GR-K20SVZ
CAUTION! Before evaluating or servicing this product,
read the safety and operation rules in this manual.
Kimchi Storage
SVC Technical Manual

2
Safety Regulations
1. Make certain the storage does not present and electrical hazard.
2. Always unplug the storage before repairing it.
3. When testing the storage with the power on, use insulated gloves for safety.
4. Make certain instruments, such as a volt meter, are set for the appropriate
voltage range.
5. Do not allow water or moisture to get into the mechanical or electrical parts of the
storage.
6. Remove all foods, dishes, racks, etc. from the refrigerator before tilting it during
repairs to avoid spills.
7. Refer all repairs of the sealed system to an Authorized servicer who has the
appropriate refrigerant recovery equipment. Escaping refrigerant could cause injury,
pollute the air, or cause other environmental concern.
Contents
1. Safety Warnings and Cautions........................................................................... 3
2. Product Specifications........................................................................................ 6
3. Product Installation Method ............................................................................... 9
4. Circuit Diagram .................................................................................................. 10
5. MICOM Function and Description of Circuit ................................................... 14
6. Warnings for Disassembling Product.............................................................. 45
7. Exploded View and Part List............................................................................. 46

3
Safety Warnings and Cautions
Chapter 1
Chapter 1 Safety Warnings and Cautions
■Always observe SAFETY WARNINGS and CAUTIONS, which are intended to ensure safety while
repairing or operating the product.
■Hazards are separated into Warnings and Cautions, as explained below.
WARNING means a dangerous condition which could result in significant
damage, injury, or death if the instructions are NOT followed.
CAUTION means condition which could result in damage or injury if
instructions are not followed.
Warning
Caution
Warning
Use Caution to prevent electric shock.
• The control board (Main PCB) uses 310 V.
When replacing PCB parts, wait at least 3
minutes after unplugging. Always unplug the
storage before repairing.
Make sure that the power plug is not
pressed by the back of the storage.
• Power plug may be damaged and cause a fire
or electric shock.
Do not allow the consumer to repair,
disassemble, or modify the storage.
• There is a risk of damage, injury, electric
shock, or death.
Use a dedicated circuit.
• This storage should be installed on a dedicated
circuit. Overloading circuits or outlets could
cause a fire.

4
Safety Warnings and Cautions
Warning
This product should always be grounded.
• The product is equipped with a 3-wire
grounding cord which should be plugged into a
properly wired outlet. If you don't have the
proper outlet or are in doubt of the voltage or
grounding, we recommend consulting a
qualified electrician.
Do not store flammable liquids or gases in
the storage.
• Storing gasoline, ether, benzene, alcohol, etc.
can create the possibility of fire or explosion.
Use this product for its intended purpose.
• This storage is for making and storing kimchi.
Do not use it as a substitute for a precisely
controlled environment (as for storing
medications, documents, etc.) or for any other
purpose.
Use caution when disposing of a storage.
• Remove the door and do not leave it where
children may play in or around it. There is a risk
of child entrapment.
Do not set items, particularly flowers or
containers of liquid, on top of the storage.
• Spillage could result in safety, slippage, or
electrical shock hazards.
Do not store items on the storage. Use the
containers and racks included with your
storage.
• Items stored on the storage could fall and
cause injury.
Ether
Benzene
Alcohol

5
Safety Warnings and Cautions
Caution
Do not place bottles or cans in the storage.
•There is a possibility they could freeze, causing
the container to burst. This could present a
hazard in the form of broken glass or sharp
edges.
Always use exact replacement parts.
•Make certain replacement parts are the correct
part by part number and model number.
Ensure that voltage, current, and temperature
ratings are correct for the application.
During repairs, be sure all connectors are
tight and wires are properly routed.
•Loose wires could be damaged, causing shock
or fire hazards.
Be sure the power cord is undamaged.
•Do not bend, twist, pull, or damage the cord. It
could result in fire or electrical shock.
During repairs, remove all dust and foreign
materials from the work area.
•Keeping these areas clean makes work easier
and will prevent problems like overheating, fire,
and short circuits.
Allow time for resetting if you unplug the
storage.
•If you unplug the storage during repair, wait 5
minutes before plugging it in and restarting it.
Otherwise, you might cause compressor
failure.
5 min5 min
Rated Parts

6
Specifications
Chapter 2
Chapter 2 Product Specifications
1. GR-K16SLQ
Compressor
Evaporator
Refrigerant
Oil
PTC
Overload protection device
Fan motor for compressor cooling
Left compartment ripening heater
Right compartment ripening heater
Condensation heater
Capacitor (running)
Capacitor (starting)
ITEM SPEC
Usable Volume
Left compartment
Right compartment
Width
Depth
Height
Volume
158 l(5.58 ft3.)
92 l(3.25 ft3.)
66 l(2.33 ft3.)
817 mm (32.2 inches)
694 mm (27.3 inches)
878 mm (34.6 inches)
62 kg (137 lbs.)
210 W
Direct cooling
Manual Defrost
Polyurethane Foam
1
6 pcs.
2 pcs.
KX56LACH
PIPE ON SHEET
R134a (135 g)
FREOL @15 G (280 cc)
P6R8MB
4TM314TFB
Ø110 fan adhesion
115 V 80 W
115 V 60 W
115 V 17 W
250 Vac 10µF
160 Vac 100µF
Outside
Dimensions
Cold Cycle
Electrical Part Rating
Total weight
Motor power consumption
Cooling method
Defrost method
Insulation material
BASKET
Kimchi storage container
Low crystal deodorant system

7
Specifications
2. GR-K18SLQ
Compressor
Evaporator
Refrigerant
Oil
PTC
Overload protection device
Fan motor for compressor cooling
Left compartment ripening heater
Right compartment ripening heater
Condensation heater
Capacitor (running)
Capacitor (starting)
ITEM SPEC
Usable Volume
Left compartment
Right compartment
Width
Depth
Height
Volume
184 l(6.50 ft3.)
92 l(3.25 ft3.)
92 l (3.25 ft3.)
921 mm (36.3 inches)
694 mm (27.3 inches)
878 mm (34.6 inches)
67 kg (148 lbs.)
285 W
Direct cooling
Manual Defrost
Polyurethane Foam
1
6 pcs.
2 pcs.
KX56LACH
PIPE ON SHEET
R134a (140 g)
FREOL @15 G (280 cc)
P6R8MB
4TM314TFB
Ø110 fan adhesion
115 V 80 W
115 V 80 W
115 V 18 W
250 Vac 10µF
160 Vac 100µF
Outside
Dimensions
Cold Cycle
Electrical Part Rating
Total weight
Motor power consumption
Cooling method
Defrost method
Insulation material
BASKET
Kimchi storage container
Low crystal deodorant system

8
3. GR-K20SVZ
Compressor
Evaporator
Refrigerant
Oil
PTC
Overload protection device
Fan motor for compressor cooling
Left compartment ripening heater
Right compartment ripening heater
Condensation heater
Capacitor (running)
Capacitor (starting)
ITEM SPEC
Usable Volume
Left compartment
Right compartment
Width
Depth
Height
Volume
198 l(6.99 ft3.)
132 l(4.66 ft3.)
66 l(2.33 ft3.)
970 mm (36.2 inches)
698 mm (27.5 inches)
879 mm (34.61 inches)
70 kg (154 lbs.)
285 W
Direct cooling
Manual Defrost
Polyurethane Foam
1
10 pcs.
2 pcs.
KX56LACH
PIPE ON SHEET
R134a (145 g)
FREOL @15 G (280 cc)
P6R8MB
4TM314TFB
Ø110 fan adhesion
115 V 100 W
115 V 60 W
115 V 19 W
250 Vac 10µF
160 Vac 100µF
Outside
Dimensions
Cold Cycle
Electrical Part Rating
Total weight
Motor power consumption
Cooling method
Defrost method
Insulation material
BASKET
Kimchi storage container
Low crystal deodorant system
Specifications

9
Product Installation Method
Chapter 3
Chapter 3 Product Installation Method
1. Method to adjust height of storage
■Adjust the level of storage.
(If the floor is uneven, the storage may vibrate or cause noise.)
➲Adjust the front to be level by turning the height adjutsment screws under the front corners.
Tilting the unit backward slightly to take the weight off the adjusting screws may make this
task easier.
2. Grounding method
Plug the cord into a 115 V grounded outlet. If you are unsure of the voltage or grounding integrity,
consult a qualified electrician.
➲ Take care not to ground the circuit at one of the following places:
1. Water pipe: If there is plastic piping within the system, the ground may not be valid.
2. Gas pipe: There is the danger of fire or explosion.
3. Phone line or lightning rod: If lightning strikes, dangerous voltage may be induced
in the circuit.
CAUTION!

10
Circuit Diagram
Chapter 4
Chapter 4 Circuit Diagram
1. GR-K16, K18SLQ (LED MODULE TYPE)
3-WAY VALVE
MOTOR
PTC
STARTER
Mechanical Area
FAN MOTOR
LEFT MATURATION
HEATER
CONDENSATION
HEATER

11
Press and hold the FOOD button and the STORAGE TEMPERATURE button
simultaneously. If everything is correct, all LEDs will turn on. If there is a failure, all
LEDs EXCEPT the Remaining Maturation Time LED will turn on.
Press TEST
SWITCH once
Press TEST
SWITCH at
TEST1 once
Press TEST
SWITCH at
TEST2 once
Press TEST
SWITCH at
TEST3 once
Press TEST
SWITCH at
TEST4 once
Circuit Diagram

12
Circuit Diagram
3-WAY VALVE
MOTOR
PTC
STARTER
Mechanical Area
FAN MOTOR
LEFT MATURATION
HEATER
CONDENSATION
HEATER
2. GR-K20SVZ (LCD TYPE)

13
Press and hold the FOOD button and the STORAGE TEMPERATURE button
simultaneously. If everything is correct, all LEDs will turn on. If there is a
failure, all LEDs EXCEPT the Remaining Maturation Time LED will turn on.
Press TEST
SWITCH once
Press TEST
SWITCH at
TEST1 once
Press TEST
SWITCH at
TEST2 once
Press TEST
SWITCH at
TEST3 once
Press TEST
SWITCH at
TEST4 once
Circuit Diagram

14
MICOM Function and Description of Circuit
Chapter 5
Chapter 5 MICOM Function and Description of Circuit
1. Description of Function
1) Display
■GR-K16, K18SLQ (LED MODULE)
■GR-K20SVZ (LCD)
Temperature
setting
Temperature
setting
-0.5°C
2.5°C
-2.5°C
-18°C
-7°C
-0.5°C 2.5°C -2.5°C -18°C -7°C
DH DH
Temperature
setting -7°C -0.5°C 2.5°C -2.5°C -18°C
Power
Flavor Keeping
Select Foods
Select Temp.
Ripening Cycle Ripening Cycle
Select Temp.
Select Foods
Flavor Keeping
Lock/
Unlock Lock/ Unlock
Power
Cabbage-Kimchi
Radish-Kimchi
Mul-Kimchi
Fruit/Vegetable
Meat/Fish
Frozen Food
Fresh
Stand.
Mature
Min
Mid
Max
Ligh Freezing
Left Right
Lock Unlock Lock Unlock
Left
Compartment
Right
Compartment
1. On power-up, the display lights Cabbage Kimchi for both compartments and the temperature state is Mid.
2. Press Lock/Unlock before using the other buttons on the control panel. If the keypad is locked, the buttons will not
operate nor will the buzzer sound.
3. In the event of a power interruption, the displayed settings are maintained. However, when a power interruption
occurs during the ripening process, the unit defaults to its original status; that is Kimchi (Cabbage/radish/Mul-
Kimchi) / Mid.
4. Press the Select Foods button to cycle through the choices of Cabbage Kimchi ➠Radish Kimchi ➠Mul Kimchi
➠Fruit&Vegetable ➠Meat&Fish ➠Frozen Food.
5.Press the Select Temperature button to cycle through the selections of Mid ➠Max ➠Light Freezing ➠Min ➠Mid.
Light Freezing can be selected ONLY if the storage is set for Meat&Fish.

15
2) Food Storage/Maturation Function
(1) Selection of Food Storage Function
1. Press Lock/Unlock to release the lock.
2. Select Type of Food to keep and temperature.
3. If you wait more than 60 seconds, the Food Storage cycle begins by default.
4. Cabbage-Kimchi/Stand is the default unless you change it during the Keeping of Food process.
(2) Selection of Maturation Function
1. Press Lock/Unlock to release the lock.
2. Select a type of Kimchi and a Ripening degree by pressing the appropriate buttons and cycling
through the choices.
3. If you press Lock/Unlock once or wait more than 60 seconds, the Ripening Cycle begins.
4. The display counts down the time remaining in the cycle as ripening progresses.
5. The compressor switches on or off depending on the ambient temperature and the temperature in
the compartments of the storage. Additionally, the 3-way valve operates and the ripening heater
turns on and off.
6. As the ripening process completes (45~102 hours,) the setting defaults to the
Kimchi/Mid status and the kimchi is kept in cold storage.
7. At the end of the ripening process, the display shown 0 Day/00 Time Remaining Ripening Time.
Press the Lock/Unlock button once to turn the display off.
8. When switching from ripening to storage, the default temperature is set to Mid.
9. A ripening cycle cannot be selected when Fruits&Vegetables, Meats& Fish, or Frozen Food is
selected. These are Storage Cycles.
MICOM Function and Description of Circuit
Press
Lock/Unlock
to release lock
Select Type
of Food
Select
temperature
section
Press
Lock/Unlock
button once
Cycle
Begins
Wait
60 seconds
Press
Lock/Unlock to
release lock
Select Type
of Food
Select
Ripening
degree
Press
Lock/Unlock
button once
Cycle
Begins
Wait
60 seconds

16
MICOM Function and Description of Circuit
(3) Selection of Power On/Off Function
1. Press Lock/Unlock to release lock.
2. If you press and hold the Power button for two seconds, all functions of the affected compartment
stop and the LED displays OFF.
3. When the power of one compartment is off, the heater of the affected compartment is turned off
and 3-way valve is closed, while the 3-way valve of the opposite compartment is opened.
4. When the power of both compartments is off, the ripening heaters of both compartments, the
condensation heater, and compressor are also turned off.
5. If you wish to use a compartment that is not currently in use, press the Power button, which will
default the compartment to Cabbage Kimchi/Mid status.
(4) Control Pattern Drawing for Kimchi Ripening
1. The ripening control pattern varies, depending upon the temperature of the kimchi when it is
placed into the storage, the type of kimchi being made, and the degree of ripening selected.
2. In the 1st ripening cycle, if the Kimchi is at room temperature, the cold control operates.
3. During the ripening cycle, if Kimchi is cold, the ripening heater is turned on; if Kimchi is warm, the
ripening heater is turned off.
4. If a failure occurs, such as a sensor error during ripening, the storage will default to
Kimchi/Mid status.
3) Temperature Control Method
1. The compressor runs or stops and the 3-way valve opens or closes depending on the temperature
sensed in the left and right compartments.
Press
Lock/Unlock
Press and hold
the power
button for two
seconds
Power Off
Completion of
selection
Press the
power button
Power On
Completion of
Selection
Kimchi Sensor Temperature
Better Ripening 18°C
Ripening 14°C
Less Ripening 5°C
-0.5°C
: Ripening heater ON/OFF
: Ripening heater OFF
Time
Start of Ripening Completion of Maturation
Keeping
operation 1st ripening 2nd ripening 3rd ripening 4th
cooling
If Kimchi placed in the
refrigerator is cool
If Kimchi placed in the
refrigerator is at room
temperature
If Fresh is selected, the
second ripening cycle does
not run.
The time remaining
in the ripening cycle
is displayed on the
control panel of the
compartment.

17
MICOM Function and Description of Circuit
2. If the temperature in either compartment is unsatisfactory, the compressor is turned on and the
3-way valve is opened to the affected compartment.
3. If the temperature in both compartments is unsatisfactory, the compressor is turned on and runs
until both compartments become satisfactory. The 3-way valve is opened and closed to each
compartment alternatively until the temperature is satisfactory.
4. During the ripening cycle, if the temperature is LOW, the heater is turned ON; if the temperature is
HIGH, the compressor is turned on and the 3-way valve is opened.
NOTE) When the temperature is satisfactory in both compartments, the 3-way valve is open to
whichever compartment that has had a satisfactory temperature most recently.
■Summary Operation Chart of COMP and 3way Valve
4) Condensation Heater Control
1. At the top of the storage around the gasket, the condensation heater is always ON.
2. If you turn both compartments OFF, the condensation heater is also turned OFF; if you turn either
compartment on, the condensation heater is turned on.
5) Buzzer Sound
1. If you press a button on the control panel, the buzzer sounds Ding-Dong. (See Buzzer Operation
circuit, page 23, section 2.)
2. If you begin entering a program by pressing buttons but don't complete the program, the buzzer
sounds Ding.
6) Power Failure Compensation Function
1. When the power is restored after an outage, the storage performs the setting originally
programmed except for Failure Status and Test Mode.
2. If the power fails during the ripening process, there is no power outage compensation function and
the storage defaults to Kimchi/Mid status to protect against excessive ripening.
Left temperature Right temperature 3way valve position COMP
Satisfactory Satisfactory NOTE ❇OFF
Satisfactory Unsatisfactory Right compartment ON
Unsatisfactory Satisfactory Left compartment ON
Unsatisfactory Unsatisfactory
Left 20min/Right 20min ON
Left
Compartment
sensor
Temperature unsatisfactory
Temperature satisfactory
Temperature unsatisfactory
Temperature satisfactory
OPEN
CLOSE
OPEN
CLOSE
ON
OFF
Right
Compartment
sensor
3-way Valve
LEFT
3-way Valve
RIGHT
COMP.

18
MICOM Function and Description of Circuit
7) Operation in Response to Ambient Temperature
The storage senses the ambient temperature and adjusts the temperature in the compartments
accordingly. This keeps the storage from being too cold or too warm because of seasonal variations
and maintains exact temperatures in the compartments.
8) Sequential Operation of Components
Components (Compressor, 3-way Valve, Left/ Right Ripening Heater and Condensation Heater) are
operated in a specific order to prevent damage, noise, and electrical overload caused by
simultaneous operation of all parts when the unit is started and after completing the self-test routine.
❇Operation order may slightly vary depending on temperature setting.
When returning normal
status in test mode
Initial Power-up
Temperature of Left or
Right sensor is >10°C
(at purchase, after
moving or after a long
period of no use.)
Condensation
heater is set for
always ON,
but if the left and
right compartment
are simultaneously
turned off,
condensation
heater is turned
off, too.
The 3-way valve is
opened to both
compartments for 3
minutes; then it is
opened to either
the left or the right
compartment,
depending on the
temperature in the
compartments.
POWER
ON
CONDEN-
SATION
HEATER
ON
3WAY
VALVE
OPEN
3-WAY
VALVE
OPEN
BOTH
3WAY
VALVE
LEFT
OPEN
3-WAY
VALVE
OPEN
LEFT
3-WAY
VALVE
OPEN
BOTH
3-WAY
VALVE
OPEN
LEFT
COMPR-
ESSOR
ON
POWER
ON
CONDEN-
SATION
HEATER
ON
CONDEN-
SATION
HEATER
ON
LEFT
RIPENING
HEATER
ON
RIGHT
RIPENING
HEATER
ON
LEFT
RIPENING
HEATER
OFF
All
LOADS
OFF
RIGHT
RIPENING
HEATER
OFF
COM-
PRESSOR
ON
COM-
PRESSOR
ON
3sec 3min
7min
0.5sec
3sec 3min 10sec
0.5sec 0.5sec5sec
3sec 3min 10sec
Instantly
Instantly
Instantly
Operation Status Operation Order Remarks
Temperature of Left
and Right sensor is
<10°C. (In Power
failure or Service)
Season Spring Autumn WinterSummer
Operation in response to ambient temperature
In general operation
Storage Temperature
of the left and right
Compartments

20
MICOM Function and Description of Circuit
10) Test Mode
1. The test function checks the functions of the PCB and the storage, searching for failure indications.
2. The test switch on the PCB operates the test mode. The storage reverts to the normal mode after 2
hours if you forget to end it manually.
3. When the test mode is active, the buttons on the control panel are disabled but the buzzer still sounds
a ding if one is pressed.
4. When the test mode is completed, unplug the storage briefly and plug it in again to reset it and allow
normal operation.
5. If a sensor failure or other failure is detected during the test mode, release the test mode to display the
failure code.
6. During the display of the failure code, Test Mode doesn’t work even if you press the Test Switch.
TEST1 Press the test
switch once.
1) Compressor ON.
2) 3-way valve opens to the left and right
compartments alternatively at 20-minute
intervals.
3) Left and right ripening heaters OFF.
4) Condensation heater OFF.
5) LED displays 111.
❊This test checks the
refrigeration system for the
left and right compartments.
❊The system reverts to initial
status after a maximum of 2
hours.
TEST2
Press the test
switch once when
Test 1 indicates it
is completed.
1) Compressor ON.
2) 3-Way Valve opens to the Right
Compartment.
3) Left and right ripening heaters OFF.
4) Condensation heater OFF.
5) LED displays 222.
❊This test checks the
refrigeration system for the
right compartment only.
❊The system reverts to initial
status after a maximum of 2
hours.
TEST3
Press the test
switch once when
Test 2 indicates it
is completed.
1) Compressor ON.
2) 3-Way Valve opens to the Left
Compartment.
3) Left and right ripening heaters OFF.
4) Condensation heater OFF.
5) LED displays 333.
❊This test checks the
refrigeration system for the
left compartment only.
❊The system reverts to initial
status after a maximum of 2
hours.
TEST4
Press the test
switch once when
Test 3 indicates it
is completed.
1) Compressor OFF.
2) Left and right ripening heaters ON.
3) Condensation heater ON.
4) LED displays 444.
❊ This test checks the ripening
heaters and the condensation
heater.
❊ The system reverts to initial
status after a maximum of 30
minutes. When the
temperature of the
compartments is greater than
40°C, the storage defaults to
its initial status.
Normal
returning
Press the test
switch once when
Test 4 indicates it
is completed.
Return to initial status. ❊The compressor operates
after a delay of 7 minutes.
Mode Operation Contents Remarks

21
2. Description of Circuit
1) Power circuit
The power circuit consists of the noise attenuation part and the SMPS (switch mode power supply)
part. The SMPS consists of the rectifier (BD1 & CE1) to convert AC voltage to DC voltage, switching
part (IC2) to switch the converted DC voltage, transformer to transmit energy of the first side of the
switching end to the second side, the secondary power to supply power to MICOM and IC, and the
feedback part (IC3, ZD1) to feedback the secondary voltage to the first side of transformer in order to
maintain the secondary voltage constant.
: High voltage (310 Vdc) is maintained in this circuit. Wait at least 3 minutes after
unplugging to allow the current to dissipate. There is a danger of electric shock.
2) Oscillation circuit
The oscillation circuit provides the clock signal for synchronization and calculation of time in relation
to the logic elements of microprocessor IC 1. OSC 1 must always use the original rated parts,
because if the specification changes, the timing generated will not be correct, causing erratic
functioning of the microprocessor.
3) Reset circuit
The reset circuit allows the entire process to be started from the initial status by resetting the
microprocessor whenever power is applied to it at pin 29. LOW voltage is applied to the reset
terminal for 10 ms at the beginning of power input. The reset terminal has a voltage of 5 Vdc during
general operation. If the reset operation fails, the microprocessor will not operate.
Caution
MICOM Function and Description of Circuit