LG GN-U192SL User manual

CAUTION
BEFORE SERVICING THE UNIT, READ THE "SAFETY
PRECAUTIONS" IN THIS MANUAL.
REFRIGERATOR
SERVICE MANUAL
http:// biz.lgservice.com
MODEL : GN-U192SL/SLK/SVK
GN-U212SK/SL/SLK/SV
GN-U222/U232SK/SL/SLK/SV

7
SAFETY PRECAUTIONS..................................................................... ....................................................................... .........
SPECIFICATIONS.................................................................... ....................................................................... .....................
PARTS IDENTIFICATION.................................................................... ....................................................................... ..........
DISASSEMBLY....................................................................... ....................................................................... .................... 7-8
DOOR.....................................................................................................................................................................................
DOOR SWITCH......................................................................................................................................................................7
THERMOSTAT........................................................................................................................................................................
FAN AND FAN MOTOR..........................................................................................................................................................
DEF' CONTROL ASM.............................................................................................................................................................8
REFRIGERATOR ROOM LAMP.............................................................................................................................................
CONTROL BOX-R..................................................................................................................................................................
ADJUSTMENT....................................................................... ....................................................................... .....................
9-10
COMPRESSOR......................................................................................................................................................................9
PTC-STARTER.......................................................................................................................................................................9
OLP (OVER LOAD PROTECTOR).......................................................................................................................................10
CIRCUIT DIAGRAM.................................................................... ....................................................................... .................
TROUBLESHOOTING..................................................................... ....................................................................... ........1 -1
COMPRESSOR AND ELECTRIC COMPONENTS...............................................................................................................
11
PTC AND OLP........................................................................................................................................................................
DEFROST TIMER..................................................................................................................................................................
ANOTHER ELECTRIC COMPONENT...................................................................................................................................
SERVICE DIAGNOSIS CHART..............................................................................................................................................
REFRIGERATING CYCLE................................................................................................................................................16-17
EXPLODED VIEW....................................................................... ....................................................................... ............ 18 -20
CONTENTS
Please read the following instructions before servicing your
refrigerator.
1. Check the refrigerator for current leakage. 7. Close the top door before opening the bottom door.
Otherwise, you might hit your head when you stand up.
2. To prevent electric shock, unplug before servicing.
8. When tilting the refrigerator, remove any materials on
3. Always check line voltage and amperage. the refrigerator, especially the thin plates(ex. Glass
4. If you use any kind of appliance, check regular current, shelf or books.)
voltage and capacity. 9. When servicing the evaporator, wear cotton gloves.
5. Don't touch metal products in the freezer with wet This is to prevent injuries from the sharp evaporator
hands. This may cause frostbite.
6. Prevent water from following onto electric elements in
the mechanical parts.
fins.
10. Leave the disassembly of the refrigerating cycle to a
specialized service center. The gas inside the circuit
may pollute the environment.
SAFETY PRECAUTIONS
- 2-
SERVICING PRECAUTIONS..................................................................... ....................................................................... ....
2
3
4
6
7
7
7
DISPENSER...........................................................................................................................................................................
8
8
8
2
12
13
14
15
13

AIR RECHARGING IN COMPRESSOR
Test the refrigeration system connecting it electrically before
refilling operation. It is necessary to ascertain the function
of the motor-compressor and identify the defects
immediately. If defects have been found, empty the old
system of possible R-134a residue by breaking off the end
of the extension piece at its narrow point. (Figure 1)
Replace the filter and any damaged components. Unsolder
and pull off the piece remaining inside the service tube and
then attach an complete extension with male Hansen and
at last, solder it to the same tube again. (Figure 2)
It is necessary to execute the soldering operation with
valve open so that the fumes caused by oil residue can
come out freely without blowholes between two tubes
during the heating the of the point to be soldered.
The extension fitted with the male Hansen is connected to
the female fitting of the vacuum pump tube. (Figure 3)
Air evacuating from the system begins as soon as the
pump starts. The refrigeration system must be kept under
vacuum until the reading on the low-pressure gauge
indicates vacuum (0 absolute, -1 atm., -760 mm hg) in any
case it is advisable to keep the pump running for about 30
minutes. (Figure 3)
In case that a considerable leakage occurs it will be
necessary to stop the vacuum pump and to add asmall
quantity of Freon to the system, if vacuum should not be
obtained (pressure gauge can't fall to 1 atmosphere), start
the refrigeration unit and find the leakage with the special
leak-finder. When the defective soldering point is visible,
re-do it after opening the extension tube valve and
reestablishing the normal outside pressure inside the
group.
Because the melted alloy is sucked into the tubes and
block them, the pressure must be rebalanced when
vacuum is in the system in soldering. As soon as the
vacuum operation is over, add the quantity in grams of
R-134ato the refrigeration system. Remember that every
system has an exact quantity of R-134awith a tolerance of
Before performing this operation (if the vacuum pump and
refilling cylinder are connected), make sure that the valve
placed between the vacuum pump and the refilling tube are
closed in order to keep the Freon for addition to the system.
(Figure 5)
In addition, check the graduated scale on the cylinder for
the quantity of R-134ato be added, for example, if we
have 750 grams of Freon in the cylinder and must add 140
grams to the group, this amount will be reached when
R-134ahas dropped to 610 grams, remembering that the
indicator shows a lower limit of meniscus. Do this after
choosing the scale corresponding to the gas pressure
different scales reported as the same gas pressure
indicated by the pressure gauge on the top of the column.
To make R-134aflow into the system, open the valve
placed at the base of the cylinder and connected to the
filling tube. The amount of Freon cannot be added to the
system all at
once because it may cause a blocking of motor-
compressor.
Therefore, proceed by adding the original
quantity of about 20-30 grams and close the valve
immediately.
The pressure rises and the motor compressor must start
sucking the gas and lowering the pressure again. Regulate
the valve again, maintaining the same manner until
reaching to the quantity of R-134aestablished for the
system being charged. When the system is running, the
suction pressure must be stabilized between 0.30 to
0.6(0.10 to 0.4) atmosphere.
SERVICING PRECAUTIONS
- 3-
POINT TO BE BROKEN
SERVICE TUBE EXTENSION
CHARGE TUBE
EXTENSION
FEMALE
HANSEN
MALE HANSEN
SOLDERING POINT
Figure 1 Figure 2
TO THE
VACUUM
PUMP
PRESSURE
GAUGE
Figure 3
TO THE R-134a CYLINDER
TO THE REFRIGERATION
SYSTEM
Figure 4
FILLING OR VALVE TO BE OPENED
CHARGE TUBE WHEN REFILLING
TO THE REFRIGERATION TO THE CHARGE
SYSTEM CYLINDER
VALVE TO BE CLOSED
AFTER VACUUM
TO THE
VACUUM
PUMP Figure 5
5 grams that can be added. (Figure 4)

- 4-
1-2 GN-U212
1. SPECIFICATIONS
ITEMS SPECIFICATIONS
FREEZER 51
NET CAPACITY REFRIGERATOR 125
TOTAL 176
DIMENSIONS (mm) 535(W)
X 580(D) X 1410(H)
NET WEIGHT (kg) 44
COOLING SYSTEM aF n Cooling
TEMPERATURE CONTROL
Full Automatic
DEFROSTING SYSTEM Heater Defrost
With a Timer
OUT CASE
INNER CASE A B S
INSULATION tPolyure hane Foam
Coated Steel Sheet
( l)
ITEMS SPECIFICATIONS
FREEZER 1 EA
REFRIGERATOR 2 EA
VEGETABLE TRAY
EGG TRAY 1 EA
ICE MAKER
TWIST ICE TRAY(*) TWIST ICE TRAY & ICE BANK
ICE TRAY ICE TRAY & ICE BANK
DEODORIZER 1EA
COVER LOWER 1EA
COMPRESSOR
CONDENSER
REFRIGERANT
LUBRICATING OIL
DEFROSTING DEVICE
EVAPORATOR
SHELF
Knob
Drawer Type
P.T.C Starting Type
Fin Tube Type
Pipe On Sheet Type
R134a (105g)
FREOL α22G (210cc)
L-CORD, PLATE HEATER
VITAMIN KIT 1EA
(*) OPTIONAL
ITEMS SPECIFICATIONS
FREEZER 51
NET CAPACITY REFRIGERATOR
TOTAL 149
DIMENSIONS (mm) 535(W)
X 585(D) X 1260(H)
NET WEIGHT (kg) 42
COOLING SYSTEM aF n Cooling
TEMPERATURECONTROL
Full Automatic
DEFROSTINGSYSTEM Heater Defrost
With a Timer
OUT CASE
INNER CASE A B S
INSULATION tPolyure hane Foam
Coated Steel Sheet
( l)
ITEMS SPECIFICATIONS
FREEZER 1 EA
REFRIGERATOR
VEGETABLETRAY
EGG TRAY 1 EA
ICE MAKER
TWIST ICE TRAY(*) TWIST ICE TRAY & ICE BANK
ICE TRAY ICE TRAY & ICE BANK
DEODORIZER 1EA
COVER LOWER 1EA
COMPRESSOR
CONDENSER
REFRIGERANT
LUBRICATINGOIL
DEFROSTING DEVICE
EVAPORATOR
SHELF
(*) : OPTIONAL
Knob
Drawer Type
P.T.C Starting Type
Fin Tube Type
Pipe On Sheet Type
R134a (105g)
FREOL a 22G (210cc)
L-CORD, PLATE HEATER
98
(*)
1 EA
1-1 GN-U192

- 5-
ITEMS SPECIFICATIONS
FREEZER 51
NET CAPACITY REFRIGERATOR 128
TOTAL 179
DIMENSIONS (mm) 535(W) X 580(D) X 1475(H)
NET WEIGHT (kg) 46
COOLING SYSTEM
TEMPERATURE CONTROL
Full Automatic
DEFROSTING SYSTEM With a Timer
OUT CASE
INNER CASE
INSULATION Polyurethane Foam
( l)
ITEMS SPECIFICATIONS
FREEZER
REFRIGERATOR
VEGETABLE TRAY
ICE MAKER
TWIST ICE TRAY(*)
ICE TRAY
COMPRESSOR
EVAPORATOR
CONDENSER
REFRIGERANT
LUBRICATING OIL
DEFROSTING DEVICE
SHELF
(*) OPTIONAL
aF n Cooling
Knob
Heater Defrost
A B S
Coated Steel Sheet
1 EA
2 EA
Drawer Type
DEODORIZER 1EA
TWIST ICE TRAY & ICE BANK
ICE TRAY & ICE BANK
DEODORIZER 1EA
COVER LOWER 1EA
P.T.C Starting Type
Fin Tube Type
Pipe On Sheet Type
R134a (105g)
FREOL α22G (210cc)
L-CORD, PLATE HEATER
1-3 GN-U222/GN-U232
VITAMIN KIT 1 EA

2. PARTS IDENTIFICATION
- 6-
NOTE : This is a basic model. Theshape of refrigerator is subject to change.
Freezer Temperature
Control Dial
Freezer Shelf
Twisting Ice Serve
General Type Ice Tray
Refrigerator Temperature
Control Knob
Lamp
Cover Lower
Deodorizer
Chilled Compartment
FREEZER
COMPARTMENT
REFRIGERATOR
COMPARTMENT
Vegetable Drawer
Used to keep fruits
and vegetables, etc.
fresh and crisper.
Shelves
All parts shown may not be included with every model.
Cover Pump
Movable Rack
Egg Storage Rack
Freezer Door Rack
Water Tank
Refrigerator Door
Rack
Laveling Screws
Vitamin Kit
*
*
*
*
*
*
(*) Optional part

Figure 9
2
Figure 7
LOWER HINGE
BOLT Figure 8
3-4 FAN AND FAN MOTOR
1. Remove the freezer shelf.
2. Separate the Guide Ice Tray by pulling right.
3. Loose 1 screw.
4. Pull out the Grille Fan and Shroud-F.
SCREW
Figure 11
INSU' MULTI DUCT
THERMOSTAT
CONT' BOX-R
KNOB THERMOSTAT
COVER LAMP-R
HOLDER THERMOSTAT
Figure 10
3-3 THERMOSTAT
1. Remove the Cover Lamp-R by the use of ‘_’ type driver
inserting in the low holes of the cover.
2. Loose 2 screw.
3. Pull the Control Box-R.
4. Disconnect the Housing of lead wire.
5. Separate the INSU’MultiDuct and Control Box-R.
6. Diassemble the Knob..
7. Separate the Thermostat and Control Box-R.
8. Separate the Thermostat and Holder thermostat.
9. Disconnect the lead wire.
3-2 DOOR SWITCH3-1 DOOR
Freezer Door
Separating the Hinge Upper.
Open the freezer door and remove the Hinge Upper (2)
By unscrewing 2 screws (1). In this case, be careful not
To drop the freezer door. (Figure 6)
Separating the Freezer Door.2.
Refrigerator Door
1. Loosen hexagonal bolts fixing the Lower Hinge to the
2. Pull out the door gasket to remove from the door foam
Ass'y.
- 7-
1.
Open the freezer door to 90 degrees and grasp it with
right hand and grasp the Hinge Upper (2) with left hand.
Slide the freezer door to the Front so as to remove the
O
Hinge Upper (2) from the ceiling of the refrigerator, and
separate the freezer door by lifting it up. (Figure 7)
body to remove the refrigerator door only.
1. To remove the door switch, pull out it with a ‘_’ type
driver as shown in (figure 9).
2. Disconnect the lead wire from switch.
3. DISASSEMBLY
1
1
2
Figure 6

5. Disconnect the housing of lead wire.
6. Separate the Fan Assy.
7. Loose 2 screw fixed to the Bracket.
8. Pull out Shroud-F remove the Fan Motor Assy.
9. Separate the Motor Bracket and Rubber.
3-5 DEF' CONTROL ASSY
Def control Assy consists of Defrost Thermostat and Fuse M.
Defrost Thermostat functions to defrost automatically and it
is attached to metal side of the Evaporator and senses
Temp.
Fuse-M is a kind of safety device for preventing over-
heating of the Heater when defrosting.
At the temperature of 77 C, it stops the emission of heat
from the Heater.
1. Pull out the Shroud after removing the Grille.
2. Separate the connector connected with the Def Control
Assy and replace the Def Control Assy after cutting the
Tie Wrap and removing the Holder Fuse. (Figure 14)
3-6 REFRIGERATOR ROOM LAMP
1. Remove the cover lamp-R by pulling with a ' _ ' type
driver.
2. Remove the lamp-R by turning.
3-7 CONTROL BOX-R
1. Remove the Cover Lamp-R.
2. Loosen 2 screws.
3. Full the Control Box-R.
4. Separate the lead wire Housing.
- 8-
SHROUD-F
BRACKET
FAN MOTOR
GRILLE FAN
FAN
Figure 12
SHROUD-F
Figure 13
DEF CONTROL ASM
Figure 14
REFRIGERATOR ROOM LAMP
Figure 15
CONTROL BOX-R
COVER LAMP
KNOB THERMOSTAT
Figure 16
3-8 DISPENSER (Optional)
1. Take out the water tank.
2. Disassemble the cover assy pipe & tank cap.
3. Loosen 1 screw which connect cover pump to door.
4. Take out motor pump, pipe suction and rubber motor
from cover pump.
5. Disassemble pipe suction and rubber motor.
Figure 10

4-1 COMPRESSOR
4-1-1 Role
The compressor inhales low temperature and low pressure
gas evaporated from Evaporator of the Refrigerator, and
condenses this gas to high temperature and high pressure
gas, and then plays delivering role to Condenser.
4-1-2 Composition
The Compressor is Composed of Compressor Apparatus
compressing gas, Compressor Motor moving Compressor
Apparatus and Case protecting Compressor Apparatus
and Motor. There are PTC-Starter, and Over Load
Protector (OLP) in the Compressor outside.
On the other
hand, because the Compressor consists of 1/1000mm processing
precision components and is sealed after producing without dust
or humidity, deal and repair with care.
4-1-3 Note to Use
(1) Be careful not to allow over-voltage and over-current.
(2) No Strike
If applying forcible power or strike (dropping or careless
dealing), poor operation and noise may occur.
(3) Use proper electric components appropriate to the
Compressor.
(4) Note to Keep Compressor.
If Compressor gets wet in the rain and rust in the pin of
Hermetic Terminal, poor operation and poor contact
may cause.
(5) Be careful that dust, humidity, and flux due to welding
don't inflow in Compressor inside in replacing
Compressor. Dust, humidity, and flux due to welding
which inflows to Cylinder may cause lock and noise.
4-2 PTC-STARTER
4-2-1 Composition of PTC-Starter
(1) PTC (Positive Temperature Coefficient) is no-contact
semiconductor starting device which uses ceramic
material and the material consists of BaTiO3.
(2) The higher the temperature is, the higher resistance
value becomes . These features are used as starting
device of Motor.
4-2-2 Role of PTC-Starter
(1) PTC is attached to Hermetic Compressor used for
Refrigerator, Show Case and starts Motor.
(2) Compressor for household refrigerator applies single-
phase induction Motor.
For normal operation of single-phase induction motor, in
the starting operation flows in both main coil and sub-
coil. After the starting is over, the current is cut off in
subcoil. The proper features of PTC play the above all
roles. So, PTC is used as a starting device of motor.
4-2-3 PTC-Applied Circuit Diagram
According to Starting Method of Motor
4-2-4 Motor Restarting and PTC Cooling
(1) For restarting after power off during normal
Compressor Motor operation, plug the power cord after
5 min. for pressure balance of Refrigerating Cycle and
PTC cooling.
(2) During normal operation of Compressor Motor, PTC
elements generate heat continuously. Therefore,
if PTC isn't cooled for a while after power off, Motor
can't operate again.
4-2-5 Relation of PTC-Starter and OLP
(1) If power off during operation of Compressor and power
on before PTC is cooled, (instant shut-off within 2 min.
or reconnect a power plug due to misconnecting),
PTC isn't cooled and a resistance value grows. As a
result, current can't flow to the sub-coil and Motor can't
operate and OLP operates by flowing over current in
only main-coil.
(2) While the OLP repeats on and off operation about 3-5
times, PTC is cooled and Compressor Motor performs
normal operation.
If OLP doesn't operate when PTC is not cooled,
Compressor Motor is worn away and causes circuit-
short and fire. Therefore, use a proper fixed OLP
without fail.
4-2-6 Note to Use PTC-Starter
(1) Be careful not to allow over-voltage and over-current.
(2) No Strike
Don't apply a forcible power or strike.
(3) Keep apart from any liquid.
If liquid such as oil or water inflows into PTC,
PTC materials it may break due to insulation
breakdown of material itself.
(4) Don't change PTC at your convenience.
Don't disassemble PTC and mold. If damaging to
outside of PTC-starter, resistance value alters and poor
starting of compressor motor may cause.
(5) Use a properly fixed PTC.
4. ADJUSTMENT
- 9-
OVERLOAD PROTECTOR
C
COMPRESSOR
PTC 5MOTOR
M
SM
S
6
3
HERMETIC
PTC STARTER TERMINAL
RSIR
Figure 17

4-3 OLP (OVERLOAD PROTECTOR)
4-3-1 Definition of OLP
(1) OLP (OVERLOAD PROTECTOR) is attached to the
Compressor and protects the Motor by cutting the
current to the Motor if the temperature rises and
activates the bimetal spring in the OLP.
(2) When over-voltage flows to Compressor motor, the
Bimetal works by heating the heater inside the OLP,
and the OLP protects Motor by cutting off current which
flows to the Compressor Motor.
4-3-2 Role of the OLP
(1) The OLP is attached to the Hermetic Compressor used
for the Refrigerator and Show Case and prevents the
Motor Coil from being started in the Compressor.
(2) Do not turn the Adjust Screw of the OLP in any way for
normal operation of the OLP.
(Composition and connection Diagram of OLP)
- 10-
CONTACTING
POINT COVER
BIMETAL
CONTACTING
POINT
HEATER
TERMINALS
ADJUST
SCREW
HEATER
BIMETAL
Figure 18

- 11 -
NOTE : 1. This is a basic diagram and specifications vary in different localities.
5. CIRCUIT DIAGRAM
Non Dispenser Model
Dispenser Model
BN / YL
YL YL
THERMOSTAT
GYGY
DEF TIMER
POWER
SUPPLY
CORD
BK
WH
DOOR
S/W-R
FAN
MOTOR
GN / YL BN BO
3
1
4
2
BN
PR
WH
RD
LAMP-R
THERMAL
FUSE
RD
P.T.C
STARTER
BL
BL
BL
M
4
2
3
5
6
THE PLUG TYPE,COMPRESSOR EARTH PART ON CIRCUIT DIAGRAM
ARE SUBJECTED TO CHANGE IN DIFFERENT LOCALITIES.
YL :YELLOW
WH:WHITE
BL :BLUE
BK:BLACK
PR :PURPLE
BN:BROWN
GY:GREY RD:RED PK:PINK
BO:BRIGHT ORANGE
BK
BK
COMPRESSOR
BK
M
SC
GN:GREEN
DEF
THERMO

6. TROUBLESHOOTING
- 12 -
6-1 COMPRESSOR AND ELECTRIC COMPONENTS
1 2
5
5
3
2
3 4 5
4
3
5
5
4
5
1
YES
YES
YES
NO
YES
NO
YES YES
NO
YES
NO
NO
Power Source. Remove the PTC-Starter
from the Compressor
and measure the voltage
between Terminal C of
Compressor and
Terminals 5 or 6 of PTC.
No Voltage. Replace OLP.
Reconnect.
Replace
PTC-Starter.
Replace OLP.
O.K.
Check connection
OLP disconnected?
Advise the customer
to use a regular
Trans.
Replace Compressor.
OLP works within
30 sec. in forcible
OLP operation by
turning instant power
on and off.
Applied voltage isn't
in the range of Rating
Check the resistance
among M-C, S-C and
M-S in Motor
Compressor.
Check the resistance
of two terminals in
PTC-Starter.
Check if applying
a regular OLP.
Measure minimum
starting voltage after 5
min. for balancing cycle
pressure and cooling
the PTC.
Check the
resistance of
Motor
Compressor.
Check the
resistance of
PTC-Starter.
Check OLP.
Check
starting state.
condition
+ 10 % )
_
Components start in
The voltage of Rating
(Rating Voltage
Voltage + 10 %
_
+ 10 %
_
Components start in
Voltage
below.

6-4 ANOTHER ELECTRIC COMPONENTS
Cooling is impossible
- 14 -
Compressor
doesn't run.
Running state of
Compressor is poor.
Check a starting
voltage.
Check if current flows to
the following
components.
a. Thermostat
b. Starting devices
c. OLP
d. Compressor coil
e. Defrost Timer
f. Circuit parts
Low voltage.
Poor contacting and
gas leakage.
Shorted or broken.
Poor contacting
or shorted.
Coil shorted.
Poor contacting
or shorted.
Poor contacting
and broken.
Shorted.
Lack of capacity.
Coil of Motor
Compressor.
Replace
the compressor.
Replace
each component.
Raise the voltage.
Replace
each component.
Cause
Check if current flows
to starting devices.
Check current flowing
in sub-coil of
Compressor.
Check capacity of OLP.
The items described
above are normal.
Cooling ability is poor
Fan motor
doesn't run.
Much frost are sticked
to the EVAPORATOR.
Poor contacting.
Coil is shorted.
Shorted.
Replace
each component.
Replace
each component.
Replace
each component.
Running is poor.
(Coil is shorted.)
Check current flowing
of the door S/W.
Check current flowing
in the Fan Motor.
Check the running
condition of Timer.
Check current flowing
of the following
components.
L-CORD, TE-PLATE
HEATER
Check current flowing
of the following
components.
Def Control Assy

6-5 SERVICE DIAGNOSIS CHART
- 15 -
In addition to the items described above, refer to the followings to solve the complaint.
Check if dew forms
in the Freezer.
Replace the
Components of
defrosting circuit.
Check Refrigerating
Cycle.
Check the
Thermostat.
Defrosting is poor.
The cycle is faulty. Repair the cycle.
Replace the
Thermostat.
The operation of the
Thermostat is poor.
COMPLAINT POINTS TO BE CHECKED REMEDY
Cooling is Is the power cord unplugged from the outlet? Plug to the outlet.
impossible. Check if the power S/W is setted to OFF. Set the switch to ON.
Check if the fuse of power S/W is shorted. Replace a regular fuse.
Measure the voltage of power outlet. If voltage is low, wire newly.
Cooling ability Check if the set is placed close to wall. Place the set with the space of about 10cm.
is poor. Check if the set is placed close to stove, gas Place the set apart from these heat sources.
¥cooker and direct rays.
Is the ambient temperature high or Make the ambient temperature below.
¥the room door closed?
Check if putting in hot food. Put in food after they get cold.
Did you open the door of the set too often Don't open the door too often and close
¥or check if the door is closed up? ¥it firmly.
Check if the TEMP. CONTROL is set to MIN. Set the knob to MID.
Freezing ability Is the ambient temperature too LOW(10 C)? For colder freezer, turn theFREEZERTEMP.
is poor ¥CONTROL to "6"~"7", and the REFRIGERATOR
TEMP. CONTROLto MAX.
Check if the FREEZERTEMP. CONTROL Turn the TEMP. CONTROL to 3~6.
is set to 1~2?
Food in the Are food placed in cooling air outlet? Place food in high temperature section.
Refrigerator ¥(Front Part)
are frozen. Check if the TEMP. CONTROL is set to MAX. Set the knob to MID.
Dew or ice Are watery food kept? Seal up watery food with vinyl wrap.
forms in the Check if putting in hot food. Put in food after getting cold.
chamber of Did you open the door of the set too Don't open the door too often and close
the set. often or check if the door is closed up. ¥it firmly.
Dew forms Check if ambient temperature and humidity Wipe dew with a dry cloth. This happening
in the Out Case. are high. ¥is solved in low temperature and humidity
¥naturally.
Is the gap in the door packing? Fill up the gap.
Abnormal Is the set positioned in a firm and even place? Adjust the Leveling Screw, and place
noise generates. ¥in the firm place.
Does any unnecessary objects exist Remove the objects.
¥in the back side of the set?
Check if the Cover Evaporating Tray is omitted. Place it on an original position.
Check if the cover of mechanical room Place the cover at an original position.
in below and front side is taken out.
To close the door Check if the door packing becomes dirty Clean the door packing.
is not handy. ¥by filth such as juice.
Is the set positioned in a firm and even place? Position in the firm place and adjust the
¥Leveling Screw.
Are too much food put in the set? Keep foods from reaching to the door.
Ice and food Check if the inside of the set becomes dirty. Clean the inside of the set.
smell unpleasant. Did you keep smelly foods without wraping? Wrap smelly food.
It smells plastic. The new products smell plastic, but it is

6-6 REFRIGERATING CYCLE
Troubleshooting Chart
- 16 -
Leakage Detection
Observe discharging point of refrigerant which may be in oil discharging part in compressor and hole of evaporator.
YES
YES
Whether Compressor
runs or not.
Whether frost
forms or not in
Evaporator.
Observe the discharging
amount of Refrigerant.
Inject Refrigerant to
Compressor and check
cooling operation.
Clogged by dust. Gas leakage.
Faulty
Compressor.
Moisture Clog.
Whether oil leaks
or not.
Normal formed frost
Normal amount
No or much amount
(Check the leakage point)
Normal formed
frost in Evaporator
No frost or forms
PARTIAL Freezer and Low flowing sound of A little high
in inlet only
Check Comprossor
A little Refrigerant
LEAKAGE Refrigerator Refrigerant is heard and more than ¥discharges.
don't get cold frost forms in inlet only ambient Normal cooling is possible
normally. temperature. ¥when injecting Refrigerant
¥of regular amount.
WHOLE Freezer and Flowing sound of Refrigerant Equal to ambient No discharging of Refrigerant.
LEAKAGE Refrigerator is not heard and frost isn't temperature. Normal cooling is possible
don't get cold formed. ¥when injecting Refrigerant
at all. ¥of regular amount.
PARTIAL Freeze room and Flowing sound of Refrigerant A little high Normal discharging of
CLOG Refrigerator is heard and frost forms more than ¥refrigerant.
don't get cold in inlet only. ambient The capillary tube is faulty.
normally. temperature.
WHOLE Freezer and Flowing sound of Refrigerant Equal to ambient Normal discharging of
CLOG Refrigerator is not heard and frost isn't temperature. ¥Refrigerant.
don't get cold. formed.
MOISTURE Cooling operation Flowing sound of Refrigerant Low than Cooling operation restarts
CLOG stops periodically. is not heard and frost melts. ambient ¥when heating the inlet of
temperature ¥capillary tube.
COMP- Freezer and Low flowing sound of A little high The pressure of high
RESSION Refrigerator Refrigerant is heard and than ambient ¥pressure part in
don't get cold. frost forms in inlet only. temperature. ¥compressor is low.
NO COMP- No compressing Flowing sound of Refrigerant Equal to ambient No pressure of high pressure
RESSION operation. is not heard and no frost. temperature. ¥part in compressor.
CAUSE
TEMPERATURE
OF THE
COMPRESSOR
REMARKS
STATE OF STATE OF THE
THE SET EVAPORATOR
LEAKAGE
CLOGGEDBYDUST
DEFECTIVE
COMPRESSION

General Control of Refrigerating Cycle
- 17 -
NO. ITEMS UNIT STANDARDS PURPOSES REMARKS
Pipe and
piping system
opening time
Welding
N2sealed
parts
Refrige-
ration
Cycle
Refrigerant
weighing
Drier
replacement
Leak check
1
2
3
4
5
6
7
Min.
Nitrogen
pressure
Confirm
N2leak
Min.
Torr
EA
EA
EA
EA
Pipe: within 1 hour.
Comp: within 10 minutes.
Drier: within 20 minutes.
Weld under Nitrogen
atmosphere.
(N2pressure:
0.1~0.2 kg/cm2)
Confirm air leaking sounds
when removing rubber cap.
Sound: usable
No sound: not usable
More than 40 minutes
Below 0.03 (ref)
High and low pressure sides
are evacuated at the same
time for models above 200 l.
Use R-134a exclusive
manifold.
Use R-134a exclusive.
R-134a exclusive.
R-134a exclusive.
Use R-134a exclusively.
Weighing allowance: 5g
Note: Winter: -5g
Summer: +5g
- Use R-134a exclusively for
R-134a refrigerator.
- Use R-12 exclusively for
R-12 refrigerator.
-
Replace drier whenever repairing
refrigerator cycle piping.
To protect
moisture
penetration.
To protect oxide
scale formation.
To protect
moisture
penetration.
- Do not use soapy water for
check. It may be sucked
into the pipe by vacuum.
To remove moisture.
To protect mixing
of mineral and
ester oils.
To protect R-12
refrigerant mixing.
"
"
Do not mix with
R-12 refrigerant.
To remove the
moisture from
pipe inside.
Defect
refrigerant leak
area.
The opening time should be reduced
to a half of the standards during rain
and rainy seasons (the penetration of
water into the pipe is dangerous).
- Refer to repair note in each part.
- R-134a refrigerant is more
susceptible to leaks than R-12 and
requires more care during welding.
-
Do not apply force to pipes before and
after welding to protect pipe from cracking.
- In case of evaporator parts, if it
doesn't make sound when removing
rubber cap, blow dry air or N2gas for
more than 1 min and use the parts.
Note: Only applicable to the model
equipped with reverse flow
protect plate.
Vacuum efficiency can be improved
by operating compressor during
evacuation.
The rubber pipes for R-12 refrigerant
shall be melted when they are used for
R-134a refrigerant (causes of leak).
- Do not weigh the refrigerant at too
hot or too cold an area.
(77 F[25 C] is adequate.)
- Make Copper bombe
Socket: 2SV Plug: 2PV R-134a
Note: Do not burn O-ring (rubber)
during welding.
- Check oil leak at refrigerant leak
area. Use electronic leak detector if
oil leak is not found.
- The electronic leak detector is very
sensitive to halogen gas in the air. It
also can detect R-141b in urethane.
Please practice, therefore, many
times before use.
Evacuation
time
Vacuum
degree
Vacuum
Vacuum
piping
Pipe
coupler
Outlet
(Socket)
Plug

2. *
7. EXPLODED VIEW
- 18 -
106B
319A
282B
301A
303A
303A
401A
418A
281B
104C
310A
308A
314A
307A
309A
312A
317A
105A
410C
410B
*
410G
*
411A
410A
158C
407A
120E
120G
120B
110A
120A
283B
106A
129A
406B
409B
103C
120C
604F
604E
NOTE: 1. The parts of refrigerator and the shape of each part are subject to change in different localities.
: optional parts
- Twist Ice Tray : 110B, 125A, 125H, 131A
- General Ice Tray : 125A, 131A
- Dispenser Set Asm : 611A,611M,611N,611P-T
7-1 CASE SET ASM (GN-U192,GN-U212,GN-U222/GN-U232)
313A
315A *

- 19 -
7-2 DOOR SET ASM (GN-U192,GN-U212,GN-U222/GN-U232)
*: optional parts
205A
405C
404A
330B
332A
110B
149A
125A
131A
125H
149B
140A
149C
149C
154A
151A
405A
329A
203A
200A
241D
241C
241B
233A
230A
125A
131A
*
*
*
*
*
*
605A
*
241F
201A
210A
212G
231A
*
281D

P/No. 3828JP8007D