LG GR-131CN User manual

SAFETY PRECAUTIONS
Please read the following before servicing your refrigerator.
1. Check if electric leakage occurs in the set.
2. When servicing current applying parts, unplug prior to
servicing.
3. If testing with power on, wear rubber gloves to prevent
electric shock,
4. Be sure to check regular current, voltage, and capacity.
5. Don't touch metal products in a cold freezer
compartment with wet hands. It may cause frostbite or
other injury.
6. Prevent water flowing to electric elements in mechanical
parts,
7. When tilting the set, remove any materials on the set,
especially thin plate type (ex,: glass plates or books.)
8. When servicing evaporator part, wear cotton gloves to
prevent injury by sharp fins of the evaporator,
9. Do not open the sealed refrigeration system, It could
cause injury or pollute the air, Leave this job to an
autherized servicer with the appropriate refrigerant
recovery equipment.
SERVICING PRECAUTIONS
AIR RECHARGING IN COMPRESSOR
Test the refrigeration system by connecting it electrically
before beginning the refilling operation. This is necessary
to ascertain the function of the motor-compressor and
identify defects immediately. If defects have been found,
empty the old system of R134a residue by breaking off the
end of the extension piece at its narrow point. (Figure 1)
Use the appropriate refrigerant recovery equipment.
Replace the filter and any damaged components. Unsolder
and pull off the piece remaining inside the service tube and
then attach an extension with male Hansen, and 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 heating 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 60 minutes. (Figure 4)
POINT TO BE
BROKEN
SERVICE TUBE
EXTENSION
Figure 1
CHARGE TUBE FEMALE
EXTENSION HANSEN
MALE
HANSEN
SOLDERING
POINT
Figure 2
MP
PRESSURE
GAUGE
Figure 3 Figure 4
-3-

If a considerable leakage occurs, it will be necessary to
stop the vacuum pump will be necessary and add asmall
quantity of Freon to the system, if vacuum should not be
obtained (pressure gauge doesn't fall to 1atmosphere,)
Start the refrigeration unit and find the leakage with a
special leak4inder. When the defective soldering point is
visible, repair it after opening the extension tube valve and
reestablishing the normal outside pressure inside the
system.
Because the melted solder is sucked into the tubes and
blocks them, the pressure must be rebalanced when
vacuum is in the system for soldering. As soon as the
vacuum operation is over, add the quantity (in grams) of
R134a to the refrigeration system. Remember that every
system has an exact quantity of R134a with atolerance of
+5 grams than can be added. (Figure 5)
TO THE
R134a CYLINDER
___ TO THE
REFRIGERATION
SYSTEM
Figure 5
Before performing this operation (if the vacuum pump and
refilling cylinder are connected), make sure that the valve
placed between the vacuum pump and refilling tube are
closed to keep the Freen from adding to the system.
(Figure 6)
FILLING OR VALVE TO BE
F CHARGE TUBE OPENED WHEN
REFILLING
TO THE TO THE
REFRIGERATION CHARGE
SYSTEM CYLINDER
TO THE VALVE TO BE
VACUUM CLOSED
PUMP AFTER VACUUM
Figure 6
In addition, check the graduated scale on the cylinder for
the quantity of R134a to be added; for example, if we have
750 grams of Freon in the cylinder and must add 165
grams to the group, this amount will be reached when
R134a has dropped to 585 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 R134a flow 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 original
quantity of about 20-30 grams and close the valve
immediately thereafter,
The pressure rises and the motor-compressor must start,
sucking the gas and making the pressure go down again.
Regulate the valve again, maintaining the same manner
until reaching the quantity of R134a established for the
system being charged. When the system is running, the
suction pressure must be stabilized from 0.10 to 0.4
atmosphere.
Use ONLY R134a refrigerant.
Do not substitute any other type refrigerant.
Do not mix refrigerants.
-4-

SPECIFICATIONS
ITEMS SPECIFICATIONS
DOOR TYPE 1 DOOR
NET CAPACITY 3.32ft 3
CONDENSER TYPE WALL CONDENSER
(FLUSH BACK)
DEFROSTING SYSTEM MANUAL
TEMPERATURE CONTROL KNOB DIAL
ITEMS
INSULATION DO_OR
CABINET
EVAPORATOR
DIMENSION (WX H X D)
NET WEIGHT
REFRIGERANT
NS Series
LUBRICANT COMPRESSOR
SPECIFICATIONS
POLYURETHANE
POLYURETHANE
ROLL BOND TYPE
181/4 X 32g/16X lgW_6 in
48.50 Ib
R-134a (2,12 oz)
HTS-150 I FREOL _22G
I
(180 cc) /(180 cc)
±
PARTS IDENTIFICATION
EVAPORATOR (Inside Door)
- The heart of the refrigerator.
- It evaporatesthe refrigerant
fluid andthereby absorbs
heatfrom the surrounding.
ICE CUBETRAY(Inside Door)
Ice cube are easy to
remove from the tray
DRIP TRAY
Catches the water that
drips off the evaporator
when defrosting.
PLASTIC COATED
SHELVES
Have full width and can
slide out.
BAR
Keeps any kinds of fruits
and vegetables.
THERMOSTAT
Regulates the operation of
the motor and controls the
temperature inside the
refrigerator.
DOOR RACK
Keeps bottles, cans, or jars.
CAN SUPPORTER
Keeps any kinds of bottles.
MAGNETIC GASKET
Tight fitting door seal
keeps all the cooling
power locked inside.
- No hooks or latches.
BAR
Keeps cans.
NOTE : This is a basic model. The shape of refrigerator is subject to change.
-5-

DISASSEMBLY
*Disconnect the power before working on the refrigerator.
A. DOOR
1. Loosen 3 screws holding an upper hinge to separate the
door body. (Figure 7)
Figure 7
B, THERMOSTAT
1. Pull Knob Dial.
2. Loosen f screw holding the case and pull it out to
remove the Thermostat cover. (Figure 8)
3. Pull out thermostat in the theremostat cover, and
disconnect lead wires. (Figure 9)
NOTE : Replace a new thermostat with proper specification.
Figure 9
C. COMPRESSOR AND PTC
1. Remove Clamp, Protector Cover, Power Cord, and Lead
Wire first. (Figure 10)
2. Remove OLR
3. Remove PTC.
4. Remove the Compressor Base by loosening 4 bolts fixed
to base plate of the set. (Figure 11)
Figure 8
Figure 10 Figure 11
5. Remove the Compressor by loosening 2 earth screws
next to Compressor.
NOTE : Replace the Compressor, after peeling off
painted part of earth terminal.
• Compressor inhales the gas evaporated from Evaporator,
condenses this gas and then delivers to Condenser.
• PTC is abbreviation of Positive Temperature Coefficient,
is attatched to the Compressor, and operates motor.
• OLP prevents Motor coil from being started inside
Compressor.
• Do not turn the Adjust Screw of OLP in any way for
normal operation of OLR
-6-

CIRCUIT DIAGRAM
CIRCUIT DIAGRAM
BK
,.=,
BL
"R_ERMOSTAT
GN(GN/YL) _e: BK
6,_ACITOR-R
BLJ , _._MPRESSOR
P._C STARTER
YL :YELLOW
BK :BLACK
BL :BLUE
GN:GREEN
PK :PINK
THE PLUG TYPE ON CIRCUIT DIAGRAM IS SUBJECT
TO CHANGE IN DIFFERENT LOCALTIES. J652-00041C
NOTE: This isa basic circuit diagram. The specifications vary in different localities.
-7-

TROUBLESHOOTING
DEFECT CAUSE REMEDY
SYSTEM
PARTIALLY OR
COMPLETELY OUT
OF REFRIGERANT
CHARGE
EXCESSIVELY
FULL
HUMIDITY IN THE
SYSTEM
PRESENCE OF AIR
IN THE SYSTEM
BLOCKED
CAPILLARY
MOTOR-
COMPRESSOR
SHORT-CIRCUITED
OR BLOCKED
MOTOR-
COMPRESSOR
DOSE NOT
COMPRESS
NOISY MOTOR-
COMPRESSOR
EFFECT
Evaporatordoesnot frosteven
thoughmotor-compressorruns
continually.
This defectisindicatedbythe
presenceofwateroutsidethe
refrigeratornearthe motorcaused
byformationsof iceon the return
tube.
This defectisindicatedby the partial
frostingof the evaporatorandby
continua{defrostingcycles
determinedby the interruptionofthe
flow ofgas onthe evaporator.The
motorcompressorkeepsrunning.
Poorperformancedthe refrigerant
systemwhich isindicatedonthe
evaporatorwith a slightfrostwhich
does notfreeze and an excessive
overheatingofthe condenserand
motor-compressor.
Becausedthe lackdcirculation
Freon®in thesystem,there isno
frostingof the evaporator,whilea
slightoverheatingofthe first spiralof
the condenseris noted.
The systemdosenotwork and the
"OLP"intervenesinterrupting
deliveryto the motor-compressor.
Nofrostformson the evaporator,
evenif themotor-compressoris
apparentlyrunningregulary,
Incaseof mechanicalfailureinthe
motor-compressorthere in an
excessivenoisewhenthe systemis
functioning.Incasea suspension
springis unhooked,bangingwill be
heardandtherewill beespecially
strongvibrationswhen thesystem
starts upandstops.
An emptyrefrigerantsystem
indicatesaleakagedR134a.This
lossis generallyto belookedfor at
the solderingpointsconnectingthe
variouscomponentsor in an
eventualhole inthe evaporator
madeby the user.
If in the refrigerantsystema quantity
ofR134aisintroducedwhichis
greaterthanthat indicated,the
excessgas does notterminateits
expansionin the evaporatorbut
proceedsintothe returntube.
The refrigerantsystemis humid
when there isa smallpercentageof
waterpresent,which,not completely
retainedby the dehydratorfilter,
entersintocirculationwith the
Freon®and freezesatthe capillary
exitinthe evaporator.
There isair in the refrigerating
systemwhenduring thefilling phase
vacuumis not effectedor it isnot
adequatelydone.
Impuritiescontainedin the Freon@
or in thecomponentsofthe
refrigerationsystem before
assemblyand not retainedby the
filter can obstructthe capillary.
Incaseof shortcircuit,the
breakdownisdueto the electric
winding. Ifblocked,there is a
mechanicalfailurein the motor-
compressor.
Inthis casethere is a mechanical
failurein the diaphramvalveswhich
remainingcontinuallyopen, donot
permitthe compressortooperate.
Consequenteiy,Freon®doesnot
circulatein the system.
The causeof the excessivenoiseis
normallytobe soughtfor in a
mechanicalbreakdown,andonly
rarelyin the unhookingofone of the
suspensionsprings.
Leakagemustbe eliminatedby
resolderingthedefectivepointor
substitutingthe damaged
evaporator.
The system mustbe emptiedand
subsequentlyrefilledintroducingthe
correctquantityof R134a.
The system mustbe emptiedand
then refilledaftereliminatingthe
humidity.
Groupmustbedrainedand
subsequentlyrefilledaftercarefully
creatingvacuum.
Torestorethesystem it mustbe
emptied,substitutethe capillaryor
the evaporatorentirelyincase the
capillaryis coaxialwith respectto
the returntube,thenrefillit.
The motor,compressormustbe
replacedandthenproceedwith
refilling.
The motoFcomprossormustbe
replacedandthenproceedwith
refilling.
The motor,compressormustbe
replacedand thenproceedwith the
refilling.
-8-

NO COOLING
The Compressor
doesn't run. Check if the current
flows at the contacting
point of the Thermostat.
Check the current
flowing of starting
system.
Check if the current
flows at the main coil of
the Compressor.
Poor contacting point
Shorted or
Broken
Coil shorted
Replace the
Thermostat.
Replace the device.
Replace the
Compressor.
_1_Replace thecomponents.
Check if the current flows
at the contacting point of
the starting system.
Poor contacting point
and broken Replace the device.
-9-

COMPRESSOR AND ANOTHER ELECTRIC COMPONENTS
Separate the PTC-STARTER from
the Compressor and measure the
voltage between M and C of the
Compressor. Equal to the applied
voltage, (Rating
voltage + 10%)
T......... I [ Advice the customer
ne appElea voltage is not in me _ .
range of Rating Voltage + 10%. _ to use. m the
YES
YES
NO
NO
Replace the
PTC-STARTER.
YES
OLP works within 30 sec.
in forcible OLP operation
by turning instant power on _ NO Replace OLR
Measure minimum starting voltage
after checking steps 1-3 above,
Measure the pressure balance of
the PTC at the interval of more
than 5 min.
Starts at the voltage of I ._[ Check the starting
Stolttaegattaherve?ular
-10-

PTC
Poor starting or no
operating of the
Compressor. 4P
First, separate the PTC from
the Compressor and check the
voltage between NO 5 and 6
in the PTC with a multitester or
Wheatstone Bridge.
Normal "L Check other
electric
components.
__ Abnormal _ Replace the
PTC.
___ Replace thePTC.
Separate the OLP from
the Compressor and
check resistance value
between two terminals of
OLP with Tester.
o
÷ m ÷
-11-

EXPLODED VIEW
I
J
-12-