LG GR-051CN 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 begee beginning 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 CHARGE TUBE FEMALE
BROKEN EXTENSION HANSEN
MALE
HANSEN
SERVICE TUBE SOLDERING
EXTENSION POINT
Figure 1 Figure 2
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 a small
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 the
special leak-finder. 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
block 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 a tolerance 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 Freon from adding to the system.
(Figure 6)
FILLING OR VALVE TO BE
_ 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.
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1. SPECIFICATIONS
ITEMS
DOOR TYPE
NET CAPACITY
CONDENSER TYPE
DEFROSTING SYSTEM
TEMPERATURE CONTROL
SPECIFICATIONS
1 DOOR
46 !
WALL CONDENSER
(FLUSH BACK)
MANUAL
KNOB DIAL
ITEMS
INSULATION DOOR
CABINET
EVAPORATOR
DIMENSION (WX H X D)
NET WEIGHT
SHELF
REFRIGERANT
NS Series
LUBRICANT COMPRESSOR
SPECIFICATIONS
POLYURETHANE
POLYURETHANE
ROLL BOND TYPE
177h6X 193/4X173/4in
15 Kg
1 PIECE
R-134a (43g)
HTS-150 FREOL c_22G
(180 cc) (180 cc)
2. PARTS IDENTIFICATION
THERMOSTAT
Regulates the operation of
the motor and controls the
temperature inside the
refrigerator.
EVAPORATOR
- The heart of the refrigerator.
- It evaporates the refrigerant
fluid and thereby absorbs
heatfrom the surrounding.
- Made of pure aluminum.
ICE CUBE TRAY
Ice cubes are easy to
remove from the tray
Keeps bottles, cans, or jars.
PLASTIC SHELF
It is full width and can slide
out and catches the water
that drips off the
evaporator when
defrosting.
Crisper for fruits and
vegetables.
DOOR SEAL
Keeps the refrigerator
virtually airtight all along
the edge, but is
nevertheless easy to open.
BAR
Keeps cans.
-5-

3. DISASSEMBLY
* Disconnect the power before working on the refrigerator.
A. DOOR
1. Loosen 1 screw holding an cover hinge and 3 screws
holding an upper hinge to separate the door body.
(Figure 7)
Figure 7
B. THERMOSTAT
1. Pull Knob Dial. (Figure 8)
2. Loosen 1 screw holding the case to remove the
Thermostat cover. (Figure 9)
Figure 8 Figure 9
C. COMPRESSOR AND PTC
1. Remove Protector Cover, Power Cord, and Lead Wire
first. (Figure 11)
2. Remove OLR
3. Remove PTC.
4. Remove the Compressor Base by loosening 4 bolts
fixed to base plate of the set. (Figure 12)
Figure 11 Figure 12
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 attached 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 nomal
operation of OLR
3. Pull out thermostat in the thermostat cover, and
disconnect 2 or 3 lead wires. (Figure 10)
NOTE : Replace a proper specification new thermostat.
Figure 10
-6-

4. CIRCUIT DIAGRAM
CIRCUIT DIAGRAM
BK
BL
"R_ERMOSTAT
YL -_____ BK
GN(GN/YL) _ _:
Ii ,,,'_=Ii F.,,,_.,u_\
BE[ _M. Mj::_.MPRESSOR__
= =
P.'_CSTARTER
, YL :YELLOW
BK :BLACK
BL:BLUE
GN:GREEN
PK:PINK
THE PLUG TYPE ON CIRCUIT DIAGRAM IS SUBJECT
TO CHANGE IN DIFFERENT LOCALTIES. 3854JD1009E
NOTE : This isa basic circuit diagram. The specifications vary in different localities.
-7-

5. 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 theevaporatorandby
continualdefrostingcycles
determinedby the interruptionofthe
flow ofgas onthe evaporator.The
motorcompressorkeepsrunning.
Poorperformanceofthe refrigerant
systemwhichis indicated:onthe
evaporatorwith a slightfrostwhich
does notfreeze and anexcessive
overheatingofthe condenserand
motor-compressor,
Becauseofthe lackofcirculation
Freonin the system,there is no
frostingof the evaporator,whilea
slightoverheatingofthe first spiralof
the condenseris noted.
The systemdoesnotwork andthe
"OLP"intervenesinterrupting
deliveryto the motor-compressor.
No frostformson the evaporator,
even ifthe motor-compressoris
apparentlyrunningregulary.
Incaseof mechanicalfailurein the
motor-compressorthere in an
excessivenoisewhenthe system is
functioning.Incasea suspension
springis unhooked,bangingwill be
heardand therewill be especially
strongvibrationswhen thesystem
starts upand stops.
An emptyrefrigerantsystem
indicatesaleakageof R134a.This
lossis generallyto belookedfor at
the solderingpointsconnectingthe
variouscomponentsor in an
eventualhole inthe evaporator
madeby the user.
If in the refrigerantsystemaquantity
of R134aisintroducedwhichis
greaterthanthatindicated,the
excessgas does notterminateits
expansionin the evaporatorbut
proceedsintothe returntube.
The refrigerantsystemis humid
when there isa smallpercentageof
waterpresent,which,notcompletely
retainedby the dehydratorfilter,
entersintocirculationwith the
Freon®and freezesatthe capillary
exitin the evaporator,
There isair in the refrigerating
systemwhenduring thefilIing 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
breakdownisdue tothe electric
winding. Ifblocked,there is a
mechanicalfailurein the motor-
compressor.
Inthis casethere is a mechanical
failurein the diaphramvalveswhich
remainingcontinuallyopen, donot
permitthe compressortooperate.
Consequentely,Freon®does not
circulatein the system.
The causeof the excessivenoiseis
normallytobe soughtfor in a
mechanicalbreakdown,andonly
rarelyin the unhookingofone of the
suspensionsprings.
Leakagemustbeeliminated by
resolderingthe defectivepointor
substitutingthe damaged
evaporator,
The system mustbe emptiedand
subsequentlyrefilledintroducingthe
correctquantityof R134a.
The system mustbe emptiedand
thenrefilledaftereliminatingthe
humidity.
Groupmustbedrainedand
subsequentlyrefilledaftercarefully
creatingvacuum.
Torestorethesystemit must be
emptied,substitutethe capillaryor
the evaporatorentirelyincasethe
capillaryis coaxialwith respectto
the returntube,then refillit,
The motor-compressormustbe
replacedandthenproceedwith
refilling.
The motor-comprossormustbe
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 if the current
flows at the main coil of
the Comprossor,
Poor contacting point
Coil shorted
Replace the
Thermostat,
Replace the
Compressor,
Poor running of the
Compressor.
Poor contacting point
and broken Replace the device.
-9-

COMPRESSOR AND ANOTHER ELECTRIC COMPONENTS
YES
YES
NO
NO
Replace the
PTC-STARTER,
OLP works within 30 sec. YES
in forcible OLP operation
byturning instant power on _ NO
a o,.
Check the
starting state.
Measure minimum starting voltage
after checking steps 1-3 above,
Measure the pressure balance of
the PTC at the interval of more
than 5 rain.
Starts at the voltage
of 85% below. Normal.
-10-

PTC
Poor starting or no
operating of the
Compressor.
First, separate the PTC from
the Compressor and check the
voltage between NO 5 and 6
in the PTC with amuititester or
Wheatstone Bridge,
Check other
electric
components.
___ Replace the
PTC,
___ Replace thePTC,
4D
Separate the OLP from
the Compressor and
check resistance value
between two terminals of
OLP with Tester.
©
÷ m ÷
-11 -

6. EXPLODED VIEW
%&
I
NOTE : Parts are subject to change in different localities.
-12-