LG GR-051SF User manual

SAFETY PRECAUTIONS
Please read the followings before servicing your refrigerator.
1. Check if an electric leakage occurs in the set.
2. When servicing current applying parts, unplug prior to
servicing.
3. In case of testing with power injecting, wear rubber
gloves to prevent electric shock.
4. Ifyou use any appliances, check regular current, voltage
and capacity.
5. Don't touch metal products in cold freezer room with wet
hand. It may cause frostbite.
6. Prevent water flowing to electric elements in mechanical
parts.
7. When sloping 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
without fail. it is to prevent wound by sharp fin of
evaporator.
9. Leave a breakage freezing cycle to a heavy service
center. The gas in cycle inside may soil ambient air.
SERVICING PRECAUTIONS
AIR RECHARGING IN COMPRESSOR
Test the refrigeration system by connecting it electrically
before refilling operation. This is necessary to ascertain the
function of the motor-compressor and identify the defects
immediately. Ifthe defects have been found, empty the old
system of eventual R-12 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 extension completely 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, -t atm., -760 mm Hg) in any
case it is advisable to keep the pump running for about
30 minutes. (Figure 4)
POINT TO BEE]
BROKEN
SERVICE TUBEE]
EXTENSION
Figure I
CHARGE TUBEE] FEMALEr
EXTENSION HANSEN
MALEE]
HANSEN
SOLDERINGE]
POINT
Figure 2
PRE
GAUGE
Figure 3 Figure 4
-3-

In case that a considerable leakage occurs and 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 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-
12 to the refrigeration system. Remember that every
system has an exact quantity of R-12 with a tolerance of
-+5grams than can be added. (Figure 5)
TO THED
R-12 CYLINDER
TO THED
REFRIGERATIOND
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 for adding to the system. (Figure 6)
FILLING ORB VALVE TO BE []
_ CHARGE TUBE ,PENED WHEN []
REFILLING
TO THE• TO THE []
REFRIGERATIOND CHARGE[]
SYSTEM CYLINDER
VALVE TO BED
VACUUM[ CLOSED[]
PUMP AFTER VACUUM
Figure 6
In addition, check the graduated scale on the cylinder for
the quantity of R-12 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 R-12
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 R-12 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.
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 R-12 established for the
system being charged. When the system is running, the
suction pressure must be stabilized from 0.30 to 0.6
atmosphere.
-4-

AIR RECHARGING IN COMPRESSOR
Test the refrigeration system by connecting it electrically
before refilling operation. This is necessary to ascertain the
function of the motor-compressor and identify the defects
immediately. Ifthe defects have been found, empty the old
system of eventual R134a 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 extension completely 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, -t atm., -760 mm Hg) in any
case it is advisable to keep the pump running for about
60 minutes. (Figure 4)
POINT TO BED
BROKEN
SERVICE TUBED
EXTENSION
Figure I
CHARGE TUBED FEMALEF
EXTENSION HANSEN
MALED
HANSEN
SOLDERINGD
POINT
Figure 2
; I VACUUMD
_ PUMP
PRE
GAUGE
Figure 3 Figure 4
-5-

In case that a considerable leakage occurs and 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 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
Rt34a to the refrigeration system. Remember that every
system has an exact quantity of Rt34a with a tolerance of
-+5grams than can be added. (Figure 5)
F _ TO THE[]
Ri34a CYLINDER
TOT RAT,ON[]
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 for adding to the system. (Figure 6)
FILLING ORD VALVE TO BE []
_ CHARGE TUBE OPENED WHEN D
REFILLING
TO THED TO THE D
REFRIGERATIOND CHARGE[]
SYSTEM CYLINDER
TO THE VALVE TO BE[]
VACUUME 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.
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.
-6-

1. SPECIFICATIONS
ITEMS
DOOR TYPE
NET CAPACITY
CONDENSER TYPE
DEFROSTING SYSTEM
TEMPERATURE CONTROL
SPECIFICATIONS
1DOOR
46 l
WALL CONDENSER
(FLUSH BACK)
MANUAL
KNOB DIAL
ITEMS
INSULATION DOOR
CABINET
EVAPORATOR
DIMENSION
NET WEIGHT
SHELF
REFRIGERANT
VS Series
COMPRESSOR
LUBRICANT NS Series
COMPRESSOR
SPECIFICATIONS
POLYURETHANE
POLYURETHANE
ROLL BOND TYPE
443(W)X501(H)X450(D)mm
15 Kg
1 PIECE
R-12(40g) R-134a(43g)
HTS-150 FREOL a22G
(200cc) (200cc)
HTS-150 FREOL a22G
(180cc) (180cc)
2. PARTS IDENTIFICATION
THERMOSTAT
Regulates the operation of
the motor and controls the
temperature inside the
refrigerator.
EVAPORATOR
The heart ofthe refrigerator,
It evaporates the refrigerant
fluid andthereby absorbs
heatfrom the surrounding.
Made of pure aluminum.
Keeps butter.
ICE CUBE TRAY
Ice cube is easy to remove
from the tray
PLASTIC SHELF
It has full width and can
slide out and catches the
water that drips off the
evaporator when
defrosting.
DOOR SEAL
Keeps the refrigerator
virtually airtight all along
the edge, but is
nevertheless easy to open.
BOTTLE SUPPORTER
Keeps bottles, cans or jars.
-7-

3. DISASSEMBLY
A. DOOR
1. Loosen 1screw 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 Thermo
cover. (Figure 9)
Figure 8 Figure 9
C. COMPRESSOR AND PTC
1. Remove Protector Cover, Power Cord and Lead Wire
first. (Figure 11)
2. Separate OLR
3. Separate 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
and condenses this gas and then delivers to Condenser.
• PTC is abbreviation of Positive Temperature Coefficient
and 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
disconnecting 2 or 3 lead wires. (Figure 10)
NOTE : Replace a proper specification new thermostat.
Figure 10
-8-

2000.03.13 100/70
CIRCUIT DIAGRAM
BK
THERMOSTAT
Y"
_, i i GN(GI_.)
_l 4N-I
BL
BK
BL_ _ __C_IOMPRESSOR
P.T.CSTARTER
YL :YELLOW
BK:BLACK
BL:BLUE
GN:GREEN
PK:PINK
THE PLUG TYPE ON CIRCUIT DIAGRAM IS SUBJECT
TO CHANGE IN DIFFRENT LOCALTIES. 3854,JD1009E

5. TROUBLESHOOTING
DEFECT CAUSE REMEDY
GROUP PARTIALLY
OR COMPLETELY
OUT OF
REFRIGERANT
CHARGE
EXCESSIVELY
FULL
HUMIDITY IN THE
SYSTEM
PRESENCE OF AIR
IN THE SYSTEM
BLOCKED
CAPILLARY
MOTOR-
COMPRESSOR
SHOR_CIRCUITED
OR BLOCKED
MOTOR-
COMPRESSOR
DOSE NOT
COMPRESS
NOISY MOTOR-
COMPRESSOR
EFFECT
Evaporatordosenot frosteven
thoughmotor-compressorruns
continually.
This defectisindicatedbythe
presenceofwateroutside
refrigeratornearthe motor caused
byformationsof ice onthe return
tube.
This defectis indicatedbythe partial
frosting ofthe evaporatorandby
continualdefrostingcyctes
determinedbythe interruptionofthe
flow ofgas onthe evaporator.The
motorcompressorkeeps running.
Poorperformanceofthe refrigerant
systemwhichis indicated:onthe
evaporatorwith a slightfrost which
dose notfreeze and anexcessive
overheatingof the condenserand
motor-compressor.
Becauseofthe lackofcirculation
Freonin the system,there is no
frosting ofthe evaporator,while a
slightoverheatingof thefirst spiral
ofthe condenser isnoted.
The systemdose notwork andthe
"clixson"intervenesinterrupting
deliverytothe motor-compressor.
Nofrostformsonthe evaporator
evenif the motor-compressoris
apparentlyrunningregulary.
in caseofmechanicalfailure inthe
motor-compressorthere inan
excessivenoisewhenthe system is
functioning:incase a suspension
springis unhooked,bangingwill be
heardandtherewillbe especially
strong vibrationswhen the system
startsup and stops.
An emptyrefrigerantsystem
indicatesaleakageof R_2.This loss
isgenerallyto belookedfor atthe
solderingpointsconnectingthe
variouscomponentsor in an
eventual hotein the evaporator
madebythe user.
If in the refrigerantsystemaquantity
of R_2isintroducedwhichisgreater
thanthat indicated,the excessgas
dose not terminateits expansionin
the evaporatorbut proceedsinto the
returntube.
The refrigerantsystemis humid
when there isa small percentageof
waterpresentwhich,notcompletely
retainedby the dehydratorfilter,
enters intocirculationwiththe Freon
and freezesat the capillaryexit in
the evaporator.
There isair in a refrigeratingsystem
when duringthe filling phase
vacuum isnot effectedor it is not
adequatelydone.
Eventuatimpuritiescontained in the
Freonor inthe componentsofthe
refrigerationsystembefore
assemblyand not retainedbythe
filter canobstructthe capillary.
Incaseofshortcircuit,the
breakdownis dueto the electric
winding: if blocked,there isa
mechanicalfailurein the motor-
compressor.
Inthis casethere isa mechanical
failurein the diaphramvalveswhich:
remainingcontinuallyopen, do not
permitthe pistonto suckand
compressorthe which
consequente]ydosenotcirculatein
the system.
The causeof theexcessivenoise is
normallyto be soughtfor in a
mechanicalbreakdown, and only
rarelyin theunhookingof oneof the
suspensionsprings.
Leakagemustbeeliminatedby
resolderingthedefectivepointor
substitutingthe damaged
evaporator.
Thesystem mustbe emptiedand
subsequentlyrefilledintroducingthe
correctquantityof R_.
Thesystem mustbe emptiedand
thenrefilledafter eliminatingthe
humidity.
Groupmust bedrainedand
subsequentlyrefilledaftercarefully
creatingvacuum.
Torestorethe systemit must be
emptied,substitutethe capillaryor
the evaporatorentirelyin casethe
capillaryiscoaxialwith respectto
the returntube, thenrefillit.
Themotor-compressormustbe
replacedandthenproceedwith
refilling.
Themotor-comprossormustbe
replacedandthenproceedwith
refilling.
Themotor-comprossormustbe
substitutedandthenproceedwith
the refilling.
-10-

NO COOLING
The Compressor
doesn't run. Check if the current
flows at the contacting
point of the Thermostat.
Poor contacting point Replace the
Thermostat.
Check the components
on the main circuit.
Check if the current
flows at the contacting
point of the starting
system.
Poor contacting point
and broken Replace the device.
-11 -

COMPRESSOR AND ANOTHER ELECTRIC COMPONENTS
Separate the PTC-STARTER from
the Compressor and measure the
voltage between M and C of the
Compressor.
YES
YES
NO
NO
OLP works within 30 sec.
in forcible OLP operation
YES
NO
Measure minimum starting voltage
after checking steps 1-3 above.
And measure the pressure balance
of the PTC with the interval of
more than 5 min.
-12-