LG GR-051CN Owner's manual

LG GR-051CN Owner's 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 other injury.

with wet hands.

It may cause frostbite or

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 motorcompressor 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

CHARGE TUBE FEMALE

EXTENSION HANSEN

SERVICE TUBE

EXTENSION

Figure 1

MALE

HANSEN

SOLDERING

POINT

Figure 2 Figure 3

PRESSURE

GAUGE

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 1 atmosphere.)

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)

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

CHARGE TUBE

TO THE

REFRIGERATION

SYSTEM

TO THE

VACUUM

PUMP

VALVE TO BE

REFILLING

OPENED WHEN

TO THE

CHARGE

CYLINDER

VALVE TO BE

CLOSED

AFTER VACUUM

_-__

TO THE

R134a CYLINDER

Figure 5

TO THE

REFRIGERATION

SYSTEM

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-

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

LUBRICANT

NS Series

COMPRESSOR

SPECIFICATIONS

POLYURETHANE

POLYURETHANE

ROLL BOND TYPE

177h6X 193/4X 173/4in

15 Kg

1 PIECE

R-134a (43g)

HTS-150

(180 cc)

FREOL c_22G

(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 heat from the surrounding.

- Made of pure aluminum.

Keeps bottles, cans, or jars.

ICE CUBE TRAY

Ice cubes are easy to remove from the tray

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)

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)

B. THERMOSTAT

Figure 7

1. Pull Knob Dial. (Figure 8)

2. Loosen 1 screw holding the case to remove the

Thermostat cover. (Figure 9)

Figure 8 Figure 9

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 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

Figure 10

-6-

4. CIRCUIT DIAGRAM

CIRCUIT DIAGRAM

"R_ERMOSTAT

BK

,

-_____

_ _:

BK

YL :YELLOW

BK :BLACK

BL:BLUE

GN:GREEN

PK:PINK

Ii ,,,'_=Ii F.,,,_.,u

BL

BE[

_M.

= =

P.'_CSTARTER

THE PLUG TYPE ON CIRCUIT DIAGRAM IS SUBJECT

TO CHANGE IN DIFFERENT LOCALTIES.

3854JD1009E

NOTE : This is a basic circuit diagram. The specifications vary in different localities.

-7-

5. TROUBLESHOOTING

DEFECT

SYSTEM

PARTIALLY OR

COMPLETELY OUT

OF REFRIGERANT

CHARGE

EFFECT

Evaporatordoes not frost even though motor-compressorruns continually.

CAUSE

An empty refrigerantsystem indicatesa leakage of R134a.This

loss is generallyto be lookedfor at the soldering pointsconnectingthe various componentsor in an eventualhole in the evaporator made by the user.

REMEDY

Leakagemust be eliminated by resolderingthe defective pointor substitutingthe damaged evaporator,

EXCESSIVELY

FULL

HUMIDITY IN THE

SYSTEM

This defect is indicated by the presence of water outside the refrigerator near the motorcaused by formationsof ice on the return tube.

If in the refrigerantsystema quantity of R134a is introducedwhich is greater than that indicated,the excessgas does not terminateits expansionin the evaporatorbut proceedsinto the return tube.

The system mustbe emptiedand subsequentlyrefilled introducingthe correctquantity of R134a.

This defect is indicated by the partial frosting of the evaporatorand by continual defrostingcycles determined by the interruptionof the flow of gas on the evaporator.The

motor compressorkeepsrunning.

The refrigerantsystemis humid when there is a small percentageof water present, which, not completely retainedby the dehydratorfilter, enters into circulation with the

Freon®and freezes at the capillary exitin the evaporator,

The system mustbe emptiedand

then refilled after eliminatingthe humidity.

PRESENCE OF AIR

IN THE SYSTEM

BLOCKED

CAPILLARY

MOTOR-

COMPRESSOR

SHORT-CIRCUITED

OR BLOCKED

MOTOR-

COMPRESSOR

DOSE NOT

COMPRESS

NOISY MOTOR-

COMPRESSOR

Poorperformanceof the refrigerant systemwhich is indicated: on the evaporatorwith a slightfrost which does not freeze and an excessive overheatingof the condenserand motor-compressor,

There is air in the refrigerating systemwhen during the filIing phase vacuum is not effectedor it is not adequatelydone.

Group must be drained and subsequentlyrefilled after carefully creatingvacuum.

Because of the lack of circulation

Freon in the system,there is no frosting of the evaporator,while a slight overheatingof the first spiral of the condenseris noted.

Impuritiescontainedin the Freon® or in the componentsof the refrigerationsystem before assemblyand not retainedby the filter can obstructthe capillary.

To restore the system it must be emptied,substitute the capillaryor the evaporator entirely in case the capillaryis coaxial with respectto the return tube,then refill it,

The systemdoes not work and the

"OLP" intervenes interrupting deliveryto the motor-compressor.

No frost forms on the evaporator, even if the motor-compressoris apparentlyrunning regulary.

In case of short circuit, the breakdownis due to the electric winding. If blocked,there is a mechanicalfailure in the motorcompressor.

The motor-compressormust be replacedand then proceed with refilling.

In this case there is a mechanical failure in the diaphramvalveswhich remainingcontinuallyopen, do not permit the compressorto operate.

Consequentely,Freon®does not circulatein the system.

The motor-comprossormust be replacedand then proceed with refilling.

In case of mechanicalfailure in the motor-compressorthere in an excessive noisewhenthe system is functioning. In case a suspension spring is unhooked,bangingwill be heard and there will be especially strong vibrations when the system starts up and stops.

The causeof the excessivenoise is normally to be soughtfor in a mechanicalbreakdown,andonly rarely in the unhookingof one of the suspensionsprings.

The motor-compressormust be replacedand then proceed with the refilling.

-8-

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 if the current flows at the main coil of the Comprossor,

Coil shorted

Replace the

Compressor,

Poor running of the

Compressor.

Poor contacting point and broken

Replace the device.

-9-

COMPRESSOR AND ANOTHER ELECTRIC COMPONENTS

YES

Check the starting state.

YES

NO

NO

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.

YES

OLP works within 30 sec.

in forcible OLP operation byturning instant power on _ NO a o,.

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 a muititester or

Wheatstone Bridge,

___

___

4D

Separate the OLP from the Compressor and check resistance value between two terminals of

OLP with Tester.

©

÷ m

-11 -

÷ electric

6. EXPLODED VIEW

%

&

NOTE : Parts are subject to change in different localities.

-12-

I

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