LG GR-151CN Owner's manual

LG GR-151CN 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 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

CHARGE TUBE FEMALE

EXTENSION HANSEN

SERVICE TUBE

EXTENSION

Figure

1

MALE

HANSEN

SOLDERING

POINT

Figure

2 Figure 3

PRES;

GAUGE

Figure

4

-3-

If case that a considerable leakage occurs, it will be necessary to stop the vacuum pump 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 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 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)

_

SYSTEM

FILLING OR

CHARGE TUBE

TO THE

REFRIGERATION

TO THE

VACUUM

PUMP

VALVE TO BE

REFILLING

OPENED WHEN

TO THE

CHARGE

CYLINDER

VALVE TO BE

CLOSED

AFTER VACUUM

TO THE

R-134a CYLINDER

TO THE

REFRIGERATION

SYSTEM

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

1-1 GR-151

ITEMS

DOOR TYPE

NET CAPACITY

CONDENSER TYPE

DEFROSTING SYSTEM

TEMPERATURE CONTROL

INSULATION DOOR

CABINET

SPECIFICATIONS

1 DOOR

4.42ft 3

WALL CONDENSER

(FLUSH BACK)

MANUAL

KNOB DIAL

POLYURETHANE

POLYURETHANE

ITEMS

EVAPORATOR

DIMENSION (W X H X D)

NET WEIGHT

REFRIGERANT

LUBRICANT NS Series

COMPRESSOR

SPECIFICATIONS

ROLL BOND TYPE

19 X 331/2X 215/8 in

66.14 Ib

R-134a (3.35 oz)

HTS-150 FREOL c_22G

(180 cc) (180 cc)

2. PARTS IDENTIFICATION

EVAPORATOR (Inside Door)

- The heart of the refrigerator.

- It evaporates the refrigerant fluid and thereby absorbs heat from the interier.

ICE CUBE TRAY

Ice cubes 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.

GLASS LID & VEGETABLECONTAINER

_\\

\\

\\

\

NOTE : This is a basic model. The shape of refrigerator is subject to change.

-5-

J

__THERMOSTAT

Regulates the operation of the motor and controls the temperature inside the refrigerator.

Keeps bottles, cans, or jars.

=RTER

Keeps any kinds of bottles.

GASKET

Tight fitting door seal keeps all the cooling power locked inside.

No hooks or latches.

BAR

Keeps cans.

3. 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)

3. Pull off Knob Dial. (Figure 8)

4. Pull out thermostat in the thermostat cover, and disconnect lead wires. (Figure 10)

NOTE : Replace a proper specification new thermostat.

Figure 7

B. THERMOSTAT

1. Seperator feeler of thermostat from evaporator.

2. Loosen I screw holding the case to remove the

Thermostat cover. (Figure 9)

Figure 10

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 8 Figure 9

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 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-

4. CIRCUIT DIAGRAM

CIRCUIT DIAGRAM

"_'IERMOSTAT

BK

GN(GNHL) c= m

BK

YL :YELLOW

BK:BLACK

BL :BLUE

GN:GREEN

PK: PINK

BL

THE PLUG TYPE ON CIRCUIT DIAGRAM IS SUBJECT

TO CHANGE IN DIFFERENT LOCAL'nES.

B854JD1009E

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

-7-

TROUBLESHOOTING

DEFECT

SYSTEM

PARTIALLY OR

COMPLETELY OUT

OF REFRIGERANT

CHARGE

EFFECT

Evaporatordoesnot frost even though motor-compressorruns continually.

CAUSE

An empty refrigerantsystem

indicatesa leakage d 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 eliminatedby resolderingthe defective pointor substitutingthe damaged evaporator.

EXCESSIVELY

FULL

HUMIDITY IN THE

SYSTEM

This defect is indicatedby the presence of water outside the refrigerator near the motor caused by formationsof ice on the return tube.

If in the refrigerantsystema quantity of R134a is introducedwhich is greaterthan 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 continua{defrosting cycles 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 exit in 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

Poorperformanced 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 thefilling phase vacuum is not effectedor it is not adequatelydone.

Group must be drained and subsequentlyrefilled after carefully creatingvacuum.

Becaused the lack d 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 [email protected] 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.

Consequenteiy,Freon®does not circulatein the system.

The motoFcomprossormust be replacedand then proceed with refilling.

In case of mechanicalfailure in the motor-compressorthere in an excessive noise when the 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 sought for in a mechanicalbreakdown,and only 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.

___

--'_ flows at the contacting point of the Thermostat.

Check if the current _

Poor contacting point

H

Thermostat.

Replace the

--')' flowing of starting

_._

Broken

Shorted or

--'_ flows at the main coil of

H

Coil shorted

.__

Check the components

Replace the device.

H

_[

Replace the

Compressor.

Replace the components.

Poor running of the

Compressor.

____.._

Measure the starting

_._

Low voltage _[ Increase the voltage.

at the contacting point of the starting system,

Check if the current flows _

Poor contacting point and broken

_[

Replace the device.

Compressor runs.

_1

Check if the current flows I

_

.I

Shorted

] .I

Replace the

Compressor.

sthec r enta ounto,

normal?

worn out.

Repair the

Compressor.

Evaporator when operating set for more than 30 rain.

___

Poor compressing.

Refrigerant leaks.

H

-9-

[_

COMPRESSOR AND ANOTHER ELECTRIC COMPONENTS

Power Source H

Separate the PTC-STARTER from

the Compressor and measure the voltage between M and C of the

Compressor.

voltage, (Rating voltage + 10%)

Equal to the applied

The applied voltage is not in the range of Rating Voltage + 10%.

H to use in the

Check the resistance of the

Compressor Motor. H

M-C, S-C, and M-S.

Test the resistance among

[_

Replace the Compressor.

i [

Check the resistance of the

I

_1

I Test the resistance terminals of the both in the PTC-STARTER,

NO

D>

Check OLR

H

YES

Replace the

PTC-STARTER.

in forcible OLP operation by turning instant power on and off.

NO

,D>

--9>

YES .._

NO _ Replace OLR j,

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 min.

._

of 85% below.

Starts at the voltage

Normal.

Starts at the voltage of more than 90%.

state at the regular

--_

NO

Replace the PTC.

Normal.

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 multitester or

Wheatstone Bridge.

range of 15-28 for

_

Normal q

electric

-_ The value is 0.

H

Abnormal

•_ The value is _.

H

Abnormal

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

OLP with Tester.

YE_

--_ Replace OLR I o

÷ m

-11-

÷

5. EXPLODED VIEW

-12-

I

I

-13-

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