LG GA-B379UVQA User guide

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REFRIGERATOR

SERVICE MANUAL

CAUTION

BEFORE SERVICING THE UNIT, READ THE "SAFETY PRECAUTIONS" IN THIS MANUAL.

MODEL: GA-B409U*QA/B379U*QA

CONTENTS

-3-

SAFETY PRECAUTIONS .............................................................................................................................................. 2

SERVICING PRECAUTIONS ......................................................................................................................................... 3

SPECIFICATIONS ...........................................................................................................................................................4

PARTS IDENTIFICATION ...............................................................................................................................................6

REPLACEMENT OF DOOR OPENING TYPE ................................................................................................................8

DISASSEMBLY .............................................................................................................................................................. 9

DOOR.......................................... ................................................................................................................................ 9

DOOR SWITCH....................... .................................................................................................................................... 9

FAN AND FAN MOTOR..............................................................................................................................................10

DEF' CONTROL ASM ................................................................................................................................................10

LAMP........................................... ...............................................................................................................................10

ADJUSTMENT............................... ...............................................................................................................................11

COMPRESSOR.......................... ................................................................................................................................11

PTC-STARTER........................ ...................................................................................................................................11

OLP (OVER LOAD PROTECTOR) ... ........................................................................................................................ 12

CIRCUIT DIAGRAM.......... ........................................................................................................................................... 12

TROUBLESHOOTING........ ......................................................................................................................................... 13

COMPRESSOR AND ELECTRIC COMPONENTS ....................................................................................................13

PTC AND OLP........................... ................................................................................................................................ 14

ANOTHER ELECTRIC COMPONENT .........................................................................................................................15

SERVICE DIAGNOSIS CHART...... ........................................................................................................................... 16

REFRIGERATING CYCLE ........ ................................................................................................................................17

MICOM FUNCTION & PCB CIRCUIT EXPLANATION.................................................................................................20

EXPLODED VIEW ................... .....................................................................................................................................35

SERVICING PRECAUTIONS

Please read the following instructions before servicing your refrigerator.

1. Check the set for electric losses.

2. Unplug prior to servicing to prevent electric shock.

3. Whenever testing with power on, wear rubber gloves to prevent electric shock.

4. If you use any kind of appliance, check regular current, voltage and capacity.

5. Don't touch metal products in the freezer with wet hands. This may cause frostbite.

6. Prevent water from following to electric elements in the mechanical parts.

7. When standing up after having checked the lower section of the refrigerator with the upper door open, move with care to avoid hitting the upper door.

8. When tilting the set, remove any materials on the set, especially the thin plates(ex. Glass shelf or baskets).

9. When servicing the evaporator, wear cotton gloves. This is to prevent injuries from the sharp evaporator fins.

10. Leave the disassembly of the refrigerating cycle to a specialized service center. The gas inside the circuit may pollute the environment.

11. When you discharge the refrigerant, wear the protective safety glasses or goggle for eye safety.

12. When you repair the cycle system in refrigerator, the work area is well ventilated. Especially if the refrigerant is R600a, there are no fire or heat sources. (No smoking)

After the refrigerant (R600a) is completely discharged, repair any defective parts and replace the dryer. At any case you must use the LOKRING for connecting or replacing any part in the cycle (No Fire, No Welding). Connect the Schrader valve to pump with the coupler. And then turn the pump on for vacuum state (Figure 3). Let the pump run until the lowpressure gauge indicates the vacuum (gauge pressure 0, absolute pressure -1atm or -760mmHg). Recommended vacuum time is 30 min. Charge the N

gas in order to check for leakage from welding points and the LOKRING. If leakages are found, repair the defects and repeat the vacuum process.

After the system is completely vacuumed, fill it with the refrigerant R600a up to what has been specified at your refrigerator Name Plate. The amount of refrigerant (R600a) must be precisely measured within the error of ±2g by an electron scale (Figure 4).

If you use the manifold connected with both the refrigerant (R600a) cylinder and the vacuum pump simultaneously, make sure the pump valve is closed (Figure 5).

Connect the charging hose (that is connected to the refrigerant (R600a) cylinder) to the Schrader valve installed on the service tube. Then, charge the refrigerant (R600a) by controlling the Throttle valve. When you do so, do not fully open the Throttle valve because it may make damage to the compressor. Gradually charge the refrigerant (R600a) by changing open and close the Throttle Valve (5g at each time). The charging hose must use a one-way valve to prevent the refrigerant refluence. Close the Schrader valve cap after the refrigerant (R600a) is completely recharged.

After you completely recharge the refrigerant (R600a), perform the leakage test by using a portable leakage detector or soapy water. Test the low pressure (suction) parts in compressor off time and high pressure parts in compressor on time. If the leakages are found, restart from the refrigerant (R600a) discharging process and repairs defects of leaks.

After the leakage test, check the temperature of each parts of the cycle. Check with hands if the CONDENSER and the case (HOT-LINE pipe) that is contacted to the door gasket are warm. Confirm that frost is uniform distributed on the surface of the EVAPORATOR.

SERVICING PRECAUTIONS

--4-

WEIGH SCALE

THROTTLE VALVE

COUPLE

REFRIGERANT (R600a)

CHARGING HOSE

Features of refrigerant (R600a)

• Achromatic and odor less gas.

• Flammable gas and the ignition (explosion) at 494°C.

• Upper/lower explosion limit: 1.8%~8.4%/Vol.

Features of the R600a refrigerator

• Charging of 60% refrigerant compared with a R134a model

• The suction pressure is below 1bar (abs) during the operation.

• Because of its low suction pressure, the external air may flow in the cycle system when the refrigerant leak, and it causes malfunction in the compressor.

• The displacement of compressor using R600a must be at least

1.7 times larger than that of R134a.

• Any type of dryer is applicable (XH-5, 7, 9).

•

The EVAPORATOR or any other cycle part that has welding joint is hidden in the foam. (If not hidden inside, the whole electric parts must be tested with the LEAKAGE TEST according to the IEC Standard.)

• The compressor has label of the refrigerant R600a.

• Only the SVC man must have an access to the system.

Installation place

• Must be well ventilated.

• Must be 20 m

or larger.

• Must be no-smoking area.

• No ignitable factors must be present.

Utilities

• Refrigerant cylinder (MAX NET 300g)

• Manometer

• Vacuum pump (600l /min)

• Piercing Clamp

• Quick coupler

• Hoses (5m-1EA, 1m-3EA)

• LOKRING

• Portable Leakage detector (3g/year↓ )

• Nitrogen cylinder (for leakage test)

• Concentration gauge

Make sure before Servicing

• Refrigerant Confirm the refrigerant by checking Name Plate and the label on the compressor, after opening the COVER ASSY, BACK-M/C.

•

If the refrigerant is R600a, you must not weld or apply a heat source.

Air Recharging in Compressor

Before refilling the refrigerant, you must perform the test according to Chapter 5 (TROUBLESHOOTING CHART). When the defects are found, you must discharge the residual refrigerant (R600a) in the outdoor. For discharging the refrigerant R600a, break the narrow portion of tube extension by hand or with a pipe cutter as shown in Figure 1. Leave it for 30min in outside to stabilize the pressure with ambient. Then, check the pressure by piercing the dryer part with piercing pliers. If the refrigerant is not completely discharged, let the refrigerator alone for more 30min in outside.

Attach the service tube installed with a Schrader valve (one-way valve) by using the LOKRING (Figure 2). Then, connect the Schrader valve (one-way valve) to the pump that is connected to the discharging hose leading to the outside. When discharging the residual refrigerant, repeat 3 cycle that includes 3min of the pump running->pump off->30sec of the compressor running.

Figure 3

Figure 4

Figure 5

POINT TO BE BROKEN

CHARGE TUBE EXTENSION

SCHRADER VALVE (ONE-WAY VALVE)

LOKRING

SERVICE TUBE EXTENSION

Figure 1 Figure 2

TO THE VACUUM PUMP

PRESSURE GAUGE

FILLING OR CHARGE TUBE

TO THE REFRIGERATION SYSTEM

TO THE VACUUM PUMP

VALVE TO BE OPENED WHEN REFILLING

TO THE CHARGE CYLINDER

VALVE TO BE CLOSED AFTER VACUUM

SPECIFICATIONS

1.Ref. No: GA-B409U*QA

ITEMS SPECIFICATIONS

DIMENSIONS (mm) 595(W)X651(D)X1896(H)

NET WEIGHT (kg) 77

COOLING SYSTEM Fan Cooling

TEMPERATURE

CONTROL

DEFROSTING SYSTEM

DOOR FINISH

OUT CASE Painted Steel Sheet

INNER CASE ABS

INSULATION Polyurethane Foam

DEFROSTING DEVICE Heater, Sheath

REFRIGERANT R600a(60g)

LUBRICATION OIL FREOL S10(280 cc)

REFRIGERATOR Knob Dial

FREEZER Button

Full Automatic

Heater Defrost

Pre-Coated Metal or Vinyl Coated Metal

ITEMS SPECIFICATIONS

Transparent Shelf(3 EA)

REFRIGERATOR

COMPARTMENT

DOOR POCKET

FREEZER

COMPARTMENT

COMPRESSOR PTC Starting Type

EVAPORATOR Fin Tube Type

CONDENSER Side & Wire Condenser

* Optional Parts

Vegetable Container(1 EA)

Vegetable Container Cover(1 EA)

Tray Meat (1 EA)*

Dairy Pocket Cover(2 EA)

Egg Tray(2 EA)

Little Pocket 4 or 6 EA

Bottle Pocket(1 EA)

Tray Drawer(3 EA)

Ice Tray(1 EA)

2.Ref. No: GA-B379U*QA

ITEMS SPECIFICATIONS

DIMENSIONS (mm) 595(W)X651(D)X1726(H)

NET WEIGHT (kg) 69

COOLING SYSTEM Fan Cooling

TEMPERATURE

CONTROL

DEFROSTING SYSTEM

DOOR FINISH

OUT CASE Painted Steel Sheet

INNER CASE ABS

INSULATION Polyurethane Foam

DEFROSTING DEVICE Heater, Sheath

REFRIGERANT R600a(60g)

LUBRICATION OIL FREOL S10(280 cc)

REFRIGERATOR Knob Dial

FREEZER Button

Full Automatic

Heater Defrost

Pre-Coated Metal or Vinyl Coated Metal

ITEMS SPECIFICATIONS

Transparent Shelf(2 EA)

REFRIGERATOR

COMPARTMENT

DOOR POCKET

FREEZER

COMPARTMENT

COMPRESSOR PTC Starting Type

EVAPORATOR Fin Tube Type

CONDENSER Side & Wire Condenser

* Optional Parts

Vegetable Container(1 EA)

Vegetable Container Cover(1 EA)

Egg Tray(2EA)

Little Pocket (4 EA)

Bottle Pocket(1 EA)

Tray Drawer(3 EA)

Ice Tray(1 EA)

-5-

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

PARTS IDENTIFICATION

-6-

Door Swich

Utility Corner (movable)

Removable

Glass Shelf(2 or 3)

Lamp

Multi-air Flow Duct

Tray Meat (Optional)

Refrigerator

Temperature

Vegetable Drawer

Used to keep fruits

and vegetables, etc.

fresh and crisp.

Ice Cube Tray

Compartment

Control

Freezer

Rotatable Door Basket (3 or 5)

Egg Tray

Handle

Bottle

Door Basket

Removable

Plinth

Leveling Screw

REPLACEMENT OF DOOR OPENING TYPE

Precaution

Before reversing the door, first of all, you should take out food and accessories like shelves or trays which arenot fixed in the fridge-freezer.

Use Torque Wrench or Spanner to fix or remove the bolt.

Do not lay the fridge-freezer down. This will cause problems.

Be careful not to drop the doors in disassembling or assembling.

How to Reverse the Door

1. Separate the screw after separating the nut on the

left of the refrigerator door handle , then separate the refrigerator door handle . Separate the freezer door

handle in the order in which you separating the refrigerator door handle . (The hidden handle does not need this

procedure)

4. Remove two small caps on the front of the cover front

with a screw driver, then separate the screw and . Separate the cover front . Move the wire to left, install the cover front and the screw. Take the small caps out of the alternate

2 3

bag, then install the small caps.

Note: It’s unnecessory to change door switch wire .

2. Separate the screw and bottom cover , then separate

the cap of bottom cover and install it on the

corresponding position on the right side. Separate the hinge lower right and the pin after separating the screw . Install the bolt into the corresponding left hole

on the hinge lower. Separate the freezer door , then remove the CAP on the door and install it on the

corresponding position on the right side. Separate the door

stop after your separating the screw , then install the

door stop on the corresponding position on the left.

3. Separate the cover of hinge upper , separate the two

wire . Separate the screw , separate the hinge middle , then separate the refrigerator door .Separate cap

1 8

and install it on the corresponding position on the right. Separate the door stop after your separating the screw

2 1

, then install the door stop on the corresponding position on the left. Separate the screw , then separate the hinge upper right (Hinge Upper) .

Note: Reversing the doors is not covered by the warranty.

Remove the small cap of the refrigerator door , then

separate the small cap . Move the cable from left to the

corresponding position on the right. Install the small cap , then install the small cap on the corresponding position on

the right.

Install the hinge lower and the freezer door , then install

the hinge middle . Separate the cap on the freezer. Install

10 11

the freezer door, take the hinge upper out of the alternate

bag and install it on upper left. Pull out the wire from the

26 29

individual holes and connect these cables. Take the small caps

3 1

3 2

out of the alternate bag, then install the small caps. Install base cover .

7. Separate the cap on the right side of the door, then install it

into the left screw hole (you can see this hole after the left handle

is removed). Install the handle and the screw which previously separated on the corresponding position on the right. (The hidden handle does not need this procedure) Then Installation completed.

-7-

DISASSEMBLY

Bolt

Lower Hinge

Figure 6

1. DOOR

•

Freezer Door

1) Loosen 2 screws and pull the Cover Lower.

2) Loosen hexagonal bolts fixing the lower hinge to the body to remove the freezer door only.

3) Pull out the Door Gasket to remove from the Door Foam Assy, F.

GASKET

2. DOOR SWITCH

1) Using the driver remove two small cap of the front.

2) Loosen four screws in upper part and disconnect top cover.

3) Disconnect Lead Wire from switch.

4) Disengage hook behind the switch by pressing it with hands.

Figure 9

3. REFRIGERATOR ROOM LAMP

1) Remove the Cover Lamp, R by pulling with a '–' type driver.

2) Remove the Lamp by turning.

Figure 7

•

Refrigerator Door

1) Loosen hexagonal bolts fixing the center hinge(Hinge,C) to the body to remove the refrigerator door only.

Hinge, C

Bolt

2) Pull out the Door Gasket to remove from the Door Foam Assy, R.

Figure 8

Figure 10

3) After removing the lamp, you must check the O-RING, which is made by rubber and prevent electric spark, in the socket.

4. DISPLAY

Tear the PC SHEET on the cover of the display.(OPTION)

2)Pry the display’s cover from the gap between the display and display cover by using a (-) screw driver. Then pull out the display circuit board to replace.

-8-

4 F AN AND F AN M O T OR

REFRIGERATOR ROOM LAMP

1) Rem o v e free z er d r a w er s .

2) Rem o v e t w o ca p , scr e ws and loosen t w o scr e ws in G r ille F an.

3) Pull out the G r ille F an and Shroud, F .

4) Disconnect the housing of lead wir

5) Sepa r ate the F an Ass y .

6) Losse 2 scr e w fi x ed to the B r ack et.

7) Pull out Shroud, F rem o v e the F an Motor Ass y .

8) Sepa r ate the Motor B r ack et and Ru b be r .

SHROUD

e .

FAN MOTOR

6 D AMPER CONT R OL

1) Rem o v e the C o v er Lam p , R and loosen 2 scr e w .

2) Pull the Control B o x, R and sepa r ate the lead wire housing.

3) Rem o v e the C o v er Lam p , R.

4) Sepa r ate the Insulation Multi Duct and Control B o x, R.

5) Disassem b le the Kno b .

GUIDE FAN

GRILLE

FAN

Figure 11

5 DEF R OST CONT R OL ASSY

Defrost Control Assy consists of The r mistor and Fus e , Melting. The r mistor functions to defrost automatically and it is attached to metal side of the E

Fus e , Melting is a kind of sa f ety d e vice f or pr e v enting o v erheating of the Heater when defrosting.

At the tempe r ature of 7 7 ° C , it stops the emission of heat from the Heate

r .

1) Pull out the Shroud, F after rem o ving the G r ill e .

2) Sepa r ate the connector connected with the Defrost Control Assy and replace n e w on e .

v apo r ator and senses tempe r atur e .

Thermister

Fuse, Melting

Figure 13

7 HE A TER, SHE A TH

In this ref r ige r ato r , Heate r , Sheath is heate r . Du r ing heating, the tempe r ature about 300~350° C . There f or e , be careful not

while se r vicing.

1) After rem o ving the G r ille and Shroud, sepa r ate the Heate r , Sheath b y disconnecting the connector s .

2) Exchanged Heate r , Sheath and connected the housing.

used for defrosting

of heater rises

to burn

Figure 12

-9-

Heater, Sheath Heater, Sheath

Figure 14

ADJUSTMENT

-10-

1. COMPRESSOR

1) Role

The compressor intakes low temperature and low pressure gas evaporated from Evaporator of the Refrigerator, and condenses this gas to high temperature and high pressure gas, and then plays delivering role to Condenser.

2) Composition

The Compressor is composed of Compressor Apparatus compressing gas, Compressor Motor moving Compressor Apparatus and Case which protecting Compressor Apparatus and Motor. There are PTC-Starter, and Over Load Protector (OLP) in the Compressor outside. On the other hand, because the Compressor consists of 1/1000mm processing precision components and is sealed after production in absence of dust or humidity, deal and repair with care.

3) Note for Usage

(1) Be careful not to allow over-voltage and over current. (2) No Strike

If applying forcible power or strike (dropping or careless dealing), poor operation and noise may occur

(3) Use proper electric components appropriate to the

Compressor.

(4) Note to Keep Compressor.

If Compressor gets wet in the rain and rust in the pin of Hermetic Terminal, the result may be poor operation and poor contact may cause.

(5) Be careful that dust, humidity, and flux welding don't

inflow in the Compressor inside in replacing the Compressor. Dust, humidity, and flux due to welding which inflows to Cylinder may cause lockage and noise.

2. PTC-STARTER

1) Composition of PTC-Starter

(1) PTC (Positive Temperature Coefficient) is a no-contact

semiconductor starting device which uses ceramic material and this material consists of BaTiO3.

(2) The higher the temperature is, the higher becomes the

resistance value. These features are used as starting device for the Motor.

2) Role of PTC-Starter

(1) PTC is attached to Hermetic Compressor used for

Refrigerator, Show Case and starts Motor.

(2) Compressor for household refrigerator applies to

single-phase induction Motor. For normal operation of the single-phase induction motor, in the starting operation current flows in both main coil and sub-coil. After the starting is over, the current in subcoil is cut off. The proper features of PTC play all the above roles. So, PTC is used as a motor starting device.

3) PTC-Applied Circuit Diagram

According to Starting Method for the Motor

4) Motor Restarting and PTC Cooling

(1) For restarting after power off during normal

Compressor Motor operation, plug the power cord after 5 min. for pressure balance of Refrigerating Cycle and PTC cooling.

(2) During normal operation of the Compressor Motor,

PTC elements generate heat continuously. Therefore, if PTC isn't cooled for a while after the power has been shut off, Motor can't operate again.

5) Relation of PTC-Starter and OLP

(1)

If the power is off during operation of Compressor and the power is on before the PTC is cooled, (instant shut- off within 2 min. or reconnect a power plug due to misconnecting), the PTC isn't cooled and a resistance value grows. As a result, current can't flow to the sub- coil and the Motor can't operate and the OLP operates by flowing over current only in the main-coil.

(2)

While the OLP repeats on and off operation about 3-5 times, PTC is cooled and Compressor Motor performs normal operation. If OLP doesn't operate when PTC is not cooled, Compressor Motor is worn away and causes circuit short and fire. Therefore, use a properly fixed OLP without fail.

6) Note to Use PTC-Starter

(1) Be careful not to allow over-voltage and over-current. (2) No Strike

Don't apply a forcible power or strike.

(3) Keep apart from any liquid.

If liquid such as oil or water get to the PTC, PTC materials may break due to insulation breakdown of the material itself.

(4) Don't change PTC at your convenience.

Don't disassemble PTC and mold. If the exterior to the PTC-starter is damaged, resistance value is altered and it may cause poor starting of the compressor motor.

(5) Use a properly fixed PTC.

PTC STARTER

HERMETIC

TERMINAL

COMPRESSOR MOTOR

PTC

OVERLOAD

PROTECTOR(O.L.P)

RSIR

RELAY ASSY

Figure 19

CIRCUIT DIAGRAM

-11-

3. OLP (OVER LOAD PROTECTOR)

1) Definition of OLP

(1) OLP (OVER LOAD PROTECTOR) is attached to the

Hermetic Compressor and protects the Motor by cutting off current in Compressor Motor in case of over-rising temperature by Bimetal in the OLP.

(2) When over-voltage flows to Compressor motor, the

Bimetal works by heating the heater inside the OLP, and the OLP protects Motor by cutting off current which flows to the Compressor Motor.

2) Role of the OLP

(1) The OLP is attached to the Hermetic Compressor

used for the Refrigerator and Show Case and prevents the Motor Coil from being started in the Compressor.

(2)

Do not turn the Adjust Screw of the OLP in any way for

normal operation of the OLP.(Composition and connection Diagram of OLP)

CONTACTING POINT

COVER

BIMETAL

CONTACTING POINT

HEATER

TERMINALS

ADJUST SCREW

HEATER

BIMETAL

Figure 20

NOTE : 1. This is a basic diagram and specifications vary in different localities.

3854JS8003X

TROUBLESHOOTING (Mechanical Part)

-12-

1. COMPRESSOR AND ELECTRIC COMPONENTS

4 3

YES

Power Source.

Remove the Relay Assy from the Compressor and measure the voltage between T erminal C of Compressor and T erminals M or S of Relay Assy

No V oltage.

(Rating V oltage ±10%)

±10%)

Replace Relay Assy

O.K.

Advise the customer to use a regular T rans.

Replace Compresso r .

OLP works within 30 sec. in forcible OLP operation by turning instant power on and o f f.

Components start in the voltage of Rating V oltage ±

Applied voltage isn't in the range of Rating Voltage

Check the resistance among M-C, S-C and M-S in Motor Compressor.

Check the resistance of two terminals in PTCStarte r .

Check if applying a regular OL P .

Measure minimum starting voltage after 5 min. for balancing cycle pressure and cooling the PTC.

Check the resistance of Motor Compresso r .

Check the resistance of PTC-Starte r .

Check OL P .

Check starting state.

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LG GA-B379UVQA User guide

Specifications and Main Features

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User Manual