Daewoo FRN-U20IE, FRN-U20BE, FRN-U20GE, FRS-U20IE, FRS-U20BE Service Manual

Refrigerator

S/M No: FRSU20IA01

July . 2005

4

Caution

: In this Manual, some parts can be changed for improving, their
performance without notice in the parts list. So, if you need the
latest parts information,please refer to PPL(Parts Price List) in
Service Information Center

1

C O N T E N T S

1. WARNINGS AND PRECAUTIONS FOR SAFETY --------------------------------------------

2. EXTERNAN VIEW

2-1. External Size ----------------------------------------------------------------------------------------­2-2. Name of Each Parts ---------------------------------------------------------------------------------

3. SPECIFICATION ---------------------------------------------------------------------------------------

4. OPERATION AND FUNCTIONS -------------------------------------------------------------------

5. CIRCUIT OPERATION

5-1. Power Circuit Diagram ----------------------------------------------------------------------------­5-2. Function of Each Sensor -------------------------------------------------------------------------­5-3. Relay Function --------------------------------------------------------------------------------------­5-4. Fan Function -----------------------------------------------------------------------------------------

6. DIAGRAM

6-1. Wiring Diagram --------------------------------------------------------------------------------------­6-2. Circuit Diagram of Main PCB ---------------------------------------------------------------------

7. COMPONENT LOCATE VIEW ---------------------------------------------------------------------

8. HOW TO CHECK EACH PARTS

8-1. Hose Ice Maker Tube ------------------------------------------------------------------------------­8-2. Bracket Geared Motor -----------------------------------------------------------------------------­8-3. Dispenser Micro Switch ---------------------------------------------------------------------------­8-4. Dispenser Solenoid Valve ------------------------------------------------------------------------­8-5. Main PCB ---------------------------------------------------------------------------------------------­8-6. Ice Maker ----------------------------------------------------------------------------------------------

9. TROUBLE DIAGNOSIS

9-1. Power Failure ----------------------------------------------------------------------------------------­9-2. Freezer Compartment -----------------------------------------------------------------------------­9-3. Refrigerator Compartment ------------------------------------------------------------------------­9-4. Operation Noise of Refrigerator -----------------------------------------------------------------­9-5. Door -----------------------------------------------------------------------------------------------------

10. COOLING CYCLE HEAVY REPAIR

10-1. Summary of Heavy Repair ----------------------------------------------------------------------­10-2. Precaution during Heavy Repair --------------------------------------------------------------­10-3. Practical Work for Heavy Repair --------------------------------------------------------------­10-4. Standard Regulations for Heavy Repair -----------------------------------------------------­10-5. Brazing Reference Drawing ---------------------------------------------------------------------

11. INSTALLATION GUIDE

11-1. Installation Preparation --------------------------------------------------------------------------­11-2. If the Refrigerator can not enter the Door ---------------------------------------------------­11-3. Refrigerator Leveling & Door Adjustment ---------------------------------------------------­11-4. Water Line Installation ---------------------------------------------------------------------------­11-5. Dispenser Water Flow ----------------------------------------------------------------------------

12. EXPLODED VIEW & PARTS LIST

12-1. FRS(N)-U20IA -------------------------------------------------------------------------------------­12-2. FRS(N)-U20DA ------------------------------------------------------------------------------------­12-3. FRS(N)-U20EA ------------------------------------------------------------------------------------­12-4. FRS(N)-U20FA ------------------------------------------------------------------------------------­12-4. FRS(N)-U20GA -------------------------------------------------------------------------------------

2

3
6

11

14

34
35
37
39

40

42

46

48
49
50
51
52
53

56
57
63
67
74

75
76
77
79
80

81
82
84
85
87

88

98
109
120
131

2

Please observe the following safety precautions in order to use safely and correctly the refrigerator

and to prevent accident and danger during repair.

1. Be care of an electric shock. Disconnect power cord from wall outlet and wait for more than
three minutes before replacing PCB parts.

Shut off the power whenever replacing and repairing electric components.

2. When connecting power cord, please wait for more than five minutes after power cord was
disconnected from the wall outlet.

3. Please check if the power plug is pressed down by the refrigerator against the wall.

If the power plug was damaged, it may cause fire or electric shock.

4. If the wall outlet is over loaded, it may cause fire.

Please use its own individual electrical outlet for the refrigerator.

5. Please make sure the outlet is properly earthed, particularly in wet or damp area.

6. Use standard electrical components when replacing them.

7. Make sure the hook is correctly engaged.

Remove dust and foreign materials from the housing and connecting parts.

8. Do not fray, damage, machine, heavily bend, pull out or twist the power cord.

9. Please check the evidence of moisture intrusion in the electrical components.

Replace the parts or mask it with insulation tapes if moisture intrusion was confirmed.

10. Do not touch the icemaker with hands or tools to confirm the operation of geared motor.

11. Do not let the customers repair, disassemble and reconstruct the refrigerator for themselves.

It may cause accident, electric shock, or fire.

12. Do not store flammable materials such as ether, benzene, alcohol, chemicals, gas, or

medicine in the refrigerator.

13. Do not put flower vase, cup, cosmetics, chemicals, etc., or container with full of water

on the top of the refrigerator.

14. Do not put glass bottles with full of water into the freezer.
The contents shall freeze and break the glass bottles.

15. When you scrap the refrigerator, please disconnect the door gasket first and scrap it

where children are not accessible.

1. WARNINGS AND PRECAUTIONS FOR SAFETY

3

2. EXTERNAL VIEWS

2-1. External Size

■ FRS(N)-U20IA

4

■ FRS(N)-U20DA / FRS(N)-U20EA

5

■ FRS(N)-U20FA / FRS(N)-U20GA

6

12. Refrigerator case

11. Refrigerator pocket

10. Movable Egg case5. Freezer case

9. Refrigerator shelf4. Freezer shelf

8. Chilled case3. Ice tray

7. Refrigerator light2. Freezer pocket

6. Dairy pocket1. Freezer light

Refrigerator Compartment

Freezer Compartment

2-2. Name of Each Parts

■ FRS(N)-U20IA

1

2

4

3

5

7

8

9

10

11

6

12

7

7. Dairy pocket1. Ice cubes storage case

12. Refrigerator case6. Freezer case

11. Refrigerator pocket5. Freezer pocket

10. Movable egg case4. Freezer shelf

9. Refrigerator shelf3. Water/Ice dispenser

8. Refrigerator light2. Freezer light

Refrigerator Compartment

Freezer Compartment

■ FRS(N)-U20DA

8

9

10

11

12

7

1

2

4

3

5

6

8

■ FRS(N)-U20EA

8

10

11

13

14

7

1

2

4

3

5

6

9

12

13. Refrigerator pocket

12. Refrigerator case6. Freezer case

7. Dairy pocket1. Ice cubes storage case

14. Magic cool zone

11. Movable egg case5. Freezer pocket

10. Refrigerator shelf4. Freezer shelf

9. Shelf wine (option)3. Water/Ice dispenser

8. Refrigerator light2. Freezer light

Refrigerator Compartment

Freezer Compartment

9

12. Refrigerator pocket6. Freezer case

7. Dairy pocket1. Ice cubes storage case

13. Refrigerator case

11. Movable egg case5. Freezer pocket

10. Homebar pocket4. Freezer shelf

9. Refrigerator shelf3. Water/Ice dispenser

8. Refrigerator light2. Freezer light

Refrigerator Compartment

Freezer Compartment

■ FRS(N)-U20FA

8

9

11

12

13

7

1

2

4

3

5

6

10

10

■ FRS(N)-U20GA

8

9

11

12

15

7

1

2

4

3

5

6

10

13. Refrigerator pocket

14. Refrigerator case

12. Movable egg case6. Freezer case

7. Dairy pocket1. Ice cubes storage case

15. Magic cool zone

11. Homebar pocket5. Freezer pocket

10. Refrigerator shelf4. Freezer shelf

9. Shelf wine (option)3. Water/Ice dispenser

8. Refrigerator light2. Freezer light

Refrigerator Compartment

Freezer Compartment

13

14

11

3. SPECIFICATION

3-1. Specification

117kg115kg113kg 115kg

330 Li

170 Li

500 Li

352 Li

184 Li

536 Li

FRS(N)-

U20GA

334 Li

170 Li

504 Li

357 Li

184 Li

541Li

FRS(N)-

U20FA

334 Li

170 Li

504 Li

357 Li

184 Li

541 Li

FRS(N)-

U20DA

C
Y
C
L
E

IDΦ0.7 × T0.55 × L2200Capillary Tube

Molecular Sieve XH-9Dryer

Fan Cooling SystemCondenser

Fin TypeEvaporator

525 Li570 LiTotal

ISO Gross

Volume

(Li)

178 Li209 LiFreezer

337 Li361 LiRefrigerator

903 mm x 734.5mm x 1790 mm

104kg

339 Li

198 Li

537 Li

FRS(N)-

U20IA

External Dimension

(Width x Depth x Height)

Weight

334 LiRefrigerator

170 LiFreezer

504 LiTotal

ISO Storage

Volume

(Li)

FRS(N)-

U20EA

Model Name

SpecificationItem

R-600a (76g)R-134a (190g)R-134a (190g)Refrigerant ( g )

39561452503956183D50395S130R50Part Code

MK4A5Q-R1U

3011402100

265RHB, S330

MK183Q-L2UHPL30YG-5Description

Compressor

3018129810

308NHB, S330

Part Code

Description

SWITCH

P RELAY AS

3011347400

CP-2PIN

(Other Country)

301130108030113473003011346700Part Code

KP-550

(AUSTRALIA)

BS-1363

CP-2PIN

(EUROPE)

Description

CORD POWER AS

12

※ ( ) is the specification for the model which use R-600a(refrigerant)

AC220V / 10W

AC220V / 5W

-

Water Pipe Heater

SP201R-7DL / SP201R-7DR

(SPF101B-2D / SPF101B-1D)

Door Switch , F / R

AC230~240V / 25W (2EA)R-Lamp

AC230~240V / 25W (2EA)F-Lamp

DC13V / 1100±100 rpmCondenser Fan Motor

DC13V / 1850±100 rpm R-Fan Motor

DC13V / 2050±100 rpmF-Fan Motor

AC250V , 10A , 77

℃

Fuse Temp (Defrost)

AC250V 12AMain Fuse (Power cord)

P
A
R
T
S

E
L

E
C
T
R

I
C
A

L

-Homebar Heater

AC220V / 5W-Dispenser Heater

AC220V / 8WLouver Heater

AC220V / 7WMain Duct Heater

AC220V / 192WDefrost Heater

H

E
A
T
E

R

PBN-43R-Sensor

PBN-38F-Sensor

PBN-43D-SensorS

E

N

S
O
R

FRS(N)-

U20GA

FRS(N)-

U20FA

FRS(N)-

U20EA

FRS(N)-

U20DA

FRS(N)-

U20IA

Model Name

SpecificationItem

FRN-U20GAFRN-U20FAFRN-U20EAFRN-U20DAFRN-U20IAR-600a

FRS-U20GAFRS-U20FAFRS-U20EAFRS-U20DAFRS-U20IAR-134a

Model NameRefrigerant

13

4-1. Display

54

321Temp indication

Max

Medium

Max

Mid

Medium

Min

MinTemperature Chang

54

321Temp indication

Max

Medium

Max

Mid

Medium

Min

MinTemperature Change

1. “FRZ.TEMP” Button

1) Temperature control of Freezer compartment

2) 5 step mode of successive temperature mode.

3) Initial mode by power input : “3”

※Whenever pressing button, setting is repeated in the order of

Medium(3) → Medium Max(4) → Max(5) → Min(1) → Medium Min(2).

2. “REF.TEMP” button.

1) Temperature control of Refrigerator compartment

2) 5 step mode of successive temperature mode.

3) Initial mode by power input : “3”

※Whenever pressing button, setting is repeated in the order of

Medium(3) → Medium Max(4) → Max(5) → Min(1) → Medium Min(2).

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

FRZ.TEMP, REF.TEMP Inner Control (Lamp-LED)

4-1-1. FRS(N)-U20IA

※ The actual inner temperature varies depending on the food status, as the indicated setting

temperature is a target temperature, not actual temperature within refrigerator.

※ Refrigeration function is weak in the initial time.

Please adjust temperature as above after using refrigerator for minimum2~3 days.

Temperature adjustment button
for refrigerator compartment.

Temperature adjustment button
for freezer compartment.

4. OPERATION AND FUNCTIONS

14

1. Display control

2. “FREEZER SET” Button

1) Temperature control of freezer compartment

2) 7 step mode of successive temperature mode.

3) Initial mode by power input : “Medium(-19℃)”

※Whenever pressing button, setting is repeated in the order of

Medium (-19℃) → Medium Max 1 (-20℃) → Medium Max 2 (-21℃) → Max (-22℃)

→ Min (-16℃) → Medium Min 2 (-17℃) → Medium Min 2 (-18℃).

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

Front PCB button
FREEZER SET, REFRIGERATOR SET
SUPER FREEZER, SUPER REFRIGERATOR
RESET FILTER, WATER / ICE, ICE MAKER LOCK
,LOCK

FCP C-LED

3. “SUPER FREEZER” Button
When this mode is chosen, the icon (FREEZER QUICK) is ON.

After six month, LED ONFILTER CHANGE ICON

DialICE MAKER LOCK ICON

DialLOCK ICON

DialWATER / CUBED ICE/ CRUSHED ICE ICON

Always ONFUZZY, DEODORIZER ICON

Dial

SUPER FREEZER,SUPER

REFRIGERATOR ICON

Initial mode : Freezer & Refrigerator set→

Medium (-19℃/4℃)

88 DISPLAY (SET TEMP.)

ControlFCP-LED

-21℃

Medium

Max 2

-18℃

Medium

Min 2

-19℃

Medium

-22℃

Max

-20℃-17℃-16℃

Temp

indication

Medium

Max 1

Medium

Min 1

Min

Temperature

Change

4-1-2. FRS(N)-U20DA / EA / FA / GA

Temperature adjustment button
for freezer compartment.

Super freezer

Temperature adjustment button

for refrigerator compartment.

Super Refrigerator

Lock button

Water filter reset

Dispenser select button

Ice maker lock button

Letters are indicated on 88 Display LED

15

CONTENTS

REMARKS

4. “REFRIGERATOR SET” button.

1) Temperature control of Refrigerator compartment

2) 5 step mode of successive temperature mode.

3) Initial mode by power input : “Medium (4℃)”
※Whenever pressing button, setting is repeated in the order of

Medium (4℃) → Medium Max (3℃) → Max (2℃) → Min (6℃) → Medium Min (5℃).

2℃3℃

4℃5℃6℃Temp indication

Max

Medium

Max

Mid

Medium

Min

MinTemperature Change

5. “SUPER REFRIGERATOR” button.
When this mode is chosen, the icon (REFRIGERATOR QUICK) is ON.

6. “WATER / ICE” button

1) Select Water / Cubed Ice / Crushed Ice.

2) Icon lights up to show your selection is on.
Initial mode by power input : “Water” mode.

3) The mode of Cubed Ice or Crushed Ice continues for 1 hour and then changes
to Water. (Water icon turns ON)

7. “ICE MAKER LOCK” button

1) Start by pushing “ICE MAKER LOCK” button

① “ICE MAKER LOCK” icon is on
② “WATER” icon is always on

2) Stop by pushing “ICE MAKER LOCK” button again

① “ICE MAKER LOCK” icon is off
② “WATER” icon is on

8. “RESET WATER FILTER” button

1) The normal (ICON OFF) is on for 6 month after are first power input.

2) After sic months, icon is ON.

3) How to reset Filter information
① Push the “RESET WATER FILTER” button for 3 seconds after change.

9. “LOCK” button

1) This button stops operation of different button.

① “LOCK” icon is on
② Press this button to lock out this case and to keep temperature and

function setting.

2) Push “LOCK” button again for more than a second to stop it.

※ The actual inner temperature varies depending on the food status, as the indicated setting

temperature is a target temperature, not actual temperature within refrigerator.

※ Refrigeration function is weak in the initial time.

Please adjust temperature as above after using refrigerator for minimum2~3 days.

Letters are indicated on 88 Display LED

REFERENCE : Please wait
for 2-3 seconds in order
to take final ice or drops
of water when taking out
cup from the pressing
switches after taking ice
or water.

16

1. Defrost Mode

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

1. Defrosting Cycle

1. Comp

2. F-Fan

3. R-Fan

4. D-Heater

Pre-Cool

Pause

Fan-Delay

Heater

Defrosting

Pre-Cool

1) Time : 50 minutes

2) Comp , F-fan : ON
R-fan : Control

D-HTR : OFF

3) If F-sensor ≤ -27℃, then Pre-Cool becomes. OFF

Heater
Defrosting

1) Comp, F-fan, R-fan : OFF

D-HTR : ON

2) Time limit

30 seconds : Heater is ON regardless of D-sensor

temperature right after defrosting start
30 minutes : in case of D1- Error
80 minutes : in normal control state

3) If D-sensor ≥13℃, Heater Defrosting is OFF

Pause

Time : 7 minutes
Comp, F-fan, R-fan, Heater etc. : OFF

Fan-Delay

1) Time : 5 minutes
Comp : ON and F-fan, R-fan, Heater : OFF

4-2. Defrost Mode

2.The defrost mode start with the following conditions

1) Total operation time of comp. becomes : 6,8,10,……… 24 hours.

① Comp. operating rate : more 85%
② Total door open time : 2 minutes

(Any door, F or R open time is over 2 minutes.)

③ Any error mode : R1, F1, D1, F3, RT/S, Door-switch etc.)

2) Defrosting mode starts unconditionally as long as total comp. work time is
24 hours, even if the above conditions 1) are not satisfied.

3) Defrosting mode starts immediately as long as total time of [comp. ON +
comp. OFF] is over 60 hours, even if the above 1) and 2) conditions are not
satisfied.

3. In providing initial power (or returning power failure)

If D-sensor temp. ≤ 3.5℃, defrosting mode starts .

17

CONTENTS

REMARKS

4. Flow Chart of Defrosting Start

Start

Comp. operating time

is over 24 hours?

Total time is

over 60 hours?

Comp. operating time

is over 6 hours?

End

Defrosting start

Comp. operating time

is over 2 hours?

Any error ?

NO

YES

NO

NO

YES

Total door open

time is over 2 min?

YES

YES

YES

YES

NO

NO

NO

Comp. operating rate

is more 85%?

NO

YES

18

1. A/S Defrosting Mode (Heater defrost → Pause → Fan Delay)

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

1. Defrosting Cycle

1. Comp

2. F-Fan

3. R-Fan

4. D-Heater

Heater
Defrosting

1) Comp, F-fan, R-fan : OFF
D-HTR : ON

2) Time limit

30 seconds : Heater is ON regardless of D-sensor

temperature right after defrosting start

30 minutes : in case of D1-Error
80 minutes : in normal control state

3) If D-sensor ≥13℃, Heater Defrosting is OFF

Pause

Time : 7 minutes
Comp, F-fan, R-fan, Heater etc. : OFF

Fan-Delay

1) Time : 5 minutes
Comp : ON
F-fan, R-fan, Heater : OFF

Pause

Fan-Delay

Heater

Defrosting

2. How to start

1) Push “REF.TEMP” button 5 times while pushing “FRZ.TEMP” button simultaneously.

--------- FRS-U20IA

2) In “LOCK” mode, push “REFRIGERATOR SET” button 5 times while pushing “FREEZER SET”
button simultaneously. ------ FRS(N)-U20DA

3. How to proceed

1) Delete Pre-cool mode. (Others are same as normal defrosting)

2) Heater is ON regardless of D-sensor temp. at first 30 seconds.

(Check of defrosting current)

4-3. c (Forced Defrosting) Mode

1. Fan voltage of control mode

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

1. F-Sensor

2. R-Sensor

1. F-FAN, R-FAN, C-FAN

13 V13 V13 VVoltage

C-FANR-FANF-FANFAN

4-4. Fan Voltage of Control Mode

※ Refer to the 5-4. (Fan Function )

19

It is linked with comp.

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

1. Comp

Louver Heater

1. Buzzer sounds if any button of Inner Control is pushed.

2. Buzzer sounds 4 times 3 seconds after initial power input.

3. Buzzer sounds for 3 or 1 times in case of A/S forced defrosting and short (pull down)
operation or explanation mode.

4. If door is open, buzzer sounds after every 1 minutes for 5 minutes (Door open alarm)

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

1. Control (Inner or F-PCB) buttons

2. Door Switch

3. Initial Power Input

Buzzer

4-5. Louver Heater Control

4-6. Buzzer or Alarm Control

1. Control refrigerator compartment lights
R-Lights turn ON/OFF by R-door switch ON/OFF

(※ For 10 minutes after sensing door open, the lights turn off automatically

through door close is not sensed.)

2. Control of freezer compartment lights.
F-Light turn ON/OFF by F-door switch ON/OFF

(※ For 10 minutes after sensing door open, the lights turn off automatically

through door close is not sensed.)

3. R-lights ON/OFF by home bar door switch ON/OFF. ( for only model with home bar )
R-lights turn ON for 10 minutes after sensing home bar door switch open.

4. Dispenser lamp control ( for only model with water/ice dispenser )
Dispenser lamp turns ON/OFF by Dispenser switch.
Dispenser lamp turns ON for 4 seconds after sensing switch close.

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

1. Refrigerator door switch

2. Freezer door switch

3. Home bar door switch

4. Dispenser switch

Lamp

4-7. Control of Interior Lights (FRS(N)-U20DA / EA / FA / GA)

20

1. Start
Open and close “Freezer door switch” 5 times while pushing “FRZ. TEMP” button
simultaneously.

2. Control

1) All other electrical components are OFF except for F-fan / R-fan

2) Fan Control

Door open → Fan ON / Door close → Fan OFF.

3) Display control
“FRZ. LED” and “REF. LED” are ON in good order

3. Stop

1) During Demo mode, push “Freezer door switch” open and close 5 times while pushing

“FRZ. TEMP” button simultaneously.

2) Power in again

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

1. FRZ. TEMP

2. Door Switch

Comp
F/R-Fan
Heater

4-8. Demonstration

1. Start
Push “ICE/WATER” button 5 times while pushing “FREEZER SET” button
simultaneously.

2. Control

1) All other electrical components are OFF except for F-fan / R-fan

2) Fan Control

Door OPEN → Fan ON / Door close → Fan OFF.

3. Stop or termination

1) During Demo mode, push “ICE/WATER” button 5 times while pushing “FREEZER
SET” button simultaneously.

2) Power in again

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

1. “FREEZER SET, WATER/ICE” Button , Door switch

Comp
F/R-Fan
Heater

4-8-1. FRS(N)-U20IA

4-8-2. FRS(N)-U20DA / EA / FA / GA

21

Compensation of R-sensor ON/OFF temp. (down)

In case temperature of refrigerator compartment is weak or insufficient,

take the following action.

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

Main PCB

Resistance of R-sensor Mid ON/OFF Point

R36 : R-SENSOR standard resistance in normal mode (31.4K)
R37 : In case of weak ref., cut J1 (or J18) to down the standard resistance by 1.5deg(2K)
R38 : In case of weak ref., cut J2 (or J19) to down the standard resistance by 1.5deg(2K)

4-9. Compensation of R-sensor ON/OFF Point

FRS(N)-U20IA

FRS(N)-U20DA/EA/FA/GA

R-SENSOR

J2

R36

R37

R38

J1

R-SENSOR

J19

R36

R37

R38

J18

J1

J2

J18,19

※ Refer to the 5-2.

(Function of each sensor)

3

℃

-1.5

℃

0

℃

Temperature

compensation

cut--J19

cutcut-J18

FRS(N)

-U20DA

3

℃

-1.5

℃

0

℃

Temperature

compensation

cut--J2

cutcut-J1

FRS(N)

-U20IA

22

1. How to start

1) Press “FRZ.TEMP” button 5 times while pressing
“REF.TEMP” button at the same time.

2. How to stop

1) Push “FRZ.TEMP” button 1 time.

2) It stops automatically in 4 minutes from the start.

3. All the error codes are reset if they turn to be normal.

4. Error display

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

Temperature Control Buttons Lamp LED of Inner control

(Full down mode and forced defrost mode are displayed while pressing
“REF.TEMP” button at the error display mode)

REF. LED “1” is on and off (twice)Forced defrost mode for A/S

REF. LED “1” is onFull Down mode

REF. LED “1” is on and offEEPROM : defective

REF. LED “2” is on and offReturn after defrosting : defective

REF. LED “3” is on and offCycle : defective

REF. LED “5” is on and offF-Door Switch : defective

FRZ. LED “1” is on and offR-Door Switch : defective

FRZ. LED “2” is on and offD-sensor : open (“Lo”), short (“Hi”)

FRZ. LED “3” is on and offRT-sensor : open (“Lo”), short (“Hi”)

FRZ. LED “4” is on and offR-sensor : open (“Lo”), short (“Hi”)

FRZ. LED “5” is on and off F-sensor : open (“Lo”), short (“Hi”)

DisplayCONTENTS

4-10. Error Display

4-10-1. FRS(N)-U20IA (LED Display of Inner Control)

23

5. Control way of Errors (if any)

1) “F-sensor” error
Cause : F-sensor open or short
Control : Condition of ambient temperature
How to reset : If F-sensor is normal, the error is terminal temperature.

CONTENTS

REMARKS

2) “R-sensor” error

Cause : R-sensor open or short
Control : Condition of ambient temperature
How to reset : If R-sensor is normal, the error is terminal temperature.

3) “RT-sensor” error

Cause : RT-sensor open or short (full down)
Control : Normal operation, deletion of control by RT-sensor

If RT-sensor is normal, the error is terminated automatically.

4) “D-sensor” error

Cause : D-sensor open or short (full down)
Control : Time limit (30 min) of defrosting return

If D-sensor is normal, the error is terminated automatically.

5) “Door” error

Cause : in case it senses that door is open for more than 1 hour.
Control : Deletion of function related door switch sensing

If door switch (open & close) is sensed, the error is terminated automatically.

6) “Cycle” error

Cause : in case comp. works for over 3 hours when D-sensor temp. is over -5℃
Control : normal operation

When D-sensor temp. is below -5℃ in comp. off it is terminated.

7) “Return after defrosting” error

Cause : in case defrosting return is done by time limit of 80 min
Control : Deletion of Pre-cool mode in defrosting mode

If defrosting return is done by D-sensor, it is terminated.

8) A/S forced defrosting mode

Push “REFRIGERATOR SET” button 5 times while pushing “FREEZER SET” button
Simultaneously.
Control : A/S forced defrosting control (Pre-cool is deleted)
If D-sensor temp. is over 10℃, the mode is terminated automatically.
When all error code is normal, the Refrigerator reset

35 / 2035 / 2026 / 2227 / 4516 / 4114 / 50ON/OFF (min)

Over 41℃~ 41℃~ 31℃~ 21℃~ 15℃~ 9℃RT-S

6 / 44 / 63 / 72 / 103 / 50OFFON/OFF (min)

Over 41℃~ 41℃~ 31℃~ 21℃~ 15℃~ 9℃RT-S

24

1. How to start

1) Under “LOCK” mode, press “SUPER FREEZER” button 5 times while pressing
“FREEZER SET” button at the same time.

2) The front CLED displays as the right diagram shows
( [Ex.] Time Display of 0003 signifies 3 minutes of power on time.)

3) Press “FREEZER SET” button and the following value is displayed successively.

① Time
② F-Sensor temperature
③ D-Sensor temperature
④ R-Sensor temperature
⑤ RT-Sensor temperature
⑥ P Factor display (Refer to water supply mode of automatic icemaker)
⑦ Filter remaining time until change (First check ; 4,320Hr)

Refer to Filter Information Reset of CLED of front control panel.

4) Error is displayed only if there is any ; it is skipped if no error.

2. How to stop

1) Push “LOCK” button 1 time.

2) It stops automatically in 4 minutes from the start.

3. All the error Codes are reset if they turn to be normal.

4. Error code

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

Temperature Control Buttons 88 Display CLED

Display forced defrost mode for A/SD2

Display Full Down modeCo

Return after defrosting : abnormal or defectiveF3

Cycle : abnormal or defectiveC1

Full ice switch : errorEu

Drop the ice while EtEA

Micro switch : errorES

Water supply : errorEg

Horizontal switch : errorEt

Flow sensor : defectiveEF

I-sensor : disconnection (“Lo”), short (“Hi”)EI

Home bar Door Switch : defectivedH

F-Door Switch : defectivedF

R-Door Switch : defectivedr

D-sensor : disconnection (“Lo”), short (“Hi”)d1

RT-sensor : disconnection (“Lo”), short (“Hi”)rt

R-sensor : disconnection (“Lo”), short (“Hi”)r1

F-sensor : disconnection (“Lo”), short (“Hi”)F1

CONTENTSERROR CODE

4-10-2. FRS(N)-U20DA/EA/FA/GA (CLED Display of Front PCB)

25

1) “F1” error
Cause : F-sensor disconnection or short

Check point : Measure the resistance between both terminals after separating CN8 (or CN15)

of the Main PCB. (Refer to the 5-2.)

If F-sensor is disconnected or shorted , change the F-sensor in the freezer compartment.

How to reset : If F-sensor is normal, the error is terminal temperature.

CONTENTS

REMARKS

2) “R1” error

Cause : R-sensor disconnection or short
Check point : Measure the resistance between both terminals after separating CN7 (or CN14)

of the Main PCB. (Refer to the 5-2.)

If R-sensor is disconnected or shorted , change the F-sensor in the refrigerator compartment.
How to reset : If R-sensor is normal, the error is terminal temperature.

7) “F3” error

Cause : in case defrosting return is done by time limit of 80 min
Check point : Measure the resistance between both terminals of the defrost heater.

(Assembled with evaporator)

If the resistance is ∞Ω (disconnected) or 0Ω (short) change the

3) “rt” error

Cause : RT-sensor disconnection or short (full down)
Check point : Measure the voltage of “A” part on the Main PCB.

If the voltage is 0.5V~4.5V, it is normal.
If the voltage is 0V (short) or 5V (disconnected), change the RT-sensor on the Main PCB

How to reset : If RT-sensor is normal, the error is terminated automatically.

< FRS(N)-U20IA >

A

< FRS(N)-U20DA >

A

4) “d1” error

Cause : D-sensor disconnection or short (full down)
Check point : Measure the resistance between both terminals after separating CN8 (or CN15)

of the Main PCB. (Refer to the 5-2.)

If D-sensor is disconnected or shorted , change the D-sensor on the evaporator.

How to reset : If D-sensor is normal, the error is terminated automatically.

5) Door error (“dF” “dR” “dH” on display)

Cause : in case it senses that door is open for more than 1 hour.
Check point : F/R door is opened or not.

6) “C1” error

Cause : in case comp. works for over 3 hours when D-sensor temp. is over -5℃
Check point : Refrigerant leakage.

8) “d2” mode (A/S forced defrosting mode)

Push “REFRIGERATOR SET” button 5 times while pushing “FREEZER SET” button

simultaneously.

Control : A/S forced defrosting control (Pre-cool is deleted)
If D-sensor temp. is over 10℃, the mode is terminated automatically.
Refer to the 4-3. .

5. Control way of Error (if any)

26

9) “EI”ERROR

Cause : I-SENSOR disconnection / short

Check point : Measure the resistance between both terminals after separating CN11

of the Main PCB. (Refer to the 5-2.)

If F-sensor is disconnected or shorted , change the I-sensor in the automatic ice maker.

CONTENTS

REMARKS

10) “EF” ERROR

Cause : When Flow-sensor ERROR (There is no Pulse during some time)

The number of pulse signal is below 10 by 1 sec during water supply.

Check point : Water supply line

13) “Ea” error

Cause : Malfunction of ice drop motor.

Check the motor by pushing test switch.

11) “Eg” ERROR

Cause : I-sensor temp (5min after water supply) doesn’t go up.

Check the I-sensor or water supply line.

12) “ES” error (MICRO switch error)

Cause : When it senses 1min continuously

Check the MICRO switch of the dispenser.

14) “Eu” error

Cause : Switch (which senses if the ice is full or not) is in error.

Control : When dropping the ice, the motor just rotates 90 degree.

Termination : When the switch is in normal.

15)“EA“ ERROR

Cause : When sensing Ice dropping by time 3 times in level sensor SW Error.

Control : Stop of Ice Maker

Termination : With normal level switch.

Re-input of power or push if icemaker test switch.

16)“Et” ERROR

Cause : Level switch error (No pulse is sensed for some time)

Control : By time (Supply mode is skipped)

Termination : Normal condition.

* When all ERROR CODE is normal, the Refrigerator reset

27

Element A/S Function

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

Each button

Resistance of R-sensor Mid ON/OFF Point

“REF.TEMP”+ “FRZ.TEMP” 5 timesError display

“FRZ.TEMP”+ “FRZ.DOOR” OPEN/CLOSE 5 timesDemo function

“REF.TEMP”+ “FRZ.DOOR” OPEN/CLOSE 5 timesPull Down

“FRZ.TEMP” + “REF.TEMP” 5 timesForced Defrosting

1. All the modes are started “LOCK” mode (except “FILTER RESET” mode)

2. Element A/S Function

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

Each button

Resistance of R-sensor Mid ON/OFF Point

“WATER/ICE” + “ICE MAKER LOCK” 5 timesIce maker test

“WATER/ICE”+ “RESET WATER FILTER” 5timesEEPROM clear

“FREEZER SET”+ “SUPER FREEZER” 5 timesError display

“REFRIGERATOR SET”+ “FREEZER SET”+ “WATER/ICE”5 timesPull Down

“REFRIGERATOR SET” + “WATER/ICE” 5 timesDemo function

Push “RESET WATER FILTER” for 3 secondsReset water filter

“FREEZER SET” + “REFRIGERATOR SET” 5 timesForced Defrosting

4-11. Summary of Function

4-11-1. FRS(N)-U20IA (Inner Control)

4-11-2. FRS(N)-U20DA/EA/FA/GA (Front PCB)

28

1. Filter Exchange Information : Record as a real-time from the point of
power input

2. P Factor (Information about Ice Maker)

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

None

1. F-FAN, R-FAN, C-FAN

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

Full ice sensing switch
Ice Maker Lock
Sensors

Ice separating motor

1. Flow of ice making

1) Press TEST switch under the Icemaker for more than 1 second and test starts.
* Test mode starts from ice separating mode.
* In case test switch has an error of short, test is done only once.

START

Ice making mode

Ice separating mode

Water supply mode

Water supply

check mode

RETURN

Ice is being made

▶

▶

Ice tray is twisted to separate

ice cubes

▶

Water is supplied to ice tray

▶

Check is water is supplied OK.

(water supply stand by)

4-12. Back up Function (FRS(N)-U20DA/EA/FA/GA)

4-13. Automatic Icemaker ( FRS(N)-U20DA/EA/FA/GA)

29

CONTENTS

REMARKS

2) With the initial power input, Ice tray turns to be horizontal and ice making

mode starts.

3) Control of water hose heater

* Heater is always ON if RT-sensor has an error or RT is below 15 degree.

* Heater is always ON for 60 minutes (max. Limit time) if Flow-sensor has

an error

4) Water supply stand-by

Condition : if ice is sensed full

Operation : proceeds to Ice making mode (Ice separating and water supply Modes stop)

5) Crusher Function

It stops operation when freezer door is open

It operates if freezer door is closed.

2 Ice making mode

START

130 min passed?

I-S＜－12.5℃

Ice saparating mode

I-S＜-9.5℃

15 min passed?

NO

NO

YES

YES

YES

NO

NO

YES

1) Ice making stops if ice-sensor is below -12.5℃ after 130 minutes.

2) Ice making also stops if ice-sensor is below -9.5℃ for 15 minutes, though
ice-sensor is not below -12.5℃ after 130 minutes.

3) In case of ice sensor, ice making stops after 4.8 hours.

30

CONTENTS

REMARKS

3. Ice separating (drop) mode

CCW

CW

STOP

CW

motor

revolution

level SW

status of

ice tray

Horizontal position

Ice separation start

8~11sec

MAX1.1sec 8.5~12.2sec 0.2sec

normal

level SW

level SW

error

1.1 sec11 sec10 sec

1) Time of each zone used to verify level switch error

2) The rotation of motor is sensed at each zone

3) In case of level switch error, ice separation is done by time.

4) If ice separating motor has error, the mode stop.

4. Water supply mode

START

Water supply valve ON

Water flow Pulse Count = 0

N

Water flow Pulse spec

〉Pulse spec

END

water supply time 〉time spec

water supply valve OFF

Y

1sec passed after

water valve ON ?

Water flow Pulse > 10

Flow-Sensor Error mode operation

Y

N

Y

Y

N

N

31

CONTENTS

REMARKS

1) Water supply valve is open when water supply mode starts after separation of ices.

2) Water is supplied by time in case sensor has error.

3) Factor valve is variable which can be useful in AS action

① Water flow pulse is set to 238 if flow sensor is in normal condition.

(If water is supplied by time, maximum water supply time 165 seconds)

② In case water flow sensor has error, water time is 5.5 seconds.

5. Water supply check mode
5 minutes after water supply the status can be checked by RT-sensor and increase
of temp. Ice sensor.

-5℃-6℃-7℃-8℃-9℃-10℃I-S

41℃↑~41℃~31℃~21℃~15℃9℃↓RT-S

4-14. Dispenser Control Function

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

Dispenser switch
WATER/ICE Button
ICE MAKER LOCK Button
Freezer Door Switch

Dispenser Lamp
Crusher Motor
Flap Solenoid
Crusher Solenoid
Dispenser Water Valve

1) Initial mode : water

(Mode change : Water → Cubed ice → Crushed ice)

- Selected icon LED turns ON and others are OFF.

2) ICE MAKER LOCK Button

Icemaker Lock function and its ICON Turn ON/OFF by pressing the button.

3) Display

① Water ICON turns ON as default mode
② The ICON of each mode turns ON by pressing its button.

(If display switch makes error during operation of a mode, its ICON turns OFF)

③ When Icemaker Lock ICON turns ON.

- ICE MAKER LOCK ICON turns ON

- If it is in the mode of Cubed Ice or Crushed Ice, the mode is changed to

Water and Water ICON turns ON

- If there is no button input for 1 hour after selecting Cubed Ice or Crushed

Ice the mode turns to Water (default)

32

1. “Select” button

1) Temperature control of “Magic Cool Zone” compartment

2) 4 step mode of successive temperature mode.
Initial mode by power input : “OFF”
(“Off” → “Vegetable” → “Fish”→ “Meat”→ “Off”)
Letters are indicated on “88” display LED

INPUT

CONTROL OBJECT

CONTENTS

REMARKS

1. R-Fan

2. “Magic Cool Zone” sensor

3. “SELECT” button

1. “Magic Cool Zone” damper

2. Damper heater

4-15. Temperature control of “Magic Cool Zone” compartment (

FRS(N)-U20EA/GA)

2. Normal Stepping motor Control (It is linked with Refrigerator Fan (R-Fan))

3. Damper heater control

1) Damper open → Damper heater OFF

2) Damper close → Damper heater ON

4. How to check error mode (Temp. display and forced damper Open/Close)

1) How to start
Push “Select” button for 2 seconds.
① Initial display : “sensor temp.” display. (if sensor is normal)

“Er” display. (if sensor is disconnected or short)

② Press “Select” button 1 time : “OP” display. (forced damper open )
③ Press “Select” button 2 time : “CL” display. (forced damper close )

2) How to stop
It stops automatically in 20 sec. from the start.

5. Control way for “Magic Cool Zone” sensor error.

1) If “Magic Cool Zone” sensor is disconnected or short.

2) Damper open and close by below table. Control (Condition of “Select” button)

-

-

-

Off

Power input

3’rd Press

2’nd Press

1’st Press

01-3Meat

23-1Fish

893Vegetable

Temp (℃)Temp (℃)

CloseOpen

Damper Open/Close point

DisplayMode

Each mode ON/OFF ControlOFF

Always closeON

Remark“Magic Cool Zone” damperR-Fan

R-Fan

“Select”

Close

Close

“Off”

Open

After 2min open

from R-Fan off,

and then close

CloseOFF

CloseCloseCloseON

“Meat”“Fish”“Vegetable”

Condition

“Vegetable”

“Fish”

“Meat”

33

CONTENTS

REMARKS

4) Control Flow & Timing Chart

① Crushed Ice

② Cubed Ice

③ Water

Delay time : A = 500ms, B = 500ms, C = 2.0s, D = 5.0s

D.P SW

D.P SW D.P SW

D.P SW

Gear Motor

Gear MotorGear Motor

Gear Motor

D.P Lamp

D.P LampD.P Lamp

D.P Lamp

D.P S/V

D.P S/V D.P S/V

D.P S/V

(Flap)

(Flap)(Flap)

(Flap)

D

A

A

C

D.P SW

D.P SW D.P SW

D.P SW

Cube S/V

Cube S/VCube S/V

Cube S/V

D.P S/V

D.P S/V D.P S/V

D.P S/V
(Flap)

(Flap) (Flap)

(Flap)

Gear Motor

Gear MotorGear Motor

Gear Motor

D.P Lamp

D.P LampD.P Lamp

D.P Lamp

A

C

A

A

B

D

D.P Lamp

D.P LampD.P Lamp

D.P Lamp

D.P SW

D.P SW D.P SW

D.P SW

Water S/V

Water S/VWater S/V

Water S/V

D

A

34

5-1. Power Circuit Diagram

5. CIRCUIT OPERATION

■ FRS(N)-U20IA

5Vdc14.5Vdc12Vdc310Vac230VdcVoltage

CE6CE4CE3CE1MC1

EDCBA

Parts

A

■ FRS(N)-U20DA/EA/FA/GA

B

D

C

E

A

B

C

D

E

※ Voltage of every part

※ Caution : Since high voltage (DC310V) is maintained at the power terminal, please take a measure after more

than 3minutes have passed after removing power cords in the abnormal operation of a circuit.

35

[F-sensor]

1) It senses the temperature of freezer compartment and control Comp., F-fan ON/OFF

2) How it works;

-19℃-16℃-11℃Working Temp.

≒3.24V

≒9.32㏀

Low ON

≒2.73V≒2.93VSensing Voltage

≒15.58㏀≒15.19㏀Resistance

High OFFMid OFFWorking Point

[R-sensor]

1) It senses the temperature of refrigerator compartment and control R-fan ON/OFF

2) How it works;

3.2℃5.2℃7.7℃Working Temp.

≒2.96V

≒23.33㏀

Low ON

≒2.72V≒2.83VSensing Voltage

≒24.76㏀≒24.05㏀Resistance

High OFFMid OFFWorking Point

[D-sensor]

1) It senses return point of defrosting heater.

2) How it works;

13℃Working Temp.

≒3.08V

≒22.56㏀

Return point of defrosting heater

Sensing Voltage

Resistance

Working Point

CONTENTS

REMARKS

5-2. Function of Each Sensor

■ FRS(N)-U20IA

* In case temperature of refrigerator compartment is weak or insufficient though comp.

and R-fan operate in normal way;

1) Cut J1 on the M-PCB, then temp. is lowered 1.5℃ than [Mid OFF point]

2) Cut J1 and J2 on the M-PCB, then the temp, is lowered 3℃.

IC1

(MICOM)

Compensation of

R-sensor ON/OFF temp.

A

C

B

36

CONTENTS

REMARKS

■ FRS(N)-U20DA/EA/FA/GA

[F-sensor (A)]

1) It senses the temperature of freezer compartment and control Comp., F-fan ON/OFF

2) How it works;

-19℃-16℃-11℃Working Temp.

≒3.24V

≒9.32㏀

Low ON

≒2.73V≒2.93VSensing Voltage

≒15.58㏀≒15.19㏀Resistance

High OFFMid OFFWorking Point

[R-sensor (B)]

1) It senses the temperature of refrigerator compartment and control R-fan ON/OFF

2) How it works;

3.2℃5.2℃7.7℃Working Temp.

≒2.96V

≒23.33㏀

Low ON

≒2.72V≒2.83VSensing Voltage

≒24.76㏀≒24.05㏀Resistance

High OFFMid OFFWorking Point

[D-sensor (C)]

1) It senses return point of defrosting heater.

2) How it works;

13℃Working Temp.

≒3.08V

≒22.56㏀

Return point of defrosting heater

Sensing Voltage

Resistance

Working Point

* In case temperature of refrigerator compartment is weak or insufficient,

though comp. and R-fan operate in normal way;

1) Cut J18 on the M-PCB, then temp. is lowered 1.5℃ than [Mid OFF point]

2) Cut J18 and J19 on the M-PCB, then the temp, is lowered 3 ℃

IC1

(MICOM)

Compensation of

R-sensor ON/OFF temp.

A

B

C

D

37

1. Circuit Diagram

#14≒12V

#12≒12V

#10≒12V

#14≒0.7V

#12≒0.7V

#10≒0.7V

IC7#3≒0V#3≒5.0VRelay 3Louver Heater

OFF ConditionON Condition

#5≒0V#5≒5.0VRelay 5D-Heater

Relay 1

Control Mode

Method

IC7

IC ULN2004

Output pin

#1≒5.0V

MICOM Port

#1≒0V

MICOM Port

Comp

IC ULN2004

Output pin

Control

CONTENTS

REMARKS

5-3. Relay Function

■. FRS(N)-U20IA

2. How it works;

IC1

(MICOM)

Comp

D-Heater

Louver Heater

D-Heater

Louver Heater

Comp

R-Lamp

F-Lamp

38

1. Circuit Diagram

CONTENTS

REMARKS

■ FRS(N)-U20DA/EA/FA/GA

2. How it works;

#15≒12V

#14≒12V

#13≒12V

#12≒12V

#11≒12V

#10≒12V

#15≒12V

#14≒12V

#13≒12V

#12≒12V

#11≒12V

#10≒12V

#15≒0.7V

#14≒0.7V

#13≒0.7V

#12≒0.7V

#11≒0.7V

#10≒0.7V

#15≒0.7V

#14≒0.7V

#13≒0.7V

#12≒0.7V

#11≒0.7V

#10≒0.7V

OFF ConditionON Condition

#3≒0V#3≒5.0VRelay 3H/B Heater

IC8

#7≒0V

IC8

#7≒5.0VRelay 7Water (Dispenser)

#6≒0V#6≒5.0VRelay 6Water (Ice)

#5≒0V#5≒5.0VRelay 5Dispenser-Solenoid

#4≒0V#4≒5.0VRelay 4Dispenser-Lamp

#9≒0V#9≒5.0VRelay 9D-Heater

#8≒0V#8≒5.0VRelay 8Geared-Motor

#10≒0V#10≒5.0VRelay 10F-Lamp
#11≒0V#11≒5.0VRelay 11Cube-Solenoid

Relay 12

Relay 2

Relay 1

Control Mode

Method

IC7

IC ULN2004

Output pin

#12≒5.0V

#2≒5.0V

#1≒5.0V

MICOM Port

#12≒0V

#2≒0V

#1≒0V

MICOM Port

IC7

Comp

IC ULN2004

Output pin

Water Pipe Heater

R-Lamp

Control

IC1

(MICOM)

D-Heater

Louver Heater

Comp

R-Lamp

F-Lamp

39

5-4. Fan Function

■ FRS(N)-U20IA

■ FRS(N)-U20DA/EA/FA/GA

- Vref is the reference voltage for the adjustment of the output voltage by the voltage
distribution of Vs (Maximum output voltage), and the output voltage applied to the fan
is determined by the PWM control using the software.

2. Explanation for the operation
* TA7291P is the drive IC for the only DC motor, and used for control of the fan motor
* One input and output is used for the control of the fan motor

Motor IC No.2 Pin

(R:MT2/F:MT3/C:MT1)

Motor IC No.5 Pin

(R:MT2/F:MT3/C:MT1)

Low

High

Output

StopLow

13VHigh

Remark

Input

1. Circuit Diagram

40

6-1. Wiring Diagram

6. DIAGRAM

■ FRS(N)-U20IA

41

■ FRS(N)-U20DA / EA / FA / GA

42

6-2. Circuit Diagram of Main PCB

■ FRS(N)-U20IA

43

44

■ FRS(N)-U20DA / EA / FA / GA

45

46

7. COMPONENT LOCATE WIEW

7-1. Front View

F-Sensor

Automatic

Ice Maker

Geared

Motor

R-Sensor

R-Sensor

Inner

Controller

F-Door
Switch

R-Door
Switch

R-Door

Switch

Freezer Compartment

(FRS(N)-U20DA)

Front PCB

Dispense

r

Button

Home bar

Door

(Option)

F-Lamp

F-Fan
Motor

R-Lamp

R-Fan
Motor

7-2. Inner View

Refrigerator

Compartment

(FRS(N)-U20DA)

Refrigerator

Compartment

(FRS(N)-U20IA)

47

D-Sensor

Temp

Fuse

Defrost

Heater

Water Pipe

Evaporato

r

Compressor

Condenser

Dryer

Running

Capacitor

OLP

& PTC

Water
Valve

Condenser

Fan-Motor

Tray Drip

Power cord

7-3. Evaporator

7-4. Machine Compartment

48

NO

DISASSEMBLING PROCEDURE NO DISASSEMBLING PROCEDURE

1 5

2 6

3 7

4 8

▷Pull forward Ice Storage Case

▷Remove 2 screws at the Cove

Guide Cab W/Tube A.

▷Remove 2 screws. ▷Disassemble Cover Guide Cab W/Tube A

▷Pull forward Ice Maker. ▷Pull forward Hose Ice Maker Tube As.

▷Remove Water Hose Heater's 2P housing.

▷Check Hose Ice Maker Tube As.

2) How to check Hose Ice Maker Tube As.

How to check CRITERION

▷Measure the resistance

of two wire

▷Good: 9680Ω(±8%)

(8900 ~ 10456Ω)

▷If defective, change

8. HOW TO CHECK EACH PARTS

8-1. Hose Ice Maker Tube Assembly

1) Disassembling Procedure

49

NO

DISASSEMBLING PROCEDURE NO DISASSEMBLING PROCEDURE

1 4

2 5

3 6

▷Remove 2 screws.

▷Pull forward Bracket Geared Motor.

▷Unscrew (4 points).

▷Separate 6 pin housing of Bracket

Geared Motor from the top connector.

▷Check Solenoid Valve and Geared Motor.

2) How to Check Hose Ice Maker Tube Assembly

SPEC. CRITERION

▷GOOD : 11.3Ω(±10%)

(10.8 ~ 12.7Ω)

▷DEFECTIVE ;

Change the Geared Motor.

PARTS HOW TO CHECK

▷GOOD : 145Ω(±8%)

(133 ~ 156Ω)

▷DEFECTIVE ;

Change the Cube Sol Valve.

▷Check resistance value of

2 terminals with a Multi Tester.

▷SPEC. NAME

:DAG-6502DEC

▷VOLTAGE

:220/240V,50Hz

▷SPEC. NAME

:Cube SN8

▷VOLTAGE

:220/240V,50Hz

▷Check resistance value of

2 terminals with a Multi Tester.

Geared Motor

Cube Sol Valve

8-2. Bracket Geared Motor Assembly

1) Disassembling Procedure

Unscrew (red 4 screws).
Unscrew (blue 4 screws).

50

NO

DISASSEMBLING PROCEDURE NO DISASSEMBLING PROCEDURE

1 3

2

▷ Insert (-) screw driver into bottom hole of

Dispenser Button Guide.
Pull up forward to remove the guide.
(Be careful not to damage guide surface.)

▷ Remove Micro switch.

2) How to Check Micro Switch

CRITERION

▷GOOD :

▷DEFECTIVE :

Change Micro Switch.

PARTS HOW TO CHECK

SPEC. NAME
: VP333A-OD-8

VOLTAGE
:125V,3A

8-3. Dispenser Micro Switch

1) Disassembling Procedure

▷Check both terminals

(red circle) with a Multi Tester

(Tester Mode : Resistance (Ω).

Tact Switch

(Blue Circle)

Terminals

(Red circle)

Tester Result

(Resistance Mode)

ON (Close) Connected Some Value

OFF (Open) Disconnected No value (0)

▷Check Micro Switch.

▷Separate wire connectors

from Micro Switch.

4

51

NO

DISASSEMBLING PROCEDURE NO DISASSEMBLING PROCEDURE

1 4

3 6

▷ Separate 2 housings of 10P / 7P
from Front PCB.
(Do not hold only wires to pull out.)

▷Unscrew (3 points) to remove Sol Valve.

▷Unscrew (2 points) to remove Box

Dispenser Shut.

▷Unscrew (1 point) to remove Cover Ice Flap.

2) How to Check Micro Switch

8-4. Dispenser Solenoid Valve

1) Disassembling Procedure

SPEC. CRITERION

▷ Good : 215Ω(±10%)

(193 ~ 236Ω)

▷DEFECTIVE : 0

Change Sol Valve.

PARTS HOW TO CHECK

▷GOOD : 96Ω(±8%)

(88 ~ 104Ω)

▷DEFECTIVE ;

Change Flap Heater AS.

▷SPEC. NAME

:SOL2003-01B

▷VOLTAGE

:220/240V,50Hz

▷VOLTAGE

:DC 12V,1.5W

▷Check resistance value of

both terminals with a tester.

Dispenser

Sol Valve

Flap Heater

Assembly

▷Check resistance value of

both terminals with a tester.

2 5

▷ Insert (-) screw driver into bottom left groove

of Cover Dispenser Box. Pull forward with a
snap.(Be careful not to damage cover and
door surface.)

▷Separate 2 terminals from Sol Valve and
2P Housings from Cover Ice Flap.

52

8-5. Main PCB

1

2

3

4

5

6

ITEM REMARK

NO CHECK POINT

Compensation of
Weak Refrigeration
→Making R-temp

cooler

1

* Used when making R-temp. down

to compensate for weak refrigeration
without changing FCP temp. setting.

▷Cutting of J1 ; down by 1.5℃
▷Cutting of J1, J2 ; down by 3℃

Relay Power
Controller

2

* To check normal voltage of each electrical devices

to & from Mi-com.

▷Check input & output voltage of MICOM and IC7

Fan Power
Controller

3

* To check input & output voltage of Fan

▷#2 : Input

▷#5 : Output

Electric Current Fuse

4 * To check when each device does not work (250V,3.15A)

Time Shortening
Switch

5 * To shorten time in PCB checkup

(Pressing 1 time is regarded as 1 minute has passed.)

Regulator IC(5V)6 * To check voltage of MICOM and IC

Voltage check of IC#6 (Input :12V,Output : 5V)

J1

J2

■ FRS(N)-U20IA

F

R

C

53

ITEM REMARK

NO CHECK POINT

Compensation of
Weak Refrigeration
→Making R-temp

cooler

1

* Used when making R-temp. down

to compensate for weak refrigeration
without changing FCP temp. setting.

▷Cutting of J18 ; down by 1.5 ℃
▷Cutting of J18, J19 ; down by 3℃

Relay Power
Controller

2 * To check normal voltage of each electrical devices

to & from Mi-com.

▷Check input & output voltage of MICOM and IC7, 8.

Fan Power
Controller

3

* To check input & output voltage of Fan

Electric Current Fuse

4 * To check when each device does not work (250V,3.15A)

Time Shortening
Switch

5 * To shorten time in PCB checkup

(Pressing 1 time is regarded as 1 minute has passed.)

Regurator IC(5V)

6 * To check voltage of MICOM and IC

Voltage check of IC#6 (Input :12V,Output : 5V)

1

2

3

4

5

6

J18,19

■ FRS(N)-U20DA/EA/FA/GA

▷#2 : Input

▷#5 : Output

F

R

C

54

NO

DISASSEMBLING PROCEDURE NO DISASSEMBLING PROCEDURE

1 6

3 8

▷ Pull forward ice maker. ▷Unscrew (3 points) Plate Gear Fixture.

▷Unscrew Fixture of Frame Ice Maker.

▷ Check if ice dropping motor is normal (OK).

8-6. Ice Maker

1) Disassembling Procedure

2 7

▷ Remove 2 screws on top front of ice maker.

▷Remove full ice sensing switch and level switch.

4 9

▷Separate Ice Maker Assembly from

Frame Ice Maker.

▷Remove 2 pin housing from Plate Gear Fixture.

5 10

▷ Separate Cover I/M (A) from Cover I/M (B)

with a (-) screw driver.

▷ Remove I-sensor (ice sensor) from

Case Icing As.

* Follow the reverse order when assembling.

55

PARTS HOW TO CHECK CRITERION

Ice Dropping Motor

2) How to Check Ice Maker

▷ Check resistance value of 2 wires

with a Multi Tester.

▷ GOOD : RS-360RH-14250

: 6 ~ 14Ω

▷ DEFECTIVE :

Change the motor.

I-Sensor
(Ice Sensor)

▷ Check resistance value of 2 wires

with a Multi Tester.

▷ GOOD : 4.4 ~ 50kΩ

(It depends on surround temp.)

▷ DEFECTIVE :

Change the sensor.

Full Ice
Sensing Switch

▷ Check resistance value of 2 terminals

with a Multi Tester.

▷ GOOD :

▷ DEFECTIVE :

Change the switch.

Level Switch

▷ Check resistance value of 2 terminals

with a Multi Tester.

▷ GOOD :

▷ DEFECTIVE :

Change the switch.

Tact Switch

(Blue Circle)

Terminals

(Red circle)

Tester Result

(Resistance Mode)

ON (Close) Connected Some Value

OFF (Open) Disconnected No value (0)

Tact Switch

(Blue Circle)

Terminals

(Red circle)

Tester Result

(Resistance Mode)

ON (Close) Connected Some Value

OFF (Open) Disconnected No value (0)

56

1) Insert a flat tip driver into the left down groove of panel frame and snap it out smoothly.

2) Separate 2 housings of 10P / 7P from Front PCB. (Do not hold only wires to pull out.)

3) Unscrew (7 points) to remove Front PCB.
* Follow the reverse order when assembling.

※ How to replace Front PCB

Change the Main Fuse

(AC250V 15A)

(In the left side of

machine compartment)

Start

Power cord or Fuse

is disconnected ?

1’st power of SMPS

is on?

Main PCB Fuse is

disconnected?

Voltage

(DC12V/14.5V/5V) on

Main PCB is OK?

Wire connection

of F-PCB is OK?

Check power Cord connection

from machine compartment and

to CN1 of M-PCB.

Change F-PCB AS.

Change Main PCB

Change the Fuse

(AC250V 3.15A)

(on the Main PCB)

Y

N

N

Y

N

Y

Y

N

Y

N

Checkup and connect

F-PCB wires.

9-1. Faulty Start (F/R lights OFF , F-PCB Power OFF)

※ Refer to the 5-1.

(Power circuit diagram)

9. TROUBLE DIAGNOSIS

57

Refer to error display

in operation and function

Start

Change the

Comp.

Change Fuse. Temp

Y

N

N

Y

N

Y

Y

N

Y

N

Change OLP/PTC

Change F/C-Motor

Change M-PCB

Check lead wire

Change the

Defrost Heater

Check ice formation on Eva.

And if refrigerant leak

is found, repair it.

N

N

Y

Y

Y

N

N

Defrost Heater : 192W (252 Ω)

※ Left-lower side of Evaporator

(4

th

pipe from buttom)

OLP/PTC

is OK?

Does Comp.

work?

Any Error code

on F-PCB?

F/C-Motor

works OK?

F/C-Motor

is OK?

Wiring connection

Is OK?

Temp. Fuse

Is OK?

Defrost Heater

Is Ok?

Ice formation on Eva.

Is OK?

Y

9-2-1. Freezing failure . (Foods are not frozen / cold.)

9-2. Freezer Compartment

※※※※ Refer to the 4-10.

(Error Display)

58

1) Remove foods.

2) Remove Ice Bucket,
shelves and cases in
Freezer compartment.

(1)

Removing and replacing Freezer parts

* Remove 2 screws

of Ice Maker.

* Remove the Housing

of Ice Maker AS.
(Right side)

* Remove 4 screws

of Geared Motor.

* Remove the Housing

of Geared Motor AS.
(Center)

(2)

(3)

(4)

(5)

59

* Remove light cover screws.

* Pull down smoothly the

bottom of light cover to
remove.

* Remove the screw of

bracket F-Lamp.

* Remove the left housing.

* Hold the end of F-Fan cover

and pull forward slowly.

* Remove the screw cap on

the F-Louver A with a flat
tip driver.

Removing and replacing Freezer parts

* Pull out smoothly the

bracket F-Lamp AS.
to remove.

* Remove 3 screws of

F-Louver A.

* Hold the end of F-Louver A

and pull forward slowly.

* Remove the housing.

* Remove the screw of

F-Return cover
and pull out cover.

* Hold the end of F-Louver B

and pull forward slowly.

(6)

(7)

(8)

(9)

(10)

(11)

(12)

(13)

(14)

(15)

(16)

(17

60

Removing and replacing Freezer parts

F-Louver B Heater Housing

D-Sensor Housing

1st : F-Louver B Heater Housing
2nd : None.
3rd : Defrost Heater Housing.

Temp. Fuse

Defrost Heater

D-Sensor Defrost Heater

Temp. Fuse Housing

61

Reassemble the door.

Start

Explain not to open

doors too frequently.

Y

N

N

Y

Remove the gap.

Wipe out dews on the

louver surface and run

the refrigerator again.

Change the louver assembly.

Y

N

Y

Y

Y

N

N

Make enough distance

between heat appliances

and refrigerator.

Y

N

N

9-2-2. Ice Formation on F-Louver

Dews are formed on the

gasket surface inside F

compartment ?

Gasket has a gap

between cabinet ?

Door is hanged

down ?

Door is open and closed

too frequently ?

Heat appliances are too

close to the refrigerator ?

Watery or hot foods are

stored in refrigerator

compartment ?

Louver heater is

disconnected ?

62

Change the light bulb.

Start

Repair the F-door switch.

Check the F door switch

connection and F-light socket.

Y

N

N

Y

Change of F Lights

Change of F Door Switch

* Remove 2 screws

of light cover.

* Hold the bottom of light

cover and pull forward
to remove.

* Change the light bulb.

(AC240V 25W)

* Insert a flat tip screw

driver Into a gap of door
switch to pull forward.

* Disconnect the housing

and change the switch
for a new one.

①①①①

②②②②

③③③③

①①①①

②②②②

9-2-3. Disconnection / breaking of Freezer Lights Wires

Freezer light filament is

disconnected or breaking ?

Connection of F door

switch is OK ?

※ Be careful when changing

the switch. F and R door
switch are different in type
and shape.

※ Follow the reverse order

of disassembling after
changing the switch.

※ Follow the reverse order

of disassembling after
changing the light.

63

9-3. Refrigerator Compartment

Solve error code

problem, if any.

Start

Y

N

N

Y

N

N

Y

Y

Change

the R-Motor.

Change the Main PCB.

Check the wirings.

Explain not to place foods close to

R-sensor or cold air spout.

Explain not to open doors

unnecessarily or frequently.

N

Y

N

Y

Y

Refer to “Freezing

does not work.”

N

Reassemble doors.

Repair to eliminate

the gap of gasket.

Y

N

Y

N

Change the R-Sensor

and check connector.

Y

Y

N

N

9-3-1. Refrigeration failure (Foods does not get cool or cold soon.)

Any error mode

on F-PCB?

R-Motor works OK ? R-Motor is OK ?

Wiring connection

Is OK ?

R-Sensor is OK

(normal) ?

Freezer compartment

Is OK ?

Refrigerator gasket

have gap ?

Gasket have

any gap ?

Door is hanged down
to make gap between

cabinet ?

Foods are placed just
close to R-Sensor ?

Refrigerator door

openings are too often ?

* Advise to use in “HIGH” mode
* Jumper cutting of Main PCB to

prevent weak refrigeration ;

→ Option 1 : cut J18 to down 1.5℃.
→ Option 2 : cut J19 to down 1.5℃.

※※※※ Refer to the 4-10.

(Error Display)

64

* Remove screws

of light cover.

* Hold the bottom

of cover and pull
forward to remove.

①①①①

②②②②

③③③③

* Change the light

bulbs.
(AC240V 25W)

Change the light bulb.

Start

Repair the R-door switch.

Check the R-door switch

connection and R-light socket.

Y

N

N

Y

Freezer light filament is

disconnected or breaking ?

Connection of R door

switch is OK ?

9-3-2. Disconnection / Breaking of Refrigerator Lights Wires

Change of F Lights

Change of F Door Switch

※ Follow the reverse order

of disassembling after
changing the light.

①①①①

②②②②

* Insert a flat tip screw

driver into a gap of door
switch to pull forward.

* Disconnect the housing

and change the switch
for a new one.

※ Be careful when changing

the switch. F and R door
switch are different in type
and shape.

※ Follow the reverse order

of disassembling after
changing the switch.

65

Reassemble the doors.

Start

Explain not to open

doors unnecessarily.

Y

Y

Repair to eliminate the gap.

Make enough distance between

the appliances and refrigerator.

Advise to cool down foods, wrap

or cover foods with much water

before storing in the compartment.

Repair and change R-motor.

Y

N

Y

Y

Y

N

N

N

N

Explain not to open doors

too long.

Y

N

N

N

Y

9-3-3. Dews on Refrigerator Compartment

Dews are formed

on the gasket inside

R-compartment?

Gasket has

Any gap ?

Door is

hanged down ?

Door is open too long ?

Door is open and closed

too frequently ?

Heat appliances are

used near the refrigerator ?

Watery or hot foods are

stored in the R-compartment?

R-fan works OK ?

66

Start

Explain the temperature modes.

Advise to set the temp. to

“Middle” or “LOW” mode.

N

Repair and/or Change

the R-check valve.

Change the R-sensor.

Y

N

N

Y

Check the R-sensor connection.

(Check the connector to Main PCB.)

N

Y

※ Refer to “Repair /Change

of Check Valve”.

Y

9-3-4. Excessive Refrigeration of Vegetable Case

Refrigerator temp.

mode is “HIGH” ?

R-check valve

Works OK ?

Is there any

R-sensor error code ?

R-sensor is OK ?

67

* Hold the bottom and

right of damper to pull
down to remove.

* Lift up a piece of Check Valve

Flap and insert a finger to the
valve frame to hold out.

⑤⑤⑤⑤

⑦⑦⑦⑦

⑥⑥⑥⑥

⑧⑧⑧⑧

Removing of Check Valve

* Remove screws

of light cover.

* Hold the bottom

of cover and pull
forward to remove.

①①①①

②②②②

③③③③

④④④④

* Disconnect light

housing.

* Remove screws with a

(+)screw driver.

68

Start

Level the refrigerator by

adjusting wheels.

☞ Refer to User’s Guide

and SVC Manual.

Y

N

Set it right.

Y

N

Change the Rubber absorber.

Y

N

Attach a restrainer on the comp.

head to reduce vibration and

high frequency noise.

Y

N

Change the compressor.

Remarks

● Compressor sound is somewhat normal because it works like a heart to circulate the refrigerant in

the pipes during the refrigerator operation.

● Rattling or metallic touch sound of motor, piston of comp. can be heard when it starts or stops.

9-4. Operation Noise of Refrigerator

9-4-1. Comp. operation Noise

Refrigerator is leveled ?

Front cover or door gasket

is assembled wrong ?

Rubber absorber comp

is distorted or aged ?

Sound from Comp itself

or Vibration ?

69

Start

Attach an absorber gum

on the capillary tube.

N

Y

Apply a gum on the

accumulator.

Y

N

Apply a gum on the

accumulator.

Y

N

Fasten the evaporator in F-

compartment tightly against

touching (liner) surfaces.

N

Y

Explain refrigerator work

mechanism and sound to the

users or customers.

Remarks

● Water flowing sound, hiss or sizzling sound can make while refrigerant in the pipes is changing from

liquid to gas state when comp. starts or stops.
It is normal to the refrigerator.

9-4-2. Refrigerant Flow Sound

Water flowing or hiss sounds

from the refrigerator ?

Refrigerant sound of hiss or

sizzling sound when comp. starts ?

Refrigerant sound of hiss or

sizzling when comp. stops ?

Any shaking sound from

F-compartment

when comp. works ?

70

Troubleshooting of Evaporator Sound

1. Hiss Sound from Capillary Tube

1) “I” tube is used to connect the
capillary tube and evaporator.
(2 welding points : ①, ②)

2. Sizzling Sound from Accumulator

3. Shaking or trembling Sound of Evaporator

1

2

2) When such a sound is made,
attach a absorber on the tube
including 2 welding points.

Attach a absorber on point ③ (accumulator).

1) Check whether evaporator is fastened tight

with the fasteners of ①, ②.

2) Insert a soft spacer (EPS) between left and right wall.
Evaporator not to be shaken or trembled during
refrigerator operation.

1

3

“I” tube

2

71

Remarks

● The fan is sending out cold air to circulate it through the compartments.

When the air is touching the surface of louver or liner wall, such sound can make.

Start

Change the fan.

N

Y

Set it right not to touch.

Y

N

Set it right not to move.

Y

N

Change the motor

assembly.

N

Y

Explain to the customers

how fan is working to

circulate cold air in the

compartments.

9-4-3. Fan Noise

Fan is damaged

or transformed ?

Fan is touching

the surround ?

Fan-motor assembly

is moving or shaking ?

Motor has its own noise

or vibration when working ?

72

2) Check if fan motor and fan are hanged down.
Fan working sound can be louder if they are
not set right.

2. Any Touch Sound from Fan

Troubleshooting of Fan Noise

1. Fixing or Fastening of Fan Motor

1) Check if fan motor frame of the assembly is
fastened tightly with screws to the liner wall.
Unless it is tight, vibration of shaking can make.

1) Check if sealing sponge on the insulator
touches the fan.
If so, set it again not to touch it.

2) If any damage on the insulator around the fan
rotation is found, set the fan motor assembly right
not to touch it.

73

Remarks

● Refrigerant is erupting rapidly from the compressor to circulate pipes, so pipe shaking noise

can make to some degree.

● In case compressor vibration is sent to a pipe directly, apply vibration absorber rubbers to welding

points of the pipe and comp. or to a much bent point on the pipe.

Start

Separate the touching

pipes, if any.

N

Y

Apply cushion material between

Comp. base and Tray drip.

Y

N

Move or change the points of

vibration absorber rubbers on

the pipes to reduce the shaking.

Y

N

Attach a absorber

on the comp. head.

N

Y

Explanation to the users.

9-4-4. Pipe Noise

Pipes are touching

in the machine compartment ?

Tray drip makes

noise by Condenser shaking ?

Pipe itself is

shaking much ?

Compressor itself

is shaking much ?

74

Door switch is soaked with

water or there is water in

the switch ?

PCB input is OK ?

Start

Change the door switch.

N

Y

Repair any disconnection

of wires and defective

Door switch.

Y

Connector insertion to

Main PCB is OK ?

N

Repair the defective

connection.

Y

Door switch itself is

OK ?

N

Change the switch.

N

Y

Check it up.

Door switch is pushed

well ?

Y

Attach a thin pad on the
door liner or change the

door assembly.

Check if interior light is ON.

N

9-5. Door

9-5-1. Door Opening Alarm Continues though the door is closed.

Check #5,6 of CN8 (F-Door)

and #4,6 of CN7 (F-Door).

→ Open : 5V, Close : 0V

75

10-1. Summary of Heavy Repair

* Installation should be conducted in accordance with

the standard installation procedure. (Leave space of
more than 5 cm from the wall for compressor
compartment cooling fan mounted model.)

Transportation

and

installation

* Copper brush, Rag, Tool box

* Remove flux from the silver weld joints with soft

brusher wet rag. (Flux may be the cause of corrosion
and leaks.)

*Clean tools and store them in a clean tool box

or in their place.

Compressor

compartment

and tools

arrangement

* Electronic Leak Detector,

Driver.

* Check leak at weld joints.

Note :Do not use soapy water for check.

* Check cooling capacity

→

Check condenser manually to see if warm.

→

Check hot pipe manually to see if warm.

→

Check frost formation on the whole surface of the

evaporator.

Check

refrigerant leak

and cooling

capacity

* Bombe (mass cylinder),

refrigerant manifold gauge,
electronic scales, punching
off flier, gas welding machine

* Weigh and control the bombe in a vacuum conditions

with electronic scales and charge through compressor

inlet (Process tube).
* Charge while refrigerator operates).
* Weld carefully after inlet pinching.

Refrigerant

charging and

charging

inlet welding

* Vacuum pump

, Manifold gauge.

* Evacuate for more than forty minutes after connecting

manifold gauge hose and vacuum pump to high (drier)
and low (compressor) pressure sides.

Vacuum

* Pipe Cutter, Gas welder,

N2 gas

* Confirm refrigerant (R-134a or R-600a) and oil for

compressor and drier.
* Confirm N2 sealing and packing conditions before use.

Use good one for welding and assembly.
* Weld under nitrogen gas atmosphere.
* Repair in a clean and dry place.

Parts

replacement

and welding

* Nipper, side cutters

* Cut charging pipe ends (Comp. & Dryer) and

discharge refrigerant from drier and compressor.

Remove

refrigerant

Residuals

ToolsContentsProcess

10. COOLING CYCLE HEAVY REPAIR

76

1) Nitrogen only should be used when cleaning inside of cycle pipes
inside and sealing.

2) Check leakage with an electronic leakage tester.

3) Be sure to use a pipe cutter when cutting pipes.

4) Be careful not the water let intrude into the inside of the cycle.

Others.

1) Weld under nitrogen atmosphere in order to prevent oxidation

inside a pipe. (Nitrogen pressure : 0.1~0.2 kg/cm2.)

Nitrogen blowing

welding.

1) Be sure to replace drier when repairing pipes

and injecting refrigerant.

Replacement of drier.

1) Remove retained refrigerant more than 5 minutes after turning off

a refrigerator. (If not, oil will leak inside.)

2) Remove retained refrigerant by cutting first high pressure side

(drier part) with a nipper and then cut low pressure side.
(If the order is not observed, oil leak will happen.)

Removal of retained

refrigerant.

1) Use special parts and tools for R-134a or R-600aUse of tools.

PrecautionsItems

10-2. Precautions During Heavy Repair

Process tube

Compressor

Evaporator

Dryer

High Pressure side

Low pressure

side

Suction tube

Discharge tube

Condenser

Hot Pipe

77

1) Remove residual refrigerant more than 5 minutes later after
turning off the refrigerator. ( If not, compressor oil may leak inside.)

2) Remove retained refrigerant slowly by cutting first high pressure
side (drier part) with a nipper and then cut low pressure side.

1. Removal of residual
refrigerant.

PrecautionsItems

10-3. Practical Work for Heavy Repair

* When replacing a drier:

Weld ①and② parts by blowing nitrogen (0.1~0.2kg/cm2) to high

pressure side after assembling a drier.

* When replacing a compressor:

Weld ③and④ parts by blowing nitrogen to the low pressure side.
Note) For other parts, nitrogen blowing is not necessary because it
does not produce oxidized scales inside pipe because of its short
welding time.

2. Nitrogen blowing
welding.

※※※※ KEYPOINTING

Welding without nitrogen blowing produces oxidized scales inside
a pipe, Which affect on performance and reliability of a product.

Process tube

Compressor

Evaporator

Dryer

High Pressure side

Low pressure

side

Suction tube

Discharge tube

Condenser

Hot Pipe

Process tube

Compressor

Evaporator

Dryer

High Pressure side

Low pressure

side

①

Condenser

②

③

④

Hot Pipe

78

* Pipe Connection

Connect a red hose to the high pressure side and a blue hose
to the low pressure side.

* Vacuum Sequence

Open ①,② valves and evacuate for 40 minutes.
Close valve ①.

3.Vacuum degassing.

PrecautionsItems

* Charging sequence

1) Check the amount of refrigerant supplied to each model after
completing vacuum degassing.

2) Evacuate bombe with a vacuum pump.

3) Measure the amount of refrigerant charged.

- Measure the weight of an evacuated bombe with an electronic scale.

- Charge refrigerant into a bombe and measure the weight. Calculate

the weight of refrigerant charged into the bombe by subtracting the
weight of an evacuated bombe.

4.Refrigerant charging.

Compressor

Evaporator

DryerCondenser

Vaccum

Pump

Hot Pipe

Blue

Yellow

Red

High

Pressure

Low

Pressure

①

②

※※※※ KEYPOINTING

1) If power is applied during vacuum degassing, vacuum degassing
shall be more effective.

2) Operate compressor while charging refrigerant. (It is easier and
more certain to do like this.)

the amount of refrigerant charged

= a weight after charging

- a weight before charging
(a weight of an evacuated cylinder)

Calculation of amount of refrigerant charged

※※※※ KEYPOINTING

1) Be sure to charge
the refrigerant at
around 25°C.

2) Be sure to keep

-5g in the winter
and +5g in summer.

Indicate the weight of

an evacuated bombe

79

PrecautionsItems

4) Refrigerant Charging
Charge refrigerant while operating a compressor as shown above.

5) Pinch a charging pipe with a pinch-off plier after completion of charging.

6) Braze the end of a pinched charging pipe with copper brazer and take
a gas leakage test on the welded parts.

4.Refrigerant charging.

Bombe

Compressor

Evaporator

Condenser

Dryer

Hot Pipe

* Take a leakage test on the welded or suspicious area with an

electronic leakage tester.

5. Gas-leakage test

* Check each pipe is placed in its original place before closing

a cover back-M/C after completion of work.

6. Pipe arrangement
in each cycle

10-4. Standard Regulations for Heavy Repair

1) Observe the safety precautions for gas handling.

2) Use JIG (or wet towel) in order to prevent electric wires from burning during welding.

(In order to prevent insulation break and accident.)

3) The inner case shall be melted and insulation material (polyurethane) shall be burnt

if not cared during welding inner case parts.

4) The copper pipe shall be oxidized by overheating if not cared during welding.

5) Not allow the aluminum pipes to contact to copper pipes. (In order to prevent corrosion.)

6) Make sure that the inner diameter should not be distorted while cutting a capillary tube.

7) Be sure that a suction pipe and a filling tube should not be substituted each other during welding.

( High efficiency pump.)

80

10-5. Brazing Reference Drawings.

▶ Welding Point

●

■

Copper Welding (Ag 5%)

7 Points

3 Points

Silver Welding (Ag 35%)

Hot Pipe

F

R

Evaporator

Condenser

I-Pipe

Accumulator

Suction Pipe

Dryer

Capi-Tube

Pipe Suc Conn

Pipe Conn B

Compressor

▶ Flow of Refrigeration Cycle

Compressor

Pipe Conn. B

Wire-Con. Pipe

Hot Pipe

Dryer

Capillary Tube

Evaporator

Accumulator

Pipe Suction Conn

Suction Pipe

High Low

81

11-1. Installation Preparation

11. INSTALLATION GUIDE

Check if the refrigerator can pass

a doorway or enter a door first.

Dimensions( including Door Handles)

(Width*Depth*Height)

903mm X 734.5mm X 1790mm

Find a suitable place to install

Sufficient space from refrigerator back to the

※wall for free air ventilation

※Avoid direct sunlight.

Once the installation place is ready follow the installation instructions.
If surround temperature of refrigerator is low (below 10℃)),
foods can be frozen or the refrigerator can work in abnormal way.

82

11-2. If the refrigerator can not enter the door

Removing Freezer Door

1

※Remove front bottom cover first, if it is attached.

Remove front bottom cover first,
Pull out the left collar of the

coupling first, then hold the
coupling and pull out the left
water tube.

2

Unscrew top hinge cover with a

screw driver.

Remove the hinge cover.

3

Turn top hinge bolt

counterclockwise .

Disconnect the harness wires.

4

Lift up the front of hinge to remove.
( After the hinge is removed the

door can fall down forward.
Be careful !)

5

Be careful not to damage the

water line when removing the
door.

Removing Refrigerator Door

1

Unscrew top hinge cover with a

screw driver.

Remove the hinge cover.

2

Turn top hinge fastener

counterclockwise.

Disconnect harness wires.

3

Lift up the front of hinge to remove.
(After the hinge is removed the
door can fall down forward.
Be careful !)

4

Lift the door straight up to remove.

83

Replacing Freezer Door

1

Insert the water tube into the hole
Of the bottom hinge pin first, then
Insert the bottom of freezer door
Into the bottom hinge pin.

2

Insert the bottom hole of freezer
door straight to the bottom hinge
pin.

3

Let the top of door close to the
cabinet and insert the top hinge
pin to the top hole of freezer door.
( Insert the back of hinge to the
groove of protrusion first, then
front to the top hole of door.)

4

Turn the hinge fastener tightly to
The end.
Connect harness wire and screw
ground wire.

5

Insert the water tube far into the
coupling.

Replacing Refrigerator Door

1

Insert the bottom hole of
refrigerator door straight to the
bottom hinge pin.

2

Let the top of door close to the
cabinet and insert the top hinge
pin to the top hole of refrigerator
door.
( Insert the back of hinge to the
groove of protrusion first, then
front to the top hole of door.)

3

Turn the hinge fastener tightly to
the end.
Connect harness wirings and
screw ground wire.
Click and screw the top hinge
cover.

84

11-3. Refrigerator Leveling & Door Adjustment

In case freezer door is lower

than refrigerator door

Insert a screw driver (flat tip) into a groove of the

left wheel (bottom of freezer) and turn it clockwise
until the door is balanced.

(clockwise to raise freezer door ;
counterclockwise to lower)

※Refrigerator must be level in order to maintain optimal performance and desirable front appearance.

(If the floor beneath the refrigerator is uneven, freezer and refrigerator doors look unbalanced.)

Insert a screw driver (flat tip) into a groove of the

right wheel (bottom of refrigerator) and turn it
clockwise until the door is balanced.

(clockwise to raise refrigerator door ;
counterclockwise to lower)

The front of refrigerator needs to be higher just a little than the back for easy
door closing, but if the wheel is raised too much for door balance, i.e. front of
refrigerator is too higher than the back, it can be difficult to open the door.

Caution

In case refrigerator door is lower

than refrigerator door

85

11-4. Water Line Installation

1.The water pressure should be 3kgf/cm2 or more to run the
automatic icemaker.

※Checkup your tap water pressure ; if a cup of 180cc is full

within 10 seconds, the pressure is OK.

2.When installing the water tubes, ensure they are not close to
Any hot surface.

3.The water filter only “filters” water ; it does not eliminate any
bacteria or microbes.

4.If the water pressure is not so high to run the icemaker, call the
local plumber to get an additional water pressure pump.

5.The filter life depends on the amount of use. We recommend

you replace the filter at least once every 6months.

※When attaching the filter, place it for easy access (removing

& replacing)

6.After installation of refrigerator and water line system, select

[WATER] on your control panel and press it for 2~3 minutes to

supply water into the water tank and dispense water.

7.Use sealing tape to every connection of pipes/tubes to ensure

there is no water leak.

8.The water tube should be connected to the cold water line.

How to install Water Line

1. Join connector to water tap

Installation Procedure

1)First lock the main tap water valve.
Check if connector B and C has its own rubber packing ring in it.

2)Join Connector C to the water tap, then Connector B to
connector C with a wrench or spanner.

3)Insert water pipe into Connector-B and join Connector-A with a
wrench or spanner.

4)In case Connector-C does not fit water tap join Connector-B
directly to the tap. (See Figure B.)
※If no connector fits water tap, call your local service.

5)Unlock main tap water valve, open tap water and check if any
water leaks on each joins.

Place the rubber washer inside the tap connector and

screw onto the water tap.

2. Get ready to install water line

1) Measure an approximate distance between the filter and the
Water Tube and cut the tube off filter vertically.

2) Connect the tubes to the filter as the figure shows.

Leave a sufficient distance when cutting the tubes.

86

3. Remove any substance from filter

1) Open the main tap water valve and check if water comes out of
the Water Tube.

2) Check if the Water Valve is open in case water does not come out.

3) Leave the valve open until clean water is coming out.
※Initial water may contain some substances out of filter

(manufacturing process).

4. Attach the filter box

1)Screw and fasten the filter holder to the left/right side of the back of
refrigerator.

※In case the holder is not fastened well, remove the back paper

of the tape on the filter holder and attach it.

2)Insert the filter box into the holder.

5. Connect water tube

1)Remove the rear cover at the bottom back of the refrigerator.

2)

Insert the fastening ring into the Water tube.

(Be careful to follow the direction of the nut.)

3)Insert the Water Tube into the top of Water Valve, turn the nut
clockwise to fasten it. (The Water valve is to the right of the motor.)

4)Check for any bent tubes or water leaks; if so, re-check instalation
procedure.

5)Replace the rear cover. (The Water Tube should be placed
between the groove of the refrigerator back and motor cover.)

Set the tube upright as the figure shows.

6. Fasten water tube

1) Fasten the Water Tube with the [Fastener A] .

2) Check if the tube is bent or sqeezed. If so, set it right to

prevent any water leak.

7. After installation

1) Plug the refrigerator, press the [WATER] button on the control

panel for 2~3 minutes to remove any air (bubble) in the pipes
and drain out the initial water.

2) Check the water leak again through the water supply system

(tubes, connectors and pipes) Rearrange the tubes again
and do not move the refrigerator.

87

11-5. Dispenser Water Flow

88

CABINET

12-1. FRS(N)-U20IA

12. EXPLODED VIEW & PARTS LIST

89

MECH ROOM

90

R ROOM

91

F ROOM

92

F DOOR

93

R DOOR

94

REMARK

SPECIFICATION

Q'ty

PART NAME

PART CODE

NO

ABS OD3.17XD1501FAN301183470039

PP1M/BELL A301850020038

PP1M/BELL B301850030037

DC-2213DWCA-31MOTOR C FAN AS301591610036

PP1FIXTURE MOTR301202170035

TSW OD4.76XT0.71PIPE WICON AS301446151034

PE FRB-5970NB

1HOSE DRN B301320171033

PP1CASE VAPORI AS301118130032

DS3-3NORYL S/S1COVER RELAY381140210031

265RHB,3301SWITCH P RELAY AS301812960030

NBR4RUBBER ABSORBER COMP301010160029

SK-5, T0.84SPECIAL WASHER301600250028

MK183Q-L2U1COMP3956183D5027

400VAC 5UF1CAPACITOR RUN301640192026

PAN 4X10 SW BSNI1SCREW MACHINE705140106525

T1 TRS 4X12 MFZN1SCREW TAPPING711240121124

FRU-571I1CORD POWER AS301134670023

T2 M6.5X204SPEICAL BOLT301600330022

FRU-571I1BASE COMP AS301034040021

T2 TRS 4X16 MFZN3SCREW TAPPING714240151120

PP1COVER CAB BRKT301144720019

6X22 SWCH22A(YL)2SPECIAL BOLT *T301600124018

PP2FOOT ADJ AS301210510017

SPCC T3.02BRACKET ADJ FOOT301065720016

6X22 SWCH22A(YL)6SPECIAL BOLT *T301600124015

P/O T5.0 + PAINT1HINGE *U *L AS301292390014

P/O T5.0 + PAINT1HINGE *U *R AS301292400013

T1 TRS 4X12 MFZN4SCREW TAPPING711240121112

PP(V-235)1COVER MAIN PCB BOX301144600011

FRU-571I1PCB MAIN AS30143D606010

T1 TRS 4X12 MFZN2SCREW TAPPING71124012119

PP2CAP CAB COVER30109684008

T1 TRS 4X12 MFZN2SCREW TAPPING71124012117

PP1COVER *T HI *L30114461006

PP1COVER *T HI *R30114462005

6X13 SWCH18A2SPECIAL *T HI BOLT30160423004

PO T3.0+PAINT1HINGE *T *L AS30129243003

PO T3.0+PAINT1HINGE *T *R AS30129244002

FRU-571I1ASSY CAB URT30000577001

95

REMARK

SPECIFICATION

Q'ty

PART NAME

PART CODE

NO

CASE+VINYL1CASE EGG AS301117131078

PP1COVER RETURN DUCT301144590077

W40XT5XL401DEO ANTI AS301870180076

CASE+SILK+FRAME+KNOB1CASE VEGETB C AS301111470075

ABS2GUIDE CASE C *R AS301252980074

ABS2GUIDE CASE C *L AS301252970073

GPPS1COVER VEGETB CASE B301144670072

CASE+SILK+FRAME+KNOB1CASE VEGETB B AS301111460071

FRAME+NUDE GLASS+FIX1SHELF R B AS301784291070

FRAME+NUDE GLASS+FIX1SHELF R C AS301784330069

GPPS1CASE CHILD301118570068

T2S TRS 4X16 MFZN10SCREW TAPPING712240161167

ABS3GUDIE CASE A *R AS301251460066

ABS3GUIDE CASE A *L AS301251450065

FRAME+NUDE GLASS+FIX2SHELF R A AS301784281064

SP201R-7DR1SWITCH LAMP *R301812400063

SM18C2SPECIAL CAP SCREW301600272062

MIPS1WINDOW R LAMP301551080061

T2S PAN 3X82SCREW TAPPING712130081160

AC 240V 25W(S)2LAMP301360250059

250V/1A1SOCKET R LAMP AS301790650058

ABS+SPRAY1COVER R SENSOR301144570057

PBN-43B1SENSOR R AS301480710056

PC-FILM1PLATE INNER CONTROL301457090055

PC-FILM1PANEL INNER CONTROL AS301423520054

PP1COVER DAMP301144440053

F-PS1INSU DAMP AS301335730052

SUS 3041CLAMP FAN301120051051

ABS OD3.17XD1101FAN R301183540050

PP(NATURAL)1FIXTURE MOTOR S1301202380049

PP(NATURAL)1FIXTURE MOTOR S2301202390048

D4612AAA201MOTOR R FAN AS301591600047

NBR2ABSORBER MOTOR301010710046

PP(NATURAL)1FIXTURE MOTOR S3301202370045

FRU-571I1FRAME CHECK VALVE AS301221410044

T1 TRS 4X12 MFZN7SCREW TAPPING711240121143

SBHG T0.351COVER MACH ROOM AS301149700042

C1220T-M OD19.05XL1351DRYER AS301680810041

SUS 3041CLAMP FAN301120050040

96

REMARK

SPECIFICATION

Q'ty

PART NAME

PART CODE

NO

FRU-571I1ASSY F DR URT3000057900110-2

PVC1GASKET F DR AS3012318800110-1

FRU-571I1ASSY F DR3000060400110

HIPS+SILK5POCKET F3019026600109

CASE+SILK+FRAME1CASE F B AS3011114900108

CASE+SILK+FRAME1CASE F A AS3011114800107

PP2CASE ICING3011186300106

FRAME+NUDE GLASS+FIX1SHELF F ICE AS3017842700105

FRAME+NUDE GLASS+FIX3SHELF F AS3017842610104

SP201R-7DL1SWITCH LAMP *L3018124010103

ABS1COVER F SENS3011442600102

PT-381SENSOR F AS3014807000101

SM18C2SPECIAL CAP SCREW3016002720100

MIPS1WINDOW F LAMP301551070099

T1 TRS 4X12 MFZN1SCREW TAPPING711240121198

240V 25W1LAMP301360250097

250V 1A1SOCKET F LAMP AS301790660096

SGCC T0.81PLATE F LAMP301453190095

FRU-571I1COVER F FAN AS300140170094

HIPS2CAP F LOUVER301092460093

T2S TRS 4X16 MFZN1SCREW TAPPING712240161192

HIPS1COVER F RETURN301144320091

HIPS1LOUVER F B AS301892150090

HIPS2CAP F LOUVER B301096860089

T2S TRS 4X16 MFZN3SCREW TAPPING712240161188

SUS 3041CLAMP FAN301120051087

ABS OD3.17XD1301FAN301183450086

ABS1LOUVER F A301892130085

D4612AAA211MOTOR F FAN301591590084

NBR2ABSORBER MOTOR301010710083

HIPS1FIXTURE MOTOR A301200780082

T2S TRS 4X12 MFZN1SCREW TAPPING712240121181

GA1GUIDE DRN301252900080

PP1FIXTURE FUSE TEMP4017Z9059079-5

AC250V 10A 77C1FUSE TEMP AS301720200079-4

PP1FIXTURE D SENS301202360079-3

PBN-431SENSOR D AS301480690079-2

AC220V/ 192W1HEATER SHEATH AS301281830079-1

FRU-571I1EVA AS301705350079

97

REMARK

SPECIFICATION

Q'ty

PART NAME

PART CODE

NO

FRU-571I1ASSY R DR URT3000058000121-2

PVC1GASKET R DR AS3012318900121-1

FRU-571I1ASSY R DR3000060500121

HIPS+SILK2POCKET R *S3019026900120

HIPS+SILK2POCKET R3019026800119

POCKET+COVER1POCKET DAIRY AS3019027500118

ABS+SPRAY1COVER HNDL DECO *U3011446500117

ABS+SPRAY1COVER HNDL DECO *T3011446400116

T1 TRS 4*12 MFZN8SCREW TAPPING7112401211115

HIPS1BASE HANDLE *U3010339600114

HIPS1BASE HANDLE *T3010339500113

WASR+TRS5X16 MFZN2SPECIAL SCREW3016002700112

FRU-571I1HANDLE AS3012641500111

98

CABINET

12-2. FRS(N)-U20DA

99

MECH ROOM