DAEWOO ELECTRONICS FRN-U20IC User manual

Refrigerator
S/M No: RU54957901
- May, 2006
✔ 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
2. EXTERNAL VIEW
2-1. External Size ---------------------------------------------------------------------------3
2-2. Name of Each Parts ------------------------------------------------------------------4
2-3. Cold Air Circulation -------------------------------------------------------------------6
3. SPECIFICATION --------------------------------------------------------------------------7
4. OPERATION AND FUNCTIONS -----------------------------------------------------9
5. DIAGRAM
5-1. Wiring Diagram -----------------------------------------------------------------------32
6. TROUBLE DIAGNOSIS
6-1. Faulty start ----------------------------------------------------------------------------37
6-2. Freezer Compartment --------------------------------------------------------------38
6-3. Refrigerator Compartment ---------------------------------------------------------43
6-4. Operation Noise of Refrigerator --------------------------------------------------48
6-5. Door -------------------------------------------------------------------------------------54
7. COOLING CYCLE HEAVY REPAIR
7-1. Summary of Heavy Repair --------------------------------------------------------55
7-2. Precaution during Heavy Repair -------------------------------------------------56
7-3. Practical Work for Heavy Repair -------------------------------------------------57
7-4. Standard Regulations for Heavy Repair ---------------------------------------59
7-5. Brazing Reference Drawing -------------------------------------------------------60
8. INSTALLATION GUIDE
8-1. Installation Preparation ------------------------------------------------------------ 61
8-2. If the Refrigerator can not enter the Door -------------------------------------62
8-3. Refrigerator Leveling & Door Adjustment -------------------------------------64
8-4. Water Line Installation ------------------------------------------------------------- 65
8-5. Dispenser Water Flow ------------------------------------------------------------- 67
9. COMPONENT LOCATE VIEW -----------------------------------------------------68
10. HOW TO CHECK EACH PARTS
10-1. Hose Ice Maker Tube --------------------------------------------------------------70
10-2. Bracket Geared Motor -------------------------------------------------------------71
10-3. Dispenser Micro Switch -----------------------------------------------------------72
10-4. Dispenser Solenoid Valve --------------------------------------------------------73
10-5. Ice Maker -----------------------------------------------------------------------------74
11. EXPLODED VIEW & PARTS LIST ------------------------------------------------76

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

7
3. SPECIFICATION
3-1. Specification
113kg104kg 115kg
334 Li
170 Li
504 Li
357 Li
184 Li
541Li
FRS(N)-U20FC
339 Li
198 Li
537 Li
361 Li
209 Li
570 Li
FRS(N)-U20BC
C
Y
C
L
EIDΦ0.7 ×T0.55 ×L2200Capillary Tube
Molecular Sieve XH-9Dryer
Fan Cooling SystemCondenser
Fin TypeEvaporator
541 Li570 LiTotal
ISO Gross
Volume
(Li) 184 Li209 LiFreezer
357 Li361 LiRefrigerator
895 mm x 731.5mm x 1790 mm
104kg
339 Li
198 Li
537 Li
FRS(N)- U20IC
External Dimension
(Width x Depth x Height)
Weight
334 LiRefrigerator
170 LiFreezer
504 LiTotal
ISO Storage
Volume
(Li)
FRS(N)-U20DCModel Name
SpecificationItem
※( ) is the specification for the model which use R-600a(refrigerant)
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

8
DC13V / 1100±100 rpm
Condenser
Fan Motor
DC13V / 1950±100 rpmR-Fan Motor
DC13V / 2050±100 rpmF-Fan Motor
E
L
E
C
T
R
I
C
A
L
P
A
R
T
S
Dispenser Model
Specification ( 220~240V Models only )Item
Basic ModelModel Name
AC250V , 10A , 77℃Fuse Temp (Defrost)
PBN-38F-Sensor
D-Sensor
D
E
F
O
R
E
S
T
AC220V / 5W-Water Pipe Heater
AC220V / 5W-Dispenser Heater
AC220V / 8WLouver Heater
H
E
A
T
E
R
SP201R-7DL / SP201R-7DR
(SPF101B-2D / SPF101B-1D)
AC230~240V / 25W (2EA)
AC230~240V / 25W (2EA)
R-Lamp
Door Switch , F / R
F-Lamp
AC250V 15AMain Fuse (Power cord)
AC220V / 7WMain Duct Heater
AC220V / 192WDefrost Heater
PBN-43
PBN-43
R-Sensor

9
4-1. Display
54321Temp indication
Max
Medium
Max
Mid
Medium
Min
MinTemperature Chang
54321Temp 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)-U20IC Type
※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

10
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 : “-19℃”
※Whenever pressing button, setting is repeated in the order of
(-19℃) →(-20℃) →(-21℃)→(-22℃)→(-16℃) →(-17℃) →(-18℃).
INPUT CONTROL OBJECT
CONTENTS REMARKS
Front PCB button
Freezer Set , Refrigerator Set
Super Freeze , Super Cool FCP LED
3. “Super Freeze” Button
When this mode is chosen, the icon (Super Freeze) is ON.
ONFUZZY,DEODOR LED
DialSuper Freeze , Super Cool Icon
Initial mode : Freezer & Refrigerator set
→Normal (-19℃/4℃)
88 Display (Set Temp.)
ControlFCP-LED
-19℃
(Normal)
Initially
On
-22℃
(Max)
3th
Press
-16℃
(Min)
4th
Press
-18℃
6th
Press
-17℃-21℃-20℃
Temp
indication
5th
Press
2nd
Press
1st
Press
Temperature
Change
4-1-2. FRS(N)-U20BC Type
Letters are indicated on 88 Display LED
Temperature adjustment button
for freezer compartment.
Super freeze
Temperature adjustment button
for refrigerator compartment.
Super Cool
4. “Refrigerator Set” button.
1) Temperature control of Refrigerator compartment
2) 7 step mode of successive temperature mode.
3) Initial mode by power input : “4℃”
※Whenever pressing button, setting is repeated in the order of
(4℃) →(3℃) →(2℃) →(8℃) →(7℃) →(6℃) →(5℃).
3℃
1st
Press
4℃
(Normal)
Initially
On
2℃
(Max)
2nd
Press
8℃
(Min)
3th
Press
5℃6℃7℃
Temp
indication
6th
Press
5th
Press
4th
Press
Temperature
Change
Letters are indicated on 88 Display LED
5. “Super Cool” button.
When this mode is chosen, the icon (Super Cool) is ON.

11
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
4-1-3. Dispenser Model
Temperature adjustment button
for freezer compartment.
Super freezer Temperature adjustment button
for refrigerator compartment.
Super Refrigerator
Lock buttonWater filter reset Dispenser select button Ice maker lock button
Letters are indicated on 88 Display LED

12
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
①Push 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
②Press 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.

13
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
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.
①Comp. operating rate : more 85%
②Total door open time : 2 minutes
(Any door, F or R open time is over 2 minutes.)
③Any 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 .

14
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?
EndDefrosting 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

15
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
Push “REF.TEMP (Set)” button 5 times while pushing “FRZ.TEMP (Set)” button simultaneously.
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. (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 )

16
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. 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.)
INPUT CONTROL OBJECT
CONTENTS REMARKS
1. Refrigerator door switch
2. Freezer door switch Lamp
4-6. Control of Interior Lights

17
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
“Freezer LED” and “Refrigerator 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
4-7-1. FRS(N)-U20IC Type
4-7. Demonstration
1. Start
Push “SUPER REF.” button 5 times while pushing “REF. 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) Display control
“Freezer LED” and “Refrigerator LED” are ON in good order
3. Stop
1) During Demo mode, push “SUPER REF” button 5 times
while pushing “REF. SET” button simultaneously.
2) Power in again
INPUT CONTROL OBJECT
CONTENTS REMARKS
1. FRZ. SET
2. Door Switch
Comp
F/R-Fan
Heater
4-7-2. FRS(N)-U20BC Type

18
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
4-7-3. Dispenser Model

19
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
Main PCB Resistance of R-sensor
ON/OFF Temp. of Refrigerator
※R-SENSOR standard resistance in normal mode (31.4K)
(1) In case of weak ref., cut J1 (or J18) to down the standard resistance by 1.5deg(2K)
(2) In case of weak ref., cut J2 (or J19) to down the standard resistance by 1.5deg(2K)
4-8. Compensation of R-sensor ON/OFF Temp.
FRS(N)-U20IC
R-SENSOR
J2
R36
R37
R38 J1
J2
J1
cut--J2 cutcut-J1
FRS(N)-U20BC
Temperature
compensation
cut--J2 cutcut-J1
FRS(N)-U20IC
FRS(N)-U20DC/FC
3℃ -1.5℃ 0℃
cut--J19 cutcut-J18
M
o
d
e
l
FRS(N)-U20BC
R-SENSOR
J2
R35
R36
R37 J1
J1
J2
FRS(N)-U20DC/FC
R-SENSOR
J19
R36
R37
R38 J18
J18,19