Bosch B20CS50 Series User manual

1
C O N T E N T S
1. WARNINGS AND PRECAUTIONS FOR SAFETY --------------------------------------------
2. EXTERNAL VIEW
2-1. External Size ----------------------------------------------------------------------------------------
2-2. Name of Each Parts --------------------------------------------------------------------------------
2-3. Cold Air Circulation --------------------------------------------------------------------------------
3. SPECIFICATION --------------------------------------------------------------------------------------
4. OPERATION AND FUNCTIONS -------------------------------------------------------------------
5. WIRING DIAGRAM ------------------------------------------------------------------------------------
6. COMPONENT LOCATE VIEW --------------------------------------------------------------------
7. HOW TO CHECK EACH PARTS
7-1. Hose Ice Maker Tube ------------------------------------------------------------------------------
7-2. Bracket Geared Motor ------------------------------------------------------------------------------
7-3. Dispenser Micro Switch ----------------------------------------------------------------------------
7-4. Dispenser Solenoid Valve -------------------------------------------------------------------------
7-5. Main PCB ----------------------------------------------------------------------------------------------
7-6. Ice Maker ----------------------------------------------------------------------------------------------
8. TROUBLE DIAGNOSIS
8-1. Power Failure -----------------------------------------------------------------------------------------
8-2. Freezer Compartment ------------------------------------------------------------------------------
8-3. Refrigerator Compartment -------------------------------------------------------------------------
8-4. Operation Noise of Refrigerator ------------------------------------------------------------------
8-5. Door -----------------------------------------------------------------------------------------------------
8-6. Adjusting F/R Door Balance -----------------------------------------------------------------------
9. COOLING CYCLE HEAVY REPAIR
9-1. Summary of Heavy Repair ------------------------------------------------------------------------
9-2. Precaution during Heavy Repair -----------------------------------------------------------------
9-3. Practical Work for Heavy Repair -----------------------------------------------------------------
9-4. Standard Regulations for Heavy Repair --------------------------------------------------------
9-5. Brazing Reference Drawing -----------------------------------------------------------------------
10. INSTALLATION GUIDE
10-1. Installation Preparation ---------------------------------------------------------------------------
10-2. If the Refrigerator can not enter the Door ----------------------------------------------------
10-3. Refrigerator Leveling & Door Adjustment ----------------------------------------------------
10-4. Water Line Installation ----------------------------------------------------------------------------
10-5. Dispenser Water Flow -----------------------------------------------------------------------------
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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
them selves.
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

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12. Refrigerator pocket6. Freezer case
7. Water Filter1. Ice cubes storage case
13. Refrigerator case
11. Movable Egg case5. Freezer pocket
10. Refrigerator shelf4. Freezer shelf
9. Refrigerator light3. Water/Ice Dispenser
8. Dairy pocket2. Freezer light
Refrigerator CompartmentFreezer Compartment
(Model : B20CS50SN* )
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10
11
12
13
7
1
2
4
3
5
6
2-2. Name of Each Parts
8

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14. Refrigerator pocket
13. Refrigerator case
12. Movable egg Tray6. Freezer case
7. Water Filter1. Ice cubes storage case
15. Magic cool zone
11. Refrigerator shelf5. Freezer pocket
10. Shelf wire4. Freezer shelf
9. Refrigerator light3. Water/Ice Dispenser
8. Dairy pocket2. Freezer light
Refrigerator CompartmentFreezer Compartment
(Model : B20CS80SN*)
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14
15
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2
4
3
5
6
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13
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8

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Freezer
Compartment Refrigerator Compartment
2-3. Cold Air Circulation

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3. SPECIFICATION
115kg
B20CS80SN*B20CS50SN*
113kg
355 Li (12.53 ft3)
212 Li (7.48 ft3)
567 Li (20.01 ft3)
360 Li (12.71 ft3)
212 Li (7.48 ft3)
572Li (20.19 ft3)
190gQuantity
4TM445KFBYY-53
Model
Name
O.L.P
Resistance :4.7Ω
Vmax / Imax : 180V / 12A
Spec
8EA14C3 (Texas Instruments)
Model
Name
PTC
250VAC / 12uFRunning Capacitor
RSCRMotor Type
EGZS80HLPModel
Comp
C
O
O
L
I
N
G
ID0.7 * T0.55 * L2200Capillary Tube
Molecular Sieve XH-9Dryer
Fan Cooling SystemCondenser
Fin TypeEvaporator
R-134aRefrigerant
61℃/ 105℃
Close/Open
Temp
Weight
115~120V (60Hz)
903mm * 734.5mm *1790mm
Rated Voltage
External Dimension
(Width * Depth * Height)
Refrigerator
Freezer
Total
Gross
Volume
(Li)
Model Name
SpecificationItem

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PBN-43B
PBN-43BRefrigerator
AC120V / 15W (1EA)
Dispenser
-Lamp
B20CS80SN*B20CS50SN*Model Name
AC110V / 5WWater Pipe
D4612AAA22 / DC13V / 1100±100 rpm
Condenser
-Fan Motor
D4612AAA20 / DC13V / 1850±100 rpm
Refrigerator
-Fan Motor
D4612AAA21 / DC13V / 2050±100 rpm
Freezer
-Fan Motor
E
L
E
C
T
R
I
C
A
L
P
A
R
T
S
SpecificationItem
AC250V , 10A , 77℃Fuse Temp (Defrost)
PT-38Freezer
Defrost
S
E
N
S
O
R
AC110V / 5WDispenser Box
H
E
A
T
E
R
SP201R-7DL / SP201R-7DR
AC125V / 25W (2EA)
AC125V / 25W (2EA)
Refrigerator
-Lamp
Door Switch
(Freezer / Refrigerator)
Freezer
-Lamp
AC125V 15APower cord
AC110V / 7WMain Duct
AC115V / 192WDefrost
-
PBN-43
Magic Cool Zone

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Temperature adjustment button
for freezer compartment.
Super freeze
Temperature adjustment button
for refrigerator compartment.
Super Cool
Lock buttonWater filter reset Dispenser select button Ice maker lock button
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 : “0℉”
※Whenever pressing button, setting is repeated in the order of
(0℉) →(-2℉) →(-4℉)→(-6) →(6℉) →(4℉) →(2℉).
INPUT CONTROL OBJECT
CONTENTS REMARKS
Front PCB button
Freezer Set , Refrigerator Set
Super Freeze , Super Cool
Water Filter Reset , Dispenser , Ice Maker Lock
,Lock
FCP C-LED
3. “Super Freeze” Button
When this mode is chosen, the icon (Super Freeze) is ON.
RefrigeratorFreezer
4℃/ 39℉-18℃/ 0℉
After six month, LED ONWater Filter Change Icon
DialIce Maker Lock Icon
DialLock Icon
DialWater / Cubed Ice / Crushed Ice Icon
DialSuper Freeze , Super Cool Icon
Initial mode
(Normal)
88 Display (Set Temp.)
ControlFCP-LED
2℉4℉6℉-6℉-4℉-2℉0℉
-18℃
power
input
(normal)
-21℃
3th
Press
(max)
-15℃
4th
Press
(min)
-17℃
6th
Press
-16℃-20℃-19℃
Temp
indication
5th
Press
2nd
Press
1st
Press
Temperature
Change
Letters are indicated on 88 Display LED
4-1. Display
4. OPERATION AND FUNCTIONS
Reference
※Initial power input display
⇒Fahrenheit degree “ ℉”
※To change display for Celsius degree (℃)
or Fahrenheit degree (℉)
⇒Push “Water Filter Reset” button 15 seconds,
in “Lock” condition

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CONTENTS REMARKS
4. “Refrigerator Set” button.
1) Temperature control of Refrigerator compartment
2) 7 step mode of successive temperature mode.
3) Initial mode by power input : “39℉”
※Whenever pressing button, setting is repeated in the order of
(39℉) →(37℉) →(35℉) →(33℉) →(45℉) →(43℉) →(41℉).
5. “Super Cool” button.
When this mode is chosen, the icon (Super Cool) is ON.
6. “Dispenser” button
1) Select Water / Crushed Ice / Cubed Ice .
2) Icon lights up to show your selection is on.
Initial mode by power input : “Water” mode.
3) The mode of Crushed Ice or Cubed 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. “Water Filter Reset” button
1) The normal (Icon OFF) is on for 6 month after are first power input.
2) After six months, icon is ON.
3) How to reset Filter information
①Push the “Water Filter Reset” 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.
41℉43℉45℉33℉35℉37℉39℉
4℃
power
input
(normal)
1℃
3th
Press
(max)
7℃
4th
Press
(min)
5℃
6th
Press
6℃2℃3℃
Temp
indication
5th
Press
2nd
Press
1st
Press
Temperature
Change

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1. Defrost Mode
INPUT CONTROL OBJECT
CONTENTS REMARKS
1. Defrosting Cycle 1. Comp
2. F-Fan
3. R-Fan
4. D-Heater
Pause
Fan-Delay
Heater
Defrosting
Heater
Defrosting
1) Comp, F-fan, R-fan : OFF
Defrost-Heater : 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,………,12 hours.
①Room Temperature ＜35℃& Comp. operating rate ≥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
12 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 .

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CONTENTS REMARKS
4. Flow Chart of Defrosting Start Start
Comp. operating time
is over 12 hours?
Total time is
over 60 hours?
Comp. operating time
is over 6 hours?
EndDefrosting start
Comp. operating time
is over 2 hours?
Comp. operating rate
is more 85%?
NO
YES
NO
NO
YES
Total door open
time is over 2 min?
YES
YES
YES
YES
NO
NO
NO
Room Temp.
≥35℃
NO
Any error ?
YES
NO
YES

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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-Heater : 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
; In “Lock” mode, push “Refrigerator Set” button 5 times while pushing “Freezer Set”
button simultaneously.
3. How to proceed
1) 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
CondenserRefrigeratorFreezerFAN
4-4. Fan Voltage of Control Mode

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It is linked with comp.
INPUT CONTROL OBJECT
CONTENTS REMARKS
1. Comp Dispenser Heater
Ice Flap Heater
1. Buzzer sounds if any button of Front-PCB button 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 Front-PCB buttons
2. Door Switch
3. Initial Power Input Buzzer
4-5. Dispenser and Flap 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
3. Dispenser lamp control
Dispenser lamp turns ON/OFF by Dispenser switch.
Dispenser lamp turns ON for 5 seconds after sensing switch close.
INPUT CONTROL OBJECT
CONTENTS REMARKS
1. Refrigerator door switch
2. Freezer door switch
3. Dispenser switch
Lamp
4-7. Control of Interior Lights

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4-8. Demonstration
1. Start
Push “Dispenser” 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 “Dispenser” button 5 times while pushing “Freezer Set”
button simultaneously.
2) Power in again
INPUT CONTROL OBJECT
CONTENTS REMARKS
1. “Freezer Set , Dispenser” button Comp
F/R-Fan
Heater

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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
ON/OFF Temp. of Refrigerator
R36 : R-SENSOR standard resistance in normal mode (31.4㏀)
In case of weak ref.
1) Cut J18 to increase the standard resistance by 2㏀⇒1.5℃down
2) Cut J18 & J19 to increase the standard resistance by 4㏀⇒3℃down
4-9. Compensation of R-sensor ON/OFF Temp.
R-SENSOR
J19
R36
(31.4㏀)
R37
(2㏀)
R38
(2㏀)J18
J18,19
R36+R37+R38R36R36+R37R36
3℃ 0℃ -1.5℃ 0℃
Temperature
compensation
(31.4+2+2)㏀ 31.4㏀ (31.4+2)㏀ 31.4㏀
Resistance
cutcut--J19
cut-cut-J18

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1. How to start
1) Under “Lock” mode, press “Super Freeze” button 5 times while pressing
“Freezer Set” button at the same time.
2) The front C-LED 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.
①Time
②F-Sensor temperature
③D-Sensor temperature
④R-Sensor temperature
⑤RT-Sensor temperature
⑥P Factor display (Refer to water supply mode of automatic icemaker)
⑦Filter remaining time until change (First check ; 4,320Hr)
Refer to Filter Information Reset of C-LED 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. Error Display

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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.
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.
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.
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.
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 13℃, the mode is terminated automatically.
Refer to the 4-3. .
5. Control way of Error (if any)

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9) “EI”ERROR
Cause : I-SENSOR disconnection / short
Check point : Measure the resistance between both terminals after separating CN11
of the Main PCB.
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