Daewoo Frs 2021 Service Manual

							 
SILENT (Silence Mode) INPUT
  Control Object
  1. CDS SENSOR
  5.
 COMP  
6.  R -FAN  
7.  F -FAN  
8.  CUSTOM -LCD   CONTENTS
  REMARKS
   
1.
 Purpose of Silence mode   
To reduce refrigerator noise at night by decresing fan RPM to a minimum d\
egree  
   
2.  Condition  to start 
 1)  The optical o r light sensor in top middle of control panel senses surround light and \
Silence mode starts if the amount of light sensed is below the standard \
value for 
more than 1 minute.  
( The mode does not start for initial 240 minutes to prevent down of cooli\
ng 
perfor mance.)  
 a. Standard value to decide ‘night’ : below 5~ 7 Lux (optical sensor surface) 
 b. Standard value to decide ‘daytime’  : above 4~16 Lux  
 (optical sensor surface)
 
 
3.  Control Method  
Control Mode  F-FAN   R-FAN   C-FAN   Normal   10V
  10V  10V  Silence  
Load
 
Control   12V
  12V  10V   
 
4. 
Termination Condition  
The mode stops if lux value is above the standard for more than 1 minute\
.  
   
 
Control of Each Mode INPUT
  Control Object
  1.
 CDS SENSOR  
2.  R SENSOR  
3.  F SENSOR        1. F
-FAN (14V, 12V, 10V)   CONTENTS
  REMARKS
   
*  Control of Silence mode : operation mode when the optical sensor feels that it is 

night  
 
* Normal control : daytime operation mode  
 (Refrigerator noise is relatively low at daytime.)
 
* Load control  : operation mode when inside temperature goes up due to an 
increase of load
 ( foods ) or frequent door openings  
    
 
 
 
   
 
 
   
 
 
 
 
 
 
 
 
 
 
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CO NTE N TS R EM ARKS 
 
1. F an  volt a g e o f e ach  c o ntr o l  m ode 
 
2. C ontr o l  a gain st  ( u nder) lo ad ( L oad C ontr o l) 
1 ) P urp o se : To  re sto re  F /R-te m pera tu re  w hic h  h a s ris e n b y lo a d (m uch  fo od s in  o r 
fr e qu en t  d oo r o pen in gs) a s s o o n a s p ossib le 
 
2 ) Dis p la y :   S PEED  lig hts  u ntil  t h e m ode a nd s p eed ic o n s flic ker. 
 
3 ) C ondit io ns to  s ta rt ( fr o m  b oth  N orm al  a nd S ile nce) 
 a .   F  o r R  d o or o p en tim e e xce ed s 3 0 s e co n ds a t  a  tim e - >  F re e ze r a nd  R efr e ge ra to r   
 
 
lo ad c o ntr o l  s ta rts  r e sp ectiv e ly .
b . O ve r [F-s e nso r O n P oin t +  5b .   d eg re e] - >  F
 
lo a d c o ntr o l 
c. O ve r [R-s e nso r O n P oin t +  5 d egre e] - > R lo ad  c o n tr o l 
 
4 ) C ond it io n s t o  a vo id  lo ad  c o ntr o l 
 a . In it ia l  o pera tio n ( ru ght a fte r p ow er in put)  o f r e fr ig era to r 
 b . Ju st  a ft e r P re-co ol,   He ate r d efr o sting,  P ause , D efr o stin g  c ycle 
 
5 ) C ontr o l  M eth od 
5-1 ) C ontr o l  m ode  b y F /R-d oor o pen t im e (o ve r 3 0 s e co nd s) 
 -> F /R-fa n w ork s b y 1 4 V r e sp ectiv e ly. 
5-2 ) C ontr o l  m od e b y [F-se n so r O n P oin t +  5 d egre e ] 
   -> F-fa n w ork s b y 1 4V. 
5-3) C ontr o l  m od e b y [R-se n so r O n P oin t +  5 d egre e] 
   -> R-fa n w ork s b y 14V. 
  * C-fa n w ork s b y 10V a s n o rm al. 
 
6 ) C on dit io ns to  sto p 
a. T he m ode w ork s fo r 2 0 m in ute s.  
  (If a noth er c o ndit io n h appens a t th e e nd o f th e m ode, it  s ta rts  a gain .) 
 b . W hen it  r e ach es to  [F-senso r O ff p oin t],  F-fa n lo ad  c o n tr o l  m ode  s to ps. 
 c . W hen it  r e ach es to  [R-se nso r O ff p oin t],  R-fa n lo ad  c o ntr o l  m ode s to ps. 
C ontr o l  M od e F-F A N R-FA N C-FA N 
N orm al 12 V 12V 
N orm al 14 V 14V Loa d C on tr o l S ile n ce 1 2 V 12V 
S ile n ce N orm al 10 V 10V 
N orm al 10 V 10V S le e p M od e2 L o ad c o ntr o l 12 V 12V 
10V 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
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CONTENTS
  REMARKS
   
3. 
Control  Time Chart  of Each  Mode  
   1)  Start & stop of load control mode (Normal Control)  Door
F/S
F Fan
R/S
R Fan Door Open
30 sec. after Open
Load Mode Start Frz. Load Stop Rez. Load Stop On + 5deg
On + 5deg Frz. Overload Input
Frz. Start Condition Frz. Stop ; 
after 20min. 20min.
20min. Ref. Load14V
14V
12V
12V   
2) 
Start & stop of load control mode (Silence Control)  Door
F/S
F Fan
R/S
R Fan Door Open
30sec. after openLoad Mode StartRef. Load StopFrz. Load Stop On + 5deg
On + 5deg
Frz. Overload InputFrz. Load Start
Frz. Stop Condition ; 
 after 20min.20min.
20min.
Ref. Load 12V
12V
10V
8V     
 
 
3)  Start &  stop of load control mode (Normal defrosting control)  F/S
F Fan R/S
R Fan
Defrosting StartCondition to start Load 
Mode, but avoided 
buring defrosting modeRef. Load Stop On + 5deg
Normal Operation
20min.
Ref. Load Mode
14V
12V
8V
HTR
Comp  
 
   
 
 
 
   
 
 
 
 
 
 
 
 
 
 
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CONTENTS
  REMARKS
   
4. 
Flow Chart of Load Control Mode  
 
  Sart
F/R door open time is over 30 sec. ?
F/S ON + 5deg?
R-sensor ON + 5deg?Fan RPM
      F Fan : 12V
      R Fan : 12V
      C Fan : 10V Fan RPM
          Normal    Overload
F Fan :  10V         12V
R Fan :  10V         12V
C Fan :  10V         12V Overload of both
compartments Y
N
Freezer
Compartment Overload Refrigerator
Compartment
Overload Y
N
Y
N
F load control ;
over 20 min. ? F-sensor OFF point ?Overload mode control Overload mode ?
Normal mode
control N
F load control mode stop
R-sensor OFF point ? R load control mode
stop EndLoad control is avoided ?
N Y
R load control ;
over 20 min. ? Y
Y
YN
Y
N
N
Y
NControl Mode
Normal 240 minutes ?N
Silence
 
   
 
   
 
 
   
 
 
 
 
 
 
 
 
 
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Defrosting Cycle INPUT
  Control Object
  1. 
 Total comp.  work time  
2.   Comp.  work rate  
3.   RT  temperature  
4.   Total door open time   1. 
Defrosting Mode   CONTENTS
 
REMARKS  
1. 
Conditions to start  defrosting cycle 
  1)   Total comp. work time  : 6, 8, 10 hours 
  2)   C omp. work rate  (by the 2 hours ) :  over  65% 
  3)   Total door open time  : 3 minutes   
(Any door  - F or R  – open time is over 3 minutes.)  
  4)   Total time of [comp.  ON + comp.  OFF]  : 60  hours  
  5)
 
  Ambient temperature
 :
 
 over 
3
5C 
   6) 
Any error mode  : R1, F1, D1, F3, RT/S, Door -switch  
 
 2.  Conditions to start defrosting mode   
1)  The mode starts in the following conditions ;  
a. Any error happens when total comp. work time is 6 or 8 or 10 hours. 
b. Comp. work rate by the 2 hours is over 65%. 
 c. Total door open time is over 3 minutes.  
 (Any door 
- F or R  – open time is over 3 minutes.)  
d. Ambient temperature is over 35C 
2)
 Defrosting mode starts unconditionally as long as total comp. work time\
 is 10 hours,   
even if the above conditions
 (a~d  ) 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 satisfie\
d.   
 
 
 
 
 
 
 
 
 
 
 
   
 
 
   
 
 
 
 
 
 
 
 
 
 
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CONTENTS
  REMARKS
   
3. 
Flow Chart of Defrosting Start  
  Start
Ambient temp. is over 35C ?Comp. work time is over 10 hours ? Total time is over 60 hours ?
Comp. work time is over 6 hours ?
Any error ?Comp. work rate is over 65 % ?
EndDefrosting mode starts. Yes
Yes
Yes
Yes
Yes
Yes No
No
No
No NoNo
Comp. work time is over 2 hours ?
Total door open time is over 3
minutes ? YesYes
No
NoComp. work time is over 8 hours ? No
No
 
     
 
 
 
   
 
 
 
 
 
 
 
 
 
 
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Defrosting Mode INPUT
  Control Object
  1. 
Defrosting Cycle   1. COMP
 
2. F -FAN  
3. R -FAN  
4. HEATER   CONTENTS
  REMARKS
   
1. 
Defrosting Mode  
  1) Time ; 50 minutes  
2) C omp. /  F-fan :  ON 
R -fan  : Control  
H eater : OFF  
3)  If F
-
 senso
r < - 27C, PRE-COOL becomes OFF. 

 
 

                        
 
 1) 
If D-
sensor > 10C, Heater becomes OFF. 
 2) 
In case of Heater return by time limit of  40 or  80 min  
(F3 -E rror ) 
3)  Heater is ON for 30 minutes (time limit) in case of  D-
sensor error.  
4)  Time limit  
 a. 30 seconds : Heater is ON regardless of D-sensor 
 temperature right after defrosting start.
 
 b. 30 minutes : in case of D1-Error 
 c. 80 minutes : in normal control state 
  
1) 
Time : 7 minutes  
C omp.,  F-fan,  R-fan , Heater :  OFF 
 
 
1)  Time :  5 minutes  
C omp. :  ON 
F/R -fan, Heater : OFF  
 
* Output control and time limit of each defrosting mode 
  
  PRE
-COOL   H
eater Defrosting   Pause
  F
an  Delay
  COMP
  ON  OFF  OFF  ON  F
-FAN   ON  OFF  OFF  OFF  R
-FAN   Control  OFF  OFF  OFF  HEATER
 OFF  ON  OFF  OFF  Time Limit   50
 min.  
a. 80 min. 
b. 30 min. 
 (
in case of  D1-E rror )   7
 min.   5 min.    
C-fan and comp. 
are linked.    
 
 2.  Initial Defrosting   
If 
 D
-s
ensor < 3.5C, defrosting mode starts from Pre-Cool at initial power input or 
 first plugin.
    
 
 
 
 
 
 
  Pre - Cool  
Heater
 
Defrosting   Pause
  Fan Delay  
 
 
 
   
 
 
 
 
 
 
 
 
 
 
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Error Display (LCD Display of F-PCB) 
 
 
 
 
 
 
 
  INPUT
  Control Object
  1.
 Temperature Control Buttons  CUSTOM LCD  CONTEN
TS  REMARKS  
 
1. 
How  to start  
1)  Set   “LOCK ON ” first.  
2) Push  “LOCK ” button 3 times while pushing  “REF SET. ” button  at the same time . 
 
2.  Display   
E rror code is displayed on Freezer temperature display part.  
 
3.  How to stop  
1)  Push  “LOCK ” button 3 times w hile pushing “REF SET. ” button . 
2)  It stops automatically 4 minutes after the start.  
 
4.  All the error Ccdes are reset if they turn to be normal.  
   
5. Error Code  
   
 ERROR CODE
  CONTENTS
  F1
  F-sensor  ; disconnection, short(pull -down)   r1
  R-sensor  ; disconnection, short(pull -down)    rt
  RT-sensor  ; disconnection, short(pull -down)   d1
  D-sensor  ;  disconnection, short(pull -down)   dr
  R-Door  Switch ; defective   dF
  F-Door  Switch ; defective   dH
  Homebar (Refreshment Center)  Door Switch ; defecti ve  C1
  Cycle ; abnormal or defective.   F3
  Return after defrosting ; abnormal or defective  d2
  Forced defrosting mode for A/S    
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
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CONTENTS
  REMARKS
   
6. 
 Control  Way of Errors (if any)  
 
 1) F1 ERROR      a. Cause : F-sensor disconnection / short (pull-down) 
   b. Control : Comp. / F-fan -> ON for 25min., OFF for 25min.           
   c. if F-sensor is normal, the error is terminated automatically. 
  
 2) r1 ERROR
 
   a. Cause : R-sensor disconnection / short (pull-down) 
   b. Control  : Condition of ambient temperature 
 RT/S
 
 I
n  ERROR Work rate 
ON/OFF  
8 / 12 
7 / 13  8 / 12  8 / 12 9 / 11 
   c. If R-sensor is normal, the error is terminated automatically. 
  
 
3) rt ERROR  
   a. Cause : RT-sensor disconnection / short (pull-down) 
   b. Control : Normal operation, deletion of control condition by RT-sensor 
   c. If RT-sensor is normal, the error is terminated automatically. 
  
 
4) d1 ERROR  
   a. Cause : D-sensor disconnection / short (pull-down)  
   b. Control : Time limit (30min.) of defrosting-return 
   c. If D-sensor is normal, the error is terminated automatically. 
  
 
5) D oor ERROR(dF,dR,dH  on display)  
   a. Cause : in case it senses that door is open for more than 1  
  b. Control  : Deletion of function related door switch sensing 
   c. If door switch (open & close) is sensed, the error is terminated autom\
atically. 
   d. After displaying on LCD the mode is terminated. 
  
 
6) C1 ERROR  
  a. Cause : in case comp. works for over 3 hours when D-sensor temp. is over -5C 
   b. Control : Normal operation 
   c. When D-sensor temp. is below -5C in comp. OFF, it is terminated. 
  
 
7) F3 ERROR  
   a. Cause : in case defrosting-return is done by time limit of 80min. 
   b. Control : Deletion of Pre-cool mode in defrosting mode 
   c. If defrosting-return is done by D-sensor, it is terminated. 
  
8) d2 MODE 
(A/S  forced defrosting mode)  
  a. Set “LOCK ON” first, then push “REF SET.”  button 5 times while pushing “FRZ SET.” 
 button
 simultaneously . 
  b.  Control : A/S forced defrosting control (Pre-cool is deleted.) 
  c. If D-sensor temp. is over 10C, the mode is terminated  automatically. 
  
 
   
 
 
   
 
 
 
 
 
 
 
 
 
 
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~ 13C          14 ~ 19C          20 ~ 29C          29C ~ 
 
						

							 
Forced Defrosting INPUT
  Control Object
  1.
 “ FRZ SET. ” button  
2.  “ REF SET. ” button  
3.  “ LOCK ” button   Defrosting Mode
  CONTENTS
  REMARKS
  1. 
 How to start  
-> Set “LOCK ON” first, then push “REF SET.”  button 5 times while 
 pushing 
“FRZ SET. ” button  simultaneously . 
 
2.   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)     
6
-11 . Initial Defrosting   INPUT
  Control Object
  D
-sensor  
Initial or first power input (power plugin)  Defrosting Mode
  CONTENTS
  REMARKS
 
If 
 D
-sensor temp.
 < 3.5C, defrosting mode starts from Pre-cool at first 
 power input.
  Comp. is delayed for 6 min. 
at the init ial defrosting.    
6
-12. B uzzer or Alarm   INPUT
  Control Object
  F
-PCB  buttons  
Door Switch  
Initial Power Input   BUZZER
  CONTENTS
  REMARKS
  1. 
 Buzzer sounds if any button of  F-PCB  is pushed.  
2.   Buzzer sounds 3 times 3 minutes after initial power input.  
3.   Buz zer sounds for 1 second in case of  A/S forced defrosting, short (pull -
down) operation, explanation mode.   
4 .   If door is open, buzzer sounds  continually 3 times for 5 seconds.  
    (Door open alarm)    
 
LCD Background Light INPUT
  Control Object
  F
-PCB  buttons 
Door Switch  
Initial Power Input   LCD BACK LIGHT
  
   
 
 
   
 
 
 
 
 
 
 
 
 
 
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