Bosch B20CS50 Series Service Manual page 12

4-2. Defrost Mode
1. Defrosting Cycle
1. Defrost Mode
Heater
Defrosting
Pause
Fan-Delay
2.The defrost mode start with the following conditions
1) Total operation time of comp. becomes : 6,8,10,.........,12 hours.
① Room Temperature ＜ 35℃ & Comp. operating rate ≥ 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
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 .
INPUT
CONTENTS
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
11
CONTROL OBJECT
1. Comp
2. F-Fan
3. R-Fan
4. D-Heater
REMARKS