Defrost Mode - Bosch B26FT70SNS Repair Manual

4-4. 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,......... hours.
① Any error mode : R1, F1, u1, FD, rD, F3, r3, RT/S, Door-switch etc.)
2) Defrosting mode starts unconditionally as long as total comp. work time is
20 hours, even if the above conditions 1) are not satisfied.
3) Defrosting mode starts unconditionally as long as comp. continuing work time is
8 hours, even if the above conditions 1) and 2) are not satisfied.
4) 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) and 3) conditions are not
satisfied.
3. In providing initial power (or returning power failure)
If FD-sensor or RD-sensor temp. ≤ 38.3 ℉, defrosting mode starts .
INPUT
CONTENTS
Heater
Defrosting
1) Comp, F/R-ICE/C Fan : OFF
R/Vita Damper : CLOSE
FD/RD Heater : ON
2) Time limit
30 seconds : Heater is ON regardless of D-sensor
temperature right after defrosting start
30 minutes : in case of FD/rD Error
50 minutes : in normal control state
3) If FD-sensor ≥55.4℉, F Heater Defrosting is OFF
If RD-sensor ≥ 55.4℉, R Heater Defrosting is OFF
Pause
Time : 7 minutes
Comp, F/R-ICE/C fan, Damper, Heater etc. : OFF
Fan-Delay
1) Time : 5 minutes
Comp C Fan : ON
F/R-ICE fan, Damper, Heater : OFF
13
CONTROL OBJECT
1. Comp
2. F/R-ICE/C Fan
3. FD/RD Heater
REMARKS