Daewoo FRU-5711-FRS-U20DA Series Service Manual page 17

4-2. Defrost Mode
1. Defrosting Cycle
1. Defrost Mode
Pre-Cool
Heater
Defrosting
Pause
Fan-Delay
2.The defrost mode start with the following conditions
1) Total operation time of comp. becomes : 6,8,10,......... 24 hours.
① Comp. operating rate : more 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
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 .
INPUT
CONTENTS
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
1) Time : 5 minutes
Comp : ON and F-fan, R-fan, Heater : OFF
16
CONTROL OBJECT
1. Comp
2. F-Fan
3. R-Fan
4. D-Heater
REMARKS