Daewoo FR-420N Service Manual page 13

3. Defrost Mode
INPUT
Total COMP Work Time / COMP Working Rate
Total Door Open Time / RT
Initial Defrost
A. When initial power input or returning power failure.
if the temperature at the Defrost Sensor is below 3.5 C, Defrost Mode starts.
( It prceeds from 'PRE-COOL' ), [ PRE-COOL - Heater On - Pause (10min) - Normal Operation ]
B. Initial defrost mode starts after 'Prevention of Compressor Restart'. ( Refer to function No. 5 )
Defrost Start
Flow Chart of
Yes
Yes
Yes
Defrosting Start
Comp time >= 2 hours
Total time >= 60 hours
Comp time >= 14 hours
Comp time >= 6 hours
Yes
Yes
Ye
Total door open time >= 3min?
CONTROL OBJECT
Defrost Mode
Start
Yes
No
No
Yes
Comp Rate >= 80%
No
Any Error?
No
RT Temp >= 40C
No
No
END
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FUNCTIONS
No
No