DONGBU DAEWOO ELECTRONICS FN-T650NTB SERIES, Service Manual

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7-3. Defrost Mode
INPUT CONTROL OBJECT
●
Total COMP Work Time
●
COMP Working Rate
●
Total Door Open Time
●
RT
●
Defrost Mode
A. When total operation time of compressor becomes: 6, 8, 10, 12 hours.
ⓐ
any error mode-R1, D1, F3, C1, RT/S, Door SW error- happens.
ⓑ
or, running rate of COMP (per 2hrs of total operation time) is more than 90%.
ⓒ
or, total door open time is over 2 minutes.
B. Even if the above condition “ A ” is not satisfied,
ⓐ
Defrost mode starts immediately when total operation time of COMP is 14hrs.
ⓒ
or, defrost mode starts immediately as long as total time (COMP on time + COMP off time) is 24 hrs
at Low RT A,B period
ⓑ
or, defrost mode starts immediately as long as total time (COMP on time + COMP off time) is 60 hrs.
A. General Defrost Mode
ⓐ
How to start: By conditions of defrost
ⓑ
Process :
General operation →
“PRE-COOL” → Defrost Heater on → Pause(10 min ) → General operation
※
PRE-COOL: When the defrost heater works, the temp. of freezer increases.
So the COMP works for 25 min before defrost mode.
ⓒ
Limited Time of Defrost Heater
●
40 minutes: Heater turns off when “D SENSOR” is OPEN or SHORT.
●
50 minutes: Heater turns off after 50 minutes.
ⓓ
Heater Off: When the temperature at “D SENSOR” is over 10
°
C
B. Forced Defrost Mode
ⓐ
How to start: by press “temp” button for continuously and “s-cool” button 5 times.
ⓑ
Process: same as General Defrost Mode except “PRE-COOL”
※
Heater is on Initial 30 seconds even though the temp. at “D SENSOR” is over 10
°
C.
(for TEST)
ⓒ
How to confirm: by press “temp” button for continuously and “lock” button 5 times
.
And then, the mode displays.
ⓓ
Display : “d2” is displayed.
●
Conditions of Defrost Mode
●
Defrost Mode
PRE-COOL Defrost Mode Pause
Compressor ON OFF OFF
Fan ON OFF OFF
Defrost Heater OFF ON OFF
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