Daewoo FR-660N/NT Service Manual page 27

Control
NO.
Function
8 Determination
of
defrost
9 Defrost
function
Control
Objects
1. Defrost function is started by the following 4 conditions.
Condition 1 : Accumulated COMP. on time (MAX. and MIN.
Condition 2 : Accumulated door open time (different from the
Condition 3 : COMP. operation ratio (calculated by the time
Condition 4 : The door open data every 2 hours interval same
2. Method of determination defrost
A
End of
defrosting
¢... Order of judgement
C
1) In
operation ratio from
2) In D
operation ratio from
E
3) In
COMP. 1. Defrost step
F-fan
C-fan
R-fan
COMP.
Heater
F-fan
R-fan
D-heater
Contents
time)
accumulated door open time in fuzzy function)
divided by 150 min. after defrost)
as fuzzy function
B C
For MIN. time
150 min. (5 hours)
, it goes directly to defrost mode if the COMP.
B C
to is over 80%.
, it goes directly to defrost mode if the COMP.
B to D is over 80%.
, it enters to defrost mode unconditionally.
R-fan D-heater
Pre-cool
defrost defrost
on off
on off
on on
off off
Time : 30 min. Time : 10 min. Time : 90 min.
Regardless of If D-sensor
door open temperature
is over 10˚C,
If D-sensor
D-heater goes
temperature
off.
is over 10˚C,
R-fan goes off If D-sensor is
and it skips to in error, it is
pause step. on for 45 min.
unconditionally
Quick mode Defrost is prior Defrost is prior
is prior
25
D E
Accumulated door MAX. time
open time (10 min.) (8 hours)
Pause Fan delay
off off on
off off off
off off off
on off off
Time : 7 min. Time : 5 min.
Defrost is prior Defrost is prior
Remark