Daewoo FRS-U20DD. Service Manual page 9

4-2. Defrost Mode ( None Inverter Compressor Models )
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 compressor becomes : 6, 8, 10, ......... , 24 hours.
a. Compressor operating rate (If RT-sensor temperature is below 35 C) : more 85% by 2 hours.
b. Total door open time : 2 minutes
(Any door, F or R open time is over 2 minutes.)
c. 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 case of initially power connected (or power reset)
If D-sensor temperature below 3.5 degree, defrosting mode starts .
INPUT
CONTENTS
Pre-Cool
; Compressor runs (to sub-cool the freezer compartment prior to
the defrost heater switch on) for 50 minutes or until F-sensor tem-
perature reaches -27C whichever comes first.
(Refrigerator compartment is controlled normal condition)
Heater
Defrosting
1) Defrost heater is switch on until D-sensor temperature
reaches 13C.
(Compressor, F-Fan, R-Fan is off)
2) Defrost heater on time.
- 30 seconds : Heater is ON regardless of D-sensor
temperature the moment when heater is on.
- 30 minutes : In case of "D1" error (D-sensor malfunction)
- 80 minutes : in normal control state, the maximum on time.
Pause
After the defrost heater is switched off, Compressor does not run
within 7 minutes.
( F-fan, R-fan, Heater etc. : OFF)
Fan-Delay
After defrost, when the first compressor turn on, F-Fan start to run
after 5 minutes from compressor turn on.
9
CONTROL OBJECT
1. Comp
2. F-Fan
3. R-Fan
4. D-Heater
REMARKS