Haier HSM518HMNSS0 - Chapter 6 Main Function Operating Principles; Defrost System Control Logic

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Model: HSM518HMNSS0
SERVICE MANUAL
Issue
20200930
REF.
Ref1505S017V0
Chapter 6 Main Function Operating principle
6-1 Defrost system
6-1-1 defrost control ：
According to the times of opening and closing the door and the time of the compressor cumulative
working, the refrigerator has different frost timing . When the temperature of the defrost sensor reaches
7℃,the defrost stops, in defrosting the compressor and freezer fan are off, the refrigeration damper
closes.
If the defrost time reaches 70 minutes, but the temperature of the defrost sensor does not reach 7℃,
then the defrost heater is off, Ed displays.
6-1-2. the easily broken part in the defrost system ：
1） Defrost fuse, it is on the middle of the evaporator, outer is plastic bushing, normally, it is conducting.
If it is open, it is broken.
2） The connection between the defrost fuse or defrost heater and cabinet, if the connection terminal
falls off or decline, poor contact will happen.
3） Defrost sensor, which locates at the top right
6-1-3. defrost rule
RT（℃）
Time
Defrost condition
RT＜23
Compressor accumulative
running time：7H＜T≤12H
R.door open accumulative time ≥9min ，Defrost Immediately
Compressor accumulative
running time：T＞12H
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R.door open accumulative time ≥3min ，Defrost Immediately；
Refrigerator accumulative
running time =50H
Defrost Immediately
23≤RT≤28
Compressor accumulative
running time：7H＜T≤12H
R.door open accumulative time ≥9min ，Defrost Immediately
Compressor accumulative
running time：T＞12H
R.door open accumulative time ≥3min ，Defrost Immediately；
Refrigerator accumulative
running time =72H
Defrost Immediately
28＜RT＜
35
Compressor accumulative
running time：7H＜T≤12H
R.door open accumulative time ≥9min ，Defrost Immediately