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The characteristic that resistance value reduces as the temperature increases is deemed to have negative
slope or negative temperature coefficient (NTC), and such thermistor is called as NTC thermistor. The
resistance value changes sensitively with temperature and typically changes 7% ~ 3% per degree
centigrade. Sensor used in the refrigerator is NTC thermistor.
There is following computing formula for the sensor:Sampling voltage / reference voltage =
R1 / (RNTC + R1)
AD value / reference AD value = R1 / (RNTC + R1)
The reference voltage is 5V, RNTC is the resistance value of the sensor, R1 is R31\R32\R33 in schematic
diagram that is 5.1K
10.4Fan motor circuit of the freezing chamber(None)
10.5Refrigerator fan motor circuit (None)
10.6Condensing fan motor circuit (None)
10.7Damper motor circuit (None)
10.8（R/T）Resistance value of the sensor (R/T)
Tx(℃)
R（KΩ）
Tx(℃)
-30
33.81
-15
31.85
-29
-14
-28
30.01
-13
-27
28.29
-12
26.68
-26
-11
-25
25.17
-10
-24
23.76
-9
-23
22.43
-8
21.18
-22
-7
-21
20.01
-6
-20
18.9
-5
R（KΩ）
Tx(℃)
R（KΩ）
14.31
0
6.495
13.55
6.175
1
12.83
2
5.873
12.16
3
5.587
11.52
5.315
4
10.92
5
5.06
10.35
6
4.818
9.82
7
4.589
9.316
4.372
8
8.841
9
4.167
8.392
10
3.972
Service Manual, 2016-12
Tx(℃)
R（KΩ）
Tx(℃)
15
3.141
30
2.999
16
31
17
2.865
32
18
2.737
33
2.616
19
34
20
2.501
35
21
2.391
36
22
2.287
37
2.188
23
38
24
2.094
39
25
2.005
40
R（KΩ）
1.617
1.55
1.486
1.426
1.368
1.312
1.259
1.209
1.161
1.115
1.071
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