Temperature Test Circuit(None); Freezer Chamber Fan Motor Circuit (None); Refrigerating Chamber Fan Motor Circuit (None); Condensation Fan Circuit (None) - Midea COMPACT Series Service Manual

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

10.3 Temperature test circuit(None)

10.4 Freezer chamber fan motor circuit (None)

10.5 refrigerating chamber fan motor circuit (None)

10.6 Condensation fan circuit (None)

10.7 Fan motor circuit of the ventilation door(None)

10.8 Resistance value of the sensor (R/T) (None)

Tx(℃) R（KΩ）
-30 33.81
31.85
-29
-28 30.01
-27 28.29
-26 26.68
-25 25.17
-24 23.76
-23 22.43
-22 21.18
Tx(℃) R（KΩ） Tx(℃)
-15 14.31
13.55
-14
-13 12.83
-12 12.16
-11 11.52
-10 10.92
-9 10.35
-8 9.82
-7 9.316
R（KΩ） Tx(℃)
0 6.495 15
6.175
1 16
2 5.873 17
3 5.587 18
4 5.315 19
5 5.06 20
6 4.818 21
7 4.589 22
8 4.372 23
30
Service Manual_2018-V1.0
R（KΩ） Tx(℃)
3.141 30
2.999
31
2.865 32
2.737 33
2.616 34
2.501 35
2.391 36
2.287 37
2.188 38
R（KΩ）
1.617
1.55
1.486
1.426
1.368
1.312
1.259
1.209
1.161