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24
Room temperature and Evaporator temperature Sensor Input
DESCRIPTION
Number 23 of Micom is Terminal of A/D convertor Input.
Room temperature and Evaporator temperature is sensing by change of Thermister Resistance, Micom is put
in 5V by ratio between R37 (12.7KΩ) and R38 (12.7KΩ).
Relation between temperature and voltage is following Table 3-1.
CA1 is Noise filter.
Sensor(3)
EVA
PT-K43C
Room
PT-K43C
SMW250-04
CN10
5V
1
2
3
4
R37
12.7K
330
CA1
104
R31
330
R32
R38
12.7K
CA1
104
5 23 MICOM
1
MUX
Resistance & Voltage of the Sensor
temp(°C)
–10
–9
–8
–7
–6
–5
–4
–3
–2
–1
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
resistance1(Ω)
54,769
52,070
49,579
47,272
44,116
42,190
40,390
37,902
36,368
34,235
32,279
31,064
29,358
27,781
26,794
25,400
24,101
22,888
21,752
20,687
19,685
19,050
18,143
17,286
16,476
15,708
14,979
Vout(V)
0.941
0.980
1.020
1.059
1.118
1.157
1.196
1.255
1.294
1.353
1.412
1.451
1.510
1.569
1.608
1.667
1.725
1.784
1.843
1.902
1.961
2.000
2.059
2.118
2.176
2.235
2.294
temp(°C)
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
resistance1(Ω)
14,288
13,629
13,002
12,405
12,021
11,468
10,939
10,432
9,947
9,634
9,182
8,890
8,467
8,060
7,79,
7,415
7,168
6,809
6,577
6,239
6,020
5,806
5,597
5,392
5,094
4,901
4,711
Vout(V)
2.353
2.412
2.471
2.529
2.569
2.627
2.686
2.745
2.804
2.843
2.902
2.941
3.000
3.059
3.095
3.157
3.196
3.255
3.294
3.353
3.392
3.431
3.471
3.510
3.569
3.608
3.647
temp(°C)
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
resistance1(Ω)
4,526
4,435
4,255
4,080
3,908
3,739
3,656
3,493
3,332
3,253
3,098
3,021
2,870
2,795
2,721
2,576
2,504
2,433
2,363
2,293
2,156
2,088
2,020
1,954
1,888
1,822
1,758
Vout(V)
3.686
3.706
3.745
3.784
3.824
3.863
3.882
3.922
3.961
3.980
4.020
4.039
4.078
4.098
4.118
4.157
4.176
4.196
4.216
4.235
4.275
4.294
4.314
4.333
4.353
4.373
4.392