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