Maintenance

To Test Humidity Sensors

 

 

Return Air Humidity Sensor

ECA

RAH/RAE

Outdoor Humidity Sensor

ECA

OAH/OAE

To test this circuit, place a DC milliamp meter in series with either of the leads to the humidity sensor. If the reading is 0ma, polarity may be reversed. Reverse + & - and retest. If the reading does not correspond to the table below, check the output voltage from the ECA with the sensor disconnected. It should be approximately 20VDC. If so, and all connections are intact, replace the sensor. If 20VDC is not present, yet the ECA green LED is on, the ECA module has failed.Humidity sensor accuracy : +/-10% RH.

Table 56 - Humidity sensor test

RH%

DCma

RH%D

Cma

RH%

DCma

100%

20.000

52.6

12.414

31.2

9.000

 

 

 

 

 

 

97.7

19.636

51.7

12.273

30.8

8.926

 

 

 

 

 

 

95.5

19.286

50.8

12.135

30.3

8.852

 

 

 

 

 

 

93.4

18.947

50.0

12.000

29.9

8.780

 

 

 

 

 

 

91.4

18.621

49.2

11.868

29.4

8.710

 

 

 

 

 

 

89.4

18.305

48.4

11.739

29.0

8.640

 

 

 

 

 

 

87.5

18.000

47.6

11.613

28.6

8.571

 

 

 

 

 

 

85.7

17.705

46.8

11.489

28.1

8.504

 

 

 

 

 

 

83.9

17.419

46.1

11.368

27.7

8.438

 

 

 

 

 

 

82.1

17.143

45.3

11.250

27.3

8.372

 

 

 

 

 

 

80.5

16.875

44.6

11.134

26.9

8.308

 

 

 

 

 

 

78.8

16.615

43.9

11.020

26.5

8.244

 

 

 

 

 

 

77.3

16.364

43.2

10.909

26.1

8.182

 

 

 

 

 

 

75.7

16.119

42.5

10.800

25.8

8.120

 

 

 

 

 

 

74.3

15.882

41.8

10.693

25.4

8.060

 

 

 

 

 

 

72.8

15.652

41.2

10.588

25.0

8.000

 

 

 

 

 

 

71.4

15.429

40.5

10.485

24.6

7.941

 

 

 

 

 

 

70.1

15.211

39.9

10.385

24.3

7.833

 

 

 

 

 

 

68.8

15.000

39.3

10.286

23.9

7.826

 

 

 

 

 

 

67.5

14.795

38.7

10.189

23.6

7.770

 

 

 

 

 

 

66.2

14.595

38.1

10.093

23.2

7.714

 

 

 

 

 

 

65.0

14.400

37.5

10.000

22.9

7.660

 

 

 

 

 

 

63.8

14.211

36.9

9.908

22.5

7.606

 

 

 

 

 

 

62.7

14.026

36.4

9.818

22.2

7.552

 

 

 

 

 

 

61.5

13.846

35.8

9.730

21.9

7.500

 

 

 

 

 

 

60.4

13.671

35.3

9.463

21.6

7.448

 

 

 

 

 

 

59.4

13.500

34.7

9.558

21.2

7.397

 

 

 

 

 

 

58.3

13.333

34.2

9.474

20.9

7.347

 

 

 

 

 

 

57.3

13.171

33.7

9.391

20.6

7.297

 

 

 

 

 

 

56.3

13.012

33.2

9.310

20.3

7.248

 

 

 

 

 

 

55.4

12.857

32.7

9.231

20.0

7.200

 

 

 

 

 

 

54.4

12.706

32.2

9.153

 

 

 

 

 

 

 

 

53.5

12.558

31.7

9.076

 

 

 

 

 

 

 

 

66

RT-SVX20A-E4

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Trane TSH 060 To Test Humidity Sensors Return Air Humidity Sensor, Outdoor Humidity Sensor, Humidity sensor test, DCma

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