CHECKING TEMPERATURE SENSOR OUTSIDE UNIT CIRCUIT

1.Disconnect temperature sensor from board and from outdoor coil.

2.Use an ohmmeter and measure the resistance of the sensor. Also use ohmmeter to check for short or open.

3.Check resistance reading to chart of resistance use sensor ambient temperature. (Tolerance of part is

± 10%)

4.If sensor resistance reads very low, then sensor is shorted and will not allow proper operation of the heat pump control.

5.If sensor is out of tolerance, shorted, open, or reads very low ohms then it should be replaced.

TEMPERATURE F VS RESISTANCE R OF TEMPERATURE

 

F

R

F

R

F

R

 

 

 

 

 

 

 

 

 

 

 

 

-25.0

196871

25.0

39898

75.0

10501

 

 

 

-24.0

190099

26.0

38757

76.0

10247

 

 

 

-23.0

183585

27.0

37652

77.0

10000

 

 

 

-22.0

177318

28.0

36583

78.0

9760

 

 

 

-21.0

171289

29.0

35548

79.0

9526

 

 

 

-20.0

165487

30.0

34545

80.0

9299

 

 

 

-19.0

159904

31.0

33574

81.0

9077

 

 

 

-18.0

154529

32.0

32634

82.0

8862

 

 

 

-17.0

149355

33.0

31723

83.0

8653

 

 

 

-16.0

144374

34.0

30840

84.0

8449

 

 

 

-15.0

139576

35.0

29986

85.0

8250

 

 

 

-14.0

134956

36.0

29157

86.0

8057

 

 

 

-13.0

130506

37.0

28355

87.0

7869

 

 

 

-12.0

126219

38.0

27577

88.0

7686

 

 

 

-11.0

122089

39.0

26823

89.0

7507

 

 

 

-10.0

118108

40.0

26092

90.0

7334

 

 

 

-9.0

114272

41.0

25383

91.0

7165

 

 

 

-8.0

110575

42.0

24696

92.0

7000

 

 

 

-7.0

107010

43.0

24030

93.0

6840

 

 

 

-6.0

103574

44.0

23384

94.0

6683

 

 

 

-5.0

100260

45.0

22758

95.0

6531

 

 

 

-4.0

97064

46.0

22150

96.0

6383

 

 

 

-3.0

93981

47.0

21561

97.0

6239

 

 

 

-2.0

91008

48.0

20989

98.0

6098

 

 

 

-1.0

88139

49.0

20435

99.0

5961

 

 

 

0.0

85371

50.0

19896

100.0

5827

 

 

 

1.0

82699

51.0

19374

101.0

5697

 

 

 

2.0

80121

52.0

18867

102.0

5570

 

 

 

3.0

77632

53.0

18375

103.0

5446

 

 

 

4.0

75230

54.0

17898

104.0

5326

 

 

 

5.0

72910

55.0

17434

105.0

5208

 

 

 

6.0

70670

56.0

16984

106.0

5094

 

 

 

7.0

68507

57.0

16547

107.0

4982

 

 

 

8.0

66418

58.0

16122

108.0

4873

 

 

 

9.0

64399

59.0

15710

109.0

4767

 

 

 

10.0

62449

60.0

15310

110.0

4663

 

 

 

11.0

60565

61.0

14921

111.0

4562

 

 

 

12.0

58745

62.0

14544

112.0

4464

 

 

 

13.0

56985

63.0

14177

113.0

4367

 

 

 

14.0

55284

64.0

13820

114.0

4274

 

 

 

15.0

53640

65.0

13474

115.0

4182

 

 

 

16.0

52051

66.0

13137

116.0

4093

 

 

 

17.0

50514

67.0

12810

117.0

4006

 

 

 

18.0

49028

68.0

12492

118.0

3921

 

 

 

19.0

47590

69.0

12183

119.0

3838

 

 

 

20.0

46200

70.0

11883

120.0

3757

 

 

 

21.0

44855

71.0

11591

121.0

3678

 

 

 

22.0

43554

72.0

11307

122.0

3601

 

 

 

23.0

42295

73.0

11031

123.0

3526

 

 

 

24.0

41077

74.0

10762

124.0

3452

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Manual

2100-455A

 

 

 

 

 

 

Page

21 of 25

Page 21
Image 21
Bard CH4S1, CH5S1, CH3S1 Checking Temperature Sensor Outside Unit Circuit, Temperature F VS Resistance R of Temperature

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