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Friedrich Thermistor Resistance Values for HVAC Systems

Models: R-410A

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THERMISTORS’ RESISTANCE VALUES

(This Table Applies to All Thermistors)

TEMP

 

INDOOR AIR SENSOR

 

RESISTANCE

 

 

RESISTENCE (K Ohms)

TOLERANCE %

F

MIN

 

CENTR

 

MAX

MIN

MAX

-25

210.889

 

225.548

 

240.224

6.50

6.51

 

 

 

 

 

 

 

 

-20

178.952

 

190.889

 

202.825

6.25

6.25

 

 

 

 

 

 

 

 

-15

151.591

 

161.325

 

171.059

6.03

6.03

 

 

 

 

 

 

 

 

-10

128.434

 

136.363

 

144.292

5.81

5.81

 

 

 

 

 

 

 

 

-5

108.886

 

115.340

 

121.794

5.60

5.60

0

92.411

 

97.662

 

102.912

5.38

5.38

5

78.541

 

82.812

 

87.083

5.16

5.16

10

66.866

 

70.339

 

73.812

4.94

4.94

15

57.039

 

59.864

 

62.688

4.72

4.72

20

48.763

 

51.060

 

53.357

4.50

4.50

 

 

 

 

 

 

 

 

25

41.786

 

43.654

 

45.523

4.28

4.28

 

 

 

 

 

 

 

 

30

35.896

 

37.415

 

38.934

4.06

4.06

 

 

 

 

 

 

 

 

31

34.832

 

36.290

 

37.747

4.02

4.02

 

 

 

 

 

 

 

 

32

33.803

 

35.202

 

36.601

3.97

3.97

 

 

 

 

 

 

 

 

33

32.808

 

34.150

 

35.492

3.93

3.93

34

31.846

 

33.133

 

34.421

3.89

3.89

35

30.916

 

32.151

 

33.386

3.84

3.84

36

30.016

 

31.200

 

32.385

3.80

3.80

37

29.144

 

30.281

 

31.418

3.75

3.75

38

28.319

 

29.425

 

30.534

3.76

3.77

39

27.486

 

28.532

 

29.579

3.67

3.67

 

 

 

 

 

 

 

 

40

26.697

 

27.701

 

28.704

3.62

3.62

 

 

 

 

 

 

 

 

45

23.116

 

23.931

 

24.745

3.40

3.40

 

 

 

 

 

 

 

 

50

20.071

 

20.731

 

21.391

3.18

3.18

 

 

 

 

 

 

 

 

55

17.474

 

18.008

 

18.542

2.96

2.96

60

15.253

 

15.684

 

16.115

2.75

2.75

65

13.351

 

13.697

 

14.043

2.53

2.53

66

13.004

 

13.335

 

13.666

2.48

2.48

67

12.668

 

12.984

 

13.301

2.44

2.44

68

12.341

 

12.644

 

12.947

2.39

2.39

 

 

 

 

 

 

 

 

69

12.024

 

12.313

 

12.603

2.35

2.35

 

 

 

 

 

 

 

 

70

11.716

 

11.993

 

12.269

2.31

2.31

 

 

 

 

 

 

 

 

71

11.418

 

11.682

 

11.946

2.26

2.26

 

 

 

 

 

 

 

 

72

11.128

 

11.380

 

11.633

2.22

2.22

 

 

 

 

 

 

 

 

73

10.846

 

11.088

 

11.329

2.18

2.18

74

10.574

 

10.804

 

11.034

2.13

2.13

75

10.308

 

10.528

 

10.748

2.09

2.09

76

10.051

 

10.260

 

10.469

2.04

2.04

77

9.800

 

10.000

 

10.200

2.00

2.00

 

 

 

 

 

 

 

 

78

9.550

 

9.748

 

9.945

2.03

2.03

 

 

 

 

 

 

 

 

79

9.306

 

9.503

 

9.699

2.07

2.07

80

9.070

 

9.265

 

9.459

2.10

2.10

81

8.841

 

9.033

 

9.226

2.13

2.13

82

8.618

 

8.809

 

9.000

2.17

2.17

83

8.402

 

8.591

 

8.780

2.20

2.20

84

8.192

 

8.379

 

8.566

2.23

2.23

85

7.987

 

8.172

 

8.358

2.27

2.27

 

 

 

 

 

 

 

 

86

7.789

 

7.972

 

8.155

2.30

2.30

 

 

 

 

 

 

 

 

87

7.596

 

7.778

 

7.959

2.33

2.33

 

 

 

 

 

 

 

 

88

7.409

 

7.589

 

7.768

2.37

2.37

 

 

 

 

 

 

 

 

89

7.227

 

7.405

 

7.583

2.40

2.40

90

7.050

 

7.226

 

7.402

2.43

2.43

91

6.878

 

7.052

 

7.226

2.47

2.47

92

6.711

 

6.883

 

7.055

2.50

2.50

93

6.548

6.718

 

6.889

2.53

2.53

94

6.390

6.558

 

6.727

2.57

2.57

95

6.237

6.403

 

6.569

2.60

2.60

 

 

 

 

 

 

 

96

6.087

6.252

 

6.417

2.63

2.63

97

5.942

6.105

 

6.268

2.67

2.67

98

5.800

5.961

 

6.122

2.70

2.70

 

 

 

 

 

 

 

99

5.663

5.822

 

5.981

2.73

2.73

100

5.529

5.686

 

5.844

2.77

2.77

105

4.912

5.060

 

5.208

2.93

2.93

110

4.371

4.511

 

4.651

3.10

3.10

115

3.898

4.030

 

4.161

3.27

3.27

120

3.482

3.606

 

3.730

3.43

3.43

76

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Friedrich R-410A service manual THERMISTORS’ Resistance Values, This Table Applies to All Thermistors
Page 76 Page 78

R-410A specifications

Friedrich R-410A is an advanced refrigerant widely used in HVAC (Heating, Ventilation, and Air Conditioning) systems, known for its high efficiency and environmental friendliness. As a hydrofluorocarbon (HFC) blend, R-410A has become the preferred alternative to R-22, which is being phased out due to its ozone-depleting potential. One of the main features of R-410A is its high latent heat of vaporization, which allows for efficient heat transfer and improved cooling performance in air conditioning units.

Technologically, R-410A operates at higher pressures than older refrigerants, meaning systems designed for R-410A need to be built with more robust components to safely handle these pressures. This results in a more compact system design that offers enhanced performance and reliability. The dual-component nature of R-410A—composed of difluoromethane (R-32) and pentafluoroethane (R-125)—provides an optimal balance of thermodynamic properties, leading to superior energy efficiency, especially in variable speed applications.

In terms of characteristics, R-410A has a higher cooling capacity, which enables HVAC systems to effectively cool larger spaces or run more efficiently when cooling smaller areas. The refrigerant is non-toxic and non-flammable, which enhances safety during its use. In addition, R-410A has a lower global warming potential relative to other refrigerants, making it a more environmentally responsible choice for modern cooling systems.

Moreover, R-410A systems typically require less refrigerant charge due to their efficiency, contributing to reduced greenhouse gas emissions. The adoption of R-410A aligns with regulatory trends aimed at minimizing the environmental impact of refrigerants in cooling applications.

Overall, the Friedrich R-410A refrigerant embodies a combination of technology and environmental stewardship, making it a cornerstone of contemporary HVAC design. Its ability to provide effective and energy-efficient cooling solutions while being compliant with modern environmental regulations positions R-410A as the refrigerant of choice for engineers and installers focused on sustainability and performance in air conditioning systems.