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Fedders R407C service manual VI. Temperature Control and Measurement, VII. Auto Fan Function

Models: R407C

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VI. Temperature Control and Measurement

1.Temperature Measurement Accuracy

The temperature measurement range of the air-con controller is from -10ºC to 60ºC. Measurement accuracy is given in the following Table:

ºC

+

-

 

ºC

+

-

 

ºC

+

-

 

ºC

+

-

 

ºC

+

-

-10

1

1

 

5

1

1

 

20

1

1

 

35

1

1

 

50

1

1

-9

1

1

 

6

1

1

 

21

1

1

 

36

1

1

 

51

1

1

-8

1

1

 

7

1

1

 

22

1

1

 

37

1

1

 

52

1

1

-7

1

1

 

8

1

1

 

23

1

1

 

38

1

1

 

53

1

1

-6

1

1

 

9

1

1

 

24

1

1

 

39

1

1

 

54

1

1

-5

1

1

 

10

1

1

 

25

1

1

 

40

1

1

 

55

1

1

-4

1

1

 

11

1

1

 

26

1

1

 

41

1

1

 

56

1

1

-3

1

1

 

12

1

1

 

27

1

1

 

42

1

1

 

57

1

1

-2

1

1

 

13

1

1

 

28

1

1

 

43

1

1

 

58

1

1

-1

1

1

 

14

1

1

 

29

1

1

 

44

1

1

 

59

1

1

0

1

1

 

15

1

1

 

30

1

1

 

45

1

1

 

60

1

1

1

1

1

 

16

1

1

 

31

1

1

 

46

1

1

 

 

 

 

2

1

1

 

17

1

1

 

32

1

1

 

47

1

1

 

 

 

 

3

1

1

 

18

1

1

 

33

1

1

 

48

1

1

 

 

 

 

4

1

1

 

19

1

1

 

34

1

1

 

49

1

1

 

 

 

 

Temperature measurement error

2.Room Temperature Control Range

The room temperature control range of the air-con controller is from 16ºC to 31ºC, both inclusive. In manual operation, set temperature is adjusted using the temperature setting

buttons "∧" and "∨" on the hand-held transmitter.

At each press of one of the buttons, the set temperature is changed by 1ºC if it is currently in cool or heat mode until the upper limit of 31°C or the lower limit of 16°C is reached. In Auto mode, pressing the temperature setting buttons will cause the set temperature to change in steps of 2°C until the upper limit of 24°C or the lower limit of 20°C is hit, but the temperature setting will not be displayed on the hand-held transmitter.

VII. Auto Fan Function

Auto fan function is not available in dry and fan modes.

This function will be disabled if the sleep function is later selected. On the other hand, if sleep function is activated first, it is not possible to select the Auto fan function.

In automatic operation, the Auto fan function will be chosen if the air-con operates in cool or heat mode.

F9

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Fedders R407C service manual VI. Temperature Control and Measurement, VII. Auto Fan Function
Page 55 Page 57

R407C specifications

Fedders R407C is a commonly used refrigerant that has made significant strides in the air conditioning and refrigeration industries. Developed as a replacement for R22, R407C blends three refrigerants: R32, R125, and R134a. This combination gives it versatile applications and makes it a popular choice in residential and commercial systems.

One of the main features of R407C is its zero ozone depletion potential (ODP). This is crucial in an era where environmental regulations are stricter and focus on reducing substances that could harm the ozone layer. R407C also boasts a relatively low global warming potential (GWP) compared to other refrigerants, which aligns with the growing demand for low-impact environmentally friendly solutions.

Technologically, R407C is compatible with many existing systems, particularly those designed for R22, making it a favored transitional refrigerant during the phase-out of ozone-depleting substances. However, it is vital to note that R407C operates at a higher pressure than R22, meaning that certain system components may need upgrading to ensure optimal performance and safety.

In terms of thermodynamic characteristics, R407C has a refrigerating effect similar to R22, making it efficient for cooling purposes across various applications. It has good heat transfer properties, which translates to efficient energy use in both residential and commercial installations. The refrigerant operates effectively across a broad temperature range, making it an ideal choice for air conditioners, heat pumps, and chillers.

Moreover, R407C is a near-azeotropic blend, which implies that it maintains its composition during evaporation and condensation. This characteristic helps in minimizing the risks of refrigerant fractionation, allowing for consistent performance over time.

Another noteworthy aspect of Fedders R407C is its favorable safety profile. It has a lower toxicity level compared to some other refrigerants, which enhances its suitability for varied applications. Additionally, it is non-flammable under normal conditions, making it a safe option for different installations.

In conclusion, Fedders R407C is characterized by its environmental safety, excellent thermodynamic qualities, and compatibility with existing refrigeration systems. As industries strive to meet new environmental regulations, R407C serves as a reliable option, providing performance without compromising on ecological concerns. Its pivotal role in transitioning to greener alternatives makes it a critical refrigerant in today’s climate-conscious market.