Table 3-2-6 Flare and flare nut dimensions for R22

Nominal

Outer

Thickness

 

Dimension (mm)

 

Flare nut

diameter

 

 

 

 

width

diameter

(mm)

 

 

 

 

(mm)

A

B

C

D

(mm)

 

 

 

 

 

 

 

 

 

 

1/4

6.35

0.8

9.0

9.2

6.5

13

17

 

 

 

 

 

 

 

 

3/8

9.52

0.8

13.0

13.5

9.7

20

22

 

 

 

 

 

 

 

 

1/2

12.70

0.8

16.2

16.0

12.9

20

24

 

 

 

 

 

 

 

 

5/8

15.88

1.0

19.7

19.0

16.0

23

27

 

 

 

 

 

 

 

 

3/4

19.05

1.0

23.3

24.0

19.2

34

36

 

 

 

 

 

 

 

 

to

46˚

45˚

 

 

 

 

 

B AC D

43˚

to

 

45˚

Fig. 3-2-2 Relations between flare nut and flare seal surface

(2)Flare Connecting Procedures and Precautions

a)Make sure that the flare and union portions do not have any scar or dust, etc.

b)Correctly align the processed flare surface with the union axis.

c)Tighten the flare with designated torque by means of a torque wrench. The tightening torque for R410A is the same as that for conventional R22. Incidentally, when the torque is weak, the gas leakage may occur.

When it is strong, the flare nut may crack and may be made non-removable. When choosing the tightening torque, comply with values designated by manufacturers. Table 3-2-7 shows reference values.

NOTE :

When applying oil to the flare surface, be sure to use oil designated by the manufacturer. If any other oil is used, the lubricating oils may deteriorate and cause the compressor to burn out.

Table 3-2-7 Tightening torque of flare for R410A [Reference values]

Nominal

Outer

Tightening torque

Tightening torque of torque

diameter

wrenches available on the market

diameter

N•m (kgf•cm)

(mm)

N•m (kgf•cm)

 

 

 

 

 

 

1/4

6.35

14 to 18 (140 to 180)

16 (160), 18 (180)

 

 

 

 

3/8

9.52

33 to 42 (330 to 420)

42 (420)

 

 

 

 

1/2

12.70

50 to 62 (500 to 620)

55 (550)

 

 

 

 

5/8

15.88

63 to 77 (630 to 770)

65 (650)

 

 

 

 

– 15 –

Page 14 Page 16
Page 15
Image 15
Toshiba RAS-B13EKVP-E, RAS-M13EKCVP-E, RAS-M18EACV-E, RAS-M14EACV-E Nm kgfcm, Diameter Wrenches available on the market
Page 14 Page 16

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