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Nominal
Outer diameter
diameter
1/4
3/8
1/2
5/8
3/4
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
diameter
1/4
3/8
1/2
5/8
Table 3-2-6 Flare and flare nut dimensions for R22
Thickness
(mm)
6.35
9.52
12.70
15.88
19.05
B
Fig. 3-2-2 Relations between flare nut and flare seal surface
Outer
Tightening torque
diameter
N•m (kgf•cm)
(mm)
6.35
14 to 18 (140 to 180)
9.52
33 to 42 (330 to 420)
12.70
50 to 62 (500 to 620)
15.88
63 to 77 (630 to 770)
Dimension (mm)
(mm)
A
B
0.8
9.0
9.2
0.8
13.0
13.5
0.8
16.0
16.2
1.0
19.0
19.7
1.0
23.3
24.0
A
torque wrenches available on the market
–
–
10
FILE NO. SVM-12071
Flare nut width
(mm)
C
D
6.5
13
17
9.7
20
22
12.9
20
24
16.0
23
27
19.2
34
36
C
D
Tightening torque of
N•m (kgf•cm)
16 (160), 18 (180)
42 (420)
55 (550)
65 (650)
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