Sharp AH-X08CR Service Manual page 41

AH/AY-X08CR
AH/AY-X10CR
AH/AY-X13CR
Norminal
diameter
1/4
3/8
1/2
5/8
(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 same as that for conventional R22. Incidentally, when the torque is wekd, the gas leakage
may occur. When it is strong, the flare nut may crack and may be made nonremovable. When
choosing the tightening torque, comply with values designated by manufacturers. Table 9 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.
Norminal
diameter
1/4
3/8
1/2
5/8
Table 7. Flare and Flare Nut Dimensions for R22
Norminal Thickness
diameter (mm)
(mm)
6.35 0.8
0.8
9.52
0.8
12.70
15.88 1.0
B A
Fig. 4 Relations between Flare Nut and Flare Seal Surface
Table 8. Tightening Torque of R410A [Reference Values]
Norminal Tightening torque
diameter N m (kgf cm)
(mm)
6.35 14 ~ 18 (140 ~ 180)
33 ~ 42 (330 ~ 420)
9.52
50 ~ 62 (500 ~ 620)
12.70
15.88 63 ~ 77 (630 ~ 770)
Dimension (mm)
A B C
9.0 9.2 6.5
13.0 13.5 9.7
16.2 16.0 12.9
19.4 19.0 16.0
Tightening torque of torque
wrenches available on the market
N m (kgf cm)
16 (160), 18 (180)
52
[Unit: mm]
Flare nut
width
D
13 17
20 22
20 24
23 27
C D
42 (420)
55 (550)
65 (650)