Toshiba RAS-M10PKVP-E Service Manual page 12

Nominal Outer diameter
diameter (mm)
1/4 6.35
3/8 9.52
1/2 12.70
5/8 15.88
3/4 19.05
2. Flare Connecting Procedures and Precautions
a) Make sure that the fl are and union portions do not have any scar or dust, etc.
b) Correctly align the processed fl are surface with the union axis.
c) Tighten the fl are 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 fl are 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 fl are 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 fl are for R410A [Reference values]
Nominal diameter
1/4
3/8
1/2
5/8
Table 3-2-6 Flare and fl are nut dimensions for R22
Thickness
(mm)
0.8
0.8
0.8
1.0
1.0
B A
Fig. 3-2-2 Relations between flare nut and flare seal surface
Outer diameter (mm)
6.35
9.52
12.70
15.88
Dimension (mm)
A B C
9.1 9.2 6.5
13.0 13.5 9.7
16.2 16.0 12.9
19.7 19.0 16.0
23.3 24.0 19.2
Tightening torque
N•m (kgf•cm)
14 to 18 (140 to 180)
33 to 42 (330 to 420)
50 to 62 (500 to 620)
63 to 77 (630 to 770)
– 12 –
Flare nut width
(mm)
D
13 17
20 22
20 24
23 27
34 36
D
C
Tightening torque of torque
wrenches available on the market
N•m (kgf•cm)
16 (160), 18 (180)
42 (420)
55 (550)
65 (650)