Toshiba RAS-10UKV-E Service Manual page 9

Fig. 2-2-2 Relations between flare n ut 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 R-410A is the same as that for
conventional R-22. Incidentally, when the
torque is weak, the gas leakage may occur.
Table 2-2-7 Tightening torque of flare for R-410A [Reference v alues]
Nominal Outer diameter
diameter
1/4
3/8
1/2
5/8
Tightening torque
(mm) N·m (kgf·cm)
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)
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 2-2-7
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.
wrenches a vailable on the market
– 8 –
FILE NO. SVM-02007
Tightening torque of torque
N·m (kgf·m)
16 (160), 18 (180)
42 (420)
55 (550)
65 (650)