Toshiba RAV-SM562BT-E 43˚to 45˚, 2-6 Flare and flare nut dimensions for R22, Nominal, Thickness

Table 7-2-6 Flare and flare nut dimensions for R22

Nominal	Outer diameter			Thickness						Dimension (mm)					Flare nut width
diameter	(mm)				(mm)				A	B	C		D		(mm)
1/4	6.4		0.8					9.0		9.2	6.5		13		17
3/8	9.5		0.8					13.0		13.5	9.7		20		22
1/2	12.7		0.8					16.2		16.0	12.9		20		24
5/8	15.9		1.0					19.4		19.0	16.0		23		27
3/4	19.0		1.0					23.3		24.0	19.2		34		36
					˚
			to46
		˚
	45
						B	A					C		D

43˚to 45˚

Fig. 7-2-2 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 tighten- ing torque, comply with values designated by manufacturers. Table 7-2-7 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 7-2-7 Tightening torque of flare for R410A [Reference values]

Nominal	Outer diameter	Tightening torque	Tightening torque of torque
			wrenches available on the market
diameter	(mm)	N•m (kgf•m)
			N•m (kgf•m)
1/4	6.4	14 to 18 (1.4 to 1.8)	16 (1.6), 18 (1.8)
3/8	9.5	33 to 42 (3.3 to 4.2)	42 (4.2)
1/2	12.7	50 to 62 (5.0 to 6.2)	55 (5.5)
5/8	15.9	63 to 77 (6.3 to 7.7)	65 (6.5)

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