Toshiba HWS-1402XWHT9-E, HWS-802H-E Processing of piping materials, Flare and precautions, Figure

2-2-2. Processing of piping materials

When installing refrigerant pipe, prevent water or dust from entering the pipe, and do not use oil other than lubricant used for Air to Water Heat Pump. Make sure that no refrigerant leak occurs.

If piping needs lubrication, use lubricating oil whose water content is removed.

After the oil is put in, be sure to seal the container with airproof cover or other covers.

Flare and precautions

1)Cut a pipe.

Cut slowly with a pipe cutter so that the pipe is not distorted.

2)Remove burr and flaw.

A burr or flaw in a flare part may cause refrigerant leak. Remove carefully all the burrs, and clean up the cut ends before installation.

3)Insert a flare nut.

4) Flare	Figure 2-2-1
Check that the clasps and copper pipe are clean. Flare
	Flare dimension
correctly using the clasp. Use a flare tool for R410A or the
conventional one. Flare processing dimension varies		D	A
depending on the flare tool type. When using the

conventional flare tool, use a gauge for size adjustment to secure the A dimension.

Table 2-2-3 Flare processing related dimension for R410A

				A (mm)
Nominal	Outer diameter	Wall thickness
			Flare tool for R410A	Conventional flare tool
diameter	(mm)	(mm)
			clutch type	Clutch type	Butterfly-nut type
3/8	9.52	0.8	0 to 0.5	1.0 to 1.5	2.0 to 2.5
5/8	15.9	1.0	0 to 0.5	1.0 to 1.5	2.0 to 2.5

Table 2-2-4 Dimension of flare for R410A and flare nut

Nominal	Outer diameter	Wall thickness		Dimension (mm)			Flare nut width
diameter	(mm)	(mm)	A	B	C	D	(mm)
3/8	9.52	0.8	13.0	13.2	9.7	20	18
5/8	15.9	1.0	19.1	19.7	15.9	24.5	26

Figure 2-2-2 Relationship between flare nut and flare surface

46°
-
45°
B A	C D

43° -45°

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