Toshiba HWT-601XWHT6W-E - 6-2-2.Processing of Piping Materials

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6-2-2. Processing of piping materials
When performing the refrigerant piping installation, care should be taken to ensure that water or dust does not enter
the pipe interior, that no other oil other than lubricating oils used in the installed Air to Water Heat Pump is used,
and that refrigerant does not leak.
When using lubricating oils in the piping processing, use such lubricating oils whose water content has been
removed. When stored, be sure to seal the container with an airtight cap or any other cover.
(1) Flare processing procedures and precautions
a)Cutting the pipe
By means of a pipe cutter, slowly cut the pipe so that it is not deformed.
b)Removing burrs and chips
If the flared section has chips or burrs, refrigerant leakage may occur.
Carefully remove all burrs and clean the cut surface before installation.
c) Insertion of flare nut
d)Flare processing
Make certain that a clamp bar and copper pipe have been cleaned.
By means of the clamp bar, perform the flare processing correctly.
Use either a flare tool for R410A / R32 or conventional flare tool.
Flare processing dimensions differ according to the type of flare tool.
When using a conventional flare tool, be sure to secure “dimension A”
by using a gauge for size adjustment.
Table 6-2-3 Dimensions related to flare processing for R410A or R32 / R22
Table 6-2-4 Flare and flare nut dimensions for R410A or R32
Table 6-2-5 Flare and flare nut dimensions for R22
Fig. 6-2-2 Relations between flare nut and flare seal surface
Nominal
diameter
Outer diameter
(mm)
Thickness
(mm)
A (mm)
Flare tool for
R410A, R22
clutch type
Conventional flare tool
(R410A or R32)
Conventional flare tool
(R22)
Clutch type Wing nut type Clutch type Wing nut type
1/4 6.4 0.8 0 to 0.5 1.0 to 1.5 1.5 to 2.0 0.5 to 1.0 1.0 to 1.5
1/2 12.7 0.8 0 to 0.5 1.0 to 1.5 2.0 to 2.5 0.5 to 1.0 1.5 to 2.0
5/8 15.9 1.0 0 to 0.5 1.0 to 1.5 2.0 to 2.5 0.5 to 1.0 1.5 to 2.0
Nominal diameter
Outer diameter
(mm)
Thickness
(mm)
Dimension (mm)
Flare nut width
(mm)
ABCD
1/4 6.4 0.8 9.1 9.2 6.5 13 17
1/2 12.7 0.8 16.6 16.0 12.9 23 26
5/8 15.9 1.0 19.7 19.0 16.0 25 29
Nominal diameter
Outer diameter
(mm)
Thickness
(mm)
Dimension (mm)
Flare nut width
(mm)
ABCD
1/4 6.4 0.8 9.1 9.2 6.5 13 17
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
A
DIA D
Fig. 6-2-1 Flare processing dimensions
DCA B
45° to 46°
43° to 45°