6-2-2.Processing Of Piping Materials - Toshiba HWT-601XWHM3W-ETR Service Manual

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
Nominal Outer diameter
diameter (mm)
1/4 6.4
1/2 12.7
5/8 15.9
Outer diameter
Nominal diameter
1/4
1/2
5/8
Outer diameter
Nominal diameter
1/4
1/2
5/8
Thickness
Flare tool for
(mm)
R410A, R22
clutch type
0.8 0 to 0.5
0.8 0 to 0.5
1.0 0 to 0.5
Table 6-2-4 Flare and flare nut dimensions for R410A or R32
Thickness
(mm) (mm)
6.4 0.8
12.7 0.8
15.9 1.0
Table 6-2-5 Flare and flare nut dimensions for R22
Thickness
(mm) (mm)
6.4 0.8
12.7 0.8
15.9 1.0
Fig. 6-2-2 Relations between flare nut and flare seal surface
Fig. 6-2-1 Flare processing dimensions
Conventional flare tool
(R410A or R32)
Clutch type
1.0 to 1.5
1.0 to 1.5
1.0 to 1.5
Dimension (mm)
A
9.1 9.2
16.6 16.0
19.7 19.0
Dimension (mm)
A
9.1 9.2
16.2 16.0
19.4 19.0
A B
42
DIA D
A (mm)
Conventional flare tool
Wing nut type Clutch type
1.5 to 2.0 0.5 to 1.0
2.0 to 2.5 0.5 to 1.0
2.0 to 2.5 0.5 to 1.0
B C D
6.5 13
12.9 23
16.0 25
B C D
6.5 13
12.9 20
16.0 23
C D
A
(R22)
Wing nut type
1.0 to 1.5
1.5 to 2.0
1.5 to 2.0
Flare nut width
(mm)
17
26
29
Flare nut width
(mm)
17
24
27