Toshiba RAS-M07G3DV-E Service Manual page 15

1) Copper pipe
<Piping>
The pipe thickness, flare finishing size, flare nut and
others differ according to a refrigerant type.
When using a long copper pipe for R32, it is
recommended to select "Copper or copper-base
pipe without seam" and one with bonded oil amount
40mg/10m or less.
Also do not use crushed, deformed, discolored
(especially inside) pipes.
(Impurities cause clogging of expansion valves and
capillary tubes.)
<Flare nut>
Use the flare nuts which are attached to the air
conditioner unit.
Be sure to select the pipes with copper thickness in
the table below since the pressure of an air
conditioner using R32 is higher than that of R22.
Nominal Outer diameter
diameter
1/2
3/8
1/2
5/8
Make sure not to use a thin copper pipe sach as
0.7 mm copper thichness in the market.
2) Joint
The flare joint and socket joint are used for joints of
the copper pipe.
The joints are rarely used for installation of the air
conditioner.
However clear impurities when using them.
Thickness (mm)
(mm)
R410A or R32
6.4 0.80
9.5 0.80
12.7 0.80
15.9 1.00
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