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2. Refrigerant Piping Materials
(1) Thickness of Refrigerant Piping
Although the thickness is same as
that for HCFC-22 model, as R410A
model features higher pressure, be
sure to confirm the thickness prior to
use.
Do not use thin pipes (thinner than
※
0.7 mm).
(2) Flare's Expansion Pipe
The projection when the new flare
tool is used, is as follows. When
using the conventional flare tool, be
sure to secure the following projection
by using a gauge for projection
adjustment.
When using the conventional flare
※
tool, use a gauge for projection
adjustment.
(3) Flare Nut Dimensions
Along with changes in the expansion
pipe dimensions, the opposite side
dimensions of flare nuts whose
nominal diameter is 1/2 change so
that different torque wrenches must
be used.
Figures in ( ) denote those for
※
HCFC-22.
Nominal
Outside
diameter
diameter (mm)
1/4
1/2
Projection "A"(mm) for Flare Tool for R410A
(Clutch Type)
1/4: 0-0.5
1/2: 0-0.5
Nominal
Opposite Side Dimensions (mm)
diameter
of Flare Nuts for R410A
1/4
3/8
1/2
30
Thickness
(mm)
6.35
0.8
12.70
0.8
17 (17)
22 (22)
26 (24)
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