Hitachi RAF-25NH4 Données Techniques page 32

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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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Raf-50nh4Rad-25qh4Rad-40qh4Ram-70qh4Ram-80qh4

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