Thickness Of Refrigerant Piping; Flare's Expansion Pipe; Flare Nut Dimensions - Hitachi RAF-35NH5 Service Manual

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
0.7 mm).

2) Flare's Expansion Pipe

The projection when the new flare
tool is used, is as follows.
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.
thinner than
When
Nominal
diameter
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
diameter
1/4
3/8
1/2
- 24 -
Outside Thickness
diameter mm) mm)
6.35
12.70
Opposite Side Dimensions
of Flare Nuts for R410A
17 17)
22 22)
26 24)
0.8
0.8
mm)