Hitachi RAC-112SQB - Page 4

4
Copper pipe
Cap Nut
3) Use special parts for R410A in piping and connection. Both the cap nut and pipe flare are different, choose the correct
type according to the specifications below.
Unit: mm
Pipe Diameter
dΦ
Size
R407C/R22 R410A
6.35 9.0 9.1
9.53 13.0 13.2
12.7 16.2 16.6
15.88 19.4 19.7
19.05 23.3
※Cannot be
processed (1/2H
material)
※ Connect with the flare that comes with the product.
● Selection of pipe wall thickness
The wall thickness of pipes must be changed according to the design pressure change.
Wall thickness of copper piping for the new refrigerant (mm)
Pipe
Diameter
Current Refrigerant New Refrigerant
R22 R407C R410A
Wall
Thickness
Piping
Material
Wall
Thickness
Piping
Material
Wall
Thickness
Piping
Material
Φ6.35 0.6 O 0.8 O 0.8 O
Φ9.53 0.8 O 0.8 O 0.8 O
Φ12.7 0.8 O 0.8 O 0.8 O
Φ15.88 1.0 O 1.0 O 1.0 O
Φ19.05 1.0 O 1.0 O 1.0 1/2H
Φ22.2 1.2 O 1.15 O 1.0 1/2H
Φ25.4 1.2 O 1.0 1/2H 1.0 1/2H
Φ28.6 1.4 O 1.0 1/2H 1.0 1/2H
Φ31.75 1.4 O 1.1 1/2H 1.1 1/2H
Φ38.1 1.65 O 1.15 1/2H 1.35 1/2H
●
Connector Selection
The wall thickness of connectors (elbows and tubing) must be changed according to the design pressure change.
As 1/2H parts cannot be bend or expanded, select the appropriate tubing according to the minimum wall
thickness below. Please note that the sizes of some cap nuts also change.
Minimum wall thickness of connector (mm)
Pipe Diameter R407C/R22 R410A Pipe Diameter R407C/R22 R410A
Φ6.35 0.5 0.5 Φ22.2 0.9 0.9
Φ9.53 0.6 0.6 Φ25.4 0.95 0.95
Φ12.7 0.7 0.7 Φ28.6 1.0 1.0
Φ15.88 0.8 0.8 Φ31.75 1.05 1.1
Φ19.05 0.8 0.8 Φ38.1 1.25 1.35
Cap Nut Size B (mm)
Pipe Diameter
Cap Nut Size B (mm)
Pipe Diameter
Cap Nut Size B (mm)
R407C/R22 R410A R407C/R22 R410A
Φ6.35 17 17 Φ15.88 27 29
Φ9.53 22 22 Φ19.05 36 36
Φ12.7 24 26
Flare Size
+0
-0.4
Flare Size