Hitachi RAS-3HVRNM2, Installation & Maintenance Manual, Page: 25 / 58

TC-12001 2-97
OUTDOOR UNIT
P5414950-rev.1 21
Table 6.2 Piping Size of Indoor Unit
(mm)
Indoor Unit HP Gas Liquid
0.8 to 1.5
I
12.7
I
6.35
2.0
I
15.88
I
6.35
2.5 to 7.0
I
15.88
I
9.52
O
Piping Thickness and Material
Use the pipe as below.
(mm)
Diameter
R410A
Thickness Material
I
6.35 0.8 O material
I
9.52 0.8 O material
I
12.7 0.8 O material
I
15.88 1.0 O material
Table 6.1 Piping Size of Outdoor Unit
Outdoor Unit HP Gas Liquid Max. Piping Length
Max Lift between Outdoor Unit
and Indoor Unit
3
I
15.88
I
9.52
Actual Length < 50m
Equivalent Length < 70m
O.U is Higher than I.U < 30m
I.U is Higher than O.U < 20m
4 to 7
I
15.88
I
9.52
Actual Length < 75m
Equivalent Length < 95m
O.U is Higher than I.U < 30m
I.U is Higher than O.U < 20m
I.U.: Indoor Unit
O.U.: Outdoor Unit
O
Flaring Dimension
3HUIRUPWKHÀDULQJZRUNDVVKRZQEHORZ
(mm)
Diameter
(
I
d)
A
+0
-0.4
R410A
6.35 9.1
9.52 13.2
12.7 16.6
15.88 19.7
6.2 Flaring and Joint
O
Joint Selection
,I\RXXVH+PDWHULDO\RXFDQQRWSHUIRUPWKHÀDULQJZRUN,QWKLVFDVHXVHDMRLQWVHOHFWHGIURPWKH
chart below.
< Minimum Thickness of Joint (mm) >
Diameter R410A
I
6.35 0.5
I
9.52 0.6
I
12.7 0.7
I
15.88 0.8
I
19.05 0.8
< Flare Nut Dimension B (mm) >
Diameter R410A
I
6.35 17
I
9.52 22
I
12.7 26
I
15.88 29
I
19.05 36
Material is based on JIS B8607.
Do not use a thin pipe other
than shown in the left table.
0.4 ~ 0.8R
I
A
I
d
90 o
+ 2
o
45
o
+ 2
o
B
Flare Nut