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4.3.3 Piping diameter
1) Select the diameter of the main piping
▪
The main pipe (L1) and first indoor branch joint (A)
should be sized according to Table 4.6 and Table 4.7.
Table 4.6
Equivalent length of all liquid piping < 90 m
Gas side
Liquid side
ODU
(mm)
(mm)
8HP
Φ19.1
Φ9.52
10HP
Φ22.2
Φ9.52
Φ25.4
Φ12.7
12~14HP
Φ28.6
Φ12.7
16HP
18HP
Φ28.6
Φ15.9
Φ28.6
Φ15.9
20~24HP
Φ31.8
26~34HP
Φ19.1
36~54HP
Φ38.1
Φ19.1
56~66HP
Φ41.3
Φ19.1
68~82HP
Φ44.5
Φ22.2
84~88HP
Φ50.8
Φ25.4
90~92HP
Φ50.8
Φ25.4
94~96HP
Φ50.8
Φ25.4
Φ54.0
Φ28.6
Table 4.7
Equivalent length of all liquid piping ≥ 90 m
Gas side
Liquid side
ODU
(mm)
(mm)
8HP
Φ12.7
Φ22.2
10HP
Φ12.7
Φ25.4
12~14HP
Φ28.6
Φ15.9
16HP
Φ31.8
Φ15.9
18HP
Φ31.8
Φ15.9
20~24HP
Φ31.8
Φ19.1
26~34HP
Φ38.1
Φ22.2
36~54HP
Φ41.3
Φ22.2
Φ44.5
Φ22.2
56~66HP
68~82HP
Φ50.8
Φ25.4
84~88HP
Φ25.4
Φ54.0
90~92HP
Φ54.0
Φ25.4
94~96HP
Φ54.0
Φ28.6
Φ63.5
Φ28.6
2) Select the branch joint diameters for the indoor unit
Based on the total capacity of the indoor unit, select the
branch joint for the indoor unit from the following table.
Table 4.8
Total capacity of
Capacity of indoor unit
The first indoor
branch joint
EVRI-BP1
EVRI-BP2
1040≤A<1540
EVRI-BP2
1540≤A<1900
EVRI-BP3
1900≤A<2350
EVRI-BP3
2350≤A<2500
EVRI-BP3
2500≤A<3024
EVRI-BP3
EVRI-BP4
EVRI-BP5
If the size of the branch joint pipe selected according to
EVRI-BP5
the above table is larger than that of the main pipe
EVRI-BP6
according to Table 4.6 or Table 4.7, the size of the
branch joint pipe should be reduced to make it the same
EVRI-BP6
as the main pipe.
EVRI-BP6
EVRI-BP7
The pipe thickness of the refrigerant piping shall
comply with the applicable legislation.
The minimal pipe thickness for R410A piping must be
in accordance with the table below.
Table 4.9
The first indoor
branch joint
EVRI-BP2
EVRI-BP2
EVRI-BP3
EVRI-BP3
EVRI-BP3
EVRI-BP3
EVRI-BP4
EVRI-BP5
EVRI-BP5
EVRI-BP6
EVRI-BP6
EVRI-BP6
EVRI-BP7
EVRI-BP7
Material: Only seamless phosphorus-deoxidized
copper piping that complies with all applicable
legislation should be used.
Thicknesses: Temper grades and minimum
thicknesses for different diameters of piping should
comply with local regulations.
Design pressure of R410 refrigerant is 4.2MPa
(42bar).
22
Gas side
Liquid side
indoor units
(mm)
(mm)
A (×100W)
A<168
Φ15.9
Φ9.52
168≤A<224
Φ19.1
Φ9.52
224≤A<330
Φ22.2
Φ9.52
330≤A<470
Φ12.7
Φ28.6
Φ28.6
Φ15.9
470≤A<710
710≤A<1040
Φ19.1
Φ31.8
Φ19.1
Φ38.1
Φ19.1
Φ41.3
Φ22.2
Φ44.5
Φ22.2
Φ50.8
Φ50.8
Φ25.4
3024≤A
Φ54.0
Φ28.6
Piping outer
Minimum
diameter (mm)
thickness (mm)
0.80
6.35
Φ
0.80
9.52
Φ
1.00
12.7
Φ
1.00
15.9
Φ
1.00
19.1
Φ
1.00
22.2
Φ
1.00
Φ
25.4
1.00
28.6
Φ
1.25
31.8
Φ
1.25
34.9
Φ
1.50
38.1
Φ
1.50
41.3
Φ
1.50
44.5
Φ
1.80
Φ
50.8
1.80
54.0
Φ
Branch joint
EVRI-BP1
EVRI-BP1
EVRI-BP2
EVRI-BP3
EVRI-BP3
EVRI-BP3
EVRI-BP4
EVRI-BP5
EVRI-BP5
EVRI-BP6
EVRI-BP6
EVRI-BP7
Temper grade
M-type
Y2-type
V.1
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