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Table 4.5
Equivalent length between the farthest indoor
unit and the outdoor unit< 90m
HP of
ODU
Gas side
Liquid side
(mm)
(mm)
8HP
Φ19.1
Φ9.52
10HP
Φ22.2
Φ9.52
12-14HP
Φ25.4
Φ12.7
16HP
Φ28.6
Φ12.7
Φ28.6
Φ15.9
18~22HP
Table 4.6
Equivalent length between the farthest indoor
unit and the outdoor unit≤ 90m
HP of
ODU
Gas side
Liquid side
(mm)
(mm)
8HP
Φ22.2
Φ12.7
10HP
Φ25.4
Φ12.7
12-14HP
Φ28.6
Φ12.7
16HP
Φ31.8
Φ12.7
Φ31.8
Φ15.9
18~22HP
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 4.7
Gas side
Liquid side
Total capacity of
Capacity of indoor unit
(mm)
(mm)
indoor units
A (×100W)
A<168
Φ15.9
168≤A<224
Φ19.1
224≤A<330
Φ22.2
Φ12.7
330≤A<470
Φ28.6
470≤A<710
Φ28.6
Φ15.9
710≤A<1040
Φ19.1
Φ31.8
1040≤A<1540
Φ19.1
Φ38.1
Φ19.1
1540≤A<1900
Φ41.3
1900≤A<2350
Φ22.2
Φ44.5
Φ22.2
Φ50.8
2350≤A<2500
Φ50.8
Φ25.4
2500≤A<3024
Φ54.0
Φ28.6
3024≤A
If the size of the branch joint pipe selected according to
the above table is larger than that of the main pipe
according to Table 4.5 or 4.6, the size of the branch joint
pipe should be reduced to make it the same as the main
pipe.
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.
The first indoor
branch joint
EVRI-BP1
EVRI-BP2
EVRI-BP2
EVRI-BP3
EVRI-BP3
The first indoor
branch joint
EVRI-BP2
EVRI-BP2
EVRI-BP3
EVRI-BP3
EVRI-BP3
Branch joint
EVRI-BP1
Φ9.52
Φ9.52
EVRI-BP1
Φ9.52
EVRI-BP2
EVRI-BP3
EVRI-BP3
EVRI-BP3
EVRI-BP4
EVRI-BP5
EVRI-BP5
EVRI-BP6
EVRI-BP6
EVRI-BP7
20
Table 4.8
Piping outer
Minimum
diameter (mm)
thickness (mm)
0.80
6.35
Φ
0.80
9.52
Φ
1.00
Φ
12.7
1.00
15.9
Φ
1.00
19.1
Φ
1.00
22.2
Φ
1.00
25.4
Φ
1.00
28.6
Φ
1.25
31.8
Φ
1.25
Φ
34.9
1.50
38.1
Φ
1.50
41.3
Φ
1.50
44.5
Φ
1.80
50.8
Φ
1.80
Φ
54.0
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).
If the required pipe size is not available, you can use
other diameters by considering the following factors:
▪
In case the standard size is not available in local
market, one size up of gas pipe, and one size
down of liquid pipe should be used.
▪ In some conditions, the pipe size needs to be one
size up than the standard size that is the "Size up
Size" (for example: when the equivalent length
between the farthest indoor unit and the first
outdoor unit is larger than 90m, the pipe size
needs to be one size up; when the piping length
from the farthest indoor unit to the first indoor unit
is more than 40m, the indoor main pipe size
needs to be one size up to allow the piping length
up to 90m). In case the "Size up Size" is not
available in the local market, the standard size
pipe must be used.
▪ Pipe sizes bigger than corresponding "Size up
Size" cannot be used under any circumstances.
▪ Calculation for the additional refrigerant must be
adjusted according to section 5.9 on the
determination
of
the
additional
volume.
3) Indoor unit auxiliary connection pipe
Table 4.11
Gas side
Indoor unit capacity
(mm)
A (×100W)
A≤56
Φ12.7
56<A≤160
Φ15.9
Temper grade
M-type
Y2-type
refrigerant
Liquid side
(mm)
Φ6.35
Φ9.52
V.1
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