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Table 4.3 Pipe size allowable increase diameters (mm)
Φ9.52 to Φ12.7
Φ12.7 to Φ15.9
Φ19.1 to Φ22.2
Φ22.2 to Φ25.4
Φ28.6 to Φ31.8
Φ31.8 to Φ38.1
Φ41.3 to Φ44.5
Φ44.5 to Φ50.8
Requirement:
The largest level difference between
indoor unit and outdoor unit should not exceed 30m (if
the outdoor unit is above) or 20m (if the outdoor unit is
below). Additionally: If the outdoor unit is above and the
level difference is greater than 20m, it is recommended
that an oil return bend with dimensions as specified in
Figure 4.12 is set every 10m in the gas pipe of the main
pipe.
R
D
Table 4.4
Φ19.1 Φ22.2 Φ25.4 Φ28.6 Φ31.8 Φ38.1
D
R
≥31
H
≥300
Φ41.3
Φ44.5
D
R
≥80
H
≥500
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 the Table 4.5 and Table
4.6.
Table 4.5
Equivalent length between the farthest indoor
unit and the outdoor unit< 90m
HP of
ODU
Gas side
Liquid side
(mm)
14HP
Φ25.4
Φ12.7
16HP
Φ28.6
Φ12.7
20HP
Φ28.6
Φ15.9
Table 4.6
Equivalent length between the farthest indoor
unit and the outdoor unit≥ 90m
HP of
ODU
Gas side
Liquid side
(mm)
14HP
Φ28.6
Φ12.7
16HP
Φ31.8
Φ12.7
Φ31.8
Φ15.9
20HP
Φ15.9 to Φ19.1
Φ25.4 to Φ28.6
Φ38.1 to Φ41.3
Φ50.8 to Φ54.0
R
D
Fig 4.12
Unit: mm
≥45
≥60
Φ50.8
Φ54.0
Φ63.5
≥90
The first indoor
(mm)
branch joint
FQZHN-02D
FQZHN-03D
FQZHN-03D
The first indoor
(mm)
branch joint
FQZHN-03D
FQZHN-03D
FQZHN-03D
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
Total capacity of
Capacity of indoor unit
indoor units
(mm)
A (×100W)
A<168
Φ15.9
168≤A<224
Φ19.1
224≤A<330
Φ22.2
330≤A<470
Φ28.6
Φ28.6
470≤A≤560
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.
Table 4.8
Piping outer
Minimum
thickness (mm)
diameter (mm)
0.80
6.35
Φ
0.80
9.52
Φ
1.00
12.7
Φ
1.00
15.9
Φ
1.00
Φ
19.1
1.00
22.2
Φ
1.00
25.4
Φ
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
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).
Liquid side
(mm)
Branch joint
Φ9.52
FQZHN-01D
Φ9.52
FQZHN-01D
Φ9.52
FQZHN-02D
Φ12.7
FQZHN-03D
Φ15.9
FQZHN-03D
Temper grade
M-type
Y2-type
V.1
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