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Table 4-1
The max height drop(m)
MODEL
(kW)
When outdoor
When outdoor
unit is top
unit is bottom
20-33.5
25
Requirement :
The largest level difference between
indoor unit and outdoor unit should not exceed 25m (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 4.11 is set every 10m in the gas pipe of the main
pipe.
R
D
Table 4.2
Φ19.1 Φ22.2 Φ25.4 Φ28.6 Φ31.8 Φ38.1
D
≥31
≥45
R
≥300
H
Max. pipe length
L ≤ 50m
Indoor unit
Fig. 4.10
The length of
refrigerant
pipe(m)
20
50
R
D
Fig 4.11
Unit: mm
≥60
4.3.3 Piping diameter
1) Select the diameter of the main piping
Table 4-3
Piping connection
side
Model(kW)
20-22.4
28
33.5
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 4-4
Piping outer
diameter (mm)
Φ
6.35
Φ
9.52
Φ
12.7
Φ
15.9
Φ
19.1
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.
2) Indoor unit auxiliary connection pipe
Table 4-5
Indoor unit capacity
(kW)
20-22.4
28
33.5
15
Pipe diameter of outdoor
unit's connector(mm)
Gas Side
Liquid Side
Φ19.1
Φ9.52
Φ22.2
Φ12.7
Φ25.4
Φ12.7
Minimum
Temper grade
thickness (mm)
0.80
0.80
1.00
M-type
1.00
1.00
Gas side
Liquid side
(mm)
(mm)
Φ19.1
Φ9.52
Φ22.2
Φ12.7
Φ25.4
Φ12.7
V.1
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