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The straight distance between the contiguous branchpipes is at
least 0.5m;
The straight distance which the branch pipes connected to the
indoor unit is at least 0.5m;
Branch header must be connected with indoor units directly,
the further branch connection is not allowed.
Select branch joint
Select the branch joint according to the total designed capacity
of indoor units which it connects to. If this capacity is more than
that of the outdoor unit, then select the connection according to
the outdoor unit.
The selection of branch header depends on the quantity of
branches it connects to.
Connection method
Table 4-5
8kW
10.5kW
12kW
14kW
16kW
18kW
Indoor unit
Branch pipe
Welding or Flaring
Piping sizes at the branch pipe
Table 4-6
Indoor Unit Capacity
Refrigerant
A(x100W)
A≤45
R410A
A≥56
Pipe diameter of the connector in the outdoor unit's body
R410A
Piping
Pipe diameter of outdoor unit's connector(mm)
side
MODEL
Gas Side
(kW)
8
10.5
12
14
16
18
Liquid side
Gas side
Flaring
Flaring
Flaring
Flaring
Flaring
Flaring
Flaring
Flaring
Flaring
Flaring
Flaring
Flaring
Flaring
Flaring
Welding or Flaring
Gas Side (Φ)
Liquid Side (Φ)
12.7(Flaring nut)
6.4(Flaring nut)
15.9(Flaring nut)
9.5(Flaring nut)
Table 4-7
Liquid Side
Φ15.9
Φ9.5
Φ15.9
Φ9.5
Φ15.9
Φ9.5
Φ15.9
Φ9.5
Φ19.1
Φ9.5
Φ19.1
Φ9.5
Table 4-8
Capacity of
Outdoor Unit
Outdoor unit
(kW)
(horsepower)
8
10.5
12
14
16
18
(The quantity of indoor unit more than or equal to two, each indoor unit
of capacity should be not more than 8.0kW.)
When capacity of indoor unit greater than the sum of 100%, capacity
of indoor unit will be attenuated.
When capacity of indoor unit greater than or equal to the sum of
120%, in order to ensure the effectiveness of machine, and then try to
open the indoor units at different time.
When the capacity of indoor unit is greater than or equal to 16.8kW,
the caliber of primary gas pipe should be augmented from
Table 4-9
Capacity
Capacity
ranking
(horsepower)
18
22
28
36
45
56
When the outdoor unit connects one indoor unit
Table 4-10
The max height drop(m)
MODEL
(kW)
When outdoor
unit is top
25
8
10.5
25
12
25
14
25
25
16
25
18
4.6 Illustration
Outdoor Unit((Take Model 160 For Example)
L
1
A
The First Line Branch Pipe
Caution: Suppose in the displayed piping system, the total equi-
valent piping length of air side + liquid side is longer than 90m.
8
Maximum
Sum Capacity
Quantity of
of Indoor unit
Indoor unit
(horsepower)
4
2.5
45%~130%
5
3
45%~130%
4
6
45%~130%
5
6
45%~130%
6
7
45%~130%
6.5
9
45%~130%
Capacity
ranking
80
0.6
10.5
0.8
1
120
1.25
140
160
1.7
2
The length of
refrigerant
When outdoor
pipe(m)
unit is bottom
20
50
50
20
20
50
20
50
20
50
20
50
N
1
(28)
a
L
2
B
b
N
2
(28)
L
3
c
L
4
D
C
d
L
5
e
E
f
16 to
19.
Φ
Φ
Capacity
(horsepower)
2.5
3
4
5
6
The number
of bends
less than 10
Indoor units
N
3
(28)
N
4
(28)
N
N
5
6
(28)
(22)
Fig.4-6
V.2
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