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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
Outdoor unit
Welding or Flaring
Indoor unit
Branch pipe
Welding or Flaring
Piping sizes at the branch pipe
Table 4-6
Refrigerant
A (TYPE)
Wall mounted 22~45
Wall mounted 56
Four-sided air outlet
28~45
Four-sided air outlet
56~80
One-sided air outlet
18~45
One-sided air outlet
56
Low static pressure
18~45
Low static pressure 56
Thin duct type 71
R410A
A5 duct type 22~45
A5 duct type 56~140
Four-way Cassette Type
15~45
Console Type 22~45
Tow-way Cassette Type
22~45
Tow-way Cassette Type
56~71
Ceiling And Floor Type
36~45
Ceiling And Floor Type
56~160
Expose And Concealed
Floor-standing type 22~45
Expose And Concealed
Floor-standing type 56~80
Pipe diameter of the connector in the outdoor unit's body
Piping connection
Pipe diameter of outdoor unit's connector(mm)
side
Model(kW)
20-22.4
26-28
33.5
Liquid side
Gas side
Welding or Flaring
Flaring
Flaring
Welding or Flaring
(A: the total capacity of indoor units)
Air Side (Φ)
Liquid Side (Φ)
12.7(Flaring nut)
6.4(Flaring nut)
15.9(Flaring nut)
9.5(Flaring nut)
12.7(Flaring nut)
6.4(Flaring nut)
15.9(Flaring nut)
9.5(Flaring nut)
12.7(Flaring nut)
6.4(Flaring nut)
15.9(Flaring nut)
9.5(Flaring nut)
12.7(Flaring nut)
6.4(Flaring nut)
15.9(Flaring nut)
9.5(Flaring nut)
15.9(Flaring nut)
9.5(Flaring nut)
12.7(Flaring nut)
6.4(Flaring nut)
15.9(Flaring nut)
9.5(Flaring nut)
12.7(Flaring nut)
6.4(Flaring nut)
12.7(Flaring nut)
6.4(Flaring nut)
12.7(Flaring nut)
6.4(Flaring nut)
15.9(Flaring nut)
9.5(Flaring nut)
12.7(Flaring nut)
6.4(Flaring nut)
15.9(Flaring nut)
9.5(Flaring nut)
12.7(Flaring nut)
6.4(Flaring nut)
15.9(Flaring nut)
9.5(Flaring nut)
Table 4-7
Gas Side
Liquid Side
Φ19.1
Φ9.53
Φ22.2
Φ9.53
Φ22.2
Φ12.7
Table 4-8
Capacity of
Outdoor Unit
Outdoor unit
(kW)
(horsepower)
20
22.4
26
28
33.5
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.
The indoor unit capacity total can not exceed 130% of the outdoor
unit load.
Overloading reduces the corresponding capacity.
Table 4-9
Capacity
Capacity
ranking
(horsepower)
18
22
28
36
45
56
71
When the outdoor unit connects one indoor unit
Table 4-10
The max height drop(m)
MODEL
(kW)
When outdoor
unit is top
20-33.5
25
4.6 Illustration
Outdoor Unit((Take Model 280 for example)
(280)
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.
14
Maximum
Sum Capacity
Quantity of
of Indoor unit
Indoor unit
(horsepower)
7
11
8
13
9
15
10
16
12
20
NOTE
Capacity
ranking
(horsepower)
0.6
80
0.8
90
1
100
1.3
112
1.6
120
2
125
2.5
140
The length of
refrigerant
When outdoor
pipe(m)
unit is bottom
20
50
N
1
(56)
a
L
Indoor unit
2
B
b
N
2
(56)
L
3
(45)
c
L
4
D
C
d
L
5
e
E
f
(45)
V.2
50%~130%
Capacity
2.8
3.2
3.5
4
4.3
4.5
5
The number
of bends
less than 10
N
3
N
4
(45)
N
N
5
6
(56)
Fig.4-6
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