6
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.
NOTE
Connection method
Flaring
Welding or Flaring
Flaring
Flaring
Flaring
Flaring
42
kBtu/h
Branch pipe
Indoor unit
48
kBtu/h
56
kBtu/h
Gas side
Liquid side
Table 4-5
Piping sizes at the branch pipe
Flaring
Flaring
28
kBtu/h
36
kBtu/h
Flaring
Welding or Flaring
Flaring
Flaring
Flaring
Flaring
12.7(Flaring nut)
A≤45
R410A
A≥56
6.4(Flaring nut)
15.9(Flaring nut)
9.5(Flaring nut)
Gas Side (Φ)
Liquid Side (Φ)
Table 4-6
Indoor Unit Capacity
A(x100W)
Refrigerant
The first connect method (Welding)
a
b
c
e
f
d
L
1
L
2
L
3
L
4
L
5
A
B
C
D
E
NOTE
4.4 Confirmation for the diameters of indoor
unit connecting pipes
A 160
160≤A 230
Total capacity of
the downstream
inner units
Main pipe size
（
mm
）
Iiquid pipe
Φ15.9
Φ9.5
Φ9.5
Branch Pipe
FQZHN-01D
FQZHN-01D
Φ19.1
R410A Indoor unit connecting pipes diameters
1) R410A Indoor unit connecting pipes diameters 4-3
。
2) Example 1
：
In the Fig.4-5,The downstream inner units of the L2,
and its total capacity is 28×2
＝
56
，
refers to the Table 4.4, the
air/liquid side of L2 is
：
Φ15.9/Φ9.5
。
N
1
(28)
N
3
(28)
N
5
(28)
N
6
(22)
N
2
(28)
N
4
(28)
A
B
D
E
C
a
b
c
e
f
d
L
1
L
2
L
5
L
3
L
4
The straight distance between copper pipe turning and the
contiguous branch pipe is at least 0.5 m.
The straight distance between the contiguous branch pipes is at
least 0.5 m.
The straight distance which the branch pipes connected to the
IDU is at least 0.5 m.
air side
(mm)
liquid si-
de
(mm)
A 155
155≤A 230
Φ15.9
Φ9.5
Φ19.1
Φ9.5
FQZHN-01D
FQZHN-01D
FQZHN-01D
FQZHN-02D
Φ19.1
Φ9.5
Φ22.2
Φ9.5
Main pipe size when the tot-
al equivalent piping length
of air side is <90m
The First Line Branch Pipe
The First Line Branch Pipe
Outdoor Unit(Take Model 56 for example)
The second connect method (Welding)
Indoor Units
Fig. 4-4
Fig. 4-5
Use the special-purpose branch branches provided by Intensity
only. Failing to do so may lead to severe system malfunction.
If the distance from the first branch pipe to the last IDU exceeds
15 m, use connection method 2.
The connection distance between the IDU and branch pipe
should not exceed 15 m.
Table 4-3
Air pipe
R410A outdoor unit connecting pipes diameters
Total capa-
ctiy of The
outdoor
units
Table 4-4
Main pipe size when the tot-
al equivalent piping length
of air side is ≥90m
air side
(mm)
liquid si-
de
(mm)
The first Line
Branch Pipe
The first Line
Branch Pipe
4.5 Confirmation for the diameters of outdoor
unit connecting pipes
Outdoor Unit
L
1
a
b
c
d
e
f
Outdoor Unit
The third connect methond(Flaring)