4
5
1~7
1~8
45%~130%
45%~130%
42
48
6
1~9
45%~130%
56
Outdoor Unit
(
kBtu/h
)
Capacity of
ODU
(horsepower)
Number
of IDUs
Sum Capacity
of IDUs
(horsepower)
0.8
1.25
1.6
3
3.2
3.6
4
22
0.6
18
90
36
45
100
112
80
Capacity
ranking
Capacity
(horsepower)
Capacity
ranking
Capacity
(horsepower)
Table 4-9
1
28
5
140
Table 4-10
When outdoor
unit is top
When outdoor
unit is bottom
less than 10
MODEL
(
kBtu/h
)
The max height drop(m)
The length of
refrigerant
pipe(m)
The number
of bends
42
48
56
20
30
30
20
20
20
40
60
60
When the outdoor unit connects one indoor unit
CAUTION
The total capacity of the IDUs must not exceed 130% of the load
of the ODU.
When the capacity of IDUs is greater than 100% of the load, the
output of the IDUs will be de-rated.
Main pipe (Please refer to Fig.4-5 and Fig.4-7)
In Fig.4-6, the main pipe L1, the outdoor unit capacity is
16kW, and check the Fig.4-7 to get the size of gas pipe/liquid
pipe is Φ19.1/Φ9.5, and also the total equivalent length of liquid
side and gas side pipes is >90m, then check the Fig.4-4 to get
the size of gas pipe/liquid pipe is Φ22.2/Φ9.5, and according to
the maximum value principle, it should apply the Φ22.2/Φ9.5.
4.6 Illustration
Caution: Suppose in the displayed piping system, the total equi-
valent piping length of air side + liquid side is longer than 90m.
Inner branch pipes are a~f, the size selection please refers to
Table4-6. Note: The max. length of the branch pipe should not
longer than 15m.
Indoor unit branch pipe
The main pipes of indoor unit and the indoor unit branch pipe
components
The downstream inner units of the main pipe L2 are N1, N2, and
its total capacity is 28×2=56, the size of pipe L2 is Φ15.9/Φ9.5,
and the branch pipe B should be FQZHN-01D.
The downstream inner units of the main pipe L4 are N3, N4, and
its total capacity is 28×2=56, the size of pipe L4 is Φ15.9/Φ9.5,
and the branch pipe D should be FQZHN-01D.
The downstream inner units of the main pipe L5 are N5, N6, and
its total capacity is 28+22=50, the size of pipe L5 is Φ15.9/Φ9.5,
and the branch pipe E should be FQZHN-01D.
The indoor unit below to the main pipe L3 are N3
～
N6, and its to-
tal capacity is 28×3+22=106, the size of pipe L3 is Φ15.9/Φ9.5,
and he branch pipe C should be FQZHN-01D.
The indoor unit below to the main pipe A are N1
～
N6, and its to-
tal capacity is 28×5+22=162, and the branch pipe should be
FQZHN-01D, and because the total piping length of air side
is ≥90m, check Table.4-4, and the first branch pipe should apply
FQZHN-02D, and according to the principle of maximum value, it
should apply FQZHN-02D.
28
36
20
10
20
10
40
20
28
36
45%~130%
45%~130%
1~4
1~6
2.5
3
Table 4-8
Fig.4-6
Piping
side
Φ15.9
Φ9.5
Φ15.9
Φ9.5
Φ19.1
Φ9.5
Pipe diameter of outdoor unit's connector(mm)
Φ15.9
Φ9.5
Φ15.9
Φ9.5
MODEL
(
kBtu/h
)
28
36
42
48
56
Table 4-7
Pipe diameter of the connector in the outdoor unit's body
Gas Side
Liquid Side
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 First Line Branch Pipe
Outdoor Unit(Take Model 56 for example)
Indoor Units
7
56
2
71
2.5
160
6