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4-7 Selection of parallel tube assembly and parallel tube diameter for outdoor units
Please select the tube as per the Tab.4.8.
No. of outdoor units
2 sets
3 sets
4 sets
Remark:Tube assemblies in the table above are the manufacturer special parts which must be separately ordered.
4-8 Example of a whole pipeline
E.g.: A combination of two modules (24HP+22HP) is herein used for explaining the selection of tubes.
Imagine the equivalent length of all tubes in the schematic system is larger than 90m.
W2
(22HP)
g2
1) Main branch tube for indoor units
1. The total capacity of downstream units N2 and N3 after the main tube L4 is 140+71=211, tube L4 is Ф19.1/Ф9.5, and manifold D is EVRI-BP1.
2. The total capacity of downstream units N1~ N3 after the main tube L3 is 140×2+71=351, tube L is Ф28.6/Ф12.7, and manifold C is
3. The total capacity of downstream units N5~N6 after the main tube L3 is 140+28=168, tube L6 is Ф19.1/Ф9.5, and manifold F is
4. The total capacity of downstream units N4~ N6 after the main tube L5 is 140×2+28=308, tube L5 is Ф22.2/Ф9.5, and manifold E is
5. The total capacity of downstream units N1~N6 after the main tube L2 is 140×4+71+28=659, tube L2 is Ф28.6/Ф15.9, and manifold B is
6. The total capacity of downstream units N and N
.
. The total capacity of downstream units N ~N
7
8. The total capacity of downstream units N ~N
9. The total capacity of downstream units N12 and N13 after the main tube L12 is 56×2=112, tube L12 is Ф15.9/Ф9.5, and manifold L is
.
10. The total capacity of downstream units N11~ N13 after the main tube L11 is 140+56×2=252, tube L11 is Ф22.2/Ф9.5, and manifold K is
11. The total capacity of downstream units N7~N13 after the main tube L7 is140×3+71+ 56×2+28=631, tube L7 is Ф28.6/Ф15.9, and manifold G is
EVRI-BP3.
.
12 The total capacity of downstream units N1~N13 after manifold A is 140×7+71×2+ 56×2+28×2=1290, and manifold A is
2) Main tube (refer to Tab.4.3/4.5/4.6)
The total capacity of upstream outdoor units before the main tube L1 in Fig.4.3 is 24+22=46HP, referring to Tab.4.5/4.6 it is known the gas tube/ liquid
tube=Ф38.1/Ф22.2 while the total capacity of downstream units is 140×7+71×2+56×28×2=1290, referring to Tab.4.3 it is known the gas tube/ liquid
tube=Ф38.1/Ф19.1, so according to the principle for selecting the larger one, the main tube specification is finally fixed in Ф38.1/Ф22.2.
3) Main tube for outdoor units
Referring to <Installation Instruction of Outdoor Manifold>, it is known that
4-9 Removal of impurities and water in the tube
1) Impurities may enter when the refrigerant tubes are being installed, so they must be cleaned before tubes are connected to each outdoor unit.
2) The pipeline can be cleaned by high pressure nitrogen gas other than the refrigerant of any outdoor unit.
Tab.4.8 Tube assemblies for multi-connected outdoor units
Legend
g1
g 2
Main tube
L
g 3
g 2
g 1
Main tube
M
L
G 1
g4
g 3
g 2
g 1
N
M
L
G2
G 1
W1
(24HP)
L2
g1
L
A
L1
L7
Figure 4.3
after the main tube L
9
10
after the main tube L is 140+71+28=239, tube L9 is Ф22.2/Ф9.5, and manifold I is
8
10
after the main tube L8 is 140×2+71+28=379, tube L8 is Ф28.6/Ф12.7, and manifold H is
7
10
Outdoor tube diameter (mm) Parallel manifold assembly
g1、g2:
8-12HP: Ф25.4/Ф12.7；
14-24HP: Ф31.8/Ф15.9；
26-32HP: Ф38.1/Ф19.1；
g1、g2、g3:
8-12HP: Ф25.4/Ф12.7；
14-24HP: Ф31.8/Ф15.9；
26-32HP: Ф38.1/Ф19.1；
G1: Ф41.2/Ф22.2
g1、g2、g3:
8-12HP: Ф25.4/Ф12.7；
14-24HP: Ф31.8/Ф15.9；
Main tube
G1: Ф38.1/Ф19.1；
G2: Ф41.2/Ф22.2
a
L4
C
L3
B
L6
E
L5
d
N7
(140)
L8
H
G
I
L9
L11
L12
L
K
N11
(140)
is 71+28=99, tube L10 is Ф15.9/Ф9.5, and manifold J is
10
9
g1: Ф38.1/Ф19.1; g2:Ф31.8 /Ф15.9; L: EVRO-BP2F
10
L:
EVRO-BP2F or
EVRO-BP2D
L+M:
EVRO-BP3F or
EVRO-BP3D
L+M+N:
EVRO-BP4D
N2
(140)
N1
c
b
(140)
D
F
e
N5
N4
(140)
(140)
N8
N9
(140)
h
(71)
i
N10
J
L10
j
(28)
m
l
N13
N12
(56)
(56)
3
EVRI-BP4.
Main tube
N3
(71)
f
N6
(28)
EVRI-BP3.
EVRI-BP1.
EVRI-BP2.
EVRI-BP3.
EVRI-BP1.
EVRI-BP2.
EVRI-BP3.
EVRI-BP1.
EVRI-BP2.
V.2
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