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4.3.2 Allowable length and height difference for refrigerant piping
Refer to the following table and figure (for reference only) to determine the appropriate size.
The equivalent length of each elbow and U-shape branch joint is 0.5m, and the equivalent length of each branch
header is 1m.
Install the indoor units such that they are as equidistant as possible on both sides of the U-shape branch joint.
When the outdoor unit is above the indoor unit, and the level difference exceeds 20 m, it is recommended that an
oil return bend be set up at every 10 m interval on the gas pipe of the main piping. The recommended
specifications of the oil return bend are shown in Figure 4.8.
The allowable length of the farthest indoor unit to the first branch joint in the system should be equal to or less than
40m unless specified conditions are met, in which case the permitted length is up to 120m. Please refer to
requirement 2.
Special-purpose branch joints from the manufacturer should be used for all branch joints. Failing to do so may
lead to severe system malfunction.
Piping diagram of JR8V combinable series
W3
W2
W1
g3
g1
g2
M
G1
Pipe
Branch
Indoor Unit
Piping diagram of JR8V individual series
W1
L1
Pipe
Branch
Indoor Unit
Table 4.2
Pipe and Component Names
Name
Outdoor unit connection pipe
Outdoor unit branch joint
Main pipe
NOTE
L3
L2
L1
B
L
A
L6
a
N1
Equivalent length of piping between the farthest indoor unit and the first
F
outdoor branch joint≤260m.
Piping between the farthest indoor unit and the first indoor branch joint≤120m.
L8
L7
G
f
g
N7
N6
L4
L3
L2
C
B
A
L6
b
a
N1
N2
Equivalent length of piping between the farthest indoor unit and the first
F
outdoor branch joint≤260m.
Piping between the farthest indoor unit and the first indoor branch joint≤120m.
L8
L7
H
G
f
h
g
N7
N6
Designation
Name
G1, g1, g2, g3
Indoor unit main pipe
L, M
Indoor unit branch joint
L1
Indoor unit auxiliary connection pipe
20
L5
L4
E
D
C
b
c
d
N2
N3
N4
L10
L9
J
I
H
h
i
j
N8
N9
N10
L5
E
D
e
d
c
N3
N5
N4
L10
L9
J
I
k
j
i
N9
N11
N8
N10
Designation
L2 to L10
A to J
a to k
e
N5
k
N11
Figure 4.6
Figure 4.7
V.1
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