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18
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Piping installation
18.1.5 Refrigerant piping length and height difference
Installer and user reference guide
84
The piping lengths and height differences must comply with the following
requirements.
Maximum actual piping length
▪
Example 1, unit 8: a+b+c+d+e+f+g+p≤Limit
▪
Example 2, unit 6: a+b+h≤Limit
▪
Example 2, unit 8: a+i+k≤Limit
▪
Example 3, unit 8: a+i≤Limit
Maximum equivalent piping length
Maximum total piping length
▪
Example 1: a+b+c+d+e+f+g+h+i+j+k+l+m+n+p≤Limit
Maximum length first branch kit-indoor unit
▪
Example 1, unit 8: b+c+d+e+f+g+p≤Limit
▪
Example 2, unit 6: b+h≤Limit
▪
Example 2, unit 8: i+k≤Limit
▪
Example 3, unit 8: i≤Limit
Maximum height difference
outdoor-indoor
(a)
Assume equivalent piping length of refnet joint=0.5 m and refnet header=1 m (for
calculation purposes of equivalent piping length, not for refrigerant charge calculations).
a
b
c
d
A
B
C
h
i
j
1
2
3
18‒1 Example 1: in case of refnet joints only
Refnet joint
1~8 VRV DX indoor units
a
H1
c
d
1
2
18‒2 Example 2: in case of refnet joints and header
Refnet joint
Refnet header
1~8 VRV DX indoor units
a
b
c
d
e
1
2
3
4
18‒3 Example 3: in case of refnet header only
Requirement
(a)
Outdoor higher than indoor
▪
Examples: H1≤Limit
Outdoor lower than indoor
e
f
g
p
D
E
F
G
k
l
m
n
4
5
6
7
8
H2
i
A
B
k
b
j
7
8
H2
e
f
g
h
3
4
5
6
H1
f
g
h
i
5
6
7
8
H2
H1
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600330-1D – 2023.02
Limit
120 m
150 m
300 m
40 m
50 m
40 m
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