18
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Piping installation
Installer and user reference guide
80
RXYSA4~6A7V/Y1B
VRV 5-S system air conditioner
4P600330-1 – 2020.01
18.1.5 Refrigerant piping length and height difference
The piping lengths and height differences must comply with the following
requirements.
Requirement
Limit
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
120 m
Maximum equivalent piping length
(a)
150 m
Maximum total piping length
▪
Example 1: a+b+c+d+e+f+g+h+i+j+k+l+m+n+p≤Limit
300 m
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
40 m
Maximum height difference
outdoor-indoor
Outdoor higher than indoor
▪
Examples: H1≤Limit
50 m
Outdoor lower than indoor
40 m
(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
A
h
i
j
k
l
m
n
B
C
D
E
F
G
p
b
c
d
e
f
1
2
3
4
5
6
7
8
g
H1
H2
18‒1 Example 1: in case of refnet joints only
Refnet joint
1~8
VRV DX indoor units
a
b
c
d
e
f
i
k
j
g
h
A
B
1
2
3
4
5
6
7 8
H1
H2
18‒2 Example 2: in case of refnet joints and header
Refnet joint
Refnet header
1~8
VRV DX indoor units
a
c
b
d
e
f
i
g
h
1
2
3
4
5
6
7
8
H1
H2
18‒3 Example 3: in case of refnet header only
Refnet header
Содержание VRV 5-S Series
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