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5 Preparation
Installer and user reference guide
14
RXYSQ4~6TAY1B
VRV IV-S system air conditioner
4P482257-1 – 2017.03
Requirement
Limit
VRV DX
RA DX
Maximum length first branch kit-indoor unit
▪ Example 1.1, unit 8: b+c+d+e+f+g+p≤Limit
▪ Example 1.2, unit 6: b+h≤Limit
▪ Example 1.2, unit 8: i+k≤Limit
▪ Example 1.3, unit 8: i≤Limit
▪ Example 2, unit 18: b+m≤Limit
40 m
40 m
Maximum length outdoor-BP
▪ Example 2, BP3: a+b≤Limit
N/A
55 m
Minimum and maximum length BP-indoor
▪ Example 2, unit 18: Min.≤m≤Max.
Indoor unit capacity index<60
N/A
2~15 m
Indoor unit capacity index=60
N/A
2~12 m
Indoor unit capacity index=71
N/A
2~8 m
Maximum height difference outdoor-indoor
Outdoor higher than indoor
▪ Examples: H1≤Limit
50 m
30 m
Outdoor lower than indoor
40 m
Maximum height difference indoor-indoor
▪ Examples: H2≤Limit
15 m
15 m
Maximum height difference outdoor-BP
▪ Example 2: H3≤Limit
N/A
30 m
Maximum height difference BP-BP
▪ Example 2: H4≤Limit
N/A
15 m
Maximum height difference BP-indoor
▪ Example 2: H5≤Limit
N/A
5 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).
Example 1 (VRV DX indoor units)
Example 2 (RA DX indoor units)
Example 1.1
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
H3
a
c
d
f
H1
BP1
g
h
b
A
l
m
BP3
18
17
13
12
11
H4
e
i
BP2
j
k
16
15
14
H2
H5
Example 1.2
a
b
c
d
e
f
i
k
j
g
h
A
B
1
2
3
4
5
6
7 8
H1
H2
Example 1.3
a
c
b
d
e
f
i
g
h
1
2
3
4
5
6
7
8
H1
H2
Refnet joint
Refnet header
BP box
1~8
VRV DX indoor units
11~18
RA DX indoor units
5.4
Preparing electrical wiring
5.4.1
About electrical compliance
This equipment complies with: