5 Preparation
Installer and user reference guide
15
RXYSQ8~12TMY1B
VRV IV-S system air conditioner
4P404225-1B – 2016.03
Requirement
Limit
RXYSQ8
RXYSQ10
RXYSQ12
VRV DX
RA DX
VRV DX
RA DX
VRV DX
RA DX
Maximum height difference
outdoor-indoor
Outdoor higher than indoor
▪ Examples: H1≤Limit
50 m
30 m
50 m
30 m
50 m
30 m
Outdoor lower than indoor
40 m
40 m
40 m
Maximum height difference indoor-indoor
▪ Examples: H2≤Limit
15 m
15 m
15 m
15 m
15 m
15 m
Maximum height difference outdoor-BP
▪ Example 2: H3≤Limit
N/A
30 m
N/A
30 m
N/A
30 m
Maximum height difference BP-BP
▪ Example 2: H4≤Limit
N/A
15 m
N/A
15 m
N/A
15 m
Maximum height difference BP-indoor
▪ Example 2: H5≤Limit
N/A
5 m
N/A
5 m
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:
▪
EN/IEC 61000‑3‑12
provided that the short-circuit power S
sc
is
greater than or equal to the minimum S
sc
value at the interface
point between the user's supply and the public system.
▪ EN/IEC
61000‑3‑12
=
European/International
Technical
Standard setting the limits for harmonic currents produced by
equipment connected to public low-voltage systems with input
current >16 A and ≤75 A per phase.
▪ It is the responsibility of the installer or user of the equipment to
ensure, by consultation with the distribution network operator if
necessary, that the equipment is connected only to a supply
with a short-circuit power S
sc
greater than or equal to the
minimum S
sc
value.
Model
Minimum S
sc
value
RXYSQ8
910 kVA
RXYSQ10
564 kVA
RXYSQ12
615 kVA
5.4.2
Safety device requirements
The power supply must be protected with the required safety
devices, i.e. a main switch, a slow blow fuse on each phase and an
earth leakage protector in accordance with the applicable legislation.
Selection and sizing of the wiring should be done in accordance with
the applicable legislation based on the information mentioned in the
table below.
Model
Minimum circuit
ampacity
Recommended
fuses
RXYSQ8
18.5 A
25 A
RXYSQ10
22 A
25 A
RXYSQ12
24 A
32 A
