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Electrical installation
Installer and user reference guide
82
BS4~12A14AJV1B
VRV 5 branch selector unit
4P695527-1 – 2022.02
Component
Unit
BS4A
BS6A
BS8A
BS10A
BS12A
Recommended field fuse
6 A
Residual current device
Must comply with applicable legislation.
(a)
MCA=Minimum circuit ampacity. Stated values are maximum values.
Transmission wiring
The transmission wiring outside the unit should be wrapped and routed together
with the field piping. See
"16.3 To finish the electrical wiring"
86] for more
information.
Transmission wiring specification and limits
(a)
Vinyl cords with 0.75 to 1.25 mm² sheath or cables (2‑core wires)
Maximum wiring length between BS unit and indoor units
1000 m
Maximum wiring length between BS unit and outdoor unit
1000 m
Maximum wiring length between BS units
1000 m
Total wiring length
2000 m
(a)
If the total transmission wiring exceeds these limits, communication errors might occur.
Up to 16 branches are possible for unit-unit cabling. No secondary branchings are
allowed after any transmission wire branching.
a
a
A
B
b
b
b
b
b
b
h
e
f
g
g
d
c
a
Outdoor unit
b
Indoor unit + BS unit
c
Main line
d
Branch line 1
e
Branch line 2
f
Branch line 3
g
No branch is allowed after branch
h
Central user interface (etc. …)
A
Outdoor/indoor transmission wiring
B
Master/slave transmission wiring
16.1.3 Guidelines when connecting the electrical wiring
Keep the following in mind: