15 Electrical installation
Installation and operation manual
32
BS4~12A14AJV1B
VRV 5 branch selector unit
4P670163-1 – 2022.02
15.2
To connect the electrical wiring
NOTICE
▪ Follow the wiring diagram (delivered with the unit,
located at the inside of the service cover).
▪ For instructions on how to connect the optional
equipment, see the installation manual delivered with
the optional equipment.
▪ Make sure the electrical wiring does NOT obstruct
proper reattachment of the service cover.
1
Remove the service cover. See
2
Strip insulation from the wires.
a
b
a
Strip wire end to this point
b
An excessive strip length may cause electrical shock or
leakage
Allowed
Not allowed
3
Connect the transmission wiring as follows:
▪ Connect the terminals F1/F2
(TO IN/D) on the control PCB
in the outdoor unit's switch box
to the terminals
F1/F2
(Outdoor unit)
on terminal block
X2M of the first BS
unit.
See also the installation manual delivered with the outdoor
unit.
▪ In case of multiple BS
units in the system that are connected
to the same transmission wiring branch line, connect the
terminals F1/F2
(BS unit)
on terminal block X2M of the first
BS
unit to the terminals F1/F2
(Outdoor unit)
on terminal
block X2M on the second BS
unit. Repeat the same
procedure for further BS units, where each time the
terminals F1/F2
(BS unit)
on terminal block X2M on the n
th
BS unit are connected to the terminals F1/F2
(Outdoor unit)
on terminal block
X2M on the (n+1)
th
BS
unit.
▪ Connect the terminals F1/F2
(Indoor unit X)
on terminal
blocks X3M~X5M to the corresponding indoor units:
In case of…
connect…
one indoor unit where branch
pipes are NOT joined
the terminals F1/F2
(Indoor unit X)
on the BS
unit to the F1/F2
terminals on the corresponding
indoor unit
multiple indoor units
connected to the same branch
the terminals F1/F2
(Indoor unit X)
on the BS
unit to the F1/F2
terminals on the first indoor unit.
Connect the F1/F2 terminals on the
first indoor unit to the F1/F2
terminals on the second indoor unit,
and so on.
joined branch pipes
one of the two terminals F1/F2
(Indoor unit X)
of the branches
that are joined on the BS unit to the
F1/F2 terminals on the
corresponding indoor unit.
Example
INDOOR
UNIT
A
a
c
b
B1
d
INDOOR
UNIT
B
INDOOR
UNIT
C
INDOOR
UNIT
D
OUT-
DOOR
UNIT
BS
UNIT
F1 F2 F1 F2 F1 F2 F1 F2
F1 F2 F1 F2
TO
IN/D
TO
OUT/D
F1 F2 F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
F1 F2
INDOOR
UNIT
A
INDOOR
UNIT
B
INDOOR
UNIT
C
INDOOR
UNIT
D
OUT-
DOOR
UNIT
BS
UNIT
F1 F2 F1 F2 F1 F2 F1 F2
F1 F2 F1 F2
A1
B2
C
A2
a
BS unit 1
b
BS unit 2
c
Outdoor unit
d
When joining branch pipes C and D
A1/A2
Indoor unit A connected to the branch pipe A of BS
unit 1
and BS
unit 2 respectively
B1/B2
Indoor units B1 and B2 connected to the same branch
pipe B of BS unit 1
C
Indoor unit C connected to joint branch pipes C and D of
BS
unit 1. The F1/F2 terminals of the indoor unit only
have to be connected to one of the two F1/F2 terminals
inside BS
unit 1
The DIP switches of each control PCB in the BS
unit switch box
have to be set accordingly to the transmission wiring. See
4
Connect the power supply as follows. The earth wire needs to
be attached to the cup washer:
1~ 50 Hz
220-240 V
X1M
a
b
c
a
Earth leakage circuit breaker
b
Fuse
c
Power supply cable
5
Fix the cables (power supply and transmission cables) with a
tie-wrap to the foreseen fixation points. Route the wiring
according to the illustration below.
c
c
c
a
b
c
c
c
b
b
b
c
c
c
BS4~12A
X1M
X3M
BS6-8A : X3M
BS10-12A : X4M
BS4A : X3M
BS6-8A : X4M
BS10-12A : X5M
X2M
BS10~12A
BS6~12A
BS4~12A
a
Power supply cable (field supply)
b
Transmission cable (field supply)
c
Tie-wrap (accessory)
