15 Electrical installation
Installation and operation manual
33
BS4~12A14AJV1B
VRV 5 branch selector unit
4P670163-1 – 2022.02
Guidelines
▪ Make sure the length of the earth wire between the fixation point
and the terminal is longer than the length of the power supply
wires between the fixation point and the terminal.
▪ Cut a slit in the rubber bushing where cables are entering the
switch box.
▪ Make sure to fix the cables on the outer cable jacket and NOT on
the wires.
▪ Do NOT strip the outer cable jacket lower than the fixation point.
MAX
▪ Leave sufficient spare cable (± 20 cm additionally) for all cables
between the fixation point inside the switch box and the fixation
point on the side of the BS unit. This spare cable is required to
lower the switch box.
a
b
c
a
Spare cable
b
Switch box in upper position
c
Switch box in lower position
6
Reattach the service cover. See
CAUTION
Be careful NOT to pinch cables between the service cover
and the switch box.
15.3
To finish the electrical wiring
After installing the transmission wires, wrap them along with the
onsite refrigerant pipes using finishing tape, as shown in the
illustration below.
d
b
e
a
d
a
c
f
a
Liquid pipe
b
Gas pipe
c
High pressure / low pressure gas pipe
d
Finishing tape
e
Transmission wiring (F1/F2)
f
Insulation
15.4
To set the DIP switches
The DIP switches are located on the PCB's A1P, A2P (BS6~12A)
and A3P (BS10-12A).
A1P
A2P
A3P
A B C D
E F G H
I J K L
A B
C D
E F
G H
I J
K L
b
a
c
ON
DS1
OFF
1 2 3 4
ON
DS2
OFF
1 2 3 4
a
Terminal for transmission wiring to indoor unit
b
Branch pipe port number
c
DIP switches
To set the DIP switches for branch pipe ports to which NO
indoor unit is connected
Setting for branch pipe ports to which NO indoor unit is
connected
(a)
DS1 (A1P)
DS1 (A2P)
DS1 (A3P)
1
2
3
4
1
2
3
4
1
2
3
4
BS4A
Unit A
Unit B
Unit C
Unit D
BS6A
Unit E
Unit F
BS8A
Unit G
Unit H
BS10A
Unit I
Unit J
BS12A
Unit K
Unit L
Target branch pipe port
(a)
ON
=NOT connected /
OFF
=connected (factory default)
Example
When connecting an indoor unit to
branch pipe ports A and B, but NOT
connecting an indoor unit to branch pipe
ports C and D.
ON
DS1 (A1P)
OFF
1 2 3 4
To set the DIP switches when joining branch pipe ports
This is required for connection with e.g. FXMA200A and FXMA250A.
Setting when joining branch pipe ports
(a)
DS2 (A1P)
DS2 (A2P)
DS2 (A3P)
1
2
1
2
1
2
BS4A
A and B ports are
joined
C and D ports are
joined
BS6A
E and F ports are
joined
BS8A
G and H ports
are joined
BS10A
I and J ports
are joined
BS12A
K and L
ports are
joined
Target branch pipe port
(a)
ON
=joined /
OFF
=NOT joined (factory default)
Note:
When joining branch pipe ports, ONLY the combinations in
above table are possible. It is NOT possible to e.g. join port B and C.
