15 Electrical installation
Installation and operation manual
35
SV1ASV4~8A14AJV1B
VRV 5 safety valve unit
4P709466-1 – 2023.09
Connection for SV1A
▪ 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
X3M
of the first SV unit.
See also the installation manual delivered with the outdoor
unit.
▪ In case of multiple SV units in the system that are connected
to the same interconnection wiring branch line, connect the
terminals F1/F2
(SV
unit)
on terminal block
X3M
of the first
SV unit to the terminals F1/F2
(Outdoor unit)
on terminal
block
X3M
on the second SV unit. Repeat the same
procedure for further SV units, where each time the
terminals F1/F2
(SV
unit)
on terminal block
X3M
on the n
th
SV unit are connected to the terminals F1/F2
(Outdoor unit)
on terminal block
X3M
on the (n+1)
th
SV unit.
4
For all SV units, continue the interconnection wiring as follows:
▪ Connect the terminals F1/F2
(Indoor unit X)
on terminal
blocks
X3M
and
X4M
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 SV 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 SV 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 SV 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
SV
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
SV
UNIT
F1 F2 F1 F2 F1 F2 F1 F2
F1 F2 F1 F2
A1
B2
C
A2
a
SV unit 1
b
SV 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 SV unit 1
and SV unit 2 respectively
B1/B2
Indoor units B1 and B2 connected to the same branch
pipe B of SV unit 1
C
Indoor unit C connected to joint branch pipes C and D of
SV unit 1. The F1/F2 terminals of the indoor unit only
have to be connected to one of the two F1/F2 terminals
inside SV unit 1.
Note:
The DIP switches of each control PCB in the SV unit switch
box have to be set accordingly to the interconnection wiring. See
"15.5 To set the DIP switches"
5
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
6
Attach the cables (power supply and interconnection cables)
with a cable tie to the provided fixation points. Route the wiring
according to the illustration below.
c
c
c
c c b
c
SV1~8A
X1M
X3M
X2M
SV6~8A
SV4~8A
c
c
SV1A
SV6~8=X4M
SV4A=X3M
X3M
a
a
Power supply cable (field supply)
b
Interconnection cable (field supply)
c
Cable tie (accessory)
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 enter the switch box.
▪ Attach the cables onto the outer cable jacket and NOT onto 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 SV unit. This spare cable is required to
lower the switch box.
Summary of Contents for VRV 5
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