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4. Wiring specifications
• Use 2-core with no polar wire.
• Match the length of wire to wire length of the central
control system.
If mixed in the SMMS system, the wire length is lengthened
with all indoor/outdoor inter-unit wire length at side.
• To prevent noise trouble, use 2-core shield wire.
• Connect the shield wire by closed-end connection and apply open process (insulating process) to the last
terminal. Ground the earth wire to 1 point at indoor unit side. (In case of central controlling of digital inverter
(DI, SDI) unit setup)
Central control device
U1
U3
U2
U4
Central control device
U1
U3
123
U2
U4
Central control devices: Max. 10 units
Refrigerant line 1
Outdoor unit
Indoor unit
123
A
B
U3
U4
1:1 model
connection interface
This product
sold separately
( )
Remote controller Remote controller Remote controller
12
3
Refrigerant line 2
123
A
B
U3
U4
Indoor/outdoor inter-unit wire
(AC230V serial)
Header
unit
Follower
unit
Group operation (Max. 8 units)
Central control
system wiring
(OFF at shipment from factory)
(OFF at shipment from factory)
Line address
SW01 Bit 1
SW01 Bit 2
Remarks
1
ON
OFF
Turn SW01 Bit 1 to ON.
2
OF
OFF
As status shipped from factory
12
3
Refrigerant line 3
123
A
B
(Reference) Setup contents of switch
SW01
Bit 1
OFF
ON
OFF
ON
Bit 1
OFF
OFF
ON
ON
Terminator
None
100Ω
75Ω
43Ω
Remarks
Mixed with multi (Link wiring) at shipment from factory
Central control by digital inverter only
Spare
Spare
Remote controller wiring
Central control device
U1
U2
123
Outdoor unit
Indoor unit
12
3
123
A
B
U3 U4
Caution 1
Remote controller
Header
unit
Follower
unit
Caution 2
(Group operation)
Central control
system wiring
: 1:1 model connection interface
(This option)
123
A
B
U3 U4
Remote controller
12
3
123
A
B
U3 U4
Remote controller
CAUTION
1) Closed-end connection of shield wire (Connect all the connecting parts of each indoor unit)
2) Apply open process to the last terminal (insulating process).
3) Ground earth wire to 1 point at indoor unit side.
5. P.C. board switch (SW01) setup
When performing collective control by DI or SDI only, the setup of terminator is necessary.
• Using SW01, set up the terminator.
• Set up the terminator to only the adapter connected to the indoor unit of least line address No.
No. of wires
2
Size
Up to 1000m: twisted wire 1.25mm
2
Up to 2000m: twisted wire 2.0mm
2