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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
1 2 3
U2
U4
Central control devices: Max. 10 units
Refrigerant line 1
Outdoor unit
Indoor unit
1 2 3
A B
U3 U4
1:1 model
connection interface
This product
sold separately
( )
Remote controller
Remote controller
Remote controller
1 2 3
Refrigerant line 2
1 2 3
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
1 2 3
Refrigerant line 3
1 2 3
A B
(Reference)
Setup contents of switch
SW01
Bit 1
OFF
ON
OFF
ON
Bit 1
OFF
OFF
ON
ON
Terminator
None
100
Ω
75
Ω
43
Ω
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
1 2 3
Outdoor unit
Indoor unit
1 2 3
1 2 3
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)
1 2 3
A B
U3 U4
Remote controller
1 2 3
1 2 3
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
