Toshiba RAV-SM2802DT-E service manual Wiring specifications, 5. P.C. board switch SW01 setup, 63

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.

No. of wires Size

2Up to 1000m: twisted wire 1.25mm2

Up to 2000m: twisted wire 2.0mm2

•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)

CAUTION

Central control device U1 U2

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.

Caution 2

Outdoor unit

1 2 3

Caution 1

1 2 3

Central control system wiring

1 2 3

Indoor unit

U3 U4 1 2 3

A B

Remote controller

		Header					Follower
		unit					unit
U3	U4		1	2	3	U3	U4	1	2	3

A B A B

Remote controller Remote controller

(Group operation)

: 1:1 model connection interface (This option)

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.

Central control device

U1	U2
U3	U4

Central control device

U1	U2
U3	U4

Central control devices: Max. 10 units

Refrigerant line 1

Outdoor unit

1 2 3

Indoor unit	U3 U4	1		2	3
			A B

1:1 model connection interface ( This product ) sold separately

Remote controller

Refrigerant line 2

Central control	1	2	3
system wiring
			Header
			unit
U3 U4	1	2	3

A B

Remote controller

Refrigerant line 3

1 2 3

Indoor/outdoor inter-unit wire (AC230V serial)

Follower unit

1 2 3

A B

Remote controller wiring

Remote controller

					Group operation (Max. 8 units)
Line address		1			2
SW01 Bit 1		ON			OF	(OFF at shipment from factory)
SW01 Bit 2		OFF			OFF	(OFF at shipment from factory)
Remarks	Turn SW01 Bit 1 to ON.			As status shipped from factory
(Reference) Setup contents of switch
SW01			Terminator			Remarks
Bit 1	Bit 1
OFF	OFF		None		Mixed with multi (Link wiring) at shipment from factory
ON	OFF		100Ω		Central control by digital inverter only
OFF	ON		75Ω		Spare
ON	ON		43Ω		Spare

– 63 –