Toshiba RAV-RM301KRTP Series Service Manual page 75

10.8.3 Wiring Specifications
Number of wires
2
• A 2-wire non-polarity cable is used.
• The cable length depends on each central control system.
• When used in a system including multiple air conditioners, the length includes the length of all wires between
indoor and outdoor units on the side of multiple air conditioners.
• Use 2-wire shield cable (MVVS) to protect from noise.
• Joint shield wire between indoor units by closed-end terminating, and leave its end open with insulation
processing. Make one-point grounding at the indoor unit side. Set the terminating resistors.
(Central control for custom indoor units only)
Central control device
U1 U2
Outdoor unit
1 2 3
Indoor unit U3 U4 1 2 3
A B
Remote controller
Size
Up to 1000 m: 1.25 mm² stranded wires
Up to 2000 m: 2.0 mm² stranded wires
Notes
1 Joint shield wire between indoor units by closed-end terminating.
2 Leave the end of the shield wire open with insulation processing.
3 Make one-point grounding at the indoor unit side.
1 2 3
Header unit Follower unit
U3 U4 1 2 3
A B
Remote controller Remote controller
(Group operation)
Central control system wiring
1 2 3 1 2 3
Follower unit
Header unit
1 2 3 1 2 3
A B A B
Remote controller
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FILE NO. SVM-18059
Specification
MVVS
: TCC-LINK adapter (option)
Required for DI-SDI indoor units
other than Wall Type
Follower unit
U3 U4 1 2 3 1 2 3
A B A B
Earth screw
(Triple operation)