Toshiba HFC R-410A manual Control wiring design

4. Indoor unit power supply (must be independent from outdoor unit power)

Model	Power supply wiring
	Wire size		Field-supplied fuse
All models of indoor units	2.0 mm² (AWG #14) Max. 20 m	3.5 mm² (AWG #12) Max. 50 m	15 A

Note: The connecting length indicated in the table represents the length from the junction box to the outdoor unit when the indoor units are connected in parallel for power, as shown in the illustration on the previous page. A voltage drop of no more than 2% is assumed. If the connecting length exceeds the length indicated in the table, select the wire thickness in accordance with local wiring standards.

CAUTIONS

(1)Keep the refrigerant piping system and the indoor-indoor/indoor-outdoor control wiring systems together.

(2)When running power wires and control wires parallel to each other, either run them through separate conduits, or maintain a suitable distance between them.

(Current capacity of power wires: 10 A or less for 300 m, 50 A or less for 500 m)

5. Control wiring design

Power supply
Single-phase	(Open)
220-240 V, 50 Hz

Earth

[Central remote controller] (option) TCB-SC642TLE (for line 64)

Interconnecting wire for control between outdoor units

Interconnecting wire for control between outdoor unit and indoor unit

Shielded wire must be connected to each outdoor unit

Shielded wire must be connected to each indoor unit

					Standard
					remote controller
Wire specification, quantity, size of interconnecting wiring and remote controller wiring
Name	Quantity	Size				Specification
		Up to 500 m	Up to 1000 m	1000 to 2000 m
Interconnecting wiring	2 cores	1.25 mm²		2.0 mm²		Shielded wire
(indoor-indoor/indoor-outdoor/outdoor-outdoor
control wiring, central control wiring)
Remote controller wiring	2 cores	0.5 to 2.0 mm²	-	-		-

(1)The interconnecting wiring and central control wiring use 2-core non-polarity interconnecting wires. Use 2-core shielded wires to prevent noise disturbance. In this case, close (connect) the end of shielded wires, and perform the functional grounding for the end of the shielded wires which are connected to both indoor and outdoor units. For the shielded wires which are connected between the central remote controller and the outdoor unit, perform the functional grounding at only one end of the central control wiring.

(2)Use 2-core non-polarity wire for remote controller (A, B terminals).

Use 2-core non-polarity wire for wiring of group control (A, B terminals).

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