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