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9. Electrical Wiring
9.1. General Precautions on Wiring
(1) Before wiring, confirm the rated voltage of the unit as shown on its nameplate, then carry out
the wiring closely following the wiring diagram.
(2) This equipment is not provided with a power supply cord. Circuit breaker must be incorporated
in the fixed wiring in accordance with national wiring regulations. The circuit breaker must be
approved, suitable for the voltage and current ratings of equipment and have a contact
separation in all poles.
(3) To prevent possible hazards from insulation failure, the unit must be grounded.
(4) Each wiring connection must be done in accordance with the wiring system diagram. Wrong
wiring may cause the unit to misoperate or become damaged.
(5) Do not allow wiring to touch the refrigerant tubing, compressor, or any moving parts of the fan.
(6) Unauthorized changes in the internal wiring can be very dangerous. The manufacturer will
accept no responsibility for any damage or misoperation that occurs as a result of such
unauthorized changes.
(7) Regulations on wire diameters differ from locality to locality. For field wiring rules, please refer
to your LOCAL ELECTRICAL CODES before beginning.
You must ensure that installation complies with all relevant rules and regulations.
(8) To prevent malfunction of the air conditioner caused by electrical noise, care must be taken
when wiring as follows:
● The remote control wiring and the inter-unit control wiring should be wired apart from the
inter-unit power wiring.
● Use shielded wires for inter-unit control wiring （between units） and ground the shield on both
sides.
(9) If the power supply cord of this appliance is damaged, it must be replaced by a repair shop
designated by the manufacture, because special-purpose tools are required.
9.2. Recommended Wire Length and Wire Diameter for Power Supply System
Type
AHU kit controller
Control wiring
(between outdoor and indoor units)
*For "(A) Power supply of outdoor unit", refer to "INSTALLATION INSTRUCTIONS" of outdoor
unit.
(B) Power supply
2
2.5mm
Max. 150m
(C) Inter-unit
control wiring
2
0.75mm
(AWG#18)
Use shielded wiring*
Max. 1,000m
Time delay fuse or
circuit capacity
10-16 A
(D) Remote control
wiring
2
0.75 mm
(AWG#18)
Max. 500m
13
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