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3.9. Electrical wiring

WARNING

• Wiring connections must be performed by a qualified person in accordance with

the specifications. The voltage rating for this product is 230 V at 50 Hz. It should be
operated within the range of 198 to 264 V.

• Before connecting the wires, make sure the power supply is off.
• Never touch electrical components immediately after the power supply has been

turned off. Electrical shock may occur. After turning off the power, always wait

10 minutes or more before touching electrical components.

• Use a dedicated power supply circuit. Insufficient power capacity in the electrical

circuit or improper wiring may cause electric shock or fire.

• Be sure to install an earth leakage breaker.

Otherwise, it will cause electric shock or fire.

• A circuit breaker is installed in the permanent wiring. Always use a circuit that can

trip all the poles of the wiring and has an isolation distance of at least 1/8 in (3 mm)
between the contacts of each pole.

• Use designated cables and power cables. Improper use may cause electric shock

or fire by poor connection, insufficient insulation, or over current.

• Do not modify power cable, use extension cable or branch wiring. Improper use

may cause electric shock or fire by poor connection, insufficient insulation or over

current.

• Connect the connector cable securely to the terminal. Check no mechanical force

bears on the cables connected to the terminals. Faulty installation can cause a fire.

• Use ring terminals and tighten the terminal screws to the specified torques, other

wise, abnormal overheating may be produced and possibly cause serious damage

inside the unit.

• Make sure to secure the insulation portion of the connector cable with the cable tie.

Damaged insulation can cause a short circuit.

• Fix cables so that cables do not make contact with the pipes (especially on high

pressure side). Do not make power supply cable and transmission cable come in
contact with valves (Gas).

• Never install a power factor improvement condenser. Instead of improving the power

factor, the condenser may overheat.

• Be sure to perform the grounding work.

Do not connect grounding wires to a gas pipe, water pipe, lightning rod or grounding
wire for a telephone.
•  Connection to a gas pipe may cause a fire or explosion if gas leaks.
•  Connection to a water pipe is not an effective grounding method if PVC pipe is used.
•  Connection to the grounding wire of a telephone or to a lightning rod may cause a

dangerously abnormal rise in the electrical potential if lightning strikes.

• Improper grounding work can cause electric shocks.

• Securely install the electrical box cover on the unit. An improperly installed service

panel can cause serious accidents such as electric shock or fire through exposure
to dust or water.

• Do not connect the AC power supply to the transmission line terminal board. Im

proper wiring can damage the entire system.

CAUTION

• The primary power supply capacity is for the air conditioner itself, and does not

include the concurrent use of other devices.

• If the electrical power is inadequate, contact your electric power company.
• Install a breaker in a location that is not exposed to high temperatures.

If the temperature surrounding the breaker is too high, the amperage at which the
breaker cuts out may decrease.

• When using an earth leakage breaker that has been designed solely for ground fault

protection, be sure to install a fuse-equipped switch or circuit breaker.

• This system uses an inverter, which means that it must be used an earth leakage

breaker that can handle harmonics in order to prevent malfunctioning of the earth
leakage breaker itself.

• Do not use crossover power supply wiring for the outdoor unit.
• If the temperature surrounding the breaker is too high, the amperage at which the

breaker cuts out may decrease.

• When the electrical switchboard is installed outdoors, place it under lock and key so

that it is not easily accessible.

•  Start wiring work after closing branch switch and over current breaker.
•  Connection cable between indoor unit and outdoor unit is 230 V (single-phase).
•  Be sure not to remove thermistor sensor etc. from power wiring and connection wir

ing. Compressor may fail if operated while removed.

• Do not fasten the power supply cable and connection cable together.
• Always keep to the maximum length of the connection cable. Exceeding the maxi

mum length may lead to erroneous operation.

• Do not start operation until the refrigerant is charged completely. The compressor

will fail if it is operated before the refrigerant piping charging is complete.

• The static electricity that is charged to the human body can damage the control PC

Board when handling the control PC Board for address setting, etc.

Please keep caution to the following points.

Provide the grounding of Indoor unit, Outdoor unit and Option equipment.

Cut off the power supply (breaker).

Touch the metal section (such as the unpainted control box section) of the indoor or
outdoor unit for more than 10 seconds. Discharge the static electricity in your body.

Never touch the component terminal or pattern on the PC Board.

• Be careful not to generate a spark as follows for using a flammable refrigerant.

Do not remove the fuse while power is on.

Do not disconnect plug from the wall outlet and the wiring while the power is on.

It is recommended to position the outlet connection in a high position. Place the

cords so that they do not get tangled.

• Confirm the indoor unit model name before connecting.

3.9.1. How to connect wiring to the terminal



Caution when wiring cable

• When stripping off the coating of a lead wire, always use a special tool such as a wire

stripper. If there is no special tool available, carefully strip the coating with a knife etc.