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3.10.2. Notes for electrical wiring

WARNING

• Wiring connections must be performed by a quali

ed person in accordance with the

speci

cations. The voltage rating for this product is 208/230 V at 60 Hz. It should be

operated within the range of 187 to 253 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. Insuf

cient power capacity in the electrical

circuit or improper wiring may cause electric shock or

re.

• Be sure to install an earth leakage breaker.

Otherwise, it will cause electric shock or

re.

• 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

re by poor connection, insuf

cient insulation, or over current.

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

cause electric shock or

re by poor connection, insuf

cient 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

re.

• Use ring terminals and tighten the terminal screws to the speci

ed torques,

otherwise, 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

clamp. 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

re 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

re through exposure to

dust or water.

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

Improper 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 208/230 V.
•  Be sure not to remove thermistor sensor etc. from power wiring and connection

wiring. Compressor may fail if operated while removed.

• Always keep to the maximum length of the connection cable. Exceeding the

maximum 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

ammable 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.

• Con

rm the indoor unit model name before connecting.

■

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.

(1) Use ring terminals with insulating sleeves as shown in the

gure below to connect

to the terminal block.

(2) Securely clamp the ring terminals to the wires using an appropriate tool so that the

wires do not come loose.

Sleeve

Strip : 3/8 in (10 mm)

Ring terminal

(3) Use the speci

ed wires, connect them securely, and fasten them so that there is no

stress placed on the terminals.

(4) Use an appropriate screwdriver to tighten the terminal screws. Do not use a

screwdriver that is too small, otherwise, the screw heads may be damaged and
prevent the screws from being properly tightened.

(5) Do not tighten the terminal screws too much, otherwise, the screws may break.

Wire

Screw with special washer

Ring terminal

Terminal blocks

Screw with
special washer

Wire

Ring terminal

(6) Refer to the following table for the terminal screw tightening torques.

Tightening torque [lbs·in (N·m)]

M3.5 screw

7.0 to 8.8 (0.8 to 1.0)

M4 screw

10.6 to 15.9 (1.2 to 1.8)

M5 screw

17.7 to 26.5 (2.0 to 3.0)

3.10.3. Wiring method

■

Connection diagrams

CAUTION

When connecting the power supply cable, make sure that the phase of the power
supply matches with the phase of the terminal board. If the phases do not match, the
compressor will rotate in reverse and will not be able to compress.

Indoor unit

Terminal

POWER SUPPL

Single phase, 208/230 V

Earthing
(grounding) line

Outdoor unit

Control line

(Inter Unit)

Power line

DISCONNECT

SWITCH (Locally procured)

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