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Electrical connection

WARNING

•

Use the specified wires for wiring connection to the terminals. Securely fix them to prevent external forces
applied to the terminals from affecting the terminals.

Incomplete connection or fixation may cause a fire or other trouble.

•

Connect earth wire. (grounding work)

Incomplete earthing cause an electric shock.
Do not connect earth wires to gas pipes, water pipes, lightning conductor or telephone earth wires.

•

Appliance shall be installed in accordance with national wiring regulations.

Capacity shortage of power circuit or incomplete installation may cause an electric shock or a fire.

CAUTION

•

The wire size and wire length of the communication line differs depending on the outdoor unit series to be
connected.

• If incorrect / incomplete wiring is carried out, it will cause an electrical fire or smoke.
• Install an earth leakage breaker that is not tripped by shock waves.

If an earth leakage breaker is not installed, an electric shock may be caused.

• Use the cord clamps attached to the product.
• Do not damage or scratch the conductive core and inner insulator of power and control wires when peeling them.
• Use the power supply wire and control wires of specified thickness, type, and protective devices required.
• Do not connect 208 V to 240 V power to the terminal blocks (Uv (U1)), (Uv (U2)), (A), (B) for control wiring.

(Otherwise, the system will fail.)

• Perform the electric wiring so that it does not come to contact with the high-temperature part of the pipe.

The coating may melt resulting in an accident.

REQUIREMENT

• For power supply wiring, strictly conform to the Local Regulation in each country.
• For wiring of power supply of the outdoor units, follow the Installation Manual of each outdoor unit.
• After connecting wires to the terminal blocks, provide a trap and fix wires with the cord clamp.
• Run the refrigerant piping line and communication line in the same line.
• Do not turn on the power of the indoor unit until vacuuming of the refrigerant pipes completes.



Power supply wire and communication wires specifications

Power supply wire and communication wires are locally procured.
For the power supply specifications, follow to the table below. If capacity is little, it is dangerous because overheat
or burnout may be caused.
For specifications of the power capacity of the outdoor unit and the power supply wires, refer to the Installation
Manual attached to the outdoor unit.

Indoor unit power supply

• For the power supply of the indoor unit, prepare the exclusive power supply separated from that of the outdoor

unit.

• Arrange the power supply, circuit breaker, and main switch of the indoor unit connected to the same outdoor unit

so that they are commonly used.

• Power supply wire specification: Cable 3-core 2.5 mm²,

in conformity with Design 60245 IEC 57



Power supply

Control wiring, Central controller wiring

• 2-core with non-polarity wires are used for the Control wiring between indoor unit and outdoor unit and Central

controller wiring.

• To prevent noise trouble, use 2-core shield wire.



Communication line

TU2C-Link models (U series) can be combined with TCC-Link models (other than U series).
For details of communication type, refer to the following table.

Communication type and model names

U series outdoor unit: SMMS-u (MMY-MUP

)

Other than U series outdoor unit: SMMS-i, SMMS-e etc. (MMY-MAP

)

Power supply

220 V - 240 V, 50 Hz

208 V - 230 V, 60 Hz

Power supply switch / circuit breaker or power supply wiring / fuse rating for indoor units should be selected by

the accumulated total current values of the indoor units.

Power supply wiring

Below 50 m