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6. ELECTRICAL WIRING
6.1. The precautions of electrical wiring
Wiring connections must be performed by a qualified person in accordance with speci-
fications.
The rated supply of this product is 50 Hz, 400 V of 3-phase, 4-wire. Use a voltage within
the range of 342 to 456 V.
Make sure to perform earthing (grounding) work. Improper earthing (grounding) work
can cause electric shocks.
Before connecting the cables, make sure the power supply is OFF.
Be sure to install an earth (ground) leakage breaker. Otherwise, it will cause electric
shock or fire.
Be sure to install a breaker of the specified capacity. When selecting breaker, please
comply with the laws and the regulations of each country. One breaker must be installed
on the power supply of the outdoor unit. Wrong selection and setup of the breaker will
cause electric shock or fire.
Do not connect AC power supply to the transmission line terminal board.
Improper wiring can damage the entire system.
Connect the connector cord securely to the terminal.
Faulty installation can cause a fire.
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.
Make sure to secure the insulation portion of the connector cable with the cord clamp. A
damaged insulation can cause a short circuit.
Never install a power factor improvement condenser. Instead of improving the power factor,
the condenser may overheat.
Before servicing the unit, turn the power supply switch OFF. Then, do not touch electric
parts for 10 minutes due to the risk of electric shock.
Always use a separate power supply line protected by a circuit breaker operating on all
cables with a distance between contact of 3 mm for this unit.
Use Ring terminals and tighten the terminal screws to the specified torques, otherwise,
abnormal overheating may be produced and possibly cause serious damage inside the
unit.
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.
If the supply cable is damaged, it must be replaced by the manufacturer, its service
agent or similarly qualified persons in order to avoid a hazard.
The primary power supply capacity is for the air conditioner itself, and does not include the
concurrent use of other devices.
Connect the power cables in positive phase sequence. If they are connected in negative
phase sequence, an error will be displayed. If there is a missing phase connection, the
unit will not operate normally. Do not connect a N phase (neutral phase) cable to other
phases (misconnection). Wrong wiring will lead to parts damage.
Do not use crossover power supply wiring for the outdoor unit.
If the electrical power is inadequate, contact your electric power company.
Install a breaker (Included with earth leakage circuit 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.
Use a breaker (Included with earth leakage circuit breaker) that is capable of handling
high frequencies. Because the outdoor unit is inverter controlled, a high-frequency
breaker is necessary to prevent a malfunction of the breaker itself.
When the electrical switchboard is installed outdoors, place it under lock and key so that
it is not easily accessible.
Never bundle the power supply cable and transmission cable, remote control cable
together. Separate these cables by 50 mm or more. Bundling these cables together will
cause miss operation or breakdown.
Always keep to the maximum length of the transmission cable. Exceeding the maximum
length may lead to erroneous operation.
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 earthing (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.
En-11
WARNING
CAUTION
6.2. Wiring method
6.2.1 Connection diagrams
The wiring example for RB units, outdoor units and indoor units are shown in the figure.
To other refrigerant circuit
outdoor unit
Power supply
Power supply
400V 3Ø 50Hz
400V 3Ø 50Hz
Breaker
Outdoor unit 1
(Master unit)
Power supply
Power supply
Transmission
Transmission
RB unit
Power supply
Power supply
Breaker
Power supply
Power supply
230V 1Ø 50Hz
230V 1Ø 50Hz
*1
Power supply
230V 1Ø 50Hz
Transmission
Indoor unit
Power
Power
Remote
supply
supply
control
*1
*2
*1
Breaker
Breaker
Remote
controller
Power supply
(2-wire)
Power supply
230V 1Ø 50Hz
230V 1Ø 50Hz
*1: The number of power supply terminals is different depending on the indoor unit
model. For the wiring, refer to the indoor unit installation manual.
*2: Earth (Ground) the remote controller if it has an earth (ground) cable.
• There are two types of remote controller: the 2-wire type and the 3-wire type. For details,
see the relevant remote controller installation manual. (When connecting the 2-wire type
remote controller, Y3 is not used.)
Power supply
400V 3Ø 50Hz
Breaker
Breaker
Outdoor unit 2
Outdoor unit 3
(Slave unit 1)
(Slave unit 2)
Power supply
Transmission
Refrigerant piping
RB unit
Breaker
Transmission
Transmission
Indoor unit
Indoor unit
(cooling only)
Remote
Power
Power
supply
control
supply
*2
*1
Breaker
Breaker
Remote
controller
Power supply
230V 1Ø 50Hz
(2-wire)
Transmission
Transmission
Indoor unit
Indoor unit
Power
Remote
Remote
supply
control
control
*2
*2
*1
Breaker
Remote
Remote
controller
controller
Power supply
(2-wire)
(3-wire)
230V 1Ø 50Hz
Remote
control
*2
Remote
controller
(3-wire)
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