En-8
CAUTION
The primary power supply capacity is for the air conditioner itself, and does not include
the concurrent use of other devices.
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 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.
Do not connect the AC power supply to the transmission line terminal board. Improper
wiring can damage the entire system.
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.
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.
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.
Transmission cable between indoor unit and outdoor unit is 230 V.
Be sure not to remove thermistor sensor etc. from power wiring and connection wiring.
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 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.
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 crimp-type terminals with insulating sleeves as shown in the figure below to
connect to the terminal block.
(2) Securely clamp the crimp-type terminals to the wires using an appropriate tool so
that the wires do not come loose.
Sleeve
Strip : 10 mm
Crimp-type
terminal
(3) Use the specified 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
Crimp-type terminal
Terminal blocks
Screw with
special washer
Wire
Crimp-type
terminal
(6) See the table below for the terminal screw tightening torques.
Tightening torque [N·m (kgf·cm)]
M4 screw
1.2 to 1.8 (12 to 18)
M5 screw
2.0 to 3.0 (20 to 30)
5.6.1. For Pre-charge length
Piping length (L) *Pre-Charge [m]
20
5.6.2. If additional refrigerant is required
When the piping is longer than Pre-charge length, additional charging is necessary.
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For the additional amount, see the table below.
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Additional charging amount
Refrigerant pipe size
[mm (in.)]
Piping length (L)*
~20 m
30 m
40 m
50 m
g/m
Liquid
9.52 (3/8)
None
400 g
800 g
1,200 g
40 g/m
Gas
15.88 (5/8)
sd*
*
* Refer to “4.3. Refrigerant pipe size and allowable piping length”.
6. ELECTRICAL WIRING
Cable
Cable size [mm
²]
Type
Remarks
Power Supply Cable
6
Type60245 IEC66
3 Cable + Ground
1 Φ 230 V
Connection Cable
1.5
Type60245 IEC57
3 Cable + Ground
1 Φ 230 V
Max. Cable Length : Limit voltage drop to less than 2%. Increase cable if voltage drop is
2% or more.
6.1. Notes for 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 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.
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.
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 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 crimp-type terminals and tighten the terminal screws to the specified 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).
Do not connect the AC power supply to the transmission line terminal board. Improper
wiring can damage the entire system.
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.
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Connection to a water pipe is not an effective grounding method if PVC pipe is used.
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Connection to the grounding wire of a telephone or to a lightning rod may cause a
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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.
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