En-8
(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)
6.2. Selecting circuit breaker and wiring
CAUTION
Be sure to install a breaker with speci
fi
ed capacity.
Before the electrical working, con
fi
rm electrical standards and regulations in each country,
region, or installing place. Then select appropriate cables and breakers that comply with them.
Decide the diameter of wire referring to below table “Breaker and wiring speci
fi
cations” in
accordance with local and national codes.
Breaker and wiring speci
fi
cations
Breaker
capacity
[A]
Power supply cable
Transmission cable
*
Conductor size
[mm²]
Conductor size
[mm²]
Max. length
[m]
16
2.5 (Min.)
1.5 (Min.)
75
*: If the transmission wire is longer than 50 m, use the bigger conductor size.
Max. Cable Length: Limit voltage drop to less than 2%. Increase cable gauge if voltage
•
drop is 2% or more.
Use con
fi
rmed cable with type 60245 IEC 57.
•
Install a circuit breaker with a contact gap of at least 3 mm in all poles nearby the units.
•
(Both indoor units and outdoor units)
6.3. Knock out holes for wiring
CAUTION
Be careful not to deform or scratch the panel while opening the knock out holes.
When cables are routed from the unit, a protection sleeve for the conduits can be
inserted at the knock out hole.
If you do not use a wire conduit, be sure to protect the wires to prevent the edge of the
knock out hole from cutting the wires.
It is recommended to apply anti-rust paint to the edge of the knock out hole.
Knock out holes are provided for wiring. (Fig. A)
•
Knock out holes are provided 2 each in the same size in front, lateral and rear sides.
•
(Fig. B)
Fig.
A
Fig.
B
Installation method of One-touch bush
Please
fi
x the One-touch bush (accessory) as shown in the
fi
gure below.
Front connection
Lateral connection
Rear connection
One-touch cable bush
(Accessories)
One-touch cable bush
(Accessories)
One-touch cable bush
(Accessories)
(Pipe cover rear)
(Pipe cover front)
Note : Please ensure that the power cable and interconnecting cables are not installed
through the same cable bush hole opening. They must be installed into the two
separate hole openings to prevent damage to the cable.
WARNING
Do not modify power cable, use extension cable or branch wiring. Improper use may
cause electric shock or
fi
re by poor connection, insuf
fi
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
fi
re.
Use crimp-type terminals and tighten the terminal screws to the speci
fi
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 earthing (grounding) work.
Do not connect earthing (grounding) wires to a gas pipe, water pipe, lightning rod or
earthing (grounding) wire for a telephone.
Connection to a gas pipe may cause a
fi
re or explosion if gas leaks.
•
Connection to a water pipe is not an effective earthing (grounding) method if PVC
•
pipe is used.
Connection to the earthing (grounding) wire of a telephone or to a lightning rod may
•
cause a dangerously abnormal rise in the electrical potential if lightning strikes.
Improper earthing (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
fi
re through exposure to dust or
water.
CAUTION
The primary power supply capacity is for the air conditioner itself, and does not include
the concurrent use of other devices.
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.
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.
Start wiring work after closing branch switch and over current breaker.
Use an earth leakage breaker that is capable of handling high frequencies. Because the
outdoor unit is inverter controlled, a high-frequency earth leakage breaker is necessary
to prevent a malfunction of the breaker itself.
When using an earth leakage breaker that has been designed solely for earth (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.
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
fi
gure 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 speci
fi
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
Crimp-type terminal
Terminal blocks
Screw with
special washer
Wire
Crimp-type
terminal
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