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3.7 Precautions for wiring work
Warning
Use high-quality wiring equipment and devices, and carry out wiring
work safely and securely according to the technical standards for
electrical facilities, as well as the indoor wiring regulations.
Only qualified personnel such as licensed electrical engineers are
allowed to carry out electrical wiring work.
Unqualified persons are prohibited by law from performing wiring
work and it is very dangerous.
(1) Be sure to install a ground fault interrupter and an overload protection device on the primary
power side of the fan. In case that a thermal relay is used as an overload protection device,
the fan may trip at a start-up due to its starting characteristics.
* The starting current of premium efficiency (equivalent to IE3) motor-equipped products
tends to become higher than that of standard efficiency (IE1) motor-equipped products.
It is necessary to verify the applicability of its ground fault interrupter and overload
protection device. If you have any questions, contact us.
(2) Be sure to install a ground wire to prevent an electric shock.
• Connect the ground wire to the ground terminal inside the terminal box of the fan.
• Do not connect the ground wire to gas pipes, water pipes, lightening arresters, or ground
wires for telephone.
Warning
It is prohibited by law to perform incomplete wiring work, which
exposes personnel to a great danger.
(3) Control the fluctuation of the voltage within ±10% of the rated voltage, and the frequency
within ±5% of the rated frequency.
Note that a sharp fluctuation in voltage and/or frequency may cause damage to the fan as
described in JIS C 4034-1.
(4) Before running the fan, check the following points again:
c An appropriate fuse (ground fault interrupter) is installed.
d Wiring is correct.
e The product is securely connected to a ground.
f None of the two or three terminals of the motor has come loose or is disconnected.
Caution
As for models using three-phase power supply, do not operate the
unit with only two terminals connected.
Failure to observe this may cause the motor to burn out.
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