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4.2 Trial run
4.2.1 Precautions at the time of starting the fan
(1) Close the damper and turn the unit ON and OFF once or twice to confirm that the unit is
operating normally without any unusual noise or vibrations. At that time, check the rotation
direction of the fan through the external fan of the motor. To rotate the fan with three phase
power supply in the reverse direction, swap two of the three wires of the power supply cable.
Warning
Be sure to turn off the main power before changing the wiring of the
fan.
Failure to observe this may cause an electric shock.
(2) Turn on the power, and watch the unit closely until it reaches full speed.
At that time, carefully check for unusual noise, vibrations, current, or any other abnormal
condition.
(3) In the meantime, check that there is no defective condition, including abnormal noise,
abnormal vibration, and abnormal current.
Start the continuous operation, and gradually open the damper.
2 In order to check the condition of each part, keep the fan running at a low flow rate (light
load) for 20 to 30 minutes.
At that time, ensure that the fan does not run at a rate where surging may occur.
(4) Gradually open the damper until the fan reaches the full load operation.
Keep it running under the condition for 1 to 3 hours, and check for any vibrations and noise
at each section of the fan.
In addition, check that the motor current value is normal.
Note that the (electrical) current value of the models that handle high temperature air
becomes high during the operation using the room temperature air.
Warning
If the temperature of handling air is high, do not touch the fan main
body or ducts. Failure to observe this may cause burn on the skin.
Also set apart fro flammable gas.
4.2.2 Precautions during the operation
Warning
In the event of a power failure, be sure to turn off the main power.
Otherwise, when the power is restored, the fan suddenly starts, and it
is dangerous.
Frequently starting and stopping the fan quickly damages it. Use the following values as a
guide for the frequency of starting the fan.
Motor output Startup frequency
7.5kW or less Up to 6 times an hour
11kW to 22kW Up to 4 times an hour
26kW or more Up to 3 times an hour
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