5-2
5.2 Precautions in normal operation
(1) Frequently starting and stopping the fan may cause damage to it sooner. 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
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
poses a danger.
5.3 Precautions when stopping the operation
(1) When stopping the fan, close the damper slowly and then turn the power off.
(2) If air exceeding 200°C is used, close the damper, cool down the casing slowly and
completely while keeping the fan running for a certain period and then stop the operation.
Ensure that the fan does not run at a rate where surging may occur.
(3) If cooling water is used for the system, stop the fan and then close the cooling water valve.
(4) Be careful of gas leak at the shaft seal if the fan handles any hazardous gas.
5.4 Precautions when stopping the use
Warning
When you leave the fan unused for a long period of time, be sure to
turn off the main power.
(1) When you leave the fan unused for a long period of time, apply appropriate anti-corrosive
agent to the areas prone to rust.
(2) Fully protect the motor and other electrical devices from moisture.
(3) Remove the V-belt before storing the fan.
(4) Cover the bearing with a vinyl sheet or other material to prevent contact with outside air and
entry of dust.
(5) When you run the fan after a long time of nonuse, inspect each part, and refill the bearing
with grease or replace the grease.
(6) Drain water to prevent water from freezing and cracking the piping during the winter if the
bearing is cooled with water.
To Next Page
Loading...