Fan Kit; Fan Bearing And Blades; Belt; Motor - Emerson Chilled Water Series User Manual

76 Chapter 7 System Operation And Maintenance
Turn off the power before replacing the filter. You need to adjust the setting point of the filter clogging switch
if the new filter is of a different model. The filter clogging switch is located in the electric control box. It
samples the air pressures before and behind the filter through a black hose, and decides the output after
comparing the two values.
To adjust the setting point of the filter clogging switch, you should:
1. After replacing the filter, restore and seal all the panels, so that the alarm point can be found precisely.
2. Keep the fan running, and rotate the rotary switch of the filter clogging switch counter clockwise until the
filter alarm is triggered.
3. Rotate the rotary switch clockwise for 2.5 rounds, or rotate it to the point where the filter should be
replaced.
 Note
1. Set the setting point properly. Otherwise, the filter alarm may be triggered too frequently; or, in the opposite case, the dust
accumulation on the filter could not trigger the alarm, endangering the system operation due to deteriorated ventilation.
2. If you are unsure about the setting point, consult with Emerson before using a filter of a different model to replace the old one.

7.3 Fan Kit

For forward fan: The fan components that require regular checking include belt, motor bracket, fan bearing
and blades.
The fan and the installation board use integrated design. The belt tension is regulated automatically under the
force of gravity, so as to reduce the fan vibration and protect the belt. If you need more details, please contact
the manufacturer.

7.3.1 Fan Bearing And Blades

Check the fan regularly to make sure the bearing is firmly fixed. Rotate the blades and make sure that they do
not scratch the wall of the air duct. Because the bearing is permanently sealed and self-lubricated, check for
signs of wearing when adjusting the belt. Roll the belt and observe the motion of the fan bearing. If any
abnormal displacement is observed, replace the bearing.

7.3.2 Belt

Measure the belt tension with a tension meter. You can also press down the belt at the middle point between
the two pulleys. The displacement should be 0.5" ~ 1".
If the belt is found worn out or distorted, replace it with a new belt. The new belt should be of the same model
as the old one.

7.3.3 Motor

To replace the failed motor, you should be very careful, especially with the upflow unit. Use a dedicated fixture
to hold the motor before removing the fixing bolts at the bottom of the motor.
For backward EC fan：Regular check items of the fan include motor working status, fan blade status, fan
assembly fixation, and the clearance between the fan and the inlet ring.
Specially note that the fan components and the inlet ring are fixed firmly. Rotate the blades to make sure that
they do not scratch the adjacent metal plate. You should also dispose any abnormal airflow obstruction
factors in time, for protecting the refrigeration system and other system components from airflow reduction.

7.4 Infrared Humidifier

During the normal operation of the humidifier, sediment will accumulate on the water pan. To ensure efficient
operation of the humidifier, you need to clean the sediment regularly. However, the cleansing cycle varies
because the water is different in different regions. It is recommended to check, and cleanse (when necessary)
the water pan, once a month.
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