1. Rising Internal Water Temperature
The rising internal water temperature indicates the process water temperature exceeds the set limit despite the system running, which may be caused by insufficient internal circulating water volume, poor ventilation or hot air recirculation at the installation site, clogged spray nozzles or scaled heat exchange coils or incorrect fan airflow or blocked drift eliminators.
How to resolve the rising internal water temperature?
l Check and replenish internal water to the required level.
l Clear obstructions around the tower to improve airflow.
l Clean spray nozzles and remove scale from the coil surfaces.
l Inspect fan operation and clean the fill/eliminator sections.
2. Reduced Spray Water Flow
The reduced spray water flow indicates decrease in spray coverage or low pressure in the spray line, which may be caused by clogged spray nozzles or basin filters, low water level in the basin causing pump cavitation, spray pump rotating in the wrong direction (incorrect phase sequence).
How to resolve the reduced spray water flow?
l Shut down the pump and clean all nozzles and filters.
l Adjust the float valve to increase the basin water level.
l Check and correct the electrical phase sequence of the spray pump.
3. Abnormal Noise and Vibration
Abormal noise and vibration indicates unusual grinding, rattling, or excessive shaking during operation, which maybe caused by fan blades contacting the casing or foreign objects, unbalanced fan blades or loose motor mounts or bearing failure in the motor or pump.
How to resolve the abnormal noise and vibration?
l Immediately stop the unit and clear any obstructions.
l Re-balance the fan blades and tighten all mounting bolts.
l Replace worn bearings or the entire motor/pump assembly if necessary.
l Quarterly lubrication of bearings and bi-annual dynamic balancing of the fan system.