Maintaining Your Evaporative Cooling Unit: A Comprehensive Guide

Evaporative cooling units are a popular and energy-efficient choice for cooling in dry and arid climates. These units work by passing air through water-saturated pads, which cool the air through evaporation. To ensure units operate efficiently and have a long service life, regular maintenance is crucial. Our quick reference guide below will walk you through the essential preventative maintenance tasks for optimum performance.

Regular Cleaning of Air Filters

Air filters in evaporative coolers capture dust, dirt, and other airborne particles. Over time, these filters can become clogged, reducing airflow and efficiency. Check and clean the filters every 1-2 months, depending on the dust levels in your environment. Suggested cleaning method:

• Turn off the unit and unplug it.
• Remove the filters and vacuum off any loose dust.
• Wash the filters with mild soap and water if they are very dirty. Allow them to dry completely before reinstalling.

Regular Cleaning of Cooling Pads

Cooling pads are essential for the evaporative process. They should be inspected and cleaned regularly to prevent mould and mineral buildup.

• Clean the pads every 2-3 months. Remove them carefully, and rinse with water. For more thorough cleaning, use a mild detergent.
• Inspect the pads for signs of wear and replace them if they are excessively damaged or deteriorated.

Checking and Flushing the Water System

Water Distribution System: The water distribution system, including the pump and water lines, should be checked regularly to ensure it’s functioning correctly.

• Inspect the water pump for any signs of wear or malfunction. Ensure it’s clean and free of debris.
• Check the water lines for blockages or leaks.

Flushing the Water Tank: Minerals and sediments can accumulate in the water tank over time, which can affect the unit’s performance. To flush the tank:

• Turn off and unplug the unit.
• Drain the water tank completely.
• Rinse the tank with clean water to remove any deposits. For stubborn stains, use a solution of water and vinegar or a mild cleaning agent.
• Refill the tank with fresh water before restarting the unit.

Inspecting and Maintaining the Fan and Motor

Fan Blades: The fan blades are responsible for circulating the cooled air. Dust and debris can affect their efficiency.

• Turn off the unit and unplug it.
• Remove any dust or debris from the fan blades using a soft cloth or vacuum.
• Ensure the blades are securely attached and not damaged.

Motor: The motor drives the fan and water pump. It should be checked for proper operation.

• Listen for any unusual noises that might indicate a problem.
• Ensure the motor is lubricated if required (refer to the manufacturer’s instructions).
• Check for any signs of wear or overheating.

Sealing and Insulating the Unit

Proper sealing and insulation of the evaporative cooling unit are essential for maintaining efficiency.

• Inspect the unit’s seals and gaskets for wear or damage. Replace any that are deteriorated to prevent air and water leaks.
• Ensure that the unit is properly insulated to prevent energy loss, especially in colder months when the unit might be dormant.

Seasonal Preparations

Before Summer:

• Conduct a thorough inspection and cleaning of all components.
• Ensure the water tank is filled and the unit is functioning correctly before the hot weather sets in.

Before Winter:

• Drain the water tank and remove the cooling pads if you live in an area with freezing temperatures.
• Clean and store the pads and filters in a dry place.
• Cover the unit with a protective cover to keep it safe from harsh winter elements.

All of Dewick & Associates O&M manuals provide step-by-step Preventative Maintenance Log sheets for all plant and equipment within the project installation which are used on site throughout the life of the building.

Author: Louise Gardner, General Manager of Dewick & Associates