Maintenance and Care of Sealed Bearings on Medium Commercial Evaporative Coolers


Note: Sealed bearings do not require greasing.

Step-by-Step Guide

  1. Regular Inspection:
    • Visual Check: Regularly inspect the sealed bearings for any signs of wear, damage, or leakage.
    • Listen for Noise: Pay attention to any unusual noises during operation, which could indicate bearing issues.
  1. Clean Surrounding Area:
    • Remove Debris: Keep the area around the bearings clean and free from dust, dirt, and debris to prevent contamination.
    • Wipe Down: Use a clean, dry cloth to wipe down the bearing housing and surrounding components.
  1. Monitor for Corrosion:
    • Check for Corrosion: Inspect the bearings for signs of corrosion caused by water exposure. Poorly maintained filter pads, inadequate bleed-off, and over-watered pads can lead to mineral and calcium deposits, causing corrosion on internal parts.
    • Preventive Measures: Ensure filter pads are well-maintained, and the unit operates with adequate bleed-off to prevent mineral buildup. Avoid over-watering pads to reduce water pull-off.
  1. Check for Proper Installation:
    • Alignment: Ensure the bearings are properly aligned and securely mounted to prevent uneven wear and premature failure.
    • Tightness: Verify that all bolts and fasteners are tight and secure.
  1. Replace When Necessary:
    • Signs of Wear: Replace the bearings if you notice any signs of wear, damage, or if they are making unusual noises.
    • Regular Monitoring: Regularly monitor bearing performance and replace them if there is a noticeable decline in efficiency or increase in operational noise.
  1. Use Protective Sprays:
    • Protective Spray Application: Apply a protective spray, such as CRC Heavy Film Soft Seal, to the sealed bearings to provide long-term protection against rust and corrosion.
    • Application Method: Ensure the bearing surface is clean and dry before applying the spray. Follow the manufacturer's instructions for application.
    • Benefits: Protective sprays create a dry, transparent film that shields the bearings from moisture and contaminants, extending their lifespan.

Common Issues and Solutions:

  1. Contamination:
    • Issue: Dirt and debris can enter the bearing housing, leading to contamination and potential bearing failure.
    • Solution: Regularly clean the area around the bearings and ensure proper sealing to prevent contamination.
  1. Corrosion:
    • Issue: Bearings can corrode due to water exposure from poorly maintained filter pads, inadequate bleed-off, and over-watered pads.
    • Solution: Inspect for signs of corrosion and maintain filter pads properly. Ensure adequate bleed-off and avoid over-watering pads.
  1. Vibration:
    • Issue: Excessive vibration can cause premature bearing wear and failure.
    • Solution: Check for proper alignment and secure mounting. Use vibration dampening techniques if needed.
  1. Misalignment:
    • Issue: Misaligned bearings can lead to uneven wear and increased friction.
    • Solution: Ensure proper alignment during installation and regularly check alignment during maintenance.
  1. Wear and Tear:
    • Issue: Bearings can wear out over time due to normal operation.
    • Solution: Regularly inspect bearings for signs of wear and replace them when required. Bearings are consumable parts and should be replaced when damage or excessive wear is identified to maintain optimal performance.

Important Notes:

  • Sealed bearings do not need greasing.
  • Regular maintenance and inspection are crucial for the longevity and performance of sealed bearings.
  • Using protective sprays can enhance the durability and protection of sealed bearings.

 

Monitoring for Corrosion

  1. Water Damage from Poorly Maintained Filter Pads:
  • Issue: Poorly maintained filter pads can cause water damage, leading to corrosion on the shaft and bearings.
  • Solution: Regularly inspect and clean filter pads. Replace them if worn or damaged to prevent water leakage.
  1. Incorrect Bleed-Off Settings:
  • Issue: Incorrect bleed-off and water management settings can cause calcium and mineral deposits on internal parts, especially the shaft and bearings.
  • Solution: Ensure bleed-off is set or water management system is operating properly to prevent excessive calcium and mineral build up.
  1. Over-Watering of Pads (Flow rate from pump to water spreaders):
  • Issue: Over-watering pads can cause water pull-off, leading to excessive moisture and corrosion.
  • Solution: Follow manufacturer guidelines for setting water flow from pump to filter pads. Monitor and adjust water flow as required to prevent water pull-off.

 

 

By following these guidelines, you can ensure the efficient and long-lasting operation of your Braemar Commercial HVAC evaporative air conditioners. Regular maintenance and timely replacement of bearings are key to preventing unexpected breakdowns and maintaining optimal performance.

 

  

For protecting sealed bearings, especially in environments prone to moisture and contaminants, here are some recommended types of protective sprays:

 

CRC Heavy Film Soft Seal:

  • Provides long-term protection against rust and corrosion.
  • Forms a dry, transparent film that shields metal surfaces.

WD-40 Specialist Long-Term Corrosion Inhibitor:

  • Offers long-lasting protection against rust and corrosion.
  • Ideal for use in high-humidity environments.

3M Rust Preventative Spray:

  • Designed to protect metal surfaces from rust and corrosion.
  • Leaves a protective coating that resists moisture.

Liqui Moly Rust Protection Wax:

  • Forms a durable, waxy film that protects against rust and corrosion.
  • Suitable for long-term storage and harsh conditions.

Boeshield T-9:

  • Developed by Boeing for long-term protection against corrosion.
  • Penetrates deeply and leaves a protective, waterproof film.


When using any protective spray, ensure the bearing surface is clean and dry before application. Follow the manufacturer's instructions for the best results.