Existing Rooftop AC?  Three criteria for VFD retrofits

HVAC equipment typically has a lifespan of twelve to fifteen years and that is why retrofit programs are so important.  VFD Retrofits improve energy efficiency, improve energy output and extend the lifespan of the existing system.

  1. Simple paybacks of less than one year.
  2. Reduce total kWh usage an average of 14% per month 
  3. Utility rebate programs can add an additional 10 percent cost reduction 

When to Retrofit RTUs with Variable Frequency Drives (VFD)

If your existing packaged rooftop air conditioning units (RTUs) meet the following criteria then a VFD Retrofit Upgrade should be considered:

  1. Existing RTUs have greater than 7 tons cooling capacity and are less than 10 years old 
  2. Existing RTUs have constant speed fan control 
  3. Existing RTUs are in good working condition with an expected additional lifetime of 5 years or more (if not consider early retirement and replacement)

The sole purpose of a VFD RTU retrofit is simple: decrease energy consumption and maintain or increase occupant comfort and environmental conditions.  

Case Study: Variable Frequency Drive (VFD) Retrofit Upgrade on RTUs

When to Retrofit with Advanced Controls:

CES looks for opportunities for increased energy efficiency with electrical and mechanical systems. If your existing RTUs meet following criteria then a VFD Retrofit Upgrade should be considered.

  • Existing RTUs have greater than 7 tons cooling capacity and are less than 10 years old 
  • Existing RTUs have constant speed fan control 

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Todd S. Morgan, P.E., President of CES

Todd S. Morgan, P.E., President

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