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HVAC School - For Techs, By Techs

May 30, 2024

Standard 310 is a technical workflow created by ACCA, ResNet, and ANSI for grading the installation of HVAC systems, typically in new home construction. It plays a crucial role in obtaining Energy Star certification, which can qualify homeowners for tax credits under the Inflation Reduction Act. The five steps of Standard 310 are design review, duct leakage test, total system airflow, blower fan watt draw, and refrigerant charge verification.

In this podcast episode, host Bryan Orr is joined by guests Chris Hughes and Eric Kaiser to discuss Standard 310 and its implications for HVAC contractors.

The standard aims to ensure that HVAC systems are installed correctly and operate as designed. The process involves a third-party HERS rater conducting various tests and measurements, which contractors need to be prepared for. Proper duct sealing, airflow settings, and refrigerant charging are critical for passing the assessments.

One of the challenging aspects highlighted is the refrigerant charge verification step. The standard requires either non-invasive testing (which has temperature limitations) or weigh-in verification with geotagged photos. Chris Hughes suggests manufacturers could develop more consistent commissioning protocols to streamline this process.

Topics covered in the podcast:

  • Overview of Standard 310 and its five steps
  • Importance for Energy Star certification and tax credits
  • Role of HERS raters and HVAC contractors
  • Duct leakage testing and proper sealing
  • Airflow measurement methods
  • Blower fan watt draw challenges
  • Refrigerant charge verification options
  • Need for consistent commissioning protocols
  • Coordination and documentation required
  • Future improvements to the standard


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