ALEXANDRIA, Va. — The Residential Energy Services Network Inc. (RESNET) and the ACCA Educational Institute standards task team have begun an American National Standards Institute (ANSI) public review period for proposed revisions to ANSI/RESNET/ACCA/ICC 310 — 2020, Standard for Grading the Installation of HVAC Systems.

The 45-day ANSI public review period commenced on August 16, and the comment deadline is Monday, Sept. 30. The project will update the 310 standard for its second edition, a press release from ACCA said.

The standard is the product of a collaborative effort between RESNET, ACCA, and the International Code Council (ICC) that establishes the procedures, tolerances, and record-keeping practices recommended for evaluating and grading elements of an HVAC system’s design and installation. ACCA and RESNET have a memorandum of understanding to develop and maintain the standard, with RESNET being the lead organization.

Standard 310 provides a pathway to earn an improved Energy Rating Index (ERI) score when a heating and cooling system is installed in compliance with its published requirements. The standard applies to unitary HVAC systems and is composed of five tasks: A design review, a total duct-leakage test, a blower fan volumetric airflow test, a blower fan watt draw test, and a noninvasive evaluation of refrigerant charge. The tasks are designed to be completed in sequence, and the results of each task are evaluated for compliance with specified thresholds, including design tolerances and installation quality.