Home >Articles >Draft PDS-01 BSR/RESNET/ICC 301-2022 Addendum C-202x, Interim Updates

Draft PDS-01 BSR/RESNET/ICC 301-2022 Addendum C-202x, Interim Updates

Nov 29, 2023 General


PDS-01 BSR/RESNET/ICC 301-2022 Addendum C-202x, Interim Updates

Proposed standard BSR/RESNET/ICC 301-2022 Addendum C-202x amends the 2022 edition of Standard 301 to provide clarifications and interim updates. The proposed revisions address the following major subjects and others: clarifications to improve the consistency of rating software calculations; definitions and acronyms for terms used in the Standard; new federal HVAC appliance SEER2 and HSPF2 ratings and ceiling fan ratings; the treatment of shared water heater losses for multi-family dwelling units; balanced mechanical ventilation; duct leakage where all ducts are within conditioned space; carbon dioxide index calculations; onsite battery storage; multiple end-use loads; interior shading; reporting of the edition of standard ANSI/RESNET/ICC 301 that rating calculations are compliant with, and; interpretations issued for ANSI/RESNET/ICC 301-2022.

RESNET released a first public review draft of proposed Addendum C in January 2023 but subsequently discontinued the initial project after a second public review. Development of the Addendum was reinitiated in August with an expanded set of interim updates to Standard 301. This draft is the first public review draft for the expanded proposed addendum. All proposed amendments in this draft are open for comment and parties must submit their comments specific to this draft for them to be considered by SDC 300. Comments on drafts from the discontinued project will not be automatically carried forward.

The draft addendum, comment form, and comments received are posted at Draft PDS-01, RESNET/ICC 301-2022 Addendum C-202x, Interim Updates. Public comments will be accepted from December 15, 2023, through January 29, 2024.