The Air Conditioning Contractors of America Educational Institute (ACCA-EI) Standards Task Team (STT) has announced an American National Standards Institute (ANSI) project notification for a proposed addendum to ANSI/ACCA Manual S - 2023, Residential Equipment Selection.  

ACCA is an ANSI-accredited standards developer that supports the American National Standards Institute (ANSI). ANSI approval of ACCA manuals, procedures, and processes verifies that the principles of openness and due process have been followed in developing these materials and that a consensus of those directly affected by the standards has been achieved.  

These standards arm contractors with procedures they need to properly select HVACR equipment, driving professionalism and excellence throughout the industry. 

The proposed Addendum “C” will correct and clarify certain requirements in the Normative Sections of ANSI/ACCA 3 Manual S - 2023, which includes Addendum “A” and “B” approved by ANSI in 2024. 

ACCA Manual S provides specific procedures for selecting HVACR equipment against a set of ACCA Manual J loads and design conditions. Manual S uses original equipment manufacturer (OEM) data and specifies how large or small the selected HVACR equipment capacity can be when compared to the load.   

The ANSI Project Initiation Notification System (PINS) will appear in the ANSI Standards Action on Friday, April 11, 2025, with a PINS response end date of Sunday, May 11, 2025. An ANSI public review draft is expected to be available for public comment following that period. 

Comments or questions can be submitted to David Bixby, ACCA’s manager of codes and standards, at david.bixby@acca.org.