An American National Standards Institute (ANSI) public review period will take place for Air Conditioning Contractors of America Educational Institute’s (ACCA-EI) standard for Residential HVAC System Zoning, according to the organization. The review period will begin May 20 and will close on July 4.
This standard provides the step-by-step procedures for the design of optimum zoning in residential structures. It addresses the unique requirements of zoning design that include:
Zonal load calculations
Zoning strategies and protocols (diversity issues; multi-level construction, diverse floor plans; winter/summer room and zone CFM variations; etc.).
Zoned systems types/attributes (multiple furnaces or refrigeration cycle units, central heating-cooling with VAV dampers, split coil refrigeration cycle with multiple indoor coils).
Controls and control strategies (VAV bypass air; VAV damper sizing; multi- or variable-speed; airflow management).
Zonal duct design elements, as well as supply and return grille selection (constant volume vs. VAV)
This proposed standard is referenced as BSR/ACCA 11 Manual Zr-201x, and can be downloaded at http://www.acca.org/industry/ansi-standards/under-review. Comments must be submitted using the ACCA response form, by 11:59 EST on July 4, 2011.
