ASHRAE Guideline 13 is intended to provide a designer of building automation systems (BAS) with background information,recommendations for good practice, project considerations, and detailed discussion of options with respect to the design of a BAS system.

The guideline includes online access to an example specification, available in Microsoft Word? format, whose function is to illustrate the concepts described throughout the document.

Keywords: direct digital control, DDC, DDC systems, specifying DDC, DDC HVAC control; BAS; building automation