Full Description

The purpose of this guideline is to provide recommendations for developing specifications for direct digital control (DDC) systems in heating, ventilating, and air-conditioning (HVAC) control applications.

This guideline is under continuous maintenance, which is a process ASHRAE uses to keep guidelines current through the issuance of addenda, or revisions. Please make sure the guideline number and date of issue match your document.

When they are available, these addenda can be downloaded for free at the following page of the ASHRAE web site:
http://www.ashrae.org/technology/page/132

When they are available, interpretations of the standard, issued by the sponsoring technical committee, also may be downloaded for free at the following address:
http://www.ashrae.org/technology/page/121

Errata lists are issued occasionally and may be downloaded for free at the following address:
http://www.ashrae.org/technology/page/120

Units: Dual

Citation: ASHRAE Guideline