There are probably hundreds of thousands of sequences of controls that have been written to control everything from a simple pump or fan operating on a schedule to very complex (and often proprietary) chiller plant optimization algorithms. Among the multitude of sequences written and implemented to date, these sequences offer a broad spectrum of reliability, functionality, ease of implementation, energy efficiency, alarms/notification, etc. In the interest of gathering the best practices of firms for control of the most common types of HVAC systems, ASHRAE formed a committee to author the forthcoming Guideline 36.

From their web site:

Guideline 36 was created by ASHRAE’s Technical Committee 1.4, Control Theory and Application to maintain and publish best-of-class control sequences that meet or exceed the requirements of published ASHRAE standards such as 90.1, 62.1 and 55. These sequences are intended for use with fully programmable DDC BAS systems controlling variable speed/capacity equipment.

As of April 2016, the committee has addressed the most common types of air-side HVAC systems. Their work is published for free download as part of the public review process.