ASHRAE Guideline 36 provides uniform sequences of operation for HVAC systems that are intended to maximize the systems' energy efficiency and performance, provide control stability, and allow for real-time fault detection and diagnostics.

Standardized advanced control sequences provide benefits including reduced engineering time, reduced programming and commissioning time, reduced energy consumption, improved indoor air quality, and a common set of terms to facilitate communication between specifiers, contractors, and operators.

The 2021 edition of the guideline includes 24 addenda that address sequences of control for the following:

* Heating hot-water plants

* Chilled water plants

* Fan-coils

* Automatic and dynamic calculation of VAV box minimum airflow set points

* Miscellaneous improvements and bug fixes