Below are some links to have an idea about the building Automation software and their libraries:
https://www.beckhoff.com/english.asp?download/supplement_ba.htm?id=71004577100487
you can download the documentation to have a quick information about the libraries and the software
When you download the HVAC
library, check the Function Block and description under “Function Blocks”
Folder.
The above information/
documentation are for TwinCAT 2,similar for TwinCAT 3
For any further information don’t hesitate to contact us.