operating instructions for the "integrated building systems" ??

You are right, this is not defined that I can find. I apply the term to the energy using systems, and how those systems integrate for operation. However, I write the Operating Instructions from the viewpoint of the users, not necessarily the facility manager. If they have a facility manager, then they would get training on how to work with the BAS and DDC systems. I try to document how they should typically interface with the building, and what things they should look out for. As for what does “integrated building systems” mean, I would use the example of a chiller. There is a unit that has a complex computer control system that integrates with the building BAS system, which both receives and sends information to the chiller. But on a daily basis, the users would not integrate much with the chiller itself. Since there is not a lot of guidance on what a Systems Manual should look like (some on what it should include), I am sure there are lots of different interpretations out there.

My interpretation of "integrated building systems" would be multiple systems working together to achieve an operational goal. For example, an air handling unit airside economizer system will allow a reduction of CHW or HW system production by controlling the air handling unit outdoor dampers, CHW/HW control valves, and CHW/HW equipment (chiller, boiler, etc.). A system manual should include operational sequences of interconnecting system and sub-components so the operator can understand the correct equipment operation. This is especially important for systems that have manual seasonal changeover operation.