Hi,
I don't know, why there aren't any system definitions but it's easy to add them.
Open both templates, then open the style manager.
Under the pipe or duct section you will find the system definitions.
Now you copy with drag and drop all the needed defintions to the empty template.
Save it and ready.
Joeycool
I don't know why the Global template still has any system definitions in it. I believe that they were meant to be removed from all of the templates. The reasoning is two fold.
1. There are lots of system definitions that we provide and it would be just our best guess as to which ones everyone needs which will most likely be wrong since people work on different types of systems.
2. The definintions changed from 2013 to 2014 so you can choose to use the old ones or the new ones. Mostly the changes were with layer names.
The drawing(s) that you should pull the system defintions from are here:
C:\ProgramData\Autodesk\MEP 2014\enu\Styles\Imperial\System Definitions (US Imperial).dwg
C:\ProgramData\Autodesk\MEP 2014\enu\Styles\Imperial\System Definitions 2013 (US Imperial).dwg
You can use the Style Manager to copy from one of these files into the template that you normally use when stating a drawing.
In 2015, you can just hit the search button next to Systems in the property palette and insert a system defintiion on the fly.
Hope that this helps