This is probably a very long shot and a cheeky one at that!
QA Graphics do some awesome HVAC plant graphics. AHU's, Boilers, Chillers, Heat Pumps etc. To purchase their full commercial graphic package will cost you around $4,000. Does anyone have these graphics and are they willing to share or know where I could get them from? They are very good but $4,000 is a bit much.
I guess if you don't ask you'll never know!
I see your post is old, but you may be in luck for a cheaper solution.
Check out this website for graphics.
Thanks for the reply, that definitely helps.
Let me know if they are able to help with your graphical needs.
They have been good to work with for my graphical needs.