I don't work on much pneumatics due to the fact there are not many buildings done with pneumtics up here. But I had a no heat with a boiler/trane air handler system at this fabricating shop in town which is all pneumatic. It was the first time I had to troubleshoot a pneumatic system, Happened to be a faulty time clock to swtich operation of three boilers. So now of course I want to get studied up on pneumatics. Just was wondering if there are any tips on where to get info. Tried google search and didn't get much useful info. Or if anyone can explain basic operation of them. I know how a pneumatic t-stat works and why the system is used. Just don't know much about them.