Dan,
I went to the source for you. I contacted my friend Rick Love from Vintage Air about your question. He said:
"I think the best thing to tell him would be to call Vintage Air’s Tech Line @ 800-862-6658. Any of the guys can help him figure out exactly which system he has (if it is one of ours), and we will be happy to help him download a complete set of installation and operational instructions. It sounds like he has an older vacuum operated system, and it should not be a problem. He is also pretty close to one of our better Dealers if he wants someone to take a look at it.
Have a nice New Year!
Rick"
Hope that helps!
