serial # codes?

Anybody have a list of manufacteurs and how they code their serial #'s for boilers,furnaces, and a/c compressors.


Do you mean for date of manufacture?

I’m sure RR will get here soon with his list (I can’t locate it) otherwise try searching the archives for the files.

This is one posted long ago and is at least an ok starter set…

I believe this was RR’s:


Also get Prestons Guide and the Technical Reference Guide.