Richard, I pulled this off the net awhile ago and it seems to fit your situation. I do not run into that many York units here and have only used this info once ââ¬â and it was correct. York changed their serial nomenclature, so the old cheat sheets do not seem to work in decoding anything manufactured after 2005. In your case the NEW serial decoding is used and indicates a unit manufactured in 2005 First letter - specifies CITY of manufacture. W - Witchita, Kansas Second number - tells you the THIRD digit of the year of manufacture. Third letter - specifies month of manufacture. (12 Letters) A-January B-February C-March D-April Eââ¬âMay, F-June, H-July. Fourth number - specifies fourth digit of year of manufacture.
