Sam Morris Posted July 21, 2012 Report Share Posted July 21, 2012 Does anyone know the age of this unit?? Model # 38QH0243000SM Serial # N506851.. Click to Enlarge 94.43 KB Quote Link to comment Share on other sites More sharing options...
Jim Katen Posted July 21, 2012 Report Share Posted July 21, 2012 1985? Quote Link to comment Share on other sites More sharing options...
Erby Posted July 21, 2012 Report Share Posted July 21, 2012 Round was a popular thing in the 1980's. Wonder why they went to square? Quote Link to comment Share on other sites More sharing options...
Robert Jones Posted July 21, 2012 Report Share Posted July 21, 2012 Preston's says 1985. It also says, 1986, 1987, 1988 and 1989. But, since 85 is in the serial number, I would go with 1985. Quote Link to comment Share on other sites More sharing options...
hausdok Posted July 21, 2012 Report Share Posted July 21, 2012 That serial number is January 1985. I'd recently found on the net copies of the applicable pages from the Carrier Policy Manual (Appendix A) that explain how to read Carrier's numbers. I've been meaning to update the TIJ furnace chart but finding the extra time lately has been really tough. Here's the link if anyone wants it: http://hvac-talk.com/vbb/attachment.php ... 1295891922 Anyway, Carrier used multiple formats - Ten Digit Alpha-Numeric; 52F Series Nine Digit Apha-Numeric; Seven Digit Alpha-Numeric; Seven, Eight and nine Digit Apha-Numeric; Eight Digit Alpha-Numeric; and Ducane manufactured furnaces used eight or nine digit alpha-numeric preceded by the number 58 and letters with the letter year and month in the last three places, and a ten digit Ducane alpha-numeric system with a six digit sequence number followed by a twi digit year and two digit month. The 7 digit system used letters indicating the month followed by single-digit year. Your's is a 7-digit serial number. They used letters A thru M (Omitting I) for 1970 to 1979 and N thru Y (Omitting O) for 1980 to 1989). So, your's is N (Jan) 5(1985) followed by the sequence number 06851. ONE TEAM - ONE FIGHT!!! Mike Quote Link to comment Share on other sites More sharing options...
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