Age of old Carrier heat pump

[Sam Morris]

Does anyone know the age of this unit?? Model # 38QH0243000SM Serial # N506851..

Click to Enlarge

94.43 KB

[Jim Katen]

1985?

[Erby]

Round was a popular thing in the 1980's.

Wonder why they went to square?

[Robert Jones]

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.

[hausdok]

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