Marc Posted November 10, 2015 Report Share Posted November 10, 2015 I've been seeing Carrier labels with info saying that the first 4 digits of the serial number represent the week and year of manufacturer. I've seen this going back as far as 1998. Who keeps the Chart updated? Marc Click to Enlarge 63.06 KB Link to comment Share on other sites More sharing options...
Jim Katen Posted November 10, 2015 Report Share Posted November 10, 2015 I've been seeing Carrier labels with info saying that the first 4 digits of the serial number represent the week and year of manufacturer. I've seen this going back as far as 1998. Who keeps the Chart updated? Marc Isn't that what the chart says in the first paragraph under Carrier? Link to comment Share on other sites More sharing options...
Marc Posted November 10, 2015 Author Report Share Posted November 10, 2015 Look at the last paragraph i.e. 1970 and later, a letter followed... It's back to 'First four digits of serial...'. at least since 1998. Marc Link to comment Share on other sites More sharing options...
Jim Katen Posted November 11, 2015 Report Share Posted November 11, 2015 Look at the last paragraph i.e. 1970 and later, a letter followed... It's back to 'First four digits of serial...'. at least since 1998. Marc I see. Actually, that section is missing several other iterations of Carrier serial number from older units, though they're probably getting pretty rare these days. Link to comment Share on other sites More sharing options...
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