The first alpha character is for the month of production. For example, a unit that came off the line on Mawould begin with 1399, week 13 of the year 1999.ĪNNNNNN This serial number was used from 1969 to 1990. ![]() The first 4 numeric characters are the week and year of production. NNNNANNNNN This serial number format was used in the 1970's through current. ![]() The following will explain a Carrier serial number sequence. Carrier Chiller Serial Number Decoder List.How To Read Carrier Chiller Serial Number.
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