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Style 5: 6 Used prior to Description: Seven 7 digit all numerical serial number. Year of manufacture is the 1st digit of the serial number. Page last updated: 13 April Contact Carrier. Contact Carrier www. Inspection Notes. The first 2 are the week of the year and the second are the year. For example would mean the system was made the first week of January in Many Trane products have the date they were manufactured right on the label in the top right corner.
Style 1 starts with a letter which represents the manufacturing location and then 2 numbers which is the last 2 digits of the year manufactured in For example C12A means Clarksville Plant. Style 2 starts with numbers and the first 2 numbers are the year. Modern Lennox system serial numbers contain 4 numbers followed by a letter. The first 2 numbers represent the factory where they were manufactured, the second 2 numbers are the year and the letter is the month where A is January, B is February, etc.
An example would be A Goodman serial numbers are 10 digit numerical where the month and year are encoded in the first 4 digits. The year is the first 2 and the month the second 2. For example is manufactured is April
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