The tonnage of an AC unit can typically be determined from the model number by looking for a number that is divisible by 12. For example, if the model number is ABC12345, and the number 36 appears in the middle of the model number (e.g., ABC36 12345), then the AC unit is likely a 3-ton unit, since 36 is divisible by 12.. The Carrier model number provides key information such as the type of product, its model, size (tonnage), voltage, and manufacturing details. By examining this number, you can determine the size of the air conditioner. In HVAC terms, the size is often measured in British Thermal Units (BTUs). One ton of air conditioning equals 12,000 BTUs.
CARRIER MODEL AND SERIAL NUMBER, HOW TO TELL DATE AND SIZE Have a few carrier units need to know age and tonnage, M# 48TFD005---511--S# 1702640092 M# 48TFE008---511--S#0402621477 M# 48TJF016---58IYA S#2602F63529 Appreciate any help or any links to a carrier site that i can use in the future to identify units. Thanks. By understanding this correlation, you can accurately determine the tonnage based on the BTU rating revealed in the model number. Example of a Carrier Model Number Decoding Process. If a Carrier model number is "ABC1234DE56", the numbers "1234" represent the tonnage.