It is often in the last three to five digits, but is sometimes closer to the middle.Ĭoleman has used several different codes at different plants.

More recently Carrier has simplified things using the first four digits of the serial number to signify the age, where the first two digits indicate the week and the third and fourth digits indicate the year of manufacture (similar to Bryant).Ĭapacity: Rating in tons found in the fourth and fifth digits of the model numberĬapacity: Look for those elusive two digits in the model number (usually, but not always) divisible by 6 and divide by 12 to convert to tons.

Example: 3xxxxx = 1963, 4xxxxx = 1964, 5xxxxx = 1965, etc.īeginning in 1970 Carrier began to use a letter followed by a single digit year.Įxample: A1 = January 1971, B2 = February 1972, Information below refers to commonly used codes.Ĭapacity: Commonly found in the last three to five digits of model number, sometimes in 100s of Btus – sometimes in tonsĠ01 = 1.5 ton, 002 = 2 ton, 003 = 2.5 ton, 004 = 3 ton, 004-5 = 3.5 ton,ġ8xx = 1.5 ton, 24xx = 2 ton, 30xx = 2.5 ton, 36xx = 3 ton, 42xx = 3.5 ton,ġ4xx = 1 ton, 18xx = 1.5 ton, 024 = 2 ton, 030 = 2.5 ton, 036 = 3 ton,Īge: Through the 1960s Carrier used the first digit of the serial number to indicate the year of manufacture. Third & fourth digits = Year of manufacture.Ĭarrier has used several different codes at different plants. In subsequent years Bryant simplified its system where, the first two digits of serial number = Week of manufacture. To complicate matters, some manufacturers have changed their systems of encoding data over time.Ĭapacity: Look for those elusive two digits in the model number usually (but not always) divisible by 6 and divide by 12 to convert to tons.įrom 1964 through 1979 Bryant encoded age information in the serial number with the first two digits indicating week of manufacture and the letter following those first two numbers indicating the year beginning R = 1964: Some manufacturer’s systems make this easier than others. This number can be elusive, as it is not always exactly divisible by 6. Therefore it is often simple to scan the model number for a two-digit number that is divisible by 6 and to divide it by 12 to determine the capacity rating in tons. Manufacturers often encode the approximate rating in Btus somewhere in the model number. As a rule-of-thumb, capacity information is encoded by air conditioning manufactures in the model number and date of manufacture info in the serial number.There are 12,000 Btus per ton of cooling, and air conditioners are sized by every ½ ton.

First Company Air Handler Serial Number