With the below info, I am going to guess 3 ton.
There are 12,000 Btus per ton of cooling, and air conditioners are sized by every ½ ton. Manufacturers often encode the approximate rating in Btus somewhere in the model number. 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. This number can be elusive, as it is not always exactly divisible by 6. Some manufacturer’s systems make this easier than others. To complicate matters, some manufacturers have changed their systems of encoding data over time.
Capacity: Last three digits of model number indicate approximate rating in 1000s of Btus
Example: 21TC030A = 2.5 ton
Age: Last three digits of serial number indicate date of manufacture, where the first digit indicates the year and the second and third indicate the week
Example: xxxxxx241 = 41st week of 1982