I’m usually very good at figuring out this sort of thing, but this old Sears condenser unit has me stumped. The model and serial #s were poorly stamped on the data plate, and not easy to read, too. As best I can tell, they are:
Model: 769 81102
Serial #: 2805 186868
The tonnage is not obvious from the model #, and it obviously was not manufactured on 2005. My best guess is 1968 (from the 2nd group of #s in the S/N and the appearance of the unit). The furnace in the house was manufactured in 1984.
Since the serial number begins with four digits, I believe that unit was manufactured prior to 1976. Consequently, ignore the first digit (2), and the second digit is the 8 of 1968, and the 05 is May.
The second set of digits ( 186868 ) is simply a consecutive manufacturer number.
