Age of unit

[Buck Hartley, CMI]

Can anyone help me with the age of this Rheem AC unit, Mod. RACC-042-JAS, Serial 3936FO7919211. My Carrier Blue Book and Prestons Guide hasn't helped much. THANKS!!! In advance.

[Larry D. Kage]

Usually the four digits following the "F" in the serial number represent the week and year of manufacture.

In this case, the seventh week of 1991.

[Bill Smith]

I get 7th week of 1991.

[Buck Hartley, CMI]

Thanks! Larry & Bill

[Mark A. Timpani]

1991