age help please

Specific Inspection Topics Inspecting HVAC Systems
1

Armstrong oil fired furnace
Model # L78B4DC12-1
SER# A 26682BNA

Thanks!

2

Steve are you sure this is the complete model number?

Model # L78B4DC12-1

Preston guide has a model number L78B84DC12 in 1992 through 1995.

Hope this helps.

3

Yes, that helps. I guess it would help to put all tne numbers in L78B84DC12-1
Thanks,
Steve McIntire

4

The last three letters of the serial number give you the date of manufacture:

B = month
N = year
A = place of manufacture

B = February
N = 1992

5

Thanks for the help