Bryant gas furnace had a hard time reading the label I think the model is a DB1A or a D81A not sure the s/n number is 29T52081. thanks in advance Ron.
I don’t have my Preston’s handy to look by model but here are some other notes:
Bryant, Carrier, Day & Night, Payne….
(last 20 years or so) the first four numbers in the serial number represent the week and year. Previously, it was a complex series of letters and single digits. Call 905-672-0606 if you need help.
Or…the first two letters in serial number are the month and year.
A = Jan or 1970
B = Feb or 1971
C - Mar or 1972
D = Apr or 1973
E - May or 1974
F = Jun or 1975
G = Jul or 1976
H = Aug or 1977
I = Sep or 1978
J = Oct or 1979
K = Nov or 1980
L = Dec or 1981
M = Jan or 1982
N = Feb or 1983
P = Mar or 1984
Q = Apr or 1985
R = May or 1986
S = 1987
T = 1988
U = 1989
T = 1990
In 1945, Dresser Industries acquired Payne and Day & Night. Bryant was already a part of Dresser Industries. In 1949, Payne, Day & Night, and Bryant bought themselves out of Dresser Industries and formed Affiliated Gas Equipment (AGE). Carrier purchased AGE in 1955 and then formed the BDP Company in 1974 from Bryant, Day & Night, and Payne. United Technologies bought Carrier in 1979 and Payne separated from BDP in 1996 to form Payne Heating & Cooling but is still owned by Carrier. However, each company is it’s own company, doing its own research and manufacturing except as might be contracted with other companies. So Carrier doesn’t really “manufacture” Bryant, Payne, and Day & Night.
Larry,
Would you happen to have a similar chart for York? 
Thanks
Hi Erol, I was on the phone…
I have this:
[FONT=Arial]YORK (Unitary Products since 1984)York purchased Fraser, Johnston and Luxaire in 1980.
Year of make indicated by 3rd letter in the serial number. Note: they skip the letters I, O, Q, U, Z.
1971 - A 1975 - E 1979 - J 1983 – N 1987 - T 1991 - Y 1995 - D 1999 - H 2003 - M
1972 - B 1976 - F 1980 - K 1984 – P 1988 - V 1992 - A 1996 - E 2000 - J 2004 - N
1973 - C 1977 - G 1981 - L 1985 – R 1989 - W 1993 - B 1997 - F 2001 - K 2005 - P
1974 - D 1978 - H 1982 - M 1986 – S 1990 - X 1994 - C 1998 - G 2002 - L 2006 - R
[/FONT]
Thanks much Larry. 