TRANE
Trane uses alpha codes in their serial numbers to determine year of manufacture. They started this in 1987 with the letter B and skipped a couple of letters during the years… The first letter of the serial number gives the year of manufacture as follows:
In 2002 they started their serial numbers with the year it was built. In 2002 the first character of the serial number is 2, in 2003, 3 and so on.
Z=2001
R=2000
P=1999
N=1998
M=97
L=96
K=95
J=94
H=93
G=92
F=91
E=90
D=89
C=88
B=87
S=86
Y=85
X=84
W=83
U=82(seventh digit)
T=81(seventh digit)
O, A=80(seventh digit)