Furnace age

[James M. Troth]

Whirlpool furnace Aug 1971? is this right?

ser #h71936472

[Russel Ray]

Originally Posted by jtroth

Whirlpool furnace Aug 1971? is this right?

ser #h71936472

I don't think so. I believe the H is 198x, with the 7 being the last digit, so 1987.

[James M. Troth]

Thanks RR,
Do you a guide book that you look it up in? If so what is the name of it and where can I get one?

[Brian R. Sumpter]

The date code is the 3rd to last on your model number.
Example model numbers: LRS6233BW1= 1994 , SF367PEYW1= 1992 , LE6685XPW1= 1985 or 2004 , ET22PKXXW0= 1991 , EV150CXKW0 = 1982 or 2001
Letter : Year
K:1982 or 2001
L:1983 or 2002
M:1984 or 2003
P:1985 or 2005
S:1987 or 2006
T:1988 or 2007
V:1989 or 2008
W:1990 or 2009
X:1991 or 2010
Y:1992 or 2011
A:1993 or 2012
B1994 or 2013
D1995 or 2014
E1996 or 2015
F1997 or 2016
G1998 or 2017
H1999 or 2018
J2000 or 2019
I sometimes go here when all else fails.

Some use a prestonsguide (often with mixed results it seems.)

Here is a quick cheat sheet for you that you might not have:

HVAC AGE CODES IN SERIAL # INFO
Rheem & Rudd: in the middle of the serial number will be a letter "F" the following four numbers are the week and year.

Carrier, Bryant, Payne, Day & Night: Recently (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 905 672-0860 if you get stuck.

Lennox: Either the first two or second two digits are the year, it varies by era, but most of them actually have a separate sticker somewhere that has the year printed on it. Newer ones are first two equals manufacturing plant #, 2nd two are year and letter in fifth slot is month (A thru M minus I). So 5898G 07568 would be Plant # 58, Year of MFR would be 98 and month would be July.

Amana: BLACKHORSE. B=1971 or 1981. (Of course, now that they've been bought by Goodman, who knows what'll happen.)

Goodman: First two digits of the serial number are the year. Second two are the month.
Btu rating is model number..ie; GMP075-3 (75,000 bonnet input)
Compressor is same :serial # 9709088872 (yr1997 wk 09) Tonnage is model # CK361C The first two numbers after the CK (letters) divided by 12 is tons. ie: 36 div by 12= 3 tons.


YORK HVAC DATING (Unitary Products since 1984)
Note: they skip the letters I, O, Q, U, Z.
Year of make indicated by 3rd letter in the serial number.

1971 - A 1992 - A
1972 - B 1993 - B
1973 - C 1994 - C
1974 - D 1995 - D
1975 - E 1996 - E
1976 - F 1997 - F
1977 - G 1998 - G
1978 - H 1999 - H
1979 - J 2000 - J
1980 - K 2001 - K
1981 - L 2002 - L
1982 – M 2003-M
1983 – N 2004-N
1984 – P 2005- P
1985 - R
1986 - S
1987 - T
1988 - V
1989 - W
1990 - X
1991 – Y

[Russel Ray]

Originally Posted by bsumpter

The date code is the 3rd to last on your model number.
Example model numbers: LRS6233BW1= 1994 , SF367PEYW1= 1992 , LE6685XPW1= 1985 or 2004 , ET22PKXXW0= 1991 , EV150CXKW0 = 1982 or 2001

I've only found that to be true with the third to last "digit" is a letter. In this case, it is not.

Originally Posted by jtroth

Thanks RR,
Do you a guide book that you look it up in? If so what is the name of it and where can I get one?

I use a combination of Carson Dunlop's Technical Reference Guide, Preston's Guide, and ongoing research of my own.

[Brian R. Sumpter]

Originally Posted by rray

I've only found that to be true with the third to last "digit" is a letter. In this case, it is not.

Model number is my reference point here, not his serial number.

The date code is the 3rd to last on your model number.

[Russel Ray]

I see what you did.

He didn't have a model number so I totally ignored the word "model" in your post.

Sorry about that.

Might help if I read, right?

Could you give me a red box, please? Thanks.

[Brian R. Sumpter]

No red boxes for you my friend...

That is unless its tall and has a bottle of Repasado 100% Agave in it!