HVAC Manufacture dates

I’m bringing this over here for future reference…


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

**BARD **1962 to March 1980
Sample Number 123456 A D

1st six digits are the Unit Identity Number. In this example they are represented by the numbers 123456.

7th digit is the month of Manufacture. (The letter A in the Sample represents January).
A = January
B = February
C = March
D = April
E = May
F = June
G = July
H = August
Letter “I” was not used.
J = September
K = October
L = November
M = December

8th digit is the year of Manufacture. (The letter D in the Sample represents 1964).
1962 = B
1963 = C
1964 = D
1965 = E
1966 = F
1967 = G
1968 = H
Letter “I” was not used.
1969 = J
1970 = K
1971 = L
1972 = M
1973 = N
1974 = O
1975 = P
Letter “Q” was not used.
1976 = R
1977 = S
1978 = T
1979 = U
1980 = V

**Bard **April & May 1980

Sample number 123 D A 123456

1st three digits are the Compressor Part Number.

4th digit is the month of Manufacture. In this sample D represents April.
D = April
F = May

5th digit is the year of Manufacture. In this sample A represents 1980.
1980 = A

This serial number style was only used during the months of April & May 1980.

6th thru 11th digits represent the Unit Identity Number.

**Bard **June 1980 to Current

Sample number 123 H80 1234567 02

1st three digits = Compressor Part #

4th digit = Month
A = January
B = February
C = March
D = April
“E” was not used
F = May
“G” was not used
H = June
“I” was not used
J = July
K = August
L = September
M = October
N = November
“O” was not used
P = December

5th & 6th digits = Year

80 = 1980
81 = 1981
82 = 1982
right on thru. The year 2000 started the numerical numbering from 00.
00 = 2000
01 = 2001
02 = 2002
right on thru to current date.

7th thru 13th digits = Unit Identity #

14th & 15th digits = Factory Code (01=OH; 02=GA)

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.

**Coleman: **Serial numbers prior to April 1992=1st two numbers are month, then year, then series.
After April 1992, 1st two numbers are year, then month, then series.

Comfortmaker (International Comfort) uses the first letter for the month (skipping I) and the first two digits are the year.

First Company Service Parts is one of 4 divisions of First Operations. They supply OEM equipment to all of the major HVAC manufacturers. They are located in Dallas, Tx at 214-388-5751. Harold Hammer at Tech Support (ext#5) will answer your questions.

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.

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.

Rheem & Rudd: in the middle of the serial number will be a letter “F” the following four numbers are the week and year.
The first letter of the serial number gives the year of manufacture as follows:

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.

U=82(seventh digit)
T=81(seventh digit)
O, A=80(seventh digit)

YORK (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.
Fraser, Johnston and Luxaire were purchased by York in 1980.

1971 - A
1972 - B
1973 - C
1974 - D
1975 - E
1976 - F
1977 - G
1978 - H
1979 - J
1980 - K
1981 - L
1982 – M
1983 – N
1984 – P
1985 - R
1986 - S
1987 - T
1988 - V
1989 - W
1990 - X
1991 – Y
1992 – A
1993 - B
1994 - C
1995 – D
1996 - E
1997 - F
1998 - G
1999 - H
2000 - J
2001 - K
2002 - L
2003 - M
2004 - N
2005 - P
2006 - R
2007 - S

Thanks, Dave. I was just redoing mine…this is faster.

Good job, Dave.
I thought about doing that, but thinking always gives me a headache.

It’s a good thing you’re around.

Here’s another.


It would be great if you could post your Bradford White (and any other water heater) information that you may have, in the Plumbing forum.

Thank’s for the info Dave!:smiley:

Oooops - sorry Dave, my mistake. I’ll do that.

“Technical Reference Guide”
Published by Carson Dunlop Weldon & Associates, Toronto, 2001
ISBN 1-895585-90-2

This is exactly why we need to sort through the archives, pull out all the reference materials, and publish them somewhere.


Here are a few more–


Please look on the outside jacket of the boiler for a CP Serial Number. It will have a bar code on it. Call (or email) Wiel McLain and they will tell you the date of manufacture. Phone: 219-879-6561 ask for Technical Services


Prior to 1984 there was not a date code included as part of the serial number. Starting in 1984, there was a four digit date code following the serial number that was month and year. Example – JO-12345-1084, this unit was built in October of 1984. Starting in the year 2000, same idea only it was a six digit date code following the serial number that is year and month. Example – 1234567-200105, this would have been build in May of 2001. Anything without the addition to the serial number would have been made before 1984 and would require contact with the factory.

Can anyone help me date a Frigidaire model FS3BA, serial FS3000752901 ?

July 2000

Please note Rheem & Rudd: as follows… is missing info below
Help anybody ?


Rheem or Ruud

Capacity: Look for those elusive two digits in the model number (usually, but not always) divisible by 6 and divide by 12 to convert to tons.
Example: RPGC-037JA = 3 ton

Age: Four digits of serial number indicate date of manufacture where first two indicate the week and the third and fourth are the year. In the 1960s and early ‘70s this was the last four digits. More recently date of manufacture information is found closer to the middle of the serial number.
Example: xxxx1872 = 18th week of 1972

Usually right after a letter, which is the manufacturing plant number:


Sometimes you’ll find nice spaces mixed in there:

11111 F1872 11111

Appreciate info on the YORK HVAC system. I have a Borg/Warner that has a NGPM as the 1st 4 letters of the Serial # I read this as a 1984 Unit.

                     Gary Osborn

**First Company - **The first alpha character denotes the year and the second two digits denote the month. Using the alphabet from A-Z, A = 1994, B = 1995, C = 1996, D = 1997, E = 1998, F = 1999 G = 2000, H = 2001, J = 2002, K = 2003, M = 2004, N = 2005, P = 2006, R = 2007 … (the characters I, O, and Q are skipped). An example would be C05 = 1996, May

I must live in a different dimension than the rest of you. Every bard serial number I have ever seen is in the format 12345 AB. Doesn’t match anything on this page. The one I now have is 88591 FS. Can anybody tell me the date of manufacture.



Had a four point the other day where the data plate showed 19 years old. I told them it may be nearing the end of it’s life. It looked pretty rough but they said their neighbor who was an A/C man replace all everything internal last year. I just went that as an upgrade.

June 1977