manufacture date for water heater & a/c

Originally Posted By: mlakin
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Trying to find date of manufacture for water heaters & a/c units. Joe Tedesco mentioned a book that would tell you how to read the serial numbers for different manufactures. Ever heard of it? How do you guys tell the year if it’s not give to you?

Mike Lakin

Lakin & Assoc. Home Inspections

Originally Posted By: ecrofutt
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You need a Prestons Guide:

http://www.prestonguide.com/

Some data is:

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
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
1983 - N
1984 - P
1985 - R
1986 - S
1987 - T
1988 - V
1989 - W
1990 - X
1991 - Y

Originally Posted By: ddivito
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there is also “Technical Reference Guide” from Carson Dunlop.

It gives you the manufacturer date keys for AC, furnaces, boilers, water heaters, etc. I usually look there first. It picks up when the Preston Guide leaves you guessing.

Originally Posted By: kmcmahon
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Man…I’ve been looking for something better than Prestons. I can only find the information on about 1/2 of the units, and it doesn’t give any info on boilers.

Search the directory for a Wisconsin Home Inspector

Originally Posted By: mboyett
This post was automatically imported from our archived forum.

Appliance Age pg 1 ]

[ Image: Appliance Age pg 2 ]

Mike Boyett

Capital City Inspections

Austin, Tx

www.capcityinspections.com

Originally Posted By: mlakin
This post was automatically imported from our archived forum.

Thanks. This has all been very helpful. This MB is great!!

Mike

Mike Lakin

Lakin & Assoc. Home Inspections