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Attached is the new nomenclature for your reference as well as our old serial number information. Please feel free to contact me if you have any questions.

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YORK SERIAL NUMBER INFORMATION

FROM 1960 T0 2004

Y B V M (012345) Last 6 digits = sequence numbers

Type of Item

Year Assembled M=Mfg basic unit

P=Purchased base

KO - 1960 unit LO - 1961 S= Mfg low side

MO - 1962 Item

NO - 1963 T=Purchased low

PO - 1964 side item (or accessory)

Month Assembled RO - 1965 Z=Purchased Accessory

SO - 1966 Y=Mfg Accessory

A = JANUARY TO - 1967

B = FEBRUARY VO - 1968

C = MARCH WO - 1969 only had 2 letter prefix -

D = APRIL XO - 1970 point of manufacturer &

E = MAY AO - 1971 month not included

F = JUNE BO - 1972

G = JULY CO / CM - 1973

H = AUGUST DM - 1974

K = SEPTEMBER EM - 1975

L = OCTOBER FM - 1976

M = NOVEMBER GM - 1977

N = DECEMBER HM - 1978

JM - 1979

NAKM - 1980

NALM - 1981

NAMM - 1982

NANM - 1983

NAPM - 1984

NARM - 1985

NASM - 1986

Point of Manufacturer NATM - 1987

NAVM - 1988

Y = York NAWM - 1989

M = MADISONVILLE NAXM - 1990

N = NORMAN NAYM - 1991

E = ELYRIA NAAM - 1992

D = MEDINA NABM - 1993 4 letter prefix

T = TYPHOON NACM - 1994 started in 1980

A = ADDISON NADM - 1995

B = BLACKVILLE (DUCANE) NAEM - 1996

C = CANADA NAFM - 1997

W = WICHITA NAGM - 1998

U = TUTCO NAHM - 1999

X = MONTERREY, MX NAJM - 2000

NAKM – 2001

NALM – 2002

NAMM - 2003

NANM – 2004

mb/04

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