York Serial Numbers ID FROM HISTORY TO OCTOBER 2004 X X X X 9 9 9 9 9 9 6 DIGITS SEQUENCED NUMBERS TYPE OF ITEM M=Mfg. Basic Unit P=Purchased Basic Unit A 1971 A 1992 S=Mfg. Low Side Item Month B 1972 B 1993 T=Purchased Low Side Item A Jan. C 1973 C 1994 Y=Mfg.Accessory B Feb. D 1974 D 1995 Z=Purchased Accessory Plant C Mar. E 1975 E 1996 O=Filler. Determining Air Conditioning Age & Capacity As a rule-of-thumb, capacity information is encoded by air conditioning manufactures in the model number and date of manufacture info in the serial number. There are 12,000 Btus per ton of cooling, and air conditioners are sized by every ½ ton.
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