Please advice how to interpret york chiller serial number to Date of manufacturing.
The first letter of the serial number designates where it was built, the second letter is the month it was built, the third letter is the year it was built and the fourth letter is type of product.
For the month A=January, B=February, etc. Like Trane, York doesn't use the letter "I" nor do they use "J" for the month.
For the year, recent history is K=2001, L=2002, etc. The following letters weren't used in that sequence O, Q or U.