Dayton®

How to determine the date of production/manufacture or age of Dayton® HVAC Systems.

The date of production/manufacture or age of Dayton® HVAC equipment can be determined from the serial number located on the data plate for older models and by the date code on newer models.

Parent Company:  Dayton Electric Mfg. Co.

Example serial number styles/formats found:

  • Style 1 (Date Code):    1209

  • Style 2:    L874737886

Style 1 (Date Code):   1209

Month of manufacture can be determined by using the 1st & 2nd numerical digits.
Year of manufacture can be determined by using the 3rd & 4th numerical digits.

Style 2:   L874737886

Year of manufacture can be determined using the 2nd & 3rd numerical digits.
Week of manufacture can be determined using the 4th & 5th numerical digits.

Page last updated: 7/26/2017