On most units, the nameplate is fixed to the backside of the cabinet.
You'll find a metal nameplate attached to it containing the system's technical specs. Likewise, how can you tell the age of an air conditioner? Go to the outside cabinet of the air conditioning system. More recently date of manufacture information is found closer to the middle of the serial number. In the 1960s and early '70s this was the last four digits. In this way, how do you read carrier serial numbers?Īge: Four digits of serial number indicate date of manufacture where first two indicate the week and the third and fourth are the year. On other Lennox products the plate is mounted on the outside of unit. On residential gas and oil furnaces this identification plate is located on the inside of cabinet near the vestibule panel. The model is identified by a " model number" which is stamped on the unit nameplate or rating plate.
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