How can I find out how old my Rheem furnace is? The remaining characters (sequence) can be any combination of letters or numbers usually starting with a single digit representing day of the fiscal week. The next two digits represent week of manufacture. The first letter represents year of manufacturer (see chart below). How do you read a Trane furnace serial number? You can find the model and serial numbers (M/N and S/N) for your furnace by removing the top-front service panel and looking to the left side of the interior cabinet or the top of the blower deck, depending on whether your system is an 80% or 90% AFUE unit. A ton of air conditioning equals 12,000 BTU, and 60 divided by 12 equals 5, so the data plate below indicates the system is 5 tons. It will have a number divisible by 6 or 12, and represents the nominal BTU of the system in thousands. How do I decode a Rheem model number?įor Rheem, you should look for the second cluster of digits of the model number. Call the manufacturer to get the age of the furnace. This can often give a close approximation of the unit’s age. This is usually common on gas furnaces and may list the date that the furnace was installed. Look for a sticker or tag that gives a date when the furnace was last serviced. How can I find out the age of my furnace?
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