In the serial number, the first letter is the place of manufacturer. The first two numbers after it are the week of manufacture, and the third and fourth numbers after the letter are the year of manufacture. How can I tell the age of a Rheem air conditioner or furnace from the serial number? Find the letter in the middle of the serial number.
The first two numbers are the week that it was manufactured. Look at the first two digits after the letter. On Rheem furnace and air conditioning systems, there’s always a letter in the middle of the serial number. Where to locate a serial number on a Rheem Furnace or Air Conditioner. How do I read my Rheem package unit serial number? Look for an even, two-digit number between 18 and 60. Some manufacturers bury tonnage or BTU information in their model numbers. For example, if your air conditioner is 36,000 BTUs, you have a 3 ton unit. Simply divide the BTUs by 12,000 to calculate the tonnage of your unit. How do you tell the tonnage of a model number? 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.
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