If you are unsure whether you have found the right two numbers, you can double-check it by looking for the “RLA” rating on the data plate. Here’s a rundown of the range you will encounter: 18 = 1.5 tons, 24 = 2 tons, 30 - 2.5 tons, 36 = 3 tons, 42 = 3.5 tons, 48 = 4 tons, and 60 = 5 tons. Because Sears Kenmore systems have been produced by several different manufacturers over the years, your serial number may have a different sequence. A ton of air conditioning equals 12,000 BTU, and 36 divided by 12 equals 3, so the the first one indicates the system is 3 tons. Here’s two examples of model numbers: CH50 36KVB2 and CA75 24VKA1. Just like the nominal size of lumber or an air conditioning filter, the exact cooling capacity may be a little more or less than the nominal rating, but it’s close.įor Sears Kenmore, you should look near the middle or end of the model number for a two-digit number divisible by 6 or 12, which represents the nominal BTU of the system in thousands. You can determine the “nominal” size of your HVAC system by examining the model number on the data plate at the side of the condenser (outdoor unit).
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