If you divide the RLA by 6 for older units and 5 or 6 for newer units, you should get a number that approximates (not exactly) the tonnage of the system. RLA is an acronym for Rated Load Amperage, and is what the maximum amperage should be when the condenser up and running. 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. The data plate below is from a package heat pump that is nominally 3 tons, but rated at 37,000 BTU. Unfortunately, Rheem sometimes varies from the standard that the BTU rating exactly divisible by 6 or 12. 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. 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. Look for the second cluster of digits of the model number. You can determine the size in tons of your Rheem HVAC system by examining the model number on the data sti at the side of the a/c condenser (outdoor unit).
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