![]() 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 is 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. Here’s a rundown of the range you will encounter: 12 = 1 ton, 18 = 1.5 tons, 24 = 2 tons, 30 - 2.5 tons, 36 = 3 tons. A ton of air conditioning equals 12,000 BTU, and 18 divided by 12 equals 1.5, so the data plate below indicates the system is 1-1/2 tons. It will be a two-digit number divisible by 6 or 12, and represents the nominal BTU of the system in thousands. 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 Mitsubishi, you should look near the end of the model number. 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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