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McGarry and Madsen's home inspection blog for buyers of
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How many tons is my Amana air conditioner or heat pump?
Wednesday, March 20, 2019
You can determine the size in tons of your Amana HVAC system by examining the model number on the data sticker at the side of the a/c condenser (outdoor unit). There are two model number formats we know of. The first one is an older format and the first two numbers after several letters are what you are looking for.They should be divisible by 6 or 12, and represent the nominal BTU of the system in thousands. A ton of air conditioning equals 12,000 BTU, and 36 divided by 12 equals 3, so the data plate below indicates the system is 3 tons.
Amana is manufactured by Goodman and the newer format follows the Goodman style. The 7th and 8th digits are the ones you want, and the data plate below indicates that it’s a 4 ton system.
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.
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. RLA is an acronym for Rated Load Amperage, and is what the maximum amperage should be when the condenser up and running. 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. Make sure you use RLA and not LRA, Locked Rotor Amperage, which is the surge of amps necessary to overcome inertia and start the system. It averages around five times the RLA.
To determine the date of manufacture of an Amana system, see our blog post How can I tell the age of an Amana air conditioner or heat pump from the serial number? Also see Who makes Amana air conditioners, heat pump, and furnaces?
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To learn more about heating and air conditioning systems, see these other blog posts:
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