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McGarry and Madsen's home inspection blog for buyers of
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How many tons is my Comfortmaker air conditioner or heat pump?
Monday, March 25, 2019
You can determine the size in tons of your Comfortmaker HVAC system by examining the model number on the data sticker at the side of the a/c condenser (outdoor unit). Look for two numbers at the far side of the middle of the cluster of numbers in the model number that are divisible by 6 or 12, which represent the nominal BTU of the system in thousands. A ton of air conditioning equals 12,000 BTU, and 48 divided by 12 equals 4, so the data plate below indicates the system is 4 tons.
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 a Comfortmaker system, see our blog post How can I tell the age of a Comfortmaker air conditioner or furnace from the serial number? For the age of another brand or manufacturer, go to our blog post How do I determine the age of my air conditioner?
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To learn more about heating and air conditioning systems, see these other blog posts:
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