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How may tons is my Ruud air conditioner or heat pump?

Wednesday, March 20, 2019

You can determine the “nominal” condenser tonnage of your HVAC system by examining the model number on the data plate at the side of the condenser (outdoor unit). 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.

Ruud Air Conditioning Division 3 Model Numbers ARI Cooling Performance ARI Heating Performance (70°F 21°C Indoor) 80 °F 26.5 C DB/67 F 19.5 C WB Indoor Air 95°F 35°C DB Outdoor Air Outdoor Air 47°F 8.5°C DB/ 43°F 6°C WB DOE High Temp. 17°F –8.5°C DB/ 15°F –9.5°C WB DOE Low Temp. DOE Region IV HSPF V HSPF Outdoor. Examples of troubles reading old fuzzy or partly obscured serial numbers or model numbers on HVAC equipment are in our article just above. So if your 2 and 5 are really SS the unit could be as old as May 1959 or perhaps more likely, as recent as 1980. Send us a sharp focused photo of the entire label if you can and I'll comment further. 4 Rely on Ruud.™ Model Number Identiﬁcation RF1T/RF1P Series Model Number Identification R F 1 T 24 21 S P A N J A N 00. Option Code Blank = None Factory Heat 00 = NO HEAT 03 = 3 kW 05 = 5 kW 08 = 8 kW 10 = 10 kW Disconnect B = Breaker N = None Minor Series A = First RF1P2421STANJAN00 Voltage J = 208/240/1/60 RF1P2421STANJAB05Controls.

For Ruud, you should look for the second cluster of digits of the model number. It will be a number divisible by 6 or 12, and represents the nominal BTU of the system in thousands. A ton of air conditioning equals 12,000 BTU, and 24 divided by 12 equals 2, so the data plate below indicates the system is 2 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.

Ruud Rheem/Ruud Richmond Vista Therm Citation Aqua Therm Energy Master Vanguard Cimarrom Coast to Coast Lowe’s Servi-Star True Value ABS Intertherm & Miller. The first two positions are the year followed by a two digit week. Position 5 is a letter followed by 6 numbers. Reliance Ace Ambassador Barnett Century.

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 age of a Ruud system, go to our blog post How can I tell the age of a Ruud air conditioner or furnace from the serial numberFor 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:

• How can I find out the SEER of my air conditioner?

• My air conditioner won't turn on. What's wrong?

• How can I find out the size of my air conditioner?

• How can I find out the age of my air conditioner or furnace?

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• How can I tell whether the condenser (outdoor unit) is an air conditioner or heat pump?

• Where is the air filter for my central air conditioner and furnace? I can’t find it?

• Does an old air conditioner use more electricity as it ages?

• How did homes stay cool in Florida before air conditioning?

• What is wrong with an air conditioner when the air flow out of the vents is low?

• Why has the thermostat screen gone blank?

• Why does it take so long to cool a house when an air conditioner has been off for a while?

• Why is my air conditioner not cooling enough?

• What are the most common problems with wall/window air conditioners?

• Will closing doors reduce my heating and cooling costs?

Visit our HEATING AND AIR CONDITIONING page for other related blog posts on this subject, or go to the INDEX for a complete listing of all our articles.

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