When ordering a replacement part, be sure to read all notes and symbol notations on the parts list. In some cases, it is necessary to determine the unit style number and/or serial number in addition to the model number before selecting a replacement part. When ordering painted cabinet parts, the order must specify unit model number. Hello, The Rheem/Ruud units often leave the first digit off because it has not been designated which to market as.a Rheem or a Ruud. For example your furnace - RGDA = Rheem GDA. It could easily be a UGDA meaning Ruud. Now I can assist with the ac model numbers if you have any of the digits following the first 4 letters counting (-).

• The first 2 numbers represent the factory where they were manufactured, the second 2 numbers are the year and the letter is the month where A is January, B is February, etc. An example would be 5800A12345. 58 is the factory, 00 represents the year 2000 and A means it was manufactured in January.
• 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.

Determining water heater age date from serial numbers by Final Analysis Home Inspections in Virginia beach, Chesapeake, Suffolk, and Portsmouth Virginia, Va..

What Are Rheem AC Model Numbers For? Rheem air conditioning model and serial numbers are used to determine the age of the unit as well as where it was made. This information is used for insurance issues, when signing up for service contracts and for finding replacement parts. SERIAL NUMBER NOMENCLATURE Prior to 1980 April 1, 1980 to June 1,1980 June 1, 1980 to Current 123456 A D 123 D A 123456 123 H 02 Compressor Part Number 123= 8000- 123 Date Code Unit Identity1962=B Number MONTH JAN = A FEB = B MAR= C APR = D 1972=M.

Related article: Also see 'How big should your water heater be' at our Home Inspection news blog.

As home inspectors it's important to be able to decipher the age from the water heater manufacturers serial numbers so we can report aging conditions and tell you when you can expect to replace them because a water heaters service life is approximately 13-18 years.

All water heaters have a Rating Plate that lists important data such as the model and serial numbers, manufacturing company's name, length of warranty, wattage of elements installed (on electric models), gallon capacity, input BTU rating (gas models), and more.

You can determine the age of the water heater by de-coding the serial number. Some manufacturers make it easy by incorporating the month and year built into the first 4 digits of the serial number. For instance, the picture below shows that this Rheem water heater was manufactured in December of 1991 (1291). Other manufacturers use different formats, but in a similar fashion.

Let's decode the above rating plate: This is a model 21V50-2, serial number 1291A39968, manufactured in December of 1991, 50 gallons, 36000 BTU's per hour, and it set to work with Natural Gas only. The other info you see relates more to Service Technicians, and shouldn't be needed by the average homeowner.

The picture below shows the entire Rheem Rating plate. This 50 gallon electric tank was built in August of 1984, and came equipped with 4000 watt elements

AO SMITH rating plates look a little different, but have all the same info. Their date de-coding is a little different.

AO SMITH puts the year first (1991), and the month second (07, or JULY). It's a little harder to find the info on the AO SMITH plate, but it's all there!

How To Read Ruud Furnace Model Numbers

American water heater rating plate, with close up below.

American's format puts the year first, then the week the tank was built. In this example, the tank was made in the 17th week of 1998.

The Bradford White rating plate is the most difficult to decode. To find the age of a Bradford White tank, you have to understand their coding. The year of manufacture is noted by the first letter of the serial number, the month is the second letter. The decoding is based on the following format:
Year Decoder: G = 1990; H = 1991; J = 1992; K = 1993; L= 1994; M= 1995; N= 1996; P= 1997; S= 1998; T= 1999; W= 2000; X= 2001; Y= 2002; Z=2003; A= 2004; B=2005; C=2006; D=2007
Month Decoder: A= JAN; B=FEB; C=MAR; D= APR; E=MAY; F= JUNE; G=JULY; H= AUG; J= SEPT; K=OCT; L= NOV; M= DEC.

The example rating plates is on a tank made in June 2002.

Below is a close up of the Bradford White rating plate. This is a 40 gallon electric water heater, model number MI40L6DS13, manufactured in June of 2002. It comes equipped with 4000 watt elements. Note the 'Maximum Watts' at 4000, this means this tank was built to operate in the 'Non-simultaneous' mode, meaning only one element will energize at a time (standard for residential water heaters). It is designed to operate with a maximum of 150 PSI water pressure, but was tested to 300 PSI at the factory for your safety (a Federal Standard!).

Carrier Furnace Model Numbers

Water Heater serial number chart Back to Tech Library

Back to Tech Library

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.

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.

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?

Reading Ruud Model Numbers Chart

• 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?

• 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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