For example your furnace - RGDA = Rheem GDA. Find the model number. The model number is used by the manufacturer (Rheem) to determine the size in tonnage of the unit. It will have a number divisible by 6 or 12, and represents the nominal BTU of the system in thousands. There are 12,000 Btus per ton of cooling, and air conditioners are sized by every ½ ton. The possibilities on residential units range from 18 to 60. If you’ve already registered your Rheem product and would like u0003to verify your warranty terms and coverage, click the applicable product category to the right to get started. I have a York AC unit model number c z b 04211 a serial number w o e 5228497 I need to know what size that unit is: Rating: older York AC. For Rheem, you should look for the second cluster of digits of the model number. The month and year of manufacture is also indicated at the upper right of the data plate. A ton of air conditioning equals 12,000 BTU, and 60 divided by 12 equals 5, so the data plate below indicates the system is 5 tons. Now I can assist with the ac model numbers if you have any of the digits following the first 4 letters counting (-). The date of production/manufacture or age of Rheem® HVAC equipment can be determined from the serial number located on the data plate. Locating the Model/Serial Numbers Should you have a problem with your system, Rheem has developed the following guidelines to assure that your problem receives proper attention. Rheem® HVAC Age How to determine the date of production/manufacture or age of Rheem® HVAC Systems. The model number is a coded number that must be decoded by using the where. How to Locate and Read your Rheem Water Heating Serial Numbers How to Find your Serial Number: The serial number identification on all Rheem water heating product rating labels contain ten(10) digits. P = plant identifying code . The easiest place to look is on the AC unit itself. R; RN; RNG; RHNG; etc.) It will have a number divisible by 6 or 12, and represents the nominal BTU of the system in thousands. It could easily be a UGDA meaning Ruud. MM = month of manufacture. nnnn = a consecutive serial number for your individual unit. A ton of air conditioning equals 12,000 BTU, and 60 divided by 12 equals 5, so the data plate below indicates the system is 5 tons. 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. Rheem water heaters that may be sold under other brand names include. Within this string of letters and numerals, you should find an even, two-digit number. Find the letter in the middle of the serial number. Your serial number u0003is required for verification. Rheem Manufacturing ranks as the global leader in the manufacture of high-quality, sustainable, and innovative water heaters, tankless water heaters, air conditioners, furnaces, pool heaters, and HVAC systems for residential and commercial applications, and is a full member of AHRI, the Air-Conditioning, Heating, & Refrigeration Institute. Serial number styles/formats found are: →Style 1: 08 84 B10488 (Serial Number begins with a prefix between one to four letters in length – i.e.