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The Lennox Model number of your unit is the most important information required in determining the correct replacement part you need.

Each individual unit has its own unique model number which is located on the data plate of the unit. Instruction manuals and service manuals which may have come with your unit do not contain the complete model number required to identify replacement parts (except when the installer actually wrote down the complete model number in them). It is essential that you get the complete model number from you HVAC unit when looking for a replacement part to ensure that you get the exact part that you need to make sure that your system is running smoothly and efficiently throughout the year.

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In a residential heating and cooling system there are generally three main components which make up the heating and cooling system: the condensing unit (outside unit), the furnace, and the evaporator coil (both are indoor and generally mounted together). Each of these components have their own unique model number.

Furnace Model Number Breakdown

Different parts of the model number mean different things. Take a G26Q3/4-100-1 for instance. It breaks down in the following way:

Series Number

This is the series number; the G meaning gas (Natural or LP).

Unit Capacity

This is the drive or air capacity of the unit. Here the 3/4 indicates a 3 to 4 ton drive. There are 400 CFM (Cubic Feet Per Minute) of airflow per ton of cooling. The capability of air movement of this example furnace is 1200 to 1600 cubic feet per minute of air. This particular unit can be matched with a 3 to 4 ton condensing unit.

BTU Rating

This is the BTU (British Thermal Unit) rating of the furnace in thousands. This furnace has a BTU input of 100,000 BTUs. The actual output of the furnace depends on its efficiency. This particular furnace is 90% efficient so its BTU output would be .90 x 100,000 or 90,000 BTUs.

Revision (Dash) Number

This is the revision number. Better known as the Dash number. This number indicates a slight revision has occurred to the model series not requiring a series change. Model series can have many revisions over the span of their life. You may see revision numbers as high as 14 or even 18. The revision number is very important in repair part identification as a -1 unit may have a different circuit board than a -8 would.

Eenie meenie sean kingston. Condensing Unit Model Number Breakdown

Different parts of the model number mean different things. Take a 10AC36-1P for instance. It breaks down in the following way:

Series Number

This is the series number. The 10 indicates this is a 10 SEER unit, the AC stands for air conditioner (as opposed to heat pump, HP).

Tonnage Capacity

This indicates the tonnage capacity of the unit. There are 12,000 BTUs in a ton of refrigeration capacity. The 36 indicates this unit has a BTU capacity of 36,000 BTUs. 36,000 divided by 12,000 equals 3 tons.

Revision (Dash) Number

This is the revision number. Better known as the dash number. This number indicates a slight revision has occurred to the model series not requiring a series change. Model series can have many revisions over the span of their life. You may see revision numbers as high as 14 or even 18. The revision number is very important in repair part identification as a -1 unit may have a different motor than a -8 would.

Phase or Voltage Requirement

The P indicates the phase or voltage the unit requires. P equals single phase 208-230 volt where a Y would equal 3 phase 208-230 volt or you may see a G which equals a 460 volt unit. Note: Rarely will a residential unit have anything other than a P for single phase.

Model numbers have varied over the years but their general breakdown is consistent for the most part. If you have any issues with finding your model number or determining what it means, don’t hesitate to contact the HVAC professionals here at HVAC Parts Shop. We’ll be more than happy to help you get the information you need and make sure you get the perfect part for your system.

HVACPartsShop.com has posted videos on YouTube to assist you in locating the model numbers:

Our Air Conditioning Model Number location video can be found by clicking here.

Our Furnace Model Number location video can be found by clicking here.

Our Evaporator Coil Model Number location video can be found by clicking here.

Air Conditioner Model Number Decoder

When your air conditioner is not working properly, you will want to know what type of air conditioner you have. Most people do not know this information, especially if it has been a while since you bought the air conditioner or had it serviced. Cousin's Air, Inc. has NATE-certified service professionals that are friendly, knowledgeable, and can help you figure out what air conditioner you have by using the model number decoder. There isn’t a universal model number decoder since AC manufacturers uses different codes but the model number can tell you the capacity, tonnage, single/variable speed, voltage, refrigerant type, and brand name. Once we know what type of air conditioner you have, our expertly trained team of technicians will be able to diagnose and fix your problem.

How Can You Decode the Model Number on Air Conditioners?

Air conditioner manufacturers usually list how to decode the model number so that you will be able to know what type of coolant or refrigerant it takes, what size air filters it needs, and how much replacement parts are. You can also use the tonnage to figure out how much energy your air conditioner uses in BTUs and kilowatt hours. Here is an example of a Trane brand air conditioner and how to use its air conditioner model decoder:

Trane Brand Air Conditioner:

Capacity:Tranehas used a number of different methods for encoding capacity information in the model number. It is commonly found in the first three digits – sometimes as BTUs and sometimes as tons.

Example:

• SPCC-B504-A = 5.0 ton, or
• TWS748A = 48,000 BTU = 4 ton

Age: For units manufactured up through the 1970’s, the date of manufacture information is found as a number and a letter in the serial number where the number is the single digit year and the letter indicates the month. A=Jan, B=Feb, C=Mar and so on. Simcity 2013 product code.

Example:

• 1C-xxxx = March 1971

If you still need assistance in decoding the model number for your air conditioner unit, trust family owned Cousin's Air, Inc. and our NATE-certified technicians to find out what you need for your air conditioner.