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Coil of Duty: Reading a Carrier® Chilled Water Coil model 28NC.

Understanding coil model numbers might be part of the job, but it shouldn’t be such work. Here we de-code Carrier Chilled Water Coil model 28NC, specifically the coil-upper, which is model 28NC2022FGA207AL.

Coil Duty

This chilled water coil model is primarily seen in Carrier 39N and 39T air handlers. The model number tells you everything you need to know in order to quote the coil. With that, let’s de-code:

28NC-2-0-22-F-G-A-207-A-L

The “28NC” indicates that we are looking at a chilled water coil.

28NC-2-0-22-F-G-A-207-A-L

Next, we have a number “2” which tell us this is in the vertical position with no coating. If there were a letter present in that spot, it would mean the coil would have baked phenolic coating, which can mean a Heresite® protective coating or other types of coating.

28NC-2-0-22-F-G-A-207-A-L

This digit indicates the number of rows in this type of Carrier Chilled Water Coil, which can be 4, 6, 8 or 10 rows. The “0” indicates a 10-row coil.

28NC-2-0-22-F-G-A-207-A-L

The next two digits, “22”, tell us the number of tubes in the face of the coil, indicating the finned height of the coil.

Carrier usually uses ½” tubes for their chilled water coils. The range number can be 12 to 44, increasing by increments of two. So, for this model number, our chilled water coil has 22 tubes in the face, which tells us that the finned height of the coil is 27.5” tall. We have seen Carrier coils with 5/8” tubes, so you should always double check and measure the finned height of the chilled water coil.

28NC-2-0-22-F-G-A-207-A-L

The circuiting that Carrier offers for this type of chilled water coil is H, F or D, standing respectively for half, full or double. This model shows an “F” which is the full circuit option. To double check this, make sure your coil has all 22 tubes feeding into the supply and return header respectively.

28NC-2-0-22-F-G-A-207-A-L

The “G” tells us three important characteristics of the chilled water coil: fin material, casing material and how many fins per inch. The fin options are aluminum and copper. The casing options are galvanized and stainless steel, and the fins per inch range from 8 to 14. The “G” means copper fins at 8 fins per inch with stainless steel casing. There should always be a letter in this digit, which could be A through J, and they can all mean something different. (Don’t worry, we can help with those, too.)

28NC-2-0-22-F-G-A-207-A-L

The next digit is an “A” that tells us the coil has .017 (.016) copper tube wall thickness. There can be standard copper wall or thicker copper wall, if necessary.

28NC-2-0-22-F-G-A-207-A-L

The next 3 digits, “207,” tell us the finned length. We are used to working with inches, but this is shown to us in centimeters, so we have to convert it — just to keep us all up on our math. The 207 centimeters would convert to 81.5 inches.

28NC-2-0-22-F-G-A-207-A-L

The “A” means steel MPT connection, but you still need to measure it to confirm the size.

28NC-2-0-22-F-G-A-207-A-L

And finally, the “L” means left-hand air flow. If it were an R, it would mean right-hand air flow.

There are literally hundreds of different combinations that make up a Carrier Chilled Water coils. Have a question or need to decode a coil model number? Let the professionals at Nationwide Coils make your job easier.

Stay tuned for our next analysis of a more common Carrier Chilled Water Coil model number: 28CW1620DA1112---K.

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