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

When it comes to Carrier 39N and 39T air handlers, this chilled water coil model is quite prevalent. By decoding the model number, you'll gather all the information needed to accurately quote the coil. So, let's dive in:

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

The "28NC" signifies that we're dealing with a chilled water coil.

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

The number "2" following the initial designation indicates that this coil is designed for vertical installation and lacks any coating. Had there been a letter instead of the number, it would suggest the presence of a baked phenolic coating, such as Heresite® or another type of protective layer.

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

This zero represents the number of rows in the coil. For Carrier Chilled Water Coils, row counts typically fall between four and ten. In this case, "0" implies a ten-row configuration.

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

The consecutive two digits, "22," denote the number of tubes across the face of the coil, providing insight into its finned height. Carrier generally employs ½" diameter tubes for their chilled water coils, with the number of tubes ranging from 12 to 44 in increments of two. Therefore, this model has 22 tubes across the face, corresponding to a finned height of 27.5". It's worth noting that some Carrier coils feature 5/8" tubes, so verifying the finned height via measurement is always prudent.

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

The circuiting options offered by Carrier for this type of coil include H, F, or D, representing half, full, or double circuits, respectively. Here, the "F" signifies the full circuit option. To confirm, ensure all 22 tubes connect to both the supply and return headers.

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

The "G" provides critical details about the coil's fin material, casing material, and fins per inch. Fin materials can be aluminum or copper, casings can be galvanized or stainless steel, and fins per inch range from 8 to 14. The "G" here indicates copper fins at 8 fins per inch with a stainless steel casing. Each letter from A to J holds specific meanings, and we’re happy to assist with further clarification if needed.

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

The next character, "A," reveals that the coil features a .017 (.016) copper tube wall thickness. Standard copper walls or thicker ones can be selected based on requirements.

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

The subsequent three digits, "207," represent the finned length. While we commonly use inches, these dimensions are provided in centimeters. Converting 207 centimeters gives us 81.5 inches.

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

The "A" suggests a steel MPT connection, though physical measurement remains essential for verification.

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

Lastly, the "L" indicates left-hand airflow. An "R" would signal right-hand airflow instead.

Carrier Chilled Water Coils come in hundreds of variations. If you have questions or need assistance decoding a model number, don't hesitate to reach out to the experts at Nationwide Coils. They’ll simplify the process for you.

Keep an eye out for our next analysis, where we'll delve into the more common Carrier Chilled Water Coil model number: 28CW1620DA1112---K.

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