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

When it comes to Carrier 39N and 39T air handlers, the model number of a chilled water coil holds all the essential information you’ll need to get the right replacement. Let’s dive into decoding the model number:

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

First up, the “28NC” identifies this as a chilled water coil manufactured by Carrier.

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

The second character, “2”, indicates that this coil is designed for a vertical installation without any special coatings. If there were a letter here, it would signify the presence of a baked phenolic coating, such as Heresite® or another type of protective finish.

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

The following digit, “0”, specifies the number of rows in the coil. For Carrier Chilled Water Coils, the row count typically ranges from 4 to 10. In this case, the “0” corresponds to a 10-row configuration.

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

The next pair of digits, “22”, represents the number of tubes across the face of the coil. These tubes determine the finned height of the unit. Carrier generally uses ½” tubes for chilled water coils, with counts ranging from 12 to 44 in increments of two. Here, the “22” implies a finned height of 27.5 inches. It’s worth noting that some Carrier models feature 5/8” tubes, so always double-check the actual finned height during installation.

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

The circuiting options for Carrier chilled water coils include H (half), F (full), and D (double). The appearance of an “F” in this section confirms that this coil has a full circuit configuration. To verify, ensure both the supply and return headers receive input from all 22 tubes.

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

The “G” provides crucial details about the coil’s construction, including the fin material, casing material, and fins per inch. Fin materials can be aluminum or copper; casings may be galvanized or stainless steel. The fins per inch vary between 8 and 14. In this instance, the “G” signifies copper fins with 8 fins per inch and a stainless steel casing. Each letter in this position—from A through J—can represent unique attributes, so don’t hesitate to reach out if you’re unsure about any specific designation.

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

The subsequent character, “A”, refers to the tube wall thickness, which is .017 (.016) inches of copper. Standard copper walls or thicker alternatives may also be available depending on the application.

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

The triplet “207” indicates the finned length of the coil, measured in centimeters. Converting this to inches gives us approximately 81.5 inches.

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

The “A” denotes a steel MPT connection. While the designation suggests the material, physical measurement remains key to confirmation.

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

Finally, the “L” signals left-hand airflow. An “R” would indicate right-hand airflow instead.

With countless variations possible within Carrier Chilled Water Coils, questions about decoding model numbers are bound to arise. Let the experts at Nationwide Coils guide you through the process to simplify your workday.

Keep an eye out for our next installment, where we’ll analyze a more frequently encountered Carrier Chilled Water Coil model: 28CW1620DA1112---K.

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