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

If you're familiar with Carrier 39N and 39T air handlers, you've likely come across this particular chilled water coil model. The model number holds all the information you need to accurately quote the coil. So, let’s break it down step by step:

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

Starting with the basics, the “28NC” signifies that this is a chilled water coil designed for optimal cooling performance in various HVAC systems.

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

The next character, the “2”, indicates that this coil is positioned vertically and does not have any additional coatings applied. Had there been a letter here instead, it would imply that the coil features a baked phenolic coating, possibly Heresite® or another type of protective layer.

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

This digit, “0”, refers to the number of rows in the coil. For Carrier Chilled Water Coils, this can range from 4 to 10 rows. In this case, a “0” means the coil has 10 rows, providing enhanced heat exchange efficiency.

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

The following pair of digits, “22”, denote the number of tubes visible across the face of the coil, which corresponds to its finned height. Carrier typically uses ½” diameter tubes for these coils, with the tube count ranging from 12 to 44 in increments of two. Here, with 22 tubes, the finned height of the coil measures 27.5 inches. However, some Carrier models may feature 5/8” tubes, so always verify the actual finned height when ordering.

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

Carrier provides several circuiting options for their chilled water coils, indicated by letters H, F, or D, meaning half, full, or double circuit configurations. The presence of an “F” in this model specifies the full circuit configuration. To ensure accuracy, confirm that all 22 tubes feed into both the supply and return headers.

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

The “G” reveals critical details about the coil’s construction: the fin material, casing material, and fins per inch. Fin materials include aluminum and copper, while casings can be either galvanized or stainless steel. The fins per inch vary between 8 and 14. In this instance, the “G” denotes copper fins with 8 fins per inch and a stainless steel casing. Always expect a letter in this position, as each letter corresponds to specific attributes—don’t hesitate to reach out if you’re unsure!

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

The subsequent digit, “A”, indicates the copper tube wall thickness. This particular coil uses .017-inch-thick (.016-inch-thick) copper tubing, which is standard. Thicker walls may be available depending on application requirements.

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

The final three digits, “207”, represent the finned length of the coil in centimeters. Since we typically think in inches, converting this value to inches gives us approximately 81.5 inches.

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

The “A” signifies a steel MPT (Male Pipe Thread) connection. Always double-check the exact size during installation.

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

Lastly, the “L” confirms left-hand airflow. An “R” would indicate right-hand airflow.

With hundreds of variations possible, Carrier Chilled Water Coils can seem overwhelming. If you have questions about decoding a specific model number, leave it to the experts at Nationwide Coils—they’ll simplify your life.

Stay tuned for our next installment where we dive into another commonly encountered Carrier Chilled Water Coil model: 28CW1620DA1112---K.

Written by seasoned HVAC professionals with nearly two decades of industry expertise, the Nationwide Coils Blog delivers practical insights into commercial HVAC products and services. Feel free to email us with any queries—you won’t regret it!