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

Carrier chilled water coils are commonly found in units like the 39N and 39T air handlers. The model number is more than just a string of letters and numbers—it’s a detailed code that tells you everything you need to know for accurate quoting and replacement. Let’s take a closer look at the model 28NC2022FGA207AL:

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

The first part, "28NC", identifies the coil as a chilled water unit. This is the base designation for all chilled water coils in Carrier’s lineup.

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

The next digit, "2", indicates the coil’s orientation. A "2" means it's installed vertically without any coating. If there were a letter here (like "C" or "H"), it would mean the coil has a protective coating, such as baked phenolic or Heresite®.

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

The third character, "0", tells us how many rows the coil has. In this case, "0" stands for a 10-row coil. Other common options include 4, 6, or 8 rows.

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

The next two digits, "22", indicate the number of tubes in the coil face. This helps determine the finned height. For standard ½” tubes, 22 tubes typically mean a finned height of 27.5 inches. However, always double-check with actual measurements, as some models may use 5/8” tubes.

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

The next character, "F", refers to the circuiting type. Here, "F" stands for full circuit, meaning all 22 tubes are connected to both the supply and return headers. Other options include "H" for half-circuit and "D" for double-circuit.

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

The fifth character, "G", gives information about the fin material, casing material, and fins per inch (FPI). In this case, "G" means copper fins with 8 FPI and a stainless steel casing. This combination is common in high-performance applications.

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

The next digit, "A", specifies the tube wall thickness. "A" indicates a standard 0.017-inch copper tube wall. Thicker walls may be used in certain environments where durability is key.

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

The next three digits, "207", represent the finned length. While it might seem like an odd format, this number is given in centimeters. So 207 cm converts to approximately 81.5 inches. Always verify the actual size before ordering.

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

The next character, "A", denotes the connection type. In this case, "A" stands for a steel MPT (Male Pipe Thread) connection. It's important to measure the connection size to confirm compatibility.

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

Finally, the last letter, "L", indicates the air flow direction. "L" means left-hand airflow, while "R" would mean right-hand airflow. This is critical for proper installation and system performance.

As you can see, there are countless combinations when it comes to Carrier chilled water coils. Whether you're trying to identify a specific model or just want to understand what a model number means, decoding these parts can be time-consuming if you're not familiar with the system.

If you’re ever unsure about a coil model or need help identifying one, don’t hesitate to reach out to HVAC professionals who specialize in Carrier products. At Nationwide Coils, we’ve been helping HVAC technicians and engineers for over two decades—let us simplify your job.

Stay tuned for our next guide, where we’ll decode another common Carrier chilled water coil: 28CW1620DA1112---K.

The Nationwide Coils Blog is written by HVAC experts with nearly 20 years of experience in commercial HVAC systems. We provide valuable insights into products, services, and industry trends. Feel free to email us anytime with your questions or requests.