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

Carrier chilled water coils are commonly found in systems like the 39N and 39T air handlers. Understanding the model number is key to quoting or replacing the right coil. Let’s take a closer look at the model 28NC2022FGA207AL and break it down:

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

The “28NC” identifies this as a chilled water coil. The “28” refers to the series, while “NC” stands for "non-coated." This is the starting point for identifying the type of coil you're working with.

2 – This number indicates the coil’s orientation. A “2” means it's installed vertically with no coating. If there were a letter here, it would indicate a baked phenolic coating, such as Heresite® or another protective finish.

0 – This digit tells us the number of rows in the coil. A “0” means it has 10 rows. Other options include 4, 6, or 8 rows, depending on the model.

22 – This represents the number of tubes in the face of the coil. Carrier typically uses ½” tubes, and the range goes from 12 to 44, increasing by two. So, 22 tubes mean the finned height is 27.5 inches. Keep in mind that some coils may use 5/8” tubes, so always double-check the dimensions.

F – This letter refers to the circuiting style. “F” stands for full circuit, meaning all tubes are connected to both the supply and return headers. Other options include “H” (half) and “D” (double).

G – This code provides information about the fin material, casing, and fins per inch. “G” means copper fins, 8 fins per inch, and a stainless steel casing. Each letter from A to J can represent different combinations, so it’s always good to confirm with the manufacturer or a specialist.

A – This letter indicates the tube wall thickness. “A” corresponds to a .017” (or .016”) copper tube wall. There are also thicker options available if needed.

207 – These three digits represent the finned length in centimeters. Converting 207 cm to inches gives us approximately 81.5 inches. Always verify this measurement when replacing or ordering a coil.

A – This letter specifies the connection type. “A” means a steel MPT (male pipe thread) connection. Make sure to measure the actual size to confirm compatibility.

L – Finally, the last letter indicates the airflow direction. “L” stands for left-hand airflow, while “R” would mean right-hand airflow.

As you can see, there are countless variations in Carrier chilled water coils. Whether you’re a technician, engineer, or HVAC professional, decoding these model numbers is an essential skill. If you ever need help interpreting a coil model or want to ensure accuracy, don’t hesitate to reach out to experts like Nationwide Coils.

Stay tuned for our next post, where we’ll decode a more common model: 28CW1620DA1112---K.

The Nationwide Coils Blog is written by HVAC professionals with nearly two decades of experience in commercial HVAC systems. We provide practical insights, product knowledge, and helpful tips for industry professionals. Feel free to email us anytime with questions or feedback.