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

Carrier chilled water coils are commonly found in air handlers like the 39N and 39T models. Understanding the model number can help you quickly identify the correct coil for replacement or quotation. Let’s go through the breakdown of the 28NC2022FGA207AL step by step:

28NC – This prefix identifies the coil as a chilled water coil. It's important to distinguish it from other types like heating or heat pump coils.

2 – This number indicates that the coil is installed in a vertical position with no coating. If there was a letter here, such as “C” or “H,” it would indicate a protective coating like Heresite® or baked phenolic.

0 – This digit tells us how many rows the coil has. A “0” means it’s a 10-row coil. Other options include 4, 6, or 8 rows.

22 – This number represents the number of tubes in the face of the coil. For Carrier, this typically refers to ½-inch diameter tubes. A 22-tube configuration usually corresponds to a finned height of 27.5 inches. Always double-check the actual measurements when possible.

F – This letter stands for full circuiting. Other options include H (half) and D (double). Full circuiting means all 22 tubes are connected to both the supply and return headers.

G – This code specifies the fin material, casing material, and fins per inch. In this case, “G” means copper fins at 8 fins per inch with a stainless steel casing. Different letters correspond to different combinations, so it’s always good to verify if you're unsure.

A – This indicates a .017 (or .016) copper tube wall thickness. Some coils may have a thicker wall for durability, depending on the application.

207 – These three digits represent the finned length in centimeters. Converting 207 cm to inches gives us approximately 81.5 inches. Keep this in mind when measuring or ordering replacements.

A – This letter denotes a steel MPT (male pipe thread) connection. While it gives a general idea of the fitting type, it’s still recommended to measure the actual size for accuracy.

L – Finally, the last letter, “L,” indicates left-hand airflow. If it were an “R,” it would mean right-hand airflow. This is crucial for installation and performance.

As you can see, each part of the model number plays a role in identifying the coil’s specifications. With over 100 possible configurations, decoding these numbers can be tricky without experience. At Nationwide Coils, we specialize in helping HVAC professionals like you navigate these details with ease.

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

The Nationwide Coils Blog is written by HVAC experts with nearly two decades of industry experience. We provide valuable insights into commercial HVAC products and services—feel free to email us anytime with your questions.