Converting the Microchannel Coil in the Carrier® AquaSnap® Chiller: Improve performance and reliability

When it comes to commercial condenser coils, the Carrier AquaSnap chiller is often at the top of the list for replacement needs. One common approach is converting its all-aluminum microchannel coil into a copper tube, aluminum fin design — a move that can significantly improve both performance and reliability.

Microchannel coils have been widely used in HVAC systems for over a decade, not just in Carrier units but across many OEM equipment brands. They’re favored for their lower material costs and reduced refrigerant charge, which helps keep prices down. However, these benefits come with some serious drawbacks that can affect long-term performance and maintenance.

A Carrier AquaSnap chiller with all-aluminum microchannel coils.

The Challenges of Microchannel Coils

One of the biggest issues with microchannel coils is their tendency to clog easily, similar to a dirty dryer filter. Without regular cleaning, this buildup can lead to high head pressure and operational problems. Additionally, these coils require very precise refrigerant charging due to their low refrigerant capacity. Any small leak or miscalculation can cause the system to underperform or fail entirely.

Repairing an aluminum microchannel coil is also tricky. It often requires specialized techniques like two-part epoxy or torch welding, which can be time-consuming and costly. Plus, aluminum is more sensitive to environmental conditions, making repairs less reliable over time. Another issue is the risk of connection leaks where copper lines meet the aluminum coil, leading to potential refrigerant loss and system downtime.

#ChangeTheChannel: Why Upgrade to Copper Tube, Aluminum Fin Coils?

Switching to a copper tube, aluminum fin coil — commonly referred to as a microchannel conversion — is a smart upgrade that can transform your Carrier AquaSnap chiller. This type of coil is more durable, easier to maintain, and far more efficient when it comes to repairs.

Key benefits include:

• Greater durability – Copper is more resistant to corrosion and damage than aluminum, offering longer service life.
• Easier repair and maintenance – Unlike microchannel coils, copper tube coils are simpler to fix, reducing downtime and labor costs.
• Ability to pump down the system – With copper tube coils, you can pump refrigerant into the condenser during repairs, eliminating the need to recover the entire system’s refrigerant. This saves time and money.
• Reduced long-term costs – By minimizing leaks and repair frequency, you save on refrigerant loss and maintenance expenses over time.

A Carrier AquaSnap chiller with copper tube, aluminum fin coils.

Completing the Circuit: What You Need to Know

If you're replacing the microchannel condenser coil with a copper tube version, it's important to complete the circuit properly. For example, if the unit has eight microchannel coils arranged in four circuits, and one coil fails, you’ll need to replace all four to ensure even refrigerant distribution and proper operation. This is because copper tube coils have different refrigerant pressure drops compared to microchannel designs. Mixing them could lead to imbalances and system inefficiencies.

#MastersOfMicrochannelConversion

While the Carrier AquaSnap chiller is one of the most common units requiring a microchannel conversion, this upgrade is available for virtually any major commercial HVAC system. Over the years, we’ve successfully converted thousands of units, making Nationwide Coils the go-to experts in this field.

If you're looking to improve the efficiency, reliability, and lifespan of your cooling system, consider a microchannel coil conversion. Our team of specialists is here to help. Contact us today at 1.888.CoilPro or email us anytime. Just provide the make and model of your unit, and we'll get started right away.