Converting the Microchannel Coil in the Lennox® LCH156H4: Improve performance and reliability

When it comes to replacing commercial condenser coils, the Lennox LCH156H4 is often at the top of the list. This popular rooftop unit has long relied on all-aluminum microchannel coils, which offer some initial cost savings but come with hidden drawbacks.

One common solution for these units is converting the microchannel coil into a copper tube and aluminum fin design. This type of microchannel conversion isn’t just about changing materials—it’s about improving performance, reliability, and long-term value.

Microchannel coils have been widely used in HVAC systems for over a decade, especially in OEM equipment like Lennox. While they are cheaper and use less refrigerant, they also bring several challenges. For example, they tend to accumulate dirt quickly, require precise refrigerant charging, and are difficult to repair due to their fragile aluminum construction.

The Drawbacks of Microchannel Coils

Aluminum microchannel coils are prone to clogging and require regular cleaning to maintain optimal performance. If not maintained properly, high head pressure can lead to system inefficiencies. Plus, their small internal channels make them sensitive to refrigerant charge levels. Repairing them often involves complex methods like epoxy or torch welding, which can be time-consuming and risky in harsh weather conditions.

Why Upgrade to Copper Tube and Aluminum Fin Coils?

Switching to a copper tube and aluminum fin coil is more than just a material change—it's a performance upgrade. These coils are more durable, easier to maintain, and offer greater flexibility during repairs. One key advantage is the ability to pump down the system, which reduces downtime and saves money by avoiding full refrigerant recovery during service calls.

Other benefits include:

• Improved system longevity
• Reduced risk of leaks
• Lower maintenance costs over time
• More reliable operation under varying conditions

Completing the Circuit: What You Need to Know

When replacing a microchannel coil with a copper tube coil, it's important to replace all coils in the same circuit. This ensures proper refrigerant flow and avoids pressure imbalances that could damage the unit. For example, if your unit has four coils per circuit and one fails, you’ll need to replace all four to maintain system integrity.

Why Choose Nationwide Coils?

While the Lennox LCH156H4 is a common candidate for microchannel conversion, this upgrade is available for many other commercial HVAC units as well. With years of experience and thousands of conversions completed, Nationwide Coils has become a trusted name in the industry. Our team understands the nuances of each system and can help you make the right choice for your building’s needs.

If you're looking to improve the performance and reliability of your HVAC system, consider a microchannel coil conversion. Contact us today at 1.888.CoilPro or email us to get started. All we need is your unit’s make and model number to provide a detailed quote and guidance.