“Get Your Fix” Part 2 of 10: YORK® YLAA

As we continue our coil issue countdown, we're focusing on the YORK® YLAA chiller—a unit that has consistently faced operational challenges and durability concerns, especially with its MCHX condenser coils. In fact, we receive multiple calls each week from contractors and building operators about leaks and failures in the original microchannel coils.

Many customers are frustrated with the performance of this OEM model, which has negatively impacted York’s reputation. While the YLAA was available with both microchannel and copper tube coils, the latter is rarely seen in the field—most units come equipped with the less durable microchannel version.

The usual suspects

The most commonly encountered YLAA units are the Style B models, which feature microchannel condenser coils in both standard and high-efficiency versions. Identifying whether you're dealing with a standard or high-efficiency unit is simple: check the model number. For example, "S" in YLAA0700SE stands for standard, while "H" in YLAA0156HE indicates high efficiency. If you see "ZE" in the model number, like in YLAA0080ZE, that unit originally came with copper tube coils.

So, what's the solution? #ChangeTheChannel

Converting the microchannel coil in the YORK® YLAA chiller to a copper tube condenser coil can significantly improve reliability and make servicing easier, all while maintaining OEM efficiency levels.

One important thing to note: when upgrading from microchannel to copper tubes, it’s essential to replace the entire circuit. If one coil is leaking and it’s part of a system with four coils, all four must be replaced. Depending on the unit size, YLAA chillers can have between 4 to 12 coils.

A York YLAA unit before microchannel conversion.

The same York YLAA unit after converting to copper tubes and applying a Blygold® coating.

If you only want to replace one coil, we recommend contacting York directly and purchasing an MCHX coil from them. At Nationwide Coils, we don’t just replace one coil because it’s a temporary fix and won’t resolve the underlying issues with the YLAA unit.

Although the YORK YLAA is one of the more popular units we convert, we offer microchannel conversions for any make or model. Whether you're looking to upgrade your existing system or prevent future issues, we’re here to help.

The Nationwide Coils Blog is a commercial HVAC blog written by industry experts with nearly two decades of experience in the field. We provide valuable insights into commercial HVAC products and services and encourage you to email us anytime with your questions or feedback.