Nylog, Oil? Where does it go? - Short #238 · HVAC School - For Techs, By Techs summary

Key takeaways

NILOG is a thickened refrigerant oil that can enhance the performance of flare connections without voiding warranties.
Proper application techniques for NILOG include applying small amounts on flare surfaces while being mindful of torque settings.
NILOG should not be considered a leak lock or a traditional sealant; rather, it's used to prevent galling and improve seal quality.

Summary

Understanding NILOG

In this episode, Bryan dives deep into the controversial topic of NILOG, a thickened refrigerant oil commonly used in HVAC applications. He clarifies that NILOG, primarily a thickened version of POE oil, is miscible with refrigerants and does not clog systems when used correctly. He contradicts myths claiming that NILOG voids warranties, emphasizing that no one has ever proven it to cause such issues. Bryan shares practical advice on applying NILOG to flares, reinforcing its benefits in making connections smoother and preventing galling.

Application Techniques for NILOG

Bryan shares best practices for using NILOG in HVAC work, suggesting to apply a small amount to the front and back of flare connections. He explains that while it can be applied to threaded connections, techs should adjust torque specifications accordingly to avoid over-tightening. He reflects on personal experiences using NILOG, citing positive outcomes in achieving tight seals and preventing leaks.

Debunking Myths and Conventions

A major focus of the discussion revolves around debunking myths associated with NILOG and its application. Bryan addresses the common misconception that NILOG is a leak lock or a conventional thread sealant. He highlights that the product remains usable under vacuum and advocates for its effectiveness without having to adhere strictly to new torque conventions, providing practical examples to back up his points.

Show notes

In this short podcast, Bryan answers a listener-submitted question about Nylog, oil, and where you put them when you're making flares.

Nylog is a thickened refrigerant oil (which is either POE for Nylog Blue or mineral oil for Nylog Red), and it's miscible with the refrigerant and moves with it through the circuit. You don't want to put excess Nylog on valves, but a small amount won't do harm. There are a lot of concerns about Nylog voiding the warranty, but it doesn't actually do that because it's nearly impossible to prove that Nylog caused the issue.

Like oil, Nylog helps connections fit together (even threaded connections) and prevents galling. However, oil and Nylog also reduce friction, which will affect your torque specs when you use a torque wrench to tighten a connection. You don't need to tighten it as much, as you risk overtightening otherwise.

When you apply Nylog, put a little bit on the front and back face of a flare (and the cone of the flaring block if you wish). You can put a small bead on the threads, but it's not an issue as long as you stay aware of your adjusted torque specs (low range). In our experience at Kalos Services, Nylog is particularly useful under vacuum and has helped us make high-quality flares that last a long time. Remember: Nylog is NOT leak lock, and it's not a traditional thread sealant.

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Nylog, Oil? Where does it go? - Short #238