This is why quality matters! 🛠️ Look at that carbon buildup
Let’s be serious about this: The installation manual says you MUST purge with nitrogen for a reason. It’s a no-brainer. Is the compressor going to blow up the second you leave the driveway? No, it most certainly will not .... But that’s not the point. When you’re brazing with oxyacetylene tanks and without nitrogen, you’re creating cupric oxide (that black soot) inside the lines.
On a modern VRF system, you’re dealing with EEVs (Electronic Expansion Valves) that have incredibly tight tolerances. Those flakes don't just disappear; they clog screens, contaminate the POE oil, and lead to "unexplained" service calls down the road. If you want the system to reach its 15-year life expectancy, follow the manual to the letter.
Or simply use a product like Stay Brite #8 on the lines. It's simple and gets the job done, even with liabilities. Don’t be the reason a VRF system fails prematurely just to save 5 minutes on a setup. 🛠️❄️