Short instructional excerpt (YouTube video) explaining how to interpret HVAC vacuum test behavior: if a pulled vacuum falls briefly then rebounds or never settles, that indicates a leak. The speaker advises flushing and pressurizing the system to locate and repair the leak if the vacuum doesn't hold after an extended pull.
If you pull in a vacuum, for those that are newer to this, if you're pulling a vacuum and it stays at doesn't start counting down for an extended period of time, chances are there's a leak. So if you sitting there and might kick down to 12 and then go right back out to, you know, where it's like dash, dash or NL or whatever. Na. And it kicks down to 12, there's probably a leak in that system style. If you pull for 30 minutes and it still hadn't. Yeah, like stop. You need to flush it. You need to pressurize that system and find where that leaks at. Okay.
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