In HVAC systems, when pressures, subcool, and superheat fluctuate continuously without stabilizing, this indicates the presence of non-condensables, which requires complete system evacuation and recharging with new refrigerant, new driers, and a dry circuit; alternatively, high superheat combined with high subcool indicates a restriction such as a restricted drier, kinked liquid line, or improperly sized metering device.
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How to Troubleshoot NonCondensiblesAdded:
If you were to look at the the video again, I'm just going to let you watch that and just leave this up here just to explain, you know, these four things.
Pressures are moving up and down. Your subcool, it moves up and down. Your superheat, it moves up and down. And they never never do they compute. When you're in that situation, okay? Uh when you're in that situation, you have non-condensables. And there's only one way to fix that and that's to start all over again with new refrigerant, a nice dry circuit, new driers, everything. Um and it's just at a quick glance here, uh what we're looking at when for them to compute properly, that would be if we had a high superheat and a high subcool, we know that's a restriction. Either your drier's restricted, you got a kink somewhere in the liquid line, or you have um you have the wrong-sized metering device or bad metering device. That's as simple as that.
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