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Normal Subcooling, Hidden Restriction - Short #305
A liquid-line restriction should cause high subcooling, right? Not always. In this short episode of the HVAC School podcast, we look at why normal subcooling does not rule out a restriction and why one familiar diagnostic pattern cannot tell the whole story.
Subcooling describes the refrigerant's temperature margin below saturation at a particular location. It does not directly measure how much refrigerant is stored in the condenser or prove that the metering device is receiving adequate liquid. A thermostatic expansion valve may compensate for a moderate restriction by opening farther, while…
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