If the liquid line filter/drier pictured in figure "C" of the illustration becomes mechanically restricted with solid impurities, what would be the indication? See illustration GS-RA-10.
• Flow through a liquid line filter/drier and where the pressure drop occurs when it plugs with debris • What causes bubbles in a sight glass versus what causes the moisture indicator color to change • How a restriction in a liquid line affects temperature at the inlet and outlet of the restricted component
• If the filter/drier is mechanically restricted, on which side (upstream or downstream) will the pressure be higher, and what does that mean for the refrigerant state there? • Does a moisture-indicating sight glass change color because of flow restriction or because of actual water content in the refrigerant? • Where would refrigerant be most likely to flash (change from liquid to a mix of liquid/vapor): just before a restriction or just after it?
• Be clear about the meanings of upstream vs downstream in relation to the filter/drier and the sight glass location in the question • Separate in your mind moisture indication (color change) from flash gas / bubbles (flow and pressure effect) • Think about which surface of a restricted filter/drier would be warmer and which would be colder due to the pressure drop and partial vaporization of the liquid refrigerant
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