When a sight glass changes color, the system contains excessive ______.

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Multiple Choice

When a sight glass changes color, the system contains excessive ______.

Explanation:
Moisture in the refrigerant system is what a sight glass color change signals. The sight glass lets you visually assess the refrigerant quality; when water is present, tiny droplets scatter light and the liquid often appears cloudy or milky. This change is a warning because excess moisture can form acids, cause ice in the metering devices, and create oil emulsions that impair lubrication and performance. The fix is to evacuate and dry the system (replacing the dryer if needed), then recharge with dry refrigerant. Air or oil can affect the sight glass in other ways, but they don’t produce the same moisture-induced color change.

Moisture in the refrigerant system is what a sight glass color change signals. The sight glass lets you visually assess the refrigerant quality; when water is present, tiny droplets scatter light and the liquid often appears cloudy or milky. This change is a warning because excess moisture can form acids, cause ice in the metering devices, and create oil emulsions that impair lubrication and performance. The fix is to evacuate and dry the system (replacing the dryer if needed), then recharge with dry refrigerant. Air or oil can affect the sight glass in other ways, but they don’t produce the same moisture-induced color change.

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