What condition describes a sight glass in a full liquid line?

A sight glass in a full liquid line should appear clear when it is functioning correctly. This indicates that the refrigerant is in a liquid state and that there are no bubbles, which would suggest the presence of vapor in the liquid line. A clear sight glass confirms that the system is properly charged and that the refrigerant is flowing smoothly. It is an essential part of monitoring refrigerant conditions within the system; any deviation from clarity might indicate problems such as insufficient refrigerant, potential leaks, or issues with the expansion device.

Other conditions, such as being cloudy, bubbly, or frosted, indicate issues that require corrective action. These conditions would suggest the presence of moisture, vapor, or an ice blockage, respectively, which could compromise the efficiency and safety of the refrigeration system. Thus, the clarity of the sight glass is a key indicator of proper system operation in a full liquid line.