What is the primary reason for installing sight glasses in a liquid line?

The primary reason for installing sight glasses in a liquid line is to check the indication of moisture and change. Sight glasses allow technicians to visually inspect the refrigerant flow and its condition within the system. One critical aspect they reveal is the presence of moisture. Moisture in refrigerants can lead to several issues, including corrosion and acid formation that can damage the system.

When looking through a sight glass, a technician can typically see the color and clarity of the refrigerant. If the refrigerant appears cloudy or contains bubbles, this might indicate that the system has absorbed moisture or there are other issues that require attention. Monitoring these conditions helps maintain system efficiency and longevity, making the sight glass a vital component in identifying potential problems early on.