What is a moisture indicating sight glass used for?

A moisture indicating sight glass is used to check for moisture in refrigerant. This component is designed to provide a visual indicator of the moisture level within the refrigerant system. Moisture can be detrimental to the functioning of the system as it can lead to corrosion and the formation of acids, which can damage the compressor and other components.

When the refrigerant passes through the sight glass, the presence of moisture is indicated by a color change or other visual cue, alerting the technician to potential issues. By regularly monitoring this indicator, technicians can ensure that the refrigerant remains dry and the system operates efficiently, reducing the risk of costly repairs due to moisture-related damage. Monitoring moisture levels is especially critical in HVAC applications where the reliability and efficiency of the system are paramount.