What does a chemical dot placed under the sight glass indicate when exposed to liquid refrigerant?

A chemical dot placed under the sight glass indicating exposure to liquid refrigerant serves as a moisture indicator. This dot reacts to moisture in the system; when water enters the refrigerant, the dot changes color or appearance, signaling that there is moisture present. Moisture in refrigerant systems is undesirable as it can lead to ice formation, corrosion, and ultimately damage the system. Therefore, this visual cue is critical for maintaining the reliability and efficiency of the refrigeration system by alerting operators to investigate and potentially address moisture problems.

In refrigeration systems, the presence of moisture can lead to several operational issues. Understanding this indication helps operators make informed decisions about maintenance and necessary actions to keep the system running smoothly.