🔍 Key Concepts

• Liquid line sight glass function in a refrigeration system • How refrigerant charge level affects liquid vs. vapor in the liquid line • Typical visual indications of proper vs. improper refrigerant charge

💭 Think About

• Think about what should normally be visible in the liquid line sight glass when the system is fully charged and running correctly. • Consider what happens inside the liquid line when the system is low on refrigerant: does it stay a solid column of liquid, or does something else start to appear? • Which of the options reflects a condition that suggests the presence of vapor or flashing in the line instead of pure liquid?

✅ Before You Answer

• Recall whether a properly charged system’s liquid line sight glass is normally clear or shows something moving. • Ask yourself which choice indicates mixture of liquid and vapor rather than solid liquid. • Verify that you are focusing on the refrigerant level indication, not color-coding or moisture indicators.