Where is a sight glass typically located in a refrigeration system?

A sight glass is typically located in the liquid line before the metering device in a refrigeration system. This positioning allows technicians to observe the state of the refrigerant as it leaves the condenser and before it enters the expansion device. The sight glass provides a visual indication of whether the refrigerant is in a vapor or liquid state.

When the sight glass shows a clear liquid, it indicates that the refrigerant is in the correct state for the metering process, which is essential for efficient cooling performance. If bubbles or foam are visible, it may signal that there is an issue with the system, such as low refrigerant levels or problems in the condenser. This visibility helps technicians quickly diagnose issues and ensure the cooling cycle operates effectively.