What visual indicator shows that a vapor-cycle cooling system is operating correctly after charging?

The indicator that shows a vapor-cycle cooling system is operating correctly after charging is a clear sight glass. A clear sight glass indicates that there is no moisture or bubbles in the refrigerant line, which signifies that the system is properly charged and functioning effectively. When the system is operating correctly, the refrigerant should flow through the sight glass smoothly without any obstructions, and the absence of bubbles suggests that both the refrigerant charge and the moisture level in the system are appropriate.

After charging, the performance of the system ensures the optimal functioning of the vapor-cycle cooling system. A sight glass that is clear indicates proper liquid flow and confirms that the system is not experiencing any issues with condensation or contamination, which could affect its efficiency.

Understanding the function of each visual indicator is crucial for diagnosing and maintaining a vapor-cycle cooling system, thus reinforcing the importance of a clear sight glass as a reliable measure of operational status.