What is a simple method to determine if a particular overfeed evaporator is over-adjusted?

In evaluating whether an overfeed evaporator is over-adjusted, turning off the liquid supply solenoid and measuring the temperature provides a clear method to assess the system's performance. When the liquid supply is halted, it allows observation of how the evaporator reacts under those conditions.

If the evaporator is functioning correctly, the temperature should stabilize at a certain point that indicates the system is not receiving excess refrigerant. An excessively low temperature or rapid fluctuations can indicate that the system is indeed overfed, meaning it is receiving more refrigerant than it can efficiently vaporize. This scenario can often lead to efficiency issues or flooding within the evaporator.

In comparison, other methods like examining the frost line or adjusting the back-pressure regulator may not provide direct insights into whether the overfeed scenario is happening. These methods might help gauge evaporator performance or pressure but do not specifically target the issue of over-adjustment in the liquid feed. Therefore, measuring temperature with the liquid supply disabled offers a straightforward and effective assessment method for verifying the proper adjustment of the overfeed evaporator.