| 摘要 |
Temperatures in the inside heat exchanger or both the inside and outside heat exchangers of a reversible vapor compression refrigeration system are sensed before and after a system startup or mode change. If the reversing valve is positioned properly, the temperature should change in a certain way because of the operating change, e.g., on a startup in cooling mode, the inside heat exchanger temperature should decrease. If the temperatures actually sensed do not change in the predicted way, it is an indication that the reversing valve is incorrectly positioned for the operating mode selected. If the temperature changes indicate that the reversing valve is out of position, the variable speed compressor is operated at its maximum speed for a short time. If the temperature change is now as expected, the valve has changed to the proper position. If the temperatures still have not changed in the way predicted, the reversing valve is still improperly positioned. This indicates a malfunctioning valve and the system is shut down.
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