Final answer:
A higher than normal discharge pressure serves as an indication of a leak in a refrigeration system, while excessive superheat or subcooling are not direct signs of a leak.
Explanation:
Higher than normal discharge pressure is an indication of a leak in a medium or high-pressure refrigeration system. When there is a leak, the discharge pressure tends to increase due to the reduced efficiency of the system.
Excessive superheat or subcooling are not direct indications of a leak in the system; they may be caused by other factors like improper refrigerant flow or system issues.
Therefore, monitoring the discharge pressure is crucial in identifying potential leaks in refrigeration systems.
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