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SkillCat EPA Universal Practice Test

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Charging liquid R-245fa into a low-pressure refrigeration system under a vacuum greater than 18 inches Hg vacuum can cause the;
Correct Answer:
System water to freeze
Explanation:
When a deep vacuum is present, any moisture in the system is exposed to very low pressure and extreme cooling as liquid refrigerant is introduced. That cold, moisture-laden environment causes the water in the system to freeze, forming ice inside lines, filters, or metering devices. This ice can restrict flow and disrupt the system’s operation, which is why the outcome described is that the system water freezes. Other issues like oil acidity, overheating, or refrigerant instability aren’t the immediate effect of charging under this level of vacuum.

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