Which of the following statements describes when refrigerant oil must be replaced?

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Multiple Choice

Which of the following statements describes when refrigerant oil must be replaced?

The key idea is that refrigerant oil must be replaced whenever it has become contaminated by air or moisture, because those contaminants degrade lubrication and promote chemical problems in the system. If the system has been open to the atmosphere too long, air and moisture can enter the oil, causing oxidation and contamination. If the system is already saturated with moisture, the moisture content is high enough to cause acid formation and oil degradation. In either case, the oil’s effectiveness as a lubricant and its ability to protect components are compromised, so replacement is required. Since both conditions describe contamination that necessitates changing the oil, the correct conclusion is that both are reasons to replace the refrigerant oil.

The key idea is that refrigerant oil must be replaced whenever it has become contaminated by air or moisture, because those contaminants degrade lubrication and promote chemical problems in the system. If the system has been open to the atmosphere too long, air and moisture can enter the oil, causing oxidation and contamination. If the system is already saturated with moisture, the moisture content is high enough to cause acid formation and oil degradation. In either case, the oil’s effectiveness as a lubricant and its ability to protect components are compromised, so replacement is required. Since both conditions describe contamination that necessitates changing the oil, the correct conclusion is that both are reasons to replace the refrigerant oil.

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