Which combination of conditions promotes refrigerant migration to the compressor crankcase?

Prepare for the Refrigeration and Air Conditioning Mechanics (313A) Test. Study with flashcards and multiple choice questions, hints and explanations included. Ace your exam!

The combination of low temperature and high pressure is the condition that promotes refrigerant migration to the compressor crankcase. In refrigeration systems, refrigerant migration occurs when refrigerant flows out of the evaporator and accumulates in the compressor crankcase, which can lead to compressor inefficiency or damage.

When the temperature in the system is low, the refrigerant in the evaporator tends to condense, and if the pressure is high, the refrigerant will not vaporize easily. As a result, excess refrigerant in the form of liquid can migrate to the compressor crankcase, especially when the system is off or during low load conditions. This can happen because the high pressure in the compressor creates a scenario where the refrigerant is more likely to compress and condense further in the crankcase at lower temperatures.

Understanding these conditions is crucial for HVAC technicians to ensure that systems operate efficiently and prevent damage to the compressor.

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