In hermetic compressors, when does the compressor draw refrigerant from the evaporator?

In hermetic compressors, the process of drawing refrigerant from the evaporator occurs during the suction stroke. This is the phase of the compressor's operation where the refrigerant vapor is pulled into the compressor from the evaporator, which is responsible for absorbing heat from the indoor environment. The suction stroke is crucial because it allows the low-pressure refrigerant vapor to enter the compressor, where it will then be compressed into a high-pressure vapor.

This process is vital for the refrigeration cycle to function correctly, as it ensures that the refrigerant is continuously circulating through the system, absorbing heat in the evaporator, and releasing it in the condenser. Understanding the timing and function of the suction stroke helps in diagnosing system issues and maintaining efficient operation.

While the other options reference related concepts, they do not correctly identify the specific action of drawing refrigerant into the compressor during its operation. For example, the discharge cycle refers to the release of high-pressure refrigerant after compression, and the cooling operation ties in with the overall function of the system rather than a specific action of the compressor. The mention of the reversing valve pertains more to heat pump systems, where the direction of refrigerant flow changes, rather than the fundamental operation of drawing refrigerant during the suction stroke.