Which device is responsible for turning off the compressor after it has pumped down?

Prepare for the Master Mechanical License Test with flashcards and multiple-choice questions. Each question includes hints and detailed explanations. Get confident for your exam!

The device responsible for turning off the compressor after it has pumped down is the low pressure switch. This component is designed to monitor the pressure within the refrigeration system. When the system reaches a predetermined low pressure, typically after the compressor has successfully removed refrigerant from the evaporator, the low pressure switch opens the circuit, stopping the compressor from running.

In practical terms, the low pressure switch ensures that the compressor does not operate under conditions that could lead to damage due to low refrigerant levels or other issues related to low pressure. This feature is crucial for maintaining the efficiency and longevity of the refrigeration system.

The other options serve different purposes. The low-pressure control likely refers to a broader category of switches designed to manage operational pressures but is not as specific as the low pressure switch. A pressure relief valve is designed to prevent excessive pressure in the system, and a thermal expansion valve regulates the flow of refrigerant into the evaporator but does not directly control the compressor's operation. Therefore, the low pressure switch is the correct choice for this function within the system.

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