The process of pumping a system's entire refrigerant charge into the liquid receiver is called what?

The process of pumping a system's entire refrigerant charge into the liquid receiver is known as pump-down. This method is frequently employed in HVAC systems to manage refrigerant during service or maintenance activities. When the system is in pump-down mode, the compressor continues to run, and the refrigerant is drawn from the evaporator and condensed back into the liquid receiver until the system pressure reaches a predetermined low level. This process prepares the system for repairs while minimizing refrigerant loss.

The remaining options represent different procedures used in refrigeration and air conditioning practices. Recovery refers to the process of removing refrigerant from the system and storing it for recycling or disposal, while evacuation involves removing moisture and air from the refrigeration system to create a vacuum before charging it with refrigerant. Triple evacuation is a more thorough vacuum technique that involves multiple cycles of evacuating and re-vacuuming to ensure any remaining moisture and contaminants are eliminated, enhancing the system's efficiency. Each of these methods serves a distinct function, emphasizing why pump-down is the correct response for this scenario.