Which of the following statements about system pump down is false?

The statement that the liquid receiver service valve must remain in the mid position while the compressor is running is false. During a pump down process, the goal is to remove the refrigerant from the evaporator and other components to a designated storage area, typically in the receiver. This requires controlling the flow of refrigerant effectively.

When the compressor is running, the liquid receiver service valve should actually be in a position that allows for proper refrigerant flow. If the valve is left in the mid position, it may not adequately facilitate the movement of refrigerant, which could lead to improper system operation or inefficiencies. By fully opening or fully closing the valve depending on the specific operational requirements, the system can be managed correctly, allowing for effective suction line isolation and containment of refrigerant in the receiver.

Other statements about the pump down process highlight necessary actions and conditions that do align with proper procedures, such as turning off the compressor at the appropriate time and isolating the suction line, which ensures that the refrigerant is effectively removed from the evaporator and contained correctly in the receiver.