What are the key differences between pump down and pump out procedures?

The pump down procedure involves the controlled removal of refrigerant from the evaporator and condenser, whereas the pump out procedure entails removing refrigerant from the entire chiller system. Pump down is typically performed for routine maintenance, such as cleaning or replacing components, while pump out is usually performed during major repairs or system replacement. Understanding the differences between these procedures is crucial to ensure that the correct process is followed and the system is properly maintained.