After installation of a field-piped R-410A split heat pump the unit should first be?

After the installation of a field-piped R-410A split heat pump, the unit should first undergo a thorough leak test to ensure that all connections are secure and there are no refrigerant leaks. Following this, the system should be vacuumed to remove moisture and air from the refrigerant lines, achieving a vacuum level of at least 500 microns. Once these steps are complete, the unit can be charged with the appropriate amount of refrigerant and tested for proper operation.