Advantage FAT, 3e ASE 7 Heating and Air con The only way to tell what type of refrigerant is in i system is by using is b. Rethyerant identifier c. Refrigerant vacuum pump. d. Retigeram dye

The correct answer is b. Refrigerant identifier.<br /><br />A refrigerant identifier is a device used to detect the type of refrigerant in a system. It can be used to identify the specific refrigerant being used in the air conditioning or heating system. This is important because different refrigerants have different properties and require different handling and maintenance procedures.<br /><br />Refrigerant vacuum pumps (option c) are used to remove refrigerant from a system, but they do not identify the type of refrigerant. Refrigerant dyes (option d) are added to refrigerants to make them easier to detect, but they do not identify the type of refrigerant.<br /><br />Therefore, the only way to accurately determine the type of refrigerant in a system is by using a refrigerant identifier.