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An accumulator is used to
Adjust superheat levels
Prevent liquid refrigerant from reaching the compressor
Reduce noise in the system
Store excess refrigerant
The correct answer is: Adjust superheat levels
An accumulator is used to prevent liquid refrigerant from reaching the compressor. This is important because if liquid refrigerant enters the compressor, it can cause damage to the compressor due to its inability to compress liquids effectively. Instead, the accumulator ensures that only vapor refrigerant enters the compressor, thus protecting it from potential damage. Adjusting superheat levels, reducing noise in the system, and storing excess refrigerant are not the primary functions of an accumulator in an air conditioning system.