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A liquid receiver is used to

  1. Prevent liquid refrigerant from reaching the compressor

  2. Remove moisture from the system

  3. Store liquid refrigerant

  4. Sub-cool the liquid refrigerant

The correct answer is: Prevent liquid refrigerant from reaching the compressor

A liquid receiver is used to prevent liquid refrigerant from reaching the compressor. Liquid refrigerant entering the compressor can cause damage and reduce the efficiency of the system. The receiver acts as a storage tank for liquid refrigerant, ensuring that only vapor refrigerant is fed into the compressor. This helps protect the compressor from potential damage and allows it to operate more efficiently. The other options are not the primary purpose of a liquid receiver in an air conditioning system.