Suction line accumulators in heat pump systems primarily function as what?

• A. Receivers
• B. Filters
• C. Pressure regulators
• D. Gas meters

Answer: (A)

On the suction side of a heat pump, the accumulator’s main job is to store refrigerant and separate any liquid that might be carried with the suction gas, so only vapor enters the compressor. This acts as a reservoir on the low-pressure side, catching liquid refrigerant and preventing it from slugging the compressor, which protects the compressor and helps maintain stable suction conditions. It’s not designed to filter, regulate pressure, or measure gas, which is why the storage/receiving function is the best description of its role.