Suction line accumulators are used between evaporator and compressor and prevent liquid absorption of the compressor. They keep liquid and facilitate sending only vaporous refrigerant flow. Oil accumulated in the accumulator is absorbed from hollow in the return pipe and returns to the compressor with gas. The accumulators must be placed in a distance which is close to the compressor. The fact that it has muffler effect facilitates that voice in the suction pipe is taken. In the applications in which evaporation temperature is too low (at temperatures under -10°C), the suction line accumulator having heat exchanger system is used to facilitate that liquid is vaporized, decrease viscosity of the oil and to provide its low easily.