These models are designed to work with a natural CO2 refrigerant with an extremely low global warming potential (GWP) of only 1. This range uses the latest technologies such as the Stream series compressor, which are distinguished by their quiet and reliable reliability. The built-in frequency converter adjusts the compressor speed according to the current needs of the system. Electronically commutated fans remove heat from the gas cooler in the most efficient and quiet manner.