Cool Star® tandem condensing units are a simpler alternative to rack units. The oil management is replaced by a direct connection of the compressors. The cooling capacity is controlled in the range of 0-50-100 %. In the case of the Copeland Digital compressor, the units provide precise control of evaporation pressure and temperature at different loads. The units are suitable for use in HVAC systems and for systems with multiple loads, eg. in supermarkets, food processing, manufacturing and technological facilities etc.
The units are designed to operate with conventional group A1 HFC refrigerant, depending on the compressor type and operating conditions. Depending on the type of refrigerant used, the range of evaporation temperatures is from -50 °C to +20 °C. For higher evaporation temperatures and / or higher ambient temperatures, the units are equipped with a larger condenser for trouble-free operation. The units are supplied with a protective inert gas fill.