Compressors operate in two kinds of alternating stages: the “loaded stage” and the “unloaded stage”. During the loaded stage, the compressor outputs full capacity (1), while during the unloaded stage, the compressor has no capacity output (0). In the set cycle time, compressor output switches between “1” and “0”, so this compressor is called “Copeland Scroll Digital compressor”.

 According to the seasonal energy efficiency ratio (SEER), the Copeland Scroll Digital Compressor saves over at least 20% in energy compared with other fixed speed systems.