In spring and at night, the refrigerated economizer can partially operate in free cooling, which reduces the energy consumption of the compressor. If the return air has a temperature of 30 ° C, when the temperature outside drops enough (18 ° C is shown in the example, but can be achieved with higher temperatures with smaller loads), the Liebert EconoPhase works in partial economization. In this mode, the refrigerant bypasses the first air conditioning compressor in the room. EconoPhase pump one is activated and consumes just 0.6 kW – a net saving of over 90% compared to running the compressor. This results in a pPUE of 1.17 or a SCOP of 5.8.