The Liebert DSE free cooling system is a pumped refrigerant economization system for data centers that can provide free cooling throughout much of the year in most locations. The unit goes into economization mode automatically when conditions are met. It can turn off one or both of its compressors and instead engage the refrigerant pump, which uses 5% of the energy used by the compressors.
LIEBERT DSE COOLING SYSTEM by VERTIV. www.vertivco.com