Liebert Deluxe System/3 - DX

1.1.3 GLYCOOL (Chilled Glycol Cooling) SystemsIntroductionGLYCOOL systems have all of the features of a compressorized water or glycol system, plus a secondcooling coil that is connected into the water circuit. When fluid temperature is sufficiently low (belowroom temperature), cooling is provided by circulating the fluid through the second cooling coil (flow iscontrolled by a motorized valve.) This is then the primary cooling source, and it greatly reduces thecompressor operation.CoolingAt lower fluid temperatures, the second cooling coil acts as the main cooling system. The motorizedvalve opens proportionally to match the room load. At higher fluid temperatures, two or four stages ofmechanical refrigeration control the room load.HeatingThree stages of electric reheat are standard.HumidificationInfrared is standard; steam generating is optionalDehumidificationThese systems utilize the lag compressor.1.1.4 Dual Source Cooling SystemsThis system has all the features of a compressorized system but adds a second cooling coil that is connectedto a source of chilled water. This second coil is controlled by a modulating control valve. It isthe primary source of cooling and dehumidification so compressor operation is reduced.CoolingThe second coil acts as the primary cooling system. A modulating valve opens proportionally inresponse to the room load. Two and four stages of mechanical refrigeration as a secondary cooling systemat higher room loads.HeatingThree stages of electric reheat are standard.HumidificationInfrared is standard; steam generating is optionalDehumidificationThese systems utilize the chilled water valve, then the lag compressor if required by the load.2