Introduction
1.0INTRODUCTION
1.1System Descriptions
The Liebert Challenger 3000™ and Liebert Challenger ITR™ Precision Cooling systems are available in several configurations.
1.1.1Compressorized Systems
NOTE
Compressorized systems may be a self-contained system, with the compressor in the Liebert Challenger 3000/Liebert Challenger ITR unit, or a split system, with the compressor in a separate condensing unit.
These systems may be air, water, or glycol cooled, depending on the heat rejection method selected. Cooling—One stage standard; variable capacity with digital scroll, optional.
Heating—Two stages of electric reheat standard; SCR controlled electric reheat, hot water reheat, hot gas reheat on water and glycol cooled systems optional.
Humidification—Infrared standard; steam generating optional. Dehumidification—Hot gas bypass locked out standard
1.1.2GLYCOOL™ (Chilled Glycol Cooling) Systems
GLYCOOL systems have all of the features of a compressorized water or glycol system, plus a second cooling coil that is connected into the water circuit. When fluid temperature is sufficiently low (below room temperature), cooling is provided by circulating the fluid through the second cooling coil (flow is controlled by a motorized valve.) This is then the primary cooling source, and it greatly reduces the compressor operation.
Cooling—Modulated cooling valve opens proportionally to match room needs (primary), one or two stages of mechanical refrigeration (secondary)
Heating—Two stages of electric reheat standard; hot water reheat optional Humidification—Infrared standard; steam generating optional Dehumidification—Hot gas bypass locked out standard
1.1.3Chilled Water Systems
These systems utilize a central chiller and control cooling by modulating a control valve in the chilled water line.
Cooling—Proportional in response to room needs
Heating—Two stages of electric reheat standard; hot water reheat optional Humidification—Infrared standard; steam generating optional Dehumidification—Chilled water valve opens proportionally in response to room needs
