Emerson 3000/ITR Manuel D’Utilisation

The Liebert Challenger 3000

™

 and Liebert Challenger ITR

™

 Precision Cooling systems are available 

in several configurations.

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

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

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

NOTE
Compressorized systems may be a self-contained system, with the compressor in the Liebert