Introduction
Liebert® Challenger 3000™4
1.0 INTRODUCTION

1.1 System Descriptions

Liebert Challenger 3000 Precision Cooling systems are available in three main system configurations:
• self-contained system with a scroll compressor in the room unit
• self-contained chilled water system
• split system with an evaporator section and a remote condensing unit
All three types are available in upflow or downflow configurations. The standard upflow configuration
is front return. All models require three-phase power. Units are available in 208, 230, 460, or 575V,
60Hz; and 200, 230 or 380/415V, 50Hz.
The following features are included as standard in all room units regardless of the type of system:
Liebert iCOM® control, A-frame coil (V-frame on upflows), infrared humidifier, finned tubular
stainless steel electric reheat, 2" filter, individual high voltage fused protection and fan assembly.

1.1.1 Self-Contained Systems

Air-Cooled Models

Complete refrigeration system including hot gas bypass and crankcase heater with standard scroll
compressor, standard condenser and fan speed control for 95°F (35°C) ambient at sea level. Optional
Digital scroll compressor with unloading solenoid valve is also available. Digital scroll compressor
systems do not include hot gas bypass.

Water-Cooled Models

Compete refrigeration system including hot gas bypass with standard scroll compressor, water/glycol-
cooled condenser and two-way water regulating valve with bypass. Optional digital scroll compressor
with unloading solenoid valve is also available. Digital scroll compressor systems use a 2-way
motorized ball valve in lieu of the regulating valve; they do not include hot gas bypass.

Glycol-Cooled Models

The water-cooled model as described above plus pump package and 95°F (35°C) design ambient
drycooler.

GLYCOOL Models (5-Ton Only)

Complete refrigeration system including hot gas bypass with standard scroll compressor, glycol
condenser and three-way water regulating valve plus an integrally piped Econ-O-Coil with three-way
modulating control valve. Optional digital scroll compressor with unloading solenoid valve is also
available. Digital scroll compressor systems use a 3-way motorized ball valve in lieu of the regulating
valve; they do not include hot gas bypass.

1.1.2 Chilled Water Models

Chilled Water models include chilled water piping, three-way modulating valve, and actuator
assembly.