Emerson ITR Manuel D’Utilisation

Two versions are available:

• Self-Contained Systems
• Split Systems

These systems feature a scroll compressor and controls, expansion valve, hot gas bypass and evapora-

tor coil in the room unit.
Air-Cooled models also include a crankcase heater on the compressor and require field connection to 

remote air-cooled condenser.
Water, Glycol and GLYCOOL models also include a coaxial condenser with field connections 

required to the water or glycol coolant loop.
Water/Glycol models have two-way WRV with bypass.
GLYCOOL models have three-way WRV.

These systems feature the evaporator coil and expansion valve in the room unit, with the scroll com-

pressor, and the condensing equipment located in one of several different types of pre-charged con-

densing units.

The heart of the refrigeration system is the compressor.
All self-contained evaporator units and split system condensing units contain a high efficiency, quiet 

operating scroll compressor. The compressors have internal vibration isolating mountings, pressure 

safety controls and built-in overload protection.

The evaporator coil is designed for the high sensible heat ratio required by electronic equipment 

applications. The copper tube, aluminum fin coils are configured in a V-frame for smooth air flow 

through the unit.

Every Liebert Challenger compressor has a high-pressure switch with an exclusive manual reset after 

high pressure cut-out. This prevents cycling the compressor at high pressure, resulting in greater effi-

ciency and longer compressor life.

The externally equalized thermostatic expansion valve smoothly controls the flow of refrigerant 

through the coil and provides precise control of superheat.