Emerson ITR manual Self-Contained Systems, Split Systems

Refrigeration Systems

6.0REFRIGERATION SYSTEMS

Two versions are available:

•Self-Contained Systems

•Split Systems

6.1Self-Contained Systems

These systems feature a scroll compressor and controls, expansion valve, hot gas bypass and evapora- tor coil in the room unit.

Air-Cooledmodels 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.

6.2Split Systems

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.

6.3Refrigeration System Components—Standard Features

6.3.1Compressor

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.

6.3.2Evaporator Coil

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.

6.3.3Safety Control

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.

6.3.4Expansion Valve

The externally equalized thermostatic expansion valve smoothly controls the flow of refrigerant through the coil and provides precise control of superheat.

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