Emerson ITR manual Water/Glycol Self-Contained Systems-Standard Features

Water/Glycol-Cooled Systems—Standard and Optional Features

8.0WATER/GLYCOL-COOLED SYSTEMS—STANDARD AND OPTIONAL FEATURES

8.1Water/Glycol Self-Contained Systems—Standard Features

Liquid-Cooled Condensers

A co-axial condenser provides ample capacity to handle the heat rejection needs of the system while using a minimum of liquid and low total pressure drop.

Regulating Valves

Head pressure operated regulating valves accurately control the condensing temperature and main- tain system capacity for various entering liquid flow rates and temperatures. Two-way valves with bypass are standard.

8.2Water/Glycol-Cooled, Self-Contained System—Optional Features

Three-way Regulating Valves

Three-way valves provide accurate control of condensing temperature and thus maintain constant system capacity while also keeping the condenser water flow rate constant.

High Pressure

The high pressure option for the condenser circuit consists of a regulating valve and a condenser rated at 350 psig (2413 kPa) water-pressure. This option is required in applications with large static head pressures.

Compressor Crankcase Heater

A compressor crankcase heater is available to prevent the migration of refrigerant to the compressor during off cycles.

Hot Gas Reheat

The hot gas reheat assembly consists of a three-way directional solenoid operated valve and a hot gas reclaim coil.

70/30 Cu-Ni Econ-O-Coil

This coil replaces the standard copper tube coil to provide improved resistance to corrosion. This option must be specified whenever a GLYCOOL or Dual Cooling Source system is applied to a cooling tower loop or other open water system.

8.3Water/Glycol Split System—Standard Features

Water/Glycol-Cooled Condensing Units

Factory charged and sealed, the water-cooled condensing unit is ready to be installed quickly and eas- ily. The counter-flow coaxial condenser with two-way or three-way regulating valve designed for 150 psi (1034.3 kPa) is matched to the heat rejection requirements of the compressor for a variety of flow rates and fluid temperatures.

Condensing unit has a hot gas bypass standard feature that bypasses hot gas around the compressor directly to the suction side of the compressor to provide capacity control and reduce compressor cycling. System includes liquid injection valve to maintain proper suction superheat.

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