Emerson Liebert Challenger ITR - Manual (Page 21)

Water/Glycol-Cooled Systems—Standard and Optional Features
13
8.0 W
ATER
/G
LYCOL
-C
OOLED
S
YSTEMS
—S
TANDARD AND
O
PTIONAL
F
EATURES
8.1 Water/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.
8.2 Water/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.
8.3 Water/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.