Features/Benefits (cont)
Variable speed capacity control elimi- nates slide valves, their associated loss- es, and their potential failure modes.
Component count (both rotating and total) has been minimized assuring maximum reliability under a wide range of operating conditions.
High efficiency
Per AHRI 550/590, chillers operate at design conditions less than one percent of the time. As a result, superior part load efficiency is required for today’s chilled water applications. The Ever- green® 23XRV screw chiller maximizes chiller efficiency by optimizing com- pressor operation. Electric power con- sumption drops dramatically when the motor speed slows. The 23XRV screw chiller delivers
Environmental leader
Carrier has long been committed to the environment and its sustainability. The Evergreen 23XRV screw chillers provide our customers with a high- efficiency,
Quality design
Positive displacement compres- sion — Positive displacement com- pression ensures stable operation under all load conditions without the
input power to the chiller be lost, the system design assures proper lubrica- tion of the bearings during coast down.
Small footprint — The Evergreen 23XRV chiller’s positive pressure design reduces the chiller size by up to 35% compared to
Constant or variable evaporator flow — The 23XRV chiller combines the advantages of positive displace- ment compression with variable speed capacity control. This process provides a chiller that reacts substantially better than chillers equipped with inlet guide vanes or slide valves. This allows for easier transition when bringing addi- tional chillers on line in multiple chiller plants and eliminates any possibility of surge, regardless of the changes in the system.
Low harmonic distortion — The Evergreen 23XRV chiller will generate less than 5% total harmonic distortion at the input to the VFD (variable frequency drive) without the use of any external filters or line reactors. This assures the VFD alone cannot exceed the
Low starting current (inrush) — The inrush current is limited to the chiller full load amps (rated load amperes). No other starting means can equal this level of starting current. The combination of low current and ultra low harmonics can reduce backup generator size requirements.
0.99power factor — The Ever- green 23XRV chiller can operate at up to 0.99 displacement power factor, which helps building owners avoid power factor penalties and decreases electrical losses in cables and trans- formers. High power factor may also reduce KVA requirements, saving elec- trical system costs on new projects or freeing up electrical resources on exist- ing systems operating near their maxi- mum capacity.
→Optional seismic kit — A seismic isolation package is available to meet International Building Code and ASCE 7 seismic qualification requirements in concurrence with ICC ES AC156 Ac- ceptance Criteria for Seismic Qualifica- tion by
Hermetic motor — The Evergreen 23XRV chiller utilizes motors that are hermetically sealed from the machine room. Cooling is accomplished by spraying liquid refrigerant on the motor windings. This highly efficient motor cooling method results in cooler- running motors than could be realized with
In addition, Carrier’s hermetic de- sign eliminates:
•Compressor shaft seals that require maintenance and increase the likeli- hood of refrigerant leaks.
possibility of compressor surge.
Superior oil management/cold condenser water operation — All Evergreen 23XRV chillers regulate oil temperature, viscosity and pressure. A patented process assures high quality oil is delivered to the compressor bear- ings by a positive displacement pump. Bearing lubrication is assured, allowing continuous operation with cold condenser water at all loads. Screw chillers no longer need to rely on dif- ferential system pressure to effectively lubricate the compressor. Should the
Table of contents
Page
Features/Benefits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5, 6
Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Typical Piping and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Control Wiring Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
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