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 industry-leading inte- grated part load values (IPLV) in an ex- tremely broad range of applications and climates.
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, chlorine-free, long-term solution unaffected by refrigerant phase outs. Carrier’s decision to utilize non-ozone depleting HFC-134a refrig- erant provides our customers with a safe and environmentally sound product without compromising effi- ciency. In addition, HFC-134a was given an A1 safety rating by ASHRAE (American Society of Heating, Refrigerating and Air Conditioning Engineers), meaning that it is the safest refrigerant available.
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 negative-pressure designs. Extremely high compression efficiencies allow for compact, high-efficiency chillers that require less mechanical room floor space.
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 IEEE-519 standard for distortion at the point of common coupling. Ultra-low harmonics can eliminate the need for complicated harmonic system studies.
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.
Refrigerant-cooled VFD — Refrig- erant cooling of the VFD minimizes VFD size and ensures proper cooling of the transistors for extended life. Using R-134a refrigerant instead of water also eliminates costly mainte- nance associated with the water cool- ing pump, heat exchanger and rubber tubing used with water-cooled VFDs.
→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 Shake-Table Testing of Non- structural Components and Systems.
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 air-cooled designs of the same type.
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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Model Number Nomenclature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Physical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5, 6
Options and Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Performance Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Electrical Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11-14
Typical Piping and Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Control Wiring Schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Application Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17-23
Guide Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24-31
