Carrier EVERGREEN 23XRV User Manual download pdf (Page 2)

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

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

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.

0.99 power 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.

Features/Benefits (cont)

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

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