MicroprocessorControl

EnergyEfficient

HumidityControl

E N V I R O N M E N T A L C O N T R O L

HIGHEST PRECISION AND

GREATEST ENERGY EFFICIENCY

IN A TRUE FOUR-STEP DESIGN

Deluxe System/3TM Four-Step

THE LIEBERT DELUXE SYSTEM/3 FOUR-STEP ENVIRONMENTAL CONTROL UNIT IS DESIGNED

TO MATCH THE COOLING NEEDS OF YOUR SENSITIVE ELECTRONICS, INCLUDING • DATA PROCESSING

• TELECOMMUNICATIONS • INDUSTRIAL PROCESSES • MEDICAL LABORATORIES

• RAISED FLOOR OR DUCTED APPLICATIONS REQUIRING PRECISE TEMPERATURE AND

HUMIDITY CONTROL

While precise environmental controlis a major requirement of criticalelectronic systems, energy efficiency isalso a very important consideration.

The Liebert Deluxe System/3 is theindustry standard for both energyefficiency and precision. The Four-Stepmethod of control achieves higher levelsof efficiency through an integrationof high efficiency compressors withcapacity control valves, an advancedmicroprocessor control system, and acomputer-optimized cooling coil. Thisintegration ensures a more efficient useof energy with a more precise controlof temperature and humidity.

In addition, the Four-Step cooling processprovides an opportunity to accomodatefuture growth and equipment changes,efficiently handling small loads now withincreased load capacity for the future.Reliability is enhanced by fewer and lessstressful compressor starts for reduced wear.

Liebert ®

ISO 9000CERTIFIEDCOMPANY

THE FOUR-STEP SYSTEM USES

FOUR PRIMARY COMPONENTS

• High Energy Compressors. Liebert uses high-efficiency semi-hermetic compressors, the standard inthe industry (average compressor EER = 11.69). Thesehighly reliable and energy efficient compressors arean integral part of the Four-Step system.

• A-Frame Evaporator Coil. The LiebertA-Frame coil, designed and manufactured by Liebert,provides maximum performance and improveddehumidification capabilities whether thecompressors are operating at full or reduced capacity.

• Capacity Control Valve. Each high efficiencycompressor is equipped with a capacity control valve(CCV). The valves function to regulate compressorcapacity by isolating cylinders and providingadditional steps of control.

• Microprocessor Controls. The Deluxe System/3Four-Step can be programmed to meet the specificand precise needs of any critical space. The result is alevel of control previously unavailable in environmen-tal control systems. In addition to local monitoring,control, and alarm indicators, the microprocessorcommunicates with the Liebert SiteScan monitoringsystem as part of a total protection network. TheAdvanced Microprocessor Control and AdvancedMicroprocessor Control with Graphics are user-friendlywith menu-driven monitors/control panels.

2

EnvironmentalControl

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THE FOUR-STEP SYSTEM...

The Liebert Four-Step System is astandard in environmental controlfor sensitive electronics.

Liebert’s no-compromise approachincreases energy efficiency whilemaintaining the reliability andprecision of the system. Theseenhancements increase theperformance level of the systemand more closely track the coolingload of your critical space.

HOW THE FOUR-STEP SYSTEM WORKS

The Liebert Deluxe System/3 Four-Step systemachieves four steps of control through the use of twocompressors. Each compressor is equipped with anadditional capacity control valve for modulation. Duringsteps one and two, the compressors are energized inthe capacity controlled mode. While in step one,cooling reaches a level of 38%, using only 25% of thecompressor’s energy input. Step two results in 76%cooling, using only 50% of the energy. Steps three andfour then increase the first and second compressors tofull capacity, only when needed.

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RELIABILITY

All Liebert systems are designed and built with thehighest quality components and engineering expertise.This reputation for reliability is enhanced in the LiebertDeluxe System/3 Four-Step in many ways: First,compressors are always started with the control valveactivated, resulting in less wear and lower inrush power;secondly, the greater control means less cycling andextended service life. The semi-hermetic compressorsare highly efficient, and the draw-through air patterncombined with a large face area evaporator coil resultsin efficient air movement. Additional features thatincrease value and reliability include stainless steelfin-tube reheat and a multiple blower fan section. Themicroprocessor control allows a sequenced start of allcomponents and reduced start of compressors.

Additional support is provided after hours, seven daysa week, by calling Liebert at 800-877-9222 if problemsshould occur.

AVAILABILITY

The Four-Step option is available in mostcompressorized versions of Deluxe System/3. Thisallows the use of this option in applications rangingfrom air cooled through GLYCOOL-configurations.Four-Step applications permit additional savings of20-40% over standard Liebert systems and greatersavings when compared to comparative models.

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ENERGY SAVINGS

The chart at the right shows the cooling performance ofthe Four-Step system at each step of control. The areabetween the dotted lines represents the heat loadtypical electronic equipment produces. It is within thisarea that Four-Step performance is optimal.

For example, in Step Two, for a 15-ton unit (bothcompressors operating with the capacity control valveactivated), the Four-Step system produces 76% of thetotal capacity using only 50% of the energy. Fullcapacity is available when needed. But, during thosetimes when it is not, the Four-Step system provides amajor operating cost advantage.

To give you a more individualized analysis of youroperations and environmental needs, Liebert can pro-vide a comprehensive, computerized energy analysis toshow you just how much you can save using the LiebertFour-Step system.

PRECISION

Because the Four-Step system modulates capacity infour small steps, room temperature and humiditycontrol are maximized. The capacity control valvesenable the system to more closely track room loadchanges for greater precision and lesshumidity fluctuation.

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PERFORMANCE

SECOND TO NONE

. . . . . . .

. . . . . . .

3

38%

25%

50%

76%

88%

100% 100%

75%

Step Four Step Three Step Two Step One

� Capacity � Energy � Energy Savings

ENERGY SAVINGS

L I E B E R T C O R P O R A T I O N

1050 DEARBORN DRIVE

P.O. BOX 29186COLUMBUS, OHIO 43229800.877.9222 PHONE (U.S. & CANADA ONLY)614.888.0246 PHONE (OUTSIDE U.S.)614.841.6022 FAXupstech@liebert.com EMAIL

Via Leonardo Da Vinci 8Zona Industriale Tognana35028 Piove Di SaccoItaly39 049 9719 111 Phone39 049 5841 257 FAX

23/F, Allied Kajima Bldg.138 Gloucester RoadWanchaiHong Kong852 2 572 2201 Phone852 2 831 0114 FAX

L I E B E R T W E B S I T E

http://www.liebert.com

30

22

20

15

10

8

EQUIPMENT SELECTION GUIDE

40 80 120 160 200 240 280 320

HEAT LOAD (BTU X 1,000)

UN

ITSI

ZE

(TO

NS)

Operating Range

Peak Efficiency

NOTES:

1) Equipment Selection Guide is based on 60 Hz air-cooled capacities at 75°F/50% RH. Other models or conditions will vary slightly.

2) For a comprehensive analysis of size or model efficiencies to aid in correct equipment selection,contact your local Liebert representative or call 800.877.9222.

K e e p i n g B u s i n e s s i n B u s i n e s sLiebert ®

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While every precaution has been taken to ensure accuracy and completeness in this literature, Liebert Corporation assumes noresponsibility, and disclaims all liability for damages resulting from use of this information or for any errors or omissions.

© 1998 Liebert Corporation. All rights reserved throughout the world. Specifications subject to change without notice.

All names referred to are trademarks or registered trademarks of their respective owners.

® Liebert and the Liebert logo are registered trademarks of the Liebert Corporation.

® Keeping Business in Business is a registered trademark of the Liebert Corporation.

SL-18030 (R 6/01) Printed in USA

Deluxe System/3®-Four Step Capacity Data—60 Hz

8 Ton 10 Ton 15 Ton 20 Ton 22 Ton 30Ton

Capacity Data BTU/HR (kW) 75°F DB, 62.5°F WB (23.9°C DB, 16.9°C WB) 50% RH

AIR COOLED DH/VH 114AU DH/VH 125AU DH/VH 199AU DH/VH 245AU DH/VH 290AU DH/VH 380AU

Total 114,200 (33.5) 125,500 (36.7) 178,000 (52.2) 227,300 (66.6) 259,300 (76.0) 353,400 (103.5)

Sensible 90,200 (26.4) 111,900 (32.8) 163,600 (47.9) 201,200 (59.0) 229,700 (67.3) 312,600 (88.6)

WATER COOLED DH/VH 127WU DH/VH 138WU DH/VH 219WU DH/VH 267WU DH/VH 315WU DH/VH 412WU

Total 122,300 (35.8) 136,500 (40.0) 197,900 (58.0) 247,700 (72.6) 286,900 (84.1) 384,200 (112.6)

Sensible 93,500 (27.4) 166,300 (34.1) 171,500 (50.2) 209,300 (61.3) 240,700 (70.5 315,000 (92.3)

GLYCOL COOLED DH/VH 110GU DH/VH 116GU DH/VH 192GU DH/VH 240GU DH/VH 265GU DH/VH 363GU

Total 103,900 (30.4) 114,400 (33.5) 172,200 (50.4) 216,100 (63.3) 250,100 (73.2) 341,100 (99.9)

Sensible 86,100 (25.2) 107,500 (31.4) 161,300 (47.2) 196,700 (57.6) 226,100 (66.2) 297,800 (87.3)

GLYCOOL SYSTEMS DE/VE 110GU DE/VE 116GU DE/VE 192GU DE/VE 240GU — DE/VE 363GU

Total 103,900 (30.4) 114,400 (33.5) 172,200 (50.4) 216,100 (63.3) — 338,300 (96.8)

Sensible 86,100 (25.2) 107,500 (31.4) 161,300 (47.2) 196,700 (57.6) — 288,400 (84.5)

Deluxe System/3®-Four Step Capacity Data—50 Hz

Capacity Data BTU/HR (kW) 75°F DB, 62.5°F WB (23.9°C DB, 16.9°C WB) 50% RH

AIR COOLED DH/VH 115AU DH/VH 130AU DH/VH 199AU DH/VH 245AU DH/VH 290AU DH/VH 380AU

Total 29.8 (101,600) 37.0 (126,300) 47.0 (160,200) 59.7 (203,800) 68.1 (232,200) 91.2 (311,300)

Sensible 24.9 (85,100) 32.9 (112,200) 47.0 (160,200) 59.7 (203,800) 68.1 (232,200) 83.9 (286,100)

WATER COOLED DH/VH 128WU DH/VH 143WU DH/VH 219WU DH/VH 267WU DH/VH 315WU DH/VH 412WU

Total 31.7 (108,200) 40.7 (138,900) 50.7 (172,900) 63.7 (217,500) 74.0 (252,500) 99.1 (338,200)

Sensible 25.7 (87,800) 34.4 (117,300) 47.4 (161,600) 57.8 (197,300) 66.5 (227,000) 87.0 (296,700)

GLYCOL COOLED DH/VH 111GU DH/VH 121GU DH/VH 192GU DH/VH 240GU DH/VH 265GU DH/VH 363GU

Total 27.8 (94,800) 34.4 (117,400) 45.7 (155,800) 57.1 (194,900) 66.1 (225,500) 88.3 (301,100)

Sensible 24.2 (82,500) 31.9 (108,700) 45.7 (155,800) 57.1 (194,900) 66.1 (225,500) 82.7 (282,100)

GLYCOOL SYSTEMS DE/VE 111GU DE/VE 121GU DE/VE 192GU DE/VE 240GU — DE/VE 363GU

Total 27.8 (94,800) 34.4 (117,400) 45.7 (155,800) 57.1 (194,900) — 88.3 (301,100)

Sensible 24.2 (82,500) 31.9 (108,700) 45.7 (155,800) 57.1 (194,900) — 82.7 (282,100)

DH/DE = Downflow System, VH/VE = Upflow System