E
C
N V I R O N M E N T A L
Liebert
O N T R O L
®
Microprocessor
Control
Energy
Efficient
H IGHEST P RECISION AND
G REATEST E NERGY E FFICIENCY
I N A T RUE F OUR -S TEP D ESIGN
Humidity
Control
Deluxe System/3TM Four-Step
While precise environmental control
is a major requirement of critical
electronic systems, energy efficiency is
also a very important consideration.
The Liebert Deluxe System/3 is the
industry standard for both energy
efficiency and precision. The Four-Step
method of control achieves higher levels
of efficiency through an integration
of high efficiency compressors with
capacity control valves, an advanced
microprocessor control system, and a
computer-optimized cooling coil. This
integration ensures a more efficient use
of energy with a more precise control
of temperature and humidity.
In addition, the Four-Step cooling process
provides an opportunity to accomodate
future growth and equipment changes,
efficiently handling small loads now with
increased load capacity for the future.
Reliability is enhanced by fewer and less
stressful compressor starts for reduced wear.
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
ISO 9000
CERTIFIED
COMPANY
Environmental
Control
T HE F OUR -S TEP S YSTEM ...
..........
The Liebert Four-Step System is a
standard in environmental control
for sensitive electronics.
Liebert’s no-compromise approach
increases energy efficiency while
maintaining the reliability and
precision of the system. These
enhancements increase the
performance level of the system
and more closely track the cooling
load of your critical space.
.......
.......
HOW THE FOUR-STEP SYSTEM WORKS
THE FOUR-STEP SYSTEM USES
FOUR PRIMARY COMPONENTS
The Liebert Deluxe System/3 Four-Step system
achieves four steps of control through the use of two
compressors. Each compressor is equipped with an
additional capacity control valve for modulation. During
steps one and two, the compressors are energized in
the capacity controlled mode. While in step one,
cooling reaches a level of 38%, using only 25% of the
compressor’s energy input. Step two results in 76%
cooling, using only 50% of the energy. Steps three and
four then increase the first and second compressors to
full capacity, only when needed.
• High Energy Compressors. Liebert uses highefficiency semi-hermetic compressors, the standard in
the industry (average compressor EER = 11.69). These
highly reliable and energy efficient compressors are
an integral part of the Four-Step system.
• A-Frame Evaporator Coil. The Liebert
A-Frame coil, designed and manufactured by Liebert,
provides maximum performance and improved
dehumidification capabilities whether the
compressors are operating at full or reduced capacity.
• Capacity Control Valve. Each high efficiency
compressor is equipped with a capacity control valve
(CCV). The valves function to regulate compressor
capacity by isolating cylinders and providing
additional steps of control.
• Microprocessor Controls. The Deluxe System/3
Four-Step can be programmed to meet the specific
and precise needs of any critical space. The result is a
level of control previously unavailable in environmental control systems. In addition to local monitoring,
control, and alarm indicators, the microprocessor
communicates with the Liebert SiteScan monitoring
system as part of a total protection network. The
Advanced Microprocessor Control and Advanced
Microprocessor Control with Graphics are user-friendly
with menu-driven monitors/control panels.
2
P ERFORMANCE
S ECOND T O N ONE
ENERGY SAVINGS
100%
100%
88%
75%
76%
50%
.......
38%
ENERGY SAVINGS
The chart at the right shows the cooling performance of
the Four-Step system at each step of control. The area
between the dotted lines represents the heat load
typical electronic equipment produces. It is within this
area that Four-Step performance is optimal.
For example, in Step Two, for a 15-ton unit (both
compressors operating with the capacity control valve
activated), the Four-Step system produces 76% of the
total capacity using only 50% of the energy. Full
capacity is available when needed. But, during those
times when it is not, the Four-Step system provides a
major operating cost advantage.
To give you a more individualized analysis of your
operations and environmental needs, Liebert can provide a comprehensive, computerized energy analysis to
show you just how much you can save using the Liebert
Four-Step system.
.......
PRECISION
Because the Four-Step system modulates capacity in
four small steps, room temperature and humidity
control are maximized. The capacity control valves
enable the system to more closely track room load
changes for greater precision and less
humidity fluctuation.
25%
Step Four
Step Three
■ Capacity
■ Energy
Step Two
Step One
■ Energy Savings
.......
RELIABILITY
All Liebert systems are designed and built with the
highest quality components and engineering expertise.
This reputation for reliability is enhanced in the Liebert
Deluxe System/3 Four-Step in many ways: First,
compressors are always started with the control valve
activated, resulting in less wear and lower inrush power;
secondly, the greater control means less cycling and
extended service life. The semi-hermetic compressors
are highly efficient, and the draw-through air pattern
combined with a large face area evaporator coil results
in efficient air movement. Additional features that
increase value and reliability include stainless steel
fin-tube reheat and a multiple blower fan section. The
microprocessor control allows a sequenced start of all
components and reduced start of compressors.
Additional support is provided after hours, seven days
a week, by calling Liebert at 800-877-9222 if problems
should occur.
.......
AVAILABILITY
The Four-Step option is available in most
compressorized versions of Deluxe System/3. This
allows the use of this option in applications ranging
from air cooled through GLYCOOL-configurations.
Four-Step applications permit additional savings of
20-40% over standard Liebert systems and greater
savings when compared to comparative models.
3
Liebert
®
Keeping Business in Business
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
Total
DH/VH 114AU
DH/VH 125AU
DH/VH 199AU
DH/VH 245AU
DH/VH 290AU
DH/VH 380AU
114,200 (33.5)
125,500 (36.7)
178,000 (52.2)
227,300 (66.6)
259,300 (76.0)
353,400 (103.5)
312,600 (88.6)
90,200 (26.4)
111,900 (32.8)
163,600 (47.9)
201,200 (59.0)
229,700 (67.3)
WATER COOLED
Sensible
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)
315,000 (92.3)
93,500 (27.4)
166,300 (34.1)
171,500 (50.2)
209,300 (61.3)
240,700 (70.5
GLYCOL COOLED
Sensible
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
Total
DH/VH 115AU
DH/VH 130AU
DH/VH 199AU
DH/VH 245AU
DH/VH 290AU
DH/VH 380AU
29.8 (101,600)
37.0 (126,300)
47.0 (160,200)
59.7 (203,800)
68.1 (232,200)
91.2 (311,300)
83.9 (286,100)
24.9 (85,100)
32.9 (112,200)
47.0 (160,200)
59.7 (203,800)
68.1 (232,200)
WATER COOLED
Sensible
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)
87.0 (296,700)
25.7 (87,800)
34.4 (117,300)
47.4 (161,600)
57.8 (197,300)
66.5 (227,000)
GLYCOL COOLED
Sensible
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)
..........
1050 DEARBORN DRIVE
P.O. BOX 29186
COLUMBUS, OHIO 43229
800.877.9222 PHONE (U.S. & CANADA ONLY)
614.888.0246 PHONE (OUTSIDE U.S.)
614.841.6022 FAX
upstech@liebert.com EMAIL
Via Leonardo Da Vinci 8
Zona Industriale Tognana
35028 Piove Di Sacco
Italy
39 049 9719 111 Phone
39 049 5841 257 FAX
23/F, Allied Kajima Bldg.
138 Gloucester Road
Wanchai
Hong Kong
852 2 572 2201 Phone
852 2 831 0114 FAX
..........
LIEBERT WEB SITE
http://www.liebert.com
EQUIPMENT SELECTION GUIDE
30
22
UNIT SIZE (TONS)
LIEBERT CORPORATION
DH/DE = Downflow System, VH/VE = Upflow System
20
15
10
8
40
80
120
160
HEAT LOAD (BTU
200
X
240
280
320
1,000)
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.
While every precaution has been taken to ensure accuracy and completeness in this literature, Liebert Corporation assumes no
responsibility, 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