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We Invented Precision Cooling
Emerson Network Power knows precision cooling. After all, we invented it back in 1965!
Over the years, our cooling systems have been proven as the world’s standard for reliable
operation. In fact, there are Liebert precision cooling systems in the field that have been
in constant use for over 30 years. Installed in thousands of critical data centers around
the world, our latest precision cooling portfolio offers the highest efficiency without
compromising reliability.
Understanding the 3 R’s of Precision Cooling
Despite the claims of different vendors promoting their own, specialized solutions, there is no silver bullet when it comes
to precision cooling for every application. There is only the most appropriate cooling solution for your infrastructure, and
an understanding of each cooling design can help determine which cooling approach and solution can best meet your
business goals and infrastructure requirements.
Room Cooling
While densities are climbing steadily, standard density facilities remain the norm. Traditional
room cooling uses precision air conditioners and is the most appropriate solution for these
standard density environments. The standard complexity, ease of deployment and precision
humidity and filtration control of these systems has seen hundreds of thousands of units
deployed in critical facilities across Asia, with more added every day. Combined with a raised
floor, precision air conditioners deliver the best value for money and represents significant
increased efficiency over building or comfort cooling.
Row Cooling
If energy efficiency is top concern, row cooling can improve efficiency over the standard room
approach by more than 30 percent. It supports high density applications by the utilization
of cold aisle containment. Row cooling with SmartAisle™ can further improve efficiency and
provide uniform and predictable temperature and humidity control to equipment with or
without raised floor.
Rack Cooling
One of the proven best-practice approaches to dealing high density heat issues is by bringing
cooling technologies closer to the source of heat. Specialized precision cooling solutions
for racks can support ultra-high-density applications, up to and above 30kW per rack. This
dedicated cooling approach specifically cools a rack by providing the best direct air flow intake
of the critical equipment.
What’s Inside
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Emerson Invented Precision Cooling
What’s Inside
Introducing Liebert PEX
Why Precision Cooling?
Room Cooling Attributes
Improved Energy Efficiency
Ensuring Availability
Designed for Density
Cooling Types
Features Summary
Technical Specifications
Service Commitment
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Liebert PEX
The Liebert PEX: More Than A Single Energy Efficient component
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The efficiency of the Liebert PEX is engineered into the product. Each component that goes into the Liebert PEX is
carefully tested to ensure that it will contribute to its overall efficiency.
All enchancements to energy efficiency are designed to reduce operating time and cycling of key components and
increase reliability.
In addition to having components that are individually engineered to provide the best efficiency, how these
components work and interact with each other also contribute to the energy savings you get with the Liebert PEX.
The EC fan technology regulates airflow and reduces the fan
input power. In-floor configuration further reduces energy
consumption in downflow units. This significantly reduces
energy consumption and provides longer component life.
Managed through Liebert iCOM controls, EC fans deliver
airflow for the optimal operating conditions for IT equipment.
Liebert PEX with Digital Scroll Technology is highly reliable
and is designed to achieve efficiency with flexibility and
to lower TCO. The use of digital scroll technology actively
manages capacity modulation from 20 percent to 100
percent. During the loaded state, cooling units consume full
load power. On the other hand, during the unloaded state,
the units run freely, consuming only about 10 percent of the
full load.
The teamwork mode in the iCOM Controller, a key feature
of the Liebert PEX, ensures efficiency by allowing multiple
units to work together as a single system to optimize room
performance.
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The Infrared Humidifier has been a feature on Liebert
environmental control systems for over 45 years. Its rapid
response and the ability to handle varying water conditions
has made it an industry standard in applications that demand
precise, particle-free humidity control.
Utilising this option a Liebert PEX provides a second coil
that utilises the central building Chiller system water supply.
The unit can function either as a DX (compressorized) or a
Chilled water system. During times when the chiller supply is
available compressorized operation is eliminated, reducing
energy costs. In addition this option can provide increased
redundancy and flexibility to the environmental control
system.
Optional GLYCOOL free-cooling system permits
compressorless operation in colder ambient conditions.
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Why Precision Cooling?
Traditional approaches to cooling are only effective and efficient to a point. Unfortunately, a number of IT organizations
still rely on commercial air conditioners to cool their critical facilities. Commercial air conditioning, known for its low
upfront costs, is both ineffective and problematic. It does not address the needs of sensitive electronics such as year-round
cooling, humidity & temperature control and air filtration, which makes Precision Cooling the only real solution for these
applications.
Comfort Cooling vs. Precision Cooling
Comfort Air
Using rigid, overhead ducts
provides insufficient air volume
(30-40 l/s per kW) which
results in hot spots. They are
also difficult to relocate.
Minimal air filtration
is typically provided
with comfort systems.
Comfort systems can over-dry
room air because of their
lower Sensible Heat Ratio.
They typically do not provide
integral humidity control.
Using separate humidification
systems, not controlled by
the cooling system, can
waste energy and reduce the
stability of the environment.
Comfort cooling systems are not designed for continuous operations. These systems lack the scalability, adaptability
and precision required to effectively cool the server racks being deployed today.
Precision Cooling Air
Precision cooling provides a cost-effective, energyefficient solution to the requirements of today’s
sensitive electronics, while enabling the flexibility
to adapt to whatever the future brings.
Why run the risk of relying on building air?
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RISK: These systems shutdown over night & weekends
RISK: Systems designed to operate 5 x 8 vs. Continuous Operation.
RISK: Do not provide sufficient filtration for IT equipment and no humidity control
RISK: Building air removes too much moisture, introducing the risk of static discharge
RISK: Insufficient airflow causes overheating in IT equipment (Airflow designed for comfort not
correct delivery for IT)
COST:
- Building air is designed to cool people (heat and sweat)
- As a consequence a lot of energy (cost) goes into removing that moisture
- This energy is wasted where building air is used to cool machines
* SMB study June 2008
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Room Cooling Attributes
Communications
and Monitoring
Energy Efficiency
System Supervision
and Management
Multiple
Configurations
Space Savings
When to Select Room Cooling
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Standard / Medium / High density environments
y in room / raised floor
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Open architecture
y Delivers filtration and humidity control
y Thermal Mass minimizes risk of thermal runaway
y Low complexity / ease of deployment
y Broad capacity range
y Redundancy / load sharing
y Widest choice of cooling mediums
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Suitable for Mega Data Centers
y For affordable and realistic redundancy
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Proven and time tested
y Over 200,000 units deployed in Asia
Liebert PEX: Energy Efficient Room
Cooling Solution
Liebert PEX is the most accessible for the broadest
range of business needs. It represents a straight
forward and effective solution to the majority of low
to medium density applications. It reliably services
the thermal requirements of a critical data center. The
solution requires nothing more than direct front access
for installation and routine servicing. This means that
users can achieve 100% space utilization around the
unit and not suffer dead space caused by service access
requirements on the sides and rear.
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Improved Energy Efficiency
EC Fan
The innovative energy efficient EC fan technology integrated with continuous speed
control across the full operating range provides greatest value to the end user. The
technology offers a simple and cost effective way of introducing energy efficient
technology into the Liebert PEX. EC fan technology regulates airflow and reduces the
fan input power. This significantly reduces energy consumption and provides longer
component life. Managed through Liebert iCOM controls, EC fans deliver airflow for the
optimal operating conditions for IT equipment.
Features and Benefits
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10-30% less energy than average standard AC motor
Backward curved, corrosion resistant aluminum fan impeller
Electronically commutated motor, AC to DC conversion
Direct driven with integrated electronics
True soft start with inrush current lower than full load current
Liebert PEX Down Flow Unit
Down Flow EC Fan Assembly
Up Flow EC Fan Assembly
Merging Cooling Technologies
The Liebert PEX becomes the ultimate solution by combing the most reliable cooling technologies in the industry
- The EC fan and Digital Scroll (DS) compressor technology. EC fan plays an integral role in the Liebert PEX by providing
effective capacity control while retaining high energy efficiency and low noise levels. The DS compressor technology in
the Liebert PEX enables superior room condition, humidity and temperature control by adapting to changing sensible
heat load and latent conditions.
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Digital Scroll
Liebert PEX with Digital Scroll technology is highly reliable and is designed to achieve efficiency with flexibility and to lower
TCO. Emerson Precision Cooling units with Digital Scroll technology actively manage achieving capacity modulation from
20 percent to 100 percent. During the loaded state, cooling units consume full load power. On the other hand, during the
unloaded state, the units run freely, consuming down to about 10 percent of the full load. Scalable, the Liebert Digital Scroll
automatically adjusts to yearly increases in heat load. It is available on air cooled, water cooled, glycol cooled, dual cool and
free cool models.
Single compressor models utilize Digital Scroll compressor while dual compressor models utilize two Digital Scroll
compressors to provide the maximum energy benefit at part loads and system cooling and dehumidification cycles.
Features and Benefits
Emerson
Digital Scroll
Compressor
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Up to 30% less energy
Variable capacity compressor can improve efficiency at
less than peak capacity / on part load condition
More precise control of the environment
Save power at reduced duty (lower loads)
Fast regulation to rapidly changing loads
Powered by 50/60 Hz AC without frequency converter
Lower EMC compared to variable frequency drives
Digital Scroll Compressor Liebert PEX Up Flow Model
Managed by the iCOM control system, the combination of these technologies not only provides precise temperature
control but also provides relative humidity control without initially resorting to dehumidifying or humidifying. It helps
lower operating costs and reduces energy consumption by as much as 30 percent, compared to standard cooling
solutions.
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Ensuring Availability
Proactive Control and Monitoring of Critical Systems
High-Level Supervision to Multiple Units with the Liebert iCOM Control System
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The Liebert iCOM control system featured on the Liebert
PEX brings high-level supervision to multiple units
allowing them to work together as a single system to
optimize room performance.
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The optional Large Graphic Display features a 320x240 dot
matrix backlit screen with helpful system and maintenance
views. It allows you to see the average operation of the
“system” or all units that are working together in Unit to
Unit (U2U) Communication mode for Teamwork or Lead/
Lag from a centralized location.
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For customers who require extensive management of critical
system equipment that may span multiple locations in an evermoving global enterprise, Liebert SiteScan® Web will centrally
manage your critical equipment and give you the power to
move beyond the event-responsive service paradigm.
SiteScan Web does it all
Real-Time Monitoring and Control
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Event Management and Reporting
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Data Analysis and Trending
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Building Management Integration
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Liebert SiteScan® Web is a comprehensive critical systems
management solution dedicated to ensuring reliability through
graphics, event management and data extrapolation. The
standard Web interface allows users easy access from anywhere
at anytime.
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Enterprise Management with
Liebert SiteScan® Web Software
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Single and multi-site applications
Event management and unit control
Trend and historical data captures and reporting
Full ASHRAE BACnet compatibility
Java based
Windows 2000, XP and 2003 compatible
Adaptive Monitoring:
Increase Availability and Reduce
Support Costs
Adaptive monitoring technologies allow easy information
maneuverability to key resources, whether you need to integrate
critical system data with your Network Management System,
Building Management System or enable a Web browser interface.
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Liebert’s monitoring technology puts critical systems information at
the fingertips of support personal - wherever they are - addressing
the increasing concern for improved internal communication
between management groups surrounding a data center.
Designed for Density
Up Flow
Designed for in-room or ducted applications
Cooling
Options
Available
on Your
Liebert PEX
Configure
The Liebert PEX
to meet your
specific needs
Down Flow
Designed for raised floor applications
9
Cooling Types
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10
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Features Summary
Energy Efficiency
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Infrared Humidifier for precise humidity control
iCOM controller for optimized room performance
Combined technologies of EC Fan and Digital Scroll Compressor yield higher level
of efficiency
EC Fan with infloor configuration
Efficient dehumidification cycle
Space Savings
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15% more kW per square meter compared to industry average
Requires nothing more than direct front access
Downflow EC fans serviceable from above floor without disturbing the raised
floor
Units can be dismantled and reassembled for difficult site jobs
Communications and Monitoring
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Teamwork Mode allows units to work together in rooms with unbalanced loads
Spare parts list allows speedy indentification of parts
Unit diary shares history with any authorized users or service contacts
System Supervision and Management
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Enhanced remote communications and control with Liebert Intellislot card
Centralized Management with Liebert Nforms software
Enterprise Management with Liebert SiteScan Web Software
Multiple Configurations
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Twelve different configurations for Upflow and Downflow units
Configure for your specific needs
Dual Cool
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Second coil that utilises the central building Chiller system water supply
Unit can function either as a DX (compressorized) or a Chilled water system
Reduces energy cost
Increases redundancy and flexibility to the environmental control system
Free Cool
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Glycol Free Cool System
Unit can function as a DX (compressors), or Free Cool or mixed for energy savings
Reduces energy costs in colder climates
Technical Specifications
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13
Technical Specifications
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14
Service Commitment
A Heritage Of Reliability and Service Commitment
Emerson Network Power Invented Precision Air
Conditioning With The First Liebert Systems
No one knows more about precision cooling than Emerson
Network Power . After all, we invented it with our Liebert line
back in 1965.
Our mission critical cooling technology has been proven in
thousands of critical data centers around the world. In fact,
there are Liebert mission-critical air conditioning systems in
the field that have been in constant use for over 45 years, 24
hours a day!
The Global Standard For Reliability
These products are recognized as the world’s standard for
reliable operation. 100% of the Fortune 100 companies rely
on our solutions to protect their critical networks. We have
had experience in designing for an incomparable variety of
applications all over the world.
Our Expertise in Precision Air
Conditioning Sets Us Apart.
Our Global Services Give You That
Added Peace of Mind
Emerson Network Power Services
delivers unmatched 24 x 7 x 365
support and service before, during
and after installation. If you’re an
Emerson Network Power customer,
you’re a customer for life.
Over 140 Service Centers
Over 2000 Service Field Engineers
Over 570 Technical Support Staff
WORLDWIDE
Emerson Network Power Services
1
2
3
Truly Global
You can be sure that the only people who deal with your
Critical Precision Air Equipment will be 100% Factory Trained
Emerson Service Experts.
You can be sure that the parts you will receive from our 100%
Emerson Service Experts are 100% Original Parts. With our
Multi tiered parts availability program, you are ensured that
parts will be made available to you when and where you need
them.
4
5
We not only help you develop you Environmental Control
System, but our 100% Emerson Service Experts also offer a
Full Support Network so that your critical systems have a full
safety net every step of the way.
You don’t just get prompt service; you also get 100% Quality
Response. This means no useless tinkering, no wasted time-just Quality Service, straight away.
You are assured of 100% Version Control so that you critical
business systems won’t have to experience downtime due to
incompatibility.
15
EMERSON NETWORK POWER ASIA
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[email protected]
Emerson Network Power.
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