Emerson Liebert Ds Precision Cooling System 28 105Kw Brochures And Data Sheets SL 18810 R08 14

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Liebert® DS™
Designed To A Higher Standard Of Performance And Reliability

Emerson Network Power Understands The Need For
Precision And Reliability...
And Why This Is So Important To You
For sensitive electronics, environmental
control is more than simple cooling.
“Comfort” air conditioning systems are
designed to cool people and office space.
They simply cannot provide the kind of
environment required by high performance
computer or communication equipment.

Liebert DS Is Ideally Suited For:
Data Centers
Telecom/CATV
Computer Rooms

Labs And Testing

Network Operations
Centers

Production Facilities

Why You Can’t Take Chances When
Cooling Your Critical Space
Standard building cooling systems are designed
to keep people comfortable 8-12 hours each
day from spring to autumn with no provision
for winter operation. A precision cooling system
is designed to operate over a wide range of
ambient temperatures from as low as -30°F
(-34.4°C) up to 120°F (48.9°C).
Sensitive electronics must be maintained in a
stable environment of 64.4°F to 80.6°F (18°C to
27°C) with moisture between 41.9°F (5.5°C) dew
point and 60% relative humidity with 59°F (15°C)
dew point. Computers and communications
equipment generate six to ten times the
heat density of normal office space, the air
conditioning system must have more than just
enough cooling capacity.

A Tradition Of Reliability You Can Count On
Liebert Precision Cooling equipment is the
standard by which all others are judged.
The number of units that are in the field
far exceeds the combined number of all
other brands. Nine out of ten Fortune 500
Companies use Liebert cooling systems.
Liebert Precision Cooling Systems are used
in the most demanding, critical applications
in the world. From banking to government
to corporate computer and communications
centers, when it has to be the best—this is
the brand of choice.

It must have the precision to react quickly to
a drastic change in heat load and prevent wide
temperature fluctuations—something a large
building HVAC system cannot do.

Liebert® DS TM delivers Efficiency Without Compromise TM

Efficiency Without Compromise provides a path to optimize data center infrastructure around design, operating and
management efficiencies – while maintaining or improving availability. This is achieved through the proper selection and
utilization of cooling, power and monitoring technologies, supported by key services and local expertise.
INFRASTRUCTURE
MANAGEMENT
Improving performance
of the IT infrastructure
and environment

2

ECO AVAILABILITY
Balancing high levels of
availability and efficiency

FLEX CAPACITY
Adapting to IT changes for
continuous optimization
and design flexibility

HIGH DENSITY
Delivering architectures
from 10–60 kW/Rack to
minimize space and cost

The Liebert® DS™ is Designed and Built
Like No Other
Why You Should Specify Liebert DS Over
Competitive Precision Systems
Proper protection of critical facilities takes more than
bolting together pre-engineered computer room cooling
modules. In many cases, your critical systems are only
as reliable as the support equipment protecting them.
Compromising on a less capable precision cooling system
can compromise your operations. Your critical operations
demand support equipment that can provide the highest
level of reliability.
Engineering Excellence Goes Into Every Liebert DS
The Liebert DS is based on the proven design and
technology of Liebert Deluxe Systems used in thousands of
critical data centers around the world since 1965. Full scale
analysis and evaluation of the Liebert DS during all phases
of development and production is your assurance of the
most advanced performance and highest quality. Units are
thoroughly tested under a wide variety of temperature and
humidity conditions.

Reliability:
The Liebert DS is designed with the highest quality
components selected for their proven reliability and
performance.
Microprocessor technology adds automatic sequencing
of components to even wear and extend service life.
An alarm system and self-diagnostics provide rapid
troubleshooting and can prevent a problem before it
affects the electronic equipment room environment.
Air delivery system designed for optimized air
distribution and long service life.
Corrosion resistant frame and cabinet.
Flexibility:
Available in both downflow and upflow configurations
to cover a wide range of room applications.
Choice of compressors to match performance and
energy efficiency requirements.Front access provides
easy serviceability and saves valuable floor space.
Modular frame construction allows even more flexibility
in meeting specific needs for installation—frame can be
field-separated into three sections.
Built-in humidity control and reheat function.
Liebert iCOM control system brings high-level
supervision to multiple units allowing them to
work together as a single system to optimize room
performance.
R-407C environmentally friendly refrigerant.
Low Total Cost Of Ownership:
Energy efficiency options and configurations can save
money and even pay back part of your investment over
the life of the product.
Built for serviceability, with many components—such as
the Paradenser™ cleanable condenser—designed to be
maintained rather than replaced.
Specifically designed for the demanding requirements
of year-round operation, the Liebert DS is actually
less expensive to operate over its life cycle compared
to both comfort cooling equipment and competitive
precision air conditioning products.
3

Engineered For Precision, Efficiency And Strength

The Liebert® DS™ is designed to fit room applications
requiring high level precision control of the room
environment, including temperature, humidity,
filtration and airflow.
Precise Temperature And Humidity Control
The environmental control system must be able to sense
and react to temperature and humidity fluctuations far too
small for building HVAC systems to control. The Liebert
DS is capable of control to within ±1°F (°C) and ±1% RH. By
analyzing the rate of change in temperature or the moisture
content in the environment, the control system anticipates
what is going to happen in the room, not simply responding
to what has happened.

Designed For Energy Efficiency
Liebert DS provides maximum energy efficiency
without compromising the accuracy and reliability
demanded by sensitive electronics. All enhancements
to energy efficiency are designed to reduce operating
time of key components and increase the Mean
Time Between Failure. This is accomplished by
taking advantage of alternate sources of cooling by
minimizing compressor operation when heat loads in
the conditioned space are lower. Energy savings is also
gained through the use of high efficiency components
such as advanced digital scroll and 4-step semihermetic compressors.
Quality, Rugged Construction
The durable design of the Liebert DS provides a stable,
virtually vibrationless platform for compressor and fan
operation:
Autophoretic® frame coating—protects frame against

corrosion for years of reliable service.
Welded frame—14 gauge steel provides rugged

construction, proven to withstand shipping and
handling through ISTA (International Safe Transit
Association) certified ship testing.
Durable powder coated exterior panels—look good

and stay that way.
Slot and tab sheet metal—for consistent, quality

construction.
Optional double-skin panels—eliminate insulation in

the air stream. This allows for easy panel cleaning.
Optional floorstands—Adjustable standard and

seismic-rated floorstands allow for installation and
connection of the system prior to the installation of
the raised floor. Available in heights from 6” to 36”, a
field installed turning vane may be specified.

4

Front Access And Serviceability Save
Valuable Floor Space
Total front access provides space and
serviceability benefits not found on
previous models or competitive units.
The Liebert® DS™ can be placed
adjacent to or in back of other
equipment or against a wall or
partition.
All key components are visible and
accessible—from the front of the unit
for easy maintenance and removal.
Compressors are removable from
front—isolated from air stream for
easier maintenance.

Modular Frame Construction
The unit’s modular frame
construction allows even more
flexibility in meeting specific needs
for installation, energy efficiency and
other special requirements.
The frame can be field-separated into
three sections—enabling the unit to
fit into small elevators or through
other tight spaces.

5

Flexible Cooling Configurations

The Liebert® DS™ provides a complete environmental
control package, including both precision air
conditioning as well as humidity control. Both upflow
and downflow configurations are available to cover
raised floor and non-raised applications.
The Liebert DS product line has been designed
to cover the widest possible range of application
requirements. These include choice of airflow
configuration, cooling method options and many
other selections that will create the most effective and
efficient system for your facility.
Liebert DS Units Can Be Configured For Optimum
Cooling Of Any Type Of Space
Downflow configurations are designed for use in raised
floor applications such as data centers and other
facilities housing sensitive electronic equipment.
The Liebert DS downflow configuration combines
top air return with bottom air supply to circulate air
underneath the floor.

Liebert DS Downflow

Upflow units can be specified in situations where

the floors are not raised, such as communications
facilities, industrial control rooms and laboratories.
These units can supply air directly into the room or be
connected to distribution ductwork.
Compressorized Systems Offer Flexibility,
Efficiency, Reliability
Long recognized as the standard in environmental
control systems for data center operations, Liebert
DS compressorized systems are built to the highest
specifications in the industry with proven components
and design. They feature direct expansion operation in
four types of cooling configurations: air cooled, water
cooled, glycol cooled and our exclusive GLYCOOL freecooling option.

6

Liebert DS Upflow

The Widest Variety Of Air Supply Choices

Downflow Supply

Designed for raised-floor applications, the downflow
air supply configuration is commonly found in data
centers and other similar facilities housing sensitive
electronic equipment.

Top Front Supply with Plenum & Grille
and Front Return

In-the-space applications without ductwork, such as
Telecommunications, Networks and Switching Centers,
benefit from this economical configuration. Optional high
filtration may be desirable.

Top Front Supply and Front Return

Engineered for in-the-space applications utilizing
duct work, this airflow design is commonly used for
Telecommunications or Industrial applications. High
static pressure and filtering options may be selected.

Top Rear Supply and Rear Return

Designed for use in out-of-space applications, this
configuration is typical for Industrial Processes such as
Control Rooms, and Labs. Many of these sites will select a
higher static pressure and optional high efficiency filters.
(Customer ducted supply and return)

7

Air Delivery System Designed For Optimized Air
Distribution And Long Service Life
Constant delivery of
full airflow to keep
delivering cold air
when needed.

5-YEAR WARRANTY
on drive components
(bearings, belts, shaft,
pulleys).

Flexibility for high
filtration or external
static pressures up to
2.5”(625 Pa).

Centrifugal blowers
enable performance
over a wide range of
air volume and static
pressure ranges.
Pillow block fan
bearing with
minimum L3 life of
200,000 hours.
Static regain duct
improves underfloor air
distribution.

Pentadrive™ Blower - Special 5-year Liebert Belt.
Automatic self-tensioning motor base increases
belt life and reliability of shaft and bearings.

Computers and other sensitive electronics require greater
air volumes than comfort air conditioning can provide. The
high density heat load in the relatively small space of a data
center requires more air changes to remove heat properly.
A key to the outstanding performance of the Liebert® DS™ is
its optimized air delivery design. It combines high efficiency
and effective air handling to deliver reliable, constant cooling
under the most demanding conditions.

High efficiency motor
meets NEMA Premium
motor standard.

Pentadrive™ Blower System
Large capacity fans are dynamically balanced
to minimize vibration and provide even air
distribution. The low velocity fans use less fan
motor energy and operate more quietly than
forced air blowers. Filtered air at the right
temperature and humidity is fed positively and
evenly into the room.

Motors
The Liebert DS features fan motors that are optimized for reliability and energy efficiency.
High-efficiency open drip-proof motor meets National Electrical Manufacturers Association (NEMA) Premium

motor standard.
Motor Options
Optional TEFC (Totally Enclosed Fan-Cooled) motors—for rugged industrial environments.
Optional larger horsepower motors available—for higher air volume or higher static pressures.

8

Energy Efficient Fan Selections

Variable Speed Drive (VSD)
Fan Motor
Liebert® DS™ models with
digital scroll are available with
an optional variable speed drive
(VSD) on the fan motor used to
drive the centrifugal blowers,
matching the motor speed to
the room cooling requirements.
This feature allows the unit to
use far less motor energy to
move room air. The VSD drive is
controlled by the Liebert iCOM
control system to match the
speed of the blower with the
compressor load consequently
the load in the room. This
option eliminates excessive
energy use due to an oversized
design or changing room
conditions.

The downflow floormount Liebert DS models, larger than 12 tons, are
now available with energy efficient EC Plug Fans.
These energy efficient fans add to the superior efficiency already
achieved by the use of a traditional variable speed drive system. In fact,
many utility companies offer a rebate for using these energy efficient
options – check with your local utility for details.
The Liebert DS with EC Plug Fan
delivers energy efficiency gains via
the fan system. These electrically
commutated fans are a backward
curved motorized impeller powered
by a direct drive DC Motor with
integrated AC-DC conversion.
This design uses less energy than
standard centrifugal blowers by
lowering motor kW. The EC Plug Fan
uses 10-30% less energy on average
than standard AC motors.

The EC Plug Fan is located in the area
beneath the raised floor or within the
unit. Superior energy savings can be
realized with the fans located beneath
the raised floor. Placing the fan in
the raised floor space, is 30 percent
more energy efficient than centrifugal
blowers. The EC Plug Fan also provides
greater energy savings than variable
speed drives.

9

Dependable, Effective Cooling System

Draw-through design pulls
air evenly through the
cooling coil, reheat and
humidification systems.

Optional polymeric coating on
coils protects against corrosion
due to harsh environments.

A-frame coil design maximizes
coil area, reduces air velocity,
lowers chance of water
blowing off coil, results in far
less turbulence with superior
efficiencies in heat transfer.

At the heart of the Liebert® DS™ are its cooling system components, each designed to provide
maximum reliability.
A-Frame Coil
This Liebert designed and manufactured
A-Frame coil features a large face area/low face
velocity design for precise control of cooling and
dehumidification— and is designed to optimize
heat transfer and minimize pressure drop.
Dual Refrigeration Circuits For Redundancy
Dual compressors and refrigeration circuits
assure reliability and feature automatic
sequencing for even wear of components.
Components include dual compressors and dual

Refrigeration System Features
Each refrigeration circuit includes:
Sight glasses serve as a means of quick visual inspection to

determine if there is moisture in the system and if the system is
properly charged.
Refrigerant dehydrators assure a moisture-free refrigerant

system for extended component life.
Expansion valves – Externally equalized expansion valves

smoothly control refrigerant flow during indoor heat loads and
outdoor ambients by controlling evaporator superheat.

refrigeration circuits enabling the system to
operate even if one circuit fails.

Muffler – Specially engineered mufflers afford a quiet pulsation-

Pump-down evacuation of refrigerant from
compressor crankcase shields the compressors

Safety controls – Each compressor has an automatic reset high

from the “hard starts” that can shorten
their life.

10

free refrigeration system.
pressure switch which locks-out after the third trip. A low
pressure transducer protects against coil freezing and low
refrigerant pressure.

Hybrid Designs Deliver Maximum Energy Efficiency

Optional 70/30 Cu/Ni free-cooling
coil must be specified to prevent tube
corrosion when used with a cooling
tower loop or other open water system.

Provides redundancy
and energy savings for
increased ROI.

Optional econo-coil rests on an
A-frame coil to minimize air pressure
drop and increase efficiency.

For even greater efficiency and reduced operating
costs, Liebert® DS™ offers energy saving alternatives
such as our GLYCOOL and Dual Cool options. Used
where the climate permits, a conventional air or water
cooled direct expansion system adds a second cooling
coil which utilizes a building chiller supply to reduce
compressor operation.
GLYCOOL™ System
The Liebert GLYCOOL freecooling system incorporates a
conventional glycol cooled unit along with the addition
of a second cooling coil, control valves and a comparative
temperature monitor. This allows the system to take
advantage of cooler outdoor temperatures to reduce or
eliminate compressor runtime.
During colder months, the glycol solution returning from
the outdoor drycooler is routed to the second coil by a
pre-piped modulating three-way valve. Located upstream
of the evaporator coil, the second coil becomes the primary

Dual Cooling coil increases availability
by using building chilled water as
primary, compressor as back-up.

source of cooling for the room. This coil is sufficiently sized
to offer the identical cooling capacity as is obtained during
the refrigeration cycle of both compressors.
Dual Cool
Utilizing this option, a conventional air cooled Liebert DS is
converted to a dual source cooling system by the addition
of a second coil that utilizes a central building chiller supply.
Using a modulating control valve and a comparative
temperature sensor, the unit can function either as a
chilled water system, as a compressorized system—or a
combination of both.
During times when the chiller supply is available,
compressor operation is eliminated, reducing energy costs.
Switchover between the two cooling modes is performed
automatically by a microprocessor control and temperature
sensor. In addition to energy efficiency, this option can
provide increased redundancy and flexibility to the
environmental control system.
11

Air Delivery System Designed For Optimized Air
Distribution And Long Service Life
A key to the ability of a quality
Precision Cooling system to control
conditions within the critical space is
its high “sensible heat ratio.”
Unlike people, computers generate dry or
“sensible” heat, but not humidity. With
a large percentage of their total capacity
devoted to the removal of moisture,
comfort systems can lower room
humidity far below acceptable standards
for electronic equipment— and they have
no provisions for adding moisture.
To correct this situation, precision air
conditioning systems typically have a
high ratio of sensible-to-total cooling
capacity to remove heat from the air. This
capability is provided through the use
of integrated humidification systems to
provide the necessary level of moisture
control, higher air supply capacity
and larger coil size.

Standard
Infrared
Humidifier

Humidifier makeup
valve controls flow
of water to the
humidifier pan.

Pure water
vapor provides
most effective
humidification.

Does not depend on water
quality. High-intensity
quartz lamps shine on water
creating instantaneous
moisture using almost any
water quality.

Humidity Control
Maintaining the correct humidity level in the room is just as important
as maintaining proper temperature. Inadequate humidity control can
cause static electricity if it’s too dry—or condensation that can corrode
circuitry if the air is too moist. The Liebert® DS™ utilizes an integrated
humidification system to provide the necessary level of moisture control.
Standard Infrared Humidifier
Instant Humidification—on when needed, off when not needed.
Optional Steam Generating Canister Humidifier
Utilizes replaceable bottle—requires a specific water quality level for
optimum operation.
Utilizes a drain and refill cycle—to maintain a current setpoint.
Dehumidification Control
The compressors operate at full capacity during dehumidification. The
precision control of the Liebert DS saves energy by tightly regulating
compressor operation and avoiding over dehumidification that causes the
humidifier to come on when not needed.

12

Natural air-gap. No
need for back-flow
prevention.

Autoflush system
reduces build-up
of mineral deposits
and impurities in the
water pan.

High water float
switch shuts down
humidifier upon
high water.

Bypass air slots
ensure that moisture
can be introduced
into air stream.

Cleanable stainless
steel humidifier
pan. Removable
from front.

Reheat Function
The reheat function of the Liebert DS is
primarily used to keep the temperature
from going too low during the
dehumidification cycle.
Standard Reheat
Three-stage electric reheat—low wattdensity, 304 stainless-steel fin-tubular
reheat, location maximizes airflow to
maximize element life and improve
reliability.

Filtration System
The Liebert® DS™ features integral air filtration to protect against airborne
contaminants within the critical environment. Without proper air filtration,
even small amounts of dust and other particles can damage storage media
and charged electronic components.
High-efficiency air-filtration—removes damaging particles from air.
Standard filter—4” deep, Merv 8. (45% ASHRAE 52.1).
Optional high-efficiency filter—4” deep, Merv Merv 11 (60-65%
ASHRAE 52.1)
Optional 2” Merv 8 pre-filter with 2” Merv 11 filter.
V bank filter arrangement—reduces air pressure drop, top filter access.

Reheat Options
SCR electric reheat—For specialized
applications requiring tight temperature
control. Multiple pulses of reheat vs.
three equal stages provide smooth
temperature adjustment.
Optional hot water reheat—Uses
existing building hot water, saving
energy.
Reheat/humidifier lockout—Reduces
power requirements during emergency
power operation.

13

A Choice Of Compressors Offers Higher Efficiency, Adaptability
And Reliable Operation

A standard fixed-capacity scroll compressor.
An optional Digital Scroll compressor with energy
saving, variable capacity operation.
The Standard Scroll Compressor: Rugged, Quiet,
Efficient
The standard scroll compressor offers efficient, reliable
performance with a robust design that contains only
a few moving parts. Quiet operation is accomplished
through a continual, smooth compression process.
Discharge gas and vibration are kept at a low level.
The Digital Scroll Compressor: A New Standard For
Performance and Reliability
The exclusive digital scroll compressor option on
the Liebert DS utilizes the latest control technology
to deliver precise operation and significantly higher
energy efficiency. In addition to the advantages of the
dependable scroll design, Digital Scroll technology
provides infinitely variable capacity modulation that
enables the output to precisely match the changing
cooling demands of the room. This approach is as
much as 30 percent more efficient than traditional hotgas bypass. Benefits include:

Cumulative Compressor Cycles As Load Grows
From 50% To 100%
70% Load

60% Load

90% Load

80% Load

140000

Cumulative Compressor Cycles

It Starts With Reliable Scroll
Compressor Technology
The scroll compressor design provides high efficiency,
low sound levels and excellent durability. The Liebert®
DS™ precision cooling system is available with either:

Single Compressor

120000
100000

Two Compressors

80000
60000
40000
20000

Digital Compressor

0
Year 1

Year 2

Year 3

Year 4

Increasing compressor cycling takes a toll on compressor
life. Liebert Four-Step Semi-Hermetic compressors and
Digital Scroll compressors automatically adjust to yearly
increases in heat load, providing significantly greater
component life than other compressor technologies.

Greater energy savings—variable capacity system

allows maximum load tracking for higher efficiency.
Improved reliability—by reducing compressor cycling

and component wear.
Improved performance—the compressor can easily

adapt to changing load conditions, providing precise
temperature control.
50% Load

Digital Scroll
Capacity Control
Diagram

100%
capacity

7.5 secs

7.5 secs
15 secs
5 secs

Future Load

0%
capacity

Digital Scroll Capacity
adapts as load changes

100%

Initial Load

33% Load
10 secs

14

10%

Capacity
Load

Four-Step Semi-Hermetic Compressors:
Proven Performance
The Liebert® DS™ Four-Step system achieves high
levels of energy efficiency through the integration of
two high-efficiency semi-hermetic compressors with
capacity control valves, an advanced microprocessor
control system and a computer-optimized cooling coil.
The Four-Step system reduces compressor cooling
capacity and energy consumption during periods of
low room load conditions. As a result, four distinct
stages of cooling are activated to more closely respond
to changing room conditions. Reliability is enhanced by
fewer and less stressful compressor starts for
reduced wear.

New Refrigerants To Meet Government Regulations
Without the ability to utilize newer environmentallyfriendly refrigerants, your cooling equipment could
become obsolete and “out of compliance.” The Montreal
Protocol and EPA Clean Air Act require cooling equipment
manufacturers to switch to environmentally-friendly
refrigerants by 2010.
R-407C environmentally-friendly refrigerant is the

standard in the Liebert DS.

Energy Savings
100% 100%

88%
75%

76%
50%
38%
25%

Step Four

Step Three

Capacity

Energy

Step Two

Step One

Energy Savings

Saturated Condensing Temperature

4-Step Compressor Operation Improves
Energy Efficiency Ratio
22.4

105°F
110°F
115°F
120°F
125°F
130°F

11.7

12.8

14.0

45°F

50°F

55°F

Semi-Hermetic Compressors

Saturated Evaporator Temperature

15

Liebert iCOM®
Small Graphic Display

The Liebert iCOM control system
featured on the Liebert® DS™ brings
high-level supervision to multiple
units allowing them to work together
as a single system to optimize room
performance. The Liebert iCOM
control system offers a variety of
advantages.
Various Intelligent Control Methods
Return Air Temperature is a traditional
method that changes the unit
capacity based on the return air
temperature to the unit
Supply Air Temperature is a method
that changes the unit capacity based
on the unit outlet air temperature.
Static Pressure Control uses a single
pressure sensor to adjust the fan
speed. The airflow compensates for
floor tile layout changes.
Dynamic Cold Aisle Management
(DCAM) separates the fan speetd and
cooling capacity to meet the server air
volume and heat load. This allows less
energy to be used forthe same amount
of cooling.
Intelligent Communications And
Monitoring
Saves Energy using Predictive
Humidity Control.
Built-in Lead/Lag Functions for
enhanced system reliability.
Wellness Calculation alerts service
personnel before problems occur.
Unit to Unit Communications allows
Lead/Lag and optional teamwork
settings for maximum flexibility of
control of up to 32 units per zone and
up to 99 zones per network.

16

The standard Small Graphic Display features a 128x64 dot matrix backlit
screen. Advanced monitoring can be achieved with the addition of the
Optional Wall Mounted Display.

The Optional Wall Mounted
Large Graphic Display provides
centralized monitoring and control
of connected Liebert DS units.

The optional vNSA with iCOM
combines a Wall Mounted Large
Graphic Display along with a
network switch to facilitate U2U
wiring in one convenient cabinet.

U2U Configuration 2
Liebert DS units with Small Graphic Display may be centrally
monitored and controlled with the Optional Wall Mounted Display.
Power

Operating

Operating

Standby

Alarm

Operating

Standby

Teamwork: Mode 2
Units work together to provide precision cooling in rooms with
unbalanced loads.

Maintenance /
Wellness Setup

Large Graphic Display

The optional Large Graphic Display features a 320x240 dot matrix
backlit screen with helpful system and maintenance views.
Additional Views Available with
Large Graphic Displays
System View—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.
Spare Parts List—Critical spare part numbers are saved in unit
memory and may be displayed on the Large Graphic Display,
speeding identification of parts.

Removable display makes
troubleshooting servicing easier.

Unit Diary—Free field area within the unit memory where unit
maintenance shares history with any authorized users or loggedin service contacts, including record of what others have done.

Parts list available on control
for easier maintenance.
On-board Unit Diary provides
a maintenance history to any
authorized user.
Unit Diary

Spare Parts
STANDBY SETTINGS / LEAD-LAG
S501
S502
S503
S504
S505
S506
S507
S508
S509
S510
S511

SYSTEM

PASSWORD (Actual Level 0)
Number of Standby Units
Rotation Frequency
Rotate at (hour)
Rotate at (minute)
Rotate by
Perform one Rotation
Cascade Units
Start all Standby Units by HT

for next/previous unit
then
to change parameter

????
0
No
00
00
1
No
No
No

to select parameter
to confirm

Standby Settings (Lead/Lag Set-up)

Monitors all key system
functions and reports to alarm,
if needed.
On-board Unit Diary provides
a maintenance history to any
authorized user.

17

Easy Component and Control Option Access
Electric Panel
The electric panel of the Liebert® DS™ is designed for easy access to critical electrical and control components.

IntelliSlot™ for
easy plug-in
of optional
communication
cards.

Low voltage
terminal strip
provides
connection
flexibility.

Optional
disconnect switch
available as nonlocking or locking.

Location for
optional secondary
disconnect switch for
non-critical loads.

Deadfront panel
folds down for easy
viewing of electrical
schematic.

Unit Monitoring And Control Options
Dual float condensate pump—installed in unit, with
secondary float to shut down unit and trigger alarm if
high water detected.

Optional solidstate
contactors used
on SCR reheat for
tight temperature
applications.

Individually-fused components
high-rated fuses for maximum
reliability, high interrupt rating,
and cooler operating fuses for
maximum reliability.

Control interface
board for easy
access.

alarm. Dry contacts are available for a remote customer
alarm. This smoke sensor is not intended to function as,
or replace, any room smoke detection system that may
be required by local or national codes.

Optional low voltage terminal package—two extra n/o
common alarm contacts, two extra remote shutdown
terminals, one main fan auxiliary contact. When
connected to an optional water sensor, shuts down unit
and provides dry contact closure.

Analog input wiring—includes four customer-accessible
analog inputs for sensors provided by others. The
analog inputs accept a 4 to 20 mA signal. Gains
Calibration for each input are programmable from the
front panel.

High temperature sensor—alerts users to any high
temperature situations within the system. Senses
return air temperature and shuts down unit if
temperature exceeds 125°F (51.7°C).

Compressor overload—activates an audible and visual
alarm in the event of a compressor overload.

Smoke sensor—senses the return air, shuts down the
unit upon detection, and sends visual and audible

18

Main Fan Overload—activates an audible and visual
alarm in the event of a motor overload.

Paradenser™ Cleanable Condenser Provides Liebert® DS™
With Longer Service Life

Liebert DS offers the new Paradenser™ condenser for
use in water/glycol systems. This patented component
utilizes a counter-flow design and features a shell and
tube type construction.
Fully cleanable—eliminates costly condenser failures
due to plugging and providing a longer service life. This
reduces fouling and scaling which can degrade heat
rejection performance and result in cooling system
shutdown.
Large water passages prevent plugging and allow for
conventional tube cleaning methods.
Sturdy, corrosion-resistant materials—Steel shell, copper
tubes, and nickel-plated plug are durable,
non-corrosive and easy to clean.
Shell side of the condenser acts as a receiver—holds
refrigerant charge during pumpdown.
Utilizes no gaskets—offers further reliability by
preventing leaks.

Fully cleanable Paradenser tubes are
located for convenient maintenance.

19

Liebert Heat Rejection Systems—Flexible
ConfigurationsTo Meet Application Requirements
Liebert Condensers & Drycoolers
Emerson Network Power manufactures its own highefficiency Liebert air cooled condensers and drycoolers
that are precisely matched to the heat rejection
requirements of our precision air conditioning systems.
Constructed with an aluminum cabinet and a coppertube aluminum-fin coil, these exceptionally dependable
units are corrosion resistant and designed to operate
for prolonged periods of exposure to the worst weather
conditions. Liebert condensers and drycoolers are fully
factory wired and tested for easy installation.

Wide range of heat rejection solutions—vertical or

horizontal airflows, indoor or outdoor models,
freestanding or ducted configurations.
Standard units—Sized for maximum outdoor

ambient temperatures of 85 °F (29.4°C) to 105°F
(40.6°C).
Liebert VFD Control Condenser—Features a

variable frequency drive (VFD) and an inverter
duty fan motor with ceramic bearings. The VFD
control integrates pressure variations from
either compressor operation, including digital
scroll compressors, using pressure transducers
and modulates the condenser fan motor speed
to hold condensing temperatures constant.
This system allows for operation at ambient
temperatures as low as -20°F (-28.9°C).
Fan Speed Control Condenser—A fan-speed

control varies the variable speed fan motor
based on compressor head pressure to maintain
constant condensing temperatures. This system
allows for operation at ambient temperatures as
low as -20°F (-28.9°C).
Drycoolers, Pumps, Tanks and Controls—Complete

heat rejection solutions for glycol-cooled and
GLYCOOL units consist of drycoolers, glycol
pumps, expansion tanks and integral or separate
pump electrical control boxes.
Quiet-Line™ Condenser/Drycooler—Operate

with the lowest noise level of any heat rejection
available, offering levels of less than 57 dBA.
Indoor Piggyback Condenser/Drycooler—Indoor

condensers/drycoolers designed to provide
heat rejection by ducting air from outside the
building, such as high-rise buildings.
Outdoor Centrifugal Condenser/Drycooler—

Centrifugal drycoolers suitable for outdoor or
indoor mounting, providing heat rejection for
unique applications requiring ducted airflow.
High Ambient Condensers—Utilize increased coil

surfaces for operation in outdoor climates up to
120 °F (48.9 °C).

20

The Liebert DS Has A Solution
To Meet Your Critical Needs

Water Cooled

Remote
cooling
tower

No Other Precision Cooling System
Offers This Much Flexibility

A-frame
coil

Long recognized as the standard in environmental
control systems for data center operations, the Liebert
DS is built to the most demanding specifications in the
industry with proven components and design.

Paradenser
Tubes
Compressors

Liebert® DS™ features compressorized direct expansion
operation in air cooled, water cooled and glycol cooled
configurations, as well as GLYCOOL™ free-cooling
models and chilled water systems.

Centrifugal
Blower

Air Cooled

Glycol Cooled

Glycol circulating
pump
A-frame
coil
Liebert
drycooler

Condenser
with optional
Lee-Temp
Package

Compressors
Centrifugal
Blower

GLYCOOL™ System with free-cooling cool
Glycol
circulating
pump

A-frame coil inside
Econ-ocoil rests
on
A-frame
coil

Liebert
drycooler

Piggyback Heat Rejection Configurations

Air-cooled or
Glycol-cooled
configurations
available

Fan

Paradenser
Tubes
Compressors

Centrifugal
Blower
Glycol-cooled
condensers

Coil

21

Stand-Alone Monitoring And Leak Detection Solutions
Autonomous microprocessor controlled modules are
available to provide supervision, control and remote
notification of Liebert® precision cooling equipment.
These stand-alone devices include:
Liebert Universal Monitor
The Liebert Universal Monitor is an all-purpose, easy-to-use
microprocessor-based monitoring panel with connections for
up to 8 digital inputs, 8 digital outputs and 4 analog inputs.
Designed to bring critical monitoring information directly to
your facility or offsite location, the unit includes an on-board
modem to provide remote monitoring while minimizing
configuration and installation requirements. It features a
built-in LCD user interface, making the panel self contained
and accessible without additional hardware and software.

Liqui-tect 410 Point Leak Detection Configuration

Liqui-tect 460 Zone Leak Detection Configuration

Contact Closure Alarm Panels
The Liebert RCM series of contact closure alarm panels
provides customized alarm indication at a single location
for any dry contact input from environmental, power and
UPS systems, including Liebert units. These remote systems
continuously monitor your most critical support equipment
and instantly alert you to alarm conditions. Three different
system configurations are available for monitoring up to
eight points with communications and pager interface plus
eight digital outputs.
Liebert Leak Detection Modules
Liebert Liqui-tect® leak detection systems
provide quick sensing and accurate reporting
of leaks below the floor or above the ceiling
in critical facilities. These reliable systems
provide immediate warning and precise
location, allowing you to find and correct a
leak before moisture can damage computers,
wiring connections or other sensitive
electronics.

Liebert Universal Monitor

22

Temperature and Humidity Recorder
A seven-day temperature and humidity recorder
permits close examination of computer room
environment condition and can be used as a
permanent record of the environmental control
system’s operation efficiency.

Maximizing Your Investment Through Adaptive Monitoring
Distributed Management With
Liebert IntelliSlot® Interface Cards
For enchanced remote communications
and control of your Liebert units, the
Liebert IntelliSlot Web and 485 Cards
deliver the communication capabilities
you require.

Centralized Management With
Liebert Nform™ Software
As business grows, your critical
equipment infrastructure will
expand, thus the need for centralized
management of this equipment will
be key to your business success.
Connecting to equipment in the
Monitoring and control through your distributed critical space is only part of
existing Network with no additional the monitoring challenge.
software required.
Liebert Nform leverages the
network connectivity capabilities of
Each Liebert system equipped with an
your Liebert equipment to provide a
Liebert IntelliSlot Web Card takes full
centralized monitoring view of your
advantage of your Ethernet network,
allowing remote monitoring from your distributed equipment.
computer desktop, network operations
Utilizing the SNMP and Web
center or wherever network access is
permitted, without the need for front- technologies built into each of the
Liebert IntelliSlot communication
end software.
cards, Nform will centrally manage
alarm notifications to provide you
Monitoring integration with your
with an easy interface to access critical
existing Building Management
status information.
System.
A Liebert system equipped with an
IntelliSlot 485 Card can be seamlessly
integrated with your existing Building
Management System.

Liebert Nform puts critical systems
information at the fingertips of
support personnel—wherever they
are—increasing responsiveness to
alarm-event conditions, thus allowing
IT organizations to maximize their
system availability.

Liebert IntelliSlot Web

Liebert Nform

Enterprise Management with Liebert
SiteScan® Web Software
For customers who require extensive
management of critical system equipment
that may span multiple locations in an
ever-moving 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
Event Management and Reporting
Data Analysis and Trending
Building Management Integration
Liebert SiteScanWeb 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.
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.

Liebert SiteScan Web
23

Emerson Network Power, a business of Emerson (NYSE:EMR), delivers software, hardware and
services that maximize availability, capacity and efficiency for data centers, healthcare and
industrial facilities. A trusted industry leader in smart infrastructure technologies, Emerson
Network Power provides innovative data center infrastructure management solutions that
bridge the gap between IT and facility management and deliver efficiency and uncompromised
availability regardless of capacity demands. Our solutions are supported globally by local
Emerson Network Power service technicians. Learn more about Emerson Network Power
products and services at www.EmersonNetworkPower.com

Emerson Network Power
Global Headquarters
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.)
Contact@EmersonNetworkPower.com

Emerson Network Power
Caribbean and Latin America
Office – United States of America
+1-954-984-3452 Phone
Ask.Cala@Emerson.com

Emerson Network Power Canada
3580 Laird Rd Unit 1
Mississauga
Ontario L5L 5Z7
+1 905 569 8282
Ask@EmersonNetworkPower.com

liebert.com
24 x 7 Tech Support
800 222 5877 Phone
614 841 6755 (outside U.S.)

EmersonNetworkPower.com
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. All
names and logos referred to herein are trade names,
trademarks or registered trademarks of their respective
owners. ® Liebert is a registered trademark of the
Liebert Corporation.
© 2014 Liebert Corporation. All rights reserved
throughout the world. Specifications subject to change
without notice.
Emerson Network Power and the Emerson Network
Power logo are trademarks and service marks of
Emerson Electric Co.
©2014 Emerson Electric Co.
SL- 18810 (R08/14)

Printed in USA



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