Emerson Liebert DS 28-105kW Brochures and Data Sheets

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.

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 of ce space, the air

conditioning system must have more than just
enough cooling capacity.

Liebert DS Is Ideally Suited For:

Data Centers

Computer Rooms

Network Operations

Telecom/CATV

Labs And Testing

Production Facilities

Centers

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  eld

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 Ef ciency 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

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

2

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 downow and upow congurations

to cover a wide range of room applications.

Choice of compressors to match performance and

energy efciency requirements.Front access provides
easy serviceability and saves valuable oor space.

Modular frame construction allows even more exibility

in meeting specic needs for installation—frame can be
eld-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 efciency options and congurations 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.

Specically 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, Efciency 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 uctuations 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 efciency

without compromising the accuracy and reliability
demanded by sensitive electronics. All enhancements

to energy efciency 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 efciency 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

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) certied ship testing.

®

frame coating—protects frame against

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 oorstands allow for installation and

connection of the system prior to the installation of

the raised oor. Available in heights from 6” to 36”, a
eld installed turning vane may be specied.

4

Front Access And Serviceability Save
Valuable Floor Space

Total front access provides space and

serviceability bene ts 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

 exibility in meeting speci c needs
for installation, energy ef ciency and

other special requirements.

The frame can be  eld-separated into

three sections—enabling the unit to

 t into small elevators or through

other tight spaces.

5

Flexible Cooling Congurations

The Liebert® DS™ provides a complete environmental
control package, including both precision air

conditioning as well as humidity control. Both upow
and downow congurations are available to cover
raised oor 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 airow
conguration, cooling method options and many

other selections that will create the most effective and

efcient system for your facility.

Liebert DS Units Can Be Configured For Optimum
Cooling Of Any Type Of Space

Downflow congurations are designed for use in raised

oor applications such as data centers and other

facilities housing sensitive electronic equipment.

The Liebert DS downow conguration combines

top air return with bottom air supply to circulate air

underneath the oor.

Liebert DS Downflow

Upflow units can be specied in situations where

the oors 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

specications in the industry with proven components

and design. They feature direct expansion operation in

four types of cooling congurations: air cooled, water

cooled, glycol cooled and our exclusive GLYCOOL free­cooling option.

Liebert DS Upflow

6

The Widest Variety Of Air Supply Choices

Downflow Supply

Designed for raised- oor applications, the down ow

air supply con guration 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,

bene t from this economical con guration. Optional high
 ltration may be desirable.

Top Front Supply and Front Return

Engineered for in-the-space applications utilizing

duct work, this air ow design is commonly used for

Telecommunications or Industrial applications. High

static pressure and  ltering options may be selected.

Top Rear Supply and Rear Return

Designed for use in out-of-space applications, this

con guration is typical for Industrial Processes such as

Control Rooms, and Labs. Many of these sites will select a

higher static pressure and optional high ef ciency  lters.

(Customer ducted supply and return)

7

Air Delivery System Designed For Optimized Air
Distribution And Long Service Life

Constant delivery of

full air ow to keep

delivering cold air
when needed.

Flexibility for high

 ltration or external

static pressures up to

2.5”(625 Pa).

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

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 under oor 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 ef ciency 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 ef ciency.

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

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.

Energy Ef cient Fan Selections

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 ef ciency 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  oor or within the

unit. Superior energy savings can be
realized with the fans located beneath

the raised  oor. Placing the fan in
the raised  oor space, is 30 percent
more energy ef cient 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

humidication 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

efciencies 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

Refrigeration System Features

Each refrigeration circuit includes:
A-Frame coil features a large face area/low face
velocity design for precise control of cooling and

dehumidication— 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 circuits enabling the system to
operate even if one circuit fails.

Pump-down evacuation of refrigerant from

compressor crankcase

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

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 ow during indoor heat loads and

outdoor ambients by controlling evaporator superheat.

Muffler – Specially engineered mufers afford a quiet pulsation-

free refrigeration system.

Safety controls – Each compressor has an automatic reset high

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

10

Hybrid Designs Deliver Maximum Energy Ef ciency

Optional 70/30 Cu/Ni free-cooling

coil must be speci ed 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 ef ciency.

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 suf ciently 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 ef ciency, this option can
provide increased redundancy and  exibility 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 humidication systems to

provide the necessary level of moisture
control, higher air supply capacity
and larger coil size.

Standard
Infrared
Humidifier

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

humidication system to provide the necessary level of moisture control.

Humidier makeup
valve controls ow

of water to the

humidier pan.

Pure water
vapor provides
most effective

humidication.

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

12

Standard Infrared Humidifier

Instant Humidication—on when needed, off when not needed.

Optional Steam Generating Canister Humidifier

Utilizes replaceable bottle—requires a specic water quality level for

optimum operation.

Utilizes a drain and rell cycle—to maintain a current setpoint.

Dehumidification Control

The compressors operate at full capacity during dehumidication. The

precision control of the Liebert DS saves energy by tightly regulating

compressor operation and avoiding over dehumidication that causes the
humidier to come on when not needed.

Natural air-gap. No

need for back- ow

prevention.

Auto ush system

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

High water  oat

switch shuts down

humidi er upon

high water.

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

Cleanable stainless

steel humidi er

pan. Removable
from front.

Filtration System

The Liebert® DS™ features integral air  ltration to protect against airborne

contaminants within the critical environment. Without proper air  ltration,

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  lter.

V bank filter arrangement—reduces air pressure drop, top  lter access.

Reheat Function

The reheat function of the Liebert DS is
primarily used to keep the temperature
from going too low during the

dehumidi cation cycle.

Standard Reheat

Three-stage electric reheat—low watt-

density, 304 stainless-steel  n-tubular
reheat, location maximizes air ow to

maximize element life and improve
reliability.

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 Ef ciency, Adaptability

60% Load

70% Load

80% Load

90% Load

Cumulative Compressor Cycles

And Reliable Operation

It Starts With Reliable Scroll
Compressor Technology

The scroll compressor design provides high ef ciency,

low sound levels and excellent durability. The Liebert

®

DS™ precision cooling system is available with either:

A standard  xed-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 ef cient, 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 signi cantly higher
energy ef ciency. In addition to the advantages of the

dependable scroll design, Digital Scroll technology

provides in nitely 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 ef cient than traditional hot­gas bypass. Bene ts include:

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

140000

120000

100000

80000

60000

40000

20000

0

Year 1 Year 2 Year 3 Year 4

Single Compressor

Two CompressorsTwo Compressors

Digital Compressor

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 signi cantly greater

component life than other compressor technologies.

Greater energy savings—variable capacity system

allows maximum load tracking for higher ef ciency.

Improved reliability—by reducing compressor cycling

and component wear.

Improved performance—the compressor can easily

adapt to changing load conditions, providing precise
temperature control.

Digital Scroll
Capa
Diagram

city Control

50% Load

33% Load

7.5 secs

5 secs

15 secs

10 secs

7.5 secs

100%

capacity

0%

capacity

Digital Scroll Capacity
adapts as load changes

10%

Initial Load

Future Load

Load

100%

Capacity

14

Four-Step Semi-Hermetic Compressors:
Proven Performance

®

The Liebert

DS™ Four-Step system achieves high

levels of energy ef ciency through the integration of
two high-ef ciency semi-hermetic compressors with

capacity control valves, an advanced microprocessor
control system and a computer-optimized cooling coil.

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.

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.

Energy Savings

100%

100%

Step Four

Capacity Energy Energy Savings

88%

75%

Step Three Step Two Step One

76%

50%

38%

25%

4-Step Compressor Operation Improves

Energy Ef ciency Ratio

105°F

22.4

R-407C environmentally-friendly refrigerant is the

standard in the Liebert DS.

110°F

115°F

120°F

125°F

Saturated Condensing Temperature

130°F

11.7

45°F

Saturated Evaporator Temperature

12.8

50°F

14.0

55°F

Semi-Hermetic Compressors

15

Operating Standby

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 air ow compensates for
 oor 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.

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

Standby

Operating

Alarm

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  exibility of

control of up to 32 units per zone and
up to 99 zones per network.

16

Teamwork: Mode 2

Units work together to provide precision cooling in rooms with
unbalanced loads.

STANDB Y SETTINGS / LEAD-LAG

to change parameter

to confirm

to select parameter

for next/previous unit
then

SYSTEM

PASSWOR D (Actual Level 0) ????
Number of Standby Unit s 0
Rotation Frequency No
Rotate at ( hour) 00
Rotate at ( minute) 00
Rotate by 1
Perform one Rotation No
Cascade Units No
Start all Standby U nits by HT No

S501
S502
S503
S504
S505
S506
S507
S508
S509
S510
S511

Maintenance /

Large Graphic Display

Wellness Setup

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 identication of parts.

Unit Diary—Free eld 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.

Spare Parts

Unit Diary

Removable display makes
troubleshooting servicing easier.

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

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.

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 oat condensate pump—installed in unit, with

secondary oat to shut down unit and trigger alarm if

high water detected.

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.

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).

Smoke sensor—senses the return air, shuts down the

unit upon detection, and sends visual and audible

™

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.

IntelliSlot
easy plug-in
of optional
communication
cards.

Low voltage
terminal strip
provides
connection

exibility.

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.

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.

Compressor overload—activates an audible and visual

alarm in the event of a compressor overload.

Main Fan Overload—activates an audible and visual

alarm in the event of a motor overload.

for

18

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

CongurationsTo Meet Application Requirements

Liebert Condensers & Drycoolers

Emerson Network Power manufactures its own high-

efciency 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 copper-

tube aluminum-n 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 airows, indoor or outdoor models,
freestanding or ducted congurations.

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 airow.

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

GLYCOOL™ System with free-cooling cool

To Meet Your Critical Needs

No Other Precision Cooling System

Offers This Much Flexibility

Long recognized as the standard in environmental
control systems for data center operations, the Liebert

DS is built to the most demanding speci cations in the

industry with proven components and design.

Water Cooled

Remote
cooling
tower

A-frame
coil

Paradenser

Tubes

Compressors

Liebert® DS™ features compressorized direct expansion
operation in air cooled, water cooled and glycol cooled

con gurations, as well as GLYCOOL™ free-cooling

models and chilled water systems.

Glycol Cooled

Glycol circulating
pump

A-frame
coil

Liebert
drycooler

Compressors

Centrifugal
Blower

Centrifugal
Blower

Air Cooled

Condenser
with optional
Lee-Temp
Package

GLYCOOL™ System with free-cooling cool

Glycol

circulating

pump

Liebert
drycooler

Paradenser

Tubes

Compressors

A-frame coil inside

Centrifugal
Blower

Glycol-cooled
condensers

Econ-o­coil rests
on
A-frame
coil

Piggyback Heat Rejection Configurations

Air-cooled or
Glycol-cooled
configurations
available

Fan

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

con guration and installation requirements. It features a

built-in LCD user interface, making the panel self contained
and accessible without additional hardware and software.

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 con gurations are available for monitoring up to

eight points with communications and pager interface plus
eight digital outputs.

Liqui-tect 410 Point Leak Detection Con guration

Liqui-tect 460 Zone Leak Detection Con guration

Liebert Universal Monitor

22

Liebert Leak Detection Modules

Liebert Liqui-tect® leak detection systems
provide quick sensing and accurate reporting

of leaks below the  oor or above the ceiling

in critical facilities. These reliable systems
provide immediate warning and precise

location, allowing you to  nd and correct a

leak before moisture can damage computers,
wiring connections or other sensitive
electronics.

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 ef ciency.

Maximizing Your Investment Through Adaptive Monitoring

Distributed Management With
Liebert IntelliSlot

For enchanced remote communications
and control of your Liebert units, the
Liebert IntelliSlot Web and 485 Cards
deliver the communication capabilities
you require.

Monitoring and control through your
existing Network with no additional
software required.

Each Liebert system equipped with an
Liebert IntelliSlot Web Card takes full
advantage of your Ethernet network,
allowing remote monitoring from your
computer desktop, network operations
center or wherever network access is
permitted, without the need for front­end software.

Monitoring integration with your
existing Building Management
System.

A Liebert system equipped with an
IntelliSlot 485 Card can be seamlessly
integrated with your existing Building
Management System.

®

Interface Cards

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
distributed critical space is only part of
the monitoring challenge.

Liebert Nform leverages the
network connectivity capabilities of
your Liebert equipment to provide a
centralized monitoring view of your
distributed equipment.

Utilizing the SNMP and Web
technologies built into each of the
Liebert IntelliSlot communication
cards, Nform will centrally manage

alarm notications to provide you

with an easy interface to access critical
status information.

Liebert Nform puts critical systems

information at the ngertips of

support personnel—wherever they
are—increasing responsiveness to
alarm-event conditions, thus allowing
IT organizations to maximize their
system availability.

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 IntelliSlot Web Liebert Nform

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.)

[e-mail]

Emerson Network Power

Caribbean and Latin America

Office – United States of America

[phone] Phone

[e-mail]

Emerson Network Power Canada

3580 Laird Rd Unit 1

Mississauga

Ontario L5L 5Z7

[e-mail]

[phone]

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

© 2014 Liebert Corporation. All rights reserved

throughout the world. Specications subject to change

Emerson Network Power and the Emerson Network

Power logo are trademarks and service marks of

SL- 18810 (R08/14) Printed in USA

Liebert Corporation.

without notice.

Emerson Electric Co.

©2014 Emerson Electric Co.