Vertiv Liebert DSE User manual

Liebert®
DSE™ ThermalManagementSystem
System Design and User Manual
Downflow, 250 kW (71 ton) Capacity, 50and60Hz

Vertiv | Liebert® DSE™ System Design and User Guide
Technical Support Site
If you encounter any installation or operational issues with your product, check the pertinent
section of this manual to see if the issue can be resolved by following outlined procedures.
Visit https://www.VertivCo.com/en-us/support/ for additional assistance.
The information contained in this document is subject to change
without notice and may not be suitable for all applications. While
every precaution has been taken to ensure the accuracy and
completeness of this document, Vertiv assumes no responsibility
and disclaims all liability for damages resulting from use of this
information or for any errors or omissions. Refer to other local
practices or building codes as applicable for the correct methods,
tools, and materials to be used in performing procedures not
specifically described in this document.
The products covered by this instruction manual are manufactured
and/or sold by Vertiv This document is the property of Vertiv and
contains confidential and proprietary information owned by Vertiv.
Any copying, use or disclosure of it without the written permission
of Vertiv is strictly prohibited.
Names of companies and products are trademarks or registered
trademarks of the respective companies. Any questions regarding
usage of trademark names should be directed to the original
manufacturer.

TABLE OF CONTENTS
1 Important Safety Instructions 5
2 Nomenclature and Components 11
2.1 Liebert DSE Model-number Nomenclature 11
2.2 Component Location 13
2.3 Blower Configurations 14
3 System Data 17
3.1 Capacity and Performance Data 17
3.2 Physical Data 18
4 Planning Guidelines 21
4.1 Shipping Dimensions and Unit Weights 21
4.2 Planning Dimensions 21
5 Pre-installation PreparationandGuidelines 23
5.1 Planning Dimensions 23
5.2 Connections and System Setup 23
5.3 Operating Conditions 23
5.3.1 Humidification Control 23
6 Equipment Inspection and Handling 25
6.1 Packaging Material 25
6.2 Handling the Unit while Packaged 26
6.3 Unpacking the Unit 27
6.4 Removing the Unit from the Skid 28
6.5 Unpacking and Handling the Fan Section 31
7 Electrical Requirements 33
7.1 Indoor-unit Electrical Power Requirements 33
7.2 Electrical Field Connections 33
8 Piping and Refrigerant Requirements 37
8.1 Drain Fluid Piping 37
8.1.1 Field-installed, Gravity-fed Drain Line Requirements 38
8.1.2 Condensate-pump Drain Line Requirements 38
8.2 Refrigerant Piping and Charging 39
8.2.1 Refrigerant Piping Guidelines forAir-cooledSystems 40
8.2.2 Piping Layout and Condenser Positioning 40
8.2.3 Refrigerant Line Sizes and Equivalent Lengths 41
8.2.4 Refrigerant Charge Requirements for Air-cooled Systems 41
8.2.5 Additional Oil Requirements forScrollandDigital-scrollCompressors 42
8.2.6 Evacuation, Leak-testing, and Charging Air-cooled Systems 44
9 Heat-rejection Skid 47
9.1 Planning Dimensions 47
9.2 Liebert MCV Match-up Selections 47
9.3 Liebert MCV Electrical Power Requirements 47
9.4 Liebert MCV Connection Locations 48
10 Checklist for Completed Installation 49
10.1 Moving and Placing Equipment 49
10.2 Electrical Installation Checks 49
10.3 Piping Installation Checks 49
10.4 Other Installation Checks 49
11 Initial Start-up Checks andCommissioningProcedure forWarrantyInspection 51
Vertiv | Liebert® DSE™ System Design and User Guide | 3

12 Maintenance 53
12.1 Filters 53
12.1.1 Replacing the Filters 54
12.2 Fan Maintenance 55
12.2.1 Fan Assembly Troubleshooting 55
12.2.2 Fan Impellers 56
12.2.3 Blower-motor Lubrication 56
12.2.4 Removing Fan Assembly 56
12.3 Condensate-drain and Condensate-pump System Maintenance 56
12.3.1 Condensate Drain 56
12.3.2 Condensate Pump 57
12.4 Electronic Expansion Valve (EEV) Maintenance 57
12.5 Compressor Maintenance 57
12.5.1 Compressor Oil 57
12.5.2 Rotalock Valve 58
12.5.3 Replacement Compressors 58
12.5.4 Compressor Motor Burnout 58
12.5.5 Unloading Solenoid(s) on a Digital-scroll Compressor 58
12.5.6 Replacing the Compressor 59
12.6 Evaporator Coil 59
12.7 Air-Cooled Condenser Maintenance 60
13 Preventive Maintenance Checklist 61
Appendices 65
Appendix A: Technical Support and Contacts 65
Appendix B: Submittal Drawings 67
Appendix C: Guide Specifications 69
Vertiv | Liebert® DSE™ System Design and User Guide | 4

1 IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This manual contains important safety instructions that should be followed during the installation and
maintenance of the Liebert®DSE. Read this manual thoroughly before attempting to install or operate
this unit.
Only qualified personnel should move, install or service this equipment.
Adhere to all warnings, cautions, notices and installation, operating and safety instructions on the unit
and in this manual. Follow all installation, operation and maintenance instructions and all applicable
national and local building, electrical and plumbing codes.
WARNING! Arc flash and electric shock hazard. Open all local and remote electric power-supply
disconnect switches, verify with a voltmeter that power is Off and wear appropriate,
OSHA-approved personal protective equipment (PPE) per NFPA 70E before working within the
electric control enclosure. Failure to comply can cause serious injury or death. Customer must
provide earth ground to unit, per NEC, CEC and local codes, as applicable. Before proceeding
with installation, read all instructions, verify that all the parts are included and check the
nameplate to be sure the voltage matches available utility power. The Liebert® controller does
not isolate power from the unit, even in the “Unit Off” mode. Some internal components require
and receive power even during the “Unit Off” mode of the controller. The factory-supplied
disconnect switch is inside the unit. The line side of this switch contains live high-voltage. The
only way to ensure that there is NO voltage inside the unit is to install and open a remote
disconnect switch. Refer to unit electrical schematic. Follow all local codes.
WARNING! Risk of electric shock. Can cause serious injury or death. Open all local and remote
electric power supply disconnect switches and verify with a voltmeter that power is off before
working within the component electric-connection enclosures. Fan-motor controls can
maintain an electric charge for 10 minutes after power is disconnected. Wait 10 minutes after
power is verified as off before working within the VFD electric control/connection enclosures.
WARNING! Risk of over-pressurization of the refrigeration system. Can cause explosive
discharge of high-pressure refrigerant, loss of refrigerant, environmental pollution, equipment
damage, injury, or death. This unit contains fluids and gases under high pressure. Use extreme
caution when charging the refrigerant system. Do not pressurize the system higher than the
design pressure marked on the unit's nameplate. For systems requiring EU CE compliance
(50Hz), the system installer must provide and install a pressure relief valve in the high side
refrigerant circuit that is rated same as the refrigerant high side “Max Allowable Pressure”
rating that is marked on the unit serial tag. Do not install a shutoff valve between the
compressor and the field installed relief valve. The pressure relief valve must be CE-certified to
the EU Pressure Equipment Directive by an EU “Notified Body.”
WARNING! Risk of very heavy 125-lb (56.7-kg) fan modules dropping downward suddenly. Can
cause injury or death.
Support fan modules before removing mounting hardware. Use caution to keep body parts out
of the fan modules pathway during repositioning. Only properly trained and qualified personnel
should work on this equipment.
1 Important Safety Instructions 5

WARNING! Risk of improper moving. Can cause equipment damage, injury or death. Use only
lifting equipment that is rated for the unit weight by an OSHA-certified rating organization. The
center of gravity varies depending on the unit size and selected options. The slings must be
equally spaced on either side of the center of gravity indicator.
Unit weights are listed in Shipping Dimensions and Unit Weights on page21. Use the center of
gravity indicators on the unit to determine the position of the slings.
WARNING! Risk of contact with high-speed rotating fan blades. Can cause serious injury or
death. Open all local and remote electric power-supply disconnect switches, verify with a
voltmeter that power is off, and verify that all fan blades have stopped rotating before working
in the unit cabinet or on the fan assembly. If control voltage is applied, the fan motor can restart
without warning after a power failure.
WARNING! Risk of improper wiring, piping, moving, lifting and handling. Can cause equipment
damage, serious injury or death. Installation and service of this equipment should be done only
by qualified personnel who have been specially-trained in the installation of air-conditioning
equipment and who are wearing appropriate, OSHA-approved PPE.
WARNING! Risk of improper wire sizing/rating and loose electrical connections. Can cause
overheated wire and electrical connection terminals resulting in smoke, fire, equipment and
building damage, injury or death. Use correctly sized copper wire only and verify that all
electrical connections are tight before turning power On. Check all electrical connections
periodically and tighten as necessary.
CAUTION: Risk of contact with sharp edges, splinters, and exposed fasteners. Can cause
injury. Only properly trained and qualified personnel wearing appropriate, OSHA-approved PPE
should attempt to move, lift, remove packaging from or prepare the unit for installation.
CAUTION: Risk of contact with hot surfaces. Can cause injury. The compressor, refrigerant
discharge lines, fan motor, and some electrical components are extremely hot during unit
operation. Allow sufficient time for them to cool to a touch-safe temperature before working
within the unit cabinet. Use extreme caution and wear appropriate, OSHA-approved PPE when
working on or near hot components.
CAUTION: Risk of handling heavy and lengthy parts. Can cause personal injury and equipment
damage. Cabinet panels can exceed 5 ft. (1.5 m) in length and weigh more than 35 lb. (15.9 kg).
Follow relevant OSHA lifting recommendations and consider using a two-person lift for safe
and comfortable removal and installation of cabinet panels. Only properly trained and qualified
personnel wearing appropriate, OSHA-approved PPE should attempt to remove or install
cabinet panels.
Vertiv | Liebert® DSE™ System Design and User Guide
6

CAUTION: Risk of improper moving, lifting and handling. Can cause equipment damage or
injury. Only properly trained and qualified personnel should work on this equipment. an
modules . Use proper lifting techniques and wear appropriate, OSHA-approved PPE to avoid
injury and dropping the fan module during removal. Equipment used in handling/lifting, and/or
installing the fan assembly must meet OSHA requirements. Use handling/lifting equipment
rated for the weight of the fan assembly. Use ladders rated for the weight of the fan assembly
and technicians if used during installation. Refer to handling/lifting, and/or installation
equipment operating manual for manufacturer's safety requirements and operating
procedures.
CAUTION: Risk of exposure to harmful noise levels. Can cause hearing injury or loss.
Depending on the installation and operating conditions, a sound pressure level greater than
70dB(A) may arise. Take appropriate technical safety measures. Operating personnel must
wear appropriate, OSHA-approved PPE and observe all appropriate hearing-protection safety
requirements.
NOTICE
Risk of improper power-supply connection. Can cause equipment damage and loss of warranty
coverage.
Prior to connecting any equipment to a main or alternate power source (for example: back-up
generator systems) for start-up, commissioning, testing, or normal operation, ensure that these
sources are correctly adjusted to the nameplate voltage and frequency of all equipment to be
connected. In general, power-source voltages should be stabilized and regulated to within
±10% of the load nameplate nominal voltage. Also, ensure that no three-phase sources are
single-phased at any time.
NOTICE
Risk of oil contamination with water. Can cause equipment damage.
Liebert®DSE systems require the use of POE (polyolester) oil. POE oil absorbs water at a much
faster rate when exposed to air than previously used oils. Because water is the enemy of a
reliable refrigeration system, extreme care must be used when opening systems during
installation or service. If water is absorbed into the POE oil, it will not be easily removed and will
not be removed through the normal evacuation process. If the oil is too wet, it may require an oil
change. POE oils also have a property that makes them act as a solvent in a refrigeration
system. Maintaining system cleanliness is extremely important because the oil will tend to
bring any foreign matter back to the compressor.
NOTICE
Risk of improper refrigerant charging. Can cause equipment damage.
Refrigerant charge must be weighed into air-cooled compressorized systems before they are
started. Starting digital scroll compressors without proper refrigerant charging can cause the
compressors to operate at less than 5°F (–15°C) evaporator temperature and at less than
52psig(358kPa). Operation for extended periods at less than 52psig(358kPa) can cause
premature compressor failure.
1 Important Safety Instructions 7

NOTICE
Risk of clogged or leaking drain lines and leaking water-supply lines. Can cause equipment and
building damage.
This unit requires a water drain connection. Drain lines must be inspected at start-up and
periodically, and maintenance must be performed to ensure that drain water runs freely
through the drain system and that lines are clear and free of obstructions and in good
condition with no visible sign of damage or leaks. This unit may also require an external water
supply to operate.
Improper installation, application and service practices can result in water leakage from the
unit. Water leakage can result in catastrophic and expensive building and equipment damage
and loss of critical data center equipment.
Do not locate unit directly above any equipment that could sustain water damage.
We recommend installing a monitored fluid-detection system to immediately discover and
report coolant-fluid system and condensate drain-line leaks.
NOTICE
Do not install an external trap in the drain line. This line already has a factory-installed trap
inside the cabinet. Installation of a second trap will prevent drain-water flow and will cause the
water to overflow the drain pan. Sagging condensate drain lines may inadvertently cause an
external trap.
NOTICE
Risk of doorway/hallway interference. Can cause unit and/or structure damage. The unit may
be too large to fit through a doorway or hallway while on the skid. Measure the unit and
passageway dimensions, and refer to the installation plans prior to moving the unit to verify
clearances.
NOTICE
Risk of damage from forklift. Can cause unit damage. Keep tines of the forklift level and at a
height suitable to fit below the skid and/or unit to prevent exterior and/or underside damage.
NOTICE
Risk of improper storage. Can cause unit damage.
Keep the unit upright, indoors and protected from dampness, freezing temperatures and
contact damage.
NOTE: The Liebert® indoor cooling unit has a factory-installed, high-pressure safety switch in the high-
side refrigerant circuit. Each refrigerant receiver contains a fusible plug for fire-safety purposes.
Consult your local building code to determine whether the refrigerant piping will require additional,
field-provided pressure-relief devices.
Vertiv | Liebert® DSE™ System Design and User Guide
8

NOTICE TO EUROPEAN UNION CUSTOMERS: DISPOSAL OF OLD APPLIANCES—This product uses
components that are dangerous for the environment, such as electronic cards and other electronic
components. Any component that is removed must be take to specialized collection and disposal centers.
If this unit must be dismantled, this must be done by a specialized center for collection and disposal of
electric and electrical appliances or other dangerous substances.
This product has been supplied from an environmentally aware manufacturer that complies with the
Waste Electrical and Electronic Equipment (WEEE) Directive 2012/19/CE.
The “crossed-out wheelie bin” symbol is placed on this product to encourage you to recycle wherever
possible. Please be environmentally responsible and recycle this product through your recycling facility at
its end of life. Do not dispose of this product as unsorted municipal waste. Follow local municipal waste
ordinances for proper disposal provisions to reduce the environmental impact of waste electrical and
electronic equipment (WEEE).
For information regarding the scrapping of this equipment, please browse www.VertivCo.com or call our
worldwide technical support.
•Toll Free: 00 80011554499
•Toll Number Based in Italy: [phone]
1 Important Safety Instructions 9

Vertiv | Liebert® DSE™ System Design and User Guide
10
This page intentionally left blank

2 NOMENCLATURE AND COMPONENTS
This section describes the model-number configuration for Liebert® DSE units and components.
2.1 Liebert DSE Model-number Nomenclature
2.1 above describes each digit of the model number.
Model Number Digits 1 to 10 Model Details Model Number Digits 11 to
14
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
D A 2 5 0 D P 3 A T 0 2 0 8 1 1 L 0 B 0 P 1 2 3 S
Table 2.1 DSE Model Number
Digit Description
Digits 1 and 2 = Product Family
DA = Liebert® DSE
Digit 3, 4, 5 = Nominal Cooling Capacity, kW
250 = 250 kW
Digit 6 = Air Discharge
D = Downflow, bottom discharge
H = Downflow, horizontal discharge
Digit 7 = System Type
P = Air-cooled, Econ-O-Phase ready
Digit 8 = Air-flow (Fan Type)
3 = Direct-drive + VFD (plenum)
Digit 9 = Voltage
A = 460V - 3ph - 60Hz
B = 575V - 3ph - 60Hz
G = 415 V - 3ph - 50Hz
*For applications that require less than 400V/3ph/50Hz, please consult your local sales office for assistance.
Digit 10 = Cooling System
T = Tandem with digital scroll, R-410A
P = Tandem with digital scroll, R-410A with Power Factor Correction
Digit 11 = Humidifier
0 = No humidifier
Digit 12 = Display
2 = iCOM (High Definition)
Digit 13 = Reheat
0 = None
Table 2.2 DSE Model-number Digit Definitions
2 Nomenclature and Components 11

Digit Description
Digit 14 = Air Filter
8 = MERV 8, 4-in.
9 = MERV 11, 4-in..
Digit 15 = Coil Option
1 = Non-coated coil, indoor unit
2 = Coated coil, indoor unit
Digit 16 = Enclosure Option
1 = Color standard
2 = Color optional
Digit 17 = High-voltage option
L = Locking disconnect
5 = Locking disconnect, with condensate pump
S = Dual locking disconnect with reversing starter and condenser sub-feed
9 = Dual locking disconnect with reversing starter with condensate-pump and condenser sub-feed
Digit 18 = Option packages
0 = None
L = Option package #1 - low-voltage terminal package
R = Remote humidifier contact
Digit 19 = Monitoring
B = Base comms and connectivity
Digit 20 = Sensors
0 = None
H = High-temperature sensor
C = Compressor-overload sensors
A = Compressor, high-temperature sensors
Digit 21 = Packaging
P = Domestic
C = Export
Digit 22-24 = Factory Configuration Number
Digit 25 = Configuration Code
A = 1
S = Special-feature authorization (SFA). A non-standard configuration or feature of the product that requires the local
factory representative to work directly with the factory.
Table 2.2 DSE Model-number Digit Definitions (continued)
Vertiv | Liebert® DSE™ System Design and User Guide
12

2.2 Component Location
The unit component locations are described in the submittal documents included in the Submittal
Drawings on page67.
The following table lists the relevant documents by number and title.
Document Number Title
DPN004368 Component Location, Typical, Downflow, Horizontal-discharge Models, DA250
DPN004258 Component Location, Typical, MCV440 (8-fan)
DPN004260 Component Location, Typical, MCV440 (16-fan)
Table 2.3 Component-location Drawings
2 Nomenclature and Components 13

2.3 Blower Configurations
Figure 2.1 Downflow, horizontal-discharge blower configurations with EC fans
Vertiv | Liebert® DSE™ System Design and User Guide
14

Figure 2.2 Downflow, bottom-discharge blower configurations with EC fans
2 Nomenclature and Components 15

Vertiv | Liebert® DSE™ System Design and User Guide
16
This page intentionally left blank

3 SYSTEM DATA
3.1 Capacity and Performance Data
Air-side
∆T
Supply-air
Temperature
Return-air
Temperature
Outdoor
Temperature Air flow6Net Sensible Capacity
Input
Power SCOP
°F °F °C °F °C °F °C CFM CMH kW kBtu/hr kW –
20
70 21 90 32 95 35 40,500 68,810 248.4 848 97 2.6
74 23 94 34 95 35 43,000 73,057 259.7 886 101.5 2.6
25
70 21 95 35 95 35 34,000 57,766 258.5 882 88.3 2.9
74 23 99 37 95 35 36,000 61,164 272 928 91.8 3
1. Total Cooling Capacity is not shown because the DA250 is 100% sensible.
2. Capacity data is rated and factory certified per ASHRAE 127-2007 with a 5% tolerance.
3. For downflow, bottom-discharge options, consult the factory.
4. Quantity of Fans is 3, External Static pressure 0.1in. and Dewpoint of 52.3°F.
5. For return-air temperatures outside the range shown, please consult factory.
6. Maximum air-flow calibration voltage must be adjusted based on the required air flow. See Table 3.4 on the next page,
for values.
Table 3.1 Capacity data for 60-Hz, Downflow, horizontal-discharge models
Air-side
∆T
Supply-air
Temperature
Return-air
Temperature
Outdoor
Temperature Air flow6Net Sensible Capacity
Input
Power SCOP
°F °F °C °F °C °F °C CFM CMH kW kBtu/hr kW –
20
70 21 90 32 95 35 36,000 61,165 220 751 74.1 3.0
74 23 94 34 95 35 38,000 64,560 231 788 77.4 3.0
25
70 21 95 35 95 35 30,600 52,000 232 792 68.0 3.4
74 23 99 37 95 35 32,500 55,225 243 829 70.5 3.5
1. Total Cooling Capacity is not shown because the DA250 is 100% sensible.
2. Capacity data is rated and factory certified per ASHRAE 127-2007 with a 5% tolerance.
3. For downflow, bottom-discharge options, consult the factory.
4. Quantity of Fans is 3, External Static pressure 0.1in. and Dewpoint of 52.3°F.
5. For return-air temperatures outside the range shown, please consult factory.
6. Maximum air-flow calibration voltage must be adjusted based on the required air flow. See Table 3.4 on the next page,
for values.
Table 3.2 Capacity data for 50-Hz, Downflow, horizontal-discharge models
3 System Data 17

3.2 Physical Data
Model Size DA250, Downflow, Horizontal Discharge
EVAPORATOR COIL- Copper Tube/Aluminum Fin
Face Area, sq. ft. (sq. m) 67.5 (6.27)
Rows of Coil 4
Face Velocity, FPM (m/s), Std. Air Volume
520ft/min (158.5 m/s) based on 35,000 CFM (5946 CMH)
540 ft/min (165m/s) based on 36,500 CFM (62,013 CMH)
622 ft/min (189m/s) based on 42,000 CFM (71,358 CMH)
FILTER SECTION - Disposable Type - Nominal Sizes and Quantities
Nominal Size, inches 28 x 22 x 4
Quantity 15
UNIT PIPING CONNECTION SIZES (not external line sizes)
Condensate Drain
w/opt Condensate Pump, OD 1/2-in. O.D. Cu
Condensate Drain, FTP 3/4 in.
Liquid Line, O.D. Cu 1-3/8 in. O.D. Cu
Hot Gas Line, O.D. Cu 1-5/8 in. O.D. Cu
Table 3.3 Physical data for 60/50-Hz models
Air flow* at 0.1in.(25Pa) ESP Air-flow calibration voltage
CFM CMH 60 Hz 50 Hz
25,000 42480 4.66 5.57
26,000 44179 4.83 5.78
27,000 45878 5.00 5.98
28,000 47578 5.17 6.19
29,000 49277 5.34 6.39
30,000 50976 5.52 6.60
31,000 52675 5.69 6.81
32,000 54374 5.86 7.01
33,000 56074 6.03 7.22
34,000 57773 6.20 7.42
35,000 59472 6.38 7.63
36,000 61171 6.55 7.83
37,000 62870 6.72 8.04
38,000 64570 6.89 8.24
39,000 66269 7.06 8.45
Table 3.4 Air-flow Calibration Voltage
Vertiv | Liebert® DSE™ System Design and User Guide
18

Air flow* at 0.1in.(25Pa) ESP Air-flow calibration voltage
CFM CMH 60 Hz 50 Hz
40,000 67968 7.23 8.65
41,000 69667 7.41 8.86
42,000 71366 7.58 9.07
43,000 73066 7.75 9.27
44,000 74765 7.92 9.48
*Maximum air-flow calibration voltage must be adjusted based on the required air flow.
Table 3.4 Air-flow Calibration Voltage (continued)
3 System Data 19

Vertiv | Liebert® DSE™ System Design and User Guide
20
This page intentionally left blank