Vertiv DSE Thermal Management System User Manual

Liebert®

DSE ThermalManagementSystem

Installer/User Guide

Downflow, 250 kW (71 ton) and 265 kW (75 ton) Capacity, 50and60Hz

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.

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.Vertiv.com/en-us/support/ for additional assistance.

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

TABLE OF CONTENTS

1 Important Safety Instructions 1

2 Nomenclature and Components 7

2.1 Liebert® DSE Model Number Nomenclature 7

2.2 Component Location 9

3 Pre-installation PreparationandGuidelines 11

3.1 Planning Dimensions 11

3.2 Connections and System Setup 12

3.3 Operating Conditions 12

3.3.1 Humidification Control 12

3.4 Shipping Dimensions and Unit Weights 12

4 Equipment Inspection and Handling 15

4.1 Packaging Material 15

4.2 Handling the Unit while Packaged 16

4.3 Unpacking the Unit 16

4.4 Removing the Unit from the Skid 17

4.5 Unpacking and Handling the Fan Section 20

5 Electrical Field Connections 21

6 Piping and Refrigerant Requirements 23

6.1 Drain Fluid Piping 24

6.1.1 Field Installed, Gravity Fed Drain Line Requirements 24

6.1.2 Condensate Pump Drain Line Requirements 26

6.2 Refrigerant Piping and Charging 26

6.2.1 Refrigerant Piping Guidelines forAir CooledSystems 27

6.2.2 Piping Layout and Condenser Positioning 28

6.2.3 Refrigerant Line Sizes and Equivalent Lengths 28

6.2.4 Refrigerant Charge Requirements for Air Cooled Systems 29

6.2.5 Additional Oil Requirements forScrollandDigital ScrollCompressors 30

6.2.6 Evacuation, Leak Testing, and Charging Air Cooled Systems 32

7 Checklist for Completed Installation 37

7.1 Moving and Placing Equipment 37

7.2 Electrical Installation Checks 37

7.3 Piping Installation Checks 37

7.4 Other Installation Checks 37

8 Initial Startup Checks andCommissioningProcedure forWarrantyInspection 41

9 Maintenance 43

9.1 Filters 44

9.1.1 Replacing the Filters 44

9.2 Fan Maintenance 45

9.2.1 Fan Assembly Troubleshooting 45

9.2.2 Fan Impellers 46

Vertiv | Liebert® DSE Thermal Management System Installer/User Guide | i

9.2.3 Blower Motor Lubrication 46

9.2.4 Removing Fan Assembly 46

9.3 Condensate Drain and Condensate Pump System Maintenance 46

9.3.1 Condensate Drain 46

9.3.2 Condensate Pump 46

9.4 Electronic Expansion Valve (EEV) Maintenance 47

9.5 Compressor Maintenance 47

9.5.1 Compressor Oil 47

9.5.2 Replacement Compressors 48

9.5.3 Rotalock Valve on Digital Scroll Compressors 48

9.5.4 Unloading Solenoid(s) on a Digital Scroll Compressor 48

9.5.5 Compressor Electrical Failure (Motor Burnout) 49

9.5.6 Replacing a Compressor with Electrical Failure (MotorBurnout) 49

9.5.7 Compressor Mechanical Failure 49

9.5.8 Replacing a Compressor with Mechanical Failure 50

9.6 Evaporator Coil 50

9.7 Air Cooled Condenser Maintenance 51

10 Preventive Maintenance Checklist 53

Appendices 59

Appendix A: Technical Support and Contacts 59

Appendix B: Submittal Drawings 61

Vertiv | Liebert® DSE Thermal Management System Installer/User Guide | ii

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 equipment damage, 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
any electric connection enclosures. Service and maintenance work must be performed only by properly
trained and qualified personnel and in accordance with applicable regulations and manufacturers’
specifications. Opening or removing the covers to any equipment may expose personnel to lethal voltages
within the unit even when it is apparently not operating and the input wiring is disconnected from the
electrical source.

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 fan motor
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. Use only fully trained and qualified HVAC technicians to perform
maintenance on the fans.

WARNING! Risk of electric shock. Can cause injury or death. Open all local and remote electric power supply
disconnect switches and verify that power is Off with a voltmeter before working within the condensate
pump electrical connection enclosure. The Liebert® iCOM™ 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
Liebert®iCOM™.

1 Importan t Safety Ins tructions

1

WARNING! Risk of electric shock. Can cause serious injury or death. The Liebert® iCOM™ microprocessor
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 Liebert® iCOM™ control. Open all local and remote electric
power disconnect switches and verify with a voltmeter that power is Off before working on any component of
the system.

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 opening the fan motor
electric connection enclosure. Use only fully trained and qualified HVAC technicians to replace or perform
maintenance on the EC fans.

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.

WARNING! Risk of very heavy 350 lb. (56.7kg) 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.

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.

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. Do not operate the
unit with any or all cabinet panels removed.

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.

2

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

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.

WARNING! Risk of top heavy unit falling over. Improper handling can cause equipment damage, injury or
death. Read all of the following instructions and verify that all lifting and moving equipment is rated for the
weight of the unit before attempting to move, lift, remove packaging from or prepare the unit for installation.

WARNING! Risk of wiring damage, short circuits and electric shock. Can cause overheated wiring, smoke, fire,
activation of fire suppression systems and EMS personnel and equipment, building and equipment damage,
injury or death. Insert CSA certified or UL listed bushings into holes and or knockouts used to route wiring
through metal panels to protect the wire insulation from contact with sheet metal edges.

CAUTION: Risk of explosive discharge of high pressure refrigerant. Can cause serious injury. Neutral and
service ports on the rotalock valve do not have a valve core. Front seat the service valves and relieve pressure
from the compressor before loosening a part or a component attached to the service valve. Follow local codes
to properly reclaim refrigerant.

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, OSHA­approved PPE should attempt to remove or install cabinet panels.

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.

1 Importan t Safety Ins tructions

3

NOTICE

NOTICE

CAUTION: Risk of excessive refrigerant line pressure. Can cause tubing and component rupture resulting in
equipment damage and personal injury. Do not close off the refrigerant-line isolation valve for repairs unless
a pressure relief valve is field installed in the line between the isolation valve and the check valve. The
pressure relief valve must be rated 5% to 10% higher than the system design pressure. An increase in
ambient temperature can cause the pressure of the isolated refrigerant to rise and exceed the system design
pressure rating (marked on the unit nameplate).

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: backup generator
systems) for startup, 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.

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.

4

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

NOTICE

NOTICE

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 startup 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.

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.

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.

1 Importan t Safety Ins tructions

5

This page intentionally left blank

6

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

2 NOMENCLATURE AND COMPONENTS

This section describes the model number for Liebert® DSE units and components.

2.1 Liebert® DSE Model Number Nomenclature

Table 2.2 below describes each digit of the model number.

Table 2.1 DSE Model Number

ModelNumber Digits 1 to 10 ModelDetails ModelNumber Digits 1 1 t o 14

1 2 3 4 5 6 7 8 9 10 11 12 1 3 14 15 1 6 17 18 1 9 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 2.2 DSE Model Number Digit Definitions

Digit Description

Digits 1 and 2 = Product Family

DA = Liebert®DSE

Digit3, 4, 5 = Nominal Cooling Capacity, kW

250 = 250 kW

265 = 265 kW

Digit6 = Air Discharge

D = Downflow, bottom discharge

H = Downflow, horizontal discharge

Digit7 = System Type

P = Air cooled, Econ-O-Phase ready

Digit8 = Airflow (Fan Type)

3 = Direct-drive + VFD (plenum)

Digit9 = 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 loca l sales office for assistance.

Digit10 = Cooling System

T = Tandem with digital scroll, R-410A

P = Ta ndem with digital scroll, R-410A with Power Factor Correction

Digit11 = Humidifier

0 = N o humidifier

Digit12 = Display

2 = Liebert® iCOM™ (High Definition)

2 Nomenclature and Components

7

Table 2.2 DSE Model Number Digit Definitions (continued)

Digit Description

Digit13 = Reheat

0 = N one

Digit14 = Air Filter

8 = MERV 8, 4 in .

9 = MERV 11, 4 in .

Digit15 = Coil Option

1 = Non-coated coil, indoor unit

2 = Coated coil, indoor unit

Digit16 = Enclosure Option

1 = Color standard

2 = Color optional

Digit17 = High voltage option

L = Locking disconnect

5 = Locking disconnect, with condensate pump

S = Dual locking disconnect with reversing starter and condenser subfeed

9 = Dual locking disconnect with reversing starter with condensate pump and condenser subfeed

Digit18 = Option packages

0 = N one

L = Option package #1 - low voltage terminal package contact

D = Low Voltage Terminal Package and Remote Humidifier Contact

Digit19 = Monitoring

B = Base comms and connectivity

Digit20 = Sensors

0 = N one

H = High Temperature Sensor

S = Smoke Sensor

F = Smoke Sensor and High Temperature Sensor

Digit21 = Pa ckaging

P = Domestic

C = Export

Digit22-24 = Factory Configuration Number

Digit25 = Configuration Code

A = No SFAs (Any alpha letter except S)

S = Special fea ture authorization (SFA). A non-standard configuration or feature of the product that requires the local factory
representative to work directly with the fa ctory.

8

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

2.2 Component Location

The unit component locations are described in the submittal documents included in the Submittal Drawings.

The following table lists the relevant documents by number and title.

Table 2.3 Component Location Drawings

Docu ment Num ber Title

DPN004368 Liebert®DSECabinet Dimension Data DA250, DA265 with Horizontal Discharge

2 Nomenclature and Components

9

This page intentionally left blank

10

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

3 PRE-INSTALLATION PREPARATIONANDGUIDELINES

NOTE: Before installing unit, determine whether any building alterations are required to run piping, wiring and duct
work. Follow all unit dimensional drawings and refer to the submittal engineering dimensional drawings of individual
units for proper clearances.

Refer to DSE Model Number Digit Definitions, and submittal drawings to determine the type of system being installed and
anticipate building alterations, piping and duct work needed.

The unit dimensions, pipe connection locations, and piping schematics are described in the submittal documents included
in the Submittal Drawings.

• Verify that the floor is level, solid and sufficient to support the unit. See Shipping Dimensions and Unit Weights
on the next page for unit weights.

• Confirm that the room is properly insulated and has a sealed vapor barrier.

• For proper humidity control, keep outside or fresh air to an absolute minimum (less than 5% of total air
circulated in the room).

• Do not install a Liebert® DSE in an alcove or at the end of a long, narrow room.

• Install the units as close as possible to the largest heat load.

• Allow at least the minimum recommended clearances for maintenance and service. See the appropriate
submittal drawings for dimensions.

We recommend installing an under floor water detection system. Contact your Vertiv representative for information.

3.1 Planning Dimensions

The unit, floor stand, and plenum dimensions are described in the submittal documents included in the Submittal Drawings.

The following table lists the relevant documents by number and title.

Table 3.1 Dimension Planning Drawings

Docu ment Num ber Title

Downflow Units

DPN004366 Liebert®DSE Cabinet Dimensional Data DA250, DA265 with Horizontal Discharge

DPN004516 Liebert® DSE Cabinet Dimensional Data DA250, DA265 with Bottom Discharge

DPN004514 Liebert® DSE Installation and Service Clearance Data DA250, DA265

DPN004581 Liebert® DSE Floor Planning for Adjacent DA250, DA265 Units

Floor Stands

DPN004511 Liebert®DSE Floor Stand Dimensional Data DA250, DA265

3 Pr e-installation PreparationandG uidelin es

11

3.2 Connections and System Setup

• The unit requires a drain, which must comply with all applicable codes. See Connections and System Setup
above, for details.

• If seismic requirements apply, consult your Vertiv representative for information about a seismic rated floor
stand.

NOTE: Seal openings around electrical connection to prevent air leakage. Failure to do so could reduce the unit’s
cooling performance.

The Liebert® DSE controls superheat with an electronic expansion valve (EEV). The EEV controller adjusts the orifice based
on suction pressure and temperature. The EEV control will drive the valve to maintain the superheat setpoint, set in the
Liebert® iCOM™, using a Proportional, Integral, Derivative (PID) routine. The PID control values are set at the factory for
most applications. These default values PID will allow stable superheat control of the unit.

3.3 Operating Conditions

The Liebert® DSE must be operated in a conditioned space within the operating envelope that ASHRAE recommends for
data centers. Operating the DSE outside of this envelope can decrease equipment reliability. Refer to ASHRAE’s
publication, “Thermal Guidelines for Data Processing Environments.”

The recommended maximum for return air temperature is 105°F (40°C) and maximum dew point is 59°F (15°C). The
recommended minimum return air temperature setpoint for the DSE is 85°F(29.4°C).

3.3.1 Humidification Control

The humidifier option is not available on the DA250 or DA265. A remote humidifier contact is available for a standalone
humidifier.

3.4 Shipping Dimensions and Unit Weights

Table 3.2 Downflow Unit Domestic and Export Shipping Dimensions and Weights

Model #

DA250, DA265

Fan section

Ship Weight, lb(kg) Shippin g Dim ensions, in.(mm ) Ship Weight, lb(kg) Shipping Dimensio ns, in.(mm)

6,160

(2,794)

3,281

(1,488)

Dom estic Packaging Export Packaging

90 x 128 x 97

(2,286 x 3, 251 x 2,464)

90 x 128 x 54

(2,286 x 3, 251 x 1,37 2)

6,540 (2,966)

3,676 (1,667)

90.5 x 1,28.5 x 99

(2,299 x 3,264 x 2,515)

90.5 x 1,28.5 x 99

(2,299 x 3,264 x 2,515)

Dry Weight, lb(kg)

4,761

(2,159)

2325

(1,055)

12

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

Table 3.3 Liebert® MCV Condenser Unit Domestic and Export Shipping Dimensions and Weights

Dom estic Packaging Export Packaging

Model #

Ship Weight, lb

(kg)

Shippin g

dimension s, ft

(mm)

Ship Weight, lb

(kg)

Shippin g

dimension s, ft

(mm)

Dry Weight, lb

(kg)

Max. Operation

Weight, lb(kg)

1

MCV440
(singleskid)
8-fan+PR250

2

MCV440
(dual skid)
16-fan+PR250
(qty.2)

1

Deduct 120 lbs. (55kg) if no receivers

2

Deduct 220 lbs. (100kg) if no receivers.

5,900

(2,676)

11,580

(5,252)

8ft 6 in. x 14 ft 6

in. x 9ft6in.

(2,591 x 4,420 x

2,896)

8ft 6 in. x 29ft x

9ft6in.

(2,591 x 8,839 x

2,896)

6,200

(2,812)

11,580

(5,252)

9ft 5 in. x 14ft
9in. x 9ft6in.

(2,870 x 4,496 x

28,96)

9ft 5 in. x 29ft
4in. x 9ft6in.

(2,870 x 8,941 x

2,896)

5,800

(2,667)

11,560

(5,243)

5,940

(2,694)

11,880

(5,388)

3 Pr e-installation PreparationandG uidelin es

13

This page intentionally left blank

14

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

4 EQUIPMENT INSPECTION AND HANDLING

WARNING! Risk of top heavy unit falling over. Improper handling can cause equipment damage, injury or
death. Read all of the following instructions and verify that all lifting and moving equipment is rated for the
weight of the unit before attempting to move, lift, remove packaging from or prepare the unit for installation.

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.

NOTICE

Risk of passageway interference. Can cause unit and/or structure damage. The unit may be too large to fit
through a passageway while on or off 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. Keep the unit upright, indoors and protected from dampness, freezing temperatures
and contact damage.

Upon arrival of the unit and before unpacking:

• Verify that the labeled equipment matches the bill of lading.

• Carefully inspect all items for visible or concealed damage.

• Report damage immediately to the carrier and file a damage claim with a copy sent to Vertiv or to your sales
representative.

Equipment Recommended for Handling the Unit:

• Forklift

• Slings

• Spreader bars

• Beam trolleys

• Chain hoists

• Gantries

4.1 Packaging Material

All material used to package this unit is recyclable. Please save for future use or dispose of the material appropriately.

4 Equipment Inspection and Hand lin g

15

4.2 Handling the Unit while Packaged

If possible, transport the unit with a forklift

When using a forklift:

• Make sure that the lift has adjustable forks, and are spread to the widest allowable distance to still fit under the
skid.

• Make sure that the fork length is suitable for the skid length. Skid length is 128in. (3251mm).

• If the unit must be lifted higher than 2in.(51mm) to 4in. (102 mm), all personnel not directly involved in
moving the unit must be 20ft. (5m) or farther from the unit.

4.3 Unpacking the Unit

Remove exterior package material from around, and on top of the unit.

Figure 4.1 Unpacking the Unit

16

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

4.4 Removing the Unit from the Skid

NOTE: If you do not follow these steps, damage could occur to the panels and base of the unit.

1. Referring to Figure 4.2 below, use a 9/16 in. socket driver to remove the lag screws (24 total) from the four
corner brackets to detach the unit from the skid.

Figure 4.2 Remove Corner Brackets

4 Equipment Inspection and Hand lin g

17

2. Open the door indicated in Figure 4.3 below, and locate the rigging fastener kit that is secured to the bottom
base inside the door.

3. Using the instructions included in the kit, install the rigging hardware for lifting the unit from the skid. Figure 4.3

below, shows an example of one of the eye nuts installed.

Figure 4.3 Locate the Rigging Fastener Hardware Kit

18

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

4. Attach the recommended rigging equipment to the eye nuts installed in Step 3.

5. Using the rigging equipment, lift the unit from the skid, and remove the skid from under the unit, see Figure 4.4

below.

Figure 4.4 Lifting Unit and Removing Skid

4 Equipment Inspection and Hand lin g

19

6. Use the rigging equipment to move the unit to the final installation location, see Figure 4.5 below.

Figure 4.5 Moving the Unit with Rigging

4.5 Unpacking and Handling the Fan Section

Refer to drawing number 336511 "Instructions Handling/Installation of Fan Section CW/DSE" that is included in the fan
plenum packaging for instructions on uncrating and handling the fan section.

20

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

5 ELECTRICAL FIELD CONNECTIONS

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 equipment damage, 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
any electric connection enclosures. Service and maintenance work must be performed only by properly
trained and qualified personnel and in accordance with applicable regulations and manufacturers’
specifications. Opening or removing the covers to any equipment may expose personnel to lethal voltages
within the unit even when it is apparently not operating and the input wiring is disconnected from the
electrical source.

NOTICE

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.

WARNING! Risk of wiring damage, short circuits and electric shock. Can cause overheated wiring, smoke, fire,
activation of fire suppression systems and EMS personnel and equipment, building and equipment damage,
injury or death. Insert CSA certified or UL listed bushings into holes and or knockouts used to route wiring
through metal panels to protect the wire insulation from contact with sheet metal edges.

Risk of improper electrical connection of three phase input power. Can cause backward compressor rotation
and unit damage. Service technicians should use a gauge set on the system during the initial startup to verify
that the three phase power is connected properly. Three phase power must be connected to the unit line
voltage terminals in the proper sequence so that the compressors rotate in the proper direction. Incoming
power must be properly phased to prevent compressors from running backward. We recommend checking the
unit’s phasing with proper instrumentation to ensure that power connections were made correctly. We also
recommend verifying discharge and suction pressures during startup to ensure that the compressors are
running in the correct direction.

5 Electrical Field Connections

21

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: backup generator
systems) for startup, 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.

See transformer label for primary tap connections. Installer will need to change transformer primary taps if
applied unit voltage is other than pre-wired tap voltage.

NOTE: Seal openings around piping and electrical connection to prevent air leakage. Failure to do so could reduce the
unit’s cooling performance.

Three phase electrical service is required for all models. Electrical service must conform to national and local electrical
codes. Refer to equipment nameplate regarding wire size and circuit protection requirements. Refer the appropriate
submittal drawing, listed in Table 5.1 below, for electrical service entrances into unit

• Liebert® DSE voltage should be verified with available power supply before installation. Refer to the unit’s
electrical schematic and serial tag for specific electrical requirements. Line voltage electrical service is also
required for all condensers at the location of the condenser.

• For the most reliable operation of the system, the indoor unit and the Liebert® MCV condenser should be on the
same power source. The Liebert® DSE system offers an option for a power feed from the active source on the
indoor unit to the outdoor condenser. This configuration provides the greatest reliability and fastest recovery
during power loss or source change.

• When powering the outdoor condenser from the indoor unit, there is a breaker/fuse on the indoor unit.

• A unit disconnect is standard on the Liebert® MCV skid. However, a site disconnect may be required per local
code to isolate the unit for maintenance. Refer to the unit’s serial tag for specific condenser electrical
requirements.

• Route the supply power to the site disconnect switch and then to a factory provided high voltage enclosure
located on the MCV heat rejection skid.

• A manual electrical disconnect switch should be installed in accordance with local codes and distribution
system. Consult local codes for external disconnect requirements.

The electrical and unit to unit connections are described in the submittal documents included in the Submittal Drawings.

The following table lists the relevant documents by number and title.

Table 5.1 Electrical Field Connection Drawings

Docu ment Num ber Title

DPN004797 Liebert®DSE Electrical Field Connections DA250, DA265 Downflow Models

DPN003886

Unit to Unit Networking

DPN004351

22

Liebert®Heat Rejection Skid CANbus and Interlock Connections Liebert®MCV and Liebert®MCV
EconoPhase and Base Assembly

Liebert®iCOM™ Unit to Unit Network Connections (Liebert® CW, Liebert® CWA, Liebert® DS, Liebert® DSE,
Liebert®P DX, Liebert® PCW

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

6 PIPING AND REFRIGERANT REQUIREMENTS

All fluid and refrigeration connections to the unit are sweat copper. Factory installed piping brackets must not be removed.
Field installed piping must be installed in accordance with local codes and must be properly assembled, supported,
isolated and insulated. Avoid piping runs through noise sensitive areas, such as office walls and conference rooms.

Refer to specific text and detailed diagrams in this manual for other unit specific piping requirements.

All piping below the elevated floor must be located so that it offers the least resistance to air flow. Careful planning of the
piping layout under the raised floor is required to prevent the air flow from being blocked. When installing piping on the
subfloor, we recommend that the pipes be mounted in a horizontal plane rather than stacked one above the other. Whenever
possible, the pipes should be run parallel to the air flow.

The following pipe connections are required:

• A drain line from the unit.

• A drain line from the secondary drain pan (if applicable).

• Refrigerant piping connections between the evaporator unit and the MCV440 heat rejection skid. See

Refrigerant Piping and Charging on page26.

The pipe connection locations, piping general arrangement and schematics are described in the submittal documents
included in the Submittal Drawings.

The following tables list the relevant documents by number and title.

Table 6.1 Piping General Arrangment Drawings

Docu ment Num ber Title

DPN004476 Piping Schematic, DA125, DA150, DA165 & DA250 with Liebert®MCV

DPN005206 Piping Schem atic, DA265 with Liebert®MCV

Piping Arrangement - Liebert®MCVCondenser and EconoPhase Pump Locations

DPN003965 Liebert® DSEAir Cooled Piping Schematic Liebert®MCV Mounted above Liebert®DA125-250

DPN005207 Liebert® DSE Air Cooled P iping Schematic Liebert® MCV Mounted above DA265

Table 6.2 Piping Connection Drawings

Docu ment Num ber Title

DPN004208 Liebert®DSE Connection Locations, DA250, DA265

6 Pip ing and Refrigerant Requirements

23

6.1 Drain Fluid Piping

NOTICE

Risk of water leakage. Can cause severe property damage and loss of critical data center equipment.

The Liebert®DSE requires a water drain connection. Improper installation, application and service practices
can result in water leakage from the unit.

Do not locate the unit directly above any equipment that could sustain water damage.

We recommend installing monitored leak detection equipment for the water supply lines and the internal unit
water lines.

6.1.1 Field Installed, Gravity Fed Drain Line Requirements

NOTICE

Risk of water backing up in the drain line. Leaking and overflowing water can cause equipment and building
damage.

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 create an external trap.

Observe the following requirements when installing and routing the drain line:

• The drain line must be sized for 2 gpm (7.6 l/m) flow.

• The drain line must be located so it will not be exposed to freezing temperatures.

• The drain should be the full size of the drain connection.

• The drain line must slope continuously away from the unit. Pitch drain line toward drain a minimum of 1/8in.
(3mm) per 1ft (305mm) of length.

• Drain is trapped internally. Do not externally trap the drain line.

• The drain line must be rigid enough that it does not sag between supports, which unintentionally creates traps.

• The drain line must comply with all applicable codes.

• We recommend installing monitored, under floor leak detection equipment.

24

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

Figure 6.1 Correct and Incorrect Gravity Drains for Downflow Units

Table 6.3 Gravity Fed Drain Line Figure Descriptions

Item D escription

1 Correct drain installation.

2 Incorrect drain installation.

3 DSEunit.

4 Internal drain.

5 External drain.

6 Continuous downwardslope

7 External trap. Do not trap externally..

8 External trap, although unintentional. Lines must be rigid enough to not bow ov er the top of other objects.

6 Pip ing and Refrigerant Requirements

25

6.1.2 Condensate Pump Drain Line Requirements

NOTICE

Risk of water backing up in the drain line. Leaking and overflowing water can cause equipment and building
damage.

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 create an external trap.

Observe the following requirements when installing and routing the drain line:

• The drain line must be located so it will not be exposed to freezing temperatures.

• Size the piping based on the available condensate head.

• Drain is trapped internally. Do not externally trap the drain line.

• The drain line must be rigid enough that it does not sag between supports, which unintentionally creates traps.

• We recommend installing monitored, under floor leak detection equipment.

Factory Installed Condensate Pump

If your unit includes an optional condensate pump, the pump is factory installed inside the unit and a 3/4 in. copper sweat
connection is provided on the unit.

6.2 Refrigerant Piping and Charging

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.

CAUTION: Risk of excessive refrigerant line pressure. Can cause equipment damage or injury resulting from
tubing and component rupture. Do not close off the refrigerant-line isolation valve for repairs unless a
pressure relief valve is field installed in the line between the isolation valve and the check valve. The
pressure relief valve must be rated 5% to 10% higher than the system design pressure. An increase in
ambient temperature can cause the pressure of the isolated refrigerant to rise and exceed the system design
pressure rating (marked on the unit nameplate).

Consult local building and plumbing codes for installation requirements of additional pressure relief devices when isolation
valves are field installed. Do not isolate any refrigerant circuits from over pressurization protection.

Table 6.4 System Refrigerant Pressures

Maximum Design O perating Pressure (High Side) 530 psig 3655 kPa Noted on the unit serial tag

High Pressure Cut Out Safety Switch 580 psig 4000 kP a Nominal

26

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

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.

6.2.1 Refrigerant Piping Guidelines forAir CooledSystems

• Field installed interconnecting piping should be properly selected based on local codes and unit labeling.

• Air cooled units ship with a nitrogen holding charge. Do not vent the charge until all refrigerant piping is in
place, ready for connection to the unit and condenser.

• Use copper piping with a brazing alloy with a minimum temperature of 1350°F (732°C), such as Sil-Fos. Avoid
soft solders, such as 50/50 or 95/5.

• Use a flow of dry nitrogen through the piping during brazing to prevent formation of copper oxide scale inside
the piping. When copper is heated in the presence of air, copper oxide forms. POE oils will dissolve these
oxides from inside the copper pipes and deposit them throughout the system, clogging filter driers and
affecting other system components.

• A pure dry nitrogen flow of 1-3 ft3/min (0.5-1.5 l/s) inside the pipe during brazing is sufficient to displace the air.
Control the flow using a suitable measuring device.

• Ensure that the tubing surfaces to be brazed are clean and that all burrs have been removed from the ends of
the tubes.

• Ensure that all loose material has been cleaned from inside the tubing before brazing.

• Protect all refrigerant line components within 18in. (460mm) of the brazing site by wrapping them with a wet
cloth or with a suitable heat sink compound.

• Isolate piping from building using vibration isolating supports.

• The Liebert® MCV heat rejection skid cannot be installed below the evaporator.

• The DA250 is used with a Liebert® MCV heat rejection skid with receiver tanks. For this system, the outlet of
the receivers on the outdoor Liebert® MCV heat rejection skid must be higher than the elevation of the
electronic expansion valves (EEVs) inside of the indoor unit. If the vertical height of the receiver outlet is
greater than 60 ft. (18.3m) above the EEV, consult the factory. Refer to DPN003965 in Submittal Drawings on
page61.

• The DA265 is used with a Liebert® MCV heat rejection skid with without receiver tanks. For this system, the
bottom of the condenser coil on the outdoor Liebert® MCV heat rejection skid must be higher than the
elevation of the EEV inside of the indoor unit. If the vertical height between the condenser coil bottom and the
EEV is greater than 60 ft. (18.3m), consult the factory. Refer to DPN005207 in Submittal Drawings on page61

• Install traps on hot gas (discharge) lines at the base of vertical risers over 5ft.(1.5m) and then for vertical rises
over 25 ft. (7.6 m), install a trap in 20 ft (6 m) increments or evenly-divided over the vertical rise. The DA250
with piping out the top of the unit has internally installed traps on the hot gas lines.

• Pitch horizontal hot gas piping down at a minimum rate of 1/2in.per 10ft. (42mm per 10m) so that gravity will
aid in moving oil in the direction of refrigerant/oil flow.

• Consult factory if piping run exceeds 200ft. (61m) linear length or 300ft.(91m) equivalent length.

6 Pip ing and Refrigerant Requirements

27

• Keep piping clean and dry, especially on units with R-410A refrigerant.

• Avoid piping runs through noise-sensitive areas.

• Do not run piping directly in front of discharge air stream.

• Refrigerant oil – do not mix oil types (see Compressor Oil).

Refer to ASHRAE Refrigeration Handbook for general, good-practice refrigeration piping. The indoor cooling unit has a
factory installed high pressure safety switch in the high side refrigerant circuit. A fusible plug is installed in each Liebert®
DSE receiver.

NOTE: All indoor and outdoor field refrigerant piping must be insulated 1/2 in. minimum. All outdoor insulation must
be UV and ozone resistant.

• Refer to Refrigerant Line Sizes and Equivalent Lengths below, for recommended refrigerant piping sizes based
on equivalent pipe lengths.

• Refer to Refrigerant Charge Requirements for Air Cooled Systems on the facing page, for the refrigerant-charge
requirements of the system.

• Refer to Charging DA250 Air Cooled Systems (Liebert® MCV440 with Receivers) on page33, for charging
information.

6.2.2 Piping Layout and Condenser Positioning

The piping layout and condenser positioning is detailed in the submittal documents included in the Submittal Drawings.

The following table lists the relevant documents by number and title.

Table 6.5 Refrigeration Piping Layout and Condenser Positioning Drawings

Docu ment Num ber Title

DPN003965 Liebert®DSE Air Cooled Piping Schematic Liebert® MCV Mounted above Liebert® DA125-250

DPN005207 Liebert® DSEAir Cooled Piping Schematic Liebert®MCV Mounted above DA265

6.2.3 Refrigerant Line Sizes and Equivalent Lengths

Table 6.6 Recommended Refrigerant Line Sizes, OD Copper

Model

Equivalent Length Hot Gas Line, in. Liquid Line, in.

50 ft. (15 m) 1-5/8 1-3/8

100 ft. (30 m) 1-5/8 1-3/8

150 ft. (45 m ) 1-5/8* 1-3/8*

300 ft. (91 m) 1-5/8* 1-3/8*

*The DA250 and DA265 units can be extended to a maximum 200 ft (61m) linear or 300 ft (91m) equivalent length.

Source: DPN000788 Rev. 13

DA250

DA265

NOTE: See the piping schematics for your system in Submittal Drawings. For installations using pre-fabricated heat
rejection skids, included piping must be factored into total equivalent length calculation. Please consult factory for
details.

28

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

6.2.4 Refrigerant Charge Requirements for Air Cooled Systems

The following tables provide the refrigerant charge requirements for the Liebert® DSE, connected piping, and condenser
options.

Table 6.7 Indoor Unit Approximate Refrigerant Charge for R-410A Per Circuit

Indoo r Unit Type Model Circuit 1 (Outercircuit), lb(kg) Circuit 2 (In nercircuit), lb(kg)

Air cooled DA250 25 (11. 3) 25 (11. 3)

Air cooled DA265 25 (11 .3) 35 (15.9)

*System Charge: Indoor unit, MCV440 heat rejection skid with EconoPhase (PRE)and refrigerant lines.

For system charges over 200 lb. (90.7kg), consult your Vertiv representative.

See Table 9.3 on page47 for the recommended oil for the system.

The values in this table a nd in the following tables are needed in order to calculate the full system charge:

• Ta ble 6.8 below

• Ta ble 6.9 below

Table 6.8 MCV Heat Rejection Skid Refrigerant Charge for R-410A per Circuit Including PRE

Heat Rejection Skid* System # Circuit Number

Charge per Circuit, lb (kg) (With or

Without Receivers)

MCV440 Single skid with (1) PRE

unit

MCV440 Dual skid with (2) PRE units

*The heat rejection skid contains Liebert® MCV condenser(s), Liebert® DSE receiver(s)when used with a DA250 system, Liebert®EconoPhase PRE units(s),
and all internal piping. Liebert® DSE receivers are not used with a DA265 system.

1

1

2

1 62 (28.1)

2 62 (28.1)

1 62 (28.1)

2 62 (28.1)

1 62 (28.1)

2 62 (28.1)

Table 6.9 Interconnecting Piping Refrigerant Charge for R-410A, lb per 100ft (kg per 30m)

Line Size, OD, in. Liquid Line Hot Gas Line

1-3/8 51.5 (23.0) 5.9 (2.6)

1-5/8 — 8.4 (3.7)

Source: DPN003099, Rev. 1

6 Pip ing and Refrigerant Requirements

29

6.2.5 Additional Oil Requirements forScrollandDigital ScrollCompressors

NOTICE

Risk of improper compressor lubrication. Can cause compressor and refrigerant system damage.

Failure to use oil types, viscosities and quantities recommended by the compressor manufacturer may reduce
compressor life and void the compressor warranty. See Compressor Oil Types for R-410A Refrigerant, for the
recommended oil for the system.

• Do not mix polyolester (POE) and mineral-based oils.

• Do not mix oils of different viscosities.

• Consult your Vertiv sales representative, visit https://www.Vertiv.com/en-us/support/, or contact the
compressor manufacturer if questions arise.

See 6.2.5 above, for the amount required for various system charge levels.

In addition to oil added based on system charge, additional oil is required for discharge line field installed traps. Standard
formed tube traps are required, see Figure 6.2 below, and Table 6.11 on page32, because straight tubes and fittings used
as traps require much more oil and the length of the straight tube can vary.

After the system has been fully charged with refrigerant, use a hand pump to add the additional oil at the suction side of the
system while the system is running.

The amount of oil added by field service must be recorded on the tag marked “Oil Added Field Service Record,” attached
to each compressor. The date of oil addition must be included as well.

Figure 6.2 Standard Formed Tube Trap Versus Straight Tubes and Fittings Trap

Item Description

1 Standard forme d t ube tr ap

2 Stra ight t ubes and fit ti ngs t rap

30

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

Table 6.10 Additional Oil Required per Refrigerant Charge

Refrigerant System C harge

Per Circuit, lb (kg) *

< 40 (18. 1) 0

40 (18.1) 10 (300)

50 (22.7) 1 8 (530)

60 (27.2) 26 (770)

70 (31. 8) 34 (1010)

80 (36.3) 42 (1240)

90 (40.8) 50 (1480)

100 (45.4) 58 (1720)

110 (49.9) 66 (1950)

120 (54.4) 74 (2190)

130 (59.0) 82 (2430)

140 (63.5) 90 (2660)

150 (68.0) 98 (2900)

Model

DA250, DA265

Additional Oil Required Per Circuit, oz (ml)

160 (72. 6) 106 (3130)

170 (77. 1) 11 4 (3370)

180 (81.6) 1 22 (3610)

190 (86.2) 130 (3840)

200 (90.7 ) 138 (4080)

System Charge: indoor unit, MCV heat rejection skid, refrigerant lines. Calculated per circuit.

For system charges over 200 lb. (90.7kg), c onsult your Vertiv representative.

See Compressor Oil Types for R-410A Refrigerant, for the recommended oil for the system.

Source:DPN003950 Rev. 6

6 Pip ing and Refrigerant Requirements

31

Table 6.11 Volume of Oil in Standard Form Trap by Pipe Diameter

Pipe d iameter, in. Oil volume, oz (ml)

1/2 0.2 (5.9)

5/8 0.4 (11.8)

3/4 0.6 (17.7 )

7/8 0.9 (26.6)

1-1/8 1.8 (53.2)

1-3/8 3.3 (97.6)

1-5/8 5.5 (162. 7)

Source: DPN003950, Rev. 6

6.2.6 Evacuation, Leak Testing, and Charging Air Cooled Systems

Two discharge lines and two liquid linesmust be field installed between the indoor unit and the outdoor condenser.

NOTE: Keep the evaporator unit, receiver (if equipped), and condenser closed with their factory charge of dry
nitrogen while all field piping is installed. Keep the field piping clean and dry during installation. Do not allow it to
stand open to the atmosphere. When all the field interconnecting piping is in place, vent each outdoor unit’s dry
nitrogen charge and connect to the field piping. Finally, vent the evaporator unit's dry nitrogen charge and make its
piping connection last. Follow all proper brazing practices, including a dry nitrogen purge to maintain system
cleanliness. The condenser connection pipes must be wrapped with a wet cloth to keep the pressure and temperature
sensors cool during any brazing.

Evacuation and Leak Testing Air Cooled Systems

For proper leak check and evacuation, you must open all system valves and account for all check valves.

NOTE: The system includes a factory installed check valve and an additional downstream Schrader valve with core in
the compressor discharge line. Proper evacuation of the condenser side of the compressor can be accomplished only
using the downstream Schrader valve. See the appropriate piping schematic for your system in Submittal Drawings.

1. Starting with Circuit #1, open the service valves and place a 150 PSIG (1034kPa) of dry nitrogen with a tracer
of refrigerant. Check the system for leaks with a suitable leak detector.

2. With pressure still in Circuit #1, open the compressor service valves in Circuit#2.

• If pressure increases in Circuit#2, the system is cross-circuited and must be re-checked for proper
piping.

• If there is no pressure increase, repeat step1 on Circuit#2.

3. After completion of leak testing, release the test pressure, (observe local code) and pull an initial deep vacuum
of 500microns on the system with a suitable pump.

4. After fourhours, check the pressure readings and, if they have not changed, break vacuum with dry nitrogen.
Pull a second and third vacuum to 500 microns or less. Re-check the pressure after twohours.
When the three checks are complete, remove the jumper hose from the service valve fitting and the condenser,
and proceed to Charging DA250 Air Cooled Systems (Liebert® MCV440 with Receivers) on the facing page.

32

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

Charging DA250 Air Cooled Systems (Liebert® MCV440 with Receivers)

NOTICE

Risk of improper refrigerant charging. Can cause equipment damage.

R-410A is a blended refrigerant and must be introduced and charged from the cylinder only as a liquid.

When adding liquid refrigerant to an operating system, it may be necessary to add the refrigerant through the
compressor suction service valve. Care must be exercised to avoid damage to the compressor. We recommend
connecting a sight glass between the charging hose and the compressor suction service valve. This will permit
adjustment of the cylinder hand valve so that liquid can leave the cylinder while allowing vapor to enter the
compressor.

NOTICE

Risk of improper operation. Can cause compressor failure.

Operating the unit with the EEV closed can cause compressor failure. The reheat and humidifier are disabled. A
minimum of 20 psig (138 kPa) must be established and maintained for the compressor to operate. The
charging function can be reset as many times as required to complete

To charge the system:

1. Check the nameplate on the indoor unit for refrigerant type to be used. Unit control configurations differ
depending on refrigerant type.

2. The unit must be operating during charging, refer to Checklist for Completed Installation on page37

3. Calculate the amount of charge for the system. See Refrigerant Charge Requirements for Air Cooled Systems
on page29.

4. Accurately weigh in as much of the system charge as possible before starting the unit. Do not exceed the
calculated charge by more than 0.5lb(0.37kg).

5. Close the MVC heat rejection skid disconnect switch.

• We recommend charging the unit with the return air setpoint between 75°F and 85°F (24°C and 29°C).

• The return air temperature to the unit being charged must be stable and must be maintained greater
than 65°F(18°C). If this is not possible due to lack of heat load, then the load banks must be used to offset
the cooling load during startup. See Target Refrigerant Level in Sight Glasses at Outdoor Temperatures
on the next page.

6. Close the Liebert® DSE disconnect switch.

6 Pip ing and Refrigerant Requirements

33

7. In the Service menu of the Liebert® iCOM™ controller, select Diagnostics/Service > Diagnostics:

a. Enable Manual Mode.

NOTE: Manual Mode will time out after 30 minutes.

b. In the search box, enter E177 and press Enter.

Two parameters appear in the Parameter Directory (E177.1 and E177.2).

Press the Gear icon in the upper right corner.

Select Make Writeable.

Change E177.1 and E177.2 from 15 minutes to 2 minutes.

This reduces the superheat setpoint from 24°F (13.3 °C) to 13°F (7.2°C) in two minutes.

c. In Evaporator Fan options set Motors to On to operate the fan during Manual Mode.

d. In Compressor Circuit 1 options, set Compressor Mode to Charge to operate Compressors 1A and 1B at

full capacity. Turn Compressor 1A and 1B to On. The EEV will modulate to control superheat setpoint

e. Reset the charge function as many times as needed to complete unit charging.

NOTE: You must establish and maintain a minimum 20psig (138kPa) for the compressor to operate.

f. Repeat step 7 for Compressor Circuit 2.

8. Check the refrigerant level in the refrigerant level sight glasses on each receiver after the unit has been
operating for at least 15minutes.

NOTE: Each receiver at the condenser has two sight glasses and the refrigerant level varies with outside temperature.

9. Adjust the refrigerant level in each circuit to meet the level shown in Target Refrigerant Level in Sight Glasses

at Outdoor Temperatures below.

10. After adjusting the refrigerant, allow the system to operate an additional 15minutes before checking for the
need of further adjustment.

11. Repeat the procedure for the second circuit.

NOTE: A digital scroll compressor can have a clear unit sight glass on the liquid line only when operating at 100%
capacity. When operating with a receiver, the unit sight glass might not become clear even when operating at 100%
capacity. When operating below 100%, the unit sight glass may show bubbles with each 15 second unloading cycle.

Target Refrigerant Level in Sight Glasses at Outdoor Temperatures

• 40°F (4.5°C) and lower—bottom sight glass is 3/4 full

• 40°F (4.5°C) and higher—bottom sight glass is full

If the return air temperature cannot be maintained between 75°F and 85°F (24°C and 29°C) due to lack of load, then the
liquid level receiver must be adjusted to the following if return air is between 65°F and 75°F (18°C and 24°C):

• 40°F (4.5°C) and lower—Charge to the bottom of the top sight glass.

• 40°F (4.5°C) and higher—Top sight glass is 1/4 full.

34

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

Charging DA265 Air Cooled Systems (Liebert® DA265 without Receivers)

NOTICE

Risk of improper refrigerant charging. Can cause equipment damage.

R-410A is a blended refrigerant and must be introduced and charged from the cylinder only as a liquid.

When adding liquid refrigerant to an operating system, it may be necessary to add the refrigerant through the
compressor suction service valve. Care must be exercised to avoid damage to the compressor. We recommend
connecting a sight glass between the charging hose and the compressor suction service valve. This will permit
adjustment of the cylinder hand valve so that liquid can leave the cylinder while allowing vapor to enter the
compressor.

NOTICE

Risk of improper operation. Can cause compressor failure.

Operating the unit with the EEV closed can cause compressor failure. The reheat and humidifier are disabled. A
minimum of 20 psig (138 kPa) must be established and maintained for the compressor to operate. The
charging function can be reset as many times as required to complete.

To charge the system:

1. Check the nameplate on the indoor unit for the refrigerant type to be used. Unit control configurations differ
depending upon the refrigerant type.

2. The unit must be operating during charging. Refer to Checklist for Completed Installation on page37

3. Calculate the amount of charge for the system. See Refrigerant Charge Requirements for Air Cooled Systems
on page29.

4. Accurately weigh in as much of the system charge as possible before starting the unit. Do not exceed the
calculated charge by more than 0.5 lb (0.37 kg).

5. Close the Liebert® MCV heat rejection skid disconnect switch.

• Unit must be charged with the return air within +/- 10°F (5.5° C) of the operating point.

• If the operating point changes, the charge may need to be adjusted according to the new operating
point.

• The return air temperature to the unit being charged must be stable. If this is not possible due to the lack
of heat load, then the load banks must be used to offset the cooling load during startup.

6. Close the Liebert® DSE disconnect switch.

7. In the Service menu of the Liebert® iCOM™ controller, select Diagnostics/Service > Diagnostics.

a. Enable Manual Mode.

NOTE: Manual mode will time out after 30 minutes.

b. In the Search Box type E177 and press Enter.

6 Pip ing and Refrigerant Requirements

Two parameters appear in the Parameter Directory (E177.1 and E177.2).

Press the Gear icon in the upper right corner.

Select Make Writeable.

Change E177.1 and E177.2 from 15 minutes to 2 minutes.

This will reduce the superheat setpoint from 24°F (13.3° C) to 13°F (7.2° C) degrees in two minutes.

35

c. In the Evaporator Fan options, set Motors to On to operate the fan during Manual Mode.

d. In Compressor Circuit 1 options, set the Compressor Mode to Charge to operate Compressors 1A and 1B

at full capacity. Turn Compressor 1A and 1B to On. The EEV will modulate to control superheat setpoint.

e. Reset the charge function as many times as needed to complete unit charging.

NOTE: You must establish and maintain a minimum 20 psig (138 kPa) for the compressor to operate.

8. Check out the subcooling using the Schrader port on the liquid line just before the expansion valve. Superheat
should be around 13°F (7.2°C) before verifying subcooling.

9. Adjust the refrigerant level to meet the subcooling shown in Table 6.12 below

10. After adjusting the refrigerant, allow the system to operate an additional 15 minutes before checking the need
of further adjustment.

NOTE: A digital scroll compressor can have a clear unit sight glass on the liquid line only when operating at 100%
capacity. When operating below 100% capacity, the unit sight glass may show bubbles with each 15 second unloading
cycle.

Table 6.12 Target Subcooling at Outdoor Temperature

Outdo or Ambient Subco oling

°F °C °F °C

-30 -34.4 10 5.5

-15 -26.1 10 5.5

0 -17. 8 10 5.5

15 -9.4 1 0 5.5

30 -1.1 1 0 5.5

45 7.2 1 0 5.5

60 15.6 10 5.5

75 2 3.9 10 5.5

85 29.4 1 0 5.5

95 35 10 5.5

105 40.6 12 6.7

115 46.1 14 7.8

Subcoolingshould be within ± 3°F (1. 7°C)

11. Repeat steps 7 through 10 for Compressor Circuit 2.

12. Change E177.1 and E177.2 back to 15 minutes after both circuits are charged.

36

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

7 CHECKLIST FOR COMPLETED INSTALLATION

7.1 Moving and Placing Equipment

1. Unpack and check received material.

2. Make sure that proper clearance for service access has been maintained around the equipment.

3. Check that equipment is level and mounting fasteners are tight.

7.2 Electrical Installation Checks

1. Check that supply voltage and phase matches equipment nameplate.

2. Check that power wiring connections completed to the disconnect switch, evaporator unit and heat rejection
equipment.

3. Check that power line circuit breakers or fuses have proper ratings for equipment installed.

4. Control wiring connections completed between indoor evaporator and heat rejection equipment.

5. Ensure that all internal and external high and low voltage wiring connections are tight.

6. Confirm that unit is properly grounded to an earth ground.

7. Check that control transformer setting matches incoming power.

8. Confirm that electrical service conforms to national and local codes.

9. Check blowers and compressors for proper rotation.

7.3 Piping Installation Checks

1. Check that piping is completed to refrigerant loop.

2. Confirm that piping has been leak checked.

3. Check that additional oil has been added for system charges over 40 pounds (18.1kg) per circuit. See

Additional Oil Requirements forScrollandDigital ScrollCompressors on page30.

4. Check that piping is properly sized, sloped and trapped as shown in the piping schematics.

5. Check piping inside and outside of equipment for proper support and adequate spacing to prevent rub
through.

6. Ensure that factory clamps have been reinstalled.

7. Confirm that the drain line is connected, not obstructed, and pitched per local code.

7.4 Other Installation Checks

1. Make sure that ducting or plenum assembly complete (if required), maintain access to filters.

2. Check that filters are installed.

3. Check fasteners that secure motors—some may have become loose during shipment.

4. Verify water detection is properly installed around all units (recommended).

5. Confirm that blower drive system rotates freely.

6. Check all fans are free of debris.

7. Set fan airflow calibration voltage. Refer to Table 7.1 on the next page, for values. The values are set in the
iCOM™ Service menu > Setpoints > Fan.

7 Checklist for Completed Installation

37

Table 7.1 Airflow Calibration Voltage DA250

Air Flow* at 0.1in.(25Pa) ESP Air Flow C alibration Vo ltage

CFM CMH 60 Hz 50 Hz

25,0 00 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

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.

38

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

Table 7.2 Air Flow Calibration Voltage DA265

Air Flow* at 0.1in.(25Pa) ESP Air Flow C alibration Vo ltage

CFM CMH 60 Hz 50 Hz

25000 42,475 5.42 6.49

26,000 44,174 5.61 6.71

27, 000 45,873 5.80 6.94

28,000 47,572 5.99 7.1 7

29,000 49,271 6.18 7.40

30,000 50,970 6.37 7.62

31,000 52669 6.56 7 .85

32,000 54368 6.75 8.08

33,000 56,067 6.94 8.31

34,000 57,766 7. 13 8.54

35,000 59,465 7.32 8.76

36,000 61, 164 7.52 8.99

37,000 62,863 7.7 1 9.22

38,000 64,562 7. 90 9.45

39,000 66,261 8.09 9.67

40,000 67,960 8.28 9.90

41,000 69,659 8.47 -

42,000 7 1358 8.66 -

43,000 73,057 8.85 -

44,000 74,756 9.04 -

45000 76,455 9.23 -

46000 78,154 9.42 -

47000 79,853 9.61 -

48000 81,552 9.80 -

49000 83,251 9.99 -

*Maximum air flow calibration voltage must be adjusted based on the required air flow.

7 Checklist for Completed Installation

39

This page intentionally left blank

40

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

8 INITIAL STARTUP CHECKS ANDCOMMISSIONINGPROCEDURE
FORWARRANTYINSPECTION

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 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.

NOTICE

Risk of improper electrical connection of three phase input power. Can cause backward compressor rotation
and unit damage. Service technicians should use a gauge set on the system during the initial startup to verify
that the three phase power is connected properly. Three phase power must be connected to the unit line
voltage terminals in the proper sequence so that the compressors rotate in the proper direction. Incoming
power must be properly phased to prevent compressors from running backward. We recommend checking the
unit’s phasing with proper instrumentation to ensure that power connections were made correctly. We also
recommend verifying discharge and suction pressures during startup to ensure that the compressors are
running in the correct direction.

• Confirm that all items on Checklist for Completed Installation on page37 have been done.

• Locate the Liebert® DSE Warranty Inspection Check Sheet in the unit’s electric panel.

• Complete the Liebert® DSE Warranty Inspection Check Sheet during startup.

• Forward the completed Liebert® DSE Warranty Inspection Check Sheet to your local sales office. This
information must be completed and forwarded to validate warranty.

• Contact your local sales representative or technical support if you have any questions or problems during unit
startup and commissioning. Visit https://www.Vertiv.com/en-us/support/ or call 1-800-543-2778 for contacts.

8 In itial Startup Checks andCommis sioningProcedure forWarrantyInspection

41

This page intentionally left blank

42

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

9 MAINTENANCE

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 equipment damage, 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
any electric connection enclosures. Service and maintenance work must be performed only by properly
trained and qualified personnel and in accordance with applicable regulations and manufacturers’
specifications. Opening or removing the covers to any equipment may expose personnel to lethal voltages
within the unit even when it is apparently not operating and the input wiring is disconnected from the
electrical source.

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 electric shock. Can cause serious injury or death. The Liebert® iCOM™ microprocessor
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 Liebert® iCOM™ control. Open all local and remote electric
power disconnect switches and verify with a voltmeter that power is Off before working on any component of
the system.

9 Main tenan ce

43

The Liebert® DSE is a single component in the facility heat removal system. The system includes air distribution (raised
floors, duct systems), outdoor heat rejection (condensers, pumps) and indoor cooling and humidity loads (equipment load,
location, outside air infiltration). Proper application and maintenance of the entire system is critical to the life and reliability
of the thermal-management units.

• Good maintenance practices are essential to minimizing operation costs and maximizing product life.

• Read and follow monthly and semi-annual maintenance schedules included in this manual. These minimum
maintenance intervals may need to be more frequent based on site-specific conditions.

• See the Liebert®iCOM™ user manual, SL-31075, available at www.Vertiv.com, for instructions on using the
controller to predict some service maintenance intervals.

• We recommend the use of trained and authorized service personnel, extended service contracts and factory
specified replacement parts. Contact your Vertiv sales representative.

9.1 Filters

NOTICE

Risk of improper filter installation. Can cause filter collapse and airflow reduction.

To maximize the performance and reliability of the equipment, use only Vertiv filters. Contact your Vertiv representative to
order replacement filters.

Verify that filters are installed and positioned so the airflow direction marked on the filter is the same direction as unit air
flow.

Table 9.1 Filter Quantity and Type

Unit Size Filter Type

DA250, DA265 MERV 8 or MERV 11

Width x Length x Depth (in/mm)

Filter Size,

28 X 22 X 4

711 X 559 X 102

Quantity

15

9.1.1 Replacing the Filters

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. Do not operate the
unit with any or all cabinet panels removed.

Enter the unit through the service access door, and locate the supply side air filters in front of the heat exchanger. Refer to
DPN005217 in Submittal Drawings.

Table 9.2 Filter Replacement Drawings

Docu ment Num ber Title

DPN005217 Liebert® DSE Filter Replacement DA250, DA265

44

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

9.2 Fan Maintenance

9.2.1 Fan Assembly Troubleshooting

Any safety hazards stemming from the device must be re-evaluated once it is installed in the end device.

Do not make any modifications, additions or conversions to the fan assembly without the approval of Vertiv.

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 opening the fan motor
electric connection enclosure. Use only fully trained and qualified HVAC technicians to replace or perform
maintenance on the EC fans.

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. Do not operate the
unit with any or all cabinet panels removed.

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.

CAUTION: Risk of contact with hot surfaces. Can cause injury. The 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, OSHA­approved PPE when working on or near hot components.

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: backup generator
systems) for startup, 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.

NOTE: Do not assume that the fan blades will not start to spin. If the motor is in a fault condition, it will safely shut
down. Once the fault condition is cleared, there are certain conditions in which the motor will automatically resume
operation.

9 Main tenan ce

45

9.2.2 Fan Impellers

Fan impellers should be periodically inspected and any debris removed. Check to ensure that the impellers can rotate
freely.

Consult the factory for fan assembly maintenance and removal instructions. Do not attempt to service or remove the fans
without first contacting Vertiv support at 1-800-543-2778.

9.2.3 Blower Motor Lubrication

The motor is initially lubricated at the factory.

• Contact the motor manufacturer for the lubrication interval for motor bearings.

• Contact the motor manufacturer to determine the type of grease to use for lubrication.

9.2.4 Removing Fan Assembly

Do not attempt to remove the fan assemblies without first contacting Vertiv Technical Support at 1-800-543-2778.

9.3 Condensate Drain and Condensate Pump System Maintenance

9.3.1 Condensate Drain

Check for and clear obstructions in tubing during routine maintenance.

9.3.2 Condensate Pump

WARNING! Risk of electric shock. Can cause injury or death. Open all local and remote electric power supply
disconnect switches and verify that power is Off with a voltmeter before working within the condensate
pump electrical connection enclosure. The Liebert® iCOM™ 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
Liebert®iCOM™.

To maintain the condensate pump:

1. Disconnect power to the unit using the disconnect switch.

2. Check for and clear obstructions in gravity lines leading to the condensate pump.

3. Remove the sump, clean with a stiff nylon brush and flush with water.

4. Inspect and clear clogs in the discharge check valve and float mechanism.

5. Reassemble and check for leaks.

46

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

9.4 Electronic Expansion Valve (EEV) Maintenance

The EEV controls superheat through the Liebert® iCOM™ controls by actively measuring suction pressure via a transducer
attached to the suction line rotalock and suction temperature via a thermister strapped to the suction line. The EEV actively
adjusts the orifice size and resulting mass flow of refrigerant to maintain the superheat setpoint (set in Liebert® iCOM™).
The EEV is used in place of the standard thermal expansion valve (TXV).

WARNING! Risk of electric shock. Can cause serious injury or death. The Liebert® iCOM™ microprocessor
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 Liebert® iCOM™ control. Open all local and remote electric
power disconnect switches and verify with a voltmeter that power is Off before working on any component of
the system.

NOTE: Intermittent loss of subcooling may result in EEV/superheat instability. If superheat instability is observed,
check for proper refrigerant level in receiver (see Refrigerant Piping Guidelines forAir CooledSystems on page27 for
the proper charge level). If proper charge is observed in receiver, and superheat remains unstable, then increase
superheat setting in the Liebert® iCOM™ to 15°F (8.49°C).

9.5 Compressor Maintenance

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.

9.5.1 Compressor Oil

NOTICE

Risk of improper compressor lubrication. Can cause compressor and refrigerant system damage.

Failure to use oil types, viscosities and quantities recommended by the compressor manufacturer may reduce
compressor life and void the compressor warranty.

• Do not mix polyolester (POE) and mineral based oils.

• Do not mix oils of different viscosities.

• Consult Vertiv technical support or the compressor manufacturer if questions arise.

Table 9.3 Compressor Oil Types for R-410A Refrigerant

Compressor Type Oil Type

Copeland Scroll and Digital Scroll POE Oil - ISO 32 Centistoke Viscosity

1. Use Copeland POE Oil ULTRA32-3MAF or other Copeland-approved oils.

Source: DPN003950. Rev. 5

1

9 Main tenan ce

47

9.5.2 Replacement Compressors

Replacement compressors are available through your Vertiv sales office. If the unit is under warranty, the replacement
compressor must be obtained from and the original compressor returned to your local Vertiv sales office. Compressors are
shipped in reusable packaging, and the original compressor should be returned in the same packaging.

9.5.3 Rotalock Valve on Digital Scroll Compressors

CAUTION: Risk of explosive discharge of high pressure refrigerant. Can cause serious injury. Neutral and
service ports on the rotalock valve do not have a valve core. Front seat the service valves and relieve pressure
from the compressor before loosening a part or a component attached to the service valve. Follow local codes
to properly reclaim refrigerant.

• The Neutral port remains open to the compressor side in all positions of the valve stem, see Figure 9.1 below.
A high pressure cut out switch or low pressure switch/transducer will be connected to this port.

• The Service port is closed to the system when valve stem is back-seated, see Figure 9.1 below. It is open to
the system as soon as the valve is adjusted away from the back seated position.

Figure 9.1 Rotalock Valve

Item Description

1 Service port (gauge)

2 Front seat

3 B ack seat

4 Compressor side of valve

5 N eutral port

6 System side of va lve

9.5.4 Unloading Solenoid(s) on a Digital Scroll Compressor

When replacing a digital scroll compressor, the digital solenoid valve and coil must be replaced. The compressor and valve
kit are shipped separately. The valve kit must be field brazed to the top of the compressor in proper orientation and
supported with the original factory bracket.

48

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

9.5.5 Compressor Electrical Failure (Motor Burnout)

If a burnout has occurred, a full system clean out is required. If not cleaned, compressor and system problems will continue.

Consult the factory for compressor maintenance. Do not attempt to remove the compressor without first contacting Vertiv
support at 1-800-543-2778.

9.5.6 Replacing a Compressor with Electrical Failure (MotorBurnout)

WARNING! Risk of electric shock. Can cause serious injury or death. The Liebert® iCOM™ microprocessor
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 Liebert® iCOM™ control. Open all local and remote electric
power disconnect switches and verify with a voltmeter that power is Off before working on any component of
the system.

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.

NOTE: Release of refrigerant to the atmosphere is harmful to the environment. Refrigerant must be recycled or
discarded in accordance with federal, state, and local regulations.

1. Attach suction and discharge gauges to access fittings.

2. Recover refrigerant using an approved recovery procedure and equipment. Use a filter drier when charging the
system with recovered refrigerant.

3. Remove the marked pressure transducer and the discharge pressure switch. Disconnect all electrical
connections.

4. Detach service valves from the compressor.

5. Remove the failed compressor.

6. Follow compressor manufacturer’s suggested clean-out procedures.

7. Install the replacement compressor and make all connections. Replace the gaskets or seals on the service
valves. Replace the unloading solenoid.

8. Evacuate, charge and operate per the appropriate procedure per local codes:

• Evacuation, Leak Testing, and Charging Air Cooled Systems on page32

NOTICE

Risk of improper component re-installation. Can cause equipment damage.

Identify and mark location of suction pressure transducer and discharge pressure switch. These devices look
similar and they must be reinstalled in their original location.

9.5.7 Compressor Mechanical Failure

If mechanical failure of the compressor has occurred, only the compressor needs replaced. A full system clean out is not
required..

9 Main tenan ce

49

9.5.8 Replacing a Compressor with Mechanical Failure

WARNING! Risk of electric shock. Can cause serious injury or death. The Liebert® iCOM™ microprocessor
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 Liebert® iCOM™ control. Open all local and remote electric
power disconnect switches and verify with a voltmeter that power is Off before working on any component of
the system.

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.

NOTE: Release of refrigerant to the atmosphere is harmful to the environment. Refrigerant must be recycled or
discarded in accordance with federal, state, and local regulations.

1. Front seat service valves to isolate the compressor. Recover refrigerant using an approved recovery procedure
and equipment

2. Remove the failed compressor.

3. Keep the replacement compressor sealed until installation is complete to the point that the system isolation
valves are ready to be engaged. Keep exposure of the POE oil in the compressor to the atmosphere to a
minimum.

4. Install the replacement compressor, replace the gaskets or seals on the service valves, and make all
connections. Replace the unloading solenoid if equipped.

5. Once the compressor is completely installed, keep the isolation valves closed to the system and open to the
compressor. Add dry nitrogen to the compressor and check all connections for leaks. With no leaks confirmed,
evacuate the isolated compressor prior to introducing to the rest of the system.

6. When evacuating the isolated compressor volume, pull a vacuum of 500microns with no decay above
1000microns within 20minutes.
Once evacuation requirements of the compressor are met, open the valves to open the compressor to the
system.

7. Check the compressor and system operation. Make any necessary adjustments for proper equipment
operation.

9.6 Evaporator Coil

The DA250 and DA265 units contain single slab coils. This results in different evaporator (suction) temperatures between
System 1 and System 2. The outer coil (System 1) will operate at a higher evaporator temperature than the inner coil
(System 2) when operating at the same compressor loading.

50

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

9.7 Air Cooled Condenser Maintenance

Restricted airflow will reduce operating efficiency and could result in high compressor head pressure and loss of cooling.

• Clear the coil surface of all debris that will inhibit airflow.

• Check for bent or damaged coil fins and correct.

• Do not permit snow to accumulate around or under the outdoor unit.

• Periodically consider commercial cleaning of the coil surface

• Inspect fans, motors and controls for proper operation.

• Check all piping and capillaries for proper support.

• Inspect for leaks.

• Check contactors for pitting. Replace if pitted.

9 Main tenan ce

51

This page intentionally left blank

52

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

10 PREVENTIVE MAINTENANCE CHECKLIST

Source: DPN002952, Rev. 4

Inspection Date Job Name

Indoor Unit Model # Indoor Unit Serial Number #

Condenser/Drycooler Model # Condenser/Drycooler Serial #

Room Temperature/Humidity °% Ambient Temperature °

Not all units will have all components. To determine your unit’s configuration, compare the Indoor Unit Model # above and
the information in the Components and Nomenclature section.

Good maintenance practices are essential to minimizing operation cost and maximizing product life. Read and follow all
applicable maintenance checks listed below. At a minimum, these checks should be performed semi-annually. However,
maintenance intervals may need to be more frequent based on site-specific conditions. Review the unit user manual for
further information on unit operation. We recommend the use of trained and authorized service personnel, extended service
contracts, and factory certified replacement parts. Contact your local sales representative for more details.

Check all that apply:

Evaporator/Filters

o Check/Replace filters.

o Make sure that the grille area isunrestricted.

o Wipe section clean.

o Coil clean

o Clean the condensate pan.

o Clean the trap in the condensate drain.

o Check/test the filter-clog switch operation (if equipped).

Blower Section (EC fan)

o Verify that the mounting bolts are tight.

o Fan guard bolts tight

o Confirm that the impeller spins freely.

o Check/test the air sail switch (if equipped).

o Check the motor amp draw.

o Compare to nameplate amps.

#1 L1 L2 L3

#2 L1 L2 L3

#3 L1 L2 L3

o Check the belt tension and condition (replace if needed).

o Check the sheave/pulley (replace if worn).

10 Preventive Main tenan ce Checklist

53

Condensate Pump (if equipped)

o Check for debris in the sump.

o Check the operation of float(s) (free movement).

o Check/clean the discharge check valve.

Electrical Panel

o Check the fuses.

o Check the contactors for pitting (replace if pitted).

o Check/re-torque the wire connections.

Controls

o Check/verify the control operation (sequence).

o Check/test the changeover device(s) (if equipped).

o Check/test the water detection device(s) (if equipped).

o Check/test the CAN connection between the indoor and outdoor units (if equipped).

Refrigeration Piping

o Check the refrigerant lines (clamps secure/no rubbing/no leaks).

o Check for moisture (sight glass).

o Check for restriction temperature drop across filter drier.

54

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

Compressor Section

o Check the oil level.

o Check for oil leaks

o Check the compressor mounts (springs/bushings).

o Verify that the cap tubes are not rubbing.

o Check/re-torque the wire connections (inside the compressor box).

o Check the compressor operation (vibration/noise).

o Check the crank-case heater fuses/operation.

o Check for refrigerant leaks.

o Suction pressure

o Discharge pressure

o Superheat

o Low pressure switch cut out

o Low pressure cut in

o High pressure cut out

Circuit #1 _______ Circuit #2 _______

Circuit #1 _______ Circuit #2 _______

Circuit #1 _______ Circuit #2 _______

Circuit #1 _______ Circuit #2 _______

Circuit #1 _______ Circuit #2 _______

Circuit #1 _______ Circuit #2 _______

o Amp draw

Circuit #1A L1 L2 L3

Circuit #1B L1 L2 L3

Circuit #2A L1 L2 L3

Circuit #2B L1 L2 L3

10 Preventive Main tenan ce Checklist

55

Liebert® MCV Condenser

o Make sure that the coil is clean of debris (clean coil if required).

o Verify that the fans are free of debris.

o Ensure that the fans are securely mounted.

o Confirm that the motor bearings are in good condition.

o Check all refrigerant lines for vibration isolation. Support as necessary.

o Check for refrigerant leaks.

o Check the surgeprotection device (if installed) status-indicator lights.

o Check/Re-torque the wire connections.

o Check the contactors for pitting (replace if pitted).

o Verify the operation sequence/setpoints.

o Charge verification:

Outdoor Ambient Temperature__________

Subcooling__________

Indoor unit return air temperature__________

Receiver sight-glass level _________

o Motor amp draw

#1 L1 L2 L3

#2 L1 L2 L3

#3 L1 L2 L3

#4 L1 L2 L3

#5 L1 L2 L3

#6 L1 L2 L3

#7 L1 L2 L3

#8 L1 L2 L3

#9 L1 L2 L3

#10 L1 L2 L3

#11 L1 L2 L3

#12 L1 L2 L3

#13 L1 L2 L3

#14 L1 L2 L3

#15 L1 L2 L3

#16 L1 L2 L3

56

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

Liebert® EconoPhase Pumped Refrigerant Economizer

o Check for refrigerant leaks.

o Check/re-torque the wire connections.

o Check the contactors for pitting (replace if pitted).

o Verify the pump-speed control operation.

o Check the pump mounting.

10 Preventive Main tenan ce Checklist

57

MAINTENANCE NOTES

Name

Signature

Company

Make photocopies for your records. Compare readings/information to previous maintenance worksheet.

To locate your local Vertiv representative for Vertiv-engineered parts, check https://www.Vertiv.com/en-us/support/ or Call
1-800-543-2778.

58

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

APPENDICES

Appendix A: Technical Support and Contacts

A.1 Technical Support/Service in the United States

Vertiv™ Group Corporation

24x7 dispatch of technicians for all products.

1-800-543-2378

Liebert® Thermal Management Products

1-800-543-2778

Liebert® Channel Products

1-800-222-5877

Liebert® AC and DC Power Products

1-800-543-2378

A.2 Locations

United States

Vertiv Headquarters

1050 Dearborn Drive

Columbus, OH, 43085, USA

Europe

Via Leonardo Da Vinci 8 Zona Industriale Tognana

35028 Piove Di Sacco (PD) Italy

Asia

7/F, Dah Sing Financial Centre

3108 Gloucester Road

Wanchai, Hong Kong

59

This page intentionally left blank

60

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

Appendix B: Submittal Drawings

Table B.1 Submittal Drawings Contents

Docu ment Num ber Title

Component Location

DPN004368 Liebert®DSECabinet Dimension Data DA250, DA265 with Horizontal Discharge

Dimension Planning Drawings — Downflow Units

DPN004366 Liebert®DSE Cabinet Dimensional Data DA250, DA265 with Horizontal Discharge

DPN004516 Liebert® DSE Cabinet Dimensional Data DA250, DA265 with Bottom Discharge

DPN004514 Liebert® DSE Installation and Service Clearance Data DA250, DA265

DPN004581 Liebert® DSE Floor Planning for Adjacent DA250, DA265 Units

Dimension Planning Drawings — Floor Stands

DPN004511 Liebert®DSE Floor Stand Dimensional Data DA250, DA265

Electrical Field ConnectionDrawings

DPN004797 Liebert®DSE Electrical Field Connections DA250, DA265 Downflow Models

DPN003886

Electrical Unit to Unit Networking

DPN004351

Piping General A rr angement Drawings

DPN004476 Liebert®Piping Schem atic DA125, DA150, DA165, DA250 with Liebert® MCV

DPN005206 Liebert®DSEP iping Schematic DA265 withLiebert®MCV

Piping Connection Drawings

DPN004208 Liebert®DSE Primary Connection Locations DA250, DA265

Refrigeration PipingLayout and Condenser Positioning Drawings

DPN003965 Liebert® DSEAir Cooled Piping Schematic Liebert®MCV Mounted above Liebert®DA125-250

DPN005207 Liebert® DSE Air Cooled P iping Schematic Liebert® MCV Mounted above DA265

Filter Replacement Drawings

DPN005217 Liebert® DSE Filter Replacement DA250, DA265

Liebert®Heat Rejection Skid CANbus and Interlock Connections Liebert®MCV and Liebert®MCV
EconoPhase and Base Assembly

Liebert®iCOM™ Unit to Unit Network Connections (Liebert® CW, Liebert® CWA, Liebert® DS, Liebert® DSE,
Liebert®P DX, Liebert® PCW

61

COMPONENT LOCATION DIAGRAM

1. Blower/Motor (Typical 3)

2. Line Reactor Transformers (Typical 3)

3. Evaporator Coil

4. Air Filters

5. Condensate Pump (optional)

6. Compressor Compartment

7. Electric Panel

8. 575v Step Down Transformer

9. VFD Assemblies (Typical 3)

LIEBERT® DSE

DA250, DA265

1

9 9

2

7

2

2

9

3 Filter removed for clarity

4

Form No.: DPN001040_REV4

DPN004368
Page :1 /1

6

8

5

REV : 2
REV DATE : 1/20

60 1/8"
1528mm

Fan

Section

LIEBERT® DSE

CABINET DIMENSIONAL DATA

DA250, DA265 W/ HORIZONTAL DISCHARGE

83 1/2"
2122mm

For Unit Disassembly Data

120 1/8"
3051mm

Top View

Refer to DPN004369

44 3/8"
1127mm

70"
1779mm

Louvers

59"
1499mm

Front View

(Data Hall Side)

118 3/8"
3007mm

Louvers

134 1/8"
3406mm

(Service on Gallery Side)

Notes:

1. Louvers in non-raised floor application.

Rear View

Form No.: DPN001040_REV4

DPN004366
Page :1 /1

REV : 3
REV DATE : 1/20

60 1/8"
1528mm

Fan

Section

LIEBERT® DSE

CABINET DIMENSIONAL DATA

DA250, DA265 W/ BOTTOM DISCHARGE

83 1/2"
2122mm

120 1/8"
3051mm

Top View

For Unit Disassembly Data

Refer to DPN004369

44 3/8"
1127mm

Front View

(Data Hall Side)

134 1/8"
3406mm

Rear View

(Service on Gallery Side)

Form No.: DPN001040_REV4

DPN004516
Page :1 /1

REV : 3
REV DATE : 1/20

LIEBERT® DSE

INSTALLATION & SERVICE CLEARANCE DATA DA250, DA265

INSTALLATION, REPLACEMENT FROM DATA CENTER SIDE, MAINTENANCE FROM GALLERY

Fan service zone
Piping & Cables

Data Hall

88"
(2235mm)

Installation and replacement
clearance for full unit

must not be
routed in this zone.

Gallery Side

Data Hall

68"
(1727mm)

Installation and coil replacement
service clearance with disassembly

Electrical
Panel
Access

42"
(1067mm)

Fan service zone
Piping & Cables
must not be
routed in this zone.

Gallery Side

Form No.: DPN001040_REV4

DPN004514
Page :1 /3

Electrical
Panel
Access

42"
(1067mm)

REV : 2
REV DATE : 1/20

LIEBERT® DSE

INSTALLATION & SERVICE CLEARANCE DATA DA250, DA265

INSTALLATION, SERVICE, AND MAINTENANCE FROM GALLERY

Fan service zone
Piping & Cables
must not be
routed in this zone.

Data Hall

Gallery Side

Data Hall

88"
(2235mm)

Full Unit and
Electrical Panel
Access

Fan service zone
Piping & Cables
must not be
routed in this zone.

Gallery Side

Form No.: DPN001040_REV4

DPN004514
Page :2 /3

68"
(1727mm)

Unit Disassembly access
and Electrical Panel access

REV : 2
REV DATE : 1/20

LIEBERT® DSE

INSTALLATION & SERVICE CLEARANCE DATA DA250, DA265

PERIMETER INSTALLATION AND SERVICE CLEARANCE

Fan service zone
Piping & Cables
must not be
routed in this zone.

Data Hall

Full Unit and
Electrical Panel
access

88"
(2235mm)

Fan service zone
Piping & Cables
must not be
routed in this zone.

Data Hall

Form No.: DPN001040_REV4

DPN004514
Page :3 /3

68"
(1727mm)

Unit Disassembly access
and Electrical Panel access

REV : 2
REV DATE : 1/20

LIEBERT® DSE

FLOOR PLANNING

FOR ADJACENT DA250, DA265 UNITS

Data Hall Side

Gasketing shown is for pictorial
purposes only to show edges of
unit that require gap sealing.
Gasketing and method to be
provided and applied by others
in the field.

Form No.: DPN001040_REV4

Notes:

1. Gap is measured between frame memebrs of adjacent units.

DPN004581
Page :1 /1

A

Data Hall Side

1

3/4"

Minimum Gap to be filled with

gasketing between each unit

19mm

DETAIL A

REV : 1
REV DATE : 1/20

LIEBERT® DSE

Height in. ( mm )

FLOORSTAND DIMENSIONAL DATA

DA250, DA265

36 3/8"
924mm

33 7/8"
860mm

2

2

46"
1168mm

46"
1168mm

116 1/4"
2953mm

2

2

2

33 7/8"
860mm

36 3/8"
924mm

2

2

39 1/4"
997mm

Typ. (2) Plcs.

2

78 1/2"
1994mm

Typ.

2

1 3/4"
44mm

Typ.

1 3/4"
44mm

2

Typ.

2

Top View

Notes:

1. Leveling feet are provided with u 1-1/2” (38mm) adjustment from nominal height “A”.

2. Dimensions are to center of feet.

DPN004511
Page :1 /1

Form No.: DPN001040_REV4

119 3/4"
3042mm

Overall

Width

Front View

A

82"
2083mm

Overall

Depth

Right Side View

A

1

24 (610)
30 (762)

36 (914)
42 (1069)
48 (1219)

REV : 1
REV DATE : 1/20

LIEBERT® DSE

ELECTRICAL FIELD CONNECTIONS

DA250, DA265 DOWNFLOW MODELS

STANDARD ELECTRICAL CONNECTIONS

1) High voltage entrance - Located in bottom and top of box (quantity 3)

2) Low voltage entrance – Located in bottom and top of box (quantity 4)

3) Three phase electrical service - Terminals are on top of disconnect switch. Three phase service not

provided by Liebert.

4) Earth ground - Terminal for field supplied earth grounding wire and component ground terminal strip.

Earth grounding required for Liebert units.

5) Unit factory installed disconnect switch and Main Fuses – Access to the high voltage electric panel

compartment can be obtained only with the switch in the “off” position. Fused disconnects are provided
with a defeater button that allows access to the electrical panel when power is on.

6) Remote unit shutdown - Replace existing jumper between terminals 37 & 38 with field supplied normally

closed switch having a minimum 75VA, 24VAC rating. Use field supplied Class 1 wiring.

7) Customer alarm inputs - Terminals for field supplied, normally open contacts, having a minimum 75VA,

24VAC rating, between terminals 24 & 50, 51, 55, 56. Use field supplied Class 1 wiring. Terminal
availability varies by unit options.

8) Common alarm - On any alarm, normally open dry contact is closed across terminals 75 & 76 for remote

indication. 1 AMP, 24VAC max load. Use Class 1 field supplied wiring.

9) Heat rejection interlock - On any call for compressor operation, normally open dry contact is closed

across terminals 70 & 71 & 230 to heat rejection equipment. 1 AMP, 24VAC max load. Use Class 1 field
supplied wiring.

CANbus ELECTRICAL CONNECTIONS

10) CANbus Connector – Terminal block with terminals 49-1 (CAN-H) and 49-3 (CAN-L) + SH (shield

connection). The terminals are used to connect the CANBus communication cable (provided by others)
from the indoor unit to the Liebert MCV Condenser skid

11) CANbus Cable – CANbus cable provided by others to connect to the outdoor condenser and optional

PRE unit. No special considerations are required when the total external cable connection between the
indoor unit and outdoor unit(s) is less than 450FT (137M). For total external cable connections greater
than 450FT (137M). For external cable connections greater than 450FT (137M), but less than 800FT
(243M) a CANbus isolator is required (Contact Factory).

Cable must have the following specifications:

- Braided shield or foil shield with drain wire

- Shield must be wired to ground at indoor unit

- 22-18AWG stranded tinned copper

- Twisted pair (minimum 4 twists per foot)

- Low Capacitance (15pF/FT or less)

- Must be rated to meet local codes and conditions

- EXAMPLES BELDEN 89207 (PLENUM RATED), OR ALPHA WIRE 6454 CATEGORY 5, 5E, OR
HIGHER

- Do not run in same conduit, raceway, or chase as high voltage wiring.

- For CANbus network lengths greater than 450FT (137M) call Factory.

DPN004797
Page :1 /3

Form No.: DPN001040_REV4

REV : 3
REV DATE : 1/20

LIEBERT® DSE

pair wires.

ELECTRICAL FIELD CONNECTIONS

DA250, DA265 DOWNFLOW MODELS

OPTIONAL ELECTRICAL CONNECTIONS

12) Condensate alarm (with condensate pump option) - On pump high water indication, normally open dry

contact is closed across terminals 88 & 89 for remote indication. 1 AMP, 24VAC max load. Use Class 1
field supplied wiring.

13) Remote humidifier - On any call for humidification, normally open dry contact is closed across terminals 11

& 12 to signal field supplied remote humidifier. 1 AMP, 24VAC max load. Use Class 1 field supplied wiring.

14) Reverse Starter contacts - Normally open dry contact is closed across terminals 102 & 103 for power

supply 1 and 106 & 107 for power supply 2 to indicate the active power feed. 1 AMP, 24VAC max load.
Use Class 1 field supplied wiring.

15) Heat Rejection Power Connection- Terminals are on bottom of fuse block. Use field supplied wiring per

local codes for connection to Heat Rejection unit.

16) Smoke sensor alarm - Factory wired dry contacts from smoke sensor are 91-common, 92-NO, and 93-

NC. Supervised contacts, 80 & 81, open on sensor trouble indication. 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. 1 AMP, 24VAC max load. Use Class 1 field supplied wiring.

17) Analog inputs- Terminals 41, 42, 43, and 44 are user configurable for 0-10V, 0-5V, or 4-20MA.

OPTIONAL LOW VOLTAGE TERMINAL PACKAGE CONNECTIONS

18) Remote unit shutdown - Two additional contact pairs available for unit shutdown (labeled as 37B & 38B,

37C & 38C). Replace jumpers with field supplied normally closed switch having a minimum 75VA, 24VAC
rating. Use field supplied Class 1 wiring.

19) Common alarm - On any alarm, two additional normally open dry contacts are closed across terminals 94 &

95 and 96 & 97 for remote indication. 1 AMP, 24VAC max load. Use Class 1 field supplied wiring.

20) Main fan enabled contact - On VFD enable, normally open dry contact is closed across terminals 84 & 85

for remote indication. 1 AMP, 24VAC max load. Use Class 1 field supplied wiring.

21) LiquiTect shutdown and dry contact - On LiquiTect activation, normally open dry contact is closed across

terminals 58 & 59 for remote indication (LiquiTect sensor ordered separately). 1 AMP, 24VAC max load.
Use Class 1 field supplied wiring.

OPTIONAL COMMUNICATION CONNECTIONS

22) Unit-to-Unit – Plug 64 is reserved for U2U communication

23) Site and BMS – Plug 74 and terminal block 3 are reserved for Site and BMS connections. Plug 74 is an

eight pin RJ45 for a Cat 5 cable. Terminal block 3 is a two position screw terminal block for use with twisted

Form No.: DPN001040_REV4

DPN004797
Page :2 /3

REV : 3
REV DATE : 1/20

LIEBERT® DSE

ELECTRICAL FIELD CONNECTIONS

DA250, DA265 DOWNFLOW MODELS

23 22

2

24

50

102

51

103

55

106

56

107

37C

38C

75

37B

76

38B

94

37

95

38

96

97

80

81

88

91

89

92

70

93

71

230

41

42

58

43

59

44

84

85

11

12

1

A

3

4

24

50

51

7

55

56

75

8

76

94

95

19

96

97

88

12

89

70

71

9

230

58

21

59

84

20

85

11

13

12

102

103

14

106

107

37C

38C

18

37B

38B

37

6

38

80

81

91

16

92

93

41

42

17

43

44

Form No.: DPN001040_REV4

DPN004797
Page :3 /3

DETAIL A

5

15

1

2

10

SH49-1

49-3

11

REV : 3
REV DATE : 1/20

Liebert® MCV + Liebert® ECONOPHASE + BASE ASSY

Liebert

MCV

CONDENSER

Liebert

EconoPhase

Liebert

DSE

TB50

1

CAN H

2

OUTPUT

3

CAN L

TB49

1
2

INPUT

3

JUMPER AND DIPSWTICH

HL

TB50

HL

TB49

DETAIL 3

LOCATION

LIEBERT® HEAT REJECTION SKID

CANbus & INTERLOCK CONNECTIONS

ECONOPHASE CONTROL
BOARDS (FACTORY SET)

CIRCUIT 1

J6

31

ON

SW6

CAN

CANBUS
ADDRESSING
DIPSWITCH

ON

SW6

CAN

J6

31

CANBUS
ADDRESSING
DIPSWITCH

CIRCUIT 2

J6

31

ON

SW6

CAN

CONDENSER CONTROL

BOARDS (FACTORY SET)

CIRCUIT 1

1 3

J6

ON

SW6

CAN

CIRCUIT 2

1 3

J6

ON

SW6

CAN

CANBUS
TERMINATION
JUMPER

NOTE:
ONE Liebert DSE system
shown for simplicity.

3

®

CANBUS COMMUNICATION CABLE

®

3

LOW VOLTAGE
JUNCTION BOX

Form No.: DPN001040_REV4

FACTORY WIRED

FIELD INSTALLED

SEE SHEET 2 FOR

COMPONENT

NOTES, CABLE NOTES, &

WIRE NOTES

DPN003886
Page :1 /2

71

70

SH

49-1

49-3

230

A

B

70

71

230

DETAIL 4 LOW VOLTAGE JUNCTION BOX

DETAIL 2

HEAT REJECTION INTERLOCK (B)

23071

70

B

SH

A

49-1

49-3

DETAIL 1 CANBUS CABLE CONNECTION (A)

SH

49-1

49-3

4

A

B

2

1

®

REV : 4
REV DATE : 2/20

LIEBERT® HEAT REJECTION SKID

CANbus & INTERLOCK CONNECTIONS

Liebert® MCV + Liebert® ECONOPHASE + BASE ASSY

COMPONENT NOTES:

1. COMPONENT APPEARANCE, ORIENTATION, AND POSITION MAY VARY BETWEEN PRODUCT LINES. TERMINAL NAMES REMAIN CONSTANT.

2. ALL CIRCUITS TO THESE CONNECTION POINTS REMAIN CONSTANT.

CAN & CABLE NOTES (A):

1. CABLE MUST HAVE THE FOLLOWING SPECIFICATIONS:

- BRAIDED SHIELD OR FOIL SHIELD WITH DRAIN WIRE

- SHIELD MUST BE WIRED TO GROUND AT INDOOR UNIT

- 22-18AWG STRANDED TINNED COPPER

- TWISTED PAIR (MINIMUM 4 TWISTS PER FOOT)

- LOW CAPACITANCE (15pF/FT OR LESS)

- MUST BE RATED TO MEET LOCAL CODES AND CONDITIONS.

- EXAMPLES BELDEN 89207 (PLENUM RATED), OR ALPHA WIRE 6454 CATEGORY 5, 5E, OR HIGHER.

2. DO NOT RUN IN SAME CONDUIT, RACEWAY, OR CHASE AS HIGH VOLTAGE WIRING.

3. FOR CANBUS NETWORK LENGTHS GREATER THAN 450FT(137M), CONTACT LIEBERT FACTORY.

INTERLOCK WIRE NOTES (B):

1. FIELD SUPPLIED WIRE

- 3 CONDUCTOR 18AWG OR GREATER

- RATED 600V

2. RUN FIELD SUPPLIED WIRES BETWEEN THE INDOOR UNIT AND THE LOW VOLTAGE JUNCTION BOX.

Form No.: DPN001040_REV4

DPN003886
Page :2 /2

REV : 4
REV DATE : 2/20

LIEBERT® iCOM™

TB3

P

UNIT TO UNIT NETWORK CONNECTIONS

LIEBERT® CW, LIEBERT® CWA, LIEBERT® DS, LIEBERT® DSE,

LIEBERT® PDX, LIEBERT® PCW

RS485

SITE AND BMS

COMMUNICATION

ETHERNET

CONNECTIONS

+

1 2

-

A

TB3

P75

P95 DVI-D CABLE CONNECTION
TO 7-INCH ICOM DISPLAY

P71 P72

P76

P95

P74 P64

iCOM™

MICROPROCESSOR

AND I/O BOARD

P100

E5

7
6
P

6
6
P

1

2

1

1

P

P

1

0

2

2

P

P

3
1
P

7
P

P100 POWER SUPPLY TO
7-INCH ICOM DISPLAY

DETAIL A

ETHERNET CABLE
(FIELD SUPPLIED)

UNIT-TO-UNIT NETWORKING SWITCH

(FIELD SUPPLIED)

TO / FROM OTHER

NETWORKED UNITS

Form No.: DPN001040_REV4

DPN004351
Page :1 /2

REV : 4
REV DATE : 2/20

LIEBERT® iCOM™

UNIT TO UNIT NETWORK CONNECTIONS

LIEBERT® CW, LIEBERT® CWA, LIEBERT® DS, LIEBERT® DSE,

LIEBERT® PDX, LIEBERT® PCW

ETHERNET CABLE
(FIELD SUPPLIED)

P71

TB3

P76

P75

P95

P95 DVI-D CABLE CONNECTION
TO 7-INCH ICOM DISPLAY

P72

P74 P64

iCOM™

MICROPROCESSOR

AND I/O BOARD

E5

7
6
P

6
6
P

1

2

1

1

P

P

0

1

2

2

P

P

3
1
P

P100

P100 POWER SUPPLY TO
7-INCH ICOM DISPLAY

7
P

TB3

P75

P95 DVI-D CABLE CONNECTION
TO 7-INCH ICOM DISPLAY

P71

P76

P95

P72

P74 P64

iCOM™

MICROPROCESSOR

AND I/O BOARD

P100

E5

7
6
P

6
6
P

1

2

1

1

P

P

0

1

2

2

P

P

3
1
P

7
P

P100 POWER SUPPLY TO
7-INCH ICOM DISPLAY

Form No.: DPN001040_REV4

DPN004351
Page :2 /2

NOTE* For dual-unit network configurations only

REV : 4
REV DATE : 2/20

DA125, DA150, DA165 & DA250 with LIEBERT MCV

LIEBERT MCV HEAT REJECTION SKID

LIEBERT MCV CONDENSER

LIEBERT DSE

PIPING SCHEMATIC

Differential
Check Valve

LIEBERT DSE

RECEIVER

Optional "EconoPhase" UNIT

Check
Valve

Differential
Check Valve

Liquid to Indoor Unit

2

Solenoid
Valve

9

Ball Valve

6

For rises over
25ft. (7.6m), trap
every 20ft. (6m)
or evenly divided*

INTERCONNECTING
PIPING

LIEBERT DSE

Electronic
Expansion
Valve

Service
Valve

LIQUID RETURN

2

Service
Valve

Check
Valve

LIQUID

Check
Valve

Filter Drier

Ball Valve

SUCTION

HOT GAS DISCHARGE

2

EVAPORATOR

COIL

Sight Glass

FACTORY REFRIGERANT PIPING
FIELD PIPING

Notes:

1. Two refrigeration circuits provided. Single refrigeration circuit shown for clarity.

2. Circuit 1 must be maintained between indoor unit, condenser and EconoPhase unit. Circuit 2 must be maintained between indoor unit, condenser and EconoPhase unit.

3. Schematic representation shown. Do not use for specific connection locations.

4. The outlet of the receiver must be higher than the elevation of the EEV inside the indoor unit. This vertical height must not exceed 60ft. (18.3m). Liebert DSE Receiver required
for systems with or without EconoPhase unit.

5. All indoor and outdoor field refrigerant piping must be insulated, 1/2" minimum thickness. All outdoor insulation must be UV and ozone resistant.

6. Components are not supplied by Liebert but are required for proper circuit operation and maintenance (DA250 with top piping has internally installed traps on the discharge lines).

7. Traps must be installed and horizontal lines pitched to ensure proper oil return and to reduce liquid flood back to compressor. Pitch horizontal gas piping at a minimum of
1/2" per 10 feet (42mm per 10m) so that gravity will aid in moving oil in the direction of the refrigeration flow.

8. Do not isolate any refrigeration circuits from over pressurization protection.

SERVICE/SCHRADER (ACCESS) CONNECTION, NO VALVE CORE.

SERVICE/SCHRADER (ACCESS) CONNECTION, WITH VALVE CORE.

2
Hot Gas
Discharge
from Indoor
Unit

Trap at base of risers

6

over 5ft. (1.5m)*

Form No.: DPN001040_REV4

9. Typical location for Sight Glass on DA150 and DA165. On DA125, Sight Glass is located between Filter Drier and Electronic Expansion Valve.

DPN004476
Page :1 /1

REV : 2
REV DATE : 9/19

LIEBERT® DSE

DA265 with LIEBERT

MCV

Liebert

MCV HEAT REJECTION SKID

Optional

Liebert

EconoPhase" UNIT

Liebert

MCV CONDENSER

Liebert

DSE

PIPING SCHEMATIC

®

®

®

®

Differential
Check Valve

Service
Valve

Ball Valve

LIQUID

SUCTION

®

Check
Valve

Solenoid
Valve

EVAPORATOR

COIL

Ball Valve

Differential
Check Valve

Liquid to Indoor Unit

2

2
Hot Gas
Discharge
from Indoor
Unit

6

For rises over
25ft. (7.6m), trap
every 20ft. (6m)
or evenly divided*

Check
Valve

Service
Valve

Check
Valve

Filter Drier

Electronic
Expansion
Valve

Sight Glass

LIQUID RETURN

2

FACTORY REFRIGERANT PIPING
FIELD PIPING

Notes:

1. Two refrigeration circuits provided. Single refrigeration circuit shown for clarity.

2. Circuit 1 must be maintained between indoor unit, condenser and EconoPhase unit. Circuit 2 must be maintained between indoor unit, condenser and Liebert EconoPhase unit.

3. Schematic representation shown. Do not use for specific connection locations.

4. The bottom of the condenser coil must be no greater than 60 ft (18.3m) above and less than 15 ft (4.6m) below the elevation of the EEV inside the indoor unit.

5. All indoor and outdoor field refrigerant piping must be insulated, 1/2" minimum thickness. All outdoor insulation must be UV and ozone resistant.

6. Components are not supplied by Liebert but are required for proper circuit operation and maintenance (DA265 with top piping has internally installed traps on the discharge lines).

7. Traps must be installed and horizontal lines pitched to ensure proper oil return and to reduce liquid flood back to compressor. Pitch horizontal gas piping at a minimum of
1/2" per 10 feet (42mm per 10m) so that gravity will aid in moving oil in the direction of the refrigeration flow.

8. Do not isolate any refrigeration circuits from over pressurization protection.

SERVICE/SCHRADER (ACCESS) CONNECTION, NO VALVE CORE.

SERVICE/SCHRADER (ACCESS) CONNECTION, WITH VALVE CORE.

HOT GAS DISCHARGE

2

INTERCONNECTING
PIPING

Trap at base of risers

6

over 5ft. (1.5m)*

®

DPN005206
Page :1 /1

Form No.: DPN001040_REV4

REV : 0
REV DATE : 2/20

LIEBERT® DSE

Top View

Bottom View

PRIMARY CONNECTION LOCATIONS

DA250, DA265

A

B

Service Side View

A

HG C2

Y

O

LIQ C1

O

LIQ C2

Y

HG C2

HV1

HV2

HR HV

HR HV

HV1
HV2

LV1
LV2
LV3

HR LV

Service Side of Unit

HR LV

LV3

View A-A

(Top View)

LV1

LV2

2

3

CD

HG C1

HG C1
LIQ C1

X

1

X

B

View B-B

(Bottom View)

POINT Description

HR HV Heat Rejection High Voltage 117-1/2 (2984) 4-1/2 (113) 114-3/8 (2904) 5-3/8 (136)
HR LV Heat Rejection Low Voltage 114-3/4 (2914) 4-3/4 (122) 86-1/8 (2189) 6-5/8 (168)
HV1 10-5/8 (269) 114-3/8 (2904)

Electrical Conn. (High Volt) 117-12 (2984) 8-1/8 (206)

HV2 7-1/4 (183) 111 (2818)
LV1 10-3/4 (274) 5-5/8 (142)

Electrical Conn. (Low Volt)

LV2 8-3/4 (223) 7-5/8 (193)
LV3 6-3/4 (172) 86-1/8 (2189) 8-5/8 (218)
CD Condensate Drain N/A N/A 8-5/8 (218) 7-5/8 (193) 3/4" NPT Female
CP Condensate Drain w/ Optional Pump 1-1/4 (32) 3-7/8 (98) N/A N/A 1/2" O.D. Cu
LIQ C1 4-3/4 (121) 4-5/8 (117) 7-5/8 (192) 4-5/8 (117)

Liquid Circuit

LIQ C2 2 (51) 7-5/8 (193) 4-7/8 (123) 7-5/8 (192)
HG C1 4-3/4 (121) 10-5/8 (270) 7-5/8 (192) 10-5/8 (269)

Hot Gas Circuit

HG C2 2 (51) 13-5/8 (346) 4-7/8 (123) 13-5/8 (346)

2

3

3

X in. (mm) Y in. (mm) X in. (mm) Y in. (mm)

114-3/4 (2914)

84-1/8 (2138)

Connection Size/Opening

1-1/2"

2-1/2"

1-1/2"

1-3/8" O.D. Cu

1-5/8" O.D. Cu

3

LIQ C2

CP

1

Form No.: DPN001040_REV4

Notes:

1. Drawing not to scale. All dimensions from right corner on service side and have a tolerance of ± 1/2" (13mm).

2. Field pitch Condensate Drain line a minimum of 1/8" (3.2mm) per 12" (305mm). All units contain a factory installed condensate trap. Do not trap external to the unit.
Select appropriate drain system materials. The drain must comply with all local codes.

3. Unit has internally installed traps on the discharge lines. For rises over 25ft. (7.6m), trap every 20ft. (6m) or evenly divided.

4. Piping connection can be made at the top or bottom of the unit.

DPN004208
Page :1 /1

REV : 5
REV DATE : 1/20

CIRCUIT 1

Notes:

he vertical

Unit piping entrance varies by unit and may be through

insulated, ½ inch minimum. All outdoor insulation must

Notes:

Liebert

MCV Condenser

Liebert

EconoPhase

Liebert

DSE

®

®

Unit

Unit

LIEBERT® DSE

AIR COOLED PIPING SCHEMATIC

Liebert® MCV MOUNTED ABOVE DA125-250

CIRCUIT 2

44 1/2inch
1130mm

1

1. The outlet of the receiver must be higher than the

elevation of the EEV inside the indoor unit. T
height must not be greater than 60 ft (18.3 m).

2. Unit must be trapped at bottom of riser with any rise

over 5 feet (1.5m) high. If rise exceeds 25 feet (7.5m),
then a trap is required in 20 foot (6.1m) increments or
evenly divided. DA250 with horizontal discharge has
internally installed traps on the hot gas discharge line.

3. Pitch horizontal hot gas piping at a minimum of

½ inch per 10 feet (42mm per 10m) so that gravity will
aid in moving oil in the direction of the refrigeration
flow.

4.

the top of the unit.

5. All indoor and outdoor field refrigerant piping must be

be UV and ozone resistant.

6. Consult factory for any exceptions to the above

guidelines.

Internal EEV Height H inch ( mm)

DA125-DA165 43 (1092)

DA250 56 (1422)

Liquid
Return

Liquid
Return

Liquid
Return

Hot Gas
Discharge

Hot Gas
Discharge

60ft

1

18.3m

Maximum Vertical

Rise

H

Hot Gas
Discharge

Liquid
Return

Field Piping

®

DA250 with horizontal discharge should be piped out
the top of unit.

DPN003965
Page :1 /2

Form No.: DPN001040_REV4

REV : 4
REV DATE : 3/20

LIEBERT® DSE

Notes:

Notes:

Liebert

MCV Condenser

Liebert

EconoPhase

Liebert

DSE

AIR COOLED PIPING SCHEMATIC

Liebert® MCV AND DA125-250 AT SIMILAR LEVEL

CIRCUIT 1

®

®

Unit

Unit

CIRCUIT 2

44 1/2inch
1130mm

1

®

H

1

DA250 with horizontal discharge should be piped out
the top of unit.

DPN003965
Page :2 /2

Form No.: DPN001040_REV4

Hot Gas

Hot Gas

Liquid
Return

1. The outlet of the receiver must be higher than the elevation of the EEV inside the indoor unit.

2. Unit must be trapped at bottom of riser with any rise over 5 feet (1.5m) high. If rise exceeds 25 feet (7.5m), then a trap is required in 20 foot

(6.1m) increments or evenly divided. DA250 with horizontal discharge has internally installed traps on the hot gas discharge line.

3. Pitch horizontal hot gas piping at a minimum of ½ inch per 10 feet (42mm per 10m) so that gravity will aid in moving oil in the direction of the

refrigeration flow.

4. Unit piping entrance varies by unit and may be through the top of the unit.

5. All indoor and outdoor field refrigerant piping must be insulated, ½ inch minimum. All outdoor insulation must be UV and ozone resistant.

6. Consult factory for any exceptions to the above guidelines.

Discharge

Hot Gas Discharge

Discharge

Liquid
Return

Liquid
Return

Internal EEV Height H inch ( mm)

DA125-DA165 43 (1092)

DA250 56 (1422)

Field Piping

REV : 4
REV DATE : 3/20

CIRCUIT 1

Notes:

Unit piping entrance varies by unit and may be through

Notes:

Liebert

MCV Condenser

Liebert

EconoPhase

®

®

Unit

Unit

LIEBERT® DSE

AIR COOLED PIPING SCHEMATIC

Liebert® MCV MOUNTED ABOVE DA265

CIRCUIT 2

1. The bottom of the condenser coil must be no greater

than 60 ft (18.3m) higher than the elevation of the EEV
inside the indoor unit.

2. Unit must be trapped at bottom of riser with any rise

over 5 feet (1.5m) high. If rise exceeds 25 feet (7.5m),
then a trap is required in 20 foot (6.1m) increments or
evenly divided. DA265 with horizontal discharge has
internally installed traps on the hot gas discharge line.

3. Pitch horizontal hot gas piping at a minimum of

½ inch per 10 feet (42mm per 10m) so that gravity will
aid in moving oil in the direction of the refrigeration
flow.

4.

the top of the unit.

5. All indoor and outdoor field refrigerant piping must be

54 7/8"
1393mm

1

insulated, ½ inch minimum. All outdoor insulation must
be UV and ozone resistant.

6. Consult factory for any exceptions to the above

guidelines.

Liquid
Return

Liquid
Return

Hot Gas
Discharge

Hot Gas
Discharge

60ft

18.3m

1

Maximum Vertical

Rise

H

Internal EEV Height H inch ( mm)

DA265 56 (1422)

Field Piping

DPN005207
Page :1 /2

Form No.: DPN001040_REV4

Liquid
Return

Hot Gas
Discharge

Liquid
Return

DA265 with horizontal discharge should be piped out
the top of unit.

REV : 0
REV DATE : 2/20

LIEBERT® DSE

Notes:

Notes:

Liebert

MCV Condenser

Liebert

EconoPhase

AIR COOLED PIPING SCHEMATIC

Liebert® MCV AND DA265 AT SIMILAR LEVEL

CIRCUIT 1

®

®

Unit

Unit

CIRCUIT 2

Liquid
Return

Hot Gas
Discharge

Hot Gas Discharge

54 7/8"
1393mm

1

H

1

Hot Gas
Discharge

DA265 with horizontal discharge should be piped out
the top of unit.

Liquid
Return

DPN005207
Page :2 /2

Form No.: DPN001040_REV4

Liquid
Return

1. The bottom of the condenser coil must be less than 15ft(4.6m) below the elevation of the EEV inside the indoor unit.

2. Unit must be trapped at bottom of riser with any rise over 5 feet (1.5m) high. If rise exceeds 25 feet (7.5m), then a trap is required in 20 foot

(6.1m) increments or evenly divided. DA265 with horizontal discharge has internally installed traps on the hot gas discharge line.

3. Pitch horizontal hot gas piping at a minimum of ½ inch per 10 feet (42mm per 10m) so that gravity will aid in moving oil in the direction of the

refrigeration flow.

4. Unit piping entrance varies by unit and may be through the top of the unit.

5. All indoor and outdoor field refrigerant piping must be insulated, ½ inch minimum. All outdoor insulation must be UV and ozone resistant.

6. Consult factory for any exceptions to the above guidelines.

Internal EEV Height H inch ( mm)

DA265 56 (1422)

Field Piping

REV : 0
REV DATE : 2/20

LIEBERT® DSE

FILTER REPLACEMENT

DA250, DA265

Filters accessed through
gallery side service door.

Filters are removed and installed through
this position of the filter rack.

Form No.: DPN001040_REV4

Unit side panels, fan deck and compressor
module hidden for clarity.

DPN005217
Page :1 /1

REV : 0
REV DATE : 02/12/20

This page intentionally left blank

62

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

Vertiv | Liebert ® DSE Thermal Management S ystem In staller/User Guide

Vertiv.com | Vertiv Headquarters, 1050 Dearborn Drive, Columbus, OH, 43085, USA

© 2020Vertiv Group Corp. All rights reserved. Vertiv and the Vertiv logo are trademarks or registeredtrademarks of Vertiv Group Corp. All other names and logos referred to are trade
names, trademarks or registered trademarks of their respective owners. While ev ery precaution has been taken to ensure accuracy and completeness herein, Vertiv Group Corp.
assumes no responsibility, and disclaims all liability, for damages resulting from use of this information or for a ny errors or omissions. Specifications are subject to change without
notice.

SL-18945_REV5_06-20