Vertiv Liebert PDX User manual

Liebert®PDX
80-165 kW Indoor Room Cooling Units
with Modulating Capacity
Econophase Version - 50 Hz
User Manual
English, Cod. 265133, rev. 29.08.2019
Use only with:
● Liebert®MC, EconoPhase Version
● Liebert®EconoPhase, Pumped Refrigerant Module

Liebert®PDX, EconoPhase Version - UM - 265133 - 29.08.2019

Liebert®PDX, EconoPhase Version - UM - 265133 - 29.08.2019
IMPORTANT SAFETY INSTRUCTIONS
SAVE THESE INSTRUCTIONS
This document, written in English, is the original version.
Conventions
DANGER indicates a hazardous situation which, if not avoided, will result in death or serious injury.
WARNING indicates a hazardous situation that, if not avoided, could result in death or serious injury.
CAUTION indicates a hazardous situation that, if not avoided, may result in minor or moderate injury.
NOTICE indicates a property damage message.
WARNING
This unit operates and restarts automatically.
If the electrical connection is live, there are residual risks: electric shock, burns, moving parts, automatic
restarting from the remote control.
• Before any operation that requires opening of the door or the equipment panels (maintenance,
cleaning, etc.), disconnect the unit from the power supply.
The ON/OFF switch on the control panel does not isolate the power from the unit, even in the “unit o󰀨”
mode. To cut o󰀨 the power supply, open the insulation device (main switch) which is positioned on the
electrical panel cover, behind the door on the left:
WARNING
This manual was prepared to enable the end user to carry out only the operation that can be done with
the panels closed.
Only qualied personnel are allowed to carry out operations that require opening of the door or the
equipment panels. The panel key supplied with the unit must be kept by a person responsible for the
maintenance.
CAUTION
Before proceeding with installation, read all instructions, verify that all parts are included and check the
nameplate to make sure the voltage matches available utility power.
For identication of the unit (model and serial no.) in case of the necessity for assistance or spare parts,
locate the identication label on the outside of the unit.
NOTICE
The manual is retained for the entire service life of the machine;
The user reads the manual carefully before carrying out any operations on the machine;
The unit control must be used exclusively for the purpose which it is intended for; the manufacturer
takes no liabil ity in case of an incorrect use or a modication of the unit control
MAIN SWITCH
Unscrew the door and open it to access the main switch.
• After opening the door pay attention to the cable and components still energized.
• Open the main switch to cut o󰀨 the power before removing any protective cover.

Liebert®PDX, EconoPhase Version - UM - 265133 - 29.08.2019
WARNING
The supply cable of the main switch contains live high-voltage.
• The manufacturer highly recommends that the nal customer installs on site an external main switch,
easy to reach and to facilitate a quick and easy shutdown enabling the power of the unit to be cut o󰀨.
Refer to the unit electrical schematics for the installation. Follow all local codes.
CAUTION
If the unit door is open while the fans are operating, the airow may suddenly slam the door closed.
There is a risk of being hit by the door and hands being crushed.
• Before opening the door, switch o󰀨 the unit using the local or remote control panel or the external
main switch (if installed).
If small objects are left loose in the fans bay after any maintenance operation, it may result in the object
ejection at the fans start-up.
There is a risk of being hit by small objects.
• Install all protection panels or a grid before starting up the fans after any maintenance operation.
Position the oor panels also below the unit with the fans below the oor.
WARNING
If the internal compartments are open immediately after the machine has been switched o󰀨, there might
be some hazards related to:
• Components still at high temperature: electrical heaters, humidier and steam distributor, hot water
piping.
• Rotating elements (fan impellers, they might continue to rotate for a while by inertia)
• Sharp edges, splinters and exposed fasteners
Pay attention to the warning labels on the unit.

Liebert®PDX, EconoPhase Version - UM - 265133 - 29.08.2019
Attention: data relevant to the unit supplied is indicated
on the inboard label (see the blank facsimile below).
Data in the manual is referred to standard conditions
and can be modied without any advance notice.
POS. DESCRIPTION
1 Compressor Full Load Ampere [A]
2 Compressor Locked Rotor Ampere [A]
3 Compressor quantity
4 Evaporator fan Full Load Ampere [A]
5 Evaporator fan Locked Rotor Ampere [A]
6 Evaporator fan quantity
7 Condenser fan Full Load Ampere [A]
8 Condenser fan Locked Rotor Ampere [A]
9 Condenser fan quantity
10 Electrical heating Ampere
11 Electrical heating steps
12 Humidier Ampere
13 Steam production capacity
14 Max. unit AC Ampere
15 Max. unit DC Ampere
16 Rated peak withstand current
17 Rated short-time current
18 Refrigerant type
19 High pressure switch Stop
20 High pressure switch Restart
21 Low pressure switch Stop
22 Low pressure switch Restart
23 Min. room operation temperature
24 Max. room operation temperature
25 Min. room operation humidity
26 Max. room operation humidity
27 Max. refrigeration circuit pressure
28 Manufacturing plant
29 Manufacturing date
30 Model
31 Serial number
32 Power input
12 3
45 6
78 9
10 11
12 13
14
15
16
17
18
19 20
21 22
23
24
25
26
27
32
30
28
31
29
12
4
7
10
12
14
18
19
21
23
25
27
3
5 6
89
11
15
13
16
17
20
22
24
26
29
28
30
32
31

Liebert®PDX, EconoPhase Version - UM - 265133 - 29.08.2019
Digit 8 - Airow
L= Premium Fan Module
Digit 9 - Main Power Supply
3= Single 400V / 3ph / 50 Hz + N
Digit 10 - Cooling System
X= Dual Circuit Digital Scroll R410A with EEV
Digit 11 - Humidication
0= None
H = Infrared Humidier
U = Ultra Sonic Humidier
S = Electrode Humidier
Digit 12 - Microprocessor Control
2= Inner Display only T sensor
3= Inner Display TH sensor
U = Small Cold re display T sensor
B = Small Cold re display TH sensor
C = Large Cold re display T sensor
D = Large Cold re display TH sensor
Digit 13 - Heating & Re- Heating
0= None
1= Electric heating Std Capacity
2= Electric heating High Capacity
Digit 14 - Air Filter E󰀩ciency
1 = F5 (EU5) dust spot
3 = F5 (EU5) dust spot + Clogged Filter
Digit 15 - Condensing Control
1= Air Cooled or Water cooled with Standard Pressure, 2 way MBV
Digit 16 - Colour
1= Black Vertiv RAL 7021
Digit 17 - High Voltage Option
T= Dual Power Supply parallel + Magnetic circuit breaker for 10A
three phases
U= Dual Power Supply Alternate with ATS + Magnetic circuit
breaker for 10A three phases
Digit 18 - Package Option
H= Predisposition for damper
L= Predisposition for plenum installation
Digit 19 - Monitoring
N= No IS Housing
0= No Card
C= Sitescan Monitoring through INTELLISLOT IS-485EXI
P= MODBUS, BACnet, SNMP, Web through IS-UNITY card
Digit 20 - Sensors
0= None
Digit 21 - Packaging
P= PLP And Pallet
C= PLP and Wooden Crate
S= Seaworthy
Digit 22 - Special Requirements
A= Standard Vertiv
X= Special Vertiv
Model Nomenclature / Digit Numbers
18 9 10 11 12 13 14 15 16 17 18 19 20 21 22 65432
PX
Digit 6
Air Discharge
D Downow Up
E Downow Down
Digit 7
System Type
PAir Cooled + predisposition for
pumped refrigerant economizer
Digit 1 and 2
PX Liebert®PDX
7
Digit 3, 4 and 5
Unit Model

1
Liebert®PDX, EconoPhase Version - UM - 265133 - 29.08.2019
1 - Liebert®PDX EconoPhase
System description
1.1 - Liebert®PDX EconoPhase System
Liebert®PDX EconoPhase System is designed to provide
precision air conditioning to computer racks in a data center or
computer room as e󰀩ciently and e󰀨ectively as possible.
A Liebert®PDX EconoPhase System is composed of:
• Liebert®PDX EconoPhase version - High E󰀩ciency, Digital
Scroll, oor-mounted indoor unit
• Liebert®MC™ Condenser EconoPhase version - Air-cooled
microchannel condenser, premium version
• Liebert®PDX EconoPhase - Liebert®PDX EconoPhase
pump refrigerant module
The Liebert®PDX EconoPhase is an add-on module for use with an
air-cooled Liebert®PDX system. The Liebert®PDX EconoPhase
will allow the system to switch to Liebert®PDX EconoPhase
operation when the outdoor temperature is low enough to provide
the required temperature di󰀨erence between the inside air and the
outside air, providing signicant energy savings because there is
no need to operate the compressor. At lower temperatures, the
system switches one or both circuits from Compressor Mode to
Pump Mode. The pump consumes roughly 1/10th of the power
consumed by the compressor.
The Liebert®PDX EconoPhase system maintains this energy
e󰀩ciency by employing the heat absorption properties of a liquid
(pumped refrigerant) through a phase change. Refrigerant is
pumped as a liquid, becomes a gas within the Liebert®PDX
evaporator and then is returned to the Liebert®MC where it
condenses to a liquid. The subcooled liquid refrigerant from the
condenser is then run directly into the Liebert®PDX EconoPhase
pumps and is circulated back to the Liebert® PDX unit (see Figure
1). The system will operate as a typical air-cooled direct expansion
system when outdoor ambient conditions are unfavorable
to EconoPhase operation. The pumps in the Liebert®PDX
EconoPhase pump module are turned o󰀨 and bypassed during
compressor operation.
Condenser (Pump Mode)
Condenser (DX Mode)
Indoor Unit
ropaVxiMropaV/diuqiL
Liquid
Pressure
Enthalpy
Tradtional Vapor Compression Cycle
EconoPhase Cycle
Fig.1 - Pressure enthalpy diagram, pumped refrigerant Liebert®EconoPhase

2Liebert®PDX, EconoPhase Version - UM - 265133 - 29.08.2019
1.2 - Liebert®PDX EconoPhase version
The Liebert®PDX is a full- featured precision air conditioner
intended for data centers, network closets, technological
rooms (laboratories, metrological rooms, museums), new and
existing constructions, raised and non- raised oors, moderate
to high density heat loads, also in combination with cold aisle
containments (up to 10 kW/Rack). It provides all the necessary
functions of a standard precision air conditioner, including
cooling, heating, humidication, dehumidication, air ltration,
condensate management, temperature control, alarm functions
and data communications. Thanks to Copeland’s Digital Scroll and
electronic expansion valve availability, Liebert®PDX can achieve
a continuous spectrum of capacity output, ensuring a very tight and
precise control on room temperature. Liebert®PDX can rapidly
change from one capacity duty to another. Therefore it controls
environmental parameters even working with swiftly changing heat
loads. In Digital Scroll Cooling system depending on the unit size
the modulating capacity range is between 15% and 100% of the
nominal capacity. The compressor can drop down to 10%, but the
system will decrease in e󰀩ciency.
Thanks to the capacity modulation we can reduce the starting
and stopping of the compressor which uses a lot of power and
puts a great amount of stress on the components; therefore we
can enhance e󰀩ciency and life of the system. With the Liebert®
PDX range we are able to manage unexpected very high ambient
temperatures, maintaining the system active, reducing HP alarm
and troublesome stops of the unit. In fact, when the discharge
pressure reaches the limit value, the compressor capacity is limited
to a fraction of the actual request, in this way restricting the heat
rejection and allowing the system running without interruptions.
If, after a dened time, the condensing pressure comes back
within the limit, the capacity will be modulated in the usual way.
Reliability of the Liebert®PDX is also maximized, thanks to the
fewer system parts and simple electronic controls which reduces
the unit maintenance.
Digital Scroll motor runs at a constant speed throughout the
operating range.
This unique feature increases the applicability of the Liebert®
PDX units into technological rooms, as it eliminates the need
for expensive electromagnetic suppression electronics require
to ensure electromagnetic compatibility. The Digital function
maintains the maximum refrigerant velocity through the pipes. As a
result of these reasons, Liebert®PDX units do not need oil return
components. Liebert®PDX is designed on modular concept.
The Liebert®PDX is supplied as a single unit (height 1970 mm),
where coil and fan sections are connected. The units are available
Downow Up
Downow Down

3
Liebert®PDX, EconoPhase Version - UM - 265133 - 29.08.2019
1.3 - Liebert MC™ EconoPhase Version
The Liebert®MC air-cooled microchannel condenser is a low-
prole, direct-drive propeller fan-type air-cooled unit suitable for
mounting outdoors. It provides heat rejection for either one or two
separate refrigeration circuits, matches the heat rejection capacity
corresponding with the outdoor ambient temperature and with each
corresponding compressor heat rejection requirements.
Constructed with an aluminum cabinet, galvanized steel frame
and microchannel coil, the unit is quiet and corrosion resistant.
The condenser is quickly and easily installed because all internal
wiring is completed at the factory with only electrical connections
and communications connections to be made at the job site. All
electrical connections and controls are enclosed in an integral
weatherproof section of the condenser.
The Liebert®EconoPhase pumped refrigerant system will always
use the premium version condenser.
In EconoPhase operation, the premium control board uses
inputs from the indoor unit, condenser refrigerant temperatures
and ambient temperatures to modulate the EC fan motor speed
from 0 to 100% RPM, maintaining the refrigerant temperature
setpoint. The control system provides temperature control for
outdoor ambient as low as -35°C in pumped refrigerant Liebert®
EconoPhase operation.
1.4 - Liebert®EconoPhase Pump Refrigerant Module
The Liebert®EconoPhase is an option for a Liebert®PDX
EconoPhase Version air-cooled system. The Liebert®EconoPhase
allows an air-cooled direct expansion system to switch from vapor
compression operation to pumped refrigerant operation when
the outdoor temperature is low enough to provide the required
temperature di󰀨erence between the inside air and the outside air.
Fig. 2 - Liebert EconoPhase module
1.5 Standard Air-Cooled System vs. Liebert®PDX
EconoPhase System
There are di󰀨erences between the standard air-cooled system and
a system designed with the Liebert®EconoPhase. The user must
be aware of these di󰀨erences to achieve the best operation. This
section summarizes the di󰀨erences; more detailed explanations
are found throughout this manual and the manual of Liebert®
EconoPhase Pump Refrigerant Module.
• Liebert EconoPhase Operation - Liebert®EconoPhase
operation is possible when the outdoor temperature is low
enough to provide the required temperature di󰀨erence
between the indoor air and the outside air. This mode turns the
compressors O󰀨 and turns the Liebert®EconoPhase pumps
On.
• Refrigerant Pumping - During Liebert®EconoPhase
operation, the refrigerant is pumped around the air-cooled
loop instead of going through the vapor compression cycle.
System pressures will vary signicantly depending on whether
the system is operating in standard aircooled mode or in
Liebert®EconoPhase operation.
• Energy Savings - The coe󰀩cient of performance of the
system increases signicantly during the EconoPhase
operation which results in signicant energy savings for the
user.
• EEV - The system uses an electronic expansion valve during
both direct expansion and EconoPhase operation. The EEV
results in energy savings and helps the pump maintain proper
di󰀨erential during EconoPhase operation.
• Piping - The condenser piping is larger than what is typically
specied for Liebert®air-cooled Precision Cooling systems.
The pipe sizing still allows oil return to the compressor
and also allows for e󰀩cient operation in both modes of
operation. All eld piped lines must be insulated because the
uid temperatures can be well below the dew point during
EconoPhase operation. All outdoor insulation must be UV
rated and rated for outdoor use.
• Unit/Module Communications - A CANbus connection links
the Liebert PDX and the air-cooled condenser to achieve the
most e󰀩cient operation as well as the condenser and the
Liebert®EconoPhase module.
1.6 - Operating Modes
Each circuit on a system combining a Liebert®EconoPhase,
Liebert DSE and Liebert MC has six distinct operating modes:
• Idling with compressor and pumps O󰀨
• Startup
• Compressor operation
• Compressor-to-pump changeover
• Pump operation
• Pump-to-compressor changeover
A circuit will run most of the time in either compressor or pump
operation mode. These modes both e󰀩ciently remove heat from
the conditioned space and reject it via the air-cooled condenser.
The ow paths during each mode of operation are detailed in
Figures 3 and 4.
A couple of di󰀨erences to note between Compressor Mode and
Liebert®EconoPhase operation:
• The unit does not dehumidify in Liebert®EconoPhase operation.
If dehumidication is desired, Liebert®EconoPhase operation
must be disabled.
• Bubbles may be seen in the site glass in the indoor unit when
the system is in Liebert®EconoPhase operation. This does not
necessarily mean the system is low on charge.

4Liebert®PDX, EconoPhase Version - UM - 265133 - 29.08.2019
Fig.3 - Compressorized operation ow path
Fig.4 - Pump operation ow path
Check Valve
Check Valve
Check
Valve
Compressor
Condenser
Evaporator
Electronic
Expansion
Valve
Solenoid ValvePump
Check Valve
Condenser
Compressor
Check
Valve
Solenoid
Valve
Electronic
Expansion
Valve
Evaporator
Check Valve
Pump