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Liebert® PEX+ Series
Precision Air Conditioning
Technical Manual
Page 2
Copyright by Vertiv Co. Ltd.
The content in this document is subject to change without notice. All rights, including rights
of translation, reproduced by printing, copying or similar methods, and even of parts, are
reserved. Violators will be liable for damages. All rights, including rights deriving from patent
license or registration of a utility model or design, are reserved. No part of this document
may be reproduced or transmitted in any form or by any means without the prior written
consent of Vertiv Co. Ltd.
Notice
The purchased products, services, and features are stipulated by the contract made
between Vertiv Co., and the customer. All or part of the products, services, and features
described in this document may not be within the purchasing scope or the usage scope.
Unless otherwise specified in the contract, all statements, information, and
recommendations in this document are provided "AS IS" without warranties, guarantees or
representations of any kind, either express or implied. The information in this document is
subject to change without notice. Every effort has been made in the preparation of this
document to ensure the accuracy of the contents, but all statements, information, and
recommendations in this document do not constitute a warranty of any kind, express or
implied.
Vertiv Co., Ltd.
• China
Website: www.vertivco.com
E-mail: support@Vertivco.com
Customer service hotline: 4008876510
• Asia Pacific
Homepage: www.vertivco.com.
E-mail: overseas.support@Vertivco.com
For Technical Support, users may contact the nearest Vertiv Co. local sales office or service
centre.
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Purpose of the Document
This document applies to the Liebert PEX+ series of precision air conditioners cooling solutions
which maintain an optimal environmental control mainly for technological ecosystems at
minimal operating costs. This document gives an overview of the technical specification. The
figures used in this document are for reference only. Please read this manual carefully.
Styling used in this Guide
The styles used in the manual will be defined as mentioned in the following table:
Situation Description
Warning/Danger/Caution
The
Warning/Danger/Caution
note indicates a
hazardous or potentially harmful situation that can
result in death or injury. It also indicates instructions
that need to be adhered to, failing which may result
in danger and safety issues thereby having an
adverse effect on the reliabi
lity of the device and
security. Even for practices not related to physical
injury, the content under the Warning heading is
used for precautions which need to be taken which,
otherwise, could result in equipment damage,
performance degradation, or interruption in service.
Note
The
Note
section indicates additional and useful
information. It also calls attention to best practices
and industry-
best protocols that are standardized
and help make maximum utilization of the resources
at hand. Helpful information related to the product
also comes under the Note heading, helping the
users with the definitions, concepts, and
terminologies used in the manual.
Version History
Issue Revision Change
31020862 V1.0
-
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Vertiv I Liebert PEX+ I Technical Manual
TABLE OF CONTENTS
1 Product Overview ................................................................. 3
1.1
Product Introduction ........................................................................................................ 3
1.2 Model Description
......................................................................................................................... 4
2 Components & Features ...................................................... 5
2.1 Components ............................................................................................................................... 5
2.1.1 Compressor ............................................................................................................................................................................. 5
2.1.2 Evaporator ........................................................................................................................................................................................................ 5
2.1.3 Thermal Expansion Valve ...................................................................................................................................................................6
2.1.4 Infrared humidifier .....................................................................................................................................................................................6
2.1.5 EC Fans ................................................................................................................................................................................................................ 7
2.1.6 Electric Heater .............................................................................................................................................................................................. 7
2.1.7 Sight Glass ........................................................................................................................................................................................................ 8
2.1.8 iCOM Controller ........................................................................................................................................................................................... 8
2.1.9 Filter Drier ..........................................................................................................................................................................................................9
2.1.10 Condenser ......................................................................................................................................................................................................9
3 Model Nomenclature .......................................................... 10
4 Operating Parameters ........................................................ 11
4.1 Storage Environment ............................................................................................................ 11
4.2 Operating Environment ....................................................................................................... 11
5 Technical Parameters ......................................................... 12
5.1 Technical Specifications ..................................................................................................... 12
6 iCOM Controller ................................................................... 12
6.1 Features .............................................................................................................................................................................................................. 14
6.2 iCOM Components ................................................................................................................................................................................... 15
6.3 iCOM Display Components & Functions .............................................................................................................................. 16
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7 Mechanical Parameters ...................................................... 18
7.1 Positions and dimensions of air outlet ........................................................................... 18
7.1.1 Base pallet cut-out location dimensions ............................................................................................................................ 18
7.1. 2 Position and dimensions of air outlet on top cover.................................................................................................. 19
7.1. 3 Side panel knock-out locations ................................................................................................................................................. 19
7.2 Plenum dimensions (for Upflow unit) ........................................................................... 20
7.3 Installation Space Requirements .................................................................................... 22
7.4 Maintenance Space requirement ................................................................................... 22
7.5 System Installation Arrangement .................................................................................. 23
7.6 Recommended Pipe sizes ................................................................................................. 24
8 Electrical Parameters ........................................................ 25
8.1 Power Cable Specifications .............................................................................................. 25
9 Optional Components ........................................................ 26
9.1 Electronic Expansion Valve (EEV) .................................................................................. 26
9.2 Electrode humidifier ............................................................................................................ 26
9.3 Extended piping kit ............................................................................................................. 26
9.4 Low temperature kit ........................................................................................................... 27
9.5 Two stage electric heater ................................................................................................. 27
9.6 Up flow Plenum ..................................................................................................................... 27
9.7 High efficiency Filter ........................................................................................................... 27
9.8 Water leakage alarm ........................................................................................................... 27
9.9 Smoke and fire detectors .................................................................................................. 28
9.10 Supply Air Temperature Sensor .................................................................................... 28
9.11 Supply Air Pressure Sensor ............................................................................................. 28
9.12 Remote Sensor .................................................................................................................... 28
9.13 Smoke sensor ....................................................................................................................... 28
9.14 IS - Unity card ...................................................................................................................... 28
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1 Product Overview
1.1 Product Introduction
The Liebert PEX+ series is the next generation series of air conditioners that provide precise
environmental control. The Liebert PEX+ models are the latest in the long line of modern
enterprise-grade products from the Liebert family. Incorporating the high standards
associated with the Liebert name, the PEX+ series utilizes the latest technology, system
components, and streamlined manufacturing process.
Liebert PEX+ air conditioners are products that are specifically created and designed for the
data centers, computer rooms, and similar ecosystems which call for a high degree of accuracy
and precision. It addresses the needs and challenges associated with such applications and
setups. It caters to sensitive applications which need a suitable environment for optimal
performance. Therefore, care should be taken while testing these sensitive products or
maintaining a favorable environment for mission critical equipment, as even a slight deviation
may lead to inaccurate results. Precision Air Conditioning must not only keep room conditions
within a specific range but also must have the precision to react quickly to a drastic change in
heat load and prevent wide temperature fluctuations.
The PEX+ air cooled AC unit is packed with features such as high reliability, high sensible heat
ratio, and large airflow. It is an excellent system that adheres to the standards in Precision Air
Cooling in terms of energy-efficiency, space requirements, and reliability.
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1.2 Model Description
The Liebert PEX+ appearance is shown in Figure 1-1.
Figure 1-1 PEX+ Model
Figure 1-2 Main Components
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2 Components & Features
This section gives an overview of the main components and its features in the PEX+ series of
air conditioners.
2.1 Components
2.1.1 Compressor
The Liebert PEX+ series models comprise of a Copeland scroll compressor which has a host of
promising features such as low operating noise, less vibration, and high reliability. The
Rotalock (screw thread) connection mode makes the maintenance easier. Its compactness,
smooth compression with scroll operation and high energy efficiency ratio make it an ideal
compressor to bank on for the PEX+ series.
Figure 2-1 Compressor
2.1.2 Evaporator
The evaporator consists of a V-coil (for up flow)/A-coil (for down flow) incorporating draw-
through air design for uniform air distribution. The coil
is constructed of enhanced surface
aluminum fins mechanically bonded to enhanced surface copper tubes.
The coil frame is
fabricated from hot dipped galvanized sheet metal and the stainless-steel condensate drip
tray. Hydrophilic coating on cooling coil enhances longevity.
The sophisticated design of the distributor ensures that the refrigerant is distributed evenly in
each loop, thereby improving the effectiveness of the heat exchanger.
Figure 2-2 Evaporator
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2.1.3 Thermal Expansion Valve
The thermal expansion valve with external equalizer can automatically regulate refrigerant
flow according to the operation condition of the refrigeration system to optimize the
performance of the unit in the change of indoor and outdoor temperature.
Figure 2-3 Thermal Expansion Valve
2.1.4 Infrared humidifier
The infrared humidifier consists of infrared humidifier lamp, water injection valve, humidifying
water dish, temperature alarm protection devices and water level alarm device.
The infrared humidifier in the Liebert PEX+ series provides quicker and more responsive
operation which is quite important for mission-critical applications. These humidifiers reduce
the dependency of water quality and simultaneously achieve full capacity in quick time using
almost any water quality.
Figure 2-4 Infrared Humidifier
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2.1.5 EC Fans
The EC Fans used in the Liebert PEX+ models are energy-efficient and innovative with
integrated electronics and a maintenance-free design.
• Ability to regulate the airflow and reduce the fan input power leading to high energy-
efficiency.
• Easy-to-connect facility with minimum wiring leading to a high performance with a
great variety of possible air flow rates.
Figure 2-5 EC Fans
2.1.6 Electric Heater
In the PEX+ models, the PTC heaters are used as they have lower running temperatures,
thereby ensuring operational safety.
• Less susceptible to overheating and long lasting due to less wear
• Lower Maintenance and Smooth operation
Figure 2-6 Electric Heater
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2.1.7 Sight Glass
The sight glass is a utility for observing the refrigerant state; specifically, the moisture content
of the system. If the moisture content exceeds the levels of defined standards the color
changes, thereby, indicating irregularity in the moisture content.
Figure 2-7 Sight Glass
2.1.8 iCOM Controller
The iCOM Controller used in PEX+ provides a simple operational user-interface and is
developed using the latest and highly advanced
PID regulation technology.
Liebert iCOM’s menu-driven display is used for all programming functions on each connected
cooling unit. The Status menu displays the status of the conditioned space, such as room
temperature and humidity, temperature and humidity setpoints, alarm status and settings,
event histories and the current time.
Figure 2-8 iCOM Controller
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2.1.9 Filter Drier
Moisture can have an adverse effect on the operation and life of a system in the refrigeration
cycle.
To counter that effect, Filter-driers are used to filter out particles and remove and hold
moisture to prevent it from circulating through the system. The Liebert PEX+ AC consists of
nylon filter material with big mesh. The filter features compact structure and easy
maintenance. It can be washed repeatedly.
Figure 2-9 Filter Drier
2.1.10 Condenser
The Liebert range of air conditioners offers many advantages, some of which are listed below:
• Antirust aluminum cabinets
• Low sound levels
• High reliability over a wide range of ambient conditions
Figure 2-10 Condenser
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3 Model Nomenclature
The model of the PEX+ series AC is fully-defined by twenty-five digits, as shown in Figure 3-1.
1
2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25
P 1 0 5 0 D A 1 3 S H S 1 2 S 1 D 0 0 0 C E 0 L 0
Digit 1 Product model Digit 16 Enclosure options
P PEX+ 1 Standard Color black orange peel grain coating
Digit 2 Product model 2 White orange peel grain coating
1-2
Number of Modules/Bays
6 Color Charcoal grey
Digit 3 Cooling Capacity kW
Digit 17 Mains Switch High Voltage Option
0-9 Nominal Net Cooling Capacity - kW D Main non-Locking Disconnect
Digit 4 Cooling Capacity kW P Dual Power Supply Parallel
0-9 Nominal Net Cooling Capacity - kW A Dual Power Supply Auto Alternate(Interlocking contactor)
Digit 5 Cooling Capacity kW T Dual Power Supply Auto Alternate(ATS)
0-9 Nominal Net Cooling Capacity - kW Digit 18 Lock Out Low Voltage Option
Digit 6 Air Discharge 0 None
U Upflow H Reheat & Humidity Lockout
D Downflow Digit 19 Monitoring
Digit 7 System type 0 No Card
A Air cooled 7 Unity card
W Water cooled 8
Unity card*2
D Dual Cool-Chilled water+Air cooled Digit 20 Sensors
H
Dual Cool-Chilled water+Water cooled
0 None
Digit 8 Airflow S Smoke Sensor
1 EC plug fan-Standard Static H High Temperature
Digit 9 Power Supply F Smoke & High Temp
3 380-415V / 3ph / 50Hz+N R Remote sensor
T 380V / 3ph / 60Hz+N N Supply Air Temperature Sensor
Digit 10 Cooling System A Supply air pressure sensor
C Compliant Scroll Single Circuit, R407C X Other sensors
S Compliant Scroll Dual Circuit, R407C Digit 21 Packaging
E Digital Scroll Single Circuit, R407C P Packaging - Standard Cardboard and Wooden Pallet
D Digital Scroll Dual Circuit, R407C C Packaging - Wooden crate
4 Compliant Scroll Single Circuit, R410A
Digit 22 Special Requirements
6 Compliant Scroll Dual Circuit, R410A E For Export
7 Digital Scroll Single Circuit, R410A Digit 23 Order Identifier
T Digital Scroll Dual Circuit, R410A 0 Standard Static
Digit 11 Humidification 1 High ESP 100 Pa
0 None 2 High ESP 200 Pa
H
Infrared Humidifier
3 High Airflow/ESP other
S Electrode humidifier X SFA Included
Digit 12 Display Digit 24 Order Identifier
S Standard Display 0 None
L Large Display L Air cooled-long piping>30m
Digit 13 Re-Heating C Low temp Kits
0 None B Low temp Kits+Long piping
1 Electric heating Std 1 Stage X SFA Included
2 Electric heating Opt. 2 Stage Digit 25 Order Identifier
Digit 14 Filtration 0 None
2 G4 X SFA Included
3 F5
Digit 15 Coil and Valves
S Standard DX Air cooled coil，TXV
E Standard DX Air cooled c oil，EEV
Figure 3- 1 Nomenclature
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4 Operating Parameters
Refer the following tables 4.1 and 4.2 for the Storage Environment and Operating Environment.
4.1 Storage Environment
Tab l e 4 . 1 Storage environment requirements
Item Requirement
General requirements Indoor, clean, no dust
Ambient humidity 5%RH to 85%RH (non-condensing)
Ambient temperature -20℃ to +54°C
Storage time Total transportation and storage time should not exceed six
months. Otherwise, the performance needs to be recalibrated
4.2 Operating Environment
The operating environment of the Liebert PEX+ meets the requirements of GB4798.3-2007.
Refer the Table in 4.2 for details.
Table 4. 2 Operating environment requirement
Item Requirement
Ambient temperature
Indoor 18°C ~ 32°C
Outdoor Air-cooled: -35°C～+45°C (Low-temp. kit is
required when the temperature is below -15°C)
Protection level (indoor unit) IP20
Altitude <1000m. Above that, derating is required
Operation voltage range 380V (-10% ~ +15%), 3N~ 50Hz
When the unit is used in the following condition, Contact Vertiv Co.
• If the unit voltage exceeds the operating voltage range.
• Derating for altitude above 1000m.
• Other applications outside of applicable scopes.
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5 Technical Parameters
5.1 Technical Specifications
The technical specification of PEX+ Downflow and Upflow Air cooled unit with Fixed Scroll
Compressor is mentioned in table 5.1.
Table 5.1
• Performance tolerance is 5%
• For net capacities, deduct fan input power. Refer to the Liebert PEX+ Rating for
specific input conditions, air flow, and configuration
• *1: The above cooling capacity is based on condensing temperature of 45°C
• *2: For downflow unit ESP 20 Pa & for upflow unit ESP50Pa considered
• *3: Fixed Scroll compressor with R407C based refrigerant
• Standard offer is with TXV, EEV is available on request
• Water cooled condenser can be offered on request
Model P1020 P1025 P1030 P1035 P1040 P1050 P2060 P2070 P2080 P2090 P2100
Gross Cooling capacity and Sensible cooling capacity (kW)
Cooling
capacity*¹
(24 ºC DB
50%RH)
22.3 31.1 37.1 41.4 45.9 54.5 74.4 77.9 91.3 102.1 109.0
Sensible
cooling
capacity
(24ºC DB
50%RH)
19.4 26.9 32.4 35.9 40.1 48 64.9 68.7 80 89.6 95.8
Indoor unit Fan section
Std. Air
volume
(m³/hr)
5500 6700 8000 9000 10600 12200 16000 18000 21200 24400 24400
Fan
number
1 1 1 1 1 1 2 2 2 2 2
Fan power
(kW)*²
Downflow
0.64 1.02 1.47 1.83 1.51 1.86 2.94 3.65 3 3.72 3.72
Fan power
(kW)*² -
Upflow
0.72 1.12 1.57 1.94 1.77 2.22 3.15 3.87 3.55 4.43 4.43
Compressor*³
Number 1 1 1 1 1 1 2 2 2 2 2
PTC type Electric heater
Power
(kW)
6 6 6 6 9 9 9 9 12 12 12
Infrared humidifier
Humidifyin
g capacity
(kg/h)
4.5 4.5 4.5 4.5 4.5 4.5 10 10 10 10 10
Unit Footprint
Unit
dimension
(W*D*H)
(mm)
853X874 X 1970 1130 X 995 X 1975 1330 X 995
X 1975
1830 X 995
X 1975
2230 X 995 X 1975
Indoor Unit Weight
Net weight
(kg)
320 340 400 420 460 530 690 730 770 805 810
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The technical specification of PEX+ Downflow and Upflow Air cooled unit with Digital Scroll
Compressor is mentioned in table 5.2
Table 5.2
• Performance tolerance 5%
• For net capacities, deduct fan input power. Refer to the Liebert PEX+ Rating
for specific input conditions, air flow, and configuration.
• *1: The above cooling capacity is based on condensing temperature of 45°C
• *2: For downflow unit ESP 20Pa & for upflow unit ESP 50Pa considered
• *3: Digital Scroll compressor equipped with R407C refrigerant
• Standard offer is with TXV, EEV is available on request
• Water cooled condenser can be offered on request
Model P1020 P1025 P1030 P1040 P1050 P2060
Gross Cooling capacity and Sensible cooling capacity (kW)
Cooling capacity*¹
(24
∘
C DB
50%RH)
22.6 25.5 33.7 45.7 50.1 66.0
Sensible cooling
capacity (24
∘
C
DB 50%RH)
19.5 23.4 29.3 39.4 44.2 58.0
Indoor unit Fan section
Std. Air volume
(m³/hr)
5500 6700 8000 10600 12200 16000
Fan number 1 1 1 1 1 2
Fan power (kW)*²
- Downflow
0.6 1.0 1.5 1.5 1.9 2.9
Fan power (kW)*²
- Upflow
0.7 1.1 1.6 1.8 2.2 3.1
Compressor*³
Number 1 1 1 2 2 2
PTC type Electric heater
Power (kW) 6 6 6 9 9 9
Infrared humidifier
Humidifying
capacity (kg/h)
4.5 4.5 4.5 4.5 4.5 10
Unit Footprint
Unit dimension
(W*D*H) (mm)
853 X 874 X 1970 1130 X 995
X 1975
1330 X 995
X 1975
1830 X 995
X 1975
Indoor Unit Weight
Net weight (kg) 320 340 440 460 530 690
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6 iCOM Controller
The Liebert iCOM offers the highest capabilities in unit control, communication and
monitoring of Liebert mission-critical cooling units.
Liebert iCOM may be used to combine multiple cooling units into a team that operates as a
single entity, enhancing the already-high performance and efficiency of Liebert’s units.
Large graphic display wall-mount versions of the control are available for remote operation
and monitoring of cooling units.
6.1 Features
Large and Small Displays
The Liebert iCOM is available with either a large or small liquid crystal display.
• The Liebert iCOM with small display has a 128 x 64 dot matrix screen that
simultaneously shows two menu icons, along with descriptive text.
• The Liebert iCOM with large display has a 320 x 240 dot matrix screen that shows up
to 16 menu icons at a time, as well as descriptive text. This display may be used to
control a single cooling unit or any cooling unit on a network, regardless of how it is
connected - either integrated into a cooling unit or simply connected to the network
and mounted remotely.
Liebert iCOM’s menu-driven display is used for all programming functions on each
connected cooling unit. The Status menu shows the status of the conditioned space, such as
room temperature and humidity, temperature and humidity setpoints, alarm status and
settings, event histories and the current time.
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6.2 iCOM Components
Figure 6- 1 Wall Mount Large Display Figure 6 - 2 Direct Panel Mount Large Display
and Bezel
Figure 6 - 3 Direct Panel Mount Small Figure 6 - 4 Liebert iCOM Display and Bezel
Input/Output Board
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6.3 iCOM Display Components & Functions
The small and the large display have a common key layout, as depicted in the figure 6-5
Figure 6-5 Liebert iCOM components
• The Help key may be pressed at any time for a brief explanation of what is being
viewed.
• The risk of inadvertent system shutdown can cause loss of cooling and equipment
damage.
• Press the On/Off key on a Liebert iCOM large display while the system screen is
shown permits shutting down all units on the network.
• Large Liebert iCOM displays can view and control other units on the network when
they are in the same group. When turning a unit Off or On with the large display,
make sure that the unit to be shut down or started up is shown on the screen. If the
system screen is shown and the On/Off key is pressed, the Liebert iCOM shows a
notification that pressing the On/Off key again will turn Off all units on the network.
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6.3.1 Keyboard icons and functions
The following table 6.1 depicts the keyboard icons and functions
Tab l e 6.1
Icon
Key Name Function
On/Off Key Begins Shutdown or Startup
Alarm Key Silences/Resets an alarm
Help Key Accesses integrated help menus
Escape Key Returns to the previous display view
Enter Key Confirms all selections and selects icons or text
Increase Key
(Up Arrow)
Moves upward in a menu or increases the value of a selected
parameter
Decrease
Key (Down
Arrow)
Moves downward in a menu or reduces the value of a selected
parameter
Left and
Right Arrow
Keys
Navigates through text and sections of the display
Upper LED
Blinking Red—Active, unacknowledged alarm exists
Solid Red—Active, acknowledged alarm exists
Lower LED
Amber—Power is available to the unit, unit is NOT operating
Green—Power is available to the unit, unit is operating
Lower LED
Green and Amber LEDs will flash alternately when the unit is in
Standby
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7 Mechanical Parameters
7.1 Positions and dimensions of air outlet
7.1.1 Base pallet cut-out location dimensions
The cutout position and dimensions are shown in Figure 7-1.
Top View of cut-out location dimensions of at the base of P1020 and P1025 unit (unit: mm)
Front View of 1130mm/1830mm unit cut-out location
Front View of 1330mm/2230mm unit cut-out location
P: Power cable entry D: Water drain hole
H: Water inlet for humidifier C/R: Condenser water inlet and outlet /refrigerant inlet and outlet
Figure 7-1 Cut-out location dimensions of at the base of P1030-P2100unit (unit: mm)
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7.1.2 Position and dimensions of air outlet on top cover
The position and dimensions of air outlet on the top cover of Upflow unit are shown in figure 72 and in Table 7.1 respectively.
Figure 7-2 Position of air outlet on top cover of Upflow unit
Tab l e 7. 1 Dimensions of air outlet on top cover of Upflow unit (unit: mm)
Model A B
C
P1020 to P1025
720
795
800
P1030 to P1035 650 900 700
P1040 to P1050 850 900 900
P2060 to P2070 650 900 1400
P2080 to P2100 850 900 1800
7.1.3 Side panel knock-out locations
If piping and wiring from the base are difficult, the connection from side panel can be selected.
The locations and dimensions of knock-out holes are shown in Figure 7-3 and 7-4. Select the
inlet and outlet holes according to the actual needs. Ensure only one service is used per
opening.
Figure 7-3 P1020 and P1025 series knock-out
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P1030-2100 series knock-out
Figure 7-4 Knock-out holes of side panel (unit: mm)
The equipment has knock-outs, be sure to mount sleeve to the cable holes to avoid
cutting the cables.
7.2 Plenum dimensions (for Upflow unit)
For Upflow system, the plenums with grilles can be selected by requirements.
Figure 7-5 Plenum dimensions of P1020 and P1025 upflow unit
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Figure 7-6 Plenum dimensions of P1030
～
P1050 upflow unit
Figure 7-7 Plenum dimensions of P2060
～
P2100upflow unit
The dimensions of plenum are depicted in Table 7.2
Tab l e 7. 2
Model D (Depth) W (Width) H (Height)
P1020 to P1025 857 863 400(600, optional)
P1030 to P1035 995 1130 400(600, optional)
P1040 to P1050 995 1330 400(600, optional)
P2060 to P2070 995 1830 400(600, optional)
P2080 to P2100 995 2230 400(600, optional)
If the height of the plenum selected for air conditioner unit exceeds 600mm, consult
Vertiv Co. professional for non-standard production.
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7.3 Installation Space Requirements
Adequate installation space for the indoor unit must be provided. The indoor unit of the aircooled product must be installed on the floor of an equipment room or computer room, and
the condenser can be installed on the ground of outdoor or other room. The entire water
cooled precision AC shall be installed on the floor of an equipment room or computer room.
• Do not use the indoor unit in the open and severe outdoor environment.
• Avoid locating the indoor unit in concave or narrow areas, which can baffle
the airflow, shorten the cooling cycle and result in air return short circuit and
air noise.
• Avoid locating multiple indoor units close to each other. That can result in
crossing air patterns, unbalanced load and competitive operation.
• Do not install the unit near any precision equipment, and prevent the leaked
condensation water due to improper use of the air conditioner from affecting
the operation of precision equipment.
• Do not install any other devices (such as smoke detector) over the cabinet.
7.4 Maintenance Space requirement
Make sure to reserve the maintenance space when installing the equipment. A maintenance
space of 900mm must be allocated in front of the air conditioner unit normally. The
requirement for maintenance space is given in Figure 7-8.
Figure 7-8 Maintenance space of unit
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7.5 System Installation Arrangement
The piping for the refrigerant is required for the indoor unit and outdoor unit of the air-cooled
system. The general arrangement diagram of the refrigeration system is shown in Figure 7-9.
Scroll compressor
Service valve
Suction pipe
Discharge pipe
Ball valve
Thermal sensing bulb
Evaporator coil
Thermal expansion valve
Sight glass
Dry filter
Solenoid
valve
+
HP switch
Needle valve
LP sensor
Condenser coil
Check valve
Oil trap
*
(mounted one for every
rise of 7.5m)
distributor
Figure 7-9 Maintenance space of unit
• : Factory piping
• : Field piping (by technical personnel)
The following points should be considered before checking out the overall layout
diagram:
• The single system is used as an example to describe the entire system.
• Vertiv Co. staff and qualified professionals lay out the piping.
• Components (marked with *) are not supplied by Vertiv Co. but are recommended for
proper circuit operation and maintenance.
• Additional components (marked with +) are required when the equivalent length exceeds
30m.
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7.6 Recommended Pipe sizes
The table 7.3 depicts the recommended standard and extended pipe sizes of the single and
dual system.
Table 7. 3
Recommended pipe sizes (unit: mm)
Model
P1020
single system
P1025
single system
P1030
single system
P1035
single system
P1040
single system
P1040
dual system
Pipe
length
D L D L D L D L D L D L
10m 22 13 22 13 22 16 22 16 22 16 22 13
20m
22
13
22
13
22
16
22
16
22
16
22
13
30m 22 13 22 13 25 16 25 16 25 19 22 13
40m*
22
16
22
16
25
19
25
19
25
19
22
16
50m* 22 16 22 16 25 19 28 19 28 19 22 16
60m*
22
16
22
16
25
19
28
19
28
19
22
16
Model
P1050
dual system
P2060
dual system
P2070
dual system
P2080
dual system
P2090
dual system
P1050 single
system &
P2100 dual
system
Pipe
length
D L D L D L D L D L D L
10m
22
13
22
16
22
16
22
16
22
16
22
16
20m 22 13 22 16 22 16 22 16 22 16 25 16
30m
22
16
25
16
25
16
25
19
25
19
28
19
40m* 22 16 25 19 25 19 25 19 28 19 28 19
50m*
22
16
25
19
28
19
28
19
28
19
28
19
60m* 22 16 25 19 28 19 28 19 32 19 32 19
Note:
1. Extension kit should be added to the “Eq. Length” marked with *.
2. D: discharge line, L: liquid line.
3. Consult Vertiv Co. If the line length exceeds 60m.
4. If the outdoor temperature of the unit is below -20℃, the low-temperature kit must be used, and please
consult Vertiv Co. for details.
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Vertiv I Liebert PEX+ I Technical Manual
8 Electrical Parameters
8.1 Power Cable Specifications
The power cable size and rated full load ampere (FLA) is depicted in the table 8.1.
Table 8.1 Rated full load ampere (FLA) (unit: A)
Model
Standard
model
With heating Without heating
Standard
model with
2-stage
electric
heating
1-stage
electric
heating/ No
humidifying
2-stage
electric
heating/ No
humidifying
Humidifyi
ng
No
humidifying
P1020U(D)A13C 25.7 34.8 25.7 34.8 22.7 16.6
P1025U(D)A13C 30.9 40.0 30.9 40.0 27.9 21.8
P1030U(D)A13C 32.8 41.9 32.8 41.9 29.8 23.7
P1035U(D)A13C 35.7 44.8 35.7 44.8 32.7 26.6
P1040U(D)A13C 43.2 56.8 43.2 56.8 35.6 29.5
P1040U(D)A13S
42,4
56.0
42,4
56,0
34,8
28,7
P1050U(D)A13C
48.0
61.6
48.0
61.8
40.4
34.3
P1050U(D)A13S
51.0
64.6
51.0
64.6
43.4
37.3
P2060U(D)A13S 61.0 74.7 61.0 74.7 58.8 47.4
P2070U(D)A13S 64.0 77.7 64.0 77.7 61.8 50.4
P2080U(D)A13S 77.2 95.4 77.2 95.4 70.4 59.0
P2090U(D)A13S 82.2 100.4 82.2 100.4 75.4 64.0
P2100U(D)A13S 87.2 105.4 87.2 105.4 80.4 69.0
Note:
1. The standard model is configured with humidifier and 1-stage electric heating.
2. Air-cooled unit FLA excludes the condenser current.
3. MCB and incoming cable sizes will be selected as per local electrical guidelines.
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9 Optional Components
9.1 Electronic Expansion Valve (EEV)
The EEV is designed for modulating control of the refrigerant mass flow with precision. The
EEV collects temperature and pressure signals at the same time to accurately regulate the
refrigerant flow. The EEV's wide operating envelope also lowers down the condensing
pressure, thereby resulting in significant energy savings.
• Designed for modulating control of the refrigerant mass flow with precision
• Ensures effective control on super-heating at the end of the evaporator
• Better low load capacity
• Designed for easy Installation-and-Service
Figure 9-1 Electronic Expansion Valve
9.2 Electrode humidifier
The electrode humidifier uses the electrodes to boil the water in humidifier tank to produce
steam for humidifying purpose. It has a different requirement for water quality and sizes of
inlet/outlet pipes with respect to the standard infrared humidifier.
Figure 9-2 Electrode Humidifier
9.3 Extended piping kit
If there is a requirement for long distance piping / high vertical rise between the indoor unit
and condenser according to actual application condition, an extension kit (which includes
solenoid and check valve) will be configured and the specific selection of pipes is done as per
the values described in
Table 7. 3.
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9.4 Low temperature kit
To ensure the air conditioner can start normally in areas where the outdoor temperature is low,
a low-temp kit is configured to effectively provide low voltage as required at the startup of the
unit. This is done to avoid startup failure of the unit caused by low pressure.
9.5 Two stage electric heater
The two-stage heater can be selected according to the heating requirement. The electric
heater can be divided into two stages by configuring the controller. The heater starts up step-
wise according to the heating requirement. It not only maintains the room temperature but
also reduces the energy consumption.
Figure 9-3 Electric Heater (Two stage)
9.6 Up flow Plenum
A plenum of the same size as the unit can be selected for Upflow system. All plenums have
grilles at the outlet to streamline the air flow moving across the room. The plenum grills can be
regulated manually by changing the direction of airflow as per the site requirement. Refer the
Table 7. 2 for Plenum dimensions.
9.7 High efficiency Filter
The filtration efficiency level F5 (EN 799) and the average filtration efficiency of up to 90%
(ASHRAE52.1-1992) which restricts dust particles inside the cabinet.
9.8 Water leakage alarm
The water leak detector cable or point leak detector can provide input to the units or a third
party stand-alone monitoring system with an analog alarm signal to trigger a water leak
detection alarm of air conditioner unit and stop the water supply to the humidifier. The water
leakage alarm can accurately show the location of water leakage.
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9.9 Smoke and fire detectors
The smoke detector can trigger the alarm system at once and turn off the unit when smoke is
detected. The fire detector can monitor the field return air temperature. Once it detects high
temperature, it will cut off the air return to the air conditioner unit at once. Both detectors are
indispensable to some data centers which cater to critical applications.
9.10 Supply Air Temperature Sensor
The unit needs to control supply air temperature when the data rooms have the racks arrange
in cold/hot aisle configuration. The sensor which is installed at the inlet of the fan for the
down-flow unit needs to be moved to the outlet of the fan.
9.11 Supply Air Pressure Sensor
Supply Air Pressure Sensor is used only for down-flow units. It detects the static pressure
under the floor of data room. The controller can adjust the fan speed according to the value
detected to get a constant desired static pressure reading.
9.12 Remote Sensor
The outlet of AC and the rack have a mere difference in the temperature. If the server inlet
temperature is to be controlled precisely, the remote temperature sensor which is mounted in
the cold aisle on the rack must be preferred.
9.13 Smoke sensor
The smoke sensor is installed in the unit return air side, for detecting smoke thereby,
generating a smoke detection alarm.
9.14 IS - Unity card
IS-UNITY Card can provide two kinds communication protocol: IS-485 and IS-WEB adopting
the communication and protocol of industry information department.
Figure 9-4 IS Unity Card
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