Emerson Liebert PEX+ Series User manual

Liebert. PEX+ Series Precision Air Conditioner
User Manual
Version
Revision date
BOM
V1.1
2015-01-06
31013096
Emerson Network Power provides customers with technical support. Users may contact the nearest
Emerson local sales office or service center.
Copyright © 2015 by Emerson Network Power Co., Ltd.
All rights reserved. The contents in this document are subject to change without notice.
Emerson Network Power Co., Ltd.
Address: Block B2 Nanshan I Park, No.1001 Xueyuan Road, Nanshan District, Shenzhen, 518055
China
Homepage: www.emersonnetworkpower.com.cn
Customer service hotline: [phone]
E-mail: [e-mail]

Contents
Chapter 1 Overview..................................................................................................................................................... 1
1.1 Model Description.......................................................................................................................................... 1
1.2 Appearance................................................................................................................................................... 2
1.3 Main Components and Optional Features....................................................................................................... 2
1.3.1 Components of Indoor Unit.................................................................................................................. 2
1.3.2 Condenser.......................................................................................................................................... 3
1.3.3 Remote Monitoring Software ............................................................................................................... 3
1.3.4 Optional Features................................................................................................................................ 3
1.4 Storage Environment ..................................................................................................................................... 3
Chapter 2 Instructions for Installation Preparations....................................................................................................... 4
2.1 Equipment Room Requirement....................................................................................................................... 4
2.2 Installation Space .......................................................................................................................................... 4
2.2.1 Installation Space Requirements.......................................................................................................... 4
2.2.2 Maintenance Space requirement ......................................................................................................... 4
2.3 Operating Environment .................................................................................................................................. 5
2.4 Unpacking And Inspection.............................................................................................................................. 5
2.4.1 Transportation And Movement............................................................................................................. 5
2.4.2 Unpacking........................................................................................................................................... 6
2.4.3 Inspection........................................................................................................................................... 7
Chapter 3 Mechanical Installation................................................................................................................................. 8
3.1 Installation Notes........................................................................................................................................... 8
3.2 System Installation Arrangement.................................................................................................................... 8
3.2.1 Overall System Arrangement............................................................................................................... 8
3.2.2 System Installation Illustration.............................................................................................................. 9
3.3 Mechanical Parameters.................................................................................................................................. 9
3.3.1 Dimensions and weight of indoor unit................................................................................................... 9
3.3.2 Dimensions and weight of condenser..................................................................................................10
3.3.3 Plenum dimensions (for upflow unit) ...................................................................................................10
3.3.4 Positions and dimensions of air outlet.................................................................................................11
3.4 Installing Indoor Unit .....................................................................................................................................13
3.4.1 Making base......................................................................................................................................13
3.4.2 Installing base....................................................................................................................................13
3.4.3 Vibration absorbing............................................................................................................................13
3.4.4 Install Indoor Unit Cabinet ..................................................................................................................14
3.5 Installing Condenser .....................................................................................................................................14
3.6 Piping For Air-Cooled Unit.............................................................................................................................14
3.6.1 Pipe Extension Kit (Optional)..............................................................................................................14
3.6.2 Connecting condensate drain pipe of indoor unit.................................................................................14
3.6.3 Connecting water inlet pipe of humidifier.............................................................................................15
3.6.4 Connecting copper pipes (discharge pipe and liquid pipe) between indoor unit and condenser .............16
3.6.5 Installing pipe extension kit (optional, for site installation).....................................................................17

3.7 Lowering Fan (For Down Flow Unit)...............................................................................................................17
3.8 Removing Fastener And Vibration Absorber ..................................................................................................19
3.9 Installation Inspection....................................................................................................................................20
Chapter 4 Electrical Installation...................................................................................................................................21
4.1 Installation Notes..........................................................................................................................................21
4.2 Wiring Of Indoor Unit.....................................................................................................................................21
4.2.1 Locating Electrical Ports Of Indoor Unit...............................................................................................21
4.2.2 Connecting Power Cable Of Indoor Unit..............................................................................................21
4.2.3 Connecting Control Cables.................................................................................................................22
4.2.4 Connecting Solenoid Valve Of Pipe Extension Kit (Options, For Site Installation)..................................23
4.3 Wiring Of Condenser.....................................................................................................................................24
4.3.1 Connecting Control Signal Terminals..................................................................................................24
4.3.2 Connecting Control Signal Cables ......................................................................................................24
4.4 Installation Inspection....................................................................................................................................24
Chapter 5 iCOM Controller..........................................................................................................................................25
5.1 Appearance..................................................................................................................................................25
5.2 Button And Indicator Panel............................................................................................................................25
5.3 Structure Chart Of Control Menu ...................................................................................................................27
5.4 Startup Interface...........................................................................................................................................27
5.5 Main Interface...............................................................................................................................................27
5.6 USER MENUS..............................................................................................................................................28
5.6.2 PASSWORD......................................................................................................................................28
5.6.3 SET POINTS .....................................................................................................................................28
5.6.4 EVENT LOG......................................................................................................................................29
5.6.5 GRAPHICS........................................................................................................................................29
5.6.6 SET ALARMS....................................................................................................................................30
5.6.7 SENSOR DATA.................................................................................................................................31
5.6.8 DISPLAY SETUP...............................................................................................................................32
5.6.9 TOTAL RUN HRS..............................................................................................................................32
5.6.10 SLEEP MODE..................................................................................................................................33
5.6.11 SERVICE INFO................................................................................................................................33
5.6.12 ACTIVE ALARMS ............................................................................................................................33
5.7 SERVICE MENUS........................................................................................................................................34
5.7.1 PASSWORD LEVEL..........................................................................................................................34
5.7.2 SET POINTS .....................................................................................................................................34
5.7.3 STANDBY..........................................................................................................................................36
5.7.4 WELLNESS.......................................................................................................................................36
5.7.5 DIAGNOSTICS..................................................................................................................................39
5.7.6 SET ALARMS....................................................................................................................................41
5.7.7 CALIBRATION...................................................................................................................................43
5.7.8 NETWORK SETUP............................................................................................................................44
5.7.9 OPTIONS SETUP..............................................................................................................................45
5.7.10 SERVICE INFO................................................................................................................................45
5.8 ADVANCED MENUS....................................................................................................................................46
5.8.1 PASSWORD LEVEL..........................................................................................................................46

5.8.2 FACTORY SETUP.............................................................................................................................46
5.9 MBV Settings................................................................................................................................................50
5.10 EVENT NAME AND DEFINITION................................................................................................................51
Chapter 6 Application Of INTELLISLOT.......................................................................................................................55
6.1 Introduction Of Host Communication Cards ...................................................................................................55
6.2 Installation Of Host Communication Cards.....................................................................................................55
6.3 Commission Of Host Communication Component..........................................................................................56
6.3.1 Setting HyperTerminal........................................................................................................................56
6.3.2 Setting 485 Communication Card .......................................................................................................57
6.3.3 Setting TCP/IP Communication Card..................................................................................................59
6.3.4 Setting SNMP Parameters Of TCP/IP Communication Card................................................................60
6.4 Host Communication Networking Diagram.....................................................................................................63
Chapter 7 System Operation And Maintenance ...........................................................................................................65
7.1 Monthly Routine Inspection Items..................................................................................................................65
7.2 Routine Inspection Items (Half A Year) ..........................................................................................................65
7.3 Self-diagnosis Function.................................................................................................................................66
7.4 Electrical Connection Inspection....................................................................................................................66
7.5 Control Component Appearance Inspection...................................................................................................66
7.6 Air Cooled Condenser...................................................................................................................................67
7.7 Filter.............................................................................................................................................................67
7.8 Infrared Humidifier ........................................................................................................................................68
7.9 Electric Heater..............................................................................................................................................68
Chapter 8 Troubleshooting..........................................................................................................................................69
8.1 Fan Troubleshooting.....................................................................................................................................69
8.2 Compressor And Cooling System Troubleshooting.........................................................................................70
8.3 Infrared Humidifier Troubleshooting...............................................................................................................72
8.4 Heating System Troubleshooting...................................................................................................................72
Appendix 1 Circuit Diagram.........................................................................................................................................75
Appendix 2 Menu Structure Of iCOM Controller (USERS MENUS)...............................................................................77
Appendix 3 Menu Structure Of iCOM Controller (SERVICE MENUS) ...........................................................................79
Appendix 4 Alarm Control Menu Table........................................................................................................................81
Appendix 5 Hazardous Substances or Elements Announcement..................................................................................82
Appendix 6 Monthly Routine Inspection Items..............................................................................................................83
Appendix 7 Routine Inspection Items (Half A Year)......................................................................................................84

Foreword
Liebert.PEX+ series product is the precision air conditioner used in data center, which
is developed based on the Global R&D Platform of Emerson Network Power Co.,
Ltd.(“Emerson” for short hereafter)
This manual focuses on the using instructions, including instructions for installation
preparations, mechanical installation, electrical installation, controller operation,
system operation and maintenance, and troubleshooting, etc. The system operation and
maintenance, trouble-shooting and handling are only limited to user’s independent
maintenance. For the maintenance and troubleshooting works not mentioned in this
manual, please contact Emerson professional engineer. The commissioning and startup
will be conducted by Emerson engineer, so this part is not described in this manual.
Please read this manual carefully before installing, maintaining and troubleshooting,
especially the warning information in the manual.

Chapter1 Overview 1
Liebert. PEX+Series Precision Air Conditioner User Manual
Chapter 1 Overview
The Liebert.PEX+ series precision air conditioner (“Liebert.PEX+” for short hereafter) is professional equipment, which
should not be accessible to the general public. The Liebert.PEX+ is a medium-large size precision environment control
system, suitable for the environment control of the equipment room or computer room, featuring high reliability, high
sensible heat ratio and large air flow. This chapter introduces the model description, appearance, main components
and optional parts.
1.1 Model Description
The model description of Liebert.PEX+ is shown in Figure 1-1.
Figure 1-1 Model description
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 E 1 D 0 0 0 P A 0 0 0
Digit1 Product model N Dual Cool Coil,BPHE-2way,CW-3 way,TXV
PPEX+ P Dual Cool Coil,BPHE-3way,CW-2 way,TXV
Digit2 Product model Digit16 Enclosure options
1-2
Number of Modules/Bays
1 Standard Color black orange peel grain coating
Digit3 Cooling Capacity kW 2 White orange peel grain coating
0-9
Nominal Net Cooling Capacity - kW
6 Color Charcoal grey w/Double skin
Digit4 Cooling Capacity kW Digit17 Mains Switch High Voltage Option
0-9
Nominal Net Cooling Capacity - kW
0 None
Digit5 Cooling Capacity kW D Main non-Locking Disconnect
0-9
Nominal Net Cooling Capacity - kW
P Dual Power Supply Parallel
Digit6 Air Discharge A Dual Power Supply Auto Alternate(Interlocking contactor)
U Upflow T Dual Power Supply Auto Alternate(ATS)
D
Downflow
Digit18 Lock Out Low Voltage Option
Digit7 System type
0 None
A Air cooled H Reheat & Humidity Lockout
W Water cooled Digit19 Monitoring
D Dual Cool-Chilled water+Air cooled 0 No Card
H Dual Cool-Chilled water+Water cooled 7
IS-UNITY Card
Digit8 Fan C ICOM DO Card
1 EC plug fan U IS-UNITY Card & ICOM DO Card
Digit9 Power Supply Digit20 Sensors
3
380-415V / 3ph / 50Hz+N
0 None
T
380-415V / 3ph / 60Hz+N
S
Smoke Sensor
Digit10 Cooling System
H High Temperature
C Compliant Scroll Single Circuit, R407C N Supply Air Temperature Sensor
S Compliant Scroll Dual Circuit, R407C F
Smoke & High Temp
E Digital Scroll Single Circuit, R407C A Supply air pressure sensor
D Digital Scroll Dual Circuit, R407C L Water Flow Sensor
4 Compliant Scroll Single Circuit, R410A X Other Sensor
6 Compliant Scroll Dual Circuit,R410A Digit21 Packaging
7 Digital Scroll Single Circuit,R410A P Packaging - Standard Cardboard and Wooden Pallet
T Digital Scroll Dual Circuit,R410A C Packaging - Wooden crate Export
Digit11 Humidification Digit22 Special Requirements
0 None A SFA - none
H Infrared Humidifier Z For Internal Use Only(For Australia and New zealand)
S
Electrode humidifier
E For Export
Digit12 Display Digit23 Order Identifier
S Standard Display 0 Standard Static
L Large Display 1 High ESP 100 Pa
Digit13 Re-Heating
2 High ESP 200 Pa
0 None 3 Other High ESP
1 Electric heating Std 1 Stage X SFA Included
2
Electric heating Opt. 2 Stage
Digit24 Order Identifier
Digit14 Air Filter 0 None
2G4 L Air cooled-long piping>30m
3F5 C Low temp Kits
Digit15 Coil and Valves B Low temp Kits+Long piping
S
Standard DX Air cooled coil，TXV X SFA Included
E
Standard DX Air cooled coil，EEV Digit25 Order Identifier
4 Dual Cool Coil,BPHE-2way,CW 2 way,TXV 0 None
K Dual Cool Coil,BPHE-3way,CW-3 way,TXV X SFA Included

2 Chapter1 Overview
Liebert. PEX+Series Precision Air Conditioner User Manual
1.2 Appearance
Liebert.PEX+ appearance is shown in Figure 1-2 with P2080UA as an example.
Figure 1-2 Appearance
1.3 Main Components and Optional Features
The components include indoor unit, condenser and remote monitoring software.
1.3.1 Components of Indoor Unit
The indoor unit includes compressor, evaporator, electronic expansion valve, infrared humidifier, DC speed-regulated
centrifugal fan (“EC fan” for short hereafter), electric heater, sight glass, filter drier and iCOM controller (Precision
Air-Conditioner controller). The descriptions of the components are given in Table 1-1.
Table 1-1 Descriptions of main components of indoor unit
Components
Descriptions
Compressor
Highly effective Copeland scroll compressor is used, featuring low vibration, low noise and high
reliability.
The Rotalock (screw thread) connection mode makes the maintenance easier.
Evaporator
Adopt a fin-tube heat exchanger with high efficiency.
The distributor is designed and verified according to individual model to ensure that the refrigerant is
distributed evenly in each loop, improving the heat exchanger efficiency to a great extent.
Electronic
expansion valve
The electronic expansion valve is very precise and accurate device which can react instantaneously
to any kind variation or abnormality occurs during air-conditioners working.
Infrared humidifier
The infrared humidifier has a simple structure, which is easy for teardown, cleaning and maintenance.
Application of the infrared humidifier can reduce the dependence on water quality. It also features fast
startup, short humidifying time, large humidifying capacity and high humidifying efficiency.
Fan
PEX+ series use EC fan, which features high efficiency, energy-saving, space-saving and low noise.
EC fan unit uses elaborate structure design, and the downflow unit uses the ‘in-floor’ design, which
positions the fan unit below the floor to further improve the efficiency of air supply.
Electric heater
The electric metal heater is used. It features fast heating speed and even heat and high reliability.
Sight glass
The sight glass is the window of the system cycle, for observing the refrigerant state, mainly the
moisture content of the system.When the moisture content exceeds the standard, the color will be
changed.
iCOM
Controller
LCD screen with blue backlight and 128 ×64 pixels, or selects the large screen with 320 ×240 pixels
The multi-level password protection can effectively prevent unauthorized operation.
Self-recovery upon power failure
The operation time of main components is available through the menus.
The expert-level fault diagnosis system can display the current fault information automatically,
facilitating the maintenance.
It can store up to 400 historical event records.
There are two kinds of panels for option: one with common screen and the other with large screen
Filter drier
The filter drier eliminates the moisture effectively in the system, and also filtrates the impurities
generated during the long-term system operation so as to ensure normal system operation.

Chapter1 Overview 3
Liebert. PEX+Series Precision Air Conditioner User Manual
1.3.2 Condenser
Refer to condenser user manual.
1.3.3 Remote Monitoring Software
Through the configured RS485 or TCP/IP port, Liebert.PEX+ can communicate with the host computer and receive the
control of the host software.
1.3.4 Optional Features
The optional parts include: Extension kit, low temperature kit, two-level electric heater, no heater, no humidifier,
plenum for upflow unit, electrode humidifier, water cooled unit and thermal expansion valve.
Extension kit
If there is a requirement for long piping / high vertical drop between the indoor unit and condenser according to actual
application condition, an extension kit shall be configured and the specific selection is described in 3.6.1 Pipe
Extension Kit (Optional) .
Low temperature kit
In winter (outdoor temperature below -15℃), the air conditioner shall use a low temperature kit for cooling. This kit is
inside the unit. User should consider the low temperature environment to make reasonable selection.
Two-stage electric heater
According to user requirement, a two-stage electric heater shall be used and the heating capacity shall be identical
with the one-stage heater
No heater
Liebert.PEX+AC shall have the option without heating according to user requirements.
No humidifier
Liebert.PEX+AC shall have the option without humidifying according to user requirements.
Plenum
The upflow unit shall be configured with a plenum with its configuration listed in 3.3.3 Plenum dimensions (for upflow
unit). For special plenum, please contact Emerson.
Electrode humidifier
Liebert.PEX+AC shall have the option of electrode humidifier according to user requirements. The electrode
humidifier has a different requirement for water inlet / outlet pipes with the standard infrared humidifier. Refer to 3.6.3
Connecting water inlet pipe of humidifier for the configurations of water inlet/outlet pipes of electrode humidifier.
Thermal expansion valve
The standard configuration is electronic expansion valve, and optional thermal expansion valve can be provided
according to user requirements.
1.4 Storage Environment
See Table 1-2 for storage environment requirement.
Table 1-2 Storage environment requirement
Item
Requirement
General requirements
Indoor, clean, no dust
Ambient humidity
5%RH to 85%RH (non-condensing)
Ambient temperature
-20℃to +54℃
Storage time
Total transportation and storage time should not exceed six months. Otherwise, the performance needs
to be re-calibrated

4 Chapter2 Instructions for Installation Preparations
Liebert. PEX+Series Precision Air Conditioner User Manual
Chapter 2 Instructions for Installation Preparations
Liebert.PEX+ is professional equipment, and there are lots of complex installation works, so the preparation is very
important. This chapter details the installation preparation, including how to prepare the installation environment and
space and reserve the maintenance space, and how to unpack and inspect. Please read this chapter carefully before
installation.
2.1 Equipment Room Requirement
The requirements are as follows:
1.The equipment room should have good heat insulation.
2.The equipment room should have sealed damp proof layer. The damp proof layer of the ceiling and walls must use
polyethylene film or be applied with moisture proof paint. Thecoating of the concrete wall and the floor must be
damp proof.
3.All the doors and windows should be closed and the seams (if any) should be as narrow as possible to prevent the
outdoor air from entering the equipment room, which may increase the load of heating, cooling, humidifying and
dehumidification of the system. It is recommended that the inhalation of outdoor air be kept below 5% of the total
indoor airflow.
2.2 Installation Space
2.2.1 Installation Space Requirements
Adequate installation space for the indoor unit must be provided. The indoor unit of air cooled product must be
installed on the floor of 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 floor of equipment room or computer
room.
warning
！
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 in the vicinity of 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 other devices (such as smoke detector) over the cabinet.
2.2.2 Maintenance Space requirement
Be sure to reserve maintenance space when installing the equipment. Leave a maintenance space of 850mm in front
of the air conditioner unit normally, and the minimal maintenance space is not less than 600mm.The requirement for
maintenance space is given in Figure 2-1.

Chapter2 Instructions for Installation Preparations 5
Liebert. PEX+Series Precision Air Conditioner User Manual
Figure 2-1 Maintenance space of unit
2.3 Operating Environment
The operation environment of Liebert.PEX+ meets the requirements of GB4798.3-2007.See Table 2-1 for details.
Table 2-1 Operating environment requirement
Item
Requirement
Ambient temperature
Indoor
0°C ~ 40°C, the unit should not run in 32~40℃environment for a long time.
Outdoor
Air-cooled:－35℃～＋45℃(Low-temp kit is required when the temperature is below －
15℃)
Protection level (indoor
unit)
IP20
Altitude
<1000m. Above that, derating is required
Operation voltage
range
380V (-10% ~ +15%), 3N~ 50Hz
 Note
When the unit is used in the following condition, please contact Emerson:
If the unit voltage exceeds the operating voltage range.
Derating for altitude above 1000m.
Other applications outside of applicable scopes.
2.4 Unpacking And Inspection
2.4.1 Transportation And Movement
Railroad transportation and shipping are the recommended means of transportation. If truck transportation is
unavoidable, choose roads that are less bumpy in order to protect the equipment.
The Liebert.PEX+ series air conditioner is heavy (see Table 3-1 for the weight). It is recommended to use mechanical
equipment such as an electric forklift to unload and move the equipment to the place close to the installation site. If an
electric forklift is used, insert the tines of the forklift below the pallet, as shown in Figure 2-2. Align the tines with the
center of gravity to prevent the equipment from falling over.
1975
900

6 Chapter2 Instructions for Installation Preparations
Liebert. PEX+Series Precision Air Conditioner User Manual
Figure 2-2 Inserting and movement
When moving the indoor unit, keep the obliquity within the range from 75° to 105°, as shown in Figure 2-3。
105
75
Figure 2-3 Moving obliquity of indoor unit
2.4.2 Unpacking
Move the equipment to the place closest to the final installation site and then unpack it.
Follow the procedures below for unpacking:
1. Remove the side panels and top cover
Liebert.PEX+ series air conditioner uses the international packaging. You can use a hammer or straight screwdriver to
straighten the connection hook that connects the side panels to the top cover, as shownin Figure 2-4.
Figure 2-4 Straightening the hook
At first, straighten all the hooks that fix side panel I, and remove side panel I. Then straighten all the hooks that fix side
panel II, and remove side panel II. At last remove top cover III, as shown in Figure 2-5 .

Chapter2 Instructions for Installation Preparations 7
Liebert. PEX+Series Precision Air Conditioner User Manual
Figure 2-5 Removing side panels and top cover
2. Remove the base pallet
The unit is fixed onto the base pallet with M8×65 bolts or 8×90 screw, as shown in Figure 2-6. You can use a 17mm
open-end spanner, ratchet spanner or sleeve to remove the fixing bolts.
Bolt
）
（M8 ×65
Screw
（
8×90）
P1020-P1025 unit P1030-P2100 unit
Figure 2-6 Fixing screw on the base pallet
2.4.3 Inspection
Check against the Packing List that the fittings are complete and the components are intact. If any parts are found
missing, or damaged, please report to the carrier immediately. If any hidden damages are found, please report to the
local offices of the carrier and Emerson.
Kg
1790x950 x 2020mm
1816x976 x 2175mm
I
I
III
II
II

8 Chapter3 Mechanical Installation
Liebert. PEX+Series Precision Air Conditioner User Manual
Chapter 3 Mechanical Installation
To achieve the designed performance and maximize the product life, correct installation is vital. This chapter
introduces the installation notes, installation layout, installation procedures, piping and fan lowering operations.
3.1 Installation Notes
1.Prior to installation, be sure to read the whole contents of Chapter 2 Instructions for Installation Preparations, and
confirm that the installation positions have been confirmed according to the requirements of 2.2 .
2.Liebert.PEX+ air-cooled series air conditioner is designed for split floor installation. The indoor unit must be installed
on the floor of the equipment room or computer room, and the condenser can be installed outdoors or on the floor of
other rooms. The Liebert.PEX+ water-cooled air conditioner is designed for integrated floor installation. It should be
installed on the floor of the equipment room or computer room.
3.The selection, layout and fixing of the pipes shall comply with industrial standard.
4.Pressure drop, compressor oil return, noise reduction and vibration shall be considered in design and installation.
5.The unit shall be fixed by screws and mounting rails to avoid shaking during startup or operating processes.
3.2 System Installation Arrangement
3.2.1 Overall System Arrangement
The overall arrangement of Liebert.PEX+ series air conditioner is shown in Figure 3-1.
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 3-1 Overall system arrangement
 Note
The single system is used as an example to describe the double system.
：Emerson piping.
：Field piping (by technicians).
*: Components are not supplied by Emerson but are recommended for proper circuit operation and
maintenance.
+: Components are required when the equivalent length exceeds 30m.

Chapter3 Mechanical Installation 9
Liebert. PEX+Series Precision Air Conditioner User Manual
3.2.2 System Installation Illustration
The installation modes of the unit are shownin Figure 3-2 and Figure 3-3.
Figure 3-2 Condenser installed higher than compressor
Figure 3-3 Condenser installed lower than compressor
 Note
If the condenser is installed higher than the compressor (see Figure 3-2), a back bend should be fitted to the
discharge line and liquid line of the condenser, so as to prevent the liquid refrigerant from flowing back when the
condenser stops.
The top end of the back bend must be installed higher than the highest copper pipe of the condenser.
3.3 Mechanical Parameters
3.3.1 Dimensions and weight of indoor unit
The dimensions and weight of the indoor unit are shownin Figure 3-4, Figure 3-5 and Table 3-1.
Drain pipe for condensed water
gas pipe slope
Thermal isolation
layer under floor Floor
.
Copper pipe bracket
Liquid pipe (avoid direct sun shine)
Oil trap
Invert bend (higher than the top copper pipe of condenser)
Outdoor unit
Indoor unit
Sealed
Max 7.5m
Water inlet pipe of humidifier
Movable floor
Max 20m
Thermal isolation
layer under floor
Sealed
Floor
Copper pipe
bracket
Indoor unit
Outdoor unit (Condensor)
Max5m
liquid pipe slope
Drain pipe for condensed water
Inlet pipe of humidifier
Movable floor
Gas pipe slope

10 Chapter3 Mechanical Installation
Liebert. PEX+Series Precision Air Conditioner User Manual
Figure 3-4 Outline drawings of the upflow indoor unit (unit: mm)
Figure 3-5 Outline drawings of the downflow indoor unit
Table 3-1 Dimensions and weight of indoor unit
Model
Dimensions (W×D×H)(mm)
Net weight (kg)
P1020U(D)A13C
853×874×1970
320
P1025U(D)A13C
853×874×1970
340
P1030U(D)A13C
1130×995×1975
400
P1035U(D)A13C
1130×995×1975
420
P1040U(D)A13C
1330×995×1975
460
P1040U(D)A13S
1330×995×1975
480
P1050U(D)A13C
1330×995×1975
530
P1050U(D)A13S
1330×995×1975
570
P2060U(D)A13S
1830×995×1975
690
P2070U(D)A13S
1830×995×1975
730
P2080U(D)A13S
2230×995×1975
770
P2090U(D)A13S
2230×995×1975
805
P2100U(D)A13S
2230×995×1975
810
3.3.2 Dimensions and weight of condenser
Refer to condenser user manual for the condenser dimensions and weight.
3.3.3 Plenum dimensions (for upflow unit)
The dimensions of plenum are shown in Table 3-2.
D
H
W
W
D
H
W
D
H
W
D
H
W
D
H
W
H
D

Chapter3 Mechanical Installation 11
Liebert. PEX+Series Precision Air Conditioner User Manual
Table 3-2 Plenum dimensions (unit: mm)
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)
 Note
If the height of the plenum selected for air conditioner unit exceeds 600mm, consult Emerson for non-standard
production.
3.3.4 Positions and dimensions of air outlet
Base pallet cut-out location dimensions
The cutout position and dimensions are shown in Figure 3-6.
140
45 181 72
161 161
181
72
72
210
250
161
C/R
P
C/R
850
798
190
P1020 and P1025 unit cut-out location
1130mm/1830mm unit cut-out location
1330mm/2230mm unit cut-out location
P: Cable inlet/outlet
D: Drain pipe hole
H: Humidifier incoming water pipe hole
C/R: cooling water inlet and outlet pipe holes/refrigerant inlet and outlet pipe holes
Figure 3-6 Base pallet cut-out locations of upflow series (unit: mm)
70
120
49
H
D
69
320
C / R
P
1130
70
120
49
H
D
69
320
C / R
P
1830
H
D
205
63
69
320
C / R
P
155
1330
H
D
320
205
C / R
P
155
69 63
2230

12 Chapter3 Mechanical Installation
Liebert. PEX+Series Precision Air Conditioner User Manual
Position and dimensions of air outlet on top cover
The position and dimensions of air outlet on top cover of upflow unit are shown in Figure 3-7 and Table 3-3.
Figure 3-7 Position of air outlet on top cover of upflow unit
Table 3-3 Dimensions of air outlet on top cover of upflow unit (unit:mm)
Model
A
B
C
P1020～P1025
720
795
800
P1030～P1035
650
900
700
P1040～P1050
850
900
900
P2060～P2070
650
900
1400
P2080～P2100
850
900
1800
Side panel knock-out locations
If piping and wiring from the base are difficult, connection from side panel can be selected. The locations and
dimensions of knock-out holes are shown in Figure 3-8.You should select the inlet and outlet holes according to the
actual needs. Ensure only one service is used per opening.
P1020 and P1025 series knock-out
A
B
C
AA
B
C