Emerson Chilled Water Series User Manual

Chilled water air conditioner
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Table of Contents
Liebert PEX
Effi ciency And Reliability For High Availability Cooling
Next Generation Critical Cooling
for Room and Row
Chilled Water Models
User Manual

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  Summary of Contents for Emerson Chilled Water Series

  • Page 1 Next Generation Critical Cooling for Room and Row Liebert PEX Effi ciency And Reliability For High Availability Cooling Chilled Water Models User Manual...
  • Page 2: User Manual

    Liebert.PEX Chilled Water Series Air Conditioner User Manual Version V1.1 Revision date May 6, 2010 31011830 Emerson Network Power provides customers with technical support. Users may contact the nearest Emerson local sales office or service center. Copyright © 2010 by Emerson Network Power Co., Ltd.
  • Page 4: Table Of Contents

    Contents Chapter 1 Overview ................................1 1.1 Model Description ............................... 1 1.2 Main Components ............................... 1 1.3 Remote Monitoring Software ..........................2 1.4 Environmental Requirements ..........................2 1.4.1 Operation Environment ........................... 2 1.4.2 Storage Environment ..........................3 Chapter 2 Mechanical Installation ........................... 4 2.1 Installation Preparation ............................
  • Page 5 5.4 Startup Interface ............................... 36 5.5 Main Interface ..............................36 5.6 USER MENUS ..............................37 5.6.1 PASSWORD ............................37 5.6.2 SETPOINTS ............................37 5.6.3 EVENT LOG ............................37 5.6.4 GRAPHICS .............................. 39 5.6.5 SET ALARMS ............................39 5.6.6 SENSOR DATA ............................40 5.6.7 DISPLAY SETUP ............................
  • Page 6 7.3.1 Fan Bearing And Blades ........................76 7.3.2 Belt ................................76 7.3.3 Motor............................... 76 7.4 Infrared Humidifier ............................76 7.5 Electrical Heater ..............................78 7.6 Water Flow Control Valve ..........................79 Chapter 8 Failure Diagnosis And Troubleshooting ...................... 80 Appendix 1 The Structure Chart Of Electric Control Box .................... 83 Appendix 2 Circuit Diagram ............................
  • Page 8: Chapter 1 Overview

    Use finned-tube heat exchanger with high heat emission efficiency. The model-specific distributions can ensure the even distribution of chilled water in each loop and greatly improve the efficiency of the heat exchanger, as well as minimize the water resistance of heat exchanging coil. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 9: Remote Monitoring Software

    Indoor temperature: 4°C ~ 40°C Operation range Chilled water supply temperature: 5°C ~ 13°C Altitude < 1000m. Above that, derating is required Operation voltage range 400V (-10% ~ +10%), three-phase AC, 50Hz Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 10: Storage Environment

    Indoor, clean, no dust Ambient humidity 5%RH ~ 85%RH (non-condensing) Ambient temperature -20°C ~ +54°C Total transportation and storage time should not exceed 6 months. Otherwise, the performance Storage time needs to be re-evaluated Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 11: Chapter 2 Mechanical Installation

    1. Removing the side boards and top cover The chilled water AC uses international packaging. You can use a hammer or straight screwdriver to straighten the hook, as shown in Figure 2-3. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 12: Inspection

    After receiving the product, you should check it against the packing list. If any parts are found missing, distorted or damaged, please report to the carrier immediately. If any covert defects are found, please report to the carrier and the local office of Emerson Network Power Co., Ltd. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 13: Installation Notes

    5. In winter, the AC unit in northern area does not operate for a long term; you must empty the water in AC unit to protect the heat exchanger from frost cracking. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 14: Mechanical Parameters

    The dimensions of the chilled water AC are shown in Figure 2-7, Figure 2-8, Figure 2-9 and Table 2-1. Upflow unit (forward fan) Upflow unit (backward fan) Downflow unit (forward fan) Downflow unit (backward fan) Figure 2-7 One-bay series (unit: mm) Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 15 Chapter 2 Mechanical Installation Upflow unit (forward fan) Upflow unit (backward fan) Downflow unit (forward fan) Downflow unit (backward fan) Figure 2-8 Two-bay series (unit: mm) Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 16 P2070 1704 × 874 × 1970 ≤ 476 P2090 1704 × 874 × 1970 ≤ 505 P2100 1704 × 874 × 1970 ≤ 530 P3110 2553 × 874 × 1970 ≤ 656 Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 17 Figure 2-10 One-bay plenum Figure 2-11 Two-bay plenum Figure 2-12 Three-bay plenum Table 2-2 Dimensions of plenum (unit: mm) Type One-bay 400 (600, optional) Two-bay 1704 400 (600, optional) Three-bay 2553 400 (600, optional) Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 18 Two-bay series 78.3 Condensed water drain hole Chilled water drain hole 146.4 Chilled water inlet opening Cable inlet/outlet opening Water inlet opening 7 bottom plate fastening holes for humidifier Three-bay series Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 19 Cable inlet/outlet opening 6 bottom plate Chilled water drain hole fastening holes Water inlet opening for humidifier 88.5 Three-bay series Figure 2-14 Base cut-out locations of the forward fan downflow series (unit: mm) Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 20 Chilled water inlet opening Cable inlet/outlet opening Chilled water drain hole Water inlet opening for humidifier 1566 45 44 Three-bay series Figure 2-15 Base cut-out locations of the backward fan downflow series (unit: mm) Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 21: Installing Chilled Water Ac Unit

    1. To ensure normal operation, the installation space for the indoor unit shall be capacious enough. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 22: Installation Procedures

    4- Ф 14 cabinet installation hole Φ S teel plate Rubber cushion Installation hole Rubber cushion (bottom) (lateral) for expansion bolt Rear side of cabinet Figure 2-18 Mounting base of one-bay series (unit: mm) Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 23 4-Ф 14 cabinet installation hole Φ Rubber cushion (lateral) Rear side of cabinet S teel plate Rubber cushion (bottom) Downflow Figure 2-19 Mounting base of two-bay series (unit: mm) Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 24 Front side of cabinet Rubber cushion (bottom) S teel plate Installation hole for expansion bolt Rear side of cabinet Rubber cushion (lateral) Angle steel Downflow Figure 2-20 Mounting base of three-bay series (unit: mm) Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 25 Remove the transportation fixing board (7 fixing screws); Remove the pallet (2 fixing screws);  Note When removing the pallet, you must grasp the handle and support the fan so as to prevent the fan from falling. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 26: Piping

    3. When connecting the drain pipe, make sure that the U bend is installed vertically and the ‘U’ shape is not distorted, so as to ensure that the cooling water can be drained immediately and effectively. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 27 Water pressure should be able to overcome the water pressure drop caused by all the components of water system. Considering the possibility that water pressure drop would increase due to incrustation and impurities resulted from long-time running of the system. Therefore, when choosing the head components Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 28: Removing Transport Fastener And Vibration Absorber

    During transportation, to protect the semi-free structure from failing or collapsing due to resonation, the upflow unit is especially fastened with sheet metal connector (left and right symmetrical, one at each side), as shown in Figure 2-28. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 29 Before operating the unit, check the protection foam, and connect high water-level detection switch cable. If you operate the unit without complying with this, the infrared humidifier cannot operate normally and fire may be caused. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 30 3. Lead the detection switch cable of the high water-level through the cable access hole, as shown in Figure 2-30. Then insert the corresponding cable terminals and the HWA cable terminals in the connecting box, as shown in Figure 2-33. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 31: Adjusting Water Level Regulator

    The water level regulator of the infrared humidifier is screwed down completely. Before commissioning, unscrew the water level regulator till its head is 45mm above the water tray bottom, as shown in Figure 2-35. Figure 2-35 Adjusting distance from the water tray Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 32: Installation Inspection

    9. The water level regulator of the infrared humidifier has been unscrewed to the required height; 10. The debris (such as transportation materials, structure materials and tools) inside or around the equipment has been cleaned. After confirming the preceding points, you can then start the electrical installation. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 33: Chapter 3 Electric Installation

    Opening the front door of the chilled water AC unit can reveal the interfaces of electrical control box, as shown in Figure 3-1, Figure 3-2 and Figure 3-3. Power interface Control interface N/PE terminal block Upflow Power interface Control interface N/PE terminal block Downflow Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 34: Connecting Power Cable Of Chilled Water Ac Unit

    Fix the input cables to the cable clamp located on the right inner side panel, as shown in Figure 3-5. As for the cable specification, see the unit maximum operation current in Table 3-1. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 35: Connecting Control Cables

    Alarm output of short line if the remote smoke sensor shut down is connected Figure 3-6 Wiring of control interfaces  Note Before connecting the control cables, the wiring personnel must take antistatic measures. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 36: Installation Inspection

    4. The ratings of the circuit breakers and fuses are correct. 5. The control cables are properly connected. 6. All the cable connections are fastened, with no loose screws. You can start commissioning after confirming the preceding points. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 37: Chapter 4 System Start-Up Commissioning

    4.1 Locating MCBs The MCBs are located as shown in Figure 4-1, Figure 4-2 and Figure 4-3. Upflow Downflow Figure 4-1 MCBs of one-bay series Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 38 Figure 4-2 MCBs of two-bay series Upflow Downflow Figure 4-3 MCBs of three-bay series 1: Fan MCB 3: Infrared humidifier MCB 5: Main isolation switch 2: Electrical heater MCB 4: Control board MCB Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 39: Start-Up Commissioning

     Note After commissioning, restore the humidity setting to the default or the original setting. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 40: Inspection After Commissioning

    1. Check that all output functions are automatic; 2. Check that the temperature & humidity settings and control precisions are set reasonably; 3. Make sure all the other functions are set reasonably. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 41: Chapter 5 Icom Controller

    The alarm indicator turns on in red upon alarms. It is off after the alarm is cleared The operation indicator is on in green when the unit is operating. When the unit is shut down, it Operation indicator will be on in yellow Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 42 You do not need to start it manually. 2. When the system is in the test state, the setpoints will not be written into the iCOM controller. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 43: Structure Chart Of Control Menu

    The icons of the graphical mode and the simple mode on the main interface are defined in Table 5-3. Table 5-3 Definition of icons Icon Definition Icon Definition Fan running Free cooling Cooling Maintenance Hot water heating Dehumidifying Electric heating Humidifying Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 44: User Menus

    5.6.3 EVENT LOG You can enter the EVENT LOG menu without a password, as shown in Figure 5-6. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 45 Chapter 5 iCOM Controller EVENT LOG P (01) 1/31/2007 10 00 Warning Power loss Figure 5-6 EVENT LOG menu Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 46: Graphics

    Note It is recommended not to change the system defaults. If you consider it necessary to change the defaults, consult professionals first and set the alarm settings under the guidance of them. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 47: Sensor Data

    U313 Hi Te H U316 Lo Hu S (hour) (second) Daily high temperature U313 Hi Te M U316 Lo Humi Daily low humidity (minute) Daily high temperature U313 Hi Te S (second) Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 48: Display Setup

    Chapter 5 iCOM Controller 5.6.7 DISPLAY SETUP The DISPLAY SETUP menu is used to set the LCD display attributes. Password is not required for changing the setpoints. The parameters are described in Table 5-8. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 49: Total Run Hrs

    U509 LIMIT 32000hr U505 CW/FC 1000hr Chilled water/free U510 Humidifier U505 LIMIT 32000hr cooling U510 LIMIT 32000hr U506 HG/HW 23hr U511 DEHUM Hot gas/hot water Dehumidification U506 LIMIT 32000hr U511 LIMIT 32000hr Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 50: Sleep Mode

    The SERVICE MENUS are displayed in five pages. Each page displays one or two submenus. Press the enter button to highlight the submenus, and use the up or down button to scroll up or down. Press the enter button to enter the selected submenu. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 51: Password Level

    FC DT 4.5°C 0°C ~ 20°C DT between Room Air/FC Fluid S139 MIN CW Yes, No Minimum CW temperature protection selection S140 MIN CW 7°C 0°C ~ 20°C Minimum CW temperature value Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 52: Standby

    WELLNESS menu and the equipment operation historical data, so as to find out the next system maintenance time. Informing the maintenance personnel of the maintenance time makes the air conditioner run in the optimal mode, which reduces the chances of faults and raises the system reliability. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 53 Table 5-17 Descriptions of WELLNESS COMP2 parameters Parameters Default Description S035 STARTS Number of compressor 2 starts since the last maintenance S036 RUN HRS Compressor 2 run hours since the last maintenance Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 54 WELLNESS HUM Table 5-21 Descriptions of WELLNESS HUM parameters Parameters Default Description S079 STARTS Number of humidifier starts since the last maintenance S080 RUN HRS Humidifier run hours since the last maintenance Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 55: Diagnostics

    Diagnosis switch of liquid line solenoid valve of S322 LLSV2 On, Off compressor 2 Diagnosis switch of electric heater 1. The ‘On’ setting of S324 EL HEAT1 On, Off. this parameter can start electric heater 1 only when the Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 56 C2 OL OK, ACT means abnormal Humidifer fault state. OK means normal. ACT means S367 HUM PROB OK, ACT abnormal S368 OK, ACT Status DT1 (Outdoor/Glycol) S369 OK, ACT Status DT2 (Glycol/Room) Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 57: Set Alarms

    Customized alarm 3 FLOLC Flow AL LC Swap V Swap Valve C-In4 Customized alarm 4 ComPD Comp Lock PD ECFan EC Fan Fail Reheater lockout En FC Enable FC, Humidifier lockout RJVFD HTRJ VFD Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 58 Working hours exceeded S292 Condensor 2 Fail S263 Smoke detected S293 EC Fan fail S264 Water under floor S294 High supply air temperature S265 Conderser pump high water S295 Low supply air temperature Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 59: Calibration

    See Table 5-27 for parameter descriptions. Table 5-27 Descriptions of NETWORK SETUP parameters Setting Parameters Default Description range S802 #UNITS 1 ~ 32 Range: 1 ~ 32 S803 TEAMWORK No, 1, 2 Range: No, 1, 2 Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 60: Options Setup

    Default Setting range Description Auto, 1 Compressor sequence. Range: Auto, 1 (compressor 1 being the S402 COMP SEQ Auto (compressor 1 primary one), 2 (compressor 2 being the primary one) being the Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 61: Service Info

    The ADVANCED MENUS include PASSWORD LEVEL, FACTORY SETUP and PASSWORDS, as shown in Figure 5-10. ADVANCED MENUS 1 / 2 ADVANCED MENUS 2 / 2 PASSWORD LEVEL PASSWORDS ACCESS FACTORV SETUP Figure 5-10 ADVANCED MENUS 5.8.1 PASSWORD LEVEL It is operated by Emerson service personnel. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 62: Factory Setup

    COMP DLY Compressor delay time A107 COMP ON 0 ~ 5min Compressor minimum on time A108 COMP OFF 3min 0 ~ 5min Compressor minimum off time A109 PUMPDOWN Yes, No Pump down enable Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 63 Low pressure threshold phase 1 A118 LP PH2 Low pressure threshold phase 2 A119 LC PRE 0.0s Liquid control pre-time A120 LC POST 0.0s Liquid control post-time A121 CHARGE P Loss of Charge Protection Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 64 Dehumidification with compressor. When 1 or 2 is selected, compressor 1 or 2 is used for A152 DEH COMP 1, 2, both dehumidification. When Both is selected, the two compressors are both used for dehumidification Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 65 AO4 STA 0V ~ 10V Analog output 4 start voltage A175 AO4 END 100% 0% ~ 100% Analog output 4 end percentage A175 AO4 END 0V ~ 10V Analog output 4 end voltage Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 66: Mbv Settings

    SERVICE OFFSET A417 START DELAY A418 STOP DELAY A419 4ST OPEN PRESET A420 4ST CLOSE PRESET A424 MBV REINT A425 READ INTERVAL A426 DIG SCROLL FILTER A427 4ST-30SEC LOADING A428 PUMPDOWN PRESS Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 67: Event Name And Definition

    UNIT HRS EXCEEDED Unit has exceeded operating time COMP 1 HRS EXCEEDED Compressor 1 has exceeded operating time limit HUM HRS EXCEEDED Humidifier has exceeded operating time limit SUPPLY SENSOR FAILURE Supply sensor failure Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 68 DIG SCROLL1 HIGH TEMP Digital scroll 1 high temperature DIG SCROLL2 HIGH TEMP Digital scroll 2 high temperature Dummy 099 Dummy alarm 099 RESERVED 100 Reserved 100 RESERVED 101 Reserved 101 RESERVED 102 Reserved 102 Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 69 Low refrigerant temperature REFRIGERANT SENSOR FAIL Refrigerant sensor fail HIGH TEMP SENSOR B High temperature sensor B LOW TEMP SENSOR B Low temperature sensor B COMP 2 LOW PRESSURE Compressor 2 low pressure Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 70 Room humidity problem iCOM-DO #0 ~ #2 DISCONNECTED iCOM-do #0 ~ #2 disconnected FEEDBACK SIGNAL 2 FAILURE Feedback signal 2 failure BOTTOM FAN FAILURE Bottom fan failure EC FAN FAULT EC fan fault Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 71: Chapter 6 Application Of Intellislot

    6.1 Introduction Of Host Communication Card The chilled water series air conditioner supports two communication cards below: 1. TCP/IP communication card The TCP/IP communication card is shown in Figure 6-1. This card can provide network port, MIB library and browse the data through IE.
  • Page 72: Installing Host Communication Card

    6.2 Installing Host Communication Card Installing communication card The chilled water series air conditioner units have been equipped with installation boxes 1 and 2. If you want to install the host communication configuration, insert the communication card into the installation box 1 and tighten the bolts as shown in Figure 6-3.
  • Page 73: Setting Hyperterminal

    2. In the Connect To dialog box, choose the serial port being used (such as ‘COM1’), and click the OK button, as shown in Figure 6-6. Figure 6-6 Choosing serial port 3. Set the communication parameters shown in Figure 6-7 and click the OK button. Figure 6-7 Setting port property Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 74: Setting 485 Communication Card

    4. Type ‘1’ and select Modbus protocol, the interface shown in the following figure will appear. 5. Type ‘3’ and select the ID used to communicate between the communication card and the host, the interface shown in the following figure will appear. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 75: Setting Tcp/Ip Communication Card

    485 communication card will be restarted. 10. On the main interface, type ‘4’, and you can check whether the communication status between the communication card and the chilled water series air conditioner is normal, as shown in the following figure. 6.3.3 Setting TCP/IP Communication Card Set the parameters of the TCP/IP communication card according to the following procedures: 1.
  • Page 76 4. Press Esc button to exit and return to the main interface, as shown in the following figure. If you type ‘x’, the setting can be saved. After saving, the TCP/IP communication card will be restarted. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 77: Setting Snmp Parameters Of Tcp/Ip Communication Card

    5. On the main interface, type ‘5’, and then you can check whether the communication status between the communication card and the chilled water series air conditioner is normal, as shown in the following figure. 6.3.4 Setting SNMP Parameters Of TCP/IP Communication Card After the HyperTerminal of the TCP/IP communication card is set, you can set the parameters for this communication card.
  • Page 78 After normal communication, the interface shown in Figure 6-9 will appear. Figure 6-9 Initial interface (2) 2. Click the configure tab to enter the configuration interface, as shown in Figure 6-10. Figure 6-10 Configuration interface Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 79 1. Before setting the NMS, the Edit button is displayed in the interface. After editing the configuration, the Edit button will become the Save button. 2. After the NMS is configured, you must click the Save button to save the setting. Figure 6-12 NMS configuration interface of SNMP host monitoring center (1) Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 80: Host Communication Networking Diagram

    485 connection AC 1 485 card 485 connection 485 connection AC 2 485 card Monitoring center 485 connection AC 32 485 card Figure 6-15 Networking figure of 485 communication card Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 81: Chapter 7 System Operation And Maintenance

    Note 1. During the operation of the chilled water series cooling system, lethal voltage may be present in the internal parts. It is a must to obey all the notes and warnings marked on the equipment or contained in this manual, otherwise injury or fatality may occur.
  • Page 82: Filter

    Figure 7-2. 滤网堵塞开关调节旋钮 Rotary switch for filter clogging switch 过滤网堵塞开关 Filter clogging switch 风机气流安全开关 Pressure difference switch Figure 7-2 Filter clogging switch and pressure difference switch Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 83: Fan Kit

    However, the cleansing cycle varies because the water is different in different regions. It is recommended to check, and cleanse (when necessary) the water pan, once a month. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 84 The pre-fill time is different depending on the pan size. The factory default for a large pan is 60s and for a small pan is 30s. During the Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 85: Electrical Heater

    Manual reset switch Manual reset switch Automatic reset switch Automatic reset switch Upflow electrical heater Downflow electrical heater Figure 7-5 Upflow and downflow electrical heater Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 86: Water Flow Control Valve

    When there is refrigeration and dehumidification requirement, the valve would open and have water flow. When there is no refrigeration or dehumidification requirement, the valve would close and have no water flow. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 87: Chapter 8 Failure Diagnosis And Troubleshooting

    Examine whether there is 10V DC voltage between water valve VDC/mA and E5 Failure to turn on terminal. If there is, then the water valve has failures. Please replace the water the water valve valve Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 88 (For backward EC fan) ___ 3. Examine water tray mineral deposits. ___ 5. Whether blades scratch the adjacent metal plate (For backward EC fan) Signature Note: Please copy this table as an archive record. Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 89 ___ 1. Clean water pipe system. ___ 4. Check whether the contactor can pull on ___ 2. Check whether there is leakage in water or not. system. Signature Note: Please copy this table as an archive record Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 90: Appendix 1 The Structure Chart Of Electric Control Box

    Appendix 1 The Structure Chart Of Electric Control Box 3 2 1 A amplified view 10 11 17 18 Upflow 3 2 1 A amplified view 17 18 Downflow Figure 1 Internal structure of one-bay series electrical control box Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 91 5 4 3 2 1 1214 17 18 A amplified view Upflow 5 4 3 2 1 12 14 17 18 A amplified view Downflow Figure 2 Internal structure of two-bay series electrical control box Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 92 8——Control terminal 13——Isolation transformer 18——Main isolation switch 4——Infrared humidifier 9——Ground current 14——Humidification 19——Temperature/humidit detector contactor y sensor board 15——Electrical heating 5——Control board MCB 10——Power transformer 20——Main N terminal contactor 21——Main grounding terminal Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 93: Appendix 2 Circuit Diagram

    P - PURPLE GN - GREEN 2EM1 W - WHITE GY - GRAY G N/ Y- INSU L A TIONCOL O R&TRA CERC OLO R GLOBAL PEX CW UNIT Figure 4 Circuit diagram Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 94: Appendix 3 The Structure Chart Of Micro-Processing Controller Menu

    U 315 Hi Hu S U 315 Hi Humi U316 Lo Hu H U 316 Lo Hu M U316 Lo Hu S U316 Lo Humi Figure 5 Structure diagram of user menu Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 95 CO1 ON S158 CO1 OFF S159 S160 CO1 TD CO2 ON S161 CO2 OFF S162 S163 CO2 TD S164 CYCLET S165 SCRFACT ACT SCR S166 Figure 6 Structure diagram of maintenance menu Liebert.PEX Chilled Water Series Air Conditioner User Manual...
  • Page 96 Emerson Network Power Asia Marketing.AP@Emerson.com Emerson Network Power. EmersonNetworkPower.com AP11ENT-PEXCWV1-UM...

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