Liebert PEX Technical Data Manual - Small Frame
Contents
1. aluminium and corrosion resistant components Heavy duty mounting legs and all assembly hardware shall be included Condensers shall be suitable for 24 hour operation and be capable of providing vertical or horizontal discharge The condenser shall be fully factory wired to an input isolator and require 230 volt phase ___Hz electrical service The high performance heat exchanger shall include mechanically expanded cross hatched copper tubes and louvred aluminium fins for maximum heat transfer The coil shall be finished in a high performance modified epoxy coating KoilKote to offer increased protection in aggressive environments 4 2 Technical Data Manual 08 08 W Liebert PEX Small Frame Guide Specifications The coil shall be have a maximum of __ rows and fins per metre __ FPI and the face velocity shall not be more than m s ___ FPM Fan Speed Control Condenser The condenser fans shall be directly driven by __ poles rpm 230 volt ___ Hz electric motors with an IP54 enclosure rating and class F insulation The motors shall be equipped with permanently sealed ball bearings and high temperature grease The motors shall be speed controlled to ensure stable operating conditions from 5 C to 45 C ambient by a factory fitted direct acting pressure actuated electronic fan speed controller The control system shall be complete with input isolator transducers and pressure switch Water Cooled Systems The indoor evaporator unit shall include2. 485 cards can provide Liebert SiteScan Web and BMS systems with the capability to monitor your Liebert PEX unit OY Liebert Technical Data Manual 08 08 3 1 iCOM Control Additional Views Available with Large Graphic Displays e System View Allows you to see the average operation of the system or all units that are working together in Unit to Unit U2U Communications mode for Teamwork or Lead Lag from a centralised location Spare Parts List Critical spare part numbers are saved in unit memory and may be displayed on the Large Graphic Display speeding identification of parts Unit Diary Free field area within the unit memory where unit maintenance shares history with any authorised users including record of what others have done VIEW NETWORK UNIT ON ALAR OFF RENOTE OFF LOCAL OFF UNIT ON MONITORING OFF UNIT ON UNIT ON SYSTEM STANDBY STANDBY STANDBY WARNING ON STANDBY STANDBY STANDBY STANDBY UNIT 09 UNIT 10 UNIT 11 UNIT 12 UNIT 13 UNIT 14 UNIT 15 UNIT 16 p ESCRIPTION t ELEMENT HUMIDIFIER LAMP View Network U2U Configuration Example Liebert PEX units with Small Graphic Display may be centrally monitored and controlled with the Optional Wall Mounted Large Graphic Display I I r _ I I I I I L I I Operating l Operating i T l S l l Standby 1 Standby T 1 d Operating Standby Spare Parts PEX Small Frame The opt
3. 5 6 7 8 9 P 1 0 1 5 F A PM L 1 S 0 0 0 Product Range P PEX No Modules Bays Fans 1 One 2 Two Nominal kW 10 to 45 Air Path F Downflow Forward Curve U Upflow Forward Curve Cooling Type A Air Cooled W Water Cooled C Chilled Water Cooling Control P R 22 scroll 1 compressor Z R 407C scroll 1 compressor 2 2 way CWV CW zero compressors 3 3 way CWV CW zero compressors Voltage M 400 3 50 iCOM Display S Small Graphics Display L Large Graphics Display Reheat Type 0 None 1 1 Stage 2 2 Stage Humidification None S Immersed Electrode 0 Factory Configuration Number A Z Options A Z Options A Z Options W Liebert Technical Data Manudi 08108 1 5 Technical Data PEX Downflow and Upflow Units PEX Small Frame Air Water Cooled 50Hz Model Size 1010 Rated Unit Performance R 22 and R 407C 24 C DB 17 1 C WB 75 2 F DB 62 8 F WB 50 1015 2020 2025 Downflow Units RH 6 9 23 500 Sensible kW BTUH 11 0 37 500 24 C DB 16 3 C WB 75 2 F DB 61 3 F WB 45 RH Rated Unit Performance R 22 and R 407C 24 C DB 17 1 C WB 75 2 F DB 62 8 F WB 50 Upflow Units RH 24 C DB 16 3 C WB 75 2 F DB 61 3 F WB 45 Total kW 7 6 Sensible kW 7 2 BTUH 24 600 RH 10 5 15 9 20 4 35 800 54 300 69 600 9 5 14 9 20 1 32 400 50 800 68 600
4. Evaporator Fan Forward curve centrifugal fa n direct drive 10 10 No of fan assemblies 1 1 2 2 Static Regain duct Downflow units Std Motor kw HP 940 Downflow Airflow l s CFM Upflow Airflow l s CFM 2 000 860 1 830 0 75 1 0 1 070 1 880 2 140 850 1 720 1 700 1 800 3 650 3 610 Evaporator Coil Copper tubes with rifled bor e tubes louvred aluminium fins Fin series FPM 551 FPI 14 14 14 13 Compressor Copeland Compliant Scroll with Crankcase Heater 1 2 No of compressors 1 2 Unit cooling steps Safety controls kPa psig Humidifier Immersed Electrode Cleanable Capacity kg h lb hr Input power kW LP cutout in LP cutout in auto reset 140 420 HP cutout manual reset 2800 auto reset 20 60 HP cutout manual reset 400 3 3 3 3 7 7 2 5 2 5 Capacity kW Opt 2nd stage kW 2 l Technical Data Manual 08 08 W Liebert PEX Small Frame Technical Data PEX Downflow and Upflow Units Air Water Cooled 50Hz Model Size 1010 105 2020 20235 Filter Dry media disposable G4 to AS NZS1324 1 MERV 8 to ASHRAE 52 2 Downflow mm in ee M Upflow mm in EA 25 ar a a E a E Full Load Current 400 Volts 3 phase N E 50 Hz Supply Standard Unit Amps Water Cooled Condenser 316SS Brazed Plate Heat Exchanger 2 Way Valve sze 3 4 3 4 1 Flow 0 42 0 59 0 90 1 T Water EN 6 7 9 4 1
5. Water Under Floor Sensor LWD Additional water under floor sensors up to 5 in total may be series connected under the raised floor Note each unit is shipped with one 1 off LWD sensor and 3 7m 12 feet lead as standard 4 8 Technical Data Manual 08 08 W Liebert PEX Small Frame Guide Specifications Liquitect Unit Shutdown Sensor LT410 Liquitect signal shuts down unit and provides one 1 N O contact for field alarm connection Low Pressure Transducer Replaces the standard pressure switch to indicate refrigerant suction pressure via the iCOM display panel Remote Sensors Remote temperature and humidity sensor compatible with iCOM controls are available in lengths of 9 18 27 36 and 45 metres 30 60 90 120 and 150 feet Floor Stand The floor stand shall be constructed from welded galvanised steel The floor stand shall have adjustable legs and be mm in high Upflow Unit Plenum with Discharge Grille s The air plenum shall be constructed from 2mm zinc coated sheet steel and powder coated in Charcoal Grey colour with a textured finish The plenum shall be 400 mm 15 75 in high Double deflection discharge grilles made from aluminium and powder coated black shall be fitted to the front panels OY Liebert Technical Data Manual 08 08 4 9 Guide Specifications PEX Small Frame This page intentionally left blank 4 10 Technical Data Manual 08 08 Liebert PEX Small Frame Installation Guidelines Unit I
6. pre defined component operation UNIT OPTIONS iCOM Microprocessor Control With LARGE Graphic Display The iCOM unit control with large graphic display shall include all of the features as the iCOM with small graphic display except that it includes a larger graphical display and shall include the additional features of System View Spare Parts List Unit Diary The iCOM control processor shall be microprocessor based with a 320x240 dot matrix graphic front monitor display panel and control keys for user inputs mounted in an ergonomic aesthetically pleasing housing System View Status Overview System View shall display a summary of operation for the total number of operating units within a Unit to Unit U2U configuration Spare Parts List Menu shall include a list of critical spare parts their quantity and part numbers Unit Diary Menu shall include a free field area within the unit memory where unit history may be stored for reference iCOM Wall Mount LARGE Graphic Display The iCOM Large Graphic Display Kit shall include an ergonomic aesthetically pleasing housing a 320x240 dot matrix graphic display and a 230V 120V power supply The Wall Mount Large Graphic Display shall be used to allow remote location of a System View display and all features of the Large Graphic User Service and Advanced menus for use with Liebert iCOM controlled products connected for Unit to Unit U2U communications vNSA Network Switch The vNSA n
7. removable from the front of the unit Immersed Electrode Humidifier Humidification shall be provided by boiling water in a high temperature polypropylene steam generator The humidifier shall have an efficiency of not less than 1 3 kg kVV and be fitted with an auto flush cycle activated on demand from the microprocessor control system The humidifier shall be fully serviceable with replaceable electrodes Waste water shall be flushed from the humidifier by the initiation of the water supply solenoid water valve via a U pipe overflow system Drain solenoid valves will not be used The humidifier shall be approved for direct connection to potable water supplies in accordance with ATS 5200 101 and carry the WaterMark label Humidifier steam nozzles shall be readily accessible for inspection and cleaning in accordance with AS NZS 3666 2 2002 Cl 2 3 3 1 ELECTRIC HEATING Electric heating shall be provided in a single stage The elements shall be of low watt density and high temperature painted steel fin tubular construction protected by thermal safety switches The heating system shall include dual safety protection through loss of air and manual reset high temperature controls in accordance with AS NZS 3102 2002 Cl 7 3 amp Liebert Technical Data Manual 08 08 4 Guide Specifications PEX Small Frame Optional 2nd Stage Electric Heating Electric heating shall be provided in two equal stages The elements shall be of low watt density and high
8. that isolation and balancing valves are installed on supply return lines external to each unit All pipework should be insulated to prevent condensation occurring Care should be taken when installing pipework underfloor so as to minimise air flow resistance Pipework should be horizontally mounted as opposed to stacking and routed parallel to floor discharge unit air paths Refer to 051539 User manual for further information Humidifier Drain A water supply and drain connection is required for each unit Drain lines should be copper and comply with local building codes Refer to 051539 User manual for further information 5 2 Technical Data Manual 08 08 Liebert PEX Small Frame Installation Guidelines Unit Dimensions amp Service Access 550 a 850 a PEX Small Frame Downflow Unit Type F FOR RAISED FLOOR APPLICATIONS Model Width Bays FA W FC L mm oo ois e2 Tos en af 2040 1662 FLOORSTAND Optional Liebert Technical Data Manual 08 08 5 3 Installation Guidelines Unit Dimensions amp Service Access PEX Small Frame a 850 a PEX Small Frame Upflow Unit Type U wee La Moa J Wider aS Uaw L mm foo os a 5 4 Technical Data Manual 08 08 Height adjustable pedestal a FLOORSTAND Optional W Liebert PEX Small Frame Installation Guidelines This page intentionally left blank Liebert Technical Data Manual 08 08 5
9. water pressure The actuator valve combination shall have a maximum closeoff pressure of _ bar ____ psig The iCOM control opens closes the valve in response to room conditions For dehumidification the valve is opened to establish maximum moisture removal and operate its reheat to support space temperature 2 Way Chilled Water Control Valve Modulating Type The water circuit for model P2040FC shall include 2 way modulating control valve The valve body shall be designed for up to 20 bar 300 psig water pressure The actuator valve combination shall have a maximum closeoff pressure of ___ bar ____ psig The iCOM control positions the valve in response to room conditions Cooling capacity will be controlled by modulating the control valve The modulating valve travel for dehumidification shall be proportional Optional 3 Way Chilled Water Control Valve On Off Type The water circuit shall include 3 way on off type spring return control valve The valve body shall be designed for up to 20 bar 300 psig water pressure The actuator valve combination shall have a maximum closeoff pressure of ____ bar ___ psig The microprocessor positions the valves in response to room conditions Cooling capacity will be controlled by bypassing chilled water around the coil The modulating valve travel for dehumidification shall be proportional amp Liebert Technical Data Manual 08 08 4 3 Guide Specifications PEX Small Frame Optional 3 Way Chilled Wa
10. 3 3 Total kW 32 7 43 1 BTUH 111 600 147 100 Sensible kW 12 3 23 0 31 0 37 1 Flow I s 1 42 1 87 GPM 22 5 29 6 Pressure Drop kPa 97 133 ft H O 32 5 44 6 24 C DB 17 1 C WB 75 2 F DB 62 8 F WB 50 RH Upflow Units Based on 7 C 44 6 F EWT 12 5 C 54 5 F LWT Total kW 11 3 25 7 34 6 Sensible kW 9 8 21 2 28 2 Flow I s 0 50 1 12 GPM 7 9 17 8 23 8 Pressure Drop kPa 38 112 108 24 C DB 16 3 C WB 75 2 F DB 61 3 F WB 45 RH Based on 7 C 44 6 F EWT 12 5 C 54 5 F LWT Total kW BTUH 30 8 105 100 Sensible kW BTUH Flow l s 0 50 Pressure Drop kPa 38 ft HO 12 7 28 7 97 900 0 99 1 34 2 30 2 29 1 Evaporator Fan Forward curve centrifugal fan induction motor self tensioning belt drive No of fan assemblies 1 10 10 2 Static Regain duct Std Motor kw HP Downflow Airflow l s 1 175 CFM 1 830 2 3 Technical Data Manual 08 08 Downflow units 0 75 1 0 3 990 4 990 4 990 1 720 2 120 3 650 4 500 n a W Liebert PEX Small Frame Technical Data PEX Downflow and Upflow Units Chilled Water 50Hz Model ___ Downflow 1015 2020 2030 2040 Size Upflow 1015 2020 2030 NA Evaporator Coil Copper tubes louvred aluminium fins Fin series FPM 551 551 512 512 FPI 14 14 13 13 Chilled Water Valve 2 Way Valve Action Size mm in 19 3 4 25 1 25 1 32 1 1 4 Control Port K
11. 43 78 PD kPa 16 14 ft H2O 5 4 4 7 F a Unit Connections Hoo e see o e ay e e Liquid oj e M e Me if ay a l o o T E J me oa r o n S M a Return O D z ayj 1 IE Hum Drain O D E 1 T 1 is Hum Supply BSP 1 2 1 2 7a a Unit Dimensions amp Weight Weight 70 0 a Ibs 374 396 a 594 Unit Footprint Unit only m ft Incl Service area m ft Serv Access mm in 850 33 5 front only NOTES 1 All capacities are nominal values Gross capacity based on 25Pa 0 1 H20 ESP 0m a s l For net capacities deduct fan input power Refer Liebert Rating Program for specific input conditions 2 Input power supply 15 FLA excludes heat rejection equipment Refer IOM for electrical data on optional equipment 3 Standard pressure water regulating valve WRV 1 000 kPa Optional 2 way high pressure WRV 2 400 kPa available 4 Nominal flow amp pressure drop figures are for total unit Based upon 24 CDB 50 RH 30 C EWT amp 35 5 C LWT R22 refrigerant Technical Data PEX Small Frame PEX Downflow and Upflow Units Chilled Water 50Hz Model Downflow 1015 2020 2030 2040 size Upfowl 1015 2020 2030 na Rated Unit Performance Downflow Units 24 C DB 17 1 C WB 75 2 F DB 62 8 F WB 50 RH Based on 7 C 44 6 F EWT 12 5 C 54 5 F LWT Total kW 13 2 27 1 36 8 48 4 BTUH 45 000 92 500 125 600 165 100 i 30 4 36 6 103 700 124 900 1 60 2 10 25 4 3
12. 5 Ensuring The High Availability Of Mission Critical Data And Applications errr Emerson Network Power the global leader in enabling business critical continuity ensures network resiliency and adaptability through a family of technologies including Liebert power and cooling technologies that protect and support business critical systems Liebert solutions employ an adaptive architecture that responds to changes in criticality density and capacity Enterprises benefit from greater IT system availability operational flexibility and reduced capital equipment and operating costs While every precaution has been taken to ensure the accuracy and completeness of this literature Emerson assumes no responsibility and disclaims all liability for damages resulting from the use of this information or for any errors or omissions 2008 Emerson Electric Co All rights reserved throughout the world Specifications subject to change without notice Liebert and the Liebert logo are registered trademarks of Emerson Electric All names referred to are trademarks or registered trademarks of their respective owners 051538_Rev 0_0808 Emerson Network Power The global leader enabling in Business Critical Continuity emersonnetworkpower com E ACPower Systems E Embedded Computing E Outside Plant Services Connectivity E Embedded Power E Power Switching and Controls W Site Monitoring E DCPower Systems E Integrated Cabinet Solutions E Pr
13. A programmable common alarm shall be provided to interface user selected alarms with a remote alarm device Remote Monitoring All alarms shall be communicated to the Liebert monitoring system with the following information Date and time of occurrence unit number and present temperature and humidity Sensor Calibration Menu shall allow unit sensors to be calibrated with external sensors 4 6 Technical Data Manual 08 08 W Liebert PEX Small Frame Guide Specifications Maintenance Wellness Settings Menu shall allow reporting of potential component problems before they occur Options Setup Menu shall provide operation settings for the installed components System Network Setup Menu shall allow Unit to Unit U2U communication and setup for teamwork modes of operation up to 32 units Teamwork Modes of Operation Saves energy by preventing operation of units in opposite modes multiple units Auxiliary Boards Menu shall allow setup of optional expansion boards Diagnostics Service Mode Control input and output values and status shall be displayed to aid in unit diagnostics and troubleshooting Control inputs shall be indicated as on or off at the front display Control outputs shall be able to be turned on or off from the front display without using jumpers or a service terminal Each control output shall be indicated by an LED on a circuit board Advanced Menus Factory Settings Configuration settings shall be factory set based on the
14. C 2 2 2 5 3 0 3 5 3 0 3 5 10 11 6 Close Off kPa psig Humidifier Immersed Electrode Cleanable Capacity kg h Ib hr Input power kW 2 5 3 3 3 3 3 3 Reheat Single stage low watt density fin tubular electric elements Capacity kw 6 6e 9 J 9 6 9 9 Opt 2nd stage kW 6 Filter Dry media disposable G4 to AS NZS1324 1 MERV 8 to ASHRAE 52 2 Downflow mm in 760x460x100 30x18x4 Qty 1 2 2 2 Upflow mm in 650x590x75 25 5x23x3 aty Full Load Current 400 Volts 3 phase N E 50 Hz Supply Standard Unit Amps 15 6 16 3 19 8 19 8 Unit Connections 3 4 BSP 1 BSP 1 BSP 1 3 8 O D Return 3 4 O D 1 O D 1 O D 1 3 8 O D Hum Supply BS Unit Dimensions amp Weight in 33 65 65 65 Depth mm 550 550 550 550 Height mm 1950 1950 1950 1950 Weight kg 130 200 200 230 lbs 286 440 440 506 Unit Footprint Unit only m ft Incl Service area m ft Serv Access mm in 850 33 5 front only NOTES 1 All capacities are nominal values Gross capacity based on 25Pa 0 1 H20 ESP 0m a s l For net capacities deduct fan input power Refer Liebert Rating Program for specific input 2 Standard pressure chilled water valve body rating 2 068 kPa 300 psig Optional 3 way available 3 Input power supply 15 FLA based on humidifier lockout during reheat operation Refer IOM for electrical data on optional equipme
15. Control which uses fuzzy logic and expert systems methods Proportional and Tunable PID shall also be user selectable options Internal unit component control shall include the following Compressor Short Cycle Control Prevents compressor short cycling and needless compressor wear System Auto Restart The auto restart feature will automatically restart the system after a power failure Time delay is programmable Sequential Load Activation On initial startup or restart after power failure each operational load is sequenced with a minimum of one second delay to minimize total inrush current Predictive Humidity Control Calculates the moisture content in the room and prevents unnecessary humidification and dehumidification cycles by responding to changes in dew point temperature The iCOM control shall be compatible with all Liebert remote monitoring and control devices Options are available for BMS interface via MODbus BACNet and SNMP The iCOM control processor shall be microprocessor based with a 128x64 dot matrix graphic front monitor display and control keys for user inputs mounted in an ergonomic aesthetically pleasing housing The controls shall be menu driven The display amp housing shall be viewable while the unit panels are open or closed The display shall be organized into three main sections User Menus Service Menus and Advanced Menus The system shall display user menus for active alarms event log graphic data unit view stat
16. E Precision Cooling For Business Critical Continuity Liebert PEX Technical Data Manual Small Frame 4 a A A E a S b l a 4 EMERSON Network Power Contents Design Mitt OG OD 6 Asincinienducandearsainnnmuneian Features and Benefits 0 0 esesssssceceseeeeeeseeeeees l 2 Model Designation ssesssessssessessersssseesressessessees l 5 Technical Data 50Hz Air Water Cooled sss sssesssssssesssssesssesssessseesseessee 2 1 Chilled Water sazccs cee cwizczetedenicisteantecestenceaineasasentands 2 3 ICOM Control System ou eeeeeeeeeteeeeeee 3 1 Guide Specifications eseeeeseeeeseeresreresrresreres 4 1 Installation Guidelines 00 eects 5 1 Unit DIMENSIONS asssisssisssisssivecsisesisisivesisnsisistsssisestses 5 3 QY Liebert Technical Data Manual 08 08 i PEX Small Frame Design Introduction The Liebert PEX is the next generation precision air conditioning system from Emerson Network Power The PEX is the latest in a long line of advanced products from the Liebert family designed to support business critical applications Sensitive electronics must be maintained in a stable environment of 20 C to 25 C 68 F to 77 F with a relative humidity of 40 to 55 Precision air conditioning systems must not only keep room conditions within this range they must have the precision to react quickly to a drastic change in heat load and prevent wide temperature fluctuation
17. a plate heat exchanger water regulating valve and pipework for each refrigeration circuit complete with refrigerant holding charge Balancing and isolation valves shall be field supplied and fitted by others A strainer with Imm mesh 20 must be installed on the supply side of each water circuit by the contractor Water Cooled Condenser 2 Way Regulating Valve The water cooled condenser heat exchanger shall be of the high efficiency counterflow stainless steel brazed plate type rated for 3000 kPa 435 psig maximum working pressure Water flow shall be controlled by a 2 way factory fitted pressure actuated water regulating valve rated for 1000 kPa 145 psig maximum working pressure Water glycol requirements for the unit shall be _____ l s USGPM of ____ C F entering water based ona____ K F rise and produce a maximum pressure drop of 150 kPa 50 ft of water Optional 2 Way Condenser Water Regulating Valve High Pressure An optional 2 way high pressure water regulating valve rated for 2400 kPa 350 psig pressure shall be fitted CHILLED WATER SYSTEMS The indoor evaporator unit shall include a chilled water cooling coil control valve and on off motorised actuator Balancing and isolation valves shall be field supplied and fitted by others 2 Way Chilled Water Control Valve On Off Type The water circuit shall include 2 way on off type spring return control valve The valve body shall be designed for up to 20 bar 300 psig
18. der from the following choices Group l English French Italian Spanish German Group 2 English Russian Greek Group 3 English Japanese Chinese Arabic Service Contacts Menu shall allow display of local service contact details Service Menus Shall be Defined as Follows Setpoints Menu shall allow setpoints within the following ranges e Temperature Setpoint 8 29 C 65 85 F e Temperature Sensitivity 0 6 5 6 C 1 10 F e Humidity Setpoint 20 80 RH e Humidity Sensitivity 1 30 RH e High Temperature Alarm 2 32 C 35 90 F e Low Temperature Alarm 2 32 C 35 90 F e High Humidity Alarm 15 85 RH e Low Humidity Alarm 15 85 RH The microprocessor may be set within these ranges however the unit may not be able to control to extreme combinations of temperature and humidity Standby Settings Lead Lag Menu shall allow planned rotation or emergency rotation of operating and standby units Timers Sleep Mode Menu shall allow various customer settings for turning on off unit Alarm Setup Menu shall allow customer settings for alarm notification audible local remote The following alarms shall be available e High Temperature Low Temperature High Humidity Low Humidity e Compressor Overload Optional Main Fan Overload Optional Humidifier Problem High Head Pressure Change Filter Fan Failure Low Suction Pressure Unit Off Audible Alarm The audible alarm shall annunciate any alarm that is enabled by the operator Common Alarm
19. ecision Cooling E Surge amp Signal Protection Emerson Network Power and the Emerson Network Power logo are trademarks and service marks of Emerson Electric Co 2007
20. elligent Communications and Monitoring The Liebert iCOM control system offers the highest capabilities of unit control communication and monitoring of Liebert mission critical cooling units Liebert iCOM provides advanced diagnostic and maintenance support enabling multiple units to communicate and work together as a team to precisely control temperature and humidity across a room In addition the iCOM network provides a choice of Teamwork Lead Lag and Cascade functions Control Di I E i Le 1 1 Operating 1 Operating I i A UNBALANCED LOAD NO LOAD Standby i Standby EET metas Operating Standby z H ier ON Unit to Unit Configuration Teamwork Mode SlabEvaporator Coils e High efficiency slab heat exchanger design for precise control of cooling and dehumidification e Large face area cooling coil to maximise heat transfer efficiency e Double angle condensate trays ensure correct water drainage and are removeable for service High Sensible Heat Ratio SHR e All models operate high sensible heat ratios to match the low latent loads of modern computer rooms and telephone exchanges etc e With low latent capacity little moisture is removed from the air so that humidity levels can be maintained without extra humidification thereby ensuring lower energy consumption High Constant Airflow e High airflow achieves favourable sensible heat ratios and provides maximum air change rate to ensure variations in room load are q
21. etwork switch is designed to connect multiple iCOM equipped cooling units to form a network and allow the units to communicate and function as a team Available with or without a Large Graphics Display the vNSA can support up to 14 Small Graphics Display units Supplied in a wall mount enclosure with key lock Requires 00 240VAC single phase power OY Liebert Technical Data Manual 08 08 4 7 Guide Specifications PEX Small Frame IntelliSlot WEB Card The Liebert IntelliSlot Web card provides HTTP browsing SNMP and WEB management capability of Liebert PEX units within your Network Management System NMS IntelliSlot 485 Card The Liebert IntelliSlot 485 card provides BMS management of Liebert PEX units over EIA 485 via Modbus RTU or Liebert s proprietary protocol for SiteLink connectivity iCOM Ethernet Cable Certified CAT5e patch cable with fully moulded ends used for connecting an iCOM to a network switch Available in lengths of 10 15 20 30 and 45 metres 33 50 65 100 and 150 feet Bulk cable is also available in 305 metre 1000 feet rolls iCOM Ethernet Crossover Cable Certified CAT5e crossover cable with fully moulded ends for networking 2 Small Graphics Display iCOM units together are available in lengths of 10 20 and 30 metres 33 65 amp 100 feet Remote Air Cooled Condenser Power Kit A 10 amp rated single pole circuit breaker and contactor shall be provided in the electrical panel for field connection to power the remo
22. ional Large Graphic Display features a 320x240 dot matrix backlit screen with helpful system and maintenance views SPORES lt INIT o gt QTY CODE Unit Diary Teamwork Mode 2 Units work together to provide precision cooling in rooms with unbalanced loads Control Disables Humidifier ON Humidifier ON Dehumidification UNBALANCED LOAD NO LOAD Humidifier ON Note Field supplied network switch required for unit to unit communications Refer 051536 iCOM User manual for further information on iCOM features and operation 3 2 Technical Data Manual 08 08 W Liebert PEX Small Frame Guide Specifications GENERAL Summary These specifications describe requirements for a Mission Critical Cooling system The system shall be designed to control temperature and humidity conditions in rooms containing electronic equipment with good insulation and vapour barrier The manufacturer shall design and furnish all equipment to be fully compatible with heat dissipation requirements of the room PRODUCT Design Requirements The Mission Critical Cooling system shall be a Liebert PEX model self contained factory assembled unit with upflow downflow air delivery The system shall have a total cooling capacity of kW with a sensible cooling capacity of kW based on an entering air temperature of C dry bulband_ C wet bulb The unit is to be supplied with ____ volt___ ph ____Hz electrical service and include a rating name
23. lean and away from trees loose dirt and building exhausts Please refer to the air cooled condenser technical data manual for more information including dimensions weights and connection sizes Water Cooled Systems The PEX water cooled unit is shipped with a factory charged refrigeration system of either R22 or R407C and includes a brazed plate stainless steel plate heat exchanger and 2 way water regulating control valve per circuit In addition the following services are required to make the system operational e electrical supply to the indoor unit e condenser water supply e humidifier drain e humidifier water supply Water Cooled Piping A strainer with a Imm mesh 20 and isolation valves on either side must be fitted to the condenser water supply for each unit A balancing valve is also recommended for each circuit as a minimum to provide adjustment of condenser water flow rates Refer to 051539 User manual for further information Chilled Water Systems The PEX chilled water unit is shipped with factory installed water control valves and piping for direct connection to the building system chilled water loop In addition the following services are required to make the system operational e electrical supply to the indoor unit e chilled water supply e humidifier drain e humidifier water supply Chilled Water Piping There is a single connection for the chilled water supply in and chilled water return out pipes It is recommended
24. material to prevent electrolytic corrosion The evaporator drain tray shall incorporate double sloped gutters for complete condensate removal and shall be removeable for cleaning in accordance with AS NZS 3666 1 2002 Cl 2 8 1 The cooling coil shall be a maximum of 5 rows and 551 fins per metre 14 FPI and the face velocity shall not be more than 2 5 m s 500 fpm Dehumidification A specific dehumidification cycle split suction shall operate by reducing the operating surface temperature in a section of the refrigeration coil by means of a solenoid valve on the suction header Room loads as low as 50 of the unit sensible cooling capacity shall be supported during dehumidification without the need for larger capacity or additional heating stages Full airflow of the unit will be maintained at all times to ensure consistent air distribution to the conditioned space Air Cooled Systems The indoor evaporator unit shall include refrigerant piping with a factory holding charge of nitrogen The refrigeration circuit shall include rigidly mounted isolation valves in the discharge and liquid lines to aid servicing and installation Remote Air Cooled Condenser The model air cooled condenser shall be the low profile weatherproof type incorporating high efficiency direct drive external rotor motors with axial blade fans The condenser shall balance the heat rejection of the compressor at___ C ambient The condenser shall be constructed from heavy duty
25. nstallation To achieve design performance and maximum product life correct installation is vital The following information relates specifically to our products and should be applied in conjunction with prevailing industry standards for mechanical and electrical installations For more detailed information on installing Liebert PEX systems please refer to the PEX User manual Air Cooled Systems The PEX air cooled unit is shipped with a factory holding charge of nitrogen Each circuit is supplied with quarter turn isolation valves on the liquid and discharge lines to facilitate installation and servicing The refrigerant piping must be connected in the field to a matched air cooled condenser and then pressure tested dehydrated and charged with either R22 or R407C refrigerant In addition the following services are required to make the system operational e electrical supply to the indoor unit e electrical supply to the air cooled condenser e humidifier drain e humidifier water supply Refrigeration Piping All refrigeration piping joints must be high temperature silver brazed Avoid using solders containing hazardous substances Any applicable local codes relating to fire safety in terms of pressure relief must be observed Standard industry procedures must be followed for selection and placement of pipe supports system evacuation oil addition and charging with refrigerant Consideration must be given to pipeline pressure drop oil return to the c
26. nt Technical Data PEX Small Frame This page intentionally left blank 2 5 Technical Data Manual 08 08 amp Liebert PEX Small Frame iCOM Control The Liebert iCOM control system featured on the Liebert PEX brings high level supervision to multiple units allowing them to work together as a single system to optimise room performance The Liebert COM control system offers a variety of advantages Removable display makes troubleshooting servicing easier Parts list available on control for easier maintenance The standard Small Graphic Display features a 128x64 dot matrix backlit screen Advanced monitoring can be achieved with the addition of the Optional Wall Mounted Display Intelligent Communications and Monitoring e Saves Energy using Predictive Humidity Control e Built in Lead Lag Functions for enhanced system reliability e Wellness Calculation alerts service personnel before problems occur e Unit to Unit U2U Communications allows Lead Lag and optional teamwork settings for maximum flexibility and control e Optional IntelliSlot cards offer external monitoring through Modbus RTU and HTTP SNMP protocols Monitors all key system functions and reports to alarm if needed The optional Wall Mounted Large Graphic Display provides centralised monitoring and control of connected Liebert On board Unit Diary provides a PEX units maintenance history to any authorized user The Liebert IntelliSlot Web and
27. ompressor avoidance of oil logging in parts of the system and minimisation of noise and vibration Pipe sizing tables are provided in 05 539 User manual for each model and are for equivalent lengths which include an allowance for bends They are suggestions only and it is the installer s responsibility to confirm that sizes are appropriate for site conditions Note An optional long line pipe kit comprising a liquid line shutoff valve and non return valve is required for equivalent lengths in excess of 30 metres Consult the factory whenever the equivalent length exceeds 60m or if the vertical separations exceed those shown Condenser Located Above PEX Unit Condenser Located Below PEX Unit PEX unit PEX unit discharge 20m max 7 5m max discharge Liebert Technical Data Manual 08 08 5 1 Installation Guidelines PEX Small Frame e Discharge line Discharge lines should be insulated where they are routed in the conditioned space including under a raised floor Traps must be fitted in vertical risers every 7 5 metres and at the base of a riser Slope discharge lines in the direction of refrigerant flow e Liquid line Liquid lines should not be exposed to any heat sources and should be insulated Air cooled condenser location Condensers should be located for maximum security and maintenance accessibility Vertical or horizontal discharge condensers may be used The surrounding area should be c
28. plate stating the unit FLA or kW kVA Cabinet Construction The frame shall be constructed of 2 5 2 0 and 1 2 mm folded galvanised steel The exterior panels shall be constructed of 2 mm zinc coated sheet steel and insulated with foam insulation The cabinet shall be powder coated in Charcoal Grey colour and have a textured finish The front panels shall be removeable and include captive 1 4 turn fasteners The cabinet shall be assembled with pop rivets providing ease of disassembly Filtration The filter panels shall be an integral part of the system and withdrawable from the top downflow front upflow of the unit Filtration shall be provided by deep V form dry disposable media housed in a metal frame The rated efficiency shall be G4 to AS NZS 1324 1 MERV8 to ASHRAE 52 2 Standard Standard FC Fans Direct Expansion and Chilled Water Systems The fan section shall be designed for I s at an external static pressure of Pa The unit shall be fitted with one two direct drive forward curved FC centrifugal type double width double inlet fan s Each fan shall be separately driven by a multi speed high efficiency electric motor They shall be statically and dynamically balanced HUMIDIFIER A humidifier shall be factory installed inside the unit Bypass air shall be used to enable moisture to be absorbed into the airstream without condensation The humidifier capacity shall be kg hr lb hr The humidifier shall be serviceable and
29. s Liebert PEX units are specifically developed for applications requiring close environmental control e Data Centres e Telecom CATV e Computer Rooms e Labs and Test Rooms e Network Centres e Production Facilities s The ASHRAE document Thermal Guidelines for Data Processing Environments spells out the temperature dew point and humidity specifications for electronic components operating in mission critical facilities Types of equipment typically found in these facilities are enterprise servers and storage products 50 Primary precision air 40 conditioning systems keep room temperature and humidity within this area of control Relative Humidity RH 2 Da 10 12 15 18 21 24 27 Dry Bulb Temperature C The PEX Advantage Only the Liebert PEX can give you all these advantages e Comprehensive local support Full pre sales and post sales support is readily available anytime you need it e Customisation expertise PEX units can be customised to suit your requirements with expertise and assistance from local R amp D and Engineering teams e Full Service capability Factory trained Customer Engineers provide backup support 24 x 365 e Established company Emerson Network Power has been designing and manufacturing precision environmental control systems for over 30 years OY Liebert Technical Data Manual 08 08 l 1 Design PEX Small Frame Features and Benefits iCOM Int
30. te factory matched air cooled condensers Long Line Pipe Kit Air Cooled Systems A factory fitted liquid line solenoid valve and field installed non return valve supplied loose shall be provided for the refrigeration circuit to prevent liquid refrigerant migration to the evaporator compressor during off cycles in air cooled installations Note Mandatory for pipe runs in excess of 30 metres Condensate Pump Immersed Electrode Humidifier equipped units The condensate pump shall have a nominal capacity of 1625 I hr 430 USGPH at 3 2 m 10 ft head and be suitable for pumping 100 C 212 F water It shall be complete with integral dual float switches pump and motor assembly and reservoir The secondary float shall send a signal to the local alarm and shut down the unit upon high water condition The pump shall be supplied loose and be field installed external to the unit Reheat Humidifier Lockout Emergency Power Lockout A field supplied 24VAC source to field wiring terminals in the electrical panel will lockout the electric heaters and humidifier Common Alarm Terminals Additional A total of three 3 common alarm terminals normally open rated at 24VAC 3 amps each shall provide remote alarm indication Phase Fault Relay The unit shall shutdown upon detection of a loss of any phase and report an alarm Main Fan Auxiliary Contact Dry contact terminals normally open shall provide remote status indication for the main fan s
31. temperature painted steel fin tubular construction protected by thermal safety switches The heating system shall include dual safety protection through loss of air and manual reset high temperature controls in accordance with AS NZS 3102 2002 Cl 7 3 COMPRESSORISED SYSTEMS Scroll Compressor The compressor shall be of the high efficiency Compliant Scroll design with an E E R energy efficiency ratio of not less than 1 1 BTUH watt C O P of not less than 3 25 at ARI rating conditions The compressor shall be charged with polyolester oil and designed for operation on HCFC R22 or HFC R407C Each compressor shall have internal motor protection and be mounted on vibration isolators Refrigeration Circuit The refrigeration system shall be of the direct expansion type with two cooling stages and incorporate one hermetic scroll compressor complete with crankcase heater A hot gas bypass solenoid valve shall be used to provide 50 or 100 cooling capacity The system shall include a manual reset high pressure control auto reset low pressure switch externally equalised thermal expansion valve high sensitivity refrigerant sight glass large capacity filter drier and charging access ports in each circuit Evaporator Coil The coil shall be constructed of enhanced surface aluminium fins mechanically bonded to copper tubes with the frame and drip tray fabricated from heavy gauge aluminium All metal parts in contact with condensate shall be the same
32. ter Control Valve Modulating Type The water circuit for model P2040FC shall include 3 way modulating control valve The valve body shall be designed for up to 20 bar 300 psig water pressure The actuator valve combination shall have a maximum closeoff pressure of __ bar psig The microprocessor positions the valves in response to room conditions Cooling capacity will be controlled by bypassing chilled water around the coil The modulating valve travel for dehumidification shall be proportional UNIT SIZE Compressorised Systems The maximum footprint area of the unit shall not exceed 0 46 m up to I kW 0 92 m above and up to 21 kW The unit shall require front access only for routine service and installation work Chilled Water Systems The maximum footprint area of the unit shall not exceed 0 46 m up to 13 kW 0 92 m above 13 and up to 48 kW The unit shall require front access only for routine service and installation work 4 4 Technical Data Manual 08 08 W Liebert PEX Small Frame Guide Specifications ALL SYSTEMS Water Under Floor Sensor LWD Each unit shall be supplied with a single water under floor point detector as standard Up to 5 sensors in total may be connected in series from each iCOM cooling unit Any individual sensor shall signal a water under floor alarm to the controller upon detecting water iCOM Microprocessor Control with SMALL Graphic Display The iCOM unit control shall be factory set for Intelligent
33. uickly detected and responded to e Airflow is constant under all operating modes including dehumidification providing even air distribution across the room resulting in optimal temperature and humidity control Footprint amp Serviceability e High kW to footprint ratio e Front accessible for installation and routine servicing e Front doors are removeable offering improved service access to the unit internals l 2 Technical Data Manual 08 08 amp Liebert PEX Small Frame Design Features and Benefits DX Systems Dehumidification Cycle e Compressorised models employ split coil configurations allowing latent cooling capacity to be substantially increased but only as required so that energy consumption is minimised whilst providing close temperature and humidity control Room loads as low as 50 of unit cooling capacity can be supported with standard reheat e Smaller heater size and unit full load amps FLA lowers electrical connection requirements and reduces installation costs Split Coil Dehumidification Direct Drive Fan e Forward curved double width double inlet DWVDI centrifugal fans coupled to high efficiency motors are standard on all models e Insulated static regain ducts in floor discharge models reduce noise turbulence and increase fan efficiency Direct Drive System Electric Heaters e Single stage electric reheat system 2nd stage optional employing low watt density fin tubular elements e Optional Reheat H
34. umidifier lockout reduces power requirements during emergency power operation Dual Refrigerant Offering All compressorised models are designed to operate on either HCFC R22 or HFC R407C refrigerants Choice of Refrigerants W Liebert Technical Data Manual 08i08 1 3 Design PEX Small Frame Features and Benefits Immersed Electrode Humidifier e Direct acting electrodes configurable for wide ranging water quality e Fail safe operation electrodes will not function without water e Water vapour introduced into coil bypass air avoids condensation e Unique overflow flush cycle avoids problems associated with normal dump drain valves e Fully serviceable design ensures quick and cost effective maintenance e Approved for direct connection to potable water supplies Immersed Electrode Humidifier Why is Bypass Air Introduction Important From a psychrometric standpoint return air at 24 C 45 RH has more than 5 times the capacity to absorb steam compared to air at 14 C 80 RH that has already been cooled by the evaporator and is now close to saturation The capacity of this cool air to absorb water vapour is limited and can result in water condensing within the air unit and surrounding areas Bypass air introduction of water vapour is a more efficient method of humidification Moisture g kg Mbyp 14 24 DB Temperature C l 4 Technical Data Manual 08 08 W Liebert PEX Small Frame Design Model Designation 1 2 3 4
35. us overview including the monitoring of room conditions operational status in of each function date and time total run hours various sensors display setup and service contacts A password shall be required to make system changes within the service menus Service menus shall include setpoints standby settings lead lag timers sleep mode alarm setup sensor calibration maintenance wellness settings options setup system network setup auxiliary boards and diagnostics service mode A password shall be required to access the advanced menus User Menus Shall be Defined as Follows Active Alarms Unit memory shall hold the 200 most recent alarms with time and date stamp for each alarm Event Log Unit memory shall hold the 400 most recent events with id number time and date stamp for each event Graphic Data View Two graphic records shall be available return air temperature and return air humidity Unit View Status Overview Simple or Graphical Unit View summary displays shall include temperature and humidity values active functions and percent of operation and any alarms of the host unit Total Run Hours Menu shall display accumulative component operating hours for major components including compressors fan motor humidifier and reheat amp Liebert Technical Data Manual 08 08 4 5 Guide Specifications PEX Small Frame Display Setup Customer shall pre select the desired grouping of display languages at the time of the or
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