Liebert PEX Technical Data Manual - Large Frame
Contents
1. No Modules Bays Fans 1 One 2 3 Three Nominal kW 20 30 40 to 150 Air Path Downflow Forward Curve G Downflow EC Backward Curve Upflow Forward Curve V Upflow EC Backward Curve D Upflow Ducted Forward Curve Cooling Type A Air Cooled W Water Cooled G Glycol Cooled C Chilled Water Cooling Control R 22 scroll 2 compressors R 407C scroll 2 compressors R 22 scroll 1 compressor R 407C scroll 1 compressor 2 way CWV CW zero compressors 3 way CWV CW zero compressors R S P 2 2 3 Voltage 400 3 50 460 3 60 575 3 60 208 3 60 230 3 60 416 3 60 380 3 60 200 3 60 iCOM Displa S Small Graphics Display L Large Graphics Display Reheat Type 0 None 1 1 Stage 2 2 Stage Humidification 0 None R Infrared S Immersed Electrode Factory Configuration Number A Z Options A Z Options A Z Options Liebert Technical Data Manual 08 08 1 7 Technical Data PEX Downflow and Upflow Units PEX Large Frame Air Water Glycol Cooled 50Hz Model Size 1020 1025 1030 1035 2045 2055 2040 2050 2060 2070 3080 3090 3100 24 C DB 17 1 C WB 75 2 F DB 62 8 F WB 50 RH Total KW 20 0 23 1 30 1 3331 4 amp 0 532 410 464 60 6 669 81 4 893 1000 BTUH 68 200 78 800 102 700 112 900 153 500 181 500 12. 25 Optional 5 6 Technical Data Manual 08 08 0 Liebert PEX Large Frame Installation Guidelines Unit Dimensions 8 Service Access PEX Large Frame Upflow Unit Type V FOR DUCTED APPLICATIONS L m n oORSTAND L3 0 Liebert Technical Data Manual 08 08 5 7 Ensuring The High Availability Of Mission Critical Data And Applications Emerson Network Power the global leaderin enabling business critical continuity ensures network resiliency and adaptability through afamily oftechnologies 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 051534 Re
3. Precision Cooling For Business Critical Continuity Liebert PEX Technical Data Manual Large Frame EMERSON Network Power Contents Design Mit OGUC OD ao kk te 1 1 Features and Benefits 1 2 Model Designation ode ep atq 1 7 Technical Data 50Hz Air Water Glycol Cooled 2 1 Chilled VY ACG iioi biis Fete idiotas 2 3 Control 71 9 3 1 Guide Specifications 4 1 Installation Guidelines 5 1 Unit DIMENSIONS cue eii enu s riui 5 3 PEX Large 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 to 25 C 68 F to 77 F with a relative humidity of 4076 to 5576 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 fluctuations Liebert PEX units are specifically developed for applications requiring close environmental control Data Centres Telecom CATV Com
4. The indoor evaporator unit shall include a plate heat exchanger fitted with rotalock connections 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 with Bypass 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 glycol flow shall be controlled by a 2 way factory fitted pressure actuated water regulating valve rated for 1000 kPa 145 psig maximum working pressure A bypass gate valve shall be fitted on larger models to bypass the regulating valve Water glycol requirements for the unit shall be l s USGPM of C F entering water based on a F rise and produce a maximum pressure drop of 150 kPa 50 ft of water Optional 3 Way Condenser Water Regulating Valve High Pressure An optional 3 way high pressure water regulating valve rated for 2400 kPa 350 psig pressure shall be fitted 6 Liebert Technical Data Manual 08 08 4 3 Guide Specifications PEX Large Frame CHILLED WATER SYSTEMS The indoor evaporator unit shall include dual chilled water cooling coils control valves and motorised actuators Th
5. 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 Display Setup Customer shall pre select the desired grouping of display languages at the time of the order from the following choices Group 1 English French Italian Spanish German Group 2 English Russian Greek Group 3 English Japanese Chinese Arabic 6 Liebert Technical Data Manual 08 08 4 5 Guide Specifications PEX Large Frame 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 Temperature Setpoint 18 29 65 85 Temperature Sensitivity 0 6 5 6 C 1 10 Humidity Setpoint 20 80 RH e Humidity Sensitivity 1 30 RH High Temperature Alarm 2 32 C 35 90 F Low Temperature Alarm 2 3
6. The compressor shall be of the high efficiency Compliant Scroll design with an E E R energy efficiency ratio of not less than 11 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 or two hermetic scroll compressors complete with crankcase heaters and rotalock connections A hot gas bypass solenoid valve shall be used on single compressor models 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 with rotalock connections and charging access ports in each circuit Evaporator Coil The evaporator coil shall be a V coil for upflow A coil for downflow incorporating draw through air design for uniform air distribution The coil shall be constructed of enhanced surface aluminium fins mechanically bonded to enhanced surface copper tubes with the frame and drip tray fabricated from heavy gauge aluminium All metal parts in contact with condensate shall be the same material to prevent electrolytic corrosion The evaporator drain tray shall incorporate doub
7. and insulated with foam insulation The cabinet shall be powder coated in Charcoal Grey colour and have a textured finish The hinged 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 front 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 lis at an external static pressure of Pa The unit shall be fitted with one two three belt driven forward curved FC centrifugal type double width double inlet fan s Each fan shall be separately driven by a MEPS compliant for Australia EFFI efficiency electric motor rated at J kWat RPM with an IP55 enclosure rating The drive arrangement shall be self tensioning and provide for belt replacement without the use of tools They shall be statically and dynamically balanced Optional EC Fans Chilled Water Systems The fan section shall be designed for lis at an external static pressure of Pa The unit shall be fitted with one two three direct driven high efficiency single inlet backward curved centrifugal plug type fan s with aluminium nozzle s and impel
8. curve centrifugal fan EC motor direct drive Downflow Units 6 950 14 760 n a of fan assemblies Motor kw HP 2 3 Technical Data Manual 08 08 6 Liebert Large Frame PEX Downflow and Upflow Units Technical Data Chilled Water 50 2 Model Downflow 1020 1030 1040 2050 2070 2090 N A 3110 3140 Size Upilow 1020 1030 N A 2050 2070 N A 3080 3110 Evaporator Coil Copper tubes louvred aluminium fins No of rows 4 4 5 4 4 5 4 4 5 Fin series FPM 551 551 551 551 551 551 551 551 551 14 14 14 14 14 14 14 14 14 Chilled Water Valve 2 Way Ball Valve PN40 Body with Motorised Actuator 2 Action Modulating Size mm DN15x2 DN20x2 DN20x2 DN20x2 DN25x2 DN25x2 DN25x2 DN32x2 DN40x2 Control Port K C 4 46 4 4 6 6 3 7 3 16 18 6 16 18 6 10 11 6 10 11 6 10 11 6 16 18 6 Close Off kPa psig Standard Humidifier Infrared with Autoflush 1380 200 Capacity kg h 4 5 Ib hr 1 0 10 Optional Humidifier Immersed Electrode Cleanable Capacity kg h 4 5 4 5 4 5 Ib hr 10 10 10 3 3 3 3 3 3 Input power kW 9 6 5 6 Downflow mm in Qty Upflow mm in Full Load Current 400 Volts 3 phase N E 50 Hz Supp Unit Connections W 23 5 Supply O D Cu 2 2 2 Return O D 1
9. precision cooling in rooms with unbalanced loads Control Disables Dehumidification Humidifier ON Humidifier ON 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 Liebert Large 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 Cdrybulband ____ C wet bulb The unit is to be supplied with volt ph Hz electrical service and include a rating nameplate 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 1 2 mm zinc coated sheet steel
10. up to 70 kW 2 25 m above 70 and up to 100 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 75 m up to 45 kW 1 50 m above 45 and up to 95 kW 2 25 m above 95 and up to 150 kW The unit shall require front access only for routine service and installation work 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 4 4 Technical Data Manual 08 08 0 Liebert Large Frame Guide Specifications iCOM Microprocessor Control with SMALL Graphic Display The iCOM unit control shall be factory set for Intelligent 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
11. 1 4 1 1 4 1 1 4 1 5 8 1 5 8 1 5 8 2 2 2 IE Hum Drain O D 25 25 25 25 25 25 25 25 25 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 3 4 1 2 1 2 1 2 IR Hum Drain FPT Hum Supply BSP Unit Dimensions 8 Weight 1 2 1 2 1 2 1 2 1 2 1 2 Ibs 572 572 594 1056 1056 1100 1606 1606 1672 Unit Footprint Unit only m 1 49 16 0 1 49 16 0 1 49 16 0 2 23 24 0 2 23 24 0 Incl Service area m ft 2 94 2 94 2 94 31 6 31 6 31 6 4 40 47 4 4 40 47 4 Serv Access mm in NOTES 850 33 5 front only 1 capacities are nominal values Gross capacity based on 25Pa 0 1 H20 ESP Downflow Upflow 25Pa 0 1 H20 ESP Upflow Ducted 100Pa 0 4 H20 ESP Om a s l For net capacities deduct fan input power Refer Liebert Rating Program for specific input conditions 2 Standard pressure chilled water valve body rating PN40 4 000 kPa Optional 3 way available 3 Input power supply 15 FLA based on standard evaporator fan and humidifier lockout during reheat operation Refer IOM for electrical data on optional equipment Liebert Technical Data Manual 08 08 2 4 Technical PEX Large Frame This page intentionally left blank 2 9 Technical Data Manual 08 08 l Liebert PEX Large Frame iCOM Control The Liebert control system featured on the Liebert PEX brings high level supervision to multiple units allo
12. 2 55 1 59 7 73 5 82 2 89 9 BTUH 65 200 74 000 93 500 102 000 145 400 166 500 134 800 150 800 188 000 203 700 250 800 280 500 306 700 Standard Evaporator Fan Forward curve centrifugal fan induction motor self tension 12 12 Downflow Units ing belt drive Po oo pO DOWntlOw Units Static Regain duct Std Motor kw HP 2 2 3 0 Opt Motor kw HP 3 0 4 0 Downflow Airflow I s 1 575 1 850 2 300 2 275 3 400 3 800 3 050 3 600 4 500 4 450 5 600 6 650 6 600 CFM 3 340 3 930 4 880 4 830 7 220 8 070 6 480 7 640 9 550 9 450 11 890 14 120 14 010 Upflow Airflow I s 1 500 1 750 2 185 2 200 3 225 3 620 2 900 3 400 4 275 4 300 5 330 6 325 6 350 CFM 3 180 3 720 4 640 4 670 6 850 7 690 6 160 7 220 9 080 9 130 11 320 13 430 13 480 Optional Evaporator Fan Backward curve centrifugal fan EC motor direct drive Size 560 PB Motor kw HP Evaporator Coil Copper tubes with rifled b 2 3 3 1 ore tubes louvred aluminium fins 512 13 512 13 Compressor Copeland Compliant Scroll w ith Crankcase Heater No of compressors 1 1 1 1 1 1 2 2 2 Unit cooling steps 2 2 2 2 2 2 2 2 2 Safety controls kPa psig Standard Humidifier Infrared with Autoflush 4 5 10 4 8 Capacity kg h 4 5 4 5 lb hr 10 10 Input power kW
13. 2 C 35 90 F High Humidity Alarm 15 8576 RH Low Humidity Alarm 15 8576 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 High Temperature Low Temperature High Humidity Low Humidity 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 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 Maintenance Wellness Settings Menu shall allow reporting of potential component problems before they occur Options Setup Menu shall provide operation settings for the installed co
14. 39 900 158 300 206 800 228 300 277 700 304 700 341 200 Sensible kW 18 9 21 5 266 294 417 473 385 43 2 53 4 59 0 71 3 797 88 4 BTUH 64 500 73 400 90 800 100 300 142 300 161 400 131 400 147 400 182 200 201 300 243 300 271 900 301 600 24 C DB 16 3 C WB 75 2 DB 61 3 F WB 45 RH Total kW 20 0 22 6 28 7 31 8 44 7 51 6 41 1 45 9 57 9 64 6 78 4 85 2 98 0 BTUH 68 200 77 100 97 900 108 500 152 500 176 100 140 200 156 600 197 600 220 400 267 500 290 700 334 400 Sensible kW 19 8 22 4 28 1 31 2 44 4 50 4 40 7 455 56 6 62 7 75 5 84 2 94 5 BTUH 67 600 76 400 95 900 106 500 151 500 172 000 138 900 155 200 193 100 213 900 257 600 287 300 322 400 Rated Unit Performance R 22 and R 407C Upflow Units 24 DB 17 1 C WB 75 2 F DB 62 8 F WB 50 RH Total kW 19 4 32 4 44 4 65 9 BTUH 66 200 75 400 99 600 110 500 151 500 177 400 134 800 155 900 197 600 224 900 Sensible kW 28 0 40 7 56 3 BTUH 62 400 70 600 88 400 95 500 138 900 157 300 126 900 143 300 176 100 192 100 24 C DB 16 3 C WB 75 2 F DB 61 3 F WB 45 RH Total kW 19 3 21 9 28 1 31 8 43 0 49 7 39 8 44 5 56 5 63 5 76 7 83 5 96 6 BTUH 65 900 74 700 95 900 108 500 146 700 169 600 135 800 151 800 192 800 216 700 261 700 284 900 329 600 Sensible kW 19 1 21 7 27 4 29 9 42 6 48 8 39 5 44
15. 4 8 4 8 4 5 10 4 8 10 22 10 22 10 10 10 22 22 22 9 6 LP cutout in auto reset 140 420 HP cutout manual reset 2800 LP cutout in auto reset 20 60 HP cutout manual reset 400 10 22 9 6 10 10 22 22 9 6 9 6 10 22 10 10 22 22 2 1 Technical Data Manual 08 08 Liebert PEX Large Frame Technical Data PEX Downflow and Upflow Units Air Water Glycol Cooled 50Hz Model Size 1020 1025 1030 1035 2045 2055 2040 2050 2060 2070 3080 3090 3100 Reheat Single stage low watt density 304 Stainless Steel fin tubular electric elements Cepady KW 6 6 6 6 10 to 6 6 10 to 10 10 Opt 2ndstage kW 6 e 6 e 10 to 6 6 10 to 10 10 Filter Dry media disposable G4 to AS NZS1324 1 MERV 8 to ASHRAE 52 2 Downflow mm in 785x785x100 31x31x4 nominal Qty Upflow mm in Qty va Size 1 1 1 047 1 1 4 1 174 4 1 4 1 1 1 4 1 1 4 1 1 4 1 1 4 1 1 4 GPM 17 0 195 254 284 380 457 346 390 510 568 688 755 872 PD kPal 65 54 52 46 71 78 38 52 60 46 71 EE 23 1 30 0 34 1 450 541 40 9 463 60 6 67 2 81 5 89 4 103 4 PD kPal 82 59 eo 58 71 75 40 57 73 57 73 69 Unit Connections Hot Gas O D 5 8 7 8 Liquid O D a G ae 5 8 5 8 5 8 5 8 5 8 5 8 5
16. 4 800 218 400 255 200 329 900 388 600 Flow 1 5 1 10 1 37 1 76 2 35 2 95 3 79 4 48 5 85 GPM 17 4 21 7 27 9 37 3 46 8 60 1 71 0 92 7 Pressure Drop kPa 50 76 67 52 79 116 83 152 ft H O 16 8 25 5 22 4 17 4 26 5 38 9 27 8 50 9 24 17 1 WB 75 2 62 8 WB 50 RH Upflow Units Based on 7 C 44 6 EWT 12 5 C 54 5 F Total kW 27 8 35 1 59 2 74 8 89 3 113 5 BTUH 94 900 119 800 202 000 255 200 304 700 387 300 BTUH 76 100 100 300 156 600 207 400 236 800 313 600 n a n a 3 88 4 93 64 99 21 4 33 2 Flow 1 5 1 21 PM 19 2 Pressure Drop kPa 59 24 DB 16 3 C WB 75 2 DB 61 3 WB 45 RH Based on 7 C 44 6 F EWT 12 5 C 54 5 F LWT Total kW 24 6 30 9 52 5 66 5 BTUH 83 900 105 400 179 100 226 900 Sensible kW 22 6 BTUH 77 100 101 0 344 600 93 5 319 000 79 5 70 2 239 500 30 0 46 5 61 9 102 400 158 700 211 200 n a Flow 1 5 1 07 3 45 4 38 GPM 69 4 Pressure Drop kPa 80 ft 26 8 Standard Evaporator Fan Forward curve centrifugal fan induction motor self tensioning belt drive Size No of fan assemblies Static Regain duct Std Motor kw HP 2 2 3 0 Opt Motor kw H 3 0 4 0 HP CFM 3 450 4 880 4 880 6 850 9 870 9 870 n a 14 760 CFM 3 290 4 780 n a 6 530 9 450 n a 9 770 14 120 Optional Evaporator Fan Backward
17. 8 0 3 32388 Supply 1 0 1 1 8 1 1 8 1 3 8 1 3 8 1 3 8 1 1 4 1 1 4 Return 02 2 25 3 4 BSP 1 2 1 2 1 2 1 2 12 1 2 1 2 1 2 1 2 1 2 1 2 1 2 1 2 Unit Dimensions amp Weight Width mm 853 853 853 853 1704 1704 2553 Depth mm 874 874 874 874 874 874 874 874 874 Height mm 1970 1970 1970 1970 1970 1970 Weight kg 320 330 340 350 560 570 590 610 640 650 910 930 950 lbs 704 726 748 770 1232 1254 1298 1342 1408 1430 2002 2046 2090 Unit Footprint it 8 0 8 0 8 0 8 0 16 0 16 0 16 0 16 0 16 0 16 0 24 0 24 0 24 0 Incl Service area m 1 47 1 47 1 47 1 47 2 94 2 94 2 94 2 94 2 94 2 94 4 40 4 40 4 40 Serv Access mm in 850 33 5 front only NOTES 1 All capacities are nominal values Gross capacity based on 45 C 113 mid point condensing temperature Downflow Upflow 25 0 1 H20 ESP Upflow Ducted 100Pa 0 4 H20 ESP Om a s l For net capacities deduct fan input power Refer Liebert Rating Program for specific input conditions Refer to the Air Cooled Condenser technical manual for condenser selections 2 Input power supply 15 FLA excludes heat rejection equipment Refer IOM for electrical data on optional
18. EC Direct Drive Option Optional EC Direct Drive Fan Chilled Water Systems In addition to the above downflow chilled water units feature an in floor fan configuration to deliver the ultimate in energy efficiency Fans are easily lowered into the floor after unit positioning on site _ M lt Unique In Floor Fan Configuration 1 4 Technical Data Manual 08 08 0 Liebert PEX Large Frame Design Features and Benefits Humidifier options Infrared humidification is standard on all Large Frame PEX models Immersed electrode bottle humidification is available as an option Infrared Humidifier Instant humidification high intensity quartz infrared lamps provide fast responsive energy efficient humidification Full capacity achieved in 5 6 seconds using almost any water quality Particle free water vapour introduced into coil bypass air avoids condensation Autoflush cycle helps remove mineral deposits Cleanable stainless steel humidifier pan Approved for direct connection to potable water supplies Bypass Grams of Air pure Flow e Q e moisture Infrared Humidifier Operation Immersed Electrode Humidifier Direct acting electrodes configurable for wide ranging water quality Fail safe operation electrodes will not function without water Water vapour introduced into coil bypass air avoids condensation e Unique overflow flush cycle avoids problems associated
19. ble heat ratios and provides maximum air change rate to ensure variations in room load are quickly detected and responded to Airflow is constant under all operating modes including dehumidification providing even air distribution across the room resulting in optimal temperature and humidity control l 2 Technical Data Manual 08 08 0 Liebert PEX Large Frame Design Features and Benefits DX Systems Dehumidification Cycle 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 2576 of unit cooling capacity can be supported with standard reheat Smaller heater size and unit full load amps FLA lowers electrical connection requirements and reduces installation costs Split Coil Dehumidification Chilled Water Systems e Unique dual chilled water valve design provides superior SHR dehumidification and part load control compared to traditional single valve systems New control valve design employs 40 bar 580 psig PN40 static pressure rated ball valves High close off pressure rating of 13 8 bar 200psig for all models provides tight shutoff compared to globe valve systems Dual Chilled Water Valves Footprint amp Serviceability High kW to footprint ratio Front accessible for installation and routine servicing Front doo
20. capacity of 1625 430 USGPH at 3 2 m 10 ft head and be suitable for pumping 100 212 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 located in the base of the unit 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 Stainless Steel Condensate Tray A stainless steel condensate tray shall be provided for the evaporator coils in lieu of aluminium Ground Current Detector Electric Heater A factory wired detector device shall inhibit electric heater operation in the event that a heater element shorts to ground 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 pro
21. d 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 electrical supply to the indoor unit electrical supply to the air cooled condenser humidifier drain 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 compressor avoidance of oil logging in parts of the system and minimisation of noise and vibration Pipe sizing tables are provided in 051535 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 when
22. e dual control valves shall provide dehumidification against reduced room loads whilst maintaining space temperatures without the need for 2nd stage reheat Balancing and isolation valves shall be field supplied and fitted by others 2 Way Chilled Water Control Valve The water circuit shall include 2 way modulating forged brass ball valves and modulating non spring return actuators The valve body shall be designed for up to 40 bar 580 psig PN40 water pressure The actuator valve combination shall have a maximum closeoff pressure of 13 8 bar 200 psig The microprocessor positions the valves in response to room conditions Cooling capacity will be controlled by varying the position of the control valves The modulating valve travel for dehumidification shall be proportional Optional 3 Way Chilled Water Control Valve The water circuit shall include 3 way modulating forged brass ball valves and modulating non spring return actuators The valve body shall be designed for up to 40 bar PN40 water pressure The actuator valve combination shall have a maximum closeoff pressure of 13 8 bar 200 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 75 m up to 35 kW 1 50 m above 35 and
23. equipment 3 Standard pressure water regulating valve WRV 1 000 kPa Optional 3 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 Large Frame PEX Downflow and Upflow Units Chilled Water 50Hz Model Downflow 1020 1030 1040 2050 2070 2090 N A 3110 3140 Size Upflow 1020 1030 N A 2050 2070 N A 3080 3110 N A Downflow Units Rated Unit Performance 24 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 28 8 35 5 45 5 60 9 76 9 97 6 BTUH 98 300 121 100 155 200 207 800 262 400 333 000 n a 116 8 150 5 398 500 513 500 95 0 112 7 324 100 384 500 Sensible kW 23 1 29 9 35 3 47 7 62 8 74 0 102 000 120 400 162 800 214 300 Flow l s 1 25 1 54 1 98 2 64 3 34 4 24 GPM 19 8 24 4 31 4 41 8 52 9 67 2 Pressure Drop kPa 64 94 83 65 100 143 ft H O 21 4 31 5 27 8 21 8 33 5 47 9 24 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 25 4 31 5 40 6 54 2 67 9 87 2 108 1 134 7 BTUH 86 700 107 500 138 500 184 900 231 700 297 500 351 800 459 600 Sensible kW 23 4 30 5 35 7 48 3 64 0 74 8 96 7 113 9 BTUH 79 800 104 100 121 800 16
24. ever 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 0 Liebert Technical Data Manual 08 08 5 1 Installation Guidelines PEX Large Frame 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 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 clean 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 electrical supply to the indoo
25. ic Displays 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 ALARI 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 In ESCRIPTION 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 1 1 r 2l 1 I 1 1 1 L 1 1 Operating 1 T L 1 1 1 1 Standby 1 1 Standby T 1 ai Operating Standby Spare Parts PEX Large Frame The optional Large Graphic Display features a 320x240 dot matrix backlit screen with helpful system and maintenance views SPORES lt UNIT i QTY CODE Unit Diary Teamwork Mode 2 Units work together to provide
26. ing 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 network 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 100 240VAC single phase power 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 Intel
27. le sloped gutters for complete condensate removal and shall be removeable for cleaning in accordance with AS NZS 3666 1 2002 CI 2 8 1 The cooling coil shall be a maximum of 5 rows and 551 fins per metre 14 and the face velocity shall not be more than 2 5 m s 500 fpm 4 2 Technical Data Manual 08 08 0 Liebert Large Frame Guide Specifications 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 25 for 2 compressor models 50 for compressor models 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 Each refrigeration circuit shall include rigidly mounted isolation valves in the discharge and liquid lines to aid servicing and installation Field relief of the schrader valve shall indicate a leak free system 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 conde
28. ler s The fan motors shall be Electronically Commutated EC IP54 with internal protection and speed regulation via controller signal 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 Ib hr The humidifier shall be serviceable and removable from the front of the unit Infrared Humidifier The humidifier shall be of the infrared type consisting of high intensity quartz lamps mounted above and out of the water supply The humidifier pan shall be stainless steel and arranged to be removeable without disconnecting high voltage electrical connections The complete humidifier section shall be pre piped ready for field connection to water supply The humidifier shall be equipped with an automatic water supply system and 6 Liebert Technical Data Manual 08 08 4 1 Guide Specifications PEX Large Frame shall have an adjustable water overfeed to prevent mineral precipitation A high water detector shall shut down the humidifier to prevent overflowing The humidifier shall be approved for direct connection to potable water supplies in accordance with ATS 5200 101 and carry the WaterMark label Optional Immersed Electrode Humidifier Humidification shall be provided by boiling water in a high temperature polypropylene steam generator The hu
29. liSlot 485 card provides BMS management of Liebert PEX units over EIA 485 via Modbus RTU or Liebert s proprietary protocol for SiteLink connectivity 6 Liebert Technical Data Manual 08 08 4 7 Guide Specifications PEX Large Frame 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 amp 2 Compressor A 16 amp rated single pole circuit breaker and contactor shall be provided for each compressor circuit in the electrical panel for field connection to power the remote 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 each 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 Infrared Humidifier equipped units A factory wired and fitted condensate pump shall have a nominal
30. midifier shall have an efficiency of not less than 1 3 kg k W 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 CI 2 3 3 1 ELECTRIC HEATING Electric heating shall be provided in a single stage The elements shall be low watt density 304 304 stainless 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 CI 7 3 Optional 2nd Stage Electric Heating Electric heating shall be provided in two equal stages The elements shall be low watt density 304 304 stainless 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 CI 7 3 COMPRESSORISED SYSTEMS Scroll Compressor
31. 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 status 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 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 password shall be required to access the advanced menus User Menus
32. 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 Disables a Humidifier ON Humidifier ON Dehumidification b E Z I 1 Operating Operating i 1 1 3 E UNBALANCED LOAD NO LOAD 1 LI Standby 1 Standby E ew Torres 141777 Operating Standby Unit to Unit Configuration Teamwork Mode A Frame Evaporator Coils High efficiency heat exchanger design features an A Frame coil for precise control of cooling and dehumidification designed to optimise heat transfer and minimise pressure drop Draw through design pulls air evenly through the large face area cooling coil to maximise heat transfer efficiency Double angle condensate trays ensure correct water drainage and are removeable for service A Frame Coil High Sensible Heat Ratio SHR All models operate high sensible heat ratios to match the low latent loads of modern computer rooms and telephone exchanges etc 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 Highairflow achieves favourable sensi
33. mponents System Network Setup Menu shall allow Unit to Unit U2U communication and setup for teamwork modes of operation up to 32 units 4 6 Technical Data Manual 08 08 0 Liebert Large Frame Guide Specifications 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 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 hous
34. nser shall balance the heat rejection of the compressor at C ambient The condenser shall be constructed from heavy duty 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 The coil shall be have a maximum of rowsand 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 __ pole rpm230 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 WaterlGlycol Cooled Systems
35. puter Rooms Labs and Test Rooms Network Centres Production Facilities 4 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 x 50 Primary precision air 40 conditioning systems keep room temperature and humidity within this area of control Relative Humidity RH 8 2 10 12 15 18 21 24 27 Dry Bulb Temperature 9C 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 Full Service capability Factory trained Customer Engineers provide backup support 24 x 365 Established company Emerson Network Power has been designing and manufacturing precision environmental control systems for over 30 years 0 Liebert Technical Data Manual 08 08 1 1 Design PEX Large Frame Features and Benefits iCOM Intelligent Communications and Monitoring The Liebert iCOM control system offers the highest capabilities of unit control communication and
36. r unit condenser water supply humidifier drain 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 051535 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 electrical supply to the indoor unit chilled water supply humidifier drain 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 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 051535 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 wi
37. rs are hinged and removeable offering improved service access to the unit internals Compressors water cooled condensers and filter driers employ rotalock connections for ease of removal i e no hot works Front withdrawable air filters allow floor discharge units to be connected to return air ductwork 35kW Liebert PEX Competitor 1 Competitor 2 Unit Footprint Including Service Access m 0 Liebert Technical Data Manual 08 08 1 3 Design PEX Large Frame Features and Benefits Standard Belt Drive Fan e Forward curved double width double inlet DWDI centrifugal fans coupled to high efficiency motors standard on all models e Innovative belt drive system automatically provides high belt tension during startup eliminating slippage and greatly extending belt life Fan belts changed in seconds without tools Insulated static regain ducts in floor discharge models reduce noise turbulence and increase fan efficiency High external static pressure ESP motor option available Innovative Belt Drive System Optional EC Direct Drive Fan Compressorised Systems AVAILABLE 2009 Units are available with direct drive fans offering High efficiency external rotor electronically commutated EC motor with integrated electronics True soft start characteristics inrush current lower than operating current Backward curve corrosion resistant aluminium fan wheel Maintenance free design and construction
38. th local building codes Refer to 051535 User manual for further information 5 2 Technical Data Manual 08 08 0 Liebert PEX Large Frame Installation Guidelines Unit Dimensions amp Service Access 1970 PEX Large Frame Downflow Unit Type F FOR RAISED FLOOR APPLICATIONS Model Width ays FAIWIG L mm res oem _ L3 es E a NEN 2070 2090 1704 704 L3 m pes 6 Liebert Technical Data Manual 08 08 5 3 Installation Guidelines PEX Large Frame Unit Dimensions amp Service Access ee 850 PEX Large Frame Downflow Unit Type G FOR RAISED FLOOR APPLICATIONS 400mm minimum raised floor height required cu er win eo EET 2070 1704 704 5 4 Technical Data Manual 08 08 0 Liebert PEX Large Frame Installation Guidelines Unit Dimensions amp Mk Si Service Access PEX Large Frame Upflow Unit U amp V FOR PLENUM APPLICATIONS 550mm high plenum shown is optional Model Width Bays UA WIG UC Lr ome aes 18 s Lr pe es pm Le a aes pr L3 pom mee ae fan E ame oton Liebert Technical Data Manual 08 08 5 5 Installation Guidelines PEX Large Frame Unit Dimensions amp Service Access PEX Large Frame Upflow Unit Type D FOR DUCTED APPLICATIONS mo es ies y ERE Ec 2 3080 FLOORSTAND
39. uired by local or national codes 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 550 mm 21 7 in high Double deflection discharge grilles made from aluminium and powder coated black shall be fitted to the front panels 6 Liebert Technical Data Manual 08 08 4 9 Guide Specifications PEX Large Frame This page intentionally left blank 4 10 Technical Data Manual 08 08 0 Liebert PEX Large Frame Installation Guidelines Unit Installation 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 liqui
40. v 0 0808 Emerson Network Power The global leader enabling in Business Critical Continuity emersonnetworkpower com ACPower Systems Embedded Computing Outside Plant M Services Connectivity 8 Embedded Power Power Switching and Controls Mi Site Monitoring DCPower Systems Integrated Cabinet Solutions Precision Cooling Surge amp Signal Protection Emerson Network Power and the Emerson Network Power logo are trademarks and service marks of Emerson Electric Co 2007
41. vide 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 4 8 Technical Data Manual 08 08 0 Liebert Large Frame Guide Specifications 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 Liquitect Unit Shutdown Sensor LT410 Liquitect signal shuts down unit and provides one 1 N O contact for field alarm connection Low Pressure Transducer s Replaces the standard pressure switch to indicate refrigerant suction pressure s via the iCOM display panel High Temp Sensor A separate sensor shall sense return air temperature and shut down the unit if temperature reaches 51 7 C 125 F Note This device is not meant to replace any fire detection system that may be required by local or national codes Smoke Sensor A smoke sensor monitors the return air shuts down the unit upon detection and sends a visual and audible alarm Dry contacts are available for a remote customer alarm The smoke sensor includes a supervisory contact closure Note This smoke sensor is not intended to function as or replace any room smoke detection system that may be req
42. wing them to work together as a single system to optimise room performance The Liebert ICOM control system offers variety of advantages Removable display makes troubleshooting servicing easier Parts list available on control for easier maintenance The standard Small Graphic Display features a 1 28x64 dot matrix backlit screen Advanced monitoring can be achieved with the addition of the Optional Wall Mounted Display NH Intelligent Communications and Monitoring Saves Energy using Predictive Humidity Control Built in Lead Lag Functions for enhanced system reliability Wellness Calculation alerts service personnel before problems occur Unit to Unit U2U Communications allows Lead Lag and optional teamwork settings for maximum flexibility and control 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 485 cards can provide Liebert SiteScan Web and BMS systems with the capability to monitor your Liebert PEX unit l Liebert Technical Data Manual 08 08 3 1 ICOM Control Additional Views Available with Large Graph
43. with normal dump drain valves Fully serviceable design ensures quick and cost effective maintenance Approved for direct connection to potable water supplies Immersed Electrode Humidifier w Liebert Data Manual 0808 1 5 Design PEX Large Frame Features and Benefits 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 Electric Heaters Single stage electric reheat system 2nd stage optional with backup relay and safeties 304 stainless steel low watt density fin tubular elements Optional Ground Current Detector Optional Reheat Humidifier lockout reduces power requirements during emergency power operation Stainess Steel Electric Heaters Dual Refrigerant Offering All compressorised models are designed to operate on either HCFC R22 or HFC R407C refrigerants Choice of Refrigerants 1 6 Technical Data Manual 08 08 0 Liebert PEX Large Frame Model Designation 1 P 2 0 4 0 Product Range
Download Pdf Manuals
Related Search