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LiebertR PDX Top EfficiencySophisticated design and development tools, such as Particle Image Velocimetry andComputational Fluid Dynamics are used by Emerson Network Power to identify the bestcomponents layout in order to achieve an even and pressure-equalized airflow distribution withinthe unit which optimizes the entire coil surface area in the heat exchanging process.LiebertÒ PDXunits feature a very high coil heat exchanger surface respect to the exchanged power. Using theindex [frontal Surface x Rows / refrigeration Power] values of over 100 mm2/W are obtained.In dual circuit units, the dual stage coil increases the evaporator temperature maximizing the SHRand increasing the unit efficiency.At partial load, the efficiency is strongly increased, due to the use of the total amount of airflow andfrontal coil surface: with non-staged coil system, only half heat exchanger frontal surface wasinterested by the thermal exchange.Sophisticated design and development tools, such as Particle Image Velocimetry andComputational Fluid Dynamics are used by Emerson Network Power to identify the bestcomponents layout in order to achieve an even and pressure-equalized airflow distribution withinthe unit which optimizes the entire coil surface area in the heat exchanging process.Digital Scroll CompressorDigital Scroll provides the necessary level of cooling by adjusting its delivery according to the heatload, thus ensuring constant, precise temperature levels.The Digital Scroll operates in two stages - the "loaded state", when the solenoid valve is normallyclosed and "unloaded state", when the solenoid valve is open. During the loaded state thecompressor operates like a Standard scroll and delivers full capacity and mass flow. However,during the unloaded state, there is no capacity and no mass flow through the compressor.This allows having a number of benefits in terms of Efficiency:D Perfect match between Cooling Capacity and Heat Load.D Lower power input at partial load.D Possibility to size cooling system to overcome future heat load growth.D Improved SHR once the compressor is modulating (due to better evaporating temperature)ModulationChamberSolenoidValveBleed HoleSpringLift PistonAssemblyElectronic Expansion Valve (EEV)The valve is designed for modulating control of refrigerant circuits withhighspeed and high precision. The EEV provides superior performancecompared to a Thermostatic Expansion Valve (TXV), due to:D Precise flow controlD Positioning timeEEV ensures a better control on super heating at the end of the evaporator,ensuring at the same time that compressor will never be filled by liquid fromthe 10% to 110% of its nominal capacity, instead a mechanical one cannotensure it. It has to be calibrated and then it will work properly but onlyaround the calibration point.This means that a TXV works better (i.e. better control, longer life) with a condensing pressure asmuch as possible constant. For such reason with TXV the condensing temperature is kept around45 C as set point. But during the coldest period the condensing temperature can be lowered andthe electronic expansion valve adapts to this new situation. This permits an increase of the coolingcapacity of the unit, a decrease of the unit power input and so increase the energy efficiency of theentire LiebertÒ PDX unit.LiebertÒ PDX allows having an option the EEV both on Standard Scroll and on Digital Scroll. Thechoice is driven by the application:Liebert PDX - PD - 265200 - 29.07.20131-3

LiebertR PDX Top EfficiencyDDOnly temperature control - or wide range or Humidity band T³In this case the EEV gives a greatefficiency effects both with Standard and Digital Scroll technology. To get the biggest advantage,a different pressure set point can be used for the fan speed controller of the Liebert remotecondenser.Close Humidity control ³ Often, even the TXV valve allows to get good results, mainly thanks tothe Digital Scroll modulation.LiebertR PDX serviceabilityAttention to design detail means low operational costs including product maintenance through highlevels of reliability and a service friendly design. As an example, all the crucial parts of therefrigeration circuit (i.e.: thermostatic valves, sight glasses and liquid line driers) are groupedtogether and accessible simply by opening the front door.Easy maintenanceAll components are easily accessible fromthe front of the room unit. The servicecompartment facilitates checking andsetting of refrigeration circuit, withoutchanging aeraulic conditions. The access tothe compressor is possible even when theunit is operating by removing the front panel.The access to the fan is executed with thegreatest care for easier interventions(maintenance and/or fan replacement).One very important feature, for example, isthe possibility to check the total pressuredrop of the high pressure piping using theschrader connections available in the frontpart of the machine.1-4Liebert PDX - PD - 265200 - 29.07.2013

2Model ConfigurationModel ConfigurationDigit NomenclatureThe unit is fully defined by twenty two digits.123456789 10 11 12 13 14 15 16 17 18 19 20 21 22Digit 7PXDigit 1 and 2PXLiebertÒPDXDigit 3, 4 and 5Unit ModelSystem TypeDigit 6Air DischargeUHDEUpflowDownflow FrontalDownflow UpDownflow DownAWFDHPEAir CooledWater CooledFreecooling (mixed mode)Dualfluid chilled water air cooledDualfluid chilled water water cooledAir Cooled predisposition forpumped refrigerant economizerDualfluid chilled water air cooled predisposition for pumped refrigeranteconomizerDigit 8 - AirflowDigit 14 -Air Filter EfficiencyL113Premium Fan ModuleBasic Fan Module (Fix Speed)F5 (EU5) dust spotF5 (EU5) dust spot Clogged FilterDigit 9 - Main Power SupplyDigit 15 -Condensing Control3TA1Single 400V / 3ph / 50 Hz NSingle 380V / 3ph / 60Hz NSingle 460V / 3ph / 60HzDigit 10 -Cooling System67SU4TWXSingle Circuit Scroll R410A with TXVSingle Circuit Digital Scroll R410A with TXVSingle Circuit Scroll R410A with EEVSingle Circuit Digital Scroll R410A with EEVDual Circuit Scroll R410A with TXVDual Circuit Digital Scroll R410A with TXVDual Circuit Scroll R410A with EEVDual Circuit Digital Scroll R410A with EEV7Digit 16 -Colour1NoneInfrared HumidifierUltra Sonic HumidifierElectrode HumidifierDF2Q57RGSDigit 12 -Microprocessor Control23UBCDWXYZInner Display only T sensorInner Display TH sensorSmall Cold fire display T sensorSmall Cold fire display TH sensorLarge Cold fire display T sensorLarge Cold fire display TH sensorSmall Cold fire display T sensor (for extended UP units)Small Cold fire display TH sensor (for extended UP units)Large Cold fire display T sensor (for extended UP units)Large Cold fire display TH sensor (for extended UP units)Digit 13 -Heating & Re-Heating012468ANoneElectric heating Std CapacityElectric heating High CapacityHot Water HeatingHot Gas ReheatEl. heating Std Capacity Hot Water HeatingEl. heating Std Capacity Hot Gas ReheatLiebert PDX - PD - 265200 - 29.07.2013Black Emerson RAL 7021Digit 17 -High Voltage OptionDigit 11 -Humidification0HUSAir Cooled or Water Cooled with Standard Pressure, 2way MBVWater Cooled with Standard Pressure, 3 way MBVTUVStandard Power SupplyDual Power Supply Parallel Magnetic circuit breaker for10 A single phase 50HzMagnetic circuit breaker for 10 A single phase 50HzMagnetic circuit breaker for 10 A three phases 50HzCondensate PumpMagnetic circuit breaker for 10 A single phase, 50Hz, withCondensate PumpMagnetic circuit breaker for 10 A three phases, 50Hz, withCondensate PumpDual Power Supply Alternate with ATS Magnetic circuitbreaker for 10 A single phaseDual Power Supply Alternate with ATS and UPS for iCOM Magnetic circuit breaker for 10 A single phase breakerfor 10A single phaseDual Power Supply parallel Magnetic circuit breaker for10A three phasesDual Power Supply Alternate with ATS Magnetic circuitbreaker for 10A three phasesDual Power Supply Alternate with ATS and UPS for iCOM Magnetic circuit breaker for 10 A three phasesDigit 18 - Package Option0SFGHLNonePredisposition for Smart Aisle (Predisposition for damper,Sensors, 3 position switch)Predisposition for Economizer (sensors, predisposition fordampers)Predisposition for Smart Aisle EconomizerPredisposition for damperPredisposition for plenum installation2-1

Model ConfigurationDigit 19-MonitoringDigit 20- SensorsN012345CDEFGHJK0No IS HousingNo CardIS Web onlyTwo IS WebIS485 onlyTwo IS485IS Web & IS 485SiteLink - E cardSiteLink - E plus IS Web cardSiteLink - E plus IS485 cardIS-IPBML card2 x IS-IPBML cardIS-IPBML plus 1 x IS Web cardIS-IPBML plus 1 x IS485 cardIS-IPBML plus SiteLink E cardNoneDigit 21 -PackagingPCSPLP and PalletPLP and Wooden CrateSeaworthyDigit 23 -Special RequirementsAXStandard Emerson Network PowerSpecial Emerson Network PowerDigit Nomenclature (Fan Module)Only for Extended Height UnitThe base unit is fully defined by thirteen digits123456789 10 11 12 13BMxxxDigit 1 and 2 - Fan ModuleBM Fan Base ModuleBF Fan Base FrameTP Fan Top PlenumDigit 3, 4 and 5 - Size: Nominal Length176 - 1750 mm121 - 1200 mmDigit 6 - Air delivery (only for BM)Digit 9 - PackagingSBFPCSStandardBack (fans removal from the front)FrontDigit 7 - FansL1Premium Fan ModuleBasic Fan Module (Fix Speed)Digit 8 - Heaters012No heatersStd CapacityHigh CapacityDigit 10 -FreeDigit 11 -FreeDigit 12 -FreeDigit 13 -Special RequirementsAX2-2PLP and PalletPLP and Wooden CrateSeaworthyStandard Emerson Network PowerSpecial Emerson Network PowerLiebert PDX - PD - 265200 - 29.07.2013

Model ConfigurationAir discharge version (digit 6)U- UpflowH- Downflow frontal (Standard unit only)E- Downflow DownD- Downflow UpOption for Extended Height unit Downflow UpFront Air Delivery (Option F in Digit 6 Fan Module)Back Air Delivery* (Option B in Digit 6 Fan Module)* The unit has to be installed with the air delivery ducted or withthe air flow channelled below the raised floor.Liebert PDX - PD - 265200 - 29.07.20132-3

Model ConfigurationCooling Versions (Digit 7)Version ADirect expansion units with air-cooled condenserAir cooled direct expansion units optimizecondensing temperature in the simplest installationconfigurations and with minimized site impact.The compressor (1) pumps the hot gaseous5refrigerant into an outdoor air-cooled condenser(2). The liquefied refrigerant arrives to a liquidreceiver (3) that ensures a constant and even4refrigerant flow to the expansion valve (4) and then89arrives to the evaporator (5). Here the refrigerant,thanks to the heat - exchanged with the room air2moved by the fan (6) - evaporates and returns tothe compressor (1); from this point, the refrigerant31begins a new refrigeration cycle. To maintain thecorrect refrigerant discharge pressure, the speed of7the motor fan (8) is controlled (proportional mode).6Shut-off valves are provided as standard to assistwith routine maintenance. The compressor (1) hasa built-in non-return valve to avoid return of liquidrefrigerant from the condenser in summertime, thusprotecting the compressor from undesired refrigerant slugging during the start up. A secondnon-return valve (7) is necessary to avoid - in wintertime - refrigerant migration from the liquidpipes and the receiver (3) to the condenser (2), that should be responsible of low pressureintervention at the start-up of compressor.For safety reason, a relief valve (9) is installed on the liquid receiver (3); this valve is equipped withflanged connections so that the refrigerant may be discharged to the outside.External air-cooled condenser (2)The units may be connected with a wide range of our condensers in standard or low noise version.For technical data and performance, refer to the relevant technical documentation. Chap. 5 givesthe recommended matching condenser for LiebertÒ PDX units as a function of outdoor airtemperature. To ensure correct operation, best performance, and longest life the units must beconnected to remote condensers approved by Emerson Network Power.Note 1: Units and external condensers are supplied separately.Note 2: The room unit refrigeration circuit is pressurized with helium at 3 bar and the condenser refri geration circuit at 2 bar with dry air.Note 3: The customer is responsible for making connections between the Unit and the external con denser and for charging with refrigerant (standard R410A) and oil, when request.Full instructions for these operations are given in the User Manual.Version WDirect expansion units with water -cooled condenserLiebertÒ PDX Water Cooled is the ideal configuration forleveraging all its efficiency benefits on applications withsignificant distances between internal and externalunits, or those with strong variations in geodetic height.The compressor (1) pumps the hot gaseous refrigerantinto a water-cooled condenser (2). The liquefiedrefrigerant arrives to a liquid receiver (3) that ensures aconstant and even refrigerant flow to the expansionvalve (4) and then arrives to the evaporator (5). Here therefrigerant, thanks to the heat - exchanged with theroom air moved by the fan (6) - evaporates and returnsto the compressor (1); from this point, the refrigerantbegins a new refrigeration cycle.The compressor (1) has a built-in non-return valve toavoid return of liquid refrigerant from the condenser,thus protecting the compressor from undesirablerefrigerant slugging during the start up. A secondnon-return valve (7) is installed to avoid refrigerantmigration from the liquid pipes and the receiver (3) to thecondenser (2), that should be responsible of high2-4Cooling WaterLiebert PDX - PD - 265200 - 29.07.2013

Model Configurationpressure intervention at the start-up of compressor.For safety reason, a relief valve (9) is installed on the liquid receiver (3); this valve is equipped withflanged connections so that the refrigerant may be discharged to the outside.Water-cooled condenserThese units are provided with one very efficient stainless steel brazed-plate water-cooled con denser (2). The condenser is fitted with a modulating valve (8) for the automatic control of condens ing pressure. The units operate with mains water or closed circuit with an external Dry Cooler.When operating in a closed circuit, to avoid undesired ice formation in wintertime, it is advisable touse water/glycol mixture: refer to Chap. 5 for the percentages to be used at minimum ambient tem peratures. Dry Coolers are available as an option; water-glycol mixture and circulation pump(s) arenormally supplied by others.If mains water is used, a mechanical filter must be fitted in the water circuit to protect the plate con denser (2) (for other information see the User Manual).Note. The water-cooled Liebert Ò PDX versions are filled with the complete charge of the requestedrefrigerant (standard R410A).Version FFreecooler unitsAs seen in the previous chapter for allapplications where efficiency is a primeobjective, the LiebertÒ PDX offers thepossibility of leveraging the Freecoolingeffect for the longest period of time, as aresult of its enhanced coil distribution.The flexibility of the LiebertÒ PDXFreecooling configuration ensures thehighest energy savings and efficiency invariable working conditions including DXmode.Freecooling modeThe Freecooler unit cools the air flow bymeans of the air refrigerant coil (5) in dir ect expansion rows [direct expansionmode] or, as an alternative, the air/watercoil (5) in freecooling rows [freecoolingmode]. Whenever the outdoor temperat ure is at least 5 degrees below the indoorCooling Waterreturn temperature, the water flow iscooled by an external Dry Cooler (10) and passes through the coil (5). When the external temperat ure is higher than ZET (Zero Energy Temperature), the water exchanges heat with the refrigerant inthe water-cooled plate condenser (2). When the external temperature is below ZET, the water iscooled as much as to cool the room air directly in the air/water coil (5, freecooling rows).Refrigeration circuitThe compressor pumps the hot gaseous refrigerant into a water-cooled condenser (2). The lique fied refrigerant arrives to a liquid receiver (3) that ensures a constant and even refrigerant flow to theexpansion valve (4) and then arrives to the direct expansion rows of the evaporator (5). Here the refri gerant, thanks to the heat - exchanged with the room air moved by the fan (6) - evaporates andreturns to the compressor (1); from this point, the refrigerant begins a new refrigeration cycle.The compressor (1) has a built-in non-return valve to avoid return of liquid refrigerant from the con denser, thus protecting the compressor from undesired refrigerant slugging during the start up. Asecond non-return valve (7) is installed to avoid refrigerant migration from the liquid pipes and thereceiver (3) to the condenser (2), that should be responsible of high pressure intervention at thestart-up of compressor.For safety reason, a relief valve (9) is installed on the liquid receiver (3); this valve is equipped withflanged connections so that the refrigerant may be discharged to the outside.Note. The Liebert Ò PDX Freecoolers are filled with the complete charge of the requested refrigerant(standard R410A).Water-cooled condenserThese units are provided with one very efficient stainless steel brazed-plate water-cooled con denser (2). The condenser is fitted with a modulating valve (8) for the automatic control of condens ing pressure.To reduce water and energy consumption (pump), it's advisable to adopt a cooling water controlvalve (by the user), able to stop water feeding when unit is off.Liebert PDX - PD - 265200 - 29.07.20132-5

Model ConfigurationWater/glycol circuitThe units operate with water in closed circuit with an external Dry Cooler (10), cooled by theoutside ambient air. To avoid undesired ice formation in wintertime, it is advisable to use water/glycolmixture: refer to the User Manual for the percentages to be used at minimum ambient temperatures.The circulation of the water-glycol mixture is forced (the pump (11) and the water-glycol mixtureare not supplied).The unit is provided with 2-way modulating valve (12) to control the glycoled-water flow passingthrough the water/glycol coil.The opening or closing signals, generated by the electronic controller, manage the valve actuatormovement in order to maintain the desiderd conditions in the conditioned room.Version DAir -cooled condenser dualfluid unitsDual Fluid can be translated as cooling redundancy. In factthe unit provides the Direct Expansion full back up coolingto a Chilled Water common working circuit.Ideal for chilled water based applications with transitionbetween Air Conditioning and Precision Cooling, theLiebertÒ PDX Dual Fluid Air Cooled configuration, offersefficient direct expansion cooling that works as redundantcooling for chilled water coils.The Dualfluid unit cools the air flow by means of the airrefrigerant coil (5) in direct expansion rows [directexpansion mode: see refrigeration circuit] or, as analternative, the air/water coil (5) in the chilled water rows[chilled water mode].Refrigeration circuitThe compressor (1) pumps the hot gaseous refrigerant intoan outdoor air-cooled condenser (2). The liquefied refri gerant arrives to a liquid receiv

Contents1 Liebert PDXTop Efficiency 2 ModelConfiguration 3 Operating Range 4 TechnicalData 5 HeatRejection (throughcondenser) 6 AirFlowCharacteristics 7 Sound Pressure Level 8 TechnicalSpecifications 9 FilterSection 10 MicroprocessorControls 11 Humidification 12 DimensionalData / Connections 13 Refrigerant and Hydraulic Circuits 14 Accessories