XD Series - Advanced Power Protection Industries
Contents
1. Heat Generating Critical Equipment Designing an XD Solution 2 5 XDV Unit Placement XDV units should be placed on top of the cabinets that generate the greatest amount of heat If heat loads are dispersed evenly throughout the room the XDV modules may be spread out accordingly The XDV must be placed toward the front of the equipment cabinet so that its front bottom edge is flush with the front top edge of the cabinet Placing the unit farther back on the top of the unit will restrict airflow into the cold aisle Placing the unit farther to the front will decrease the amount of hot air drawn into the unit Figure 4 Positioning XDV on top of cabinet N XDV is suspended from roof structure separated from rack by an air blocker CORRECT XDV is flush with front edge of rack INCORRECT XDV is too far from front edge of rack INCORRECT XDV hangs over front edge of rack Both of the XDV s power cords should be connected to power sources If only one power source is avail able then only the power cord labeled SECONDARY should be connected to the power source Piping for the XDV is routed upward to the main return and supply pipes to and from the XDP XDC Table 2 below can be used to determine the correct number of XDV modules Table 2 Determine2. 0 Liebert Keeping Business in Business HEAT REMOVAL PRECISION AIR LIEBERT XD SYSTEM SYSTEM DESIGN amp CONFIGURATION amp EMERSON Network Power 1 0 1 1 2 0 2 1 2 2 2 8 2 4 2 5 2 6 2 7 2 8 2 9 2 10 2 11 2 12 3 0 A 1 1 A 1 2 A 1 3 A 1 4 A 1 5 TABLE OF CONTENTS SYSTEM DESCRIPTION ek EUR AC eae Pe ACA E Ere d Rd 1 DOIG Laat osos dese uS e a e Deed thia 1 DESIGNING AN XD SOLUTION 0000 cece ehh hh hh 3 Determine Cooling Requirements and Select XD 3 Calculate the Heat Load to be Handled by XD 3 Selecting XDO or Modules 4 Airflow Requirements for XD 4 2 4 1 Determining Spacing of XDOs in an Aisle 4 2 4 2 Determining Vertical Placement of XDOs Above the Cold 5 ADV Unit PISCereti ea o ee E dau e na GR ribbon 6 XDP XDC Placement ou aou ab o RAP VEN EET OPE 6 XD Piping System Design hr 7 Other XD Piping Design Factors 0 0 0 es 8 Bypass Flow Controllers eee ee ee e hr 8 Determining Coolant Volume 10 2 10 1 XDP XDC Pumped R 13
3. Chilled water connections to the XDP are near the bottom of the unit Refer to the XDP user manual SL 16641 for further information Piping is routed downward from the unit to chilled water piping under the raised floor Connections are made using standard practices for copper chilled water piping Victaulic connections may be used to simplify installation in existing facilities Refer to Table 13 and Appendix 1 0 Guidelines for Leak Testing and Fluid Requirements of Liebert Systems Using Water or Glycol for additional information Electrical Electrical service shall conform to national and local electrical codes Make all wiring and electrical connections in accordance with local and national codes Refer to equipment nameplate regarding wire size and circuit protection requirements Refer to electrical schematic when making connections 11 Specifications 3 0 SPECIFICATIONS This document contains preliminary technical information for Liebert s XDO XDV and XDP XDC For technical data about other units in the Liebert XD product family RackCooler XDR CDU XDWP and Air Flow Enhancer XDA see separate user manuals and system configuration guides Table 10 Liebert XDO16 specifications Number of Models 4 based on input voltage and optional condensate sensing Cooling Capacity nominal 16 kW 4 6 Tons 55 F 13 C Entering Coolant Temperature 85 F 30 C Entering Air Temperature 50 F 10
4. XDC Pumping and control is performed by chiller XD Coolant The coolant used in the XD system is HFC 134a 1 1 1 2 tetrafluoroethane made by a number of manufacturers The amount of coolant used by the XD system may be significantly higher than typi cal DX cooling systems CAUTION The XD pumped R 134a refrigerant circuits do not use refrigerant oil Do NOT put oil in the R 134a system All the major components of an XD system must be installed in a space with a volume of at least 1 000 ft 28 3m for each 16 pounds of coolant in that system from Table 1 ASHRAE Standard 15 2001 Safety Standard for Refrigeration Systems If the XDP XDC is placed in a separate area such as a machine room then this area must also meet the volume requirement Inside the critical space this includes the space under the raised floor and the space between the top of the raised floor and the bottom of a suspended ceiling If the suspended ceiling is all open grates then this additional space up to the overhead deck would also be included Example A space is 5 000 square feet with an 18 raised floor and an 8 6 suspended ceiling XDOs and an XDP are to be placed in this raised floor area The volume of the space is 1 5 8 5 x 5 000 or 50 000 cubic feet The maximum amount of coolant that can be used in a single XDP XDC XDO XDV system within this space is 16 50000 1000 16 50 800 lbs Multiple XD systems can be installed in th
5. All piping must be ASTM American Society for Testing and Materials Type L copper pipe Piping for the XD system is arranged in a manner similar to piping for a chilled water system XDOs or XDVs are connected in parallel between main return and supply pipes going to and from the XDP XDC Figure 5 represents a typical configuration The guidelines provided for pipe size must be strictly followed Failure to size the main lines and connection lines adequately may result in reduced cooling capacity The critical aspects of pipe sizing are related to coolant volume and pressure drop Both must be minimized Figure 5 Piping for XDP XDC used with XDO or XDV units XDO XDV XDO XDV XDO XDV XDO XDV XDP XDC SLOPE The main supply and return lines to and from the XDP XDC must be sloped downward toward the XDP XDC at a rate of 1 per 10 feet 25 4mm per 3m of pipe run Horizontal connector lines should also be sloped downward from the cooling modules toward the main supply and return lines The assembly and connection means used for piping in the XD system are similar to that of conven tional refrigeration systems Brazing material or soft solder may be used However if brazing mate rial is used the lines being brazed MUST be pressurized with flowing dry nitrogen during brazing to prevent excessive oxidation and scale formation inside the piping Please see Table 3 below for
6. 125 F 51 6 C condensing temperature and 50 F 10 C evaporating temperature Electrical Requirements Input 460V model 3 phase 60 Hz Full Load Amps 460V model 79A Minimum supply wire sizing ampacity 84A Maximum fuse or circuit breaker size 100A Dimensions inches mm Height Unit only 78 1981 Height As shipped 83 2108 Width 74 1879 Depth 34 863 Weight Ib kg Unit only 2000 907 Shipping weight 2050 930 Installed with R 134a 2200 998 Pipe Connections XD Coolant supply to XDO or XDV 1 1 8 OD Cu XD Coolant return from XDO or XDV 2 1 8 OD Cu Liquid Line DX circuit 7 8 OD Cu Hot Gas Line DX circuit 1 3 8 OD Cu Number of XDOs Connected Maximum 10 Minimum 4 Number of XDVs Connected Maximum 20 Minimum 8 Cabinet Exterior Finish Black matte finish heat fused powder coat 13 Specifications Table 12 Liebert XDV specifications Number of models 4 based on input voltage and optional condensate sensing Cooling capacity nominal 8 kW 2 2 Tons 55 F 13 C Entering Coolant Temperature 90 F 32 C Entering Air Temperature 50 F 10 C or lower dew point rear inlet Electrical requirements Input 120V model 1ph 50 60 Hz 230V model 1ph 50 60 Hz Input power connections 120V
7. 134a Pumped Circuit 1 Open all service valves 2 Place a maximum of 150 PSIG 1034 kPa of dry nitrogen with a tracer of R 134a in the system 3 Check the system for leaks A 1 3 3 Leak Check XDC R 407c DX Circuit 1 Make sure the unit is Off Open all disconnects and pull all fuses except the control fuses On units supplied with circuit breakers open all breakers except for the transformer 2 Energize the liquid line solenoid valves via 24VAC or through Diagnostics under Test Outputs select DEHYDRATION to be On This will energize the solenoids and hot gas valves to open simultaneously on Circuit 1 and Circuit 2 NOTE Q The procedures above allow the technician to use 24VAC power and controls to open liquid line solenoid valve s for the dehydration process If no power is at the unit disconnect the technician is to use a separate 24VAC source rated at 75 VA and connect to the system liquid line solenoid valve s directly 3 Attach ajumper hose to the suction and discharge service valves of the compressor Open all compressor service valves 4 Connect the tank of dry nitrogen to the Schrader valves on the liquid lines and the hot gas lines 5 Pressurize the system circuit s to 150 PSIG 1034 kPa with dry nitrogen with a trace of refrigerant Check the system for leaks with a suitable leak finder 16 Guidelines for Leak Testing and Fluid Requirements of Liebert Systems Using Water or Glycol 1 4 Freeze Prote
8. HEAT REMOVAL PRECISION AIR Liebert XD Cooling Units SYSTEM DESIGN amp CONFIGURATION The Company Behind the Products With over a million installations around the globe Liebert is the world leader in computer protection systems Since its founding in 1965 Liebert has developed a complete range of support and protection systems for sensitive electronics e Environmental systems close control air conditioning from 1 to 60 tons Power conditioning and UPS with power ranges from 300 VA to more than 1000 kVA e Integrated systems that provide both environmental and power protection in a single flexible package Monitoring and control from systems of any size or location on site or remote e Service and support through more than 100 service centers around the world and a 24 7 Customer Response Center While every precaution has been taken to ensure the accuracy and completeness of this literature Liebert Corporation assumes no responsibility and disclaims all liability for damages resulting from use of this information or for any errors or omissions 2005 Liebert Corporation All rights reserved throughout the world Specifications subject to change without notice Liebert and the Liebert logo are registered trademarks of Liebert Corporation All names referred to are trademarks or registered trademarks of their respective owners SL 16650 01 05 Rev 5 Technical Support Service Web Site www liebe
9. cooling demand but airflow through the enclo sure must be adequate to extract the heat from the cabinet Liebert s XDA units can boost the airflow to levels necessary to protect critical equipment It is particularly suited to the hot aisle cold aisle arrangement Determining Spacing of XDOs in an Aisle XDO units should be placed in rows directly above the cold aisles of a room for optimum cooling Each XDO serves an area equal in width to the cold aisle spacing typically 12 to 16 feet 3 7 to 4 9m The length of the area served includes any space between XDO modules in a row Depending on the cool ing capacity to be achieved spacing between XDO modules in a row can vary from zero to as much as 6 feet 1 8m When the spacing increases to more than 6 feet 1 8m overall performance of the sys tem may be negatively affected and gaps in cooling may occur Figure 2 placement over cold aisle XDO Hot air is drawn into the XDO for o Critical Equipment Critical Equipment Critical Equipment Critical Equipment Cooled air enters the Hot air goes into the hot aisle COLD AISLE HOT AISLE COLD AISLE Cold Aisle Spacing Table 1 can be used to determine the correct number and spacing of XDOs Hot air goes into the hot Designing an XD Solution Table 1 Calculating quantity and spacing of XDO16 modules Input Information Step Result Total heat load in t
10. model 2 power cords NEMA 5 15P plugs 230V model 2 power cords IEC320 C14 plugs Full Load Amps 120V model 2 0A 230V model 1 0 A Power consumption nominal 200 Watts Dimensions inches mm Height unit only 14 1 8 359 not including pipe connections Height including pipe connections 18 3 4 476 Width 23 1 2 597 Depth Top 39 1 2 1003 Depth Bottom 29 1 2 749 Weight Ibs kg Unit only 77 35 Shipping weight 125 57 Installed with coolant 79 36 Number of fans 2 Audible noise 78 dBa sound power both fans running Pipe connections XD Coolant supply from XDP XDChiller 1 2 OD Cu XD Coolant return to XDP XDChiller 5 8 OD Cu Airflow nominal ft min m hr 1000 1699 with rear inlet Bottom inlet airflow may be less depending on restrictions inside cabinet Serviceable parts Fans and electrical components Cabinet exterior finish Black matte finish heat fused powder coat Options Condensate sensing factory installed Dry contact outgoing signal 14 Specifications Table 13 Liebert XDP specifications Number of models 4 based on input voltage and pump redundancy Cooling capacity nominal 160 kW 46 Tons with 45 F 7 C entering water temperature and 140gpm 530lpm water flow rate Capacity is reduced when glycol mi
11. required number of XDV modules Input Information Step Total heat load in the room kW A Reserve capacity needed 10 to 25 of A is recommended Results Required cooling capacity A B Existing planned Liebert Deluxe sensible capacity Required XD system cooling capacity C D Number of XDV modules required E 8 rounded up Number of XDP XDC modules required F 20 rounded up Room area square feet O nim Ww Area served by each Required XD system cooling density E H L OK if under 580 for 12 foot cold aisle spacing OK if under 435 for 16 foot cold aisle spacing Otherwise additional Liebert Deluxe unit capacity is needed 2 6 XDP XDC Placement The XDP XDC may be placed in the critical space or in an adjacent equipment room The allowable dis tance between the XDP XDC and its connected cooling modules is determined by the piping design and by the amount of coolant required Refer to 1 1 XD Coolant and 2 7 XD Piping System Design The maximum height of any of the main or connecting piping should be no more than 20 feet 6m above the top of the XDP XDC unit XD cooling modules should be placed as close to the same level as possible The differences in elevation between the highest and lowest cooling module in a system should be no more than 6 feet 609 6mm Designing an XD Solution 2 7 XD Piping System Design
12. 45 Ibs 2 92 0 45 0 68 0 28 0 43 0 08 0 26 0 04 0 07 lbs 165 lbs Ibs Ibs Ibs Ibs Ibs Ibs R 134a per XDV does not include piping connector lines to and from XDV per foot of main supply actual length per 1 1 8 OD copper tubing per foot of main supply actual length per 1 3 8 OD copper tubing per foot of main return actual length per 2 1 8 OD copper tubing per foot of main return actual length per 2 5 8 OD copper tubing per foot of 1 2 OD copper tubing XDV supply connector actual length per foot of 5 8 OD copper tubing XDV supply connector actual length per foot of 5 8 OD copper tubing XDV return connector actual length per foot of 7 8 OD copper tubing XDV return connector actual length Amount of XD Coolant needed for ONE XDV XDP system Coolant volume calculation XDP XDC with XDO16 systems R 134a per XDP includes charge of one XDP while running 165 165 Ibs 165 Ibs Ibs Ibs Ibs Ibs R 134a per XDO16 does not include piping connector lines to and from XDO16 per foot of main supply actual length per 1 1 8 OD copper tubing per foot of main supply actual length per 1 3 8 OD copper tubing per foot of main return actual length per 2 1 8 OD copper tubing per foot of main return actual length per 2 5 8 OD copper tubing per foot of 1 2 OD XDO supply connector actual length per foot of 7 8 OD XDO supply connector actual length per foot of 7 8 OD copper tubing XDO16 return conn
13. 4a Circuit 10 2 10 2 DX R 407c Circuit Volume Air Cooled 11 Chilled Water Piping eee ee ener xr due RE p deu 11 Electrical TEMP 11 SPECIFICATIONS dee SR Ses Wave PaO ROR Boe Sal eee eR eh 12 APPENDIX 1 0 GUIDELINES FOR LEAK TESTING AND FLUID REQUIREMENTS OF LIEBERT SYSTEMS USING WATER OR GLYCOL vk ei ied Gia Se See ee RO Ka oe Pee eee iS 16 SCOPE 16 General Guidelines and Information 16 Checking Unit and Field Piping for Leaks 16 Freeze Protection oreet One a Rete ate Moe oed uae xat iod On RUM Se TSS 17 Corrosion Protection 0 00 cee eee ns 17 System bela Sees 17 A 1 6 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Table 12 Table 18 FIGURES Indirect and Direct system configuration 5 5 1 placement over cold 18 4 XDO16 spacing horizontal and vertical 0 0 0 ccc eee eee eens 5 Positioning XDV on top 6 Piping for XD
14. C or lower dew point Electrical Requirements Input Voltage 1 ph 60Hz 120V Input wiring configuration 120V Line Neutral Ground Input Power Connections Terminal blocks provided on unit Full Load Amps 3 1A 120V Power consumption nominal 374 Watts Power optional lighting fixture 0 9A per 120V light fixture 0 4A per 277V light fixture Dimensions inches mm Width 72 1828 8 Depth 24 609 6 Height 22 1 2 571 5 Weight Ibs kg Unit only 150 68 Shipping weight 238 108 Installed with coolant without options 155 70 Number of Fans 1 Audible noise 84 dBa sound power at full fan speed Airflow nominal ft min m hr 2700 4587 Pipe connections XD Coolant Supply from XDP XDChiller 1 2 OD Cu XD Coolant Return to XDP XDChiller 7 8 OD Cu Serviceable Parts Fan and electrical components Exterior finish bottom sides front and rear Black matte finish heat fused powder coat Exterior finish top Hot dipped galvanized steel Options Lighting fixtures ship loose 2 XDO16s per lighting unit 120V or 277V 4 standard fluorescent tubes not provided Condensate sensing factory installed Dry contact outgoing signal 12 Specifications Table 11 Liebert specifications Cooling Capacity Nominal 46 tons 160kW with
15. P XDC used with XDO or units 7 Hydraulic schematic noth att cose wi bt ce di ee eat se duin 8 Bypass flow controller arrangement 9 Bypass flow controller details amp 9 TABLES Calculating quantity and spacing of XDO16 modules 5 Determine required number of XDV 6 Supply return pipe sizes equivalent lengths 0 ccc cet eens 7 Bypass flow controllers required XDO unit 8 Coolant volume calculations XDP XDC with XDV systems 10 Coolant volume calculation XDP XDC with XDO16 systems 10 Indoor unit refrigerant charge R 407C 00 eee has 11 Outdoor condenser charge R 407C 11 Liquid line charge R 407C refrigerant per 100 ft 30 m of Type L copper tube 11 Liebert XDO16 specifications hahaha 12 Liebert specifications 0 eee eee een eens 13 Liebert 14 Liebert XDP specifications 15 System Description 1 0 SYSTEM DESCRIPTION The Liebert XD family of cool
16. Ret XD Coolant Ties Piping gt O or XDV l XDP XDC XDPs pump coolant to XDO and XDV modules isolate coolant from building chilled water supply 2 8 Other XD Piping Design Factors 2 9 Slope The main supply and return lines to and from the XDP XDC must be sloped downward toward the XDP XDC at a rate of 1 per 10 feet 25 4mm per 3m of pipe run Horizontal connector lines should also be sloped downward from the cooling modules toward the main supply and return lines Insulation AIl piping XD Coolant and Chilled Water should be insulated Bypass Flow Controllers To ensure the XDP XDC pumps operate within the optimum range some installations require one or more bypass flow controller s These devices are added to the field piping and simulate the flow of additional cooling modules Each bypass flow controller should be installed with one shutoff valve to allow the controller to be dis abled when cooling modules are added to an XD system Bypass flow controllers may be placed anywhere in the field piping but should be placed in a conve nient accessible location Piping details of the bypass flow controller are shown in Figures 7 and 8 Refer to Table 4 to determine the number of bypass flow controllers needed based on the total nomi nal cooling capacity of the cooling modules in each XD system Table 4 Bypass flow controllers required per XDO unit Number Size of Bypas
17. ction A1 5 A 1 6 CAUTION Cooling units and their pipes must be protected 1f they might be exposed to freezing temperatures This is required even for units taken out of service and placed in storage Some liquid will remain in the system even after rigorous attempts to drain the units When the field piping or unit might be exposed to freezing temperatures charge the system with the proper percentage of glycol and water for the coldest design ambient temperature This is required to protect the system piping and unit from freezing and rupturing Some liquids will remain in the sys tems even after they are drained and might freeze without the proper water and glycol mixture Automotive antifreeze is unacceptable and must NOT be used in any glycol fluid system Corrosion Protection Liebert systems contain iron and copper alloys that require protection from corrosion Contact a local water consultant regarding water quality corrosion and freeze protection requirements Read and follow individual unit installation instructions for precautions regarding fluid system design material selection and use of field provided devices Water chemistry varies greatly by location as do the required additives called inhibitors that reduce the corrosive effect of the fluids on the piping systems and components The chemistry of the water used must be considered because water from some sources may contain corrosive elements that reduce the effecti
18. ector actual length per foot of 1 1 8 OD copper tubing XDO16 return connector actual length Amount of XD Coolant needed for ONE XDO16 XDP system Verify that the coolant volume of the XD system with the longest piping length is within the allowable limit If the allowable limit is exceeded the XDP must be moved closer to the cooling modules 10 Designing an XD Solution 2 10 2 XDC DX R 407c Circuit Volume Air Cooled Units 2 11 2 12 Weigh in the calculated charge based on Tables 7 8 and 9 Table 7 Indoor unit refrigerant charge R 407C Model 60 Hz Charge Circuit Ib kg XDC160 4 5 2 0 Table 8 Outdoor condenser charge R 407C Model Charge Circuit Ib kg CDL830 182 82 6 CSL616 254 115 2 Table 9 Liquid line charge R 407C refrigerant per 100 ft 30 m of Type L copper tube O D Liquid Line Hot Gas Line inches Ib kg Ib kg 3 8 37 1 7 1 2 6 9 3 1 5 8 11 0 5 0 2 2 1 0 3 4 15 7 7 1 3 1 1 4 7 8 23 0 10 4 4 5 2 0 1 1 8 39 3 17 8 7 8 3 5 1 3 8 59 8 27 1 11 8 5 4 1 5 8 16 7 7 6 Chilled Water Piping The XDP is offered only with a two way chilled water control valve Some applications may require the use of a pressure activated bypass valve to prevent dead heading of the chilled water pump This bypass valve must be specified by the engineer responsible for design of the chilled water field piping system
19. ems that include Liebert chilled water hot water condenser water or glycol GLYCOOL and drycooler cir cuits A1 2 General Guidelines and Information Equipment damage and personal injury can result from improper piping installation leak check ing fluid chemistry and fluid maintenance Follow local piping codes safety codes and Liebert unit installation and maintenance instruc tions Qualified personnel must install and inspect system piping Contact a local water consultant regarding water quality corrosion protection and freeze protec tion requirements Units may be shipped with a nitrogen holding charge A 1 3 Checking Unit and Field Piping for Leaks Liebert units fluid systems are checked at the factory for leaks but the unit s fluid circuits and field installed piping should be checked at installation for leaks Liebert recommends following these guidelines for testing a Liebert unit for leaks 1 3 1 Leak Check XDP Chilled Water Side Isolate the unit using field installed shutoff valves Use fluid for pressure testing if possible dry seals in fluid valves and pumps may not hold a high gas pressure If not using liquid for pressure testing The maximum recommended pressure is 30 psig 2 bars of dry nitrogen Verify the system s tightness by either pressure decay over time lt 2 psig hour 0 3 bars hour OR sensing a tracer gas with suitable instrumentation 1 3 2 Leak Check XDP XDC R
20. he room kW A Reserve capacity needed B 10 to 25 of A is recommended Required cooling capacity A B Existing planned Liebert Deluxe unit sensible capacity D E Required XD system cooling capacity C D F Number of XDOs required E 16 rounded up G Number of XDPs required F 10 rounded up Room area square feet H Area served by each XDO F Spacing of cold aisles center to center typically 12 16 ft J 3 7 to 4 9m K Spacing between each XDO I J 2 Required XD system cooling density E H L OK if under 640 otherwise additional cooling is required from Liebert Deluxe units 2 4 2 Determining Vertical Placement of XDOs Above the Cold Aisle In the maximum density configuration the XDOs should be placed between 18 and 24 inches 457 609mm above the equipment cabinets In some cases where the required density is less the front to rear spacing of XDOs in a row will be increased To ensure coverage of the wider spaces between the XDO units the vertical distance between the cabinets and the XDOs should be increased However the recommended maximum height of the XDO above the cabinets is 30 inches See Figures 3 Figure 3 XDO16 spacing horizontal and vertical Pairs of XDO16 modules above critical equipment Front to rear spacing of hm pairs of XDO16 modules gt XDO16 height above equipment to be cooled
21. heat loads Refer to the Deluxe System 3 Technical Data Manual SL 18100 for additional installation and appli cation guidelines that apply to all critical space cooling applications 2 4 Determine Cooling Requirements and Select XD System 1 Calculate the total cooling required 2 Determine placement of the XD units 3 Determine required pipe sizes 4 Calculate the coolant volume of the XD systems 5 Complete design details including electrical mounting piping etc 2 2 Calculate the Heat Load to be Handled by XD System When designing a cooling solution using the XD system the initial steps are similar to those required to cool a conventional critical space The total heat load must be calculated including sensible and latent cooling requirements These should be increased by the reserve capacity needed for pull down situations where the room temperature must be reduced and to provide for unexpected increases in heat load NOTE Reserve capacity is distinct from redundant capacity in that redundant capacity may or may not be available concurrently with normal operating capacity Reserve capacity is available concurrently with normal operating capacity The next step is to determine how much of the required cooling capacity is to be provided by Liebert Deluxe units If the facility is new up to 150 watts per square foot of cooling can be obtained from Lie bert Deluxe units In existing facilities such factors as raised floor height u
22. ing units delivers efficient sensible cooling to high heat environ ments including computer racks and hot zones in a data center or computer room Systems combining XDO XDV XDP XDC and XDA units can remove in excess of 500 watts of heat per square foot This heat removal capacity is achieved without sacrificing the Liebert XD units high energy efficiency The XD family maintains this energy efficiency by employing the heat absorption properties of a liq uid Coolant is pumped as a liquid becomes a gas within the heat exchangers of the cooling modules either the XDO or XDV and then is returned to the pumping unit where it condenses to a liquid This eliminates the compression cycle required by traditional systems And if a leak were to occur the environmentally friendly coolant would escape as a gas causing no harm to critical equipment Liebert XD systems are available in Direct and Indirect configurations differentiated essentially by the location of the pumping unit The Indirect system uses a pumping unit to control and circulate the XD Coolant In the Direct system the pumping functions are incorporated in the chiller Figure 1 Indirect and Direct system configuration 1 1 Indirect XD chilled System Configuration Water XDPs pump coolant to XDO Supply and XDV modules isolate coolant from building chilled X 0 XDOoXDV S water supply and maintains coolant above dew point Direct XD System Configuration
23. is space as long as the amount of coolant in any one system does not exceed 800 lbs System Description Liebert XDO Overhead Cooling Module The XDO ceiling mounted cooling module draws in hot air rising from densely populated rack enclo sures passes it over the XDO s coils and exhausts cooled air downward into the cold aisle Liebert XDV Vertical Rack Mounted Cooling Module The XDV is installed on top of a rack enclosure It can be set up in either of two ways The XDV can take hot air from an equipment enclosure cool the air and discharge it into the room OR The XDV can draw hot air from the room cool the air and discharge the cool air into the cold aisle Liebert XDP Pumping Unit The XDP isolates the building s chilled water circuit from the XD Coolant circuit Serving as an intermediary in Indirect systems the XDP circulates coolant to XDV or XDO modules while prevent ing condensation by maintaining the coolant s temperature above the dew point Liebert XDC Chiller The XDC is an indoor chiller that connects directly to the XDO or XDV units and provides coolant cir culation and control The XDC keeps the XD Coolant fluid temperature above the dew point and elim inates the need for a separate pumping unit in the Direct system configuration Liebert XDA Air Flow Enhancer Not covered in this System Configuration amp Design document The XDA is a fan unit that boosts the airflow through densely popula
24. nder floor obstructions or other limitations may reduce this to less than 50 watts per square foot Once the total required sensible cooling capacity is known subtract the sensible cooling portion to be provided by Liebert Deluxe units This yields the cooling capacity to be provided by the XD system Designing an XD Solution 2 3 2 4 2 4 1 Selecting XDO or XDV Modules The next step is to select XDO or XDV cooling modules to be configured into the solution An XDO and and an XDV cannot be connected to the same XDP XDC However a complete extreme density cooling solution can utilize XDO and XDV units connected to separate XDP XDCs Generally the XDO is selected for use in new installations or renovations where the unit can be installed on the ceiling or in the overhead space The XDV is designed to permit mounting directly on top of an equipment cabinet for ease of installa tion in existing facilities The XDV may also be suspended from overhead using suitable mounting methods Airflow Requirements for XD Solutions Computer manufacturers typically specify a temperature change from intake to exhaust delta T of 18 27 F 10 15 C for the air passing through a rack enclosure The heat generated by electronic equipment combined with the tight quarters of equipment cabinets mean that high volumes of air must move through an enclosure to meet this cooling specification An XD system can supply the cooled air to satisfy this
25. recommended pipe sizes and Figure 6 for piping segment locations Table 3 Supply return pipe sizes equivalent lengths Key to Piping Size Pipe Run Pipe Function in Figure 6 Schematic Equivalent Lengths XDP XDC supply line from XDP XDC A 1 1 8 OD for lengths up to 60 feet supply to farthest XDO16 or XDV 1 3 8 OD for lengths over 60 but less than 175 feet XDP XDC return line from XDP XDC B 2 1 8 OD for lengths up to 60 feet return to farthest XDO16 or XDV 2 5 8 OD for lengths over 60 but less than 175 feet From XDO16 supply to supply line of C 1 2 OD for lengths up to 10 feet XDP XDC 7 8 OD for lengths over 10 but less than 25 feet From XDO16 return to return line of D 7 8 OD for lengths up to 10 feet XDP XDC 1 1 8 OD for lengths over 10 but less than 25 feet From XDV supply to supply line of C 1 2 OD for lengths up to 6 feet XDP XDC 5 8 OD for lengths over 6 but less than 35 feet From XDV return to return line of D 5 8 OD for lengths up to 6 feet XDP XDC 7 8 OD for lengths over 6 but less than 35 feet For additional information about piping connections see the unit s user manual XDP 16641 XDC SL 16671 XDO16 SL 16661 and XDV SL 16621 CAUTION To minimize the amount of XD Coolant required do NOT oversize the piping Designing an XD Solution Figure 6 Hydraulic schematic Building Chilled T Supply Water m Li Supply XDP XDC D
26. rt com Monitoring 800 222 5877 monitoring liebert com Outside the US 614 841 6755 Single Phase UPS 800 222 5877 upstech liebert com Outside the US 614 841 6755 Three Phase UPS 800 543 2378 powertech liebert com Environmental Systems 800 543 2778 Outside the United States 614 888 0246 Locations United States 1050 Dearborn Drive P O Box 29186 Columbus OH 43229 Italy Via Leonardo Da Vinci 8 Zona Industriale Tognana 35028 Piove Di Sacco PD 39 049 9719 111 Fax 39 049 5841 257 Asia 23F Allied Kajima Bldg 138 Gloucester Road Wanchai Hong Kong 852 2 572 2201 Fax 852 2 831 0114 EMERSON
27. s Flow XDO XDV Units Controllers XDV8 4 11 2 12 15 16 20 0 XDO16 2 5 2 6 7 1 8 10 0 Minimum of four XDV8s required for XDP based systems Minimum of eight XDV8s required for XDC based systems Minimum of two XDO16s required for XDP based systems Minimum of four XDO16s required for XDC based systems Designing an XD Solution Figure 7 Bypass flow controller arrangement Return Main 7 8 Refrigerant Grade Full Port Ball Valve Field Supplied and Installed Il LL TFL Flow Direction Bypass Flow Controller Field Installed Supply Main Figure8 Bypass flow controller details dimensions Q gt 102mm n 7 8 2 2mm ID gt HHI Designing an XD Solution 2 10 Determining Coolant Volume After the preliminary system design is completed Tables 5 through 9 may be used to determine the amount of coolant required Perform the calculation below for each XD system being configured 4 NOTE All lengths in the tables below Tables 5 and 6 are actual pipe lengths not equivalent pipe lengths 2 10 1 XDP XDC Pumped R 134a Circuit Volume Table 5 Coolant volume calculations XDP XDC with XDV systems 145 Ibs R 134a per XDP includes charge of one XDP while running 1 46 0 45 0 68 0 28 0 43 0 08 0 13 0 02 0 04 Table 6 1
28. ted enclosures removing hot spots from within the racks One or two units can be mounted on most rack enclosures Designing an XD Solution 2 0 DESIGNING AN XD SOLUTION Liebert XD systems are intended for use with precision air conditioning equipment such as the Lie bert Deluxe System 3 The precision air conditioning equipment is required to control the room s humidity and to filter the air The XD systems provide efficient highly effective heat removal sensible cooling only and provide no dehumidification The XD control system maintains the coolant temperatures just above the dew point of the space to prevent condensation Since the capacity of the system is limited by the dew point in the space sufficient dehumidification and an adequate vapor barrier must be provided to maintain the dew point at or below the level necessary to achieve the required capacity In their maximum density configurations the XDO XDV system can provide more than 500 watts per square foot of cooling capacity Peak loads in the immediate vicinity of an XD cooling module can be higher With precision cooling unit capacities in the range of 50 to 150 watts per square foot the total cooling density of an XD system combined with a precision cooling unit can be in excess of 700 watts per square foot The Liebert XD system is optimized for hot aisle cold aisle equipment configurations the industry s most highly recommended method for dealing with extremely high
29. veness of the inhibitors Surface waters that are classified as soft and are low in chloride and sulfate ion content should be used if at all possible Proper inhibitor maintenance must be performed to prevent corrosion of the system Consult the manufacturer of the glycol used for testing and maintenance of inhibitors Commercial ethylene glycol Union Carbide Ucartherm Dow Chemical Dowtherm SR 1 and Texaco E G Heat Transfer Fluid 100 when pure is generally less corrosive to the common metals of construction than water itself Ethylene glycol will however assume the corrosivity of the water with which it is prepared and may become increasingly corrosive with use if not properly treated with inhibitors Keep the unit switched ON and the system pump operating Idle fluid allows the collection of sedi ment which prevents the formation of a protective oxide layer on the inside of tubes System Maintenance Establish and follow a schedule for checking the Liebert unit and system for fluid leaks and proper fluid chemistry Fluid system quality remains a requirement throughout the life of the piping system System fluid conditions must be evaluated on a maintenance schedule and treated to provide a stable fluid chemis try in any piping loop that contains iron and copper alloys 17 Guidelines for Leak Testing and Fluid Requirements of Liebert Systems Using Water or Glycol 18 0 Liebert Keeping Business in Business
30. xtures are used in place of 100 water Electrical requirements Input 208V model 3 phase 60 Hz 460V model 3 phase 60 Hz Full Load Amps 208V model 4 Amps 460V model 2 1 Amps Dimensions inches mm Height Unit only 76 1930 does not include pipe connections Height As shipped 83 2108 Width 37 940 Depth 30 762 Weight Ibs kg Unit only 855 388 Shipping weight 960 435 Installed with coolant and chilled water 1025 465 Pipe connections XD Coolant supply to XDO or XDV 1 1 8 OD Cu XD Coolant return from XDO or XDV 2 1 8 OD Cu Chilled water supply and return 2 5 8 OD Cu Control valve 2 way 2 nominal Pressure drop chilled water side 20 PSIG with 140 gpm 5301 water flow rate control valve fully open Temperature rise chilled water side F C 8 0 4 4 with rated flow Number of XDOs connected Maximum 10 minimum 2 for XDO16 Number of XDVs connected Maximum 20 Minimum 4 Cabinet exterior finish Black matte finish heat fused powder coat 15 Guidelines for Leak Testing and Fluid Requirements of Liebert Systems Using Water or Glycol APPENDIX 1 0 GUIDELINES FOR LEAK TESTING AND FLUID REQUIREMENTS OF LIEBERT SYSTEMS USING WATER OR GLYCOL A1 1 Scope These guidelines apply to the field leak checking and fluid requirements for field piping syst
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