Emerson Liebert Xtreme Density User Manual
Precision Cooling
For Business-Critical Continuity™
Liebert® Xtreme Density
System Design Manual
™
TABLE OF CONTENTS
1.0 SYSTEM DESCRIPTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1
1.1 European Union Fluorinated Greenhouse Gas Requirements . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 Direct and Indirect System Configurations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3 Liebert XDO—Overhead Cooling Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.4 Liebert XDV—Vertical, Above-Cabinet Cooling Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.5 Liebert XDH—Horizontal Cooling Module . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.6 Liebert XDCF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.7 Liebert XDA—Air Flow Enhancer. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.8 Liebert XDP—Pumping Unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.8.1 Liebert XDP Minimum Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
1.9 Liebert XDC—Refrigerant Chiller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.9.1 Liebert XDC Minimum Load . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
1.10 Liebert XD Piping. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
1.10.1 Liebert XD Field Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
2.0 STARTING A NEW EQUIPMENT COOLING PROJECT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.1 Determining Cooling Equipment Needs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
2.2 Implementing a Hot-Aisle/Cold Aisle Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.0 DESIGNING A LIEBERT XD SOLUTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Determine Cooling Requirements and Select Liebert XD System . . . . . . . . . . . . . . . . . . . . 13
3.2 Calculate the Heat Load to be Handled by Liebert XD System . . . . . . . . . . . . . . . . . . . . . . 13
3.3 Selecting Liebert XD Cooling Modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.4 Airflow Requirements for Liebert XD Solutions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.5 Configuring a Liebert XD System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
3.5.1 Number of Modules Supported by a Liebert XDP or Liebert XDC . . . . . . . . . . . . . . . . . . . . . 14
3.6 Liebert XDO Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.6.1 Determining Spacing of Liebert XDOs in an Aisle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
3.6.2 Determining Vertical Placement of Liebert XDOs Above the Cold Aisle . . . . . . . . . . . . . . . . 16
3.7 Liebert XDV Unit Placement. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
3.8 Liebert XDCF Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.9 Liebert XDH Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.10 Liebert XDP/Liebert XDC Placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.11 Examples of Expansion and Interlaced Connection of Liebert XD Cooling Modules. . . . . . 20
3.12 Liebert XD Refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.13 Liebert XD Piping System Design . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
3.14 Liebert XD Piping Slope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.15 Bypass Flow Controllers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.16 Determining Refrigerant Volume . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.16.1 Liebert XDP/Liebert XDC Pumped R-134a Circuit Volume . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.16.2 Calculating Refrigerant Charge—Example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.17 Liebert XDC DX R-407c Circuit Volume—Air Cooled Units . . . . . . . . . . . . . . . . . . . . . . . . . 28
3.18 Chilled Water Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
3.19 Electrical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
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3.20 Display Panel and Remote Temperature/Humidity Sensor Locations . . . . . . . . . . . . . . . . . 29
4.0 LIEBERT XD COOLING MODULES—LIEBERT XDO, LIEBERT XDV, LIEBERT
XDH AND LIEBERT XDCF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .30
4.1 Liebert XDO Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.1.1 Optional Features Liebert XDO. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
4.2 Liebert XDV Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
4.2.1 Optional Features—Liebert XDV . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.3 Liebert XDCF Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.4 Liebert XDCF Mechanical Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
4.5 Liebert XDCF Installation Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.6 Liebert XDCF Piping Connection Methods and Points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
4.6.1 Header System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
4.7 Liebert XDH Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
4.7.1 Optional Features—Liebert XDH . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
4.7.2 Piping Connections to Liebert XDP or Liebert XDC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
4.8 Liebert XD Flex Pipe Kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
4.9 Liebert XD Piping Dimensions and Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
4.9.1 Piping Installation Method prefabricated headers. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
4.10 Liebert XDP Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
4.11 Liebert XDC Standard Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
4.11.1 Liebert XDC Optional Features. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
5.0 SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
FIGURES
Figure 1 Pressure enthalpy diagram - refrigerant . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Figure 2 Direct system configuration—hydraulic system diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Figure 3 Indirect system configuration—hydraulic system diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Figure 4 Suspended Liebert XDO modules in hot aisle-cold aisle arrangement . . . . . . . . . . . . . . . . . . . . . . 3
Figure 5 Top-mounted Liebert XDV modules with fixed piping in hot aisle-cold aisle arrangement. . . . . . 4
Figure 6 Top-mounted Liebert XDV modules with flexible piping in hot aisle-cold aisle arrangement. . . . 4
Figure 7 Liebert XDH—horizontal cooling module in hot aisle-cold aisle arrangement . . . . . . . . . . . . . . . . 5
Figure 8 Liebert XDCF units on BladeFrame EX cabinets . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Figure 9 Liebert XDA—air flow enhancer—on Liebert Foundation enclosure . . . . . . . . . . . . . . . . . . . . . . . 7
Figure 10 Liebert XDP pumping unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Figure 11 Liebert XD Chiller unit. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Figure 12 Liebert XD connection port kit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Figure 13 Hot aisle-cold aisle arrangement with under-floor source . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
Figure 14 Liebert XDO placement over cold aisle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Figure 15 Liebert XDO spacing—horizontal and vertical . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Figure 16 Positioning Liebert XDV on top of cabinet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Figure 17 Liebert XDCF unit mounting locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
Figure 18 Liebert XDH placement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
Figure 19 Liebert XDV units mounted on racks emitting 3kW of heat, top view . . . . . . . . . . . . . . . . . . . . . 20
Figure 20 Liebert XDV units mounted on racks emitting 5kW of heat, top view . . . . . . . . . . . . . . . . . . . . . 20
Figure 21 Liebert XDV units mounted on racks emitting 8kW of heat top view . . . . . . . . . . . . . . . . . . . . . . 21
Figure 22 Liebert XDV units mounted on racks emitting 16kW of heat top view . . . . . . . . . . . . . . . . . . . . . 21
Figure 23 Piping for Liebert XDP/Liebert XDC used with Liebert XD cooling units . . . . . . . . . . . . . . . . . . 23
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Figure 24 Hydraulic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
Figure 25 Bypass flow controller details, dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 26 Bypass flow controller arrangement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 27 Bypass flow controller piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
Figure 28 Dimensional data—Liebert XDO hard-piped units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 29 Dimensional data—Liebert XDO with pre-charged option . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Figure 30 Liebert XDO internal mounting location. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Figure 31 Liebert XDO top and front electrical access points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Figure 32 Liebert XDV dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
Figure 33 Liebert XDV dimensions with one-shot connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Figure 34 Liebert XDV electrical connections for CE approved units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Figure 35 Liebert XDV electrical connections for CSA-approved units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Figure 36 Suspending single Liebert XDV from Unistruts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 37 Suspending single Liebert XDV from the roof structure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 38
Figure 38 Alternative mounting methods—mounting multiple Liebert XDV units . . . . . . . . . . . . . . . . . . . 39
Figure 39 Liebert XDCF hydraulic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Figure 40 Overall dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 41
Figure 41 Liebert XDCF unit mounting locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Figure 42 Liebert XDCF supply and return piping access points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
Figure 43 Liebert XDH dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 44 Supply and return piping connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Figure 45 Hard-pipe connection diagram for Liebert XDV, Liebert XDO and Liebert XDH
cooling modules . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 45
Figure 46 Two-port prefabricated piping for Liebert XD cooling modules . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Figure 47 Four-port prefabricated piping for Liebert XD cooling modules . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Figure 48 Five-port prefabricated piping for Liebert XD cooling modules . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Figure 49 Ten-port prefabricated piping for Liebert XD cooling modules . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Figure 50 Liebert XDP dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Figure 51 Liebert XDP piping access points and external features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Figure 52 Front view of Liebert XDP and electrical enclosure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Figure 53 Liebert XDP electrical enclosure knockout locations for field wiring . . . . . . . . . . . . . . . . . . . . . . 53
Figure 54 Liebert XDP 60Hz high voltage connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Figure 55 Liebert XDP 50Hz high voltage connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 54
Figure 56 Liebert XDC dimensional data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Figure 57 Liebert XDC piping locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Figure 58 Positioning a water/glycol Liebert XDC for placement on a floor stand . . . . . . . . . . . . . . . . . . . . 57
Figure 59 Piping locations—floor stand and valve assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
Figure 60 Front view of Liebert XDC and electrical enclosures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 59
Figure 61 Liebert XDC electrical enclosure knockout locations for field wiring . . . . . . . . . . . . . . . . . . . . . . 59
Figure 62 Liebert XDC high voltage connections—primary disconnect switch, 60Hz models . . . . . . . . . . . 60
Figure 63 Liebert XDC high voltage connections—primary disconnect switch, 50Hz models . . . . . . . . . . . 60
Figure 64 Liebert XDC high voltage connections—secondary disconnect switch, 60Hz models . . . . . . . . . . 61
Figure 65 Liebert XDC high voltage connections—secondary disconnect switch, 50Hz models . . . . . . . . . . 61
Figure 66 Liebert XDC heat rejection electrical connection points. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Figure 67 Liebert XDC electrical enclosure knockout locations for Extra Low Voltage connections . . . . . . 62
Figure 68 Liebert XDC Extra Low Voltage field connections points . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
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TABLES
Table 1 Liebert XD field-installed port kits header connection size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Table 2 Maximum and minimum modules supported by a Liebert XDP or Liebert XDC . . . . . . . . . . . . . 14
Table 3 Calculating quantity and spacing of Liebert XDO modules (example below is Liebert
XDO20) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Table 4 Determine required number of Liebert XDV modules (example below is Liebert XDV10) . . . . . 17
Table 5 Supply, return pipe sizes for refrigerant loop . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
Table 6 Bypass flow controllers for Liebert XDC- or Liebert XDP-based systems . . . . . . . . . . . . . . . . . . . 24
Table 7 System R-134a charge for a Liebert XDP/Liebert XDC with any model Liebert XDH/
Liebert XDO/Liebert XDV/Liebert XDCF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 8 System refrigerant charge for the supply and return mains . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 9 R-134a refrigerant charge for hard-piped connector lines to and from any model
Liebert XDH/Liebert XDO/Liebert XDV/Liebert XDCF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Table 10 R-134a refrigerant charge for Flex Pipe connector lines to and from any model
Liebert XDO/Liebert XDH/Liebert XDV/Liebert XDCF . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Table 11 Calculating refrigerant charge—example . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 12 Worksheet to calculate refrigerant charge . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 13 Indoor unit refrigerant charge—R-407c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
Table 14 Air cooled systems - liquid line charge - R-407c refrigerant per 100 ft (30 m) of Type "L"
copper tube . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 15 Indoor water/glycol cooled module – R-407c refrigerant charge . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 16 Outdoor condenser charge—R-407c . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
Table 17 Liebert XD Flex Pipe assemblies, supply and return . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46
Table 18 Two-port prefabricated piping legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Table 19 Four-port prefabricated piping legend. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Table 20 Five-port prefabricated piping legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
Table 21 Ten-port prefabricated piping legend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Table 22 Liebert XDP dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Table 23 Unit piping outlet connection sizes, inches, OD Cu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Table 24 Liebert XD Chiller dimensions, weight . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 55
Table 25 Liebert XD Chiller piping connection sizes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 56
Table 26 Liebert XDC Water/Glycol Piping Connection Sizes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
Table 27 Liebert XDC160 specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
Table 28 Floor stand specifications—water-cooled Liebert XDC. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Table 29 Floor stand specifications—Liebert XDC with 40% propylene glycol . . . . . . . . . . . . . . . . . . . . . . 65
Table 30 Floor stand specifications—Liebert XDC with 40% ethylene glycol . . . . . . . . . . . . . . . . . . . . . . . 66
Table 31 Liebert XDP160 specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 67
Table 32 Liebert XDO16 specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Table 33 Liebert XDO20 specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 69
Table 34 Liebert XDO20 dimensions—domestic and export . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Table 35 Liebert XDO16 dimensions—domestic and export . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 70
Table 36 Liebert XDV8 specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 71
Table 37 Liebert XDV10 specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Table 38 Liebert XDV8 dimensions—domestic and export . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 39 Liebert XDV10 dimensions—domestic and export . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Table 40 Liebert XDCF specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Table 41 Liebert XDH specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 74
73
iv
1.0 SYSTEM DESCRIPTION
Enthalpy
Pressure
Liquid Liquid/Vapor Mix Vapor
Traditional
Vapor
Compression
Cycle
Pumped
Two -Phase
Cycle
XD CoolFrame, XDH,
XDO, XDV
The Liebert XD™ family of cooling units delivers efficient, sensible cooling to high-heat environments. Liebert XD systems are designed to cool computer racks and hot zones in a data center or computer room without taking up expensive floor space for cooling components.
The Liebert XD family includes:
• Liebert XDC—Liebert XD Chiller; cools and pumps refrigerant to cooling modules
• Liebert XDP—Liebert XD Pumping unit; pumps refrigerant to cooling modules
• Liebert XDA—mounts on the rear of the equipment cabinet
• Liebert XDCF—mounts on the rear of an Egenera BladeFrame EX cabinet
• Liebert XDH—Liebert XD Horizontal row cooler; integrated into hot aisle-cool aisle room layout
• Liebert XDO—Liebert XD Overhead unit, suspended from the ceiling structure
• Liebert XDV—Liebert XD Vertical unit; mounted on top of the equipment cabinet or suspended
from the ceiling structure
Systems combining Liebert XDO and Liebert XDV units can remove more than 20 kW (5.7 tons) of
heat per cabinet. A set of Liebert XDCF modules also can remove 20kW (5.7 tons) of heat from an
Egenera BladeFrame EX cabinet. A system with Liebert XDH units can remove more than 30kW
(8.5tons) of heat per rack.
For minimum Liebert XDP and Liebert XDC load recommendations, see 1.8.1 - Liebert XDP Mini-
mum Load; 1.9.1 - Liebert XDC Minimum Load; and Tables 27 and 31.
System Description
The Liebert XD system also performs at high efficiency rates. Properly spaced cooling modules and
the Liebert XD system’s fluid phase change technology, combine to reduce a Liebert XD system’s
energy consumption to at least 27 percent less than a traditional cooling system.
The Liebert XD family maintains this energy efficiency by employing the heat absorption properties
of a liquid (pumped refrigerant) through a phase change. Refrigerant is pumped as a liquid, becomes
a gas within the heat exchangers of the cooling modules (either the Liebert XDCF, Liebert XDH, Liebert XDO or Liebert XDV) and then is returned to either the Liebert XDP or Liebert XDC 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 refrigerant would escape as a gas, causing no harm
to critical equipment (see Figure 1). Because no compressor is used in the circuit, no oil is needed.
Figure 1 Pressure enthalpy diagram - refrigerant
1
1.1 European Union Fluorinated Greenhouse Gas Requirements
Pump ed
Refrigerant
Supply Piping
Return Pipi ng
Pump ed
Refrigerant
Liebert XDC
Liebert XDC
Liebert XD
Cooling Module*
Liebert Heat
Rejection
Air Cooled or
Water/Glycol
Cooled
Liebert XD
Cooling Module*
Liebert XD
Cooling Module*
Liebert XD
Cooling Module*
* Liebert XDCF,
Liebert XDH, Liebert
XDO or Liebert XDV
Direct Liebert XD System Configuration
Pumping and control are performed by chiller.
Liebert
XDP
Liebert XD
Cooling Module *
Liebert XD
Cooling Module *
Building
Chille d
Water
Liebert
XDP
Liebert XD
Cooling Module *
Supply Piping
Return Piping
Pumped
Refrigerant
Pumped
Refrigerant
* Liebert XDCF,
Liebert XDH, Liebert
XDO or Lie bert XD V
Indirect Liebert XD System Configuration
Liebert XDPs pump refrigerant to Liebert XDCF, Liebert XDH, Liebert XDO or Liebert XDV
modules, isolate refrigerant circuit from building chilled water supply with an internal
heat exchanger and maintains refrigerant temperature above the actual dew point.
Stationary air conditioning, refrigeration, heat pump equipments and stationary fire protection systems in the European Community market and operating with fluorinated greenhouse gases (f-gas),
such as R407C, R134a, R410A, must comply with the F-Gas Regulation: (EC) No. 842/2006 (F-gas).
The regulation prohibits, among other actions, venting fluorinated greenhouse gases to the atmosphere.
The F-Gas Regulation requires operators to use use all measures that are technically feasible and do
not entail disproportionate cost to prevent leakage of these gases, to test for leakage regularly and to
recover f-gas before disposing of equipment, as well as during service and maintenance.
Refer to the full regulation for additional details.
1.2 Direct and Indirect System Configurations
Liebert XD systems are available in Direct and Indirect configurations—differentiated essentially
by the method of heat rejection (see Figures 2 and 3). The indirect system uses a pumping unit connected to a building chilled water system to control and circulate the refrigerant. In the direct system,
the pumping functions are incorporated in the chiller, which must be connected to a separate heat
rejection system.
Figure 2 Direct system configuration—hydraulic system diagram
System Description
Figure 3 Indirect system configuration—hydraulic system diagram
2
1.3 Liebert XDO—Overhead Cooling Module
Cold Aisle
Cold Aisle
Cold Aisle
Hot Aisle
Hot Aisle
Hot aisles and cold aisles
alternate, taking advantage
of airflow properties to
increase cooling efficiency
The Liebert XDO ceiling-mounted cooling module draws in hot air rising from densely populated cabinets, passes it over the Liebert XDO’s coils and exhausts cooled air downward into the cold aisle. The
unit is available with optional, flexible metal pipes with quick-connect couplings at each end for easy
connection to the refrigerant distribution pipes.
Figure 4 Suspended Liebert XDO modules in hot aisle-cold aisle arrangement
System Description
3
1.4 Liebert XDV—Vertical, Above-Cabinet Cooling Module
Hot aisles and cold aisles
alternate, taking advantage
of airflow properties to
increase cooling efficiency
Cold Aisle
Cold Aisle
Cold Aisle
Hot Aisle
Hot Aisle
Hot aisles and cold aisles alternate,
taking advantage of airflow properties
to increase cooling efficiency
Cold Aisle
Cold Aisle
Hot Aisle
Hot Aisle
The Liebert XDV is installed on top of or above a rack enclosure. It is available with optional flexible
metal pipes with automatic shutoff with quick-connect couplings at the ends for easy connection to
the refrigerant distribution pipes. The Liebert XDV may be set up in either of two ways:
• The Liebert XDV can take hot air directly from an equipment enclosure, cool the air and discharge it downward into the cold aisle.
OR
• The Liebert XDV can draw hot air from the room, cool the air and discharge the cool air downward into the cold aisle.
System Description
Figure 5
Top-mounted Liebert XDV modules with fixed piping in hot aisle-cold aisle arrangement
Figure 6 Top-mounted Liebert XDV modules with flexible piping in hot aisle-cold aisle
arrangement
4
1.5 Liebert XDH—Horizontal Cooling Module
The Liebert XDH cooling module is designed to be placed within a row of server enclosures in a
hot aisle-cold aisle arrangement. The Liebert XDH has dual refrigeration circuits and is available in a
half-rack-width unit. The Liebert XDH is intended for use with a Liebert XD pumped refrigerant cooling system, supplied by either a Liebert XDP or Liebert XDC.
The Liebert XDH is available with optional, flexible metal pipes with quick-connect couplings at each
end for easy connection to the refrigerant distribution pipes.
Figure 7 Liebert XDH—horizontal cooling module in hot aisle-cold aisle arrangement
System Description
5
1.6 Liebert XDCF
The Liebert XDCF is a self-contained module designed to cool Egenera’s BladeFrame EX cabinets and
equipment without exhausting heat into the room. Two modules (top and bottom) may be mounted on
the rear of a BladeFrame cabinet. CF modules consist of a sheet-metal frame, coil and filter dryer. It
has no moving parts and needs no electricity.
The unit is available with optional, flexible metal pipes with quick-connect couplings at each end for
easy connection to the refrigerant distribution pipes.
Figure 8 Liebert XDCF units on BladeFrame EX cabinets
System Description
6
1.7 Liebert XDA—Air Flow Enhancer
The Liebert XDA is a fan unit that boosts the airflow through densely populated enclosures, removing
hot spots from within the racks. One or two units can be mounted on the rear of most rack enclosures.
Figure 9 Liebert XDA—air flow enhancer—on Liebert Foundation enclosure
System Description
7
1.8 Liebert XDP—Pumping Unit
The Liebert XDP isolates the building’s chilled water circuit from the pumped refrigerant circuit. The
Liebert XDP circulates refrigerant to Liebert XDCF, Liebert XDH, Liebert XDO or Liebert XDV modules while preventing condensation by maintaining the refrigerant’s temperature above the dew
point. The Liebert XDP employs two sets (for redundancy) of remote sensors to determine the temperature and humidity in the air and instantly adjusts refrigerant supply temperature to compensate for
changing conditions.
1.8.1 Liebert XDP Minimum Load
The Liebert XDP’s minimum recommended operating load is 20% of system nominal capacity. For
example, a Liebert XDP160 60Hz system’s minimum load would be 32 kW. Loading below this value
can unfavorably affect system operation. Consult factory for any loading below this recommendation.
Figure 10 Liebert XDP pumping unit
System Description
8
1.9 Liebert XDC—Refrigerant Chiller
The Liebert XDC is an indoor chiller that connects directly to the Liebert XD cooling modules and provides refrigerant circulation and control. The Liebert XDC keeps the refrigerant temperature above
the dew point and eliminates the need for a separate pumping unit in the direct system configuration.
The Liebert XDC employs two sets (for redundancy) of remote sensors to determine the temperature
and humidity in the air and instantly adjusts refrigerant supply temperature to compensate for
changing conditions.
1.9.1 Liebert XDC Minimum Load
The Liebert XDC’s minimum recommended operating load is 40% of system nominal capacity. For
example, a Liebert XDC160 60Hz system’s minimum load would be 64 kW. Loading below this value
can unfavorably affect system operation. Consult factory for any loading below this recommendation.
Figure 11 Liebert XD Chiller unit
System Description
9
1.10 Liebert XD Piping
Return valve shown
Supply valve appearance
is similar, but is smaller
Liebert XD Piping is prefabricated distribution piping that is installed in anticipation of a growing system. Liebert XD cooling modules are added as required and are quickly made operational with flexible
connection piping with threaded couplings. This unique system allows the room cooling capacity to
increase to more than 30kW per rack with no additional disruptive piping installation. The flexible
connection piping also allows the cooling modules to be re-positioned without interruption in operation.
1.10.1 Liebert XD Field Piping
Flexible Piping Kit
Flex pipe kits are available in lengths of 4, 6, 8 and 10 feet (1.2, 1.8, 2.4 and 3 meters). Connection
style to the module end may be straight or 90 degrees with one-shot style couplings or removable couplings. Connection to the prefabricated piping assembly is a threaded coupler. For information on
acquiring the correct kit for your installation refer to DPN000780_Rev1, available by calling
1-800-LIEBERT and from your local Emerson Network Power representative.
Prefabricated Headers
Field piping kits are available in several versions
• 10 ft. (3.05m) with five or 10 ports
• 8 ft. (2.44m) with two or four ports
Each version is available in two pipe sizes:
• Supply pipe: 1-1/8"; return pipe: 2-1/8"
• Supply pipe: 1-3/8"; return pipe: 2-5/8"
Each kit contains supply pipe(s) and return pipe(s). Each port has a threaded coupling at the end with
automatic shutoff when disconnected. Each port also has a ball valve for manual shutoff. For more
information refer to section 4.9 - Liebert XD Piping Dimensions and Features.
System Description
Liebert XD Connection Port Kit
The connection ports in the Liebert XD Field Piping Kits are available as Liebert XD Connection Port
Kit. Each port has a threaded coupling, with automatic shutoff when disconnected, at the end. Each
port also has a ball valve for manual shutoff. Each kit contains one supply and one return port. Two
kit sizes are available:
• Supply pipe: 1-1/8"; return pipe: 2-1/8"
• Supply pipe: 1-3/8"; return pipe: 2-5/8"
Figure 12 Liebert XD connection port kit
Table 1 Liebert XD field-installed port kits header connection size
Assembly P#
183169G3 1-1/8" 2-1/8"
183169G4 1-3/8" 2-5/8"
Supply Header
Diameter
Return Header
Diameter
10
2.0 STARTING A NEW EQUIPMENT COOLING PROJECT
2.1 Determining Cooling Equipment Needs
1. Is adequate space available for a Liebert XD installation?
2. Is the hot aisle/cold aisle approach being utilized for this room design or can it
be utilized in this room design?
3. Is redundant cooling equipment required?
4. Are there access considerations for all components (possible rigging problems)
5. What heat load growth is anticipated over the next few years?
6. How are the cabinets going to be populated (density of heat generation)?
7. What monitoring requirements are desired or needed?
8. Who will be involved in this project (stakeholders)?
9. Is there existing computer room environmental cooling systems for humidity
control and filtration?
10. Is the vapor barrier sufficient?
11. Is a chilled water system available?
a. What is the system’s capacity?
b. What is the system’s chilled water supply temperature?
Starting a New Equipment Cooling Project
c. Does the chilled water supply temperature vary during the year or is the
temperature constant?
12. How much power is available for cooling equipment?
13. What is the maximum distance between the Liebert XDP/Liebert XDC unit
and the farthest Liebert XD cooling module in the proposed layout?
14. If an air cooled Liebert XDC is used – is an area available for the remote
condenser?
11
2.2 Implementing a Hot-Aisle/Cold Aisle Design
Cold air supplied
through perforated
floor tiles is drawn
into racks
Heated air expelled from
racks is drawn into
cooling unit and returned
to floor supply
A best practice is to use rows of equipment racks in an alternating arrangement of cold aisles and hot
aisles. This is best accomplished when the layout of the file-server farm area is first being planned,
and it is exceedingly more difficult to accomplish when the computer room is already populated with
operating hardware.
In the cold aisle, the equipment racks are arranged face to face so the cooling air discharged up
through the perforated floor tiles is drawn into the face of the computer hardware and exhausted out
the back of the equipment rack onto the adjacent hot aisles.
Hot aisles are literally hot because the objective of the alternating cold and hot aisle design is to separate the source of cooling air from hot air discharge which returns to the computer-room cooling unit.
Therefore, no perforated tiles should be placed in the hot aisles. as this would mix hot and cold air and
thereby lower the temperature of the air returning to the cooling units, which reduces their usable
capacity.
Figure 13 Hot aisle-cold aisle arrangement with under-floor source
Starting a New Equipment Cooling Project
12
Designing a Liebert XD Solution
3.0 DESIGNING A LIEBERT XD SOLUTION
Liebert XD systems are intended for use with precision air conditioning equipment, such as the Liebert Deluxe System/3 and Liebert DS. The precision air conditioning equipment is required to control
the room’s humidity and to filter the air.
The Liebert XD systems provide efficient, highly effective heat removal (sensible cooling only), and
provide no dehumidification. The Liebert XD control system maintains the refrigerant temperature
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.
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 heat loads.
Refer to the technical data manual of either the Deluxe System/3 (SL-18100) or the
Liebert DS (SL-18810) for additional installation and application guidelines that apply to all critical
space cooling applications.
3.1 Determine Cooling Requirements and Select Liebert XD System
1. Calculate the total cooling required
2. Determine placement of the Liebert XD units
3. Determine required pipe sizes
4. Calculate the refrigerant volume of the Liebert XD systems
5. Complete design details including, electrical, mounting, piping, etc.
3.2 Calculate the Heat Load to be Handled by Liebert XD System
When designing a cooling solution using the Liebert 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 or Liebert DS units. If the facility is new, typically up to 150 watts per square foot (1500W/m
of cooling can be obtained from Liebert precision air conditioning units supplying air through a raised
floor. In existing facilities, such factors as raised floor height, under-floor obstructions or other limitations may reduce this to less than 50 watts per square foot (500 watts per m
Once the total required sensible cooling capacity is known, subtract the sensible cooling portion to be
provided by Liebert Deluxe or Liebert DS units. This yields the cooling capacity to be provided by the
Liebert XD system.
2
)
2
).
13
3.3 Selecting Liebert XD Cooling Modules
The next step is to select the Liebert XD cooling modules to be configured into the solution. Liebert
XD modules that use pumped refrigerant can be connected to the same Liebert XDP/Liebert XDC piping circuit. This includes the Liebert XDCF, Liebert XDH, Liebert XDO and Liebert XDV.
Generally, the Liebert 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 Liebert XDV is designed to permit mounting directly on top of an equipment cabinet, for ease of
installation in existing facilities. The Liebert XDV may also be suspended from overhead, using suitable mounting methods.
The Liebert XDCF is a self-contained module designed to cool Egenera’s BladeFrame EX cabinets and
equipment without exhausting heat into the room. Two modules may be mounted on the rear of a
BladeFrame cabinet.
The Liebert XDH is installed among equipment cabinets and is particularly suited to new installations.
3.4 Airflow Requirements for Liebert 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.
A Liebert XD system can supply the cooled air to satisfy this cooling demand, but airflow through the
enclosure 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. The Liebert XDA is particularly suited to the
hot aisle/cold aisle arrangement.
Designing a Liebert XD Solution
3.5 Configuring a Liebert XD System
3.5.1 Number of Modules Supported by a Liebert XDP or Liebert XDC
The numerals designating the model size of a Liebert XD unit may be used to configure a cooling system. For example, a Liebert XDO20 has a model size of 20 and a Liebert XDP160 will accommodate
cooling modules with a cumulative model size of 160.
Similarly, the minimum number of modules connected to a Liebert XDP or Liebert XDC may be calculated using the model size number for the Liebert XDP or Liebert XDC and the modules. See Table 2.
Table 2 Maximum and minimum modules supported by a Liebert XDP or Liebert XDC
Cooling
Module Type
Liebert XDCF 16 6 16 4
Liebert XDH20 8 4 8 2
Liebert XDH32 5 2 5 1
Liebert XDO16 10 4 10 2
Liebert XDO20 8 4 8 2
Liebert XDV8 20 8 20 4
Liebert XDV10 16 7 16 4
Different types of Liebert XD cooling modules may be connected to the same Liebert XDP or Liebert
XDC as long as the sum of their cooling capacity does not exceed the supporting Liebert XDP’s or Liebert XDC’s model size number.
Liebert XDC Liebert XDP
Max Min Max Min
NOTE
Connecting only Liebert XDCF modules to a Liebert XD unit is not recommended because the
Liebert XDCF heat loading is dependent on server airflow and server load. Consult factory to
determine if sufficient heat load is available from the server for the Liebert XD system to
operate effectively.
14
3.6 Liebert XDO Placement
HOT AISLE
Cold Aisle Spacing
Hot air is
drawn into
the XDO for
cooling
XDOXDO
Critical
Equipment
Critical
Equipment
Critical
Equipment
Critical
Equipment
COLD AISLE
Hot air goes
into the hot
aisle
Cooled air
enters the
rack...
Hot air goes
into the hot
aisle
Cooled air
enters the
rack...
COLD AISLE
3.6.1 Determining Spacing of Liebert XDOs in an Aisle
Liebert XDO units should be placed in rows directly above the cold aisles of a room for optimum cooling. Each Liebert 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 Liebert XDO modules in a
row. Depending on the cooling capacity to be achieved, spacing between Liebert XDO modules in a
row may 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 system may be negatively affected and gaps in cooling may occur.
Emerson recommends installing one Liebert XDO at the end of each aisle being cooled and to space
the remainder between these end units in pairs as shown in Figure 15. This layout will block the
incursion of hot air around the side of the end cabinets.
Figure 14 Liebert XDO placement over cold aisle
Designing a Liebert XD Solution
Table 3 can be used to determine the correct number and spacing of Liebert XDOs.
Table 3 Calculating quantity and spacing of Liebert XDO modules (example below is Liebert XDO20)
Input Information Step Result
Total heat load in the room, kW A
Reserve capacity needed
(10% to 25% of A is recommended)
Existing/planned Liebert Deluxe/DS unit
sensible capacity, kW
Room area, square feet H
Spacing of cold aisles, center-to-center,
typically 12-16 ft (3.7 to 4.9m)
B
C Required cooling capacity, kW = A + B
D
E Required Liebert XD system cooling capacity, kW = C – D
Number of Liebert XDO20s required = E ÷ 20, rounded up (60Hz)
F
Number of Liebert XDP
G
rounded up (60Hz and 50Hz)
I Area served by each Liebert XDO20 = H ÷ F
J
K Spacing between each Liebert XDO = (I ÷ J) - 2
L
Required Liebert XD system cooling density = E x 1000 ÷ H
OK if under 640; otherwise, additional cooling is required from
Liebert Deluxe or Liebert DS units.
15
/Liebert XDC modules required = F ÷ 8,
= E ÷ 16, rounded up (50Hz)
Designing a Liebert XD Solution
Front-to-rear spacing of
pairs of XDO modules
XDO height above
equipment to be cooled
Heat-Generating Critical Equipment
Pairs of XDO modules
above critical equipment
Liebert recommends installing one Liebert
XDO at the end
of each aisle
being cooled
and to space
the remainder
between these
“end units” in
pairs. This layout will block
the incursion of
hot air around
the side of the
end cabinets.
3.6.2 Determining Vertical Placement of Liebert XDOs Above the Cold Aisle
In the maximum density configuration, Emerson recommends placing the Liebert XDOs 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 Liebert XDOs in a row will be increased. To ensure coverage of the
wider spaces between the Liebert XDO units, the vertical distance between the cabinets and the Liebert XDOs should be increased. However, the recommended maximum height of the Liebert XDO
above the cabinets is 30 inches (762mm). See Figures 15.
Figure 15 Liebert XDO spacing—horizontal and vertical
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3.7 Liebert XDV Unit Placement
INCORRECT
Liebert XDV
hangs over front
edge of rack
INCORRECT
Liebert XDV is
too far from front
edge of rack
CORRECT
Liebert XDV is flush with
front edge of rack
X
Liebert XDV is suspended
from ceiling structure. ..
X
....the separation
between the rack and
the Liebert XDV
should be held to
less than 1" (25mm).
If this is not possible,
an air blocker should
be added to prevent
unwanted airflow
between the hot aisle
and the cold aisle.
Liebert 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 Liebert XDV modules may be spread out
accordingly.
The Liebert 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 16 Positioning Liebert XDV on top of cabinet
Designing a Liebert XD Solution
Both of the Liebert XDV’s power cords should be connected to power sources. If only one power source
is available, then only the power cord labeled “SECONDARY” should be connected to the power
source.
Piping for the Liebert XDV is routed upward to the main return and supply pipes to and from the Liebert XDP/Liebert XDC.
Table 4, below, may be used to determine the correct number of Liebert XDV modules.
Table 4 Determine required number of Liebert XDV modules (example below is Liebert XDV10)
Total heat load in the room, kW A
Reserve capacity needed
(10% to 25% of A is
recommended)
Existing/planned Liebert
Deluxe/DS sensible capacity, kW
Room area, square feet H
Input Information Step Results
B
C Required cooling capacity, kW = A + B
D
E Required Liebert XD system cooling capacity, kW = C – D
Number of Liebert XDV10 modules required = E ÷ 10, rounded up (60Hz)
F
Number of Liebert XDP/Liebert XDC modules required = F ÷ 16, rounded
G
up (60Hz and 50Hz)
I Area served by each Liebert XDV10 = H ÷ F
L
Required Liebert XD system cooling density = E x 1000 ÷ H
OK if under 580 for 12-foot cold aisle spacing
OK if under 435 for 16-foot cold aisle spacing
Otherwise, additional Liebert Deluxe or Liebert DS unit capacity is
needed.
17
= E ÷ 8, rounded up (50Hz)
3.8 Liebert XDCF Placement
Liebert XDCF Modules
attached to
Egenera BladeFrame EX Cabinet
Upper Module
Lower Module
The Liebert XDCF is a self-contained module designed to cool Egenera’s BladeFrame EX cabinets and
equipment. Liebert XDCF modules attach to the rear of the Egenera BladeFrame EX cabinet, beside
the power modules (see Figure 17). No cutting or drilling is required to attach the modules; all
mounting holes, slots and pins required are fabricated at the factory. The Liebert XDCF does not
require electrical connections.
The number of Liebert XDCF modules required is determined by the heat load of the cabinet—cabinets cannot share cooling from a Liebert XDCF module.
The Egenera BladeFrame EX cabinet has provisions for mounting two Liebert XDCF modules, should
the heat load require two modules. If only one Liebert XDCF will be needed, Liebert recommends
using the lower Liebert XDCF module.
The complete system consists of Liebert XDCF modules, piping, Liebert XDP or Liebert XDC refrigerant distribution units and those units’ chillers or drycoolers.
Figure 17 Liebert XDCF unit mounting locations
Designing a Liebert XD Solution
18
3.9 Liebert XDH Placement
X
D
H
X
D
H
X
D
H
X
D
H
X
D
H
X
D
H
X
D
H
X
D
H
Hot
Aisle
Cold
Aisle
Hot
Aisle
Cold
Aisle
X
D
H
X
D
H
X
D
H
X
D
H
X
D
H
The free-standing Liebert XDH cooling unit is best placed among the equipment cabinets in a hot
aisle-cold aisle arrangement (see Figure 18). The Liebert XDH draws in air from the hot aisle, cools
it and discharges the cooled air into the cold aisle where it is drawn into the equipment cabinets. Regular spacing aids in optimizing cooling.
Liebert XDH units should be placed among the cabinets that generate the greatest amount of heat. If
heat loads are dispersed evenly throughout the room, the Liebert XDH modules may be spread out
accordingly.
If a Liebert XDH is installed at the end of a row, Liebert recommends using uni-directional air diffusers on that Liebert XDH. The uni-directional diffusers can be used for left or right air discharge by
removing them from the Liebert XDH, turning them 180 degrees, then reattaching them to the Liebert XDH.
Liebert recommends using bi-directional air diffusers on Liebert XDH modules installed between
racks.
Figure 18 Liebert XDH placement
Designing a Liebert XD Solution
3.10 Liebert XDP/Liebert XDC Placement
The Liebert XDP/Liebert XDC may be placed in the critical space or in an adjacent equipment room.
The allowable distance between the Liebert XDP/Liebert XDC and its connected cooling modules is
determined by the piping design and by the amount of refrigerant required. Refer to 3.12 - Liebert XD
Refrigerant and 3.13 - Liebert 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 Liebert XDP/Liebert XDC unit. Liebert XDV/Liebert XDO modules should be
placed as close to the same level as possible. The differences in elevation between the highest and lowest Liebert XDV or Liebert XDO module in a system should be no more than 6 feet (2m).
19
Designing a Liebert XD Solution
Downflow
Cooling
Unit
Downflow
Cooling
Unit
XDVs Mounted
on Equipment Rack s
Perforated
Raised
Floor Tile s
Circuit 1
Equipment Racks
without XDVs
Downflow
Cooling
Unit
Downflow
Cooling
Unit
Equipment Racks
without XDVs
XDVs Mounted
on Equipment Ra cks
Circuit 2Circuit 1
Perforated
Raised
Floor Tile s
Interlaced piping arrangement
for enhanced protection
3.11 Examples of Expansion and Interlaced Connection of Liebert XD Cooling Modules
Figure 19 Liebert XDV units mounted on racks emitting 3kW of heat, top view
Figure 20 Liebert XDV units mounted on racks emitting 5kW of heat, top view
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