Liebert EMERSON 60 HZ User's Manual
Contents
1. 12 Giycol Inh1DH OE Solution 5 12 Pipine e qb A 12 PUMP PACKAGES amp EXPANSION TANK OPTIONS 13 SUPPLEMENTARY APPLICATION DATA 14 MAINTENANCE 14 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 Figures Drycooler model numbers ae PE b id dan dae KI 1 Capacity Correc Se ERG ER EU URS De KUN SA 5 Pressure drop correction factor 5 Dimensional data 1 4 fan models 6 Dimensional data 6 amp 8 fan 6 Typical footprint and Unit anchor ERA ba sete ae L ee 6 General arrangement ERE 11 nata ara 18 Pump THOUI LIS Apri en bw E d da dA 13 a2. 12 124 1315 5 221b 80 32 12 14 185 2218 80 12 14 1315 2 12 14 135 6 40 12 14 135 6 2218 o ow ow e 4218 64 12 4 135 6 2218 To Se 2 6 79 64 82 80 164 115 22188 79 32 82 80 164 1715 22148 30 80 82 80 164 115 880 52 82 80 164 1715 2218 96 80 164 115 4218 oo 80 164 115 2218 94 32 82 80 164 115 8 2 Quiet Line Models QuetlinModels o SSS 30 aw 4 5 DOT ROT DO NO RO DO NIN 4 4 55 1 2 40 4 4 585 1 ay 8 84 95 2 1 23 M amp 95 2 1l 2 8 8 95 2 158 ay 22 14 115 3 2 ay 22 14 115 3 2 ay 22 14 115 3 2 82 80 164 5 2 248 82 80 4 15 4 2 3 ay 72 14 1315 6 ___ 12 1M 1315 2218 32 12 12 115 6 2218 45 amp 82 80 164 8 2218 48 32 164 i185 8 2218 49 99 82 80 164 Tejo
3. 718 8 22 49 32 82 164 8 Connections are ODS Motors are 3 4 HP standard models 1 4 HP Quiet Line models 1 Standard circuiting ELECTRICAL DATA Table 6 Drycooler electrical data of Fans 33 69 92 109 112 139 174 197 225 260 310 350 352 419 466 491 620 650 700 790 880 940 C RR PR oo hof ru 208 230 60 Boss 9 pepe so 3 oz 490 sz sas soo 3 sr7 500 5 ono s soo s 312 573 600 408 s 482 sis 700 622 883 ano Soo a 420 s sre ass lama 525 soo s sre sos 500 s sas 865 ono jajar 55 s 64 72 60 s 106 iso a2 wo 150 nee 25 25 68 77 159 55 50 s oz vi s sel 145 150 rro rs 200 5 65 77 s sz 159 ss 11 150 s vis so 162 200 nsa 195 25 Css s pa 280 450 asa 297 500 61514 500 ra 361 soo 365 soo 3 546 sos ono 075 s 27 sso s ss 60 s ss Dsn s ss 7 152 s on 155 s espresso s ss 44 s 52 58 159 5 66 185 s 150 s os 150 s 142 20 jajan
4. 48 73 41 74 88 75 76 188 35 248 69 T7 132 82 189 es 22 20 55 84 128 ms 248 2448 174 348 8 32 91 52 96 87 99 125 101 173 4896 32 122 132 133 143 268 ____ 41 M4 er M8 9I 184 96492 or 142 i47 99 150 200 14288 96 i46 40 149 66 150 96 152 133 153 347 ee ee ee ee 51 4 14 255 9912 6 188 77 195 128 199 186 201 257 142 96 195 51 200 85 202 124 204 172 Standard Circuiting Based on 40 Ethylene Glycol Solution at 115 F average solution temperature expressed in MBH Specifications subject to change without notice Figure2 Capacity correction factor Figure3 Pressure drop correction factor and average temperature F Glycol and fluid temperature Correction Factor Correction Factor GLYCOL GLYCOL 80 100 120 140 160 100 120 40 Average Fluid Temperature Average Fluid Temperature DIMENSIONAL DATA Figure 4 Dimensional data 1 4 fan models 43 9 16 Eyebolts for lifting oy condenser provided on 4 6 amp 8 fan models only Height to top of fan guard 37 71 43 118 962
5. s ss 159 185 s 150 s 150 rss sas so 5 75 s ss 150 ros ma iso s vir 132 150 5 nas 160 200 rra 25 Table 7 Drycooler electrical data Quietline models of Fans 8 siak 40 57 60 158 173 178 205 248 347 356 453 498 ows orale 208 230 60 5153162 115013171180 150 3 89 159 107111811503 23 152 150 188 200 75 260 2 500 3 275 359 50 0 29 6 357 500 ata 37 5 60 0 550 41 1 600 36 6 44 7 15 3 48 0 69 6 100 0 498 61 4 1005 3 51 6 682 100 0 534 650 1100 57 0 110 0 606 722 1100 as s ss 150 3 56 1503 57 65 150 66 74 150 5 84 92 150 5 102 110 150 s sz 69 150 3 66 78 50 75 87 150 8 96 150 102 14 150 3 120 132 150 Fors 20 23 150 s 27 30 150 3 37 150 s 41 44 159 355 58 159 s 69 72 150 as 5181157 115013 44 150 4 5 54 150 62 58 150 3 66 72 150 86 150 20 150 55 150 65 62 150 3 69 83 90 150 3 46 56 150 3 53 63 5 70 150 3167 77 150 3 81 94 150 85 105 150 50 83 150 3 75 90 150 8
6. 40 GPM 16 CIR 2 5 GPM CIR 4 In Table 4 Model 174 with 16 circuits at the 2 5 GPM CIR column provides 6 9 MBH ITD which exceeds the required MBH ITD of 6 15 Pressure Drop 10 5 ft from Table 4 x 0 93 from Figure 3 9 8 ft H30 Table 2 Glycol Solution Determining actual BTUH and MBH indi Table 3 Altitude correction FO 1000 2000 5006 8000 12000 5000 PERFORMANCE DATA Table 4 Drycooler performance data MBH F Initial Temperature Difference Model GPM 1 5 15GPM CIR 2 0 GPM CIR 2 5 GPM CIR 3 0 GPM CIR Number Range CIE PD ft water MBH ITD ft water PD ft water PD ft water Standard Models Standard Wodels 00 LIE E GL AT EI 069 612 4 18 73 21 23 24 235 23 38 25 27 28 184 09 918 27 79 30 33 167 35 280 83e iz 32 37 38 62 37 87 38 11 _ 6 36 48 38 63 39 87 139 2 4 8 33 71 37 39 168 233 748 39 38 43 82 45 12 2448 1 42 46 45 73 102 48 sere 45 26 ar 49 66 80 92 124 8 36 2 46 146 49 22 1 45 33 50 52 71 58 98 im 2448 58 47 es 758 69 105 73 145 _ 1 997 24
7. Table 10 Glycol concentration at various ambients EIEIEIEIEIEN Dago 1 000 1 014 1 028 1 042 1 057 1 071 MAINTENANCE GUIDELINES Glycol by volume Freezing point F Apparent specific gravity 50 F Table 11 Volume in standard tube Type L copper tube Diameter in Volume Gam Um 773 Restricted airflow through the drycooler coil will reduce the oper ating efficiency of the unit and can result in high fluid tempera tures and loss of cooling Clean the drycooler coil of all debris that will inhibit air flow This can be done with compressed air or commercial coil cleaner Check for bent or damaged coil fins and repair as necessary In winter do not permit snow to accumulate around the sides or underneath the drycooler Check all fluid lines and capillar 1 for vibration isolation Support as necessary Visually inspect all fluid lines for signs of fluid leaks Inspect the motor fan assembly to insure bearings are free and motor is secure within the mount The glycol in drycooler systems level must be periodically checked At the high point of the system check For positive pressure For air to be vented e For an unlogged expansion tank A fluid sample for proper concentrations of anti freeze and inhibitors The first three checks may give indication of leaks in the system 14 Important When ordering replacement pa
8. 85 353 127 366 940 25 4 96192 298 77 332 354 368 20 aes 34 51 359 86 375 128 386 Table 4 Drycooler performance data continued MBH F Initial Temperature Difference Model GPM 1 5 1 5 __ 2 0 2 5 GPM CIR 3 0 GPM CIR Number Range ee PD ft water MBH ITD PD ft water MBH ITD PD ft water MBH ITD PD ft water Quiet Line Models 04 4 74 17 35 i7 59 18 88 18 123 _ 057 12 21 36 22 23 86 23 22 30 23 23 62 88 050 24 8 22 71 23 24 166 25 239 M48 24 38 25 89 25 81 28 080 24 8 27 62 30 98 32 15 33 201 832 33 34 51 ST i 248 44 47 48 74 44 104 45 13 3672 24 42 32 44 48 48 72 46 100 2 18 5 4895 3 48 29 48 49 50 70 96 18 2148 6 56 64 eo 103 63 147 203 3e7 2 60 43 64 67 68 138 448 i6 66 135 69 198 71 289 sea 4T T2 68 T5 138 78 24 48 23 69 20 7i 291 73 489 3r 71 60 73 100 148 78 200
9. 32 38 EN iW 34 3 66 0 30 24 2 2 a 7s 6 DEAL DE 8 Ww 5 167 152 78 61 ru v 3 242 20 19 90 Calculate Total Pump Drycooler Full Load Amps FLA Total FLA Pump FLA Drycooler FLA To Calculate Total Pump and Drycooler Wire Size Amps WSA Total WSA Largest Motor FLA x 1 25 Sum of other Motor FLA values To Calculate Total Pump and Drycooler Maximum Overcurrent Protective Device OPD Total OPD Largest Motor FLA x 4 0 Sum of other Motor FLA values Select standard fuse size 15A 20A 25A 30A etc Figure 11 Pump curve 60 Hz 180 The part numbers shown are for the pumps installed in Liebert Single and Dual Pump Packages P N 1C19433P1 amp 1A11062P1 are non typical and are used in certain applications reguiring higher pumping pressures than normally provided for 160 140 120 100 80 Total Head ft water 60 40 0 10 20 30 40 Flow Rate GPM 13 SUPPLEMENTARY APPLICATION DATA Table9 Room dew point temperatures Dew point F C F C 52 4 m 5 59 T 61 2 52 4 n Minimum glycol temperature before condensation will occur
10. 64 32 48 13 76 101 248 1 65 62 73 99 78 ii 82 194 48 98 70 25 2448 16 71 74 80 20 90 235 er 2 97 44 97 68 104 104 109 2448 16 83 84 97 15 07 15 268 8 32 107 41 124 98 129 136 2448 16 92 122 109 209 121 291 129 402 4896 3x 123 134 104 146 202 42 M2 67 100 11 188 3672 2 106 55 121 87 134 129 139 179 2448 16 95 106 173 129 251 367 4836 32 132 52 347 88 157 127 165 175 466 152 53 167 i76 127 183 6 104 58 25 58 48 06 263 T2144 48 167 53 180 86 188 128 193 820 4896 32 167 14 133 214 228 283 99192 4i 235 68 248 98 258 1386 _ 650 60320 40 199 227 134 246 195 260 78456 52 220 63 102 281 152 272 208 _ 20 240 80 246 41 268 278 287 700 290 96192 246 60 268 100 282 146 292 202 96 267 40 285 67 295 98 302 135 790 4896 32 189 228 257 Te er 264 52 880 268 129240 80 304 52 334
11. Liebert Keeping Business In Business HEAT REMOVAL ENVIRONMENTAL CONTROL Drycoolers 60 Hz GENERAL DATA 7 EMERSON TABLE CONTENTS LIEBERT DRYCOOLBERS ea a RD a ER E Wo 1 FEATURES AND BENEFITS OF LIEBERT DRYCOOLERS 2 SELECTION PROCEDURE 5 xw a C eade deo P eoo ca Cad e 3 PERFORMANCE DATA Ee Erato Ca a 4 DIMENSIONAL DATA 6 ELECTRICAL DATA Doo 8 GUIDE 5 10 Standard Features for Direct Drive Propeller Fan Drycoolers 10 General en 10 10 tr 10 10 on Ack NT 10 Electrical Control sts i 10 COMPONENT ASSEMBLY INSTALLATION 11 APPLICATION INSTALLATION 5 12 9631101 ute it d dU e in 12 Drycooler Install at on 12 Electrical Requirements of the
12. 0 785 20 1280 469100 120 128 212 4 21700 785 23 190 10 os 64 2218 6 37900 8 NIN 706100 2 2 178 6 34800 1890 16 127 64 2218 2320 882000 4 218 8 4550 815 250 4218 8 43400 816 56 260 55 439 ses 48 48 2 595 48 565 5980 595 69 65 5680 595 90 645 250 1070 3 3 4 38 1 652100 22718 6 36500 1830 200 938200 240 Quiet Line Models 04 4435 2 88 05r 5700 30 86 060 8x90 40 81 E 100 80 ds 178 184850 80 178 180000 218980 12 9 sar sewo wo 356 371800 160 146 2 2 118 453 49800 60 126 oo 2 2 118 505280 36 41276 Standard data based on 95 F EAT 120 F EFT 40 EG Sound Level dBA Q 5 feet Connections 2 and smaller are FPT 2 1 8 are ID SWEAT Od GO O Od C2 NO gt DES 1 8 SELECTION PROCEDURE Table 4 shows the performance specifications for Liebert drycoolers using 40 by volume ethylene glycol solution at an average fluid temperature of 115 F with flow rates from 1 5 to 3 GPM circuit and a
13. 2 97 150 89 104 150 11 8 150 17 132 150 GUIDE SPECIFICATIONS Standard Features for Direct Drive Propeller Fan Drycoolers Furnish and install Liebert Model Air Cooled Drycoolers arranged for vertical air flow Dry coolers shall be draw through design and shall perform in accor dance with the schedule General Each drycooler shall consist of cas ing drycooler coil propeller fans direct driven by individual fan motors fan guards and mounting legs Fan motors shall be furnished for operation on a V PH Hz power supply Coil The drycooler coil shall be con structed on copper tubes on a stag gered tube pattern Tubes shall be expanded into continuous rippled aluminum fins The fins shall have full depth fin collars completely covering the copper tube Copper tubes shall be connected to heavy wall type L headers inlet coil connector tubes shall pass through relieved holes 1n the tube sheet for maximum resistance to piping strain and vibration Coils shall be factory leak tested at 300 PSIG minimum dehydrated evacuated and sealed Casing The drycooler casing shall be con structed of bright aluminum sheet Casing shall be divided into individual fan sections by full width baffles Structural support members including coil support frame motor and drive support shall be galvanized steel for strength and corrosion resis tance Aluminum legs with r
14. Er 18 Pump cuve dou 18 Drycooler performance fray b ed BB 2 Determining actual BTUH and MBH 3 4 25 23558 43232 3 s dts io waist edet ud ad oo ova does Date 9 Drycooler performance datas v3 ioo 2 dr qaa ed eda 4 Dyycooler physical data was vert Ad Ee v date T DrycoolerGlecimca uai a LR RO n ee Ca EEA 8 Drycooler electrical data Quietline 9 ache nenen ADU Kan Lea ee aa 13 Room dew point 14 Glycol concentration at various ambients 14 Volume standard tube Uer a a 14 ii LIEBERT DRYCOOLERS Liebert drycoolers are designed to be used in conjunction with water cooled refrigeration and air conditioning machines as well as a variety of commercial and industrial applications reguiring the rejection of heat from machinery or processes via a cooling fluid During periods of low ambient temperatures drycoolers may assist or replace the capacity reguirements of mechanical chillers for a free cooling effect Liebert offers a full range of control options as well as expansion tank and pump packages For cooling fluids other than water or wat
15. TANK 5 Figure 8 Pump package See WN 40 1 4 Note 1 768 4mm ump discharge gt Pump suction connections N Provided on dual pump package only Figure9 Pump mounting 1 2 12 7mm diameter holes Pump Package Mounting 4 23 584 2mm 3 4 19 1mm 3 1 2 88 9mm Notes l Single pump packages are 17 1 4 438 2mm wide Dual pump packages are 32 1 4 819 2mm wide Mounting holes are 15 11 32 389 7 mmy apart on single pump packages and 30 11 32 770 7 mm apart on dual pump packages 7 1 2hp dimensions not shown consult factory Figure 10 Expansion tank Expansion Tank P N 1C16717P1 This tank included in a standard pump package has an internal volume of 8 8 gal 33 1 and a maximum pressure of 100 psi 690 kPa This tank is sized for a typical open system with a fluid volume of less than 75 gal 2801 When used in a closed system volumes of up to 140 gal 9101 can be accommo dated The use of a safety relief valve field supplied is recommended for systems closed to atmospheric venting Other piping accessories for filling venting or adjusting the fluid in the system are recommended but not included Table 8 Pump data Connections Electric 60Hz p Elect 60Hz 3 Fir MEETS Model Suction Discharge FLA FLA FLA 34 34 34 179 a ae 3e 35
16. ebert logo are registered trademarks of Liebert Corporation All names referred to are trademarks or registered trademarks of their respective owners SL 10058 10 02 Technical Support United States 1050 Dearborn Drive P O Box 29186 Columbus OH 43229 Single Phase UPS 800 543 2378 Outside the United States 614 841 6598 3 Phase UPS 800 543 2378 Environmental Control 800 543 2778 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 Web Site www liebert com E mail UPStech liebert com 4 t gt lt EMERSON
17. er glycol mixtures contact Liebert Heat Transfer ta 1 4 7 Lee Pi 1 29 ar 9a 7 re MR 1 L 4 Yee gt atri b o 1 Figure1 model numbers D D N C 109 Y Drycooler Model Size Optional Disconnect Single Circuit DNC DNL No Pump Letter Code for Volta ZA amp Single Circuit Phase and With Pump Single Circuit Control Code Dual Pumps No Control Main Control Fan Cycling Fan Cycling amp Pump Control Special o 208 230 3 60 SZZ NUUDP 460 3 60 575 3 60 208 230 1 60 460 1 60 575 1 60 200 230 3 50 380 415 3 50 200 230 1 50 ee gt gt ded Ty 7 a v 4 x x gs Pu 7 Optional Circuiting see Table 4 FEATURES AND BENEFITS OF LIEBERT DRYCOOLERS Heat Rejection Module The low profile direct drive propeller fan type drycoolers utilize optimum circuitry to balance the heat rejec tion of the corresponding load Constructed of aluminum with a copper tube aluminum coil the unit is guiet and corrosion resistant Low Noise Level All Liebert drycoolers are designed to operate at a minimal noise level This is accomplished as the result o
18. f the Liebert fan blade design combined with a cabinet structure that minimizes air resistance Quiet Line models use low speed motors to achieve the quietest unit available Easy Installation and Service The heat rejection module is quickly and easily installed because all internal wiring is completed at the fac tory with only electrical connections to be made at the job site Maximum Reliability Because these units are factory wired and tested start up problems are eliminated and reliability of the overall system 1s greatly increased Table 1 Drycooler performance data Standard Unit Data Total Flow Press Air Internal Shipping Heat Rej Rate Drop Internal i Flow Volume Weight 25 ITD gpm Ft Water Circuits CFM dBA gal Ibs 09 eow 20 1 So 725 24 92380 30 86 0 725 480 9 10 6 40 81 2 6 725 49 45 Wem 4 2 89 58 0 4 711 2 13 0 755 48 55 18 0 755 805 2645 755 80 645 225 26 685 tor 2 8 85 310 31050 80 98 1909 773 131 886 88 84 38 35 3240 2 4 2480 785 131 1070 2 4 44 9 127 212 4 228
19. ig ging holes shall be provided for hoisting the unit into position Fans Fans shall have zinc plated steel or aluminum blades Fan shall be secured to fan shaft by means of a heavy duty keyed hub and dual set screws Fan diameter shall be 30 or less Fans shall be factory balanced and run before ship ment Fan guards shall be heavy gauge close meshed steel wire with cor rosion resistant finish Fan Motors Fan motors shall be equipped with rain slingers and perma nently sealed ball bearings Motors shall include built in over load protection Motors shall be rigidly mounted on die formed galvanized steel supports 10 Quiet Line Motors Fan motors shall be 12 pole 570 rpm equipped with rain shields and permanently sealed ball bearings Motors shall include built in overload protec tion Motors shall be rigidly mounted on die formed galva nized steel supports Electrical Control electrical connections and electrical low ambient control options shall be provided in weatherproof enclosure The enclose shall be integral with the drycooler for pleasing appearance as well as functional protection The base model DNC shall have the motor s factory wired to a three phase power block in the electrical enclosure Main electri cal control model DNL provides magnetic contactor and control voltage for remote starting of the drycooler The drycooler shall be provided with optional di
20. ise A preferred test method utilizes com mon refrigerant gas pressurized with nitrogen A refrigerant type leak detector will find even the smallest leak when properly used Galvanized pipe or other com ponents should not be used with an inhibited glycol system All fluid piping must comply with local codes Care in sizing pipes will help reduce pumping power and operating costs Manual shut off valves and unions should be installed at the supply and return line of each major sys tem component This permits rou tine service or emergency isolation of the component Where connecting to a city water supply provide a disconnection means city water source 1s desir able for initially charging the sys tem and as an emergency standby cooling source The minimum glycol temperature to be supplied from the drycooler determines whether the supply and return lines should be insu lated to prevent condensation see Table 9 Vents are required at system high points to vent trapped air when filling the system Since the system 1s not open to the atmosphere an expansion tank must be provided for expansion and contraction of the fluid with temperature change A relief valve 1s also necessary A fill port 1s necessary for charg ing the system with glycol Depending on the complexity of the system various other devices may be specified such as pressure gauges valves pumps and sensors PACKAGES amp EXPANSION
21. mm 1095mm wd 43 316 1097mm Center leg provided on 4 amp 8 fan models only Figure 5 Dimensional data 6 amp 8 fan models PER a __ 837 118 70 2213mm 36 914 4mm clearance Fr recommended on m all sides for Height to top proper operation guam and component 1095mm 37 7 8 access 8 c e al 18 457mm P 2 86 3 4 Aa 2203mm Outlet inlet connections ee leg provided on 4 amp 8 fan models only Figure 6 Typical footprint and unit anchor plan 1 25 4mm i 4 1 4 1 3 4 44 5mm 4 1 4 108 25 4 Table 5 Drycooler physical data Model Circuits A L amp Motors In Out __ Ta 2 85 34 469 aw 4 4 85 Ao 492 42 44 55 1 40 4 4 55 1 2 4i aw 4 4 1 2 3 8 985 2 2 A4 ay 95 2 2 9 8 95 2 2 2 8 955 2 2 0 20 12 ja jas 3 2 12 i35 3 1 23 382 82 80 115 4 2 ay 8 8 14 2 466 82 80 164 115 4 212 491 82 80 164 115 4 212
22. nstallations a con crete pad will support the load Drycooler Installation The drycooler should be located for maximum security and main tenance accessibility Avoid ground level sites with public access or areas which contribute to heavy snow or ice accumula tions Utilize centrifugal fan dry coolers when placing a drycooler in a building Electrical Requirements of the Drycooler Electrical service 1s required for all drycoolers at the location of the outdoor system The power supply does not necessarily have to be the same voltage supply as required by the indoor unit This separate power supply may be 208 230 460 or 575 volt 60 Hz For electri cal characteristics of the standard voltage drycoolers see Full Load Amps FLA of the drycooler in Tables 6 and 7 and FLA of the pump if used in Table 8 Dual element time delay type fuses or circuit breakers at the main power source The only elec trical connection between the indoor unit and the drycooler 1s a two wire control interlock which 1s field connected when provided Glycol Inhibitor Solution The percentage of glycol to water will be determined by the outdoor ambient in which the system 1s operating Just as critical 1s the inhibitor used with the glycol 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 metals than
23. pproximate size 3 Divide the given GPM by the No of circuits of the drycooler selected The result is GPM CIR and should be in the range of 1 1 2 to 3 4 In Table 4 look up the model selected above and under GPM CIR find the actual MBH You may interpolate between columns The MBH found should be equal to or greater than the required MBH ITD Ifthe MBH is less than required repeat from Step 2 with a larger model You may wish to repeat from Step 2 with a smaller model for the most economical selection meeting the required MBH ITD Pressure Drop After selecting a model look up the unit pressure drop following Step 3 and 4 above Multiply the pressure drop found by the Figure 3 correction factor If the product is higher than your system design go back to Step 2 and select a model with more circuits This may be the same or larger unit Example Cool 40 GPM 20 ethylene glycol and water solution from 125 F to 115 F Design 95 F Calculate BTUH 125 115 x 40 GPM x 480 BTU GPM BTUH 192 000 AFT 125 115 2 120 F From Figure 2 corr factor for 120 20 1 04 1 Required MBH ITD 192 000 125 95 1000 1 04 2 Locate model in Table 4 Models 092 through 139 fall 1nto the GPM range but do not have the MBH capacity Model 174 with 16 circuits 1s the smallest model meeting both the GPM range and MBH requirements 3 GPM CIR
24. ral arrangement diagram Fill Optional dual pump system shown Expansion Drycooler coil y ET Drycooler Glycol highest point electric box pumps in system Pressure e Pump NO Gate or bali housing 3 m 2 valve for T isolation typ Check valves L Xx Gate or ball on dual pump valve bypass systems only T Flow switch supplied with dual pump systems Flow regulating valve Pressure port Field piping 1 Air vents at top risers 1 Components are supplied by Liebert and all components shown may not be necessary for system operation 11 APPLICATION INSTALLATION GUIDELINES Location Guidelines To ensure an adeguate air supply locate drycoolers in aclean air area away from loose dirt and for eign matter that may clog the coil In addition drycoolers must not be placed near steam hot air or fume exhausts Also drycoolers should be no closer than 3 feet from a wall obstruction or adja cent unit with no obstructions over the unit Install drycoolers in a level position to assure proper vent and drain drycooler legs have mounting holes for securing the unit to steel supports or concrete pads For roof installation mount dry coolers on steel supports in accor dance with local codes To minimize sound and vibration transmission mount steel sup ports across load bearing walls For ground i
25. rts for heat rejection equipment it is necessary to specify unit model number serial number voltage Enter this information below for future use Model No Serial No Voltage Liebert Keeping Business In Business HEAT REMOVAL ENVIRONMENTAL CONTROL Drycoolers 60 Hz GENERAL DATA 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 e 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 e 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 1994 Liebert Corporation Al rights reserved throughout the world Specifications subject to change without notice Liebert and the Li
26. sconnect switch mounted and wired Fan cycling model DNT shall be used to control leaving fluid tem perature by cycling fans in one or two steps The 24 volt control cir cuit furnished consists of control transformer fan contactor s and temperature controls as speci fied Fan cycling with pump control model DSO single pump DDO dual pump shall have the features as the fan cycling model plus starter s for the pump s and a built in disconnect switch COMPONENT ASSEMBLY INSTALLATION Leg Assembly The legs are shipped loose and are to be field mounted as shown with the hardware provided Typical rigging Rigging Holes in the drycooler legs permit lifting the unit Spreader bars are required Four 6 and 8 fan models have additional lifting eyes High Voltage Electrical Connections Line Voltage 1s connected to the terminal strip or directly to the factory sup plied locking disconnect optional Check voltage and compare to nameplate Low Voltage Electrical Connections A control inter lock between the indoor and out door equipment must be mini mum 16 ga for up to 75 ft or not to exceed 1 volt drop in control line Secure each leg to drycooler frame at all four points shown using hardware provided Flow direction Electrical service Outlet Inlet supply by others Models 069 491 Models 620 through 940 have 2 sets of connections on end of unit Figure7 Gene
27. t standard air 075 lbs ft Figure 2 and Figure 3 offer correction factors to Table 4 for average fluid temperatures and glycol percentages other than 115 F and 40 Table 3 correction factors may be used for performance at altitudes above sea level For cooling applications other than shown contact the Liebert Heat Transfer Division To select a drycooler from the tables in this bulletin the following information must be known 1 Fluid Flow Rate GPM 2 96 Ethylene Glycol EG 3 Design Air Temperature at the Drycooler EAT 4 Entering and Leaving Fluid Temperatures EFT LFT or Total Heat Rejection BTU HR and one of the Fluid Temperatures 5 ITD Initial Temperature Difference EFT EAT From the known data calculate the following Average Fluid Temperature AFT EFT LFT 2 Heat Rejection BTUH Fluid Temp Diff x GPM x BTU GPM Factor Table 2 Leaving Fluid Temperature EFT BTUH GPM BTU GPM Other useful information Leaving Air Temp EAT Drycooler BTUH 1 08 Drycooler CFM Leaving Air Temperature should be lower than 145 F for proper motor operation Using Table 4 to select a drycooler Calculate required MBH ITD with corrections for glycol and average fluid temperature 1 Required MBH ITD BTUH EFT 1000 Fig 1 Factor 2 Locate Model No in Table 4 having range within the required flow rate and an MBH equal to or greater than required This gives an a
28. water It will however assume the corro sivity of the water from which it is prepared and may become increas ingly corrosive with use if not properly inhibited Proper inhibi tor maintenance must be per formed to prevent corrosion of the glycol system Consult glycol man ufacturer for testing and mainte nance of inhibitors Automotive antifreeze is unac ceptable and must not be used in any glycol fluid system There are two basic concepts of corrosion inhibition They are clas sified as corrosion inhibitors or environmental stabilizers The cor rosion inhibitors function by form ing a surface barrier that protects the metals Environmental stabi lizers decrease corrosion by stabi lizing or favorably altering the overall environment An alkaline buffer such as borax 1 a simple example since its prime purpose is to maintain an alkaline condition ph above 7 The quality of the water of dilu tion must be considered because water may contain corrosive ele ments which reduce the effective ness of the inhibited formulation Surface waters that are classified as soft and are low in chloride and sulfate ion content less than 100 ppm each should be employed 12 Piping Considerations CAUTION When using water under pressure to test the system for leaks immediately charge the tested system with glycol Com plete system drain down cannot be assured Replacing broken frozen piping is a needless exerc
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