10 Fan Drycooler/Fluid Cooler
Contents
1. casa 4 1 1 LI LI pts mms 1 1 Li e 3 1 4 1 a gt 2 lt nO 7477 8081 82 83 70 71 Heat Rejection Drycooler Interlock Interlock Flow Switch Connection B 2 a TYPICAL PUMP CONTROL PANEL Optional Remote Alarms Contact on Loss of Current Cooling Unit Z M 4 4 Cooling Unit __ 1 E d Cooling Unit __ Ti 1 dd ATO Cooling Unit _ Cooling Unit E att Cooling Unit __ uw Cooling Unit 1 bo S44 my 1 Cooling Unit LaLa Cooling Unit i L I a 4 470 Cooling Unit Lepr Cooling Unit __ 473 gna j Cooling Unit __ Li 1 a 1 1 1 L NOTES 1 All 24 volt control wiring is shown in dashed lines by others 2 Refer to individual wiring schematics for power wiring 20 Installation 3 8 Checklist for Completing Installation 4 0 ngo 12 18 After installation proceed with the following list to verify that the installation is complete Complete and return the Warranty Inspection Check Sheet which is shipped with the unit and return to the address indicated on the check sheet Proper clearances for service access have been maintained around the equipment Equipment is level an2. 1 1 2 Optional Feat re s P REPE OUS v 1 2 0 PRODUCT PERFORMANCE DATA amp 3 2 1 Standard acd Su pica pius pali uu c Puer Pda ea ce Ss Uds ad 3 2 2 Typical Application o oec aem eT PED EISE UIN EAT NS 4 2 3 Engineering Data Calculations and Selection 4 2 4 Selection Example eue E UE EO BG bee un eei ER Ace ER 7 3 0 INSTALLATI N 52 2 6d sek cae eee eae wad wane kw Oe 8 3 1 Location Considerations alk eo LE que Ina oe du OC 2 dde 8 3 2 Site Preparation cos SE sea ME ACRES 10 3 3 Equipment Inspection Upon Receipt 11 3 4 Handling Lifting the Drycooler 11 Umi Weight PEERS DUET poe Rc DU 11 3 5 Piping Connect Ons sn Dur cT tee EOS e E CN Wee EMI E e TO TII ere 12 3 5 1 Expansion Tanks Fluid Relief Valves and Other 13 3 6 Filling Instructions Cete eoe eee ed tcn E d e DERE d fd qe 16 3 6 1 Preparing the System for
3. 27 6 0 TROUBLESHOOTING 554255 UR RERO a ee ra iC RR DR 28 Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8 Figure 9 Figure 10 Figure 11 Figure 12 Table 1 Table 2 Table 3 Table 4 Table 5 Table 6 Table 7 Table 8 Table 9 Table 10 Table 11 FIGURES ypical application 9 45h22 een a dhe ee BA Ree 2 Capacity correction factor e re wh thie E Eck UR 5 Pressure drop correction factor 6 Clearance considerations 4 9 Umit mensions o btt st likens set Te orn siden a 10 RIG CNG INStPUCHIONS toh cessive cess dus ates 12 Typical piping idia prani 5 sass unserer eb Ma tee 14 Piping Dimensions 5 u e pre EET e ee ae Lhe oe tet eec 15 Electrical Field 1 19 Typical low volt wiring 1 20 Fluid temperature 23 Current sensing relay susp esee ee Gide AWS are atl eee Be a eee ack WRB ara waned 24 TABLES Drycooler performance
4. 1 3 Drycooler performance data per circuit 2 ene ha 3 Drycooler performance data per 3 Maximum Liebert evaporator units per every 10 Fan 1 4 Specific heats for aqueous ethylene glycol solutions 5 Altitude correction 3 4 ged eR d eve pe ger yep Pa ee fet 5 Electrical specifications 6 Piping specifications DE PEE AY ROG bee REPRE D ER 15 Volume in standard L copper 15 Ethylene glycol 17 GontrolettIngsse o EOS vot oko MH pete e DELL tcr 22 Introduction 1 0 INTRODUCTION 1 1 1 2 System Description and Standard Features The 10 Fan Drycooler Fluid Cooler is designed for maximum heat rejection with minimum footprint and to be used with glycol solutions for large site installations It has a nominal range of 150 tons of heat rejection and is ideal for rejecting the heat of multiple evaporator units Standard features include Three different coil circuits 068 half 136 full 272 double Each coil circuit is designed for a range of specific flow rates based on the partic
5. 16 9 6 2 Glycol Solutions exl ene Tet e Pe re Pd eH Ne Eee d 16 9 6 3 oEllling the System voee geek aa RV He eee Rebeca e e Ate 17 3 7 Electrical Connections 2s uoo Iac ca belt bo ea Sew eae E a vb as d ip Re 18 NOMA Gr ids ease yr e ie 18 3 7 2 Low Voltage Control Wiring 20 3 8 Checklist for Completing 2 21 4 0 OPERATION G 29 2 503 dr iu uc SR Rea UR 3 Gm POO ae Dees 22 4 1 Initial Startup Procedure 125 es 22 471 Control Set points s cn Heer yet Ee RACE eb e ec 22 4 1 2 Current Sensing 24 4 1 8 Cold Weather Operation 24 5 0 SYSTEM MAINTENANCE x 2268 oe eG Seta daa bios 25 5 1 General Procedures alk te de drain p 25 5 2 Special 7 26 55242 Drycoolec Cleaning e Dun 26 5 2 2 Maintenance Inspection Checklist
6. First set selection under amperage on selector switch then start all fans Set the trip delay for 50 Disconnect one of the load side wires from a fan being monitored by the control Turn the potentiome ter until the LED is lit Reconnect the fan wire Check and repeat for the other circuits Be sure to set the fluid temperature controls as per the specifications as illustrated within the unit electrical sche matic supplied with the unit or refer to 4 1 1 Control Setpoints and Table 11 See Figure 12 for current sensing relay layout Cold Weather Operation For operation of units located where outdoor ambients will include temperatures at or below freezing a glycol solution should be used Please refer to the installation sections referring to piping 3 5 Pip ing Connections and glycol solutions 3 6 2 Glycol Solutions for further details 24 System Maintenance 5 0 SYSTEM MAINTENANCE A UNIT CONTAINS POTENTIALLY LETHAL ELECTRICAL VOLTAGE The fans may start unexpectedly Disconnect power supply before working on unit Line side of factory disconnect remains energized when disconnect is off Use a voltmeter to make sure power is turned off before checking any electrical connections or functions 5 1 General Procedures NOTE When ordering replacement parts for equipment it is necessary to specify unit model number serial number and voltage Please record those numbers in the spaces below Model Number
7. 2438 mm Corner Wall Installation 3 2 Site Preparation Drycoolers should be installed in a level position to assure proper venting and drainage This space should have all services electrical drain water in close proximity Also the space should be level and free of loose gravel sand flooring or roofing For roof installation mount drycoolers on steel sup ports in accordance with local codes To minimize sound and vibration transmission mount steel sup ports across load bearing walls For ground installations a concrete pad is sufficient to carry the load The base should be at least 2 inches 51 mm higher than the surrounding grade and 2 inches 51 mm larger than the dimensions of the unit base The drycooler base has mounting holes for securing the drycooler once installed See Figure 5 Figure5 Unit dimensions Air Flow Side and Bottom 183 94 93 11 tom E 0 69 Mounting Hole 6 places N 20 50 86 0 LL 103 5 d Anchor Plan 1 50 Installation 3 3 3 4 3 4 1 Equipment Inspection Upon Receipt When the 10 Fan Drycooler arrives inspect it for any visible or concealed damage Do not accept a damaged unit from the shipper Any damage caused in transit must be reported immediately to the carrier and a damage claim filed with a copy sent to your sales representative Failure to do s
8. 15 1 4 OUTLET 22 1 4 566mm INLET 61 1 4 1556 mm INLET 70 3 4 1797 mm OUTLET Table 8 Piping specifications No of Internal No of No of Connection Sizes Inlet Coil Internal Model Circuits Inlets A Outlets B and Outlet OD in Volume Gal I DON 150 68 2 625 DTN 150 136 2 92 8 351 4 125 DGN 120 272 Cut off closed end of connection tube connect couplings and elbows as required Table 9 Volume in standard Type L copper piping Diameter in Volume Outside Inside gal ft 1 3 8 1 265 0 065 0 81 1 5 8 1 505 0 092 1 15 2 1 8 1 985 0 161 2 00 2 5 8 2 465 0 248 3 08 3 1 8 2 945 0 354 4 40 3 5 8 3 425 0 479 5 95 4 1 8 3 905 0 622 7 73 15 Installation 3 6 3 6 1 3 6 2 Filling Instructions Preparing the System for Filling It is important to remove any dirt oil or metal filings that may contaminate the cooling system piping in order to prevent contamination of the fresh glycol solution and fouling of the drycooler piping The system should be flushed thoroughly using a mild cleaning solution or high quality water and then completely drained before charging with glycol Cleaning new systems is just as important as clean ing old ones New systems can be coated with oil or a protective film dirt and scale are also common Any residual contaminants could adversely affect the heat transfer
9. 0 to 2 0 gpm circuit range 7 Using Table 2 the actual Heat Rejection per ITD for Model 150 with 272 circuits 1 25 gpm circuit is 69 526 Btu h F which exceeds our Required Heat Rejection per ITD of 52 300 Btu h F No correction for altitude is required 8 Total Actual Heat Rejection for the drycooler QA ITD f where fis found in Figure 2 QA 69 526 Btu h F 30 F 1 04 2 169 211 Btu h 9 Pressure drop for 1 25 gpm circuit is 6 25 ft water using Table 2 for 4096 ethylene glycol and Tt avg 115 F Use Figure 3 to find correction factor for the pressure drop for 20 ethylene glycol and Tf avg 120 F Therefore the pressure drop will be 6 259 0 93 5 8 ft water 10 Using Table 7 and Drycooler Model DON 150 with a 460 VAC 3 phase 60 Hz motor the electrical requirements will be FLA 31 amps WSA 32 amps and OPD 35 amps Installation 3 0 INSTALLATION 3 1 CAUTION Follow all unit dimensional drawings carefully Determine whether any building alterations are required to run piping and wiring Also refer to the submittal engineering dimensional drawings Location Considerations The drycooler should be located for maximum security and maintenance accessibility Avoid ground level sites with public access or areas which contribute to heavy snow or ice accumulations To assure an adequate air supply it is recommended that drycoolers be located in a clean air ar
10. 12 95 F 35 C 384 24 2 D N 150 272 110G 8 tons 9 100 F 37 8 C 288 18 2 111 G 28 1 kW D N 150 136 6 105 F 40 6 C 192 12 1 10 95 F 35 C 380 24 0 D N 150 272 116G 10 tons 7 100 F 37 8 C 266 16 8 121 G 35 2 kW D N 150 136 5 105 F 40 6 C 190 12 0 7 95 F 35 C 378 23 8 D N 150 272 15 tons 192G 5 100 F 37 8 C 270 17 0 52 7 kW D N 150 136 4 105 F 40 6 C 216 13 6 6 95 F 35 C 402 25 4 D N 150 272 20 tons 2406 4 100 F 37 8 C 268 16 9 70 3 kW D N 150 136 3 105 F 40 6 C 201 12 7 4 95 F 35 C 312 19 7 D N 150 272 30 tons 363 G 3 100 F 37 8 C 234 14 8 105 kW D N 150 136 2 105 F 40 6 C 156 9 8 1 Ratings based on using 40 ethylene glycol listed outdoor ambient rating temperature 120 F 48 9 C entering gly col Selections are valid for standard or TEAO motors Consult your local Liebert representative for Quiet Line selections Engineering Data Calculations and Selection Procedure An alternate detailed procedure is available to calculate values and select the correct the 10 Fan Dry cooler s for the application This can be used to assist in selecting drycoolers for applications for ambient conditions that are not standard Use the following steps 1 Determine the following items to begin this procedure Design outdoor ambient air temperature Toa F or C Fluid Flow Rate gpm
11. 15 8 471 136 1 2 04 125 2 04 125 10 82450 140080 68 92 8 351 5100 2313 1 703 000 499 544 34 3 15 1 451 272 2 4 125 2 4 125 10 82450 140080 68 92 8 351 5100 2313 Ratings based on using 40 ethylene glycol 95 F 35 C entering air 120 F 48 9 C entering glycol 2 gpm 13 1 5 circ Sound data is for sound pressure measured 5 ft 1 5m height 30 ft 9 1 m from the unit Table 2 Drycooler performance data per circuit Heat Rejection per ITD Btu h F Pressure Drop ft of water NO OF Range Flow Rate per Circuit gpm circuit Flow Rate per Circuit gpm circuit Model Internal min max No 2 Circuits gpm 1 1 5 2 1 1 5 2 120 60 68 68 136 29 507 39 991 46 972 8 2 16 1 27 3 136 136 340 45 829 53 713 57 917 5 9 2 23 7 272 272 544 56 201 60 785 63 153 4 8 7 15 1 150 60 68 68 136 30 144 42 440 51 621 8 2 16 1 27 3 136 136 340 50 346 61 660 68 219 5 9 2 23 7 272 272 544 65 785 73 118 77 019 4 8 7 15 1 150 50 68 68 136 29 791 41 011 48 823 8 2 16 1 27 3 136 136 340 47 617 56 724 61 728 5 9 2 23 7 272 272 544 59 756 65 257 68 146 4 8 7 15 1 Data is based on 40 ethylene glycol solution at 115 F 46 1 C average solution temperature expressed in Btu h Table 3 Drycooler performance data per circuit metric Heat Rejection p
12. CONTROL VALVE FLOW SWITCH COOLING UNIT AP PRESSURE DROP STRAINER FILTER L Refer to Figure 7 for a detailed installation diagram Product Performance Data amp Selection 2 0 PRODUCT PERFORMANCE DATA amp SELECTION 2 1 Standard Data Table 1 Drycooler performance data Total Heat Pressure No amp No amp Rejection 25 F Flow Drop Size of Size of Internal Shipping 13 9 C ITD Rate No of Air Flow Sound Weight Model Ft of Internal tions tions of No Hz Btu h kW gpm Ips Circuits inlet outlet Fans cfm cmh dBA Gal L Lbs Kg 120 60 1 172 000 343 136 86 272 812 68 2 2 625 2 2 625 10 74160 126000 65 92 81351 5100 2313 1 447 000 424 272 17 2 15 8 471 136 1 2 04 125 2 04 125 10 74160 126000 65 92 8 351 15100 2313 1 579 000 463 544 34 3 15 1 45 1 272 1 2 04 125 2 04 125 10 74160 126000 65 92 8 351 5100 2313 150 60 1 287 000 377 136 8 6 27 3 81 5 68 2 2 625 2 2 625 10 99030 168250 72 92 8 351 5100 2313 1 703 000 499 272 17 2 15 8 471 136 204 125 2 94 125 10 99030 168250 72 92 8 351 5100 2313 1 924 000 564 544 34 3 15 1 45 1 272 2 4 125 2 4 125 10 99030 1168250 72 92 8 351 5100 2313 150 50 1 218 000 357 136 8 6 27 3 81 5 68 2 2 625 2 2 625 10 82450 140080 68 92 8 3511 5100 2313 1 541 000 452 272 17 2
13. Glycol and Average Temperature 1 08 S 71 1 qul mE Leer LLL pal deep place Pau I Lm Dis 777 RE IND ER d JU RR ua Podere eiie 1 170118 ott call SE il ee DA EG 80 100 120 140 160 F 26 7 37 8 48 9 60 71 1 Average Fluid Temperature Product Performance Data amp Selection Figure 3 Pressure drop correction factor Glycol and Fluid Temperature 5 gt L 9 e MSN n 30 77 29 Peas 10 0 80 100 120 140 160 F 26 7 37 8 48 9 60 71 1 C Average Fluid Temperature Table 7 Electrical specifications Voltage 60 Hz 50 Hz Phase 208 3 230 3 460 3 575 3 380 415 3 Drycooler Model Motor FLA MCA OPD FLA OPD FLA MCA OPD FLA MCA OPD FLA MCA OPD DON 150 STANDARD 70 72 90 70 72 90 35 36 45 28 30 35 35 36 40 DTN 150 TEAO 70 72 90 70 72 90 35 36 45 n a n a n a n a 32 35 DGN 120 QuietLine 48 50 60 48 50 60 24 25 30 28 30 35 24 25 30 Product Performance Data amp Selection 2 4 Selection Example For the f
14. Liebert Keeping Business In Business ENVIRONMENTAL PROTECTION 10 Fan Drycooler Fluid Cooler INCLUDING QUIET LINE MODELS USER MANUAL 120 to 150 Tons 50 amp 60 Hz 5 EMERSON PRODUCT MODEL INFORMATION Table i Model Number Designation Model Type D D Drycooler 0 Standard 10 Fan Motor Type 0 G Quiet Line 10 Fan T TEAO 10 Fan No of Pumps Controlled H H 0 Pumps T Fan Cycling Unit Control X X Fan Cycling w Current Sensing Nominal Capacity 150 150 Tons 60 amp 50 Hz Tons of Heat Rejection Capacity 0 120 120 Tons 60 Hz Quiet Line A 460 3 60 B 575 3 60 Voltage Phase Hz A C 208 3 60 D 230 3 60 M 380 415 3 50 N None Coil Guard G Wire Aluminum 1 068 Number of Coil Circuits Half Coil Circuiting 3 136 Number of Coil Circuits Full 6 272 Number of Coil Circuits Double A Aluminum C Phenolic Coated Coil Type A P Polycoated Fin U Cu Cu NOTE To ensure optimum performance and safe operation of this system each person responsible for the installation operation and maintenance of this unit must read and carefully follow the instructions in this manual TABLE CONTENTS PRODUCT MODEL INFORMATION INSIDE FRONT COVER 1 0 wie a CR 1 1 1 System Description and Standard
15. Serial Number Voltage Periodic attention is necessary for continued satisfactory operation of your unit A daily inspection of the system should be made to verify that the unit is performing satisfactorily It is suggested that daily log be maintained recording inlet and outlet coolant temperature ambient temperature and the coolant pressure gauge readings The coolant sight glass should be checked and the fans checked for unusual sounds which may indicate wear or future trouble Monthly inspections should include removal and cleaning of strainer and cleaning and inspection of coil The coil can be cleaned with water compressed air or steam as required During monthly inspec tions it is also wise to check the coolant to assure sufficient glycol in the mixture to prevent freeze up Each fan motor amp draw should be checked If performance or operation problems are also detected refer to 6 0 Troubleshooting for required action Use copies of 5 2 2 Maintenance Inspection Checklist Restricted air flow through the drycooler coil will reduce the operating efficiency of the unit and can result in high fluid temperatures and loss of cooling Clean the drycooler coil of all debris that will inhibit air flow This can be done with compressed air or a 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 f
16. 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 registered trademarks of their respective owners SL 10061 1 05 USER MANUAL Technical Support Service Web Site www liebert 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
17. Material Safety Data Sheets and ensure that you can use the product safely Glycol manufacturers request that the customer read understand and comply with the information on the product packaging and in the current Material Safety Data Sheets Make this information available to anyone responsible for operation maintenance and repair of the drycooler and related equipment No chemical should be used as or in a food drug medical device or cosmetic or in a product or pro cess in which it may contact a food drug medical device or cosmetic until the user has determined the suitability and legality of the use Since government regulations and use conditions are subject to change it is the user s responsibility to determine that this information is appropriate and suitable under current applicable laws and regulations CAUTION Automotive antifreeze is unacceptable and must NOT be used Typical inhibited formula ethylene glycol and propylene glycol manufacturers and suppliers are Union Carbide Ucartherm and Dow Chemical Dowtherm SR 1 Dowfrost These glycols are sup plied with corrosion inhibitors and do not contain a silicone anti leak formula Commercial ethylene glycol when pure is generally less corrosive to the common metals of construction than water itself Aqueous solutions of these glycols however assume the corrosivity of the water from which they are prepared and may become increasingly corrosive with use when not properly inhi
18. ational sequence setpoints Notes Signature Make photocopies of this form for your records 27 Troubleshooting 6 0 TROUBLESHOOTING Symptom Unit will not operate Possible Cause No main power Check Or Remedy Check L1 L2 and L3 for rated voltage Disconnect switch open Close disconnect switch Blown fuse or circuit Check fuses or circuit breaker breaker tripped Control fuse or circuit Check for 24VAC If no voltage check for short Replace fuse or breaker tripped reset circuit breaker Improperly wired Check wiring diagram No output voltage from transformer Check for 24VAC If no voltage check primary voltage Unit runs but motor protector keeps tripping Motor protector defective Motor protector too small Replace protector Check amp draw Fan or pump motor has shorted winding Low or unbalanced voltage Repair motor Determine reason and correct Outlet temperature from unit too high Low or no coolant flow See Pump will not operate or no coolant flow entry in this table Ambient air temperature higher than design Correct possible hot air discharge to fans from another source Heat load higher than design Check for misapplication need larger cooler Correct possible additional heat load being added to cooling circuit Throttling valve improperly Reset valve to proper differential pressure Liquid squirts from
19. bited 16 Installation 3 6 3 There are two basic types of additives Corrosion inhibitors and Environmental stabilizers The corrosion inhibitors function by forming a surface barrier that protects the metals from attack Environmental stabilizers while not corrosion inhibitors in the strictest sense of the word decrease corrosion by stabilizing or favorably altering the overall environment An alkaline buffer such as borax is a simple example of an environmental stabilizer since its prime purpose is to maintain an alkaline condition pH above 7 The percentage of glycol to water must be determined by using the lowest design outdoor temperature in which the system is operating Table 10 indicates the solution freeze point at several c concentra tion levels of ethylene glycol Propylene glycol concentrations should be 1 higher than ethylene gly col table values to find the freeze point For example 41 propylene glycol freezes at 10 F Table 10 Ethylene glycol concentrations Glycol by Volume 0 10 20 30 40 50 Freezing Point F C 32 0 25 3 9 16 8 9 5 15 0 10 23 3 32 35 5 Apparent Specific Gravity 1 1 014 1 028 1 042 1 057 1 071 50 F 10 C A minimal amount of glycol should be considered for inhibitive coil protection CAUTION The quality of water used for dilution must be considered because water may contain corrosive elements that redu
20. ce the effectiveness of the inhibited formulation Surface water that is classified as soft low in chloride and sulfate ion content less than 100 ppm each should be used Filling the System Installation of hose bibs at the lowest point of the system is recommended When filling a glycol system keep air to a minimum Air in glycol turns to foam and is difficult and time consuming to remove Anti foam additives are available and may be considered Open all operating systems to the loop With the top vent s open fill the system from the bottom of the loop This will allow the glycol to push the air out of the top of the system minimizing trapped air Fill to approximately 80 of calculated capacity Fill slowly from this point checking fluid levels until full NOTE For glycol solution preparation and periodic testing follow manufacturer s recommendations Do not mix products of different manufacturers 17 Installation 3 7 3 7 1 Electrical Connections Each unit is shipped from the factory with all internal unit wiring completed Refer to the electrical schematic when making connections All wiring must be done in accordance with the National Elec tric Code and all local and state codes WARNING A UNIT CONTAINS POTENTIALLY LETHAL VOLTAGE The fans may start unexpectedly Disconnect power supply before working on unit line side of factory disconnect remains energized when disconnect is off Use a voltmeter to make s
21. closed downstream of cooling unit Strainer clogged or dirty Open all valves Remove strainer plug and clean Pump cavitating erratic gauge operation Possibility of air in lines Bleed all components Check surge tank to pump inlet connection Check for piping restrictions 28 9 Liebert Keeping Business in Business HEAT REMOVAL PRECISION AIR 10 Fan Drycooler Fluid Cooler INCLUDING QuiETLINE MODELS 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
22. d mounting fasteners are tight Piping completed to coolant loop All piping connections are tight as well as secured and isolated for vibration reduction All piping connections inspected for leaks during initial operation Line voltage to power wiring matches equipment nameplate Power wiring connections completed to disconnect switch including earth ground Power line circuit breakers or fuses have proper ratings for equipment installed Control wiring connections completed to heat loads evaporator s including wiring to optional controls All wiring connections are tight 11 Foreign materials have been removed from in and around all equipment installed shipping materials construction materials tools etc Fans rotate freely and in correct direction without unusual noise and discharge the air upwards Glycol has been added to the drycooler to prevent freeze damage 21 Operation 4 0 OPERATION A UNIT CONTAINS POTENTIALLY LETHAL VOLTAGE The fans may start unexpectedly Disconnect power supply before working on unit Line side of factory disconnect remains energized when disconnect is off Use a voltmeter to make sure power is turned off before checking any electrical connections or functions 4 1 Initial Startup Procedure Refer to 3 8 Checklist for Completing Installation and verify that all installation items have been completed prior to proceeding Turn the unit ON Check the fans for proper rotation air d
23. ea away from loose dirt and foreign matter that may clog the coil In addition drycoolers must not be located in the vicinity of steam hot air or fume exhausts The unit may be mounted either at ground level or on a roof given proper structural support and fol lowing a review of local codes Pit installations are not recommended Air re circulation will severely affect unit and or system performance For these same reasons units should not be installed closer than 72 1829 mm from a wall This clearance should be increased to 96 2438 mm in corner wall situations In multiple unit installations units should not be installed closer than 72 1829 mm end to end or 96 2438 mm side to side For further details see Figure 4 Installation Figure 4 Clearance considerations 72 1829 mm Single Pit MAX 2134 mm See Note 2 WALL a 2438 mm 96 A 7 0438 mm 2438 mm 77 v2 84 Double Pit oe 2134 mm See Note 2 E ins WALL NOTES 1 ALL DIMENSIONS ARE MINIMAL UNLESS OTHERWISE NOTED 2 PIT INSTALLATIONS ARE NOT RECOMMENDED RE CIRCULATION OF HOT DISCHARGE AIR IN COMBINATION WITH SURFACE AIR TURBULENCE CANNOT BE PREDICTED HOT AIR RE CIRCULATION WILL SEVERELY AFFECT UNIT EFFICIENCY AND CAN CAUSE HIGH PRESSURE TRIPS OR FAN MOTOR TEMPERATURE TRIPS SUPPLIER WILL NOT BE RESPONSIBLE FOR DUCTING FANS TO A HIGHER LEVEL TO ALLEVIATE THE ABOVE MENTIONED CONDITIONS 96
24. er ITD kW C Pressure Drop kPa Model odd Flow Rate per Circuit Ips circuit Flow Rate per Circuit Ips circuit Hz Circuits Ips 0 06 0 09 0 13 0 06 0 09 0 13 120 60 68 6 13 23 9 29 8 32 1 24 5 48 0 81 5 136 13 26 30 8 31 9 32 0 14 9 27 5 70 7 272 26 38 30 7 30 6 30 5 11 9 26 0 45 1 150 60 68 6 13 24 9 33 1 37 5 24 5 48 0 81 5 136 13 26 36 0 39 1 39 8 14 9 27 5 70 7 272 26 38 37 9 38 4 39 0 11 9 26 0 45 1 150 50 68 6 13 24 4 31 1 34 2 24 5 48 0 81 5 136 13 26 32 8 34 6 34 7 14 9 27 5 70 7 272 26 38 33 3 33 4 33 3 11 9 26 0 45 1 Data is based on 40 ethylene glycol solution at 46 1 C 115 F average solution temperature expressed in kW Product Performance Data amp Selection 2 2 2 3 Typical Application The most popular use for the 10 Fan Drycooler is at sites with large cooling loads such as data center telecom sites where multiple indoor air conditioners are used See Table 4 for general outline of sug gested quantity of indoor units for each 10 Fan Drycooler or contact your Liebert representative for custom match up Figure 1 illustrates typical application Table 4 Maximum Liebert evaporator units per every 10 Fan Drycooler Maximum Total System Liebert Liebert Deluxe Deluxe Deluxe Units 10 Outdoor Model 60 Hz Unit Fan Ambient Drycooler 50 Hz Capacity Drycooler Rating gpm Ips Model
25. ezing of residual water 13 Installation Figure 7 Typical piping diagram PUMP PACKAGE EXPANSION TANK CH P ag GHIN i dm GPM E DRYCOOLER NO 1 MODEL COOLING UNIT 4 ipe GPM Us AP Ft kPa MODEL Diam Inches mm GPM Lis Ft kPa zil AP Ft kPa 4 J COOLING UNIT MODEL Ead GPM Lis AP Ft kPa COOLING __ L MODEL GPM Lis J AP Ft kPa 1 T COOLING UNITA DRYCOOLER NO 2 MODEL MODEL GPM Lis AP ____ GPM Lis AP Ft kPa LEGEND Dk GATE VALVE COOLING UNIT IN CHECK VALVE MODEL GPM Lis l BUTTERFLY VALVE AP Ft kPa jg RELIEF VALVE UNION COOLING UNIT ___ MODEL fj OR FLOW CONTROL VALVE GPM Lis AP Ft kPa FLOW SWITCH ae AP PRESSURE DROP AE Y STRAINER FILTER epu zu NOTES PRESSURE AND TEMPERATURE GAUGES OR PORTS FOR SAME ARE RECOMMENDED TO MONITOR COMPONENT PRESSURE DROPS AND PERFORMANCE 2 FLOW MEASURING DEVICES DRAIN AND BALANCING VALVES TO BE SUPPLIED BY OTHERS AND LOCATED AS REQUIRED 3 SEE PRODUCT LITERATURE FOR INSTALLATION GUIDELINES AND CLEARANCE DIMENSIONS 4 DRAWING SHOWS DUAL PUMP PACKAGE ALTERNATE PUMP PACKAGES WITH MORE PUMPS MAY BE CONSIDERED CONSULT SUPPLIER 14 Installation Figure 8 Piping dimensions 69 1753 mm OUTLET 1295mm 387 mm
26. han per ITD higher altitude application sites should use Table 6 correction factors to reduce Actual Heat Rejection results If it is less repeat process from Step 5 using a larger model If 10 Fan Drycooler solution is oversized lower capacity drycoolers are available and may be considered as an alternative solution 8 Calculate the Total Actual Heat Rejection QA for the drycooler using the Actual Heat Rejection per ITD Step 7 and actual ITD and correcting for glycol and AFT see Figure 2 QA QArrp ITD f 9 After selecting a model look up the unit s Pressure Drop in Table 2 Multiply this pressure drop by the correction factor found in Figure 3 If the resulting pressure drop is higher than your system design go back to Step 5 and select a model with more circuits or consider multiple units Contact your sales representative for additional design assistance 10 Electrical data for model selected is found in Table 7 Table 5 Specific heats for aqueous ethylene glycol solutions C Ethylene Glycol 0 10 20 30 40 50 Btu h gpm F 500 490 480 470 450 433 kW Ips C 4 18 4 09 4 01 3 93 3 76 3 62 Table 6 Altitude correction Altitude Feet M o 1000 2000 5000 8000 12000 15000 0 305 610 1525 2440 3660 4575 Correction Factor 1 000 0 979 0 960 0 900 0 841 0 762 0 703 Figure2 Capacity correction factor
27. ing the UNIT 11 Installation Figure 6 Rigging instructions LIFT 2 7 8 REMOVABLE CHAIN PULLS at 73 mm 2 PLACES MUST CLEAR TOP OF FAN GRILLES SPREADER BAR 94 3 32 2390 mm 5 29 32 150 mm 94 3 32 2390 mm MUST USE 2 NOMINAL PIPE THRU UNIT FOR SLINGS TO AVOID BASE DAMAGE 3 76 mm DIAMETER DO NOT USE SMALL HOLES IN LIFTING HOLES LEGS FOR RIGGING THESE UNITS 3 5 Piping Connections See Figure 7 for a typical piping diagram See Figure 8 piping locations A CAUTION To avoid the possibility of burst pipes it is necessary to install a relief valve in the system This valve may be obtained from your supplier as an option or may be sourced from another vendor Galvanized pipe must not be used in glycol systems To help prevent piping failures supply and return lines must be supported such that their weight does not bear on the piping of the unit or pumps Units are shipped pressurized with a 30 psig dry air holding charge It is recommended that manual service shut off valves be installed at the supply and return connec tions to each unit This enables routine service and or emergency isolation of the unit In addition multiple pump packages require a check valve at the discharge of each pump to prevent back flow through the standby pump s It is further recommended that filters strainers that can be easily replaced or cleaned with 16 20 mesh sc
28. ischarging up Check the pumps for proper rotation A Do not run pumps without fluid in the system Pump seals require fluid to keep them cool running them for any amount of time will damage the seals which may cause a failure 4 1 1 Control Setpoints The fluid temperature controls should be set according to Table 11 for standard cooling only or free cooling GLYCOOL applications See Figure 11 Table 11 Control settings Heat Fluid Rejection Temperature Method Control Setpoint Offset Differential Open Close 1TAS 68 F 20 C 68 F 20 C 80 F 26 7 C Standard 1STG 5 F 2 8 C 12 F 6 7 C 73 F 22 8 C 85 F 29 4 C 2STG 10 F 5 6 C 78 F 25 6 C 90 F 32 2 C 1TAS 42 F 5 6 C 42 F 5 6 50 F 10 C Free Cooling o o o o o o o o GLYCOOL 1STG 2 F 1 1 C 8 F 4 4 C 44 F 6 7 C 52 F 11 1 C 2STG 4 2 2 C 46 F 7 8 C 54 F 12 2 C 22 Operation Figure 11 Fluid temperature controls 23 Operation 4 1 2 Figure 12 Current sensing relays Current Sensing Relays If supplied be sure that the current sensing relays CSR are wired as per the wiring schematic using 24V Class 2 copper wiring When the thermostat closes a 24 volt signal will be sent to the relevant terminals of the CSR When this occurs a time delay starts allowing the amperage to be sensed on the load side of the contactors
29. luid lines and capillaries for vibration isolation Support as necessary Visually inspect all fluid lines for signs of fluid leaks Inspect the motor fan assemblies to insure bearings are free and the motor is secure within the mount The glycol level in drycooler systems must be periodically checked At the high point of the system check for Positive pressure Air to be vented An unclogged expansion tank Proper concentration of inhibitors and antifreeze The first three checks may give an indication of leaks in the system 25 System Maintenance 5 2 5 2 1 Special Procedures Drycooler Cleaning Keeping the outdoor drycooler coils clean is an important factor in maintaining peak efficiency reli ability and long life of the equipment It is much easier to keep up on frequent cleanings rather than wait until heavy build up has occurred which may create head pressure problems with the evaporator units When to Clean Normal conditions typically dictate cleaning twice a year spring and fall On site or area conditions such as cottonwood trees construction etc can increase cleaning frequency On your standard bimonthly or quarterly preventive maintenance schedule a visual inspection of the coil is recom mended to monitor conditions What to Use The best overall condenser coil cleaner to use is plain water If the coil has been maintained and cleaned at regular intervals water is sufficient to remove dir
30. m Grilles Aluminum grilles are used for unit aesthetic and general mechanical security purposes The alumi num grilles extend from the base of the unit and protect the exposed coil sides Coil Fin Options Pre Coated Fin Stock provides pre coated coil fins for added protection in corrosive environments Phenolic Coated Coil provides a baked phenolic coated coil for added protection in corrosive envi ronments Copper Fin Copper Tube Coil provides coil constructed of copper fins and copper tubes Enclosed Motor Option TEAO motors are totally enclosed and are used in industrial applications They are not available for Quiet Line or 575 Volt models Ancillary Items Tanks for fluid expansion pumps pump control panels flow switches shut off valves and relief valves should also be considered for the site installation Since these items are custom sized per appli cation please consult with your sales representative for selection Introduction Figure 1 Typical application PUMP PACKAGE Hh JAGS J 1 KH HHH s Cee d COOLING UNIT COOLING UNIT we 4 l COOLING UNIT mL 1 1 COOLING UNIT bee COOLING UNIT 11 4 Dee 1 X t E 1 COOLING UNIT HL COOLING UNIT LEGEND COOLING UNIT GATEVALVE COOLING UNIT CHECK VALVE 4 BUTTERFLY VALVE A fa RELIEF VALVE Hx UNION COOLING UNIT BALL OR FLOW
31. nections REMOTE START REMOTE ALARM CONTACTS CONTROL FUSE ON LOSS OF CURRENT AND FUSE BLOCK CURRENT SENSING CONTROL RELAY OPTION TRANSFORMER HI VOLTAGE FUSES AND FUSE BLOCKS FACTORY INSTALLED DISCONNECT SWITCH GROUND LUG POWER CONTROL SWITCH THERMOSTAT 1ST amp 2ND STAGE AND DISPLAY MODULES EE 92 2 CONTACTOR ELECTRIC SERVICE NOT BY CSc LIEBERT THREE PHASE FOR ALL WIRING MODELS PROVIDE IN ACCORDANCE WITH LOCAL AND NATIONAL ELECTRIC CODE 7 8 KNOCKOUT 22 mm 3 PLACES 19 Installation 3 7 2 Low Voltage Control Wiring A control interlock between the drycooler and the heat load s will require 24V Class 2 copper wiring for remote on off sequencing of the drycooler with the load Refer to the electrical schematic for wiring to terminals 70 amp 71 See Figure 10 for typical low volt system wiring If the current sensing relay option is provided 24V Class 2 wiring will be necessary to make the con nections to monitor motor operation A CAUTION Make sure all electrical connections are tight Figure 10 Typical low volt wiring diagram Remote r Start Contact i 1 1 1 1 1 f Optional Remote Alarms Contact 1 Flow Switch oniloss eye 1 of Current L 41 11 tt 1 I 1 1 it Remote Pg i N i i roo i i 1 oo 1 1 1
32. net to dirt 26 System Maintenance 5 2 2 Maintenance Inspection Checklist Date Prepared By Model Serial Number NOTE Regular inspections are necessary to assure proper cleanliness of the cooling fins Should inspection reveal dirt or corrosion appropriate cleaning should be performed Monthly Semiannually Drycooler Drycooler 1 Coil surfaces free of debris 1 Complete all monthly items ___ 2 Fans grilles free of debris 2 Piping in good condition 8 Fan motors securely mounted 3 Piping secure 4 Motor bearings in good 4 Wash coil as needed Pump Package condition 5 No glycol leaks 1 Pump rotation Pump securely mounted 2 3 No glycol leaks 4 No abnormal noises Pump Package Drycooler Electric Panel Fan Motors 1 Motor 1 draw amps 2 Motor 2 amp draw amps ___ 3 Motor 3 amp draw amps 4 Motor 4 amp draw amps ___ 5 Motor 5 amp draw amps ___ 6 Motor 6 amp draw amps 7 Motor 7 amp draw amps ___ 8 Motor 8 amp draw amps 9 Motor 9 amp draw amps ___ 10 Motor 10 amp draw amps 1 Complete all monthly items 2 Test changeover operation 3 Pump 1 amp draw Pump 2 amp draw Pump 3 amp draw 4 Glycollevel and general condition 5 Glycol freeze point FandpH__ 6 Check all electrical connections 7 Check contactors for pitting 1 Check all electrical connections 2 Check contactors for pitting ___ 3 Oper
33. o may result in an inability to recover costs for damage Before removing the drycooler from the truck container review the previous section 3 2 Site Prep aration A CAUTION If the drycooler is not installed immediately upon receipt special storage precautions should be taken It is recommended that the unit be stored in a dry heated place Do not store the unit at temperatures less that 36 F 2 2 C If the storage temperature is below 36 F 2 2 C water vapor can condense in the coil freeze and cause permanent damage Failure to store unit properly will void the warranty Handling Lifting the Drycooler WARNING Do not unload the drycooler with a forklift The drycooler s high center of gravity makes it a tip hazard Further tilted forks may damage the drycooler When removing the unit from the truck and when moving the unit between areas of equal height use chains and hooks Riggers are required to lift the unit into place Refer to Figure 6 for lift locations Any time the unit is lifted use slings or chains with spreader bars attached to the three lifting eyes on either side of the unit base Do not allow any part of the lifting apparatus to bear against the coil fins All lifting appa ratus must also clear the fan guards on the top of the unit Unit Weight Dry weight of the unit is 5100 pounds 2818 kg WARNING To avoid a tilt hazard adjustment may be necessary to locate the center of gravity prior to lift
34. ollowing example English I P units will be used Metric units are also provided in the tables and figures Find a drycooler to cool 340 gpm of 20 ethylene glycol water solution from 125 F to 115 F Applica tion is located near sea level and has an outdoor design air temperature of 95 F 1 Assume the following values Toa 95 F Vp 340 2096 ethylene glycol Top 125 F i 115 F 2 Initial temperature difference ITD Tef Toa 125 95 30 F Since Tetis known calculate Total Required Heat Rejection QRr c Ter Tip Using Table 5 c 480 for 20 ethylene glycol QRr 340 gpm 480 Btu h gpm F 125 F 115 F 1 632 000 Btu h 3 Average Fluid Temperature Tr avg Tef Ty 2 125 F 115 F 2 120 F 4 Required Heat Rejection per ITD QRrrp ITD f where fis found from Figure 2 Using Figure 2 1 04 for 120 F and 20 EG concentration 1 632 000 Btu h 30 F 1 04 52 300 Btu h F 5 Locate Model Number s in Table 2 matching flow rate of 340 and meeting or exceeding 52 300 Btu h F Either Model 120 with 272 circuits or the Model 150 with 272 circuits matches the flow rate requirements and meets or exceeds the Required Heat Rejection per ITD For this example Model 150 will be chosen to complete the procedure 6 Flow rate per circuit Vo circuits 340 gpm 272 circuits 1 25 gpm circuit This is within the 1
35. or Ips 96 ethylene glycol concentration Fluid temperatures at drycooler Entering and leaving or C or Total Required Heat Rejection QR Btu h or kW and one of the fluid temperatures above 2 Findthe following values using these equations and known values above nitial Temperature Difference ITD of entering fluid to outdoor design air ITD Tet Toa Total Required Heat Rejection QRr Vr c Tef where c is found in Table 5 or Leaving fluid temperature Typ Tef QRr where c is found in Table 5 3 Find the Average Fluid Temperature Tef 2 4 Find Required Heat Rejection per ITD QRr ITD f where f is the capacity correction factor found in Figure 2 Product Performance Data amp Selection 5 Using Table 2 columns titled Flow Rate Range and Heat Rejection per ITD choose the Drycooler Model matching application fluid flow rate and meeting exceeding the required Heat Rejection ITD from Step 4 6 Find the Flow Rate per Circuit circuits for the drycooler selected in Table 2 This should be in the range of 1 0 to 2 0 gpm circuit 0 06 to 0 13 Ips circuit for proper long term performance 7 In Table 2 for the selected Model Number find the Actual Heat Rejection per ITD using the gpm circuit from Step 6 You may interpolate between columns as required The Actual Heat Rejection should be equal to or greater t
36. reen be placed in the supply line These filters extend the service life of the drycooler and the system s pumps To facilitate filling installation of hose bibs at the lowest point of the system is recommended Consideration of the minimum glycol temperature to be supplied from the drycooler will determine if the need exists to insulate the glycol supply and return lines Insulation will prevent condensation on the glycol lines in low ambient conditions All fluid piping must comply with local codes Care in sizing pipes will help reduce pumping power and operating costs 12 Installation 3 5 1 Expansion Tanks Fluid Relief Valves and Other Devices An expansion tank must be provided for expansion and contraction of the fluid due to temperature change in this closed system Vents are required at system high points to vent trapped air when fill ing the system A relief valve is also a necessary piping component Depending on the complexity of the system various other devices may be specified Pressure gauges flow switches automatic air separator tempering valves standby pumps and sensors for electrical controls are just a few of these devices CAUTION Immediately following the use of water for leak testing or system cleaning charge the tested system with the proper percentage of glycol and water for your coldest design ambient Complete system drain down cannot be assured and damage to the system could result from fre
37. stability and performance of your system In many cases in both old and new systems special cleaners are needed to remove scale rust and hydrocarbon foulants from pipes manifolds and passages Clean heat transfer surfaces are important in maintaining the integrity of the heating cooling system For more information on clean ers and degreasers contact your sales representative Follow the manufacturer s instructions when using these products Calculate the internal volume of the system as closely as possible The 10 Fan Drycooler volume not including the load or field supplied piping is 92 8 gallons 851 1 Use Table 9 for field installed pip ing volumes Glycol Solutions NOTE Glycol solutions should be considered for the protection of the coil When glycol solutions are not used damage can occur either from freezing or from corrosion from water When considering the use of any glycol products in a particular application you should review the lat est Material Safety Data Sheets and ensure that the use you intend can be accomplished safely For Material Safety Data Sheets and other product safety information contact the supplier nearest you Before handling any other products mentioned in the text you should obtain available product safety information and take necessary steps to ensure safety of use CAUTION When mishandled glycol products pose a threat to the environment Before using any glycol products review the latest
38. surge tank fill cap when pump is turned off Pump suddenly stops pumping Air in system Clogged strainer or impeller Vent all high points repeat as necessary Check liquid level in surge tank Clean out debris Pumping suddenly slows Clogged impeller diffuser or line Clean out debris and use strainer Excessive leakage around the pump shaft while operating Worn seal or packing Replace seal or packing Pump performance poor Worn impeller or seal Replace with new impeller or seal Suction lift too high Relocate pump closer to supply Motor not up to speed low voltage Larger lead wires may be required Check for proper line voltage 10 Worn bearings Replace pump Pump has noisy operation Worn motor bearings Low discharge head Replace pump Throttle discharge improve conditions Debris lodged in impeller Remove cover and clean out Cavitating pumps Adjust system pressures Pump discharge pressure too high Pump will not operate or no coolant flow Throttling valve improperly set Reset valve to proper differential pressure Valve closed in circuit Open all valves downstream of unit Strainer clogged or dirty No power to pump motor Remove strainer plug and clean See Unit will not operate in this table Low coolant level Check coolant level Tubes plugged in cooling coil Flush coil with reputable cleaner Valve
39. t and debris from the fins Heavy build up on the exterior of the fins can be removed with a brush Water pressure from a garden hose and sprayer usually works well If a pressure washer is used make sure the equipment is set to a lower pressure setting and that the nozzle is set to the fan spray not stream Otherwise damage to the fins could result If a cleaner is required we recommend a non acidic type cleaner be used Acid type cleaners can be aggressive to the coil fins as well as surrounding areas Many sites do not allow the use of acidic cleaners for environmental reasons How to Clean The absolute best way to clean coils is from the inside out This requires removing the coil guards or grilles if provided the fan guards and blades to access the coil surface The sprayer can then be worked across the coil pushing the dirt and debris out Although this does extend the time involved the results are well worth it This method should be used at least once a year Spraying the coil from the outside repeatedly can push a majority of the dirt to the inner section of the fins and continue to restrict air flow Keep in mind you may not have the luxury of shutting the unit s down for an extended time A pre scheduled shutdown with the operator may be in order If you are using a cleaner along with the spraying process follow recommended manufacturer instructions and be sure to rinse the coil thoroughly Any residue left on the coil can act as a mag
40. ular application Coil constructed of copper tubes in a staggered pattern expanded into continuous corrugated alu minum fins The fins have full depth fin collars completely covering the copper tubes which are connected to heavy wall type L headers Inlet coil connector tubes pass through relieved holes in the tube sheet for maximum resistance to piping strain and vibration Coil maximum operating pressure is 150 PSIG 1035 kPa Wire guards constructed of coated wire in 1 x 4 pattern mounted to protect the exposed vertical coil surface Current sensing relays are provided with customer connection to monitor change in motor current to detect possible motor fan failure Choice of either 60 or 50 Hz models as well as a Quiet Line 60 Hz comes from the factory com pletely assembled and pre wired Units are available in 208 230 460 and 575 Volts 3 phase 60 Hz and 380 415 Volts 3 phase 50 Hz Locking disconnect switch and fan cycling control Unit frame of heavy galvanized steel for strength and corrosion resistance divided internally into individual fan sections by full width baffles to prevent fan reverse windmilling when not ener gized Optional Features Quiet Line The Quiet Line 10 Fan Drycooler includes the same features as the standard 10 Fan Drycooler except that it has 8 pole motors in lieu of 6 pole motors for lower sound levels as well as reduced airflow and capacity This option is not available on 50 Hz units Aluminu
41. ure power is turned off before making any electrical connections Line Voltage Drycooler rated voltage should be verified with available power supply upon receipt of unit but before installation Refer to the unit electrical schematic and serial tag for specific electrical requirements All wiring must be done in accordance with the National Electric Code as well as all local and state codes CAUTION Size the system electrical service for the total of all drycoolers and ancillary components FLA WSA OPD Unit specific wiring diagrams are provided on each unit Use copper wiring only Make sure that all connections are tight Line voltage electrical service is required for all drycoolers at the location of the drycooler The power supply does not necessarily have to be the same voltage supply as required by the indoor unit for which the drycooler operates This power source may be 208 230 460 or 575 Volt 60 Hz or 380 415 Volt 50 Hz A unit disconnect is standard However a site disconnect may be required per local code to isolate the unit for maintenance Route the supply power to the site disconnect switch and then to the unit Route the conduit through the hole provided in the cabinet Connect earth ground to lug pro vided near terminal board For units with multi voltage transformer the transformer connections should match change if necessary the local power supply See Figure 9 18 Installation Figure 9 Electrical field con
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