Marley Quadraflow Cooling Tower Installation, Operation and
Contents
1. Single winding motor requires a starter with a shorting contactor e Two winding motor requires a starter with out a shorting contactor All two speed starters must have a 20 second time delay relay when switching from high speed to low speed 5 Note Note Installation Do not start the motor more than four to five times per hour each low speed start and each high speed start count as one start When using a VFD Before beginning ensure that the motor is rated for Inverter Duty per NEMA MG 1 part 31 e Set the VFD solid state overload protection to 119 of motor name plate amps and set maximum current parameter in the VFD to motor nameplate amps Maximum current parameter will reduce fan speed and limit amp draw to nameplate amps during cold weather opera tion If furnished with a mechanical O L set this at 110 over motor nameplate amps e Motor rotation must be the same in both VFD mode and By pass mode e If cable distance between the VFD and motor is greater than 100 feet a DV DT output filter is recommended to avoid damage to the motor 100 feet distance is based on our field experience the VFD manufac ture may state different distances and distance does vary depending on the VFD manufacture e Program the VFD for variable torque output Flux vector and constant torque modes may damage the gearbox e Do not start and stop the motor using the safety switch at the motor If the2. Check voltage and current of all three lines against nameplate values Wrong motor RPM Check nameplate against power supply Check RPM of motor and gear ratio Bearings overgreased Remove grease reliefs Run motor up to speed to purge excessive grease Wrong lubricant in bearings Change to proper lubricant See motor manufacturer s instructions One phase open Stop motor and attempt to start it Motor will not start if single phased Check wiring controls and motor Poor ventilation Winding fault Clean motor and check ventilation openings Allow ample ventilation around motor Check with Ohmmeter Bent motor shaft Straighten or replace shaft Insufficient grease Remove plugs and regrease bearings Too frequent starting Limit cumulative starting time to a total of 30 seconds each hour Deterioration of or foreign material in grease Flush bearings and re lubricate Bearings damaged Replace bearings Incorrect fan blade pitch Measure actual fan pitch and compare to that recommended Correct if necessary See Fan User Manual Geareducer noise Geareducer bearings Gears If new see if noise disappears after one week of operation Refer to Geareducer User Manual Correct tooth engagement Replace badly worn gears Replace gears with imperfect tooth spacing or form 23 SP COOLING TECHNOLOGIES 7401 WEST 129 STREET OVERLAND PARK KANSA
3. Marley QuadraFlow Cooling Tower User Manual 92 1333H Mwa Marley AN SPX BRAND Note A Warning A Caution Note Contents This manual contains vital information forthe proper installation and operation of your cooling tower Carefully read the manual before installation or operation of the tower and follow all instructions Save this manual for future reference Page TOWEL OG AON krak ant enn kan kind n esti apa sen es apa 4 Tower Shipment kebek pa Sees kok pon cits ti a nek do ke ta pa pi ka e ak pa ae kad a ank Pa a 5 Receiving TOWON sisi e sisie oo see do tease doua 5 Tower ASSO MDYa ainn doi koko bn de den dane pab ponp 5 Motor bone oke dad tease poko 5 Tower Start Up ei b s pake oi ad gwat ok ako di a ana pi e pi e ae bb a a kk an s 10 Tower ak ak ak e ka aha ap kk kb 13 Water Treatment and 13 Schedule of Tower 15 Seasonal Shutdown INStructions 18 Motor Relubrication INStructions escesseeeceeeteseeseeeeseeseeeseeneaeeteseeeeeteees 19 Prolonged ShUtCOWN ran ente anban antik restan ae saa si poo depan deske tan 19 Additional SEA OO Sissies pis pa atin Eaei 20 Additio
4. Leave the basin drain open During shutdown clean the tower and make any necessary repairs Pay par ticular attention to mechanical equipment supports and driveshafts Tower Framework Check structural bolted connections and tighten as required Driveshaft Check driveshaft alignment tightness of cap screws and set screws and condition of all components Refer to driveshaft service manual Fan Check fan assembly bolting and tighten as required Use torque settings prescribed on the fan nameplate Refer to fan service manual Electric Motor Clean and lubricate motor at close of each operating season Refer to motor manufacturer s recommendations Check motor anchor bolts and tighten as required See Page 19 for motor lubrication instructions Do not start motor before determining that there will be no interfer ence with free rotation of the fan drive The motor should be operated for three hours at least once a month This serves to dry out windings and re lubricate bearing surfaces Refer to Marley Electric Motor User Manual Manual 92 1475 At start of new operating season make sure bearings are adequately lubricated before returning motor to service A Warning Maintenance Drive Shaft Air Seals ff Motor Motor Lubrication Instructions Open and lock out disconnect switch to make certain motor cannot be started 1 Remove interior driveshaft air seals as shown above Opposite end motor bearing is acc
5. Manuals on each major operating component of the tower and it is recommended that you read them thoroughly Where discrepancies may exist the separate Service Manuals will take precedence Do not use the top horizontal surface of the tower as a working platform The tower is designed so that all maintenance can be performed from the exterior and interior of the tower Do not use the upper basin covers as a walking surface or working platform Remove basin covers and use portable ladders whenever performing service on the hot water basin Use of ladder should be in accord with manufacturer s recommendations The following is recommended as a minimum routine of scheduled mainte nance Always shut off electrical power to the tower fan motor prior to performing any inspections that may involve physical contact with the mechanical or electrical equipment in or on the tower Lock out and tag out any electrical switches to prevent others from turning the power back on Service personnel must wear proper personal protective clothing and equipment Weekly Inspect for bacterial growth and general operation conditions Bacte rial growth should be reported to your water treatment expert for immediate attention Monthly Weekly at Start up Observe touch and listen to the tower Become accustomed to its normal appearance sound and level of vibration Abnormal aspects relating to the rotating equipment should be considered reason to shut dow
6. Resume treatment with the biocide which had been used prior to shut down Utilize the services of the water treatment supplier Maintain the maximum recommended biocide residual for the specific biocide for Operation a sufficient period of time residual and time will vary with the biocide to bring the system under good biological control or e Treat the system with sodium hypochlorite to a level of 4 to 5 mg L ppm free chlorine residual at a pH of 7 0 to 7 6 The chlorine residual must be held at 4 to 5 mg L ppm for six hours measurable with standard commercial water test kits If the cooling tower has been in operation and then shut down for a duration of time and not drained perform one of the two previous biocidal treatment programs directly to the cooling water storage vessel cooling tower sump drain down tank etc without circulating stagnant water over the cooling tower fill or operating the cooling tower fan After biocidal pretreatment has been successfully completed cooling water may be circulated over the tower fill with the fan off When biocidal treatment has been maintained at a satisfactory level for at least six hours the fan may be turned on and the system returned to service Resume the standard water treatment program including biocidal treatment Wintertime Operation During operation in subfreezing weather the opportunity exists for ice to form in the colder regions of the tower Your primary conce
7. attempt any service unless the fan motor is locked out Operators of evaporative cooling equipment such as water cooling towers should follow maintenance programs which will reduce to an absolute minimum the opportunity for bacteriological contamination US Public Health Service publications have recommended that good housekeeping procedures be followed such as regular inspections for concentrations of dirt scale and algae periodic flushing and cleaning and the following of a complete water treatment program including biocidal treatment See Tower start up instruc tions on page 10 13 Note 14 Maintenance The visual inspection should take place at least once a week during the operat ing season The periodic flushing and cleaning should be done before and after each cooling season but in any event at least twice a year The louvers drift eliminators and easily accessible fill surfaces should be flushed by use of a moderate pressure water nozzle being careful not to cause physical damage A reliable water treatment program should be installed and maintained Filtra tion devices may be employed to reduce the suspended solids concentrations thus increasing the effectiveness of the water treatment program Blowdown Acooling tower cools water by continuously causing a portion of it to evaporate Although the water lost by evaporation is replenished by the makeup system it exits the tower as pure water leaving behi
8. D system and repairing any damage that may have occurred during its operation SPX Cool ing Technologies does not assume responsibility for any technical support or damages for problems associate with non Marley brand VFD systems Changing the operational fan speed from the factory settings could cause the fan to operate in an unstable region which may result in damage to the equipment and possible injury Mechanical Equipment Always make certain that mechanical equipment is inoperable during periods of maintenance or during any situation of possible endangerment to personnel If your electrical system contains a disconnect switch lock it out until the period of exposure to injury is over 1 Check the Geareducer oil level at the sight glass near the motor If oil is required fill to the proper level 2 Spin the fan manually to assure that all fan blades properly clear the inside ofthe fan cylinder Observe the action of the driveshaft couplings to be sure that the motor and Geareducer are properly aligned If necessary correct the alignment in accordance with the included driveshaft manual 3 Momentarily energize bump the motor and observe rotation of the fan The fan should rotate in a counterclockwise direction when viewed from below If rotation is backwards shut off the fan and reverse two of the three primary leads supplying power to the motor m A Caution Note Installation If tower is equipped with a tw
9. S 66213 UNITED STATES 913 664 7400 spxcooling spx com spxcooling com In the interest of technological progress all products are subject to design and or material change without notice 2009 SPX Cooling Technologies Inc Printed in USA M92 1333H
10. ach wintertime shutdown period If tower basin is drained verify that all basin heaters have been shut off either by automatic cutoff or disconnect switch A Warning Maintenance Water Treatment and Blowdown Maintaining Water Quality The materials used in the QuadraFlow tower are selected to offer long corrosion free service in a normal cooling tower environment defined as follows e Circulating water with a pH between 8 a chloride content as NaCl below 750 ppm a sulfate content SO below 1200 ppm a maximum inlet water temperature not to exceed 125 F no significant contamina tion with unusual chemicals or foreign substances and adequate water treatment to minimize scaling e Chlorine if used shall be added intermittently with a free residual not to exceed 1 ppm maintained for short periods Excessive chlorine levels may deteriorate sealants and other materials of construction e An atmosphere surrounding the tower no worse than moderate indus trial where rainfall and fog are no more than slightly acid and they do not contain significant chlorides or hydrogen sulfide 5 Cooling Tower Cleaning Any evaporative type cooling tower must be thoroughly cleanedona regular basis to minimize the growth of bacteria including Legionella Pneumophila to avoid the risk of sickness or death Service per sonnel must wear proper personal protective equipment during de contamination Do NOT
11. ater treatment expert before startup Remove any and all accumulated debris from tower Pay particular attention to inside areas of cold water basin entire hot water basin and hot water inlet Make sure that cold water suction screens are clear and installed in place Fill the water system to an approximate depth of 3 in the elevated section of the cold water basin This is the recommended operating water level Adjust the float valve so that it is essentially closed at that level Continue filling the system until the water reaches a level approximately below the lip of the overflow Start your pump s Observe system operation Since the water system external to the tower will have been filled only to the level achieved in the cold water basin a certain amount of pump down of the basin water level will occur before water completes the circuit and begins to fall from the fill The amount of initial pump down may be insufficient to cause the float valve to open However you can check its operation by pressing down on the operating lever to which the stem of the float valve is attached Continue pump operation for about 15 minutes after which it is recom mended that the water system be drained flushed and refilled in order to clean the system While operating the condensing water pump s and prior to operating the cooling tower fan execute one of the two alternative biocidal treatment programs described in the following e
12. ater temperature attainable under any operating circumstance 2 Air Wet Bulb Temperature Cold water temperature will also vary with the wet bulb temperature of the air entering the louvered faces of the tower Reduced wet bulb temperatures will result in colder water temperatures However the cold water temperature will not vary to the same extent as the wet bulb For example a 20 F reduction in wet bulb may result in only a 15 F reduction in cold water temperature Note Note Installation 3 Water Flow Rate Increasing the water flow rate GPM will cause a slight elevation in cold water temperature while reducing the water flow rate will cause the cold water temperature to lower slightly However at a given heat load see formula above GPM reductions also cause an increase in the incoming hot water temperature Use care to prevent the hot water from exceeding 125 F in order to prevent damage to the tower components 4 Airflow Rate Reducing airflow through the tower causes the cold water temperature to rise This is the approved method by which to control leav ing water temperature If your tower is equipped with a single speed motor the motor may be shut off when the water temperature becomes too cold This will cause the water temperature to rise When the water temperature then becomes too warm for your process the motor can be restarted Fan cycling limits Considering the normal fan and motor sizes utilize
13. d MCW towers anticipate that approximately 4 to 5 starts per hour are allowable If your tower is equipped with a two speed motor greater opportunity for temperature control is afforded you When the water temperature becomes too cold switching the fan to half speed will cause the cold water temperature to rise stabilizing at a temperature a few degrees higher than before With a further reduction in water temperature the fan may be cycled alternately from half speed to off Do not start the motor more than four to five times per hour each low speed start and each high speed start count as one start If your tower consists of two or more cells cycling of motors may be shared between cells increasing your steps of operation accordingly For greater insight on cold water temperature control please read Marley Technical Report H 001 A Cooling Tower Energy and its Management available for download at spxcooling com A Warning 10 Operation Tower Start Up Among other sources outbreaks of Legionnaires Disease have reportedly been traced to cooling towers Maintenance and water treatment procedures that prevent amplification and dissemination of Legionella and other airborne bacteria should be formulated and implemented BEFORE systems are operated and continued regularly thereafter to avoid the risk of sickness or death Water System 1 New installations should be cleaned and treated with biocides by a w
14. drive is being commanded to run and the load side is cycled ON and OFF with the safety switch this may damage the VFD Using a VFD in cooling applications has advantages over traditional single or two speed motor control A VFD can reduce the cost of electrical energy being used and provide better temperature control In addition it reduces the mechanical and electrical stress on the motor and mechanical equipment Electrical savings can be large during periods of low ambient temperature when the cooling requirement can be satisfied at reduced speeds To benefit from these advantages it is important that the drive be installed correctly Marley supplies VFD and VFD controls specifically designed for our cool ing products If you have purchased a Marley VFD and or controls package please follow the instructions in the User Manual for that system Most VFD A Warning A Warning A Warning Installation problems can be avoided by purchasing the Marley drive system If you are installing a VFD other than the Marley drive please refer to that drives instal lation manual Improper use of a VFD may cause damage to equipment or personal injury Failure to correctly install the VFD drive will automatically void all warranties associated with the motor and any equipment that is either electrically or mechanically directly attached to the VFD drive system The length of this warranty avoidance will be contingent on properly installing the VF
15. e of damage in shipment If damage is apparent note the freight bill accordingly This will support your future recovery claim Tower Assembly Your Marley sales representative is able to provide for the tower assembly by SPX s construction division or through a qualified subcontractor Our subcon tractors provide safe efficient assembly which complies with all requirements for five year warranty protection of your tower by SPX Motor Wiring Wire motor leads as shown on the motor nameplate matching the supply voltage Do not deviate from the motor nameplate wiring Either of following symbols may be shown on the motor nameplate A AA Y or YY These symbols represent how the motor is constructed on the inside and in no way have anything to do with a Delta or Wye electrical distribution system serving the motor When using a starter e Set motor overload protection to 110 of motor nameplate amps This setting allows the fan motor to operate during cooler weather During cooler weather it is common for the motor to draw 6 to 10 higher than the nameplate amps High amps are common during tower commissioning when the tower is dry and the ambient air temperature is cool Do not start the motor more than four to five times per hour Short cycling the tower will cause fuses breakers or O L s to operate and will decrease motor life When using a two speed starter e Motor rotation must be the same at slow speed and high speed
16. ent Parts With the exception of the motor every component of your tower is designed and manufactured by SPX Cooling Technologies We do this because com mercially available components have not proved capable of withstanding the harsh environment of a cooling tower nor do they contribute their share to the thermal capability and operating characteristics intended A complete stock of all parts and components is maintained at one or more of the various Marley plants In cases of emergency they can normally be shipped within 24 hours by air freight if necessary However you would obviously benefit from anticipating your need in advance thus avoiding the cost of special handling Be sure to mention your tower serial number from the tower nameplate when ordering parts Refer to assembly manual for part identification Periodic Maintenance You may wish to contract with Marley for regularly scheduled visits for the purpose of inspecting and reporting your tower s condition to make recom mendations intended to prevent emergencies and to perform maintenance considered outside the norm This service is not intended to replace the important function performed by your maintenance staff Their attention assures the tower s routine operating performance and is invaluable However Marley recognizes that the unusual manner in which a cooling tower performs its function as well as the unique forces which act upon it may be consideratio
17. escribed on the fan nameplate Clean and disinfect cooling tower with biocides Systems with biofouling high general bacterial counts or positive cultures of legionella may require additional cleaning Refer to Cooling Tower Cleaning section on page 13 Consult your water treatment expert as to prudent biological evaluation testing To maintain five year change intervals use only oil designed specifi cally for these Geareducers If after five years turbine type mineral oil is used the oil must be changed semiannually Refer to Geareducer User Manual for oil recommendations and further instructions Annually Inspect the tower thoroughly making maximum use of instructions given in the separate service manuals Check structural bolted connections and tighten as required Make preventive maintenance repairs as necessary Every 5 Years Change Geareducer oil Refer to Geareducer User Manual for instructions Maintenance Schedule Maintenance Service Monthly Semi annually Seasonal Startup or Annually Inspect General Condition and Operation Observe Operation of Mechanical motor fan and drive mechanism Makeup valve if equipped x x Inspect for unusual noise or vibration x x Inspect and Clean Air inlet x x PVC drift eliminators Distribution basin nozzles and collection basin x Fan motor exterior Check Col
18. essible by removing motor cover 24000 models do not have a motor cover on the exterior of the tower 2 Relubricate motor according to the manufacturer s instructions Fiberglass Components Check all fiberglass parts for exposed glass fibers If found the affected surfaces should be roughened up and solvent wiped Surfaces must be clean and dry and free of oil grease or other contaminants before applying new coating The best coating system requires using a two part polyamide epoxy primer to promote adhesion and a two part acrylic poly urethane enamel for the topcoat Contact your Marley sales representative if additional information is required Prolonged Shutdown If shutdown period is longer than seasonal contact your Marley sales engineer for additional information 19 20 Maintenance Additional Services SPX s interest in your Marley QuadraFlow cooling tower does not end with the sale Having conceived designed and manufactured the most reliable and longest lasting cooling tower of its class we want to make sure that you gain the maximum possible benefit from its purchase Therefore the following services are available which are intended to assure the maximum possible service life under your operating conditions tailor the operating characteristics to your specific needs and maintain consistent op timum thermal performance capability They are available by contacting your Marley sales representative Replacem
19. et cold water temperature produced by the entire tower 2 As cold air enters the louvers it causes the falling water to be drawn inward toward the center of the tower Thus under fan operation the louvers and lower periphery of the tower structure remain partly dry seeing only random splashing from within the tower plus normal atmospheric moisture from the entering air Such lightly wetted areas are most subject to freezing Although ice is unlikely to cause structural damage to the fill it may build up sufficiently to restrict the free flow of air through the louvers This will have the effect of reducing the tower s thermal performance efficiency When excessive ice forms on the louvers stop the fan for a few minutes With the fan off the increase in the water temperature and the action of the cascading water will reduce the ice buildup on the louvers Intermittent Wintertime Operation If periods of shutdown nights weekends etc occur during freezing weather measures must be taken to prevent the water in the cold water basin and all exposed pipework from freezing Several methods are used to combat this including automatic basin heater systems available from Marley It is recom mended that you discuss your freeze prevention options with your local Marley sales representative Unless some means of freeze prevention is incorporated into your system the tower basin and exposed pipework should be drained at the beginning of e
20. etailed information on a variety of cooling tower operation and service topics available to download at spxcooling com For complete parts and service assistance contact the Marley sales or representative office in your area If you need help locating the office nearest you please phone 913 664 7400 or check the web at spxcooling com 21 Troubleshooting Trouble Cause Motor will not start Power not available at motor terminals Remedy 1 Check power at starter Correct any bad connections between the control apparatus and the motor 2 Check starter contacts and control circuit Reset overloads close contacts reset tripped switches or replace failed control switches 3 If power is not on all leads at starter make sure overload and short circuit devices are in proper condition Wrong connections Check motor and control connections against wiring diagrams Low voltage Check nameplate voltage against power supply Check voltage at motor terminals Open circuit in motor winding Check stator windings for open circuits Motor or fan drive stuck Disconnect motor from load and check motor and Geareducer for cause of problem Rotor defective Look for broken bars and rings Unusual motor noise Motor running single phase Stop motor and attempt to start it Motor will not start if single phased Check wiring controls and motor Motor leads connected incorrectly Check motor connecti
21. lean of debris Overpumping Reduce water flow rate to tower to design conditions Cold water too warm Overpumping Reduce water flow rate to tower to design conditions See Tower Operation Not enough air 22 Check motor current and voltage to be sure of correct contract horsepower Clean louvers fill and eliminators Troubleshooting Trouble Cause Remedy Unusual fan drive Loose bolts and cap screws Tighten all bolts and cap screws on all mechanical equipment vibration and supports Unbalanced driveshaft or worn couplings Make sure motor and Geareducer shafts are in proper alignment and match marks properly matched Repair or replace worn couplings Rebalance driveshaft by adding or removing weights from balancing cap screws See Driveshaft Service Manual Unbalanced fan Be sure blades are properly positioned in correct sockets See match numbers Make certain all blades are as far from center of hub as safety devices permit All blades must be pitched the same See Fan User Manual Clean off deposit buildup on blades Worn Geareducer bearings Check fan and pinion shaft endplay Replace bearings as necessary Unbalanced motor Disconnect load and operate motor If motor still vibrates rebalance rotor Bent Geareducer shaft Motor runs hot Motor overload wrong voltage or unbalanced voltage Check fan and pinion shafts with dial indicator Replace if necessary
22. lection water basin level Blowdown adjust as required x x Geareducer Drive Check for loose fasteners including oil drain plug x Check for repair oil leaks x x Check oil level x x Change oil R Make sure vent is open x Check driveshaft alignment x Check for loose driveshaft or coupling fasteners x Check driveshaft flex element for unusual wear x x Lube lines Check for oil leaks in hoses or fittings x x Fan Check and tighten blade and hub fasteners x Check fan blade pitch and tip clearance x Check fan cylinder for loose fasteners x Motor Lubricate grease as required R Check mounting bolts for tightness x Operate at least 3 hours a month 3 hours a month 3 hours a month Basin Heater if equipped Check for proper operation of temp low water level sensor x Inspect clean buildup of contaminant from sensor x x Structure Inspect tighten all fasteners Inspect and touch up all metal surfaces x R Refer to Component User Manual Note It is recommended at least weekly that the general operation and condition be observed Pay attention to any changes in sound or vibration that may signify a need for closer inspection 17 A Warning 18 Maintenance Seasonal Shutdown Instructions When the system is to be shut down for an extended period of time it is recommended that the entire system cooling tower system piping heat exchangers etc be drained
23. n the tower until the problem can be located and corrected Observe operation of the motor driveshaft Geareducer and fan Become familiar with the normal operating temperature of the motor as well as the sight and sound of all components as a whole Check Geareducer oil level Shut down the unit and allow 5 minutes for the oil level to stabilize Add oil if required Check system for leaks if the amount of oil required appears unusual If oil is added at the external fill port allow adequate time for the level to stabilize before reading final level 15 Note 16 Maintenance Inspect louvers drift eliminators and basin trash screens and remove any debris or scale which may have accumulated Replace any damaged or worn out components Use of high pressure water may damage the eliminator and louver material Observe operation of the float valve Depress the operating lever to make sure that the valve is operating freely Inspect the suction screen for plugging Remove any debris that may have accumulated Check for any buildup of silt on the floor of the cold water basin Mentally note the amount if any so future inspections will enable you to determine the rate at which it is forming Semi Annually Relubricate motor according to the manufacturer s instruc tions See instructions on page 19 Check to see that all bolts are tight in the fan and mechanical equipment region including the fan guard Use torque settings pr
24. nal Information a avviLat eke re tete teka aea ta sanas se sanas asse satan anne 21 Troubleshooting a inpe kapa anken ankinn di 22 Indicates presence of a hazard which can cause severe personal injury death or substantial property damage if ignored Indicates presence of a hazard which will or can cause personal injury or property damage if ignored Indicates special instructions on installation operation or main tenance which are important but not related to personal injury hazards A Warning Installation The Marley QuadraFlow cooling tower purchased for this installation repre sents the current state of the art in corrosion resistant cooling tower design and construction The QuadraFlow represents a major step forward in low maintenance long life cooling towers These instructions as well as those offered separately on motors fans Geareducers driveshafts float valves etc are intended to assure that the tower serves you properly for the maximum possible time Since the Quadra Flow s warrantability may well depend upon your actions please read these instructions thoroughly prior to operation If you have questions about the operation and or maintenance of this tower and you don t find the answers in this manual please contact your Marley sales engineer When writing for information or when ordering parts please mention tower serial number shown on the tower s nameplate To
25. nd its burden of dissolved solids to concentrate in the remaining water Given no means of control this increasing concentration of contaminants can reach a very high level In order to achieve water quality which is acceptable to the cooling tower as well as the remainder of your circulating water system the selected water treatment company must work from a relatively constant level of concentra tions This stabilization of contaminant concentrations is usually accomplished by blowdown which is the constant discharge of a portion of the circulating water to waste As a rule acceptable levels on which to base a treatment schedule will be in the range of 2 4 concentrations The following table gives approximate rates of blowdown percent of total water flow rate constantly wasted to achieve those concentrations at various cooling ranges Blowdown Rate Cooling Two Four Range F Concentrations Concentrations 10 0 7 0 17 15 1 1 0 30 20 1 5 0 43 Range Difference between hot water temperature entering the tower and cold water tempera ture leaving the tower When water treatment chemicals are added they should not be in troduced into the circulating water system via the cold water basin of the cooling tower Water velocities are lowest at that point which results in inadequate mixing A Warning A Warning Maintenance Schedule of Tower Maintenance Included with this instruction packet are separate Service
26. ns which occasionally require the services of an expert technician Additional Information Increased Load Requirements QuadraFlow towers are designed such that cells of either equal or unequal capacity can be added in the future This allows you to compensate for the load increases that normally occur with the replacement or addition of production equipment and still retain continuity with respect to your cooling tower system Tower Renewal Marley routinely rebuilds and upgrades cooling towers of all materials and manufacture If your tower ever reaches the limit of its service life we recommend that you investigate the cost of rebuilding before you routinely order a new replacement tower Each QuadraFlow tower includes a document package containing general orientation drawings and manuals to accomplish field assembly and instal lation These drawings and manuals contain important information relating to safe installation and operation of the cooling tower A separate installation drawing for each purchased option is included in the document package If you have purchased an option and can t find the ap propriate installation drawing contact your local Marley sales representative before proceeding SPX also provides several sets of a separate packet of pertinent operating and maintenance manuals The manuals vary somewhat depending on the tower model purchased In addition SPX publishes numerous technical reports including more d
27. o speed motor check for proper rota tion at both speeds Check also to see that starter is equipped with a 20 second time delay which prevents direct switching from high speed to low speed This delay will allow the fan to slow down and will prevent abnormal stress from being applied to the mechanical equipment and the electrical circuit components 4 Runthe motor and observe the operation of the mechanical equipment Opera tion should be stable and there should be no evidence of oil leakage If the water supply system is not being operated or if there is no heat load on the system motor amps read at this time may indicate an apparent overload of as much as 10 20 This is because of the increased density of unheated air flowing through the fan Deter mination of an accurate motor load should await the application of the design heat load General The cold water temperature obtained from an operating cooling tower will vary with the following influences 1 Heat Load With the fan in full operation if the heat load increases the cold water temperature will rise If the heat load reduces the cold water temperature will reduce Heat Load Btu hr Range F GPM x 500 Note that the number of degrees range through which the tower cools the water is established by the system heat load and the amount of water being circulated in accordance with the following formula The cooling tower establishes only the cold w
28. ons against wiring diagram on motor Bad bearings Electrical unbalance Check lubrication Replace bad bearings Check voltage and currents of all three lines Correct if required Air gap not uniform Check and correct bracket fits or bearing Rotor unbalance Rebalance Cooling fan hitting end bell guard Reinstall or replace motor fan Fan noise Blade rubbing inside of fan cylinder Adjust cylinder to provide blade tip clearance Loose bolts in blade clamps Check and tighten if necessary Check fan blade pitch Refer to Fan Service Manual Scale or foreign sub Lack of or insufficient bleed off See Water Treatment section of this manual stance in water system Water treatment Consult competent water treating specialist See Water Treatment section of this manual Motor does not come up to speed Voltage too low at motor terminals because of line drop Check transformer and setting of taps Use higher voltage on transformer terminals or reduce loads Increase wire size or reduce inertia Broken rotor bars Look for cracks near the rings A new rotor may be required Have motor service center check motor Wrong rotation Motor Wrong sequence of phases Switch any two of the three motor leads Excessive water drift Faulty drift elimination 1 See if all louvers and eliminators are in place and clean 2 Check to see that nozzles are in place and c
29. rn is to prevent the formation of destructive ice on the cooling tower fill Your understanding of cold weather operation will be enhanced if you read Marley Technical Report H 003 Operating Cooling Towers in Freezing Weather available for down load at spxcooling com augmented by the following guidelines 1 Do not allow the tower s leaving water temperature to drop below a minimum allowable level about 40 F established as follows During the coldest days of the first winter of operation observe whether any ice is forming on the louver face particularly near the bottom of the louver face If hard ice is present on the louvers an appropriate elevation in the allowable cold water temperature is mandatory If the coldest pos sible water is beneficial to your process ice of a mushy consistency can be tolerated but routine periodic observation is advisable If the minimum allowable cold water temperature is established at or near minimum heat load it should be safe for all operating conditions 4 11 A Caution A Warning 12 Operation Having established the minimum allowable cold water temperature maintaining that temperature can be accomplished by fan manipulation as outlined in Item 4 under Tower Operation on page 8 However in towers of more than one cell the limiting temperature established applies to the water temperature of the cell or cells operating at the highest fan speed not necessarily the n
30. wer Location Space available around the tower should be as generous as possible to pro mote ease of maintenance and to permit freedom of airflow into and through the tower If you have questions about the adequacy of the available space and the intended configuration of the tower please contact your Marley sales engineer for guidance Prepare a stable level support foundation for the tower utilizing weight wind load and dimensional information appearing on appropriate Marley submittal drawings Supports must be level to insure proper operation of the tower The cooling tower must be located at such distance and direction to avoid the possibility of contaminated tower discharge air being drawn into building fresh air intake ducts The purchaser should ob tain the services of a Licensed Professional Engineer or Registered Architect to certify that the location of the tower is in compliance with applicable air pollution fire and clean air codes Tower Shipment QuadraFlow towers ship by truck on flat bed trailers in an unassembled condition Single cell towers ship on one truck Multicell towers depending on their size may require more than one truck Responsibility for the condition of the tower upon its arrival belongs to the trucker as does the coordination of multiple shipments if required Note Installation Receiving Tower Prior to unloading the tower from the delivering carrier inspect the shipment for evidenc
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