Marley Matrix Multiflow cooling tower user manual
Contents
1. Normal operating water depth in aconcrete basin is at the base of the bottom fill sheets Normally 1 6 below the top of the basin curb FAN DRIVE When using two speed motors allow a time delay of a minimum of 20 seconds after de energizing the high speed winding and before energizing the low speed winding Tremendous stresses are placed on driven machinery and motors unless the motors are allowed to slow to low speed RPM or less before the low speed winding is energized COLD WEATHER OPERATION During operation in subfreezing weather the opportunity exists for ice to form in the colder regions of the tower Your primary concern 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 Operating Cooling Towers in Freezing Weather Marley Technical Report H 003 continues A Caution Ice forming characteristics on any given cooling tower will vary depending on velocity and direction of wind circulating water rate and heat load Excessive ice formation may be controlled by regulating air and water flow through the tower by one or more of the following procedures ech Shut the fan down This reduces the cooling air rate to a minimum and increases the quantity of warm water at the air inlet to a maximum Except for extreme cold conditions or extended freezing conditions this procedure will normally control ice formation 2 When a co2. m D o W 03 D Ke 5 ss DI o 5e 2 e E LL oO Oo CH 9 6 5 Ze OO SH e o A g Zo B w x e 5 S om x SS e Ll E SSR 22e SZ SS EDE s SS SZ Ss amp UL GO Om Oo CC oO oO o a 1 Inspect for clogging M IM W W 2 Check for unusual noise or vibration D D D 3 Inspect keys keyways and set screws S S S 4 Make sure vents are open 5 Lubricate grease R S 6 Check oil seals M 7 Check operating oil level D 8 Check static oil level M 9 Check oil for water and sludge M 10 Change oil S 11 Check fan blade tip clearance S 12 Check water level D D 13 Check for leakage W S 14 Inspect general condition SISISIS Y YISI SISJ YJSIS 15 Tighten loose bolts S S S 16 Clean RIRJRI RI RIR S RIRIRIR 17 Repaint R R RIR 18 Rebalance R R 19 Inspect repair for safe use Y Y Y 20 Inspect and repair before each use R D Daily W Weekly M Monthly Q Quarterly S Semiannually Y Yearly Has Required 16 Tower Schematic FAN ASSEMBLY GEAREDUCER MOLDED FRP FAN CYLINDER DRIVE SHAFT MOTOR NLET HEADER MOLDED Ge FRP ENDWALL SPLASHBOX CASING NLET DOWNCOMER PIPE PVC FILM FILL MOLDED FRP COLLECTION BASIN CONCRETE COLD WATER BASIN RETURN PIPE 17 Inspection Checklist Date Inspected Owner Owner s Tower Designation Tower Manufacturer Process Served by Tower
3. Have motor service man check motor Troubleshooting Trouble Cause Remedy Wrong Rotation Motor Wrong sequence of phases Geareducer Noise Geareducer bearings Change any two of the three motor leads If new see if noise disappears after one week of operation Drain flush and refill Geareducer See Geareducer Service Gears Manual If still noisy replace Correct tooth engagement Replace badly worn gears Unusual Fan Drive Loose bolts and cap screws Replace gears with imperfect tooth spacing or form Vibration Tighten all bolts and cap screws on all mechanical equipment Unbalanced drive shaft or worn and supports couplings Make sure motor and Geareducer shafts are in proper alignment and match marks properly matched Repair or replace worn couplings Rebalance drive shaft by adding or removing weights from balancing cap screws See Drive Shaft Fan Service Manual Make certain all blades are as far from center of fan as safety devices permit All blades must be pitched the same See Fan Worn Geareducer bearings Service Manual Clean off deposit build up on blades Check fan and pinion shaft endplay Replace bearings as Unbalanced motor necessary Disconnect load and operate motor If motor still vibrates Bent Geareducer shaft rebalance rotor Fan Noise Check fan and pinion shaft with dial indicator Replace if Loose fan hub cover necessary Blade rubbing inside of fan cylind
4. Ifan Amertap condenser tube cleaning systemis part of plant equipment care should be taken during operation to back wash the strainer section only after the sponge rubber cleaning balls are removed from the system by trapping them in the collector If the balls are allowed to enter the cooling tower supply piping they can clog the plastic metering orifices Clogged orifices will cause unequal water distribution over the fill which will affect thermal performance Extensive clogging can lead to overflowing of the distribution basins and possible ice damage to towers installed in freezing climates The basins should be frequently checked for orifice clogging until such time as the operational sequence of the Amertap system assures that no balls enter the cooling tower piping HOT WATER DISTRIBUTION SYSTEM Keep the circulating water and distribution piping and splashboxes clean and free of dirt algae and scale Algae and scale may clog nozzles eliminators fill and piping and may collect on the equipment served thus reducing its performance See warning under Water Treatment section on page 8 Distribution basins can be reached from the fan deck level through access hatches and permanently installed ladders The lower level distribution basins may have an optional interior walkway which would be accessed from the tower stairway COLD WATER COLLECTION BASIN supplied by others Inspect collection basin occasionally for leaks and repai
5. are required the services of reliable water treating companies should be obtained Slime a gelatinous organic growth and algae a green moss may growin the cooling tower or heat exchangers Their presence can interfere with cooling efficiencies Proprietary compounds are available from water treating companies for the control of slime and or algae however compounds which contain copper are not recommended Chlorine and chlorine containing compounds are effective algaecides and slimicides but excess chlorine can damage wood and other organic materials of construction If used chlorine should be added as intermittent or shock treatment only as frequently as needed to control the slime and algae and free residual levels should not exceed one part per million parts water 1 ppm Chlorine and chlorine continues A Warning A Caution 10 containing compounds should be added carefully since very high levels of chlorine may occur at or near the point of entry into the circulating water system FOAMING Heavy foaming sometimes occurs when a new tower is put into operation This type of foaming generally subsides after a relatively short period of operation Persistent foaming can be caused by the concentrations of certain combinations of dissolved solids or by contamination of the circulating water with foam causing compounds This type of foaming can sometimes be minimized by increasing the blowdown but in some cases foam depressant
6. bolted joints in the fan and drive assemblies a Fan hub clamp bolts See Marley Fan Service Manual for correct torque setting b Fan hub cover bolts Where applicable c Geareducer and motor mounting bolts d Drive shaft coupling and guard bolts 5 Check Geareducer oil for sludge or water by draining off and testing a sample as outlined in the Marley Geareducer Service Manual Check Geareducer oil level at oil level mark on the side of the case Add oil as required The oil level placard must be adjusted so that its full mark is at the same elevation as the full mark on the side of the Geareducer case Check oil lines to be sure there are no leaks and all joints are tight See Geareducer Service Manual for oil filling procedure andlistofrecommended lubricants continues A Note A Note A Caution 6 Rotate fan by hand to be sure of free rotation and ample tip clearance See Marley Fan Service Manual 7 Check motor insulation with a Megger See Maintenance Section of Marley Electric Motor Service Manual 8 Lubricate the motor according to motor manufacturer s instructions 9 Test run each fan separately for a short time Check for excessive vibration or unusual noise If either is present refer to the Troubleshooting section on pages 14 amp 15 ofthis manual Fan must rotate clockwise when viewed from above Recheck Geareducer oil level 10 Check functioning of make up water supply 11 Make
7. noted Replace any damaged or worn out Q New cooling towers should be cleaned and treated with biocides by a water treatment expert before startup See your components Cooling Tower User Manual for more Q Workers cleaning units should use detailed instructions on biocidal protective clothing and equipment during treatment decontamination Ata minimum cooling towers should be Although using these practices will not cleaned and disinfected with biocides guarantee that a system or individual twice a year Systems with biofouling or component will not be contaminated by positive cultures of legionella may require legionella they should reduce the chance additional cleaning of colonization OQ Units should be inspected weekly for For additional copies of the tower User bacterial growth and general operating Manual or other literature pertaining to conditions Bacterial growth should be this unit please contact your Marley reported to your water treatment expert sales representative for immediate attention Marley Marley Cooling Technologies 7401 W 129 Street Overland Park Kansas 913 664 7400 Cooling Technologies Manual 99 1342
8. sure the blowdown or bleed off will carry the proper amount of water Starting Procedure FILL THE WATER SYSTEM Fillthe cold water collection basin and circulating water system until the operating water level is reached See Operation Section below Prime and start the circulating water pumps Increase the flow of circulating water gradually to design water flow rate to avoid surges of water hammer which could damage the distribution system piping Cleanthe sump screens several times during the first weeks of operation After this check sump screens weekly When starting in cold weather follow procedures outlined in Cold Weather Operation STARTING FAN Siart the fan After 30 minutes of operating time to permit Geareducer oil to come up to operating temperature check motor load with watt meter or take operating volt and ampere readings and calculate motor HP Refer to Marley Fan Service Manual for instructions Pitch fans to pull correct contract horsepower when circulating design water rate at design hot water temperature Operation Entering water temperature in excess of 125 F may result in fill deformation TOWER PERFORMANCE Keep thecoolingtower clean and water distribution uniform to obtain continued maximum cooling capacity Do not allow excessive deposits of scale or algae to build up on the fill and eliminators Keep the nozzles free of debris to assure correct distribution and cooling of water The capacity of a cooling
9. Matrix Multiflow Owners Manual A Warning A Caution A Note A Note Contents Before Start Up EE page 3 starting Giele TT page 4 Ee e EE page 4 Tower M intenanG crcr page 6 Water Treatment nnn nnnenenneeeneenenseeenenennseeneenenneeneenennne page 8 Spare PAS vases sce sien nde edentate ended eet gie lack dalen See aiat page 11 Seasonal Shutdown Instructions page 11 Cooling Tower Cleaning nnn eenen enenennnene vennen page 13 TMOUDIESNOOUNO EE page 14 SONT verteren eats net eege deeg page 15 Inspection and Maintenance nnn nennen enen page 16 Tower gleef annet eren nde At page 17 Inspection Checklist nnee er ennen enneeerenneernnenenenens page 18 The following defined terms are used throughout this manual to bring attention to the presence of hazards of various risk levels or to important information concerning the life of the product 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 maintenance which are important but not related to personal injury hazards These instructions assist in obtaining efficient long life from Marley cooling equipment Direct questions concerning cooling tower operation and maintenance to your Marley sales office or representative Alway
10. Serial No Design Conditions GPM HW Number of Fan Cells Operation Continuous LU Intermittent LJ Seasonal Q F WB F Condition 1 Good 2 Keep an eye on it 3 Needs immediate attention Structure Casing Material Comments Structural Material Fan Deck Material Stairway Material Ladder Material Handrails Material Interior Walkway W Material Cold Water Basin Material Water Distribution System Distribution Basin Material Inlet Pipe Material Inlet Manifold Material Branch Arms and Downcomers Distribution Cones Splashboxes Nozzles Orifice diameter inches Heat Transfer System Fill Louver Face of Fill Eliminator Face of Fill Use this space to list specific items needing attention 18 Inspection Checklist Mechanical Equi Gear Drive Units Manufacturer Model Ratio Condition 1 Good 2 Keep an eye on it 3 Needs immediate attention pment ENEN EN Comments Oil Level Full Add Immediately Low check again soot Oil Condition Oil Used type Seals Good Jl Contains WaterL Contains Metal Contains SludgeL Back Lash Fan Shaft End Play Any Unusual Drive Shafts Noises Nod Yes U Action Required Manufacturer Matera ELLE PT Fans Manufacturer Fixed Pitch L Adjustable Pitch Dia
11. ainst nameplate Overload values Check fan blade pitch See Fan Service Manual Check for Wrong motor RPM drag in fan drive train as from damaged bearings Check nameplate against power supply Check RPM of motor Bearings overgreased and gear ratio Remove grease reliefs Run motor up to speed to purge Rotor rubs stator bore excessive grease Wrong lubricant in bearings If not poor machining replace worn bearing Change to proper lubricant See motor manufacturer s One phase open instruction Stop motor and attempt to start it Motor will not start if single Poor ventilation phased Check wiring controls and motor Clean motor and check ventilation openings Allow ample Winding fault ventilation around motor Bent motor shaft Check with Ohmmeter Insufficient grease Straighten or replace shaft Deterioration of or foreign material in grease Remove plugs and regrease bearings Flush bearings and relubricate Bearings damaged Incorrect fan blade pitch Replace bearings Motor Does Not Come Up Voltage too low at motor terminals To Speed because of line drop See Fan Service Manual for blade pitching instructions Check transformer and setting of taps Use higher voltage on transformer terminals or reduce loads Increase wire size or Broken rotor bars reduce inertia Look for cracks near the rings A new rotor may be required 14
12. chemicals must be added to the system Foam depressants are available from a number of chemical companies WATER DISCOLORATION Wood contains some water soluble substances and these commonly discolor the circulating water on a new tower This discoloration is not harmful to any of the components in the system and can be ignored However a combination of foaming and discolored water can result in staining of adjacent structures if foam is picked up by air being pulled through the tower and discharged out the fan cylinders Avoid operation of fans until the foaming is controlled MAINTENANCE OF FILL PERFORMANCE Owner must keep water clean by treatment screening or filtering to avoid the possibility of fill clogging and loss of thermal performance Entering water temperature in excess of 125 F may result in fill deformation Potential Causes of Fill Clogging Suspended materials Trash airborne particles dust fly ash etc Scale Can be sulfates silicates carbonates or oxides Scaling effects can be accentuated by suspended muds Algae and or Slime Can control with chlorine or non oxidizing biocides Possible Sources of Scale Calcium Sulfate From make up and sulfates produced by sulfuric acid for pH adjustment Calcium sulfate should be kept below 1000 ppm expressed as CaC03 Calcium Carbonate Generally will not form scale in the cooling tower if carbonate scaling does not occur in the condenser Exceptions If ma
13. er Tighten hub cover fasteners Loose bolts in blade clamps Adjust cylinder to provide blade tip clearance Check and tighten if necessary Safety The tower has been designed to provide a safe working environment while either operating or shut down The ultimate responsibility for safety rests with the Operator and Owner When flow to the tower is shut off or when portions of the tower require maintenance temporary safety barricades may be required around openings Other safety precautions such as safety harnesses should be utilized where appropriate for compliance with OSHA regulations and standards and good safety practices Routine periodic maintenance must be performed on all personnel access and material handling accessories in accordance with the following schedule Ladders Stairways Walkways Handrails Covers Decks and Access Doors Davits Derricks and Hoists Inspect for General Condition Semi annually Semi annually Inspect and Repair for Safe Use Yearly Inspect and Repair Before Each Use As Required 15 Inspection and Maintenance Schedule General Recommendations More frequent inspection and maintenance may be desirable 2 T Ke C oO I g O 8 KR 8 8 Sg 8 5 iL Di x 36 es gt E 5 SS ZS gt gt ap E Hd u O 2 3 o DE wo lt E fo
14. ke up water contains surplus free carbon dioxide scaling may be inhibited in the condenser but may occur in the tower fill because of CO stripping Silicates and Oxides Silica scale is virtually impossible to remove Silica scale is unlikely if SiO is held below 150 ppm Oxides such as iron oxide can coat all parts of the system if soluble iron is present in concentrations above 0 5 ppm Iron oxides do not usually develop into thick scales but can accentuate the development of other scales Spare Parts Marley manufactures and maintains a stock of replacement parts for all cooling tower mechanical equipment Shipment of these parts are normally made within ten days after an order is received If emergency service is necessary contactthe local Marley sales office or representative for assistance To prevent prolonged shutdown periods in case of damage to the mechanical equipment it is suggested that the following parts be carried in the owner s stock 1 One fan assembly 2 One Geareducer assembly 3 One drive shaft assembly Be sure to furnish the tower serial number when ordering parts Seasonal Shutdown Instructions Tower Drain all tower piping During shutdown clean the tower and make any necessary repairs Apply protective coating as required to all metal parts Particular attention should be given to mechanical equipment supports drive shaft and drive shaft guards continues 11 12 Visually inspect for
15. meter Number of Blades Blade Materi Hub Material Hub Cover Material Blade Assembly Hardware Blade Tip Clearance ______ min Vibration Level Fan Cylinder Hei Mech Egpt Sup Oil Fill amp Drain Li Oil Level Sight Glass Vibration Limit Switches Other Components Motor Manufacturer al max ght port Mat nes Name Plate Data HP RPM Phase Cycle Volts F L Amps Frame S F Special Info Last Lubrication Date Grease Used Type Any Unusual Any Unusual Vibration No Any Unusual Heat Build up No Noise No Yes Action Required Yes Action Required OULU OUD Yes Action Required 19 The Marley Cooling Tower Company 5800 Foxridge Drive Mission KS 66202 913 362 1818 MARLEY CG SERVICE MARLEY COOLING TECHNOLOGIES INC Health Alert Among other sources outbreaks of Legionnaires Disease have reportedly been traced to cooling towers Maintenance 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 The following is recommended QO Do NOT attempt any service unless the Q Drift eliminators should be inspected fan motor is locked out monthly Any debris or scale should be cleaned off the eliminators when
16. oling tower has two speed motors operate the fans at half speed forward This reduces the cooling air rate heat transfer and increases the quantity of warm water at the air inlet 3 With no heat load on the circulating water icing cannot be controlled Towers must not be operated with reduced water rate and or no heat load during freezing weather If a bypass directly into the cold water basin is used all water must be bypassed Reverse operation of fans is not recommended See Fan Drive for fan speed change precautions INTERMITTENT OPERATION When the unit is operated intermittently during winter weather it is necessary that the water be drained from the tower piping to insure protection against freezing and possible rupture Tower Maintenance Well maintained equipment gives the best operating results and the least maintenance cost Marley recommends setting up a regular inspection schedule to insure effective safe operation of the cooling tower Use the schedule on page 16 to obtain continuously good performance with the least tower maintenance See Cooling Tower Inspection Check List in this manual pages 18 and 19 Keep a continuous lubrication and maintenance record for each cooling tower HOT WATER DISTRIBUTION BASINS Water distribution nozzles in the floor of the hot water basins may be cleaned without shutting down any part of the tower Remove dirt algae leaves etc from the basins or nozzles A Caution
17. r if necessary Keep cold water outlets clean and free of debris Make up and circulating water controls must operate freely and maintain the desired water quantity in the system TOWER FRAMEWORK Keep framework bolts tightened Pay particular attention to bolts in the mechanical equipment supports Do not pull washers into the wood DRIVE SHAFT Check drive shaft alignment and condition of couplings every six months See the Drive Shaft Service Manual for correcting misalignment balancing or replacing parts ELECTRIC MOTOR Lubricate and maintain each electric motor in accordance with the manufacturer s instructions If repair work is necessary contact the nearest representative of the motor manufacturer See Warranty Section of Marley Service Manual on Electric Motors continues FAN Inspect fan blade surfaces every six months For detailed maintenance information refer to Marley Fan Service Manual GEAREDUCER Make weekly and monthly oil checks Inspect internal parts during seasonal oil change Refer to the Geareducer Service Manual for detailed maintenance instructions PAINTING Periodically clean and if necessary recoat all metal parts subject to corrosion COOLING TOWER WOOD DETERIORATION Treated wood in cooling towers could be damaged by decay anytime after the first year or two of service If decay is discovered and corrected in its early stages serious wood damage canbe prevented Routine inspections should be made to a
18. removal of a portion of the water from the circulating system Blowdown is used to prevent the dissolved solids from concentrating to the point where they will form scale The amount of blowdown required depends upon the cooling range the difference between the hot and cold water temperatures and the composition of the make up water water added to the system to compensate for losses by blowdown evaporation and drift The following table shows the amount of blowdown required to maintain different concentrations with various cooling ranges BLOWDOWN OF CIRCULATING RATE COOLING RANGE F EXAMPLE 7000 GPM circulating rate 15 cooling range To maintain 4 concentrations the required blowdown is 38 or 0038 times 7000 GPM which is 26 6 GPM If tower is operated at 4 concentrations circulating water will contain four times as much dissolved solid as the make up water providing none of the solids form scale or are otherwise removed from the system CHEMICAL TREATMENT Insome cases chemical treatmentofthe circulating water is not required if adequate blowdown is maintained In most cases however chemical treatment is required to prevent scale formation and corrosion Sulfuric acid or one of the polyphosphates is most generally used to control calcium carbonate scale Various proprietary materials containing chromates phosphates or other compounds are available for corrosion control When water treatment chemicals
19. s 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 or 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 connections against wiring diagram on motor Ball bearings Check lubrication Replace bad bearings Electrical unbalance Check voltages and currents of all three lines Correct if Air gap not uniform required Rotor unbalance Check and correct bracket fits or bearing Cooling fan hitting guard Rebalance Motor Runs Hot Wrong voltage or unbalanced voltage Reinstall or replace fan Check voltage and current of all three lines ag
20. s include your tower serial number when writing for information or ordering parts Look for this number on the nameplate on the access door A Note Before Start up CLEANING Remove any dirt and trash which has accumulated in the cold water basin Clean any nozzles that are clogged Remove any sediment from the cold water collection basin sump and screens Use a water hose to flush cold water collection basins OPERATE WATER SYSTEM Start the circulating water pumps Increase the flow of circulating water gradually to match design water flow rate Circulate water over the cooling tower continuously for several days before starting the mechanical equipmentandplacing the cooling tower into continuous operation When starting in cold weather follow procedures outlined in Cold Weather Operation on page 5 INSPECTION Jr is imperative that all operating assemblies be inspected before they are placed in operation The following is alist of components to be checked before starting the tower 1 Check drive shaft alignment Realign if necessary See Marley Drive Shaft Service Manual 2 Check tightness of bolts that attach mechanical equipment support to the tower framing Check tightness of bolts in fan cylinder joints and fan cylinder anchorage Do not pull washers into the wood 3 Check tightness of bolts at diagonals and columns and atgirts and columns in the area between fan and cold water basin 4 Check tightness of the following
21. ssure that decay is discovered before it is heavily advanced Decay is commonly of two very general types soft rot and internal rot Soft rot is easier to detect because it is almost always on the surface of wood members It makes the surface soft and weak andin its more advanced stages the decayed wood can be easily removed This type of rot occurs primarily in the flooded areas of the tower Internal rot as the name implies occurs inside the wood members For this reason it is more difficult to detect than is soft rot Internal rot is most commonly found in the heavier members in the plenum areas of the tower One of the best methods of inspection for internal rot is sounding with hammer blows Members which have internal rot sound dead while non rotted members have a ring or live sound Areas which sound dead can be probed with a screwdriver or other pointed tool to verify the presence of internal rot Marley maintains a laboratory for detailed wood inspections and has personnel on its staff experienced in all aspects of wood deterioration and preservative treatment In addition several Marley publications are available which give detailed information on the subject of wood deterioration and treatment Contact the nearest Marley sales office or representative for more information about wood inspection services and for copies of the publications Water Treatment BLOWDOWN Blowdown or bleed off is the continuous
22. tower to cool water to a given cold water temperature varies with the wet bulb temperature and the heat load applied to the cooling tower As the wet bulb temperature drops the cold water temperature also drops However the cold water temperature does not drop linearly with the wet bulb temperature A cooling tower will not control heat load The flow rate of water circulated through the cooling tower will determine the temperature range of cooling in conjunction with a given heat load The hot water and cold water temperatures will increase with higher heat loads and or high flow rates HOT WATER DISTRIBUTION SYSTEM Keep nozzles clean and in place in distribution basins Adjust water flow to give the same depth in the distribution basins of all cells Design water depth varies from 3 to 8 7 6 cm to 20 3 cm depending upon design circulating water rate If a major change in the quantity of water to be circulated over the tower is made replace the removable nozzles with higher capacity nozzles to maintain the proper water level COLD WATER COLLECTION BASIN A suitable depth must be maintained tokeep the pumps from pulling air into the line The amountof make up water required to keep the water in the collection basin at the required depth depends upon the evaporation loss and blowdown Low operating depths of the water require air baffles under the fill to prevent air bypass Maintain sufficient water depth to prevent cavitation
23. ur Marley sales office or representative for additional information A Warning Cooling Tower Cleaning Any evaporative type cooling tower must be thoroughly cleaned on a regular basis to minimize the growth of bacteria including Legionella Pneumophilla to avoid the risk of sickness or death Service personnel must wear proper personal protective equipment Do NOT 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 Public Health Service officials 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 Visual inspection should take place at least once a week during the operating season Periodic flushing and cleaning should be done at least twice a year Hot water basins and nozzles 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 13 Troubleshooting Trouble Cause Remedy Motor Will Not Start Power not available at motor terminal
24. wood deterioration and test members for soft spots Protect wood towers against fire If tower is wetted for fire protection wet it down continuously alternate wetting and drying is destructive to wood If ambient temperature is 32 F or below do not put cold water on tower Mechanical Equipment Geareducer shutdown for 3 months or less 1 Each month drain water condensate from the lowest point ofthe Geareducer and its oil system Check oil level and add oil if necessary Operate Geareducer to recoat all interior surfaces with oil 2 At start up drain water condensate and check oil level Add oil if necessary Refer to Geareducer Service Manual for maintenance and lubrication instructions Geareducer shutdown for 3 months or longer 1 Ifthe motors have space heaters operate mechanical equipment one hour each month 2 If the motors do not have space heaters operate mechanical equipment one hour each week 3 Atstart up operate mechanical equipment one hour or until oil is warm then shut the equipment down Drain the oil and refill with new oil Refer to Geareducer Manual for instruction on changing oil Refer to Marley Downtime Instruction Manual for downtime of 6 months or longer Electric Motors 1 Donotstart motor without determining that there will be no interference with free rotation of the fan drive 2 Refer to Marley Electric Motor Service Manual 3 If shutdown period is longer than seasonal contact yo
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