SPX Marley NCWD User Manual Download Page 1 | Manualshive

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NC

®

WD

cooling tower

INSTALL ATION - OPERATION - MAINTENANCE

Z0331674_E ISSUED 0 4/2019

READ AND UNDERSTAND THIS MANUAL PRIOR TO OPERATING OR SERVICING THIS PRODUCT.

user manual

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Summary of Contents for Marley NCWD

Page 1: ...NC WD cooling tower INSTALLATION OPERATION MAINTENANCE Z0331674_E ISSUED 04 2019 READ AND UNDERSTAND THIS MANUAL PRIOR TO OPERATING OR SERVICING THIS PRODUCT user manual ...

Page 2: ... cooling tower Carefully read the manual before installation or operation of the tower and follow all instructions Save this manual for future reference Note 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 instr...

Page 3: ...ntenance of this cooling tower and you don t find the answers in this manual please contact your Marley sales representative When writing for information or when ordering parts please include the serial number shown on the cooling tower nameplate Safety First The location and orientation of the cooling tower can affect the safety of those responsible for installing operating or maintaining the tow...

Page 4: ...d 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 representative for guidance Prepare a stable level support foundation for the tower utilizing weight wind load and dimens...

Page 5: ...tion should be kept for future reference and maintenance purposes Hoisting Tower TheNCWDtowerconsistsoftwomodulespercell Theuppermoduleincludes hoisting clips at the top of the module The hoisting clips on the lower module are located near the bottom on the sides of the cold water basin NCWDupperandlowermodulesmustbehoistedandsetseparately Do not preassemble modules prior to hoisting A Hoisting In...

Page 6: ...ottom of top module replace fasteners at side of module to prevent leaks Place top module on the top peripheral bearing surface factory installed gasket of bottom module aligning mating holes as it is set in place Make sure that the orientation of the top module agrees with your intended piping arrangement Sections are 180 reversible with respect to each other At tach top module to bottom module w...

Page 7: ...ps are manufactured of heavy duty FRP fiber reinforced polyester construction Because of their size they are attached upside down in the basin to pre vent damage in shipment They must be inserted into the square opening prepared in the floor of the cold water basin of one or more cells sealed against leakage and attached by machine bolts according to the installa tiondrawingincluded Anappropriatel...

Page 8: ...ot deviate from the motor nameplate wiring Internal space heaters may be present depending upon the motor manu facturer For space heater operation and wiring refer to the Marley Fan Motor User Manual Z0239042 Either of following symbols may be shown on the motor nameplate Δ Δ Δ 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...

Page 9: ...he 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 Program the VFD for variable torque output Flux vector and constant torque modes may damage the gearbox Do not start and stop the moto...

Page 10: ...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 shut off electrical power to the tower fan motor prior to performing any maintenance on the tower Any electrical switches should ...

Page 11: ...everse two of the three primary leads supplying power to the motor If tower is equipped with a two 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 If the fan is intended to be reversed for deicing purposes make sure that the starter is equipped with a 2 minute t...

Page 12: ...expressed as CaCO3 2 Do NOT attempt any service unless the fan motor is locked out 3 Remove any and all accumulated debris from tower Pay particular at tention to inside areas of cold water basin hot water basins louvers and drift eliminators Make sure that cold water suction screens are clear and properly installed 4 Fillthewatersystemtoanapproximatedepthof8 Thisistherecommended operating water l...

Page 13: ... basin intermediate basin and cold water collec tion basin should have from 3 to 5 1 2 water depth with uniform depth from basin to basin Contact your Marley sales representative if you are considering a permanent change in circulating water flow rate that would prevent operation within these limits 8 Continue pump operation for about 15 minutes then open the water valve leading to the plume abate...

Page 14: ...grees 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 water 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 lo...

Page 15: ...re to rise When the water temperature then becomes too warm for your process the motor can be restarted If your tower is equipped with a VFD the system offers better temperature control by varying the fan speed For the most effective plume reduction it is recommended to op erate the fan at full speed when the tower is operating in plume abated mode If fans must be modulated to control temperature ...

Page 16: ...to form in the colder regions of the tower Slushy transitory ice forms routinely in the colder regions of the fill of low temperature towers and is visible through the tower louvers Such ice normally has no adverse effect on tower operation but its appearance should be a signal to the operator to undertake ice control procedures It is the operator s responsibility to prevent the formation of destr...

Page 17: ... forms on the louvers stop the fan for a few minutes With the fan off the water flow will increase in the vicinity of the louvers and reduce the ice buildup 3 Under extended extreme cold conditions it may be necessary to operate the fan in reverse This forces warm air out through the louvers melting any accumulated ice adequate heat load must be available Reversal of fan should only be done at hal...

Page 18: ...n down piping located in the lower corner of the coil oppo site the water inlet The water in the coil will drain through the intermediate distribution basin This prevents the need to manually drain the coils during tower shut down Unless some means of freeze prevention is incorporated into your system the tower basin and exposed pipework should be drained at the beginning of each wintertime shutdo...

Page 19: ...in significant chlorides or hydrogen sulfide H2S Many proprietary chemicals exist for control of scale corrosion and biologi cal growth and should be used prudently Also combinations of chemicals may cause reactions which reduce treatment effectiveness and certain chemicals such as surfactants biodispersants and antifoams may increase drift rate Unless you purchased a stainless steel NCWD the stru...

Page 20: ...centrations circulating water will contain four times as much dissolved solid as the makeup water assuming none of the solids form scale or are otherwise removed from the system 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 ...

Page 21: ... Replace worn or damaged components To minimize the presence of waterborne microorganisms including Legio nella follow the water management plan for your facility perform regularly scheduled cooling tower inspections and maintenance and enlist the services of water treatment professionals For additional technical support contact your Marley sales represen tative For help identifying the sales repr...

Page 22: ... ASHRAE Standard 188 and Guideline 12 for specific frequency recommendations Consult a knowledgeable water treatment professional to maintain cooling tower hygiene 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 down the to...

Page 23: ...only oil designed specifically for these Geareducers If after five years turbine type mineral oil is used the oil must be changed semiannually Refer to the Geareducer Manual for oil recommenda tions 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 ...

Page 24: ...Replace fill plugs and operate mechanical equipment 30 minutes to one hour to purge excess grease at grease relief opening 5 Reinstall grease relief plugs and reinstall guard 6 Resume normal tower operation 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 drai...

Page 25: ...prescribed in the Fan User Manual Fans shaft bearings If equipped lubricate fan shaft bearings at close of each operating season Fan motors Clean and lubricate motor if required at close of each operating season refer to motor manufacturer s recommendations Does not apply to motorswithsealedbearings Checkmotoranchorboltsandtightenasrequired See Page 24 for towers with motor located outside the ple...

Page 26: ...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 Periodic maintenance You may wish to contract with SPX for regularly scheduled visits for the purpose of inspecting and ...

Page 27: ...loose driveshaft or coupling fasteners x Check driveshaft or coupling bushings or flex element for unusual wear x x Lube lines if equipped Check for oil leaks in hoses or fittings x R 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 as required R Check mounting bolts for tightness x Operate at least...

Page 28: ...ameplate values Overload Check fan blade pitch See Fan User Manual Check for drag in fan drivetrain as from damaged bearings Wrong motor RPM Check nameplate against power supply Check RPM of motor and gear ratio Bearings over greased Remove grease reliefs Run motor up to speed to purge excessive grease Does not apply to motors with sealed bearings Wrong lubrication in bearings Change to proper lub...

Page 29: ...re causing recirculation of tower discharge air Discuss remedy with Marley representative Design wet bulb temperature was too low May have to increase tower size Discuss remedy with Marley representative Actual process load greater than design May have to increase tower size Discuss remedy with Marley representative Overpumping Reduce water flow over tower to design conditions Tower starved for ai...

Page 30: ...safe installation and operation of the cooling tower Field installation is always required for fan guards piping inlets and piping outlets Some optional accessories such as valves handrails ladders and safety cages may also require field installation If installation details are not covered in the NCWD Field Installation Manual a separate instal lation drawing or manual for each purchased option is...

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Page 32: ...RESERVED In the interest of technological progress all products are subject to design and or material change without notice NCWD cooling tower USER MANUAL SPX COOLING TECHNOLOGIES INC 7401 WEST 129 STREET OVERLAND PARK KS 66213 USA 913 664 7400 spxcooling spx com spxcooling com ...

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