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steel cooling tower

I N STALLATI ON - OPE RATI ON - MAI NTE NAN CE

Z0628276 rev A I S S U E D 05/2015

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

U S E R MAN UAL

Содержание Marley NC Series

Страница 1: ...NC steel cooling tower I N STALLATION OPE RATION MAI NTE NANCE Z0628276 rev A I SSU E D 05 2015 READ AND UNDERSTAND THIS MANUAL PRIOR TO OPERATING OR SERVICING THIS PRODUCT US E R MAN UAL...

Страница 2: ...ng tower Carefully read the manual before installation or operation of the tower and follow all instructions Save this manual for future reference Indicates presence of a hazard which can cause severe...

Страница 3: ...ranty If you have questions about the operation and or maintenance of this cooling tower and you don t find the answers in this manual please contact your Marley sales representative When writing for...

Страница 4: ...ccess platform Tower 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...

Страница 5: ...es per cell The upper module includes 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 All other models s...

Страница 6: ...amsandfromthetopofthebottommoduleandremoveshipping cover from bottom of top module replace fasteners at side of module to preventleaks Placetopmoduleonthetopperipheralbearingsurface factory installedg...

Страница 7: ...ropriately sized circular opening has been provided to accept a 125 ANSI B16 1 flat face flange connection Side outlet sump connection Unless otherwise specified sumps are manufactured of heavy duty F...

Страница 8: ...place of the standard elbows normally required for inlet connection and 2 provide means of regulating flow to both sides of the tower Remove the center inlet flume assembly to gain access for attachm...

Страница 9: ...t cycling the tower will cause fuses breakers or O L s to operate and will decrease motor life When using a two speed starter Motor rotation must be the same at slow speed and high speed Single windin...

Страница 10: ...ied 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...

Страница 11: ...models include a single piece fan guard NC8405 through NC8414 models include a two piece fan guard Models with extended velocity recovery cylinders do not have fan guards Improper installation of the...

Страница 12: ...s will prevent abnormal stress from being applied to the mechanical equipment and the electrical circuit components 5 Run the motor and observe the operation of the mechanical equipment Opera tion sho...

Страница 13: ...that it is 75 open at that level Continue filling the system until the water reaches a level approximately 1 8 below the lip of the overflow If tower is equipped with a standard case face outlet conn...

Страница 14: ...entoperation within these limits 6 Continue pump operation for about 15 minutes after which it is recom mended that the water system be drained flushed and refilled 7 While operating the condensing wa...

Страница 15: ...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...

Страница 16: ...eraturebecomestoo 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 tem...

Страница 17: ...below a mini mum allowable level say 36 F to 40 F If such low temperature operation is necessary or beneficial to your process establish the minimum allowable level as follows During the coldest days...

Страница 18: ...on should not need to exceed 1 or 2 minutes Monitoring is required to determine the time required to melt accumulated ice Operating the fan in reverse at half speed for prolonged periods during subfre...

Страница 19: ...ange of the internal riser and tap for a 20 bolt with sealing washer that will be used as a plug See figures below for drilling details Normally weep holes are plugged during tower operation and plugs...

Страница 20: ...least the first eight weeks of operation pH should be controlled between 6 5 and 8 0 with hardness and alkalinity levels between 100 and 300 ppm expressed as CaCO3 Chlorine if used shall be added inte...

Страница 21: ...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 devic...

Страница 22: ...that secure the motor mount frame to the belt drive frame then loosen the retaining nuts on the two threaded rods and turn the threaded rods to apply proper tension Apply the same quantity of turns to...

Страница 23: ...f each other and level within 1 2 1 8 in 12 in order to not adversely affect belt and sheave life Alignment can be achieved by placing a straight edge across the sheaves making sure that it is level a...

Страница 24: ...s recommended that you read them thoroughly Where discrepancies may exist the separate Service Manuals will take precedence The following is recommended as a minimum routine of scheduled mainte nance...

Страница 25: ...pment by hand grease the bearings until a bead forms around the seals Mobil SHC 460 grease is recommended Semi Annually If equipped check the belt tension and condition If equipped check Geareducer oi...

Страница 26: ...ctions Motor located outside plenum option Open and lock out disconnect switch to make certain motor cannot be started 1 Remove guard as shown Opposite end motor bearing is accessible from outside the...

Страница 27: ...s a need to have the tower painted If relatively bright metal can be exposed by cleaning consider that the galvanizing has remained effective Unless there is evidence of a generalized failure of the g...

Страница 28: ...eds and maintain consistently optimum thermal performance capability They are available by contacting your Marley sales representative Replacementparts Acompletestockofpartsandcomponentsismaintained a...

Страница 29: ...es if equipped Check for oil leaks in hoses or fittings x R x Belt drive if equipped Fan shaft bearing lubrication every 3 mo every 3 months every 3 months Check and tighten support fasteners x Check...

Страница 30: ...anced voltage Check voltage and current of all three lines against nameplate values Overload Check fan blade pitch See Fan User Manual Check for drag in fan drivetrain as from damaged bearings Wrong m...

Страница 31: ...foreign substance in circulating water system Insufficient blowown See Water Treatment section of this manual Water treatment deficiency Consult compentent water treating specialist See Water Treatmen...

Страница 32: ...safety cages may also require field installation If installation details are not covered in the NC Field Installation Manual a separate installation drawing or manual for each purchased option is inc...

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