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Pag10

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7. GENERALMAINTENANCEINSTRUCTIONS

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 Duetothequalityoftheseunits,maintenancerequirementsareminimal.Nevertheless,theywillbeinspectedfullyonamonthlybasis.Inthe

sameway,theentirecircuitshouldbecleanedeveryyear.

 Itisadvisabletocarryoutcertainactionsregularlyinordertoensurethatyouachievetheservicelifeandpe

rformancethattheseunitshave

beendesignedfor

 Therearetwobasicareastocover:

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 1. Waterrecirculationsystem

 2. Airblowingsystem

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 7.1 Inthewaterrecirculationsystem

Duetothefactthatthesystem sinwhichtheseproductsarebasedarerelatedtoevaporation,somesaltyconce

ntrations,aswellas

suspendedsolidsareproduced.

Therefore,somesecondarywaterflowhastoberemoved,inordertopreventtheconcentrationsinthecoils.Thedrainageconnection

willbeusedtodothis.

Thewaterconditionswillbecontrolledcontinuouslyandautomatically,bypurgingofdirtywaterandre

placementwithclean,addition

ofbio dispersant agentsand biocides,inhibitorsto preventlimescale frombuildingup orthecorrosionofthemetallicpartsofthe

circuit. Several varieties are commercially available and the most suitable shouldbeselected in consultation with specialised  firms,

whohavethekno

wledgeofthewaterintheinstallationsandthearea.Becarefulifanyaci d productisbeingused,duetothefactthat

isnotrecommendedthePHtobelowerthan6.5.Anotheraspecttotakeintoconsiderationisthefactthattheproductsbeingused

havetobecompat

iblewiththekindofmaterialscomposingthecoolingtowers.

Theseunitswillbedisinfectedtwiceayear,atthebeginningofspringandofautumn,aswellasinthefollowingcircumstances:

• Beforeputtingintooperation.

• Iftheyhavebeenstoppedforalongperiodoftim

e.

• Whenrepairshavebeencarriedout.

• Whenroutineinspectionsoindicates.

• WhentheSanitaryAuthoritiessodetermines.

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Disinfectionwillbecarriedoutusingauthoriseddisinfectants;ifchlorineisused,inject5p.p.m.ofchlorineplusbiodispersantsinto

thebasinandsetthepumpsrunningforfivehours.Thefanswillbestopped.

Following this, all the water will be drained fr

om the circuit and it will be cleaned thoroughly, adding water until  the drain wate r

appearsclean.

Finally,itwillbefilledwithcleanwaterandbetween5and15p.p.m.ofchlorinewillbeadded.Thepump

swillbeallowedtorunfor5

hours,withthefansstopped(checkthechlorineleveleveryhour).

Thewaterconditionswillbecontrolledcontinuouslyandautomatically,bypurgingofdirtywaterandreplacementwithclean,addition

ofbio dispersant agentsand biocides,inhibitorsto preventlim

escale  frombuildingup orthecorrosionofthe metallicpartsofthe

circuit.

Thewaterwillbedrainedoutofthebasinwhentheunitisnotinuse.

Themaintenancefunctionstobecarriedoutforthedifferentelementsarelistedbelow.

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7.1.1 Grid

 Thishastobecl

eanedmonthly,orasfrequentlyasthesedimentpresencerequires.

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7.1.2 Basin

 Thishastobecleanedanddrainedmonthly,orasfrequentlyasthesedimentpresencerequires.

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7.1.3 Watermake‐up

 Floatvalvewillbecheckmonthly,aswellasthewaterlevelinthebasin,italwayshastowo

rkabovethegridandsuctionlevel 

oftheelectricpump.

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7.1.4 Electricpump

 No special maintenance is needed. After around 10,000 working hours, bearings have to be checked, as well as the

mechanicallocking.

 Ifthetowerisbeingstoppedforawhile,theremovalofallwaterinsidethepumpisreco

mmended,bymeansofthedrainage

connectionatthebottom.

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VERYIMPORTANT!!WHENRUNNINGTHEPUMPAFTERBEINGSTOPPED,ALWAYSTAKEINTOCONSIDERATIONTHATTHEPUMPMUST

BECHARGED.

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7.1.5 Waterdistributionsystem

Thishastobecheckedmonthly.Todoso,someeliminatorblockshavetoberemovedinordertoinspecttheinsidepart.The

fanshavetobestoppedandtheelectricpumpwillbeswitchedon.

The nozzles, whic h are wide passage, with minimum possibilities of brea

king down or blocking, allowing  perfect water

distribution(fullcone)overthecoil.Ifbyanychancetheybecomeclogged,theycanbedissembledveryeasily.

  Thiswillmeanthatthegridisnotclean,orthedistributionpipesaredirty.

Therefore,thegridwillbecleaned,thenozzleswillberem

ovedifnecessarytodoso,and thepumpwillbeswitchedon,in

ordertoclean thepipes. If the nozzles have to be removed, when reinstalling intheirplace,becar eful  to put them in the

correctposition,asshowninfig.10.

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