serie TMA (inglese)
Contents
1. SHIPPING TMA series cooling towers are normally shipped divided horizontally in two sections the upper section includes the fan section the drift eliminators the water distribution system and the wet deck fill whilst the lower section includes the water collecting basin with the related connections The reassembly operations at the site shall be carried out at the Purchaser s care and expense following our instructions provided Any accessory equipment such as marine style access ladders railings etc shall be always shipped disassembled and also their reassembly at the site shall be carried out at the Purchaser s care and expense Completely assembled shipment of these towers must be especially requested when placing the order The towers divided in two sections are delivered along with a sufficient special gasket and the nuts and bolts necessary for the reassembly this kit is placed inside the inspection door and there is a label to indicate this2. ENERALE ALIMENTAZIONE A LINEA A A ENTILATORE ESISTENZA Avviar tella triar In nr tor e T F In A F In A In A PRA A In A In e le Ll AAA Ne Ll A pziond In A Le LEGE A TELE E_RISCALDATORE RISCALDATORE AW TELE E TRIA VENTILATORE Mie TELE E E F FUSIBILI AZ TELE E TELLA LIMITE DI F ITURA KEY BA1 COMMON REMOTE CONTROL SWITCH BA2 REMOTE CONTROL SWITCH FOR STAR BA3 REMOTE CONTROL SWITCH FOR DELTA 47 Two speed Dahlander motor ENERALE ALIMENTAZIONE A LINEA A A ENTILATORE ESISTENZA In A k k k T In A E In ei o In _ A In BI 7 gt gt e Al BB1 n A L Ll In A In A 2y LEN T e Ll si RS L Opzior Aas I BA A OLEGAMENTO MOTORE BASSA VELDCIT ALTA VELOCITA LEGE A TELERUTTORE RISCALDATORE ALDATORE TELERUTTORE BASSA VELOCITA TORE VENTILATORE A A2 TELERUTTORI ALTA VELOCITA TORE A TELERUTTORE MPA F FUSIBILI LIMITE DI F ITURA KEY BB1 REMOTE CONTRO
3. Upper section Lower section Upon receipt of the goods ensure the presence and integrity of all the components communicating any apparent anomaly to Decsa Srl with suitable notes made directly on the delivery documents 17 LIFTING All series TMA cooling towers are equipped with external lifting ears Fig 3 Whereas the pans sumps of the towers are fitted with lifting ears located on the inside of their uppermost flange It is indispensable that these lifting ears are all always tensioned and that the lifting cables act vertically and avoid breakages or deformations and danger during lifting When moving only the lower water collecting basin section respect scrupulously the scheme paying particular attention to the slings and spacers The lifting ears must in any case be used for small movements or for final positioning whereas for extended lifts such as from ground to the top of a building a suitable robust platform under the unit should be used CAUTION SUSPENDED LOADS A Og A AX 2 V VADY AN X
4. EE EES GROEIEN EDER COCON I NEE EE EECH REN COO EE ro KC E E a TEL LI ON E cs i a LLN OD GO i en TT gg va a e co ai GO a a a cai en Te NTN LIEN LITTELL ELT E EE 1 OG oe EE EE EE EE EE N KE EL EECH I Ror dp el pn th ILTIMCIICELTELII OG a sn PADDR MHRA TK EE a ap A EN KG On ln cy i ll i i e lene Inspection door 3 Fibreglass mate Keser 0 owe e ii ee i PVC Wet deck heat exchange fill i Stainless steel Tapered connection 2 5 7 Deeg 13 LOCATION Consult the related detailed guidelines of Decsa Srl both for the general aspects of correct location of cooling towers and for the aspects specific to the installation to be built TMA cooling towers offer maximum flexibility of outside installation The vertical air discharge ensures that the operation of the tower is not affected by wind strength and direction It is necessary however to keep in mind some basic installation rules which if not observed will impair correct operation of the cooling tower It is important that the air intakes to the cooling tower are not obstructed Exact values for the distances to be respected between tower and full walls are based upon the velocity of the drawn air in the corridor
5. 1 electric motor 2 drive shaft 3 orthogonal gearbox 4 axial fan Insert the key in the 6 positions indicated without rotating the shaft During the initial period of operation foreign matter deposited in the sump may reach the nozzles It is therefore advisable to frequently clean the nozzles during the initial period of operation as irregular or reduced spraying may reduce the efficiency and increase scaling When the water level in the pan sump descends air is drawn in by the pump suction and cavitation is induced Maintaining the correct water level is therefore important The fan system can be started only after the set up and stabilisation of the water circulation and only when the latter is operational List of Tools required series of spanners 1 adjustable spanner series of Allen screwdrivers air compressor equipped with flexible tube for removal of dirt residues and eventually a paint pistol for touch ups Caution do not leave tools inside the tower after a start up or shut down operation A 27 INITIAL AND SEASONAL START UP OPERATION Inspection of the conditions of the unit in general possible cleaning and or touch up of galvanised components Cleaning and washing of inlet grilles pan sump and water filter Adjustment of float valve and water level Inspection of nozzles for absence of deposits or scale Inspection of fill pack
6. 11 Check of the drive system For those units equipped with gearbox drive it is best to verify on a regular basis the alignment the fixing bolts and the good condition of the whole Such a check must be effected every six months Within the scope of this overall check it is appropriate to recheck the correctness of the alignment of the drive shaft making use of the calibrated key supplied for that purpose with the unit see schematic drawing in the chapter on Start up 12 Regular fan operation If the unit is not operating for long periods of time it is necessary to programme regular start up of fan s in order to prevent the excessive drying of bearings and gaskets 13 Check on oil level in the orthogonal gearbox For those models fitted with a mechanical gearbox drive it is recommended to check weekly the oil level via the spy hole fitted for that purpose topping up if necessary If oil losses are apparent or if there is abnormal noise or vibration at the gearbox shut down the cooling tower and search for the causes of the anomaly Special precautionary measures are necessary during periods of inactivity since the internal components are not then protected by the oil as they are during operation and are thus exposed to oxidation and corrosion We suggest that the gearbox should be operated for five minutes once a week in order to distribute the oil over the gear cogs and the other internal components If the gearbox is to remain
7. Make up pressure head must be at maximum of 2 bar Maximum operating pressure at water inlet connection must be 0 8 bar Higher pressure values may seriously damage the water distribution system inside the unit Before tightening the bolts and nuts of the flanged connection check the alignment of the flanges themselves and that they are in parallel planes Itis also advisable to install shut off valves on each tower to enable separate maintenance of each these valves are also useful to even out differences in water flow to each tower Whereas the possibility of this shut off is convenient the possibility of adjustment to balance the flows is very important 21 Sealing of Leakages During transportation and lifting the units can be submitted to stresses that damage the sealing which will result in water leakage during operation To eliminate these leakages it is essential to proceed as follows 1 AR WwW N 5 Sealing must always be made from the inner side of joints Seal only perfectly dried surfaces Remove previous sealants Accurately degrease Do not seal only the area where a leakage is taking place but rather seal an excess length at both ends Apply the sealant with the extruder for that purpose in a sufficient but not excessive quantity and as uniformly as possible If necessary slightly press the sealant to allow the penetration between the surfaces Do not use the unit for at l
8. TMA series Cooling Towers Service Manual no MS 02 11 TMA E Rev 3 INDEX Introduction and general safety information Page 4 Standards and important safety information Page 5 Description of the machine unit Page 9 Location Page 14 Shipment Page 17 Lifting Page 18 Reassembly Page 19 Installation Page 21 Electric wiring Page 24 Start up Page 26 Operation Running Page 30 Maintenance Page 32 Trouble shooting guide Page 36 Spare parts Page 38 Decommissioning dismantling and disposal Page 42 Appendix Characteristics Appendix Il User s or operator s notes Appendix III Electric wiring diagrams for the connection of the fan motors Appendix IV Identification data Thank you very much for purchasing our equipment and be sure to carefully read this manual before using the machine The series TMA cooling towers models 08 55 39 866 comply with the European Community directive no 98 37 CEE INTRODUCTION AND GENERAL SAFETY INFORMATION Care Caution The objective of this manual is to make available to the purchasers to the operators and to the maintenance personnel all the indications necessary for the installation the start up the running the maintenance and the resolution of eventual faults of TMA series cooling towers Please read carefully this manual before using the unit You will find information important for the safe usage of TMA series cooling towers The residual risks and the related precautions are indic
9. As already emphasized in the chapter on Installation it is prohibited to walk on the uppermost surface of the cooling tower if it is not equipped with a walkway for that purpose OPERATION Inspection of the conditions of the unit in general possible touch up of galvanised components 2 Cleaning and Washing of pan sump and filter lt lt gt lt gt lt gt lt lt X x x x First Start up gt x Xx gt Monthly x gt lt gt lt PA pre gt lt gt lt PA fm 3 Adjustment of make up valve and water level Inspection of nozzles nspection of fill pack heat exchange surface nspection of drift eliminators nspection of inlet grilles louvers Check and adjustment of bleed off Check on vibrations and or unusual noise 10 Check voltage and absorbed current 11 Check drive system where applicable X Periodic fan operation and check on their direction 12 X of rotation and unobstructed operation Check of oil level in orthogonal gearbox 13 X X where applicable Change of oil in orthogonal gearbox 14 l X where applicable At the end of every maintenance operation check that all the air discharge screens are in place and that the related fixings have been tightened 6 8 ER 10 11 X List of Tools required series of spanners 1 adjustable spanner series of Allen screwdrivers air compressor equipped with flexible tube for removal of dirt residues and eventuall
10. If necessary remove the nozzles this operation can be accomplished without any tool as the nozzles are in rubber and can be removed by pulling them gently with alternate rotations The reassembly operation can be facilitated by wetting the connecting collar Check on fill pack heat exchange surface As scaling builds up because of improper water treatment and or irregular spraying a frequent check of the fill may save considerable damage to the unit Uniform scaling would mean that water treatment is inefficient whereas localised scaling means that one or more nozzles are not spraying correctly Check on drift eliminators Check the correct positioning and integrity Check on inlet grilles louvers Check the correct positioning and absence of dirt inside Check bleed off water The bleed water pipe is complete with a tap that should be regulated according to the water conditions Based upon experience and regular checks the bleed off tap should be suitably adjusted to avoid scaling and simultaneously save water Check vibrations Any fault with the fan and or electric motor can cause vibrations of the unit If this occurs immediately stop the unit and check the reasons of vibrations Serious damage en unit can thus be spared The water circulating pump should also be checked for vibrations Check voltage and absorbed current of the motors measurements to be made at the control panel and not directly on the motors themselves 33
11. N V AN gt 4 Sd Figure 3 REASSEMBLY RIGGING When re assembling proceed as follows Fig 1 Place the lower section of the unit on a flat surface having first ensured that the upper edge has not been damaged during transportation Clean carefully Cut a suitable length of sealer gasket remove paper protection from one side and press gasket onto base top flange Remove paper on the other side and drill holes in the gasket in correspondence with the connection holes Place the bead sealer over the tape sealer gasket in the area between the holes and the inside of the unit see sectional drawing below Lift in accordance with the instructions of paragraph Lifting the upper section of the unit and place it in position with the help of metal pins inserted into the holes of upper and lower flanges If the holes do not correspond it means that either the lower or the upper section of the unit are not level this may depend upon the support platform or on the way in which the upper section has been hoisted during assembly In some cases if it proves to be difficult to obtain perfectly flat surfaces it may be more convenient to re drill some of the holes In this case be sure to previously remove the gasket from the holes It is necessary
12. TT QC E UE N E NC CT TT TT E E E 4 es EE EXC SECT sjopow VINL LSI SININOJNO9 COMPONENTS LIST TMA models Description U M 19 262S Se 19 316 29 525S 29 600 29 633 39 746 39 780 39 866 Electric motor no 1 1 1 2 2 2 3 3 3 Axial fan diam 2600 mm no 1 1 1 2 2 2 3 3 3 Axial fan diam 2100 mm no shaft n 1 1 1 2 2 2 3 3 3 Drift eliminators L 500 set 1 1 1 1 1 1 1 1 1 Drift eliminators L 1200 set 1 1 1 1 1 1 1 1 1 Secondary Header carrying no nozzles L 2 4 m Secondary Header carrying no 12 12 12 24 24 24 30 30 30 nozzles L 2 9 m Spring collar of nozzle no 60 60 60 120 120 120 150 150 150 Tapered linkage for nozzle no 60 60 60 120 120 120 150 150 150 Nozzle gasket no 60 60 60 120 120 120 150 150 150 Nozzle body no 60 60 60 120 120 120 150 150 150 Nozzle impeller no 60 60 60 120 120 120 150 150 150 Gasket for secondary header no 12 12 12 24 24 24 30 30 30 Decsapack set 1 1 1 1 1 1 1 1 1 Inspection door no 4 4 4 6 6 6 8 8 8 Plastic bolt for inspection door no 16 16 16 24 24 24 32 32 32 Inlet grilles set 1 1 1 1 1 1 1 1 1 Make up float valve no 1 1 1 2 2 2 2 2 2 Water filter in AISI 304 no 1 1 1 2 2 2 3 3 3 41 At the end of every parts change operation check that all the air discharge screens are in place and that the related fixings have been tightened Lis
13. Thermal Air flowrate No of fans and motors Power rating of Capacity m3 s T transmission drive each motor kW kW 08 55 10 36 E 08 58 10 36 pf 14 11 131 11309 12689 oo LU 11 145 1450 12722 145 11 4153 5 SEE 20 191 CT 11910 13556 12 2x75 20 207 CT 12072 13889 l2 2 20 219 CT 12184 13889 a s 21 261 CT 12618 15278 l2 xi 20 276 CT 2762 15444 12 2 15 21 291 CT 12912 15444 2 12x15 31 392 CT 13927 17947 hB sx 31 435 CT 14350 18167 B 13x15 31 458 CT 14586 18167 B o 13x15 14 145S 4 166 EE OG gS The maximum water temperature in the standard towers is 55 C Nominal thermal capacity heat rejected at the following conditions wb 24 C water inlet outlet temp 35 30 C The models whose no is followed by the designation CT are compatible with container shipment but are not necessarily the most economical The models whose no is followed by the designation S are silenced lower noise compared to others of equal capacity but are more costly 43 Characteristics Engineering Data TMA Model Thermal Air flowrate of fans and motors Power rating of Capacity m3 s T transmission drive each motor kW kW The maximum water temperature in the standard towers is 55 C Nominal thermal capacity heat rejected at the following conditions wb 24 C water inlet outlet temp 35 30 C The model
14. electrical risk due to the cooling tower In any case a differential line breaker must be provided for all the electrical equipment of the cooling tower After connecting the motors check for the correct direction of rotation of fans Shut off Device by others to be provided and installed near the cooling tower for the operations of adjustment maintenance and replacement of components According to the EN 60204 1 standard an emergency stop must be such that the rearming of the shut off device with which the tower is equipped does not permit a new start Consequently the eventual use of the said device for emergency stops will require the presence of another switch to be connected in series with the switch of the shut off device itself to the central control panel in such a way that the electric current is shut off also at the central panel when the shut off device is activated RESIDUAL RISKS AND RELATED PRECAUTIONS Do not approach the unit when it is operating Beware of corners and edges Characteristics of the mechanical protection devices The protection devices screens are robust do not introduce further risks are external to the danger zones and do not obstruct the field of vision The installation work does not require the removal of these protective screens but the maintenance operations could require it Such removal does however necessitate the use of suitable tools and in any case the cooling tower should be fitted w
15. it is prohibited to walk on the uppermost surface of the cooling tower if it is not equipped with a walkway for that purpose To access the motors it will therefore be necessary to protect the zone where the operator must pass with planks of wood or with other suitable means If the fan motor is controlled by an inverter VSD with frequency variation particular attention should be paid to its programming in order to avoid the operation at critical speeds In order to avoid unexpected wearing out of the motor it is recommend to not exceed the ceiling of 5 starts per hour g The electric motors from 0 55 kW L80 up to 22 kW L180 are equipped with pre lubricated bearings which do not necessitate any lubrication and their operating life is about 30 000 hours The motors from 30 kW L200 m up to 45 kW L250 are equipped with open bearings requiring lubrication The bearings have an automatic grease discharge device The bearing chambers are to be pre filled with grease to not more than half of their Capacity since an excessive grease quantity makes the bearings run hot It is recommended to refill the bearings with grease every 1500 hours of motor operation or at least once every 6 months Lithium grease must be used for lubrication The refilling of bearings with grease can be made through the greasing nipple fastened in the bearing cover on both sides of the motor Before refilling the grease nipple must be cleaned It is re
16. micro switches The dangers to be avoided by the operators and other exposed persons are twofold access to the fans possibly running and close contact with the flow of humid air entraining droplets of chemically treated water The disadvantage of employing a safety device would be the possible shut down of the fans with the consequent reduction in cooling capacity at some moment when the cooling requirement is highest in the case of mistaken opening or non programmed entry into the unit The hot and humid ambient may favour the growth of micro organisms For specific recommendations consult a specialised water treatment supplier Protection against Biological Risks The recirculating water system of a cooling tower may contain chemicals or biological contaminants which could be harmful if inhaled or ingested Accordingly personnel who may be exposed directly to discharge airstream and associated drift mists generated during operation of the water distribution system and or compressed air should this be used to clean portions or components of the recirculating water system should wear respiratory protection equipment approved for such use by local occupational health and safety authorities Prevention of Biological Risks Location Each cooling tower should be located and positioned to prevent the introduction of discharge air into the ventilation system of the building on which the tower is located and of adjacent buildings Biological co
17. of the quotation and of the related order Respect at all times the maximum temperature for the heat exchange surface 55 C Other temperatures and or applications are not admissible if not previously agreed with the manufacturer in the design and quotation phase Decsa Srl will not accept any responsibility for injury to persons and or damage to other objects due to a non respect of these limitations Protection against Biological Risks The recirculating water system of a cooling tower may contain chemicals or biological contaminants which could be harmful if inhaled or ingested Accordingly personnel who may be exposed directly to discharge airstream and associated drift mists generated during operation of the water distribution system and or compressed air should this be used to clean portions or components of the recirculating water system should wear respiratory protection equipment approved for such use by local occupational health and safety authorities Biological control Blow down with or without chemical treatment for scale and corrosion control is not adequate for control of biological contamination The growth of algae slimes and other micro organisms if unchecked will reduce system efficiency and may contribute to the growth of potentially harmful micro organisms in the recirculating water system Accordingly a biocide treatment programme specifically designed to address biological control should be initiated when the system
18. shut off device Mechanical rotating parts Mechanical rotating parts SS Sa EE Use shut off device Mechanical rotating parts OPERATION RESIDUAL RISKS PRECAUTIONS Inspection of the conditions of the unit in general possible cleaning and or touch up of galvanised components If the cooling season lt 6 months make a running check of fans and verify correct direction of rotation and of unobstructed operation Cleaning and washing of inlet grilles pan sump and water filter and then drainage of pan sump Close the make up valve and drain the associated piping If the cooling season lt 6 months change of oil in the orthogonal gearbox where applicable Use shut off device Use regulation protection and safety equipment follow instructions for usage of zinc spray Visual inspection with fan screens fixed in place Mechanical personal Biological chemical rotating parts Mechanical rotating parts Use personal and equipment Use personal and equipment Use shut off device regulation protection safety Biological chemical treatment and from possibly water regulation protection safety Biological chemical treatment and from possibly water Mechanical rotating parts 29 OPERATION RUNNING PERMITTED USES the cooling tower is foreseen exclusively for the cooling of water as per the description of the unit and in accordance with the selection data
19. water level should not be too low as this should enable air to be drawn into the pump which would cause rapid wear of the impeller Moreover the insufficient water sprayed over the fill would cause reduced efficiency and rapid scaling This defect becomes apparent from an intermittent noise of water discharge from the spray nozzles during tower operation This phenomenon is on the other hand quite normal at the initial start up of the cooling tower up until the complete purging of air from the piping The fine adjustment of the float ball is made by loosening the nut which fixes the float ball to the lever arm and moving the float ball vertically In some models it is also possible to adjust the angle of the lever arm with an appropriate nut Whereas movement of the float ball away from the float valve along the lever arm further contrasts the make up water pressure check that the fans are free to rotate and in the right direction Inthe case of anomalous vibrations of moving parts shut off immediately the unit and contact our Engineering Dept refer also to the Trouble Shooting Faults Guide 26 If the drive system is of a mechanical type with orthogonal gearbox the correctness of the alignment of the drive shaft must be checked after about 12 hours of operation using the calibrated key supplied for that purpose together with the unit see the schematic drawing shown below
20. ART UP Fan control by others must be such that the fan motor is activated only after start up of the cooling water pump Before initial start up verify the alignment of all the section of the unit and the correct emplacement of the various components Check that all the air discharge screens are in place and that the related fixings are tightened Ensure that all the installation work adjustments and connections have been completed Protection against Biological Risks The recirculating water system of a cooling tower may contain chemicals or biological contaminants which could be harmful if inhaled or ingested Accordingly personnel who may be exposed directly to discharge airstream and associated drift mists generated during operation of the water distribution system and or compressed air should this be used to clean portions or components of the recirculating water system should wear respiratory protection equipment approved for such use by local occupational health and safety authorities Each TMA unit is tested at the factory before shipment however the following items should be checked prior to initial start up if the float valve has been secured for shipment free it The float valve on the make up water connection is adjusted at the factory but it may be necessary to check for proper operation The float valve should be completely closed when the level in sump is approximately 20 mm below the overflow connection Conversely the
21. L SWITCH FOR LOW SPEED BA1 BA2 REMOTE CONTROL SWITCHS FOR HIGH SPEED 48 Appendix IV IDENTIFIGATION DATA The TMA series units have a name plate which indicates the model no and the serial no For any information whatsoever or for a spare part one must make reference to these indications Example Decsa srl 27058 Voghera Italy Via Cappelletta 1 Tel 39 0383 69411 Fax 62244 www decsa it e mail info decsa it Model Mod le XXX Mass Kg Masse Kg XXXXX Modell Modello TARAN Gewicht Kg Massa Kg EK Order Commande Type of section Type de section 3 X Bestellung Ordine NEE Typ des Abschnitts Tipo di sezione 49 DECSA SRL Via Cappelletta 1 27058 Voghera PV Italy Tel 39 0383 69411 Fax 39 0383 62244 E mail info decsa it WWW decsa it 50
22. THER RESIDUAL RISKS Only for the larger and higher capacity TMA cooling powers close to the motor fan set Danger for the sense of hearing take into account the sound pressure levels in the design phase Only for the eventual scale removal washing with inhibited sulphamic acid from the heat exchange surface possible danger due to the presence of corrosive fluids DESCRIPTION OF THE UNIT TMA series cooling towers are machines of relatively simple design and operation their purpose is the cooling of water by means of the evaporative principle that is rejecting heat by evaporating a small percentage of the water itself The main components of the unit are essentially the water sump inlet air grills evaporative wet deck fill fill headers and nozzles for spraying water drift eliminators axial fans complete with electric motors casing The water is supplied to the tower by connecting it to a system with circulating pumps connected to the users From the inlet header the water is distributed through a spraying system to the upper part of the fill through which it flows to the sump At the same time the air induced by fans is drawn upwards in counter current through the fill the air stream boosts the evaporating process rejecting the heat from water From the sump the water is pumped in a closed circuit back to the user items being cooled The quantity of water evaporating varies as a function of the actual heat load on the cool
23. alve sump entrains air Raise the float ball cavitation 37 88 YOE ISIV Ul Jeu JOTEM enjen Yeo dn eye sejub zou 7 sj ou Jejjedu 8 ZZON ou 9 ZZOU 10 obeyuIj posode ou ejzz0u JO 6 og ou 202 802 VOE 9 ZZON salzzou BuiA Leo JopeeH CAT sferra EE EE ree Eee ee siojeujwe Uu WW 0081 wep ue ww 009 Wep ue ey ww OGZ Wep ue Jerky sjopow VINL LS SIN3NOdNOD SluVd Sauvds 6E boe ISIV Ul 13414 191EM garen eoj dn ayey seu yu Joop uondadsu 10 og onseId ejzzou io aBeyul 001008 e zzou JO Je 09 Buuds 006 Oz VOZ AIZZON w 6 g 7 sejzzou BujAuxeo JopeeH w p g 71 selzzou Buikureo 20091 w Uz 0 220 99 Buihueo JopeeH w g 7 2200 59 Bujkiieo JopesH siojeujwle HUT ww 0081 wep ue ww 0091 wep ue EIXY ww OGZ Wep UEL S OPOWI VIAL LSI SININOJNO9 OV 70 ISIV Ul 9414 1012 M prp ry FP FJ fe EE VC ES E CU EST UT N NT A KC on si el el el al al a al EEE CE CC BEC E O O SO e rar pe O a CS al a a OK ECT sl wl wl ol ool KE ale BC CN N N ME MC MC REC REC INC SRE ejzz0u 10 eBeyui pexede mf mf mf ml ml ml ml ml ms RO a el ol ol al ol sl of al od ooo weenie a OE EE EE EE EE NE BE RESET EC EE EE ooo ooo EE O UE E SSE GA UU N E E E O O RC RC E E
24. ated in each chapter of instructions To minimize the risks it is essential that these instructions are carried out by technically competent personnel to ensure safe and reliable installation and running of the equipment Moreover it is important that the contractor the maintenance technician and the user assure themselves that all the personnel assigned to or responsible for the installation the operation and or the maintenance of the TMA cooling tower have received training based also on this manual with particular reference to chapters 2 and 3 and to those relevant to their job and or to their work on the equipment and that this occurs prior to the start up of the cooling tower The instructions in the manual must be scrupulously respected and followed Many accidents are due to an incorrect usage of the equipment In the event of any difficulty in interpreting these instructions it is essential to consult Decsa for help and advice The plant must NOT be put into operation prior to having clarified all possible doubts STANDARDS AND IMPORTANT SAFETY INFORMATION The reference standards for the design and the construction of these units and for the related instructions for the user are as follows EN 418 EN 292 1 EN 292 2 EN 294 EN 953 for the design of the protective screens EN 60204 1 EN 60335 1 EN 60439 1 ISO 7000 for symbols of danger forbidden actions usage info ISO 3874 for lifting EN 563 For the install
25. ation the adjustment the maintenance and the eventual demolition of the unit safety at work procedures in accordance with the following directives must be respected 89 391 CEE 89 394 CEE 89 654 CEE 89 655 CEE 89 686 CEE 89 695 CEE and eventual subsequent modifications In general terms it should be remembered that the personnel assigned to the works must employ the usual personal protection equipment and overalls always avoiding the use of loose clothing jewellery and covering long hair PERMITTED USES the cooling tower is foreseen exclusively for the cooling of water as per the description of the unit and in accordance with the selection data of the quotation and of the related order Respect at all times the maximum temperature for the heat exchange surface 55 C Other temperatures and or applications are not admissible if not previously agreed with the manufacturer in the design and quotation phase Decsa Srl will not accept any responsibility for injury to persons and or damage to other objects due to a non respect of these limitations The unit must be earthed For protection during a thunder storm or when the unit is left unattended and unused for a long time turn off the power supply to the unit This will prevent damage to the unit due to lightning or power line surges Provided that the cooling tower is connected up with standard compliant components installed in accordance with the standards there will be no further
26. atment companies are perfectly aware of the problems connected with evaporative cooling equipment and will suggest the most suitable treatment programme Please note that the warranty for TMA units is valid only for operation with water of very good quality The recommended parameters for the circulating cooling water are as follows 30 solids lt 50 ppm 7 9 5 in any case the pH is related to the equipment present in the system Conductivity max 6000 uS cm Total hardness gt 2000 ppm 080603 if the total alkalinity tends to zero otherwise in relation to the total alkalinity Calcium hardness related to the chemical treatment applied In any case gt 1500 ppm CaCo3 if the total alkalinity tends to zero Total alkalinity related to the chemical treatment applied In any case lt 1000 ppm CaCo3 Chlorides gt 1500 ppm CL If in presence ofi AISI 304 gt 300 ppm Cl lon gt 3 ppm Fe In case of excessive or strange noise and or vibration refer to the trouble shooting and faults guide Several towers in parallel if the plant includes more than one tower operating in parallel in the same circuit the pans basin must be connected with equalizing lines with related valve to avoid differences in water level and water loss see the chapter concerning installation Antifreeze protection in the absence of a remote sump or of electric pan heaters drain the pan sump and the related piping at the end of the cooling s
27. autions against effects from wind action the base frame should be anchored by means of bolts and steel wires should be connected to the upper lifting ears Generally speaking the indications given above must also be taken into account when installing a TMA tower less sump basin above a concrete sump As far as water connections are concerned given their dependence mainly on the particular installation general rules cannot apply We suggest do however suggest the following Caution While welding the flanges to water inlet and outlet connections care must be taken not to damage surface finish of the paintwork and panel sealing wet deck fill and nozzles For this purpose wet rags should be inserted at the base of the connections The piping must be supported independently of the cooling tower and not impose any load upon it The tower must be placed on the highest point of the water circuit to avoid emptying the system when the pump is stopped If this is not possible a check valve on the water outlet and an air relief valve must be fitted Water circulating pumps must always be placed at a lower level than that of the water level in the tower Water pipes must be properly sized and installed so that normal expansion and contraction is possible In installations with two or more towers care must be taken to balance pressure drops in the various pipe branches and level equalisation pipes must be connected to sumps
28. commended to completely change the grease in the bearings of motors with speed 1500 rpm 50 Hz upto 1800 rom 60 Hz after 10 000 working hours but not later than after 2 years Precautions for particularly lengthy installation and or periods of storage If the unit is to remain inactive for long periods or if site work becomes drawn out it is wise to take the following precautions 25 the electric motors are designed and built to work in a humid air flow however these components are not perfectly water tight some manufactures in fact adopt condensate drain holes to permit the motor to expel whilst running the residual humidity inside the stator Such refinements are designed to serve their purpose during the normal usage of the motor and in the particular case of long shut downs these holes can be the cause of water infiltration and give rise to blockage of the rotating parts The bearings at the two ends of the rotor are of a self lubricating type and as described for the condensate drain holes serve their purpose correctly during normal motor usage a long period of inactivity can give rise to wear of these elements for lack of lubrication To avoid running into the above listed problems a regular periodic operation of the motors must be programmed if that were not possible it is recommend to remove the electric motor and any gearbox and to store it in a dry area not subject to sudden variations in temperature ST
29. eason and keep everything dry until the next period of employment When operation with a VSD with frequency variation is required check that the rotation speed of the motor fan set is included in the design limiting values in case of doubt these values can be provided by our engineering dept Do not ever start up a unit piloted by frequency variation without knowledge of the maximum admissible speed of fan rotation otherwise the fans risk damage and without having checked the resonance speed and ensured that it will be avoided A correct air flow is important for the proper operation of the cooling tower see the chapter concerning location Check systematically that all the air discharge screens are in place and that the related fixings have been tightened 31 MAINTENANCE Although cooling towers are relatively simple machines they are usually subject to very adverse operating conditions The need for maintenance of the TMA series cooling towers are very limited but inevitably to extend good performance of the tower over the years some maintenance service operations must be effected regularly Listed below are to be found the main maintenance operations that must be regularly effected Please note that the indicated frequency may have substantial variations depending on the actual operating conditions of a given unit RESIDUAL RISKS AND RELATED PRECAUTIONS AS PER THE TABLES OF INSTRUCTIONS IN THE CHAPTER ON START UP Caution
30. east 24 hours If the sump has been sealed it is advisable to protect the unit with plastic sheets to avoid rain reaching the recently sealed area Naturally only suitable and good quality sealant must be used single component non acetic silicon Our Engineering Department will be glad to provide you with any further advice you may need 22 Electric wiring Electric wiring diagram The electric wiring is an operation which should be performed by particularly qualified personnel even better if they are specialists Check the integrity along the whole length of the cable to be used for the connection and then proceed with wiring up as per the wiring diagrams The minimum cross section of the connecting cables should be chosen on the basis of the voltage the installed power and the distance between the power source and the user point as per the following table Motor power Cable cross P KW section S mm 0 09 1 5 0 12 1 5 0 18 1 5 0 25 1 5 0 37 1 5 0 55 1 5 0 75 1 5 0 9 1 5 1 1 1 5 1 5 1 5 1 8 1 5 2 2 1 5 3 2 5 4 2 5 5 5 4 7 5 4 9 6 11 6 15 10 18 5 10 22 16 30 25 37 25 45 35 55 35 Check that the primary electricity line to which the unit is to be connected has the same voltage and frequency as that foreseen for the operation of the unit Effect state of the art wiring All live componen
31. f the unit CAUTION DANGER OF ELECTROCUTION do not manipulate electrically live items without having previously disconnected the unit from the mains electricity supply Work on the electrical installation should only be performed by very expert personnel qualified in such matters IT IS FORBIDDEN TO CLEAN LUBRICATE or WORK ON THE UNIT DURING ITS OPERATION It is forbidden to perform lubrication or cleaning works with the unit in operation CAUTION IT IS FORMALLY FORBIDDEN TO WORK ON OR PERFORM WORKS OF ANY KIND NEAR TO THE COOLING TOWER WHEN IT IS IN OPERATION FURTHER APPLICATION NOTES Cut out devices linked to vibration vibro switch type can be supplied on request for critical situations and would be for connection to the electrical control panel Alarm devices are NOT envisaged Information systems are NOT envisaged The health and safety of exposed persons could be put at risk by the malfunction of a unit that operates unsupervised only if for example a cooling tower were to no longer cool a process which as a consequence would become dangerous of the thermal runaway type Such a usage of the cooling tower represents a danger linked to the plant itself and it is advisable to fit such a user circuit with an audible or visible alarm device Motors and other electrical accessories for use in explosive atmospheres are available on request The standard electrical equipment is not explosion proof FUR
32. h IP55 protection This high protection grade is the best guarantee of good and long lasting operation in the humid environment in which the motors are normally installed However it is important that while connecting the motor particular care is given to the tight fastening of the cable entries of the terminal box and to the fastening of the cover of the same terminal box A bad fastening of the cable entry and or of the cover of the terminal box would make the motor subject to water infiltration which would seriously damage the bearings and the windings 24 Even if the following are only general rules of good technical practice we wish to remind whoever installs the wiring that after having wired up the motor it is important to check that 1 the wiring is in accordance with the electric characteristics with which the motor should operate and that the direction of rotation is correct 2 the cable entry is perfectly tightened preventing any water infiltration 3 in case the connecting box has a number of holes for wires the ones that are not used should be tightly closed with an hermetic plug 4 while reassembling the cover of the terminal box the gasket should be correctly placed so as to ensure perfect impermeability Do not operate the unit if the above conditions are not attained f All electrical connections must be effected according to current local regulations Caution To effect electric wiring or other works
33. heat exchange surface for absence of deposits or scale Check on and adjustment of bleed off water Check for unusual vibration and or noise Verification of voltage and absorbed current Check drive system applicable where Mechanical rotating parts Check tightness motor fixing bolts and Ta screen fixings Periodic running check of fans and verification of correct direction of rotation and of unobstructed operation Check oil level of orthogonal gearbox where applicable 10 RESIDUAL RISKS PRECAUTIONS Use shut off device Use regulation personal protection and safety equipment follow instructions for usage of zinc spray Use regulation personal protection and safety equipment Use personal and equipment Use personal and equipment Use shut off device Use regulation personal protection and safety equipment Use personal and equipment Do not access the zone of rotating machinery without having first activated the shut off device Effect measurements at the control panel and not at the motor Flen shut off device Mechanical Biological chemical rotating parts Biological chemical treatment and from possibly water regulation protection safety Biological chemical treatment and from possibly water Biological chemical treatment Mechanical raising the drift eliminators and from possibly water regulation protection safety Biological che
34. id freezing If the unit is shut down during the winter season it is advisable to protect it with a water tight covering 35 TROUBLE SHOOTING AND FAULT GUIDE FAULT CAUSE REMEDY The fans do not operate No electric power to the motor Repair the electrical The motor is blocked connections The fan is blocked Free the motor The mechanical drive system Free the fan s where applicable is not Verify and complete the completely connected up connection of the drive system where applicable The fans vibrate Unbalanced fan impeller s Balance the impeller s Loosened keying Tighten the keying on the shaft The fans operate but draw Backward rotation Interchange the electrical insufficient air connections so as_ to obtain the correct direction of rotation Clanging metallic noise One or more impeller s is are Repair the casing or the of fans striking against the casing impeller s Loosened keying Foreign bodies or tools in the Tighten the keying transmission or fans Remove objects or tools The motor is noisy Damaged ball bearings If the Repair or replace the noise is magnetic faulty motor motor One phase is missing Check the connection Other noise and or Unbalanced fan impeller s Check and balance vibrations Worn belts impeller s Foreign bodies dirt or scale in Replace belts the water distribution system Inspection and clean the water distribution system spray items nome irregularl
35. inactive for long periods it is recommended to fill it completely with oil through the air vent located in the upper part readjusting the level before the restart of operation 14 Change of oil in the orthogonal gearbox Use only oil for gearboxes and gear cogwheels with oxidation inhibitor compliant with AGMA American Gear Manufacturers Association standard no 250 04 The AGMA no and the viscosity are indicated below For start up temperatures below 7 C an oil heater is necessary this can be supplied with the gearbox or added later LUBRICANT AGMA No 5 Viscosity cSt at 40 198 242 Quantity 4 The following indications are simply examples Esso Terrestic 220 Gulf Harmony 220 Mobil DTE Oil BB Shell Turbo 220 Texaco Regal 220 R amp O The original oil must be replaced after four weeks of operation 34 It is recommended to drain the existing oil when it is at the operating temperature and to refill the gearbox with oil of the type and in the quantity indicated Normally speaking the oil should be replaced after 2500 hours of operation or every six months whichever is sooner For operation under particularly harsh conditions increase the frequency of the oil changes The horizontal and vertical shafts are fitted with greased holding seals which do not require further greasing 15 Draining of pan sump Units with seasonal operation should be drained at the end of the cooling season to avo
36. ing tower at a given moment Moreover it diminishes when the outside ambient temperature decreases in the winter low season since the effect of the sensible heat exchange between the hot water to be cooled and the induced draught of air becomes significant The temperature of the water leaving the cooling tower is determined by the design wet bulb temperature of the intake air its value will in any case fora reasonable selection be 3 4 C above the summer design wet bulb temperature TMA units are selected and quoted on a job to job basis for each project and are normally foreseen for usage at the summer operating conditions shown in the quotation It should be remembered that when designing a cooling plant to include a TMA evaporative cooling tower it is necessary to consider several important aspects Layout Location Piping Antifreeze protection Water treatment Sound level limitations with respect also to capacity control i e the type and or the control of the fan motors The characteristics of the TMA models are listed in an appropriate table in appendix REFERENCE TABLE DIRECT DRIVE MODELS E 1 Drift eliminator 2 PVC EC Secondary Reader 00 Fokponiere Wet deck heat exchange fill PVC C CC EPDM Tine 0 1 2 3 4 5 6 7 MV kg AN
37. is first filled with water and administered on a regular basis thereafter in accordance with supplier s instructions For specific recommendations consult a competent water treatment supplier Note It is recommended that operators and maintenance technicians refer also to the Eurovent guide 9 5 2 Ed 2002 for the prevention of biological contamination in evaporative cooling systems When the water level in the pan sump descends air is drawn in by the pump suction and cavitation is induced Maintaining the correct water level is therefore important The fan system can be started only when the water circulation is operational It is important that attention is given to quality of water to avoid build up of scale which reduces the heat exchange and consequently the thermal efficiency of the equipment As water is sprayed over the fill a portion of it evaporates thus increasing the concentration of salts in the remaining circulating water A bleed off connection is supplied with each unit this allows an increase in the quantity of fresh water coming into the sump thus diluting the salts and reducing the scaling effect of water The bleed off tube is complete with a tap that should be adjusted according to the hardness of the water As the quality of water is extremely important for the operation of an evaporative cooling unit we strongly recommend to contact a specialised company to request a suitable water treatment Reputable water tre
38. ith a shut off device by others to be employed at the time of such operations The protective mesh screens on the air discharge are well anchored in position and held by nuts and bolts hence requiring tools 2 spanners for their removal CAUTION owing to the wedge in system of the angled screens at the top of the cooling tower these remain in place even without their fixings whereas the flat screens do not remain in place by themselves The presence of the related nuts and bolts must be ensured after every operation or work intervention Further Mechanical Protection Devices In the case of installation of the cooling tower in an area accessible to exposed persons the end user must provide a standards compliant enclosure since the area around the cooling tower is to be considered a potential danger zone and without an enclosure third party outsiders could possibly remove a protective screen equipping the tower creating in consequence greater risks for other exposed persons and or domestic animals Access to the upper area of the cooling tower Employ a suitable standards compliant ladder In the case of more prolonged and complex intervention on the motor fan sets the use of a state of the art scaffolding compliant to current safety standards is recommended The tower is equipped with access doors to the droplet eliminators inside After installation of the unit one could eventually fit by others the access doors with safety
39. mical treatment and from possibly water regulation protection safety Biological chemical treatment and from possibly water Mechanical rotating parts Mechanical rotating parts Mechanical Mechanical rotating parts parts Use lends off device Mechanical rotating parts Visual inspection with fan screens fixed in place Mechanical rotating parts ee 28 Mechanical rotating parts 29 AFTER 24 HOURS of operation with normal heat load E OPERATION RESIDUAL RISKS PRECAUTIONS Check water level in the Inspection of nozzles for absence of deposits liberated by the flow of water Inspection of fill pack heat exchange surface for absence of deposits freed by the water Check for unusual vibration and or noise Recheck of mechanical drive system where applicable Recheck tightness of motor fixing bolts and fan screen fixings SEASONAL SHUT DOWN Use regulation personal protection equipment Use shut off device regulation protection safety and from Biological chemical treatment possibly water ang safety Biological and possibly chemical Use from water treatment personal Mechanical raising the drift and eliminators equipment J Use regulation possibly personal protection water and safety equipment Biological chemical treatment and from Do not access the zone of rotating machinery without first having activated the
40. ntrol Blow down with or without chemical treatment for scale and corrosion control is not adequate for control of biological contamination The growth of algae slimes and other micro organisms if unchecked will reduce system efficiency and may contribute to the growth of potentially harmful micro organisms in the recirculating water system Accordingly a biocide treatment programme specifically designed to address biological control should be initiated when the system is first filled with water and administered on a regular basis thereafter in accordance with supplier s instructions For specific recommendations consult a competent water treatment supplier Note It is recommended that operators and maintenance technicians refer also to the Eurovent guide 9 5 2 Ed 2002 for the prevention of biological contamination in evaporative cooling systems Dangers of mechanical origin Never place hands or introduce foreign bodies in the air inlet and outlet of the unit Never open inspection doors when the unit is in operation rotating machinery Maintenance operations should never be performed when the unit is in operation Be sure that the unit has been disconnected before entering the dangerous area or inside the unit itself rotating machinery inside Warning signs and indications about the residual risks present on the unit CAUTION DANGEROUS EQUIPMENT read carefully this manual of instructions for use before performing any operation o
41. ontrol circuit should not exceed 250V s If the motor of the cooling tower is remotely controlled by a centralised control panel it is advisable to install an isolating switch in the immediate vicinity of the tower for the complete safety of any maintenance operation C For winter operation it is advisable to install electric heaters with incorporated safety thermostat in the tower sump in order to be sure that all the water contained in the sump cannot freeze Electric wiring separate from that of the fan motor is necessary The sump heater must be controlled by an independent thermostat not included in our supply follow up linked to the pump remote control switch and adequately protected against short circuiting The bulb of the heater thermostat must be placed in the water sump as far as possible from the electric heaters and near the sump bottom When operation with a VSD with frequency variation is required check that the rotation speed of the motor fan set is included in the design limiting values in case of doubt these values can be provided by our engineering dept Do not ever start up a unit piloted by frequency variation without knowledge of the maximum admissible speed of fan rotation otherwise the fans risk damage and without having checked the resonance speed and ensured that it will be avoided Wiring of the motors The electric motors installed on our evaporative cooling equipment normally have class F insulation wit
42. s created between them this matter is covered in detail in our layout guidelines Avoid air recirculation In choosing the site of installation it is important that this aspect is duly taken account of The warm saturated air discharged from the cooling tower must be able to freely disperse into the surrounding atmosphere if a part of this saturated air is recirculated back through the tower the latter s efficiency is compromised A cooling tower should thus not be installed close to walls or obstacles higher than the tower itself which impede the easy dispersion of the discharged air to the surroundings Do not obstruct the air intake and discharge The air is the means by which the heat of the water is rejected to the surrounding atmosphere Good air circulation is thus fundamental to obtain the best results from your cooling tower Ensure therefore that all the air intakes are free of obstacles and that the air can be freely discharged in the correct manner Protective roofing is not admissible 14 Multiple TMA cooling towers in a row When installing several TMA cooling towers in a row or as a group one must ensure that the operation of each single tower does not affect the operation of the others for the minimum layout distances to be respected please contact our engineering dept When installing three or more towers particular care should be taken to avoid the danger of air recirculation above all for the towers in
43. s whose no is followed by the designation CT are compatible with container shipment but are not necessarily the most economical The models whose no is followed by the designation S are silenced lower noise compared to others of equal capacity but are more costly 44 Appendix Il User s or operator s notes 45 Appendix III Electric Wiring Diagrams for the connection of the fan motors Motor with direct on line start 1 SUPPLY LINE IN 2 MAIN CONTROL PANEL 3 SUPPLY PANEL 4 FAN 6 HEATER RESISTANCE ENERALE ALIMENTAZIONE LINEA QUA A ENTILATORE ESISTENZA Avviament lirett In A tandard nnectior T In A In A FO In A In A BI 7 gt BI BESSE A 4 pzional LEGE TELERUTTORE RISCALDATORE ISCALDATORE TELERUTTORE VENTILATORE TORE VENTILATORE TELERUTTORE IPA F FUSIBILI LIMITE DI F ITURA ELEMENTS KEY BR REMOTE CONTROL SWITCH FOR HEATER R HEATER MV FANMOTOIR F FUSES BB REMOTE CONTROL SWITCH FOR FAN BP REMOTE CONTROL SWITCH FOR PUMP 46 PETE LIMIT OF SUPPLY Motor with star delta start
44. t of Tools required series of spanners 1 adjustable spanner series of Allen screwdrivers air compressor equipped with flexible tube for removal of dirt residues and eventually a paint pistol for touch ups Caution do not leave tools inside the tower after a parts replacement operation A DECOMMISSIONING DISMANTLING AND DISPOSAL If the unit whether it be for wear irreparable damage or other reasons must be decommissioned and dismantled it will be advisable to separate the non metal parts such as rubber plastic etc before sending it for disposal scrapping The non metal parts are mainly the heat exchange fill in PVC the water distribution headers water nozzles and the float ball of the water make up valve Protection against Biological Risks All those components which have been in contact with the recirculating water of the cooling tower i e fill pack drift eliminators water distribution system and the spray nozzles may still contain chemicals or biological contaminants at the time of disposal hence the exposed personnel should wear respiratory protection equipment approved for such use by local occupational health and safety authorities Electric motors of fans have the winding in copper wire for which a separate disposal is recommended All electrical components and accessories are in any case special waste and must be disposed of as such 42 Appendix I Characteristics Engineering Data TMA Model
45. the central position TMA Cooling towers without basin sump When installing one or more cooling tower Supplied less basin sump above a concrete sump apart from the aspects previously described verify that the cross section available for airflow is sufficiently large Free area to be respected Taking account of all the aspects previously cited it will be necessary to leave enough space around the tower for maintenance operations in particular maximum accessibility is needed at the side where the main water connections are located at the inspection manholes doors for access to and maintenance of the inside of the unit and at the side where the pan connections are located It can be observed that the rules and suggestions presented here are of a general nature Given the great variety of practical cases it is difficult to provide definite indications but our layout guidelines do provide more specific indications for various types of tower location our engineering dept can be contacted to obtain any further information necessary The dimension B is to be found in the TMA series technical catalogue 15
46. to perfectly centre all the holes before lowering the upper section Fig 2 Push bolts into place and tighten If the unit has been supplied divided into two sections for ease of transport connect the plastic bleed off pipe to the pipe connector fitted above the over flow connection gt gt lt lt y A gt N Inside of unit Outer side of unit 7 SI DID A 19 Sezione bacino Basin section Figure 2 usi IRS 0 S V 1 Guide pin 2 Bead sealer gasket 3 Flat tape sealer gasket Use 2 pins in each corner 20 INSTALLATION Over and above the indications provided in the chapter on Location it is necessary to ensure beforehand that the supporting surface on which the tower is installed will be able to bear its operating weight therefore with water in the tower as indicated in the TMA catalogue TMA series cooling towers do not normally require additional support structures TMA cooling towers must rest uniformly on a perfectly level and horizontal base If the cooling tower must for some reason be installed on metal profiles with or without the interposition of vibration isolators apart from the lateral beams one or two central support beams must also be provided As cooling towers are normally placed in the open air and often on top of buildings it is necessary to take prec
47. ts must be earthed All connecting cables phases earth must be connected in such a manner that it is impossible to tear them away or damage them in any fashion even for those items at low voltage Always check that the earthing wires are not those to neutral and vice versa i e the earthing wires must make an effective earthing The neutral must be employed as such and the earthing wire exclusively for that purpose Refer to the electric wiring diagrams for wiring up the motors in appendix III 23 Electric Wiring The unit must be earthed For the electric wiring the following considerations are applicable a e A Fan motors up to 7 5 kW size are suitable for an electrical connection with direct on line start For larger size fan motors star delta soft start systems must be foreseen to prevent excessive wear of the motors and of the transmission system if any If two speed motors Dahlander type are installed motors must be started at low speed and switched at high speed immediately after During the opposite procedure commuting from high to low speed provide for a system of delay in the switching at least 15 seconds in order to avoid overloading the motor winding Thermal overload protection of the fan motors should be provided calibrated for 1 1 x the motor power A cooling tower equipped with a fan motor of nominal output gt 3 kW requires a second power supply line The nominal voltage of the electrical c
48. y scaled The fill pack is scaled in The water distribution is not the nozzles to some areas uniform obtain a uniform water The water cooling is Water flow less than design Adjust the water flowrate insufficient Totally or partially replace effect demonstrated by an Probable scaling of the fill pack the fill increase in inlet and outlet Reduced air flow from the fans Check the fans and drive temp system where applicable Recirculation of wet discharge Check downward air air velocity Intake of hot air from other Install deflectors barriers sources units 36 Water carry over at the drift Excessive air flow Reduce the air flow eliminators droplet Eliminators incorrectly Reposition the drift entrainment positioned eliminators Partial scaling or clogging of Replace those eliminators eliminators l are scaled or Water leakage along the Damage to sealing during Restore water tightness in joints between panels transportation and or accordance with the installation instructions in this manual Excessive water loss via Make up float valve open too Lower the float ball far Effect the equalization of Lack of equalizing line between the pans sumps towers in parallel in the same circuit The water level in the sump Make up float valve Raise the float ball is much lower than the insufficiently open overflow The water suction into the Water level too low Adjust the float v
49. y a paint pistol for touch ups Caution do not leave tools inside the tower after a maintenance operation A 32 10 Painting Thoroughly check all the painted parts of the unit to detect possible areas where rust or corrosion has occurred In this case clean the part with a metal brush and apply a rust treatment product such as Ferox of Arexons Noverox etc These products will convert rust into inert salts follow the manufacturer s instructions After two or three days remove any excess product and apply good quality paint compatible with the existing one The external standard paint protection of Decsa units is ensured by an epoxy primer coating layer and a Polyurethanic final layer colour code RAL 5014 The Decsaprot execution includes an extra internal protection against corrosion by epoxy primer and bitumastic coating The Decsaprot execution is an option supplied on requested For any touch up or repair of galvanised components follow the instructions provided by the manufacturer of the cold zinc spray Basin and water filter flushing Empty the basin so as to eliminate all impurities Wash the water filter removing it if necessary Make up valve and water level check Check the float valve of the make up to ensure correct operation Tighten the bolts if necessary Inspection of nozzles Inspect nozzles to be sure that all of them give a full and continuous spray and are not obstructed or scaled by foreign matter
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