BAC VXI 180 Operating And Maintenance Instructions Manual
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BAC VXI 180 Operating And Maintenance Instructions Manual

Closed circuit cooling towers
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MVXIv22EN
VXI Closed Circuit Cooling Towers
OPERATING AND MAINTENANCE INSTRUCTIONS

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Summary of Contents for BAC VXI 180

  • Page 1 MVXIv22EN VXI Closed Circuit Cooling Towers OPERATING AND MAINTENANCE INSTRUCTIONS...
  • Page 2 Water sampling, test results and corrective actions should be recorded in the cooling system logbook. For more specific recommendations on keeping your cooling system efficient and safe, contact your local BAC Balticare service provider or representative. Name, e-mail and phone number can be found on the website www.BACService.eu.
  • Page 3 Inspections and monitoring Start-Up Weekly Monthly Quarterly Every 6 Annually Shutdown months System overview Record keeping as per event Lubrication Start-Up Weekly Monthly Quarterly Every 6 Annually Shutdown months Fan shaft bearings Motor bearings* Adjustable motor base * only for motors with grease fittings with typical frame size > 200L (>30 KW) Cleaning procedures Start-Up Weekly...

  • Page 4: Table Of Contents

    Table of contents OPERATING AND MAINTENANCE INSTRUCTIONS Construction Details General information Operating conditions Connecting pipework Safety precautions Disposal requirements Non-walking surfaces Modifications by others Warranty Water Care About water care Biological control Chemical treatment Passivation Overflow connection Cold Weather Operations About cold weather operation Protection against sump water freezing Capacity control...

  • Page 5: Construction Details

    CONSTRUCTION DETAILS 1. Spray header 12. Motor base adjusting screw 2. High efficiency drift eliminators 13. Fan motor & Drive 3. Casing 14. Strainer 4. Coil 15. Adjustable float 5. Spray nozzles 16. Man size access door 6. Spray branches 17.

  • Page 6: General Information

    GENERAL INFORMATION Operating conditions BAC cooling equipment is designed for the operating conditions specified below, which must not be exceeded during operation. • Wind Load: For safe operation of unshielded equipment exposed to wind speeds above 120 km/h installed at a height above 30 m from the ground, contact your local BAC-Balticare representative.
  • Page 7 PURGE REQUIREMENTS The installer of BAC closed circuit cooling towers must ensure a proper air purging of the system prior to operation. Entrained air can restrict the capacity of the cooler, resulting in higher process temperatures. All connections (installed by others) must be leak free and tested accordingly.

  • Page 8: Connecting Pipework

    Connecting pipework All piping external to BAC cooling equipment must be supported separately. In case the equipment is installed on vibration rails or springs, the piping must contain compensators to eliminate vibrations carried through the external pipework. The equipment outlet piping must be installed under the operating level of the equipment to prevent air suction and pump cavitation.

  • Page 9: Disposal Requirements

    Modifications by others Whenever modifications or changes are made by others to the BAC equipment without written permission of BAC, the party who has done the modification becomes responsible for all consequences of this change and BAC declines all liability for the product.

  • Page 10: Warranty

    BAC will guarantee all products to be free from manufactured defects in materials and workmanship for a period of 24 months from the date of shipment. In the event of any such defect, BAC will repair or provide a replacement.

  • Page 11: Water Care

    WATER CARE About water care In all cooling equipment, operating in evaporative mode, the cooling is accomplished by evaporating a small portion of the re-circulating water as it flows through the equipment. When this water evaporates, the impurities originally present in the water remain. Unless a small amount of water is drained from the system, known as blow down, the concentration of dissolved solids will increase rapidly and lead to scale formation or corrosion or both.
  • Page 12 ® Baltibond Hybrid Coating and SST304L 6.5 to 9.2 pH during initial passivation Below 8.2 (for units with HDG coil only) Total hardness (as CaCO 50 to 750 mg/l Total alkalinity (as CaCO 600 mg/l max. Total dissolved solids 2050 mg/l max. Conductivity 3300 µS/cm Chlorides...
  • Page 13 SST304L SST316L SST316L with HDG coil (with SST316L coil) 6.5 to 9.2 6.5 to 9.5 pH during initial passivation Below 8.2 Not applicable (for units with HDG coil only) Total hardness (as CaCO 50 to 750 mg/l 50 to 750 mg/l Total alkalinity (as CaCO 600 mg/l max.

  • Page 14: Biological Control

    5. If it is proposed to operate a treatment programme outside the BAC Water Quality Control Guidelines, the BAC factory warranty may be invalidated if the water quality is persistently outside the Control Guidelines, unless specific prior written BAC approval.

  • Page 15: Overflow Connection

    ® Full stainless steel units and units protected by the Baltibond hybrid coating do not require passivation. An exception to this are units with a galvanized steel coil bundle which do still require the proper passivation procedure as described here in this section. In case you can't keep the pH below 8.2, a secondary approach is to conduct a chemical passivation using inorganic phosphate or film-forming passivation agents.

  • Page 16: Cold Weather Operations

    COLD WEATHER OPERATIONS About cold weather operation BAC cooling equipment can be operated in sub freezing ambient conditions provided the proper measures are taken. Listed below are general guidelines which should be followed to minimize the possibility of coil freeze-up.

  • Page 17: Protection Against Coil Freezing

    The desired method to match the cooling capacity to load and weather conditions is to adjust the air flow by the use of modulating controls (variable speed drives). Alternatively, multi speed fan motors or fan cycling can be applied, but fans operating on a common heat exchange section should always be operated simultaneously.
  • Page 18 If the process load is extremely light or shut off, it may be necessary to apply an auxiliary heat load during freezing conditions. Consult your local BAC Balticare representative for advice, if these conditions cannot be met. Draining of the coil(s) is not recommended as a normal method of freeze protection unless the coil(s) are constructed from stainless steel or are of the cleanable type.
  • Page 19 Model Minimum flow Appr. minimum heat load (kW) (l/s) VXI 9 VXI 18 VXI 27 VXI 36 VXI 50 VXI 70 VXI-C72 VXI 95 VXI-C108 VXI 144 13.0 VXI 145 VXI 180 11.0 VXI 190 16.0 VXI 215 13.0 VXI 288 26.0...

  • Page 20: Maintenance Procedure

    MAINTENANCE PROCEDURE Checks and adjustments COLD WATER BASIN AND BASIN STRAINERS The cold water basin should be inspected regularly. Any debris which may have accumulated in the basin or on the strainers should be removed. Quarterly, or more often if necessary, the entire cold water basin should be drained, cleaned and flushed with fresh water to remove the silt and sediment which normally collects in the basin during operation.
  • Page 21 Fixation and wrapping of float ball Operating height is the water level above sump bottom during operation. Operating water level 1. Operating height 2. Overflow Operating heights for the evaporative cooling equipment are indicated in the tables below: Model Operating height (measured from pan bottom) (mm) VXI-9, 18, 27, 36 VXI-50...
  • Page 22 6. Ensure that make-up water supply is adequate. This procedure does not apply for • equipment equipped with electrical water level control • remote sump applications If a float operated water make-up is used, initial setting and regular adjustments are needed. The float controlling the make-up valve is mounted on a threaded rod, held in place by wing nuts.
  • Page 23 Under no circumstances should sump heaters operate at other times as they could potentially heat the water to temperature levels, which are favourable to bacteriological growth. Ensure every six months the heater thermostat is properly set and clean. Also ensure that control and safety devices, such as low level cut out switches, are operational, clean and properly incorporated into the control circuit.
  • Page 24 Deflection force (kg) Diameter (mm) Belt profile motor sheave Min. Max. 80 through 125 135 through 200 >200 100 through 125 132 through 212 >212 Belt tension forces New belts have to be re-tensioned after 24 hours operation. If belt tensioning is required, please proceed as follows: 1.
  • Page 25 4. Start the fan(s) and check for proper rotation as indicated by the arrow on the fan housing. If rotation is wrong stop fan(s) and contact BAC. Forward curved centrifugal fan 5 Maintenance Procedure 5 Maintenance Procedure W W W .

  • Page 26: Inspections And Corrective Actions

    Unusual noise and/or vibration are the result of malfunctioning of mechanical components or operational problems (e.g. unwanted ice formation). If this occurs, a thorough inspection of the entire unit followed by immediate corrective action is needed. If required, consult your local BAC Balticare representative for assistance. Inspections and corrective actions...
  • Page 27 Selecting a coil cleaner is important since the cleaner must neutralise and remove deposits on the surface of the coil. BAC does not recommend the use of alkaline and acidic coil cleaners. These coil cleaners can cause foaming action (oxides or hydroxides of aluminium) resulting in the stripping away of minute layers of the base alloy and the attached soil.
  • Page 28 DRIFT ELIMINATORS The inspection procedure is as follows: 1. With fan(s) and pump(s) running visually check for areas with excessive drift loss. 2. Shut off fan(s) and pump(s) and visually check eliminators for obstructions damages cleanliness proper fit 3. If any of the above problems have been observed, stop fan(s) and pump(s) and remove eliminators. 4.
  • Page 29 External surface of motor for corrosion SPRAY WATER PUMP The BAC pump contains a mechanical seal between pump housing and pump motor. This seal needs to be checked quarterly for proper operation and replaced if necessary. ELECTRIC WATER LEVEL CONTROL PACKAGE (OPTIONAL) The electric water level control package (optional) maintains a constant water level in the cold water sump independent of cooling load changes and water supply pressure variations.

  • Page 30: Lubrication

    Lubrication FAN SHAFT BEARINGS The fan shaft is supported by ball bearings (see figure below). Under normal operating conditions the bearings should be greased every 2000 operating hours or at least every six months. The bearings should be lubricated with one of the following water resistant inhibited greases (or an equivalent), which are good for ambient temperature ranging from -20°C to 120°C or an equivalent.

  • Page 31: Cleaning Procedures

    6 hours. Higher chlorine levels for a shorter period are possible, but require a higher level of corrosion protection than galvanized steel only. Consult your BAC Balticare representative for further information.
  • Page 32 A proper regularly monitored biocide programme reduces the need for cleaning and disinfection actions significantly. W W W . B A L T I M O R E A I R C O I L . E U...

  • Page 33: Comprehensive Maintenance

    Remove and store fan belts and access door gaskets. • Hot dip galvanized and stainless steel coils of BAC closed circuit cooling towers are filled with a low pressure inert gas at the factory before shipping, to ensure an optimal internal corrosion protection. It is recommended to check the overpressure every six months (connect a manometer to the valve).

  • Page 34: Further Assistance & Information

    FURTHER ASSISTANCE & INFORMATION Assistance BAC has established a specialized total care company called Balticare. The BAC Balticare offering involves all elements required to ensure a safe and efficient operation of your evaporative cooling products. For more details, contact your local BAC representative for further information and specific assistance at www.BaltimoreAircoil.eu...
  • Page 35 W W W . B A L T I M O R E A I R C O I L . E U...
  • Page 36 W W W . B A L T I M O R E A I R C O I L . E U...
  • Page 37 W W W . B A L T I M O R E A I R C O I L . E U...
  • Page 38 COOLING TOWERS CLOSED CIRCUIT COOLING TOWERS ICE THERMAL STORAGE EVAPORATIVE CONDENSERS HYBRID PRODUCTS PARTS, EQUIPMENTS & SERVICES www.BaltimoreAircoil.eu info@BaltimoreAircoil.eu Please refer to our website for local contact details. Industriepark - Zone A, B-2220 Heist-op-den-Berg, Belgium © Baltimore Aircoil International nv...

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