Related Manuals for BAC HFL 36 Series
Summary of Contents for BAC HFL 36 Series
- Page 1 MHFLv14EN HFL Hybrid Closed Circuit Cooling Tower 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...
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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 Construction Details 1 Construction Details W W W . B A L T I M O R E A I R C O I L . E U... - Page 6 1. Casing 19. Access door (circular) 2. Water distribution system 20. Make-up 3. Spray nozzles 21. Electrical water level control 4. Spray branches 22. Water bleed line 5. Evaporative heat transfer coil 23. Spray water pump 6. Finned discharge coil 24.
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Page 7: 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 8 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 9 OPERATING MODES The hybrid closed Circuit Fluid Cooler operates under three different operating modes: 1. Combined Dry-Wet Mode: During this mode, the process fluid flows through the finned coil bundle (sensible heat transfer) and then through the wetted prime surface coil bundle (sensible and latent heat transfer). With lower heat loads and/or ambient temperatures, the evaporative cooling portion (and hence the water usage) is reduced by keeping the flow fed through the wetted prime surface coil bundle to a minimum.
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Page 10: 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 11: 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 12: 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 13: 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 14 ® 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 15 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.
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Page 16: 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 17: 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 18: 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 19: Protection Against Coil Freezing
Whenever two speed motors are used for capacity control, a time delay of at least 15 seconds is required when switching form high to low speed. Sudden switch over might damage the drive system or the motor. When operating with VFD drives above nominal frequency be aware of the potential risk for motor overload or mechanical damages. - Page 20 Full draining of the heat exchanger coil is not guaranteed because of rising coil circuiting on the finned discharge coil (optional) and the risk for coil freeze-up remains. The local BAC Balticare representative should be consulted for guidelines on the installation of an emergency coil drain system.
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Page 21: 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 22 CAUTION Sump heaters can be hot. BELT TENSIONING Belt tensioning can be adjusted by changing the position of the fan motor(s) by rotating the motor base adjustment screw, which extends through the bottom frame angle. Check belt tension as follows: 1.
- Page 23 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 24 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 W W W . B A L T I M O R E A I R C O I L . E U...
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Page 25: 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 26 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 27 4. Clean eliminators from debris and foreign matter. Remove dirt and obstructions. Replace damaged or ineffective eliminators. 5. Install eliminators and ensure they fit tightly with no gaps. CAUTION Do not step on eliminators. WATER DISTRIBUTION The inspection procedure is as follows: 1.
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Page 28: Lubrication
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 During commissioning the tower should be filled manually till overflow level (push float ball under) to prevent air suction of the pump during first start-up. -
Page 29: Cleaning Procedures
grease intervals: twice a year unless otherwise shown on the nameplate of the motor grease products: see below The bearings should be lubricated only with a hand grease gun. Do not use high pressure grease guns, since they may rupture the bearing seals. When lubricating, purge the old grease from the bearing by gradually adding grease until a bead of new grease appears at the seal. - Page 30 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.
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Page 31: 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 32: 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 33 W W W . B A L T I M O R E A I R C O I L . E U...
- Page 34 W W W . B A L T I M O R E A I R C O I L . E U...
- 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 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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