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Related Manuals for BAC RC Series
Summary of Contents for BAC RC Series
- Page 1 RC Series OPERATION & MAINTENANCE MANUAL...
- Page 3 Construction Details Figure 1. Typical cross section...
- Page 4 • WARNING: Do not perform any service on or near the fans, motors, and drives, or inside the unit without first ensuring that the fans and pumps are disconnected, locked out, and tagged out. • WARNING: Check to ensure the controls for the fan motor are set to allow a maximum of six on-off cycles per hour to prevent motor overload. • WARNING: Openings and/or submerged obstructions may exist in the bottom of the cold water basin. Use caution when walking inside this equipment. • WARNING: The top horizontal surface of the unit is not intended to be used as a walking surface or working platform. If access to the top of the unit is desired, the purchaser/end-user is cautioned to use appropriate means complying with applicable safety standards of governmental authorities. • WARNING: Drift eliminators on RC Series units are not designed to support the weight of a person or to be used as a storage or work surface for any equipment or tools. • WARNING: When the fan speed of the unit is to be changed from the factory set speed, including changes achieved by the use of a variable fan speed device, steps must be taken to avoid operation at or near the fan’s “critical speed” which could result in fan failure and possible personal injury or damage. Contact your local BAC Representative regarding any such applications. Additionally, inverter duty motors are required on installations that are to be controlled by VFDs. • WARNING: The re-circulating water system may contain chemicals or biological contaminants, including Legionella, which could be harmful if inhaled or ingested. Personnel exposed directly to the discharge airstream and the associated drift mists, generated during operation of the water distribution system and/or fans, or mists produced by high pressure water jets or compressed air (if used to clean components of the re-circulating water system), must wear respiratory protection equipment approved for such use by governmental occupational safety and health authorities. • WARNING: The basin heater is not designed to prevent icing during unit operation. General Maintenance Information The services required to maintain a piece of evaporative cooling equipment are primarily a function of the quality of the air and water in the locality of the installation: • AIR: The most harmful atmospheric conditions are those with unusual quantities of industrial smoke, chemical fumes, salt, or heavy dust. Such airborne impurities are carried into the equipment and absorbed by the re-circulating water to form a corrosive solution.
- Page 5 Cautions • CAUTION: BAC units are typically installed immediately after shipment and many operate year round. However, if the unit is to be stored for a prolonged period of time either before or after installation, certain precautions should be observed. For instance, covering the unit with a clear plastic tarpaulin during storage can trap heat inside the unit, potentially causing damage to the fill and other components. If units must be covered during storage, an opaque, reflective tarp should be used. For normal seasonal shutdowns, refer to the applicable section in this manual. • CAUTION: All electrical, mechanical, and rotating machinery are potential hazards, particularly for those not familiar with their design, construction, and operation. Accordingly, use appropriate lockout procedures. Adequate safeguards (including the use of protective enclosures where necessary) should be taken with this equipment both to safeguard the public from injury and to prevent damage to the equipment, its associated system, and the premises. • CAUTION: When reversing the direction of fan rotation, allow the fan to come to a complete stop before restarting the motor. • CAUTION: Do not use oils containing detergents for bearing lubrication. Detergent oils will remove the graphite in the bearing sleeve and cause bearing failure. Also, do not disturb bearing alignment by tightening the bearing cap adjustment on a new unit, as it is torque adjusted at the factory. • CAUTION: Do not use steam or high pressure water to clean PVC eliminators or materials other than steel. • CAUTION: This equipment should never be operated without all fan screens, access panels, and access doors in place. For the protection of authorised service and maintenance personnel, install a lockable disconnect switch located within sight of the unit on each fan motor associated with the equipment. • CAUTION: Mechanical and operational methods must be employed to protect these products against damage and/or reduced effectiveness due to possible freeze-up. Contact your local BAC Representative for recommended protection alternatives. • CAUTION: Pressure greater than 69 kPa may cause damage to the distribution system. • CAUTION: Never use chloride or chlorine based solvents such as bleach or muriatic (hydrochloric) acid to clean stainless steel. It is important to rinse the surface with warm water and wipe with a dry cloth after cleaning. • CAUTION: All cooling equipment should be located as far away as possible from occupied areas, open windows or air intakes to buildings.
- Page 6 Recommended Maintenance Service Inspect and clean as necessary: Start-Up Monthly Quarterly Annually Shutdown Inspect general condition of the unit and check unit for unusual noise or vibration Inspect cold water basin Flush water distribution system/Inspect spray nozzles Drain basin and piping Inspect combined inlet shields Check and adjust water level in basin(s) Check operation of make-up valve...
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Page 7: Table Of Contents
Table of Contents OPERATIONS & MAINTENANCE » RC SERIES Construction Details Warnings and Cautions PART 1 Operation and Maintenance Initial & Seasonal Start-Up Extended Shutdown Prolonged Outdoor Storage PART 2 Detailed Component Maintenance Procedures Cold Water Basin Fan Drive System (Belt Direct Drive Units) -
Page 8: Operation And Maintenance
RC SERIES Operation and Maintenance INITIAL AND SEASONAL START -UP EXTENDED SHUTDOWN PROLONGED OUTDOOR STORAGE... -
Page 9: Initial & Seasonal Start-Up
Operation and Maintenance Initial & Seasonal Start-Up Initial & Seasonal Start-Up General Cleaning General Inspection • If the unit is mounted on vibration isolators or isolation rails (by others), refer to the vibration isolation manufacturer’s guidelines before loading/unloading weight from the unit. • Verify fan and unit pump motors are disconnected, locked out, and tagged out. Cleaning • Drain the cold water basin with the strainer in place. • Remove all dirt and debris from the fan guard(s). • Flush the water distribution system. Inspect and clean all spray nozzles. • Clean all of the mechanical components, such as the fan and motor. • Flush the cold water basin to remove any accumulated dirt and debris. • Remove, clean, and replace the basin strainer. Inspection • Conduct external inspection of the equipment. Check for leaks, corrosion, and any structural damage. • Conduct internal inspection of the equipment. Check for anything unusual such as structural or mechanical component damage. - Page 10 69 kPa may cause damage to program or administer a shock treatment of appropriate biocides the distribution system. prior to operating the cooling tower fans. This will eliminate accumulated biological contaminants. • Set the make-up valve float so the water shuts off at the overflow level. • Start the unit pump and check for the proper rotation indicated by the arrow on the pump cover. • On installations where the unit pump was not furnished by BAC, a globe valve should be installed in the pump discharge line and the pump flow rate adjusted to the correct water flow and pressure (2.25 psig at spray header connection). • Check that the float operated make-up valve is operating freely. Closely monitor water level and adjust as necessary during the first 24 hours of operation. • Check the nozzle spray pattern as described in “Water Distribution After 24 hours of operation System and Heat Transfer System” on Page 19.
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Page 11: Extended Shutdown
Operation and Maintenance Extended Shutdown Initial & Seasonal Start-Up Start-up Perform the following services whenever the unit is shutdown in Extended Shutdown excess of three days: • If the unit is mounted on vibration isolators or isolation rails (by others), refer to the manufacturer’s guidelines before loading/ unloading weight from the unit. • Disconnect, lock-out, and tag-out all fans and pumps. • Close the shut-off valve in the make-up water line (supplied by others), and drain the cold water basin and all exposed water piping. Heat trace and insulate all exposed piping. • Clean all the debris, such as leaves and dirt, from the interior and exterior of the unit. • Leave the cold water basin drain open so rain and melting snow will drain from the unit. -
Page 12: Prolonged Outdoor Storage
Precautions for RCC Evaporative Condensers - RCC Storage Prior to Installation - The coils are charged with nitrogen at 100kPa at the factory. - RCC Extended Shutdown Periods after Start-Up - The coils should be charged with nitrogen at 100kPa in the field and capped by adding a threaded connection or a welded cap. Upon start-up, the coil connections will require cutting and bevelling. • Apply a weather-resistant lubricant or heavy grease such as Anti-Seize (BAC Part # 160069) to all exposed threaded or flanged connections and the adjustable motor base threaded rod. • Insert desiccant bags into the control panel (if supplied) to absorb moisture. Seal the control panel for storage. • Spray coat electrical component housings (if supplied) with a suitable protective coating, such as Cosmoline® Weathershed, and individually cover them with plastic, taking care to leave openings for free air circulation. • Inspect the protective finish on the unit. Clean and refinish as required. Refer to “Corrosion Protection” on page 24 for more details. M A R 2 1 0 - 2 W W W . B A L T I M O R E A I R C O I L . C O M . A U... - Page 13 Operation and Maintenance Prolonged Outdoor Storage Motor Recommendations Storage Preparation BAC standard motors are designed for storage at ambient temperatures Motor Recommendations of -20ºC to 40ºC. Prolonged periods of exposure above or below these specified conditions could degrade components of the motor and cause malfunction or premature failure. • Motors should be removed and stored inside whenever possible. When indoor storage is not possible the motors must be covered with a tarpaulin. Do not use plastic or plastic film. This cover should extend below the motor and be secured; however, it should not tightly wrap the motor. This will allow the captive air space to breathe, minimizing formation of condensation. • Care must also be taken to protect the motor from flooding or from harmful chemical vapors. • The storage area should be free from ambient vibration. Excessive vibration can cause bearing damage. Motors that must be stored in areas with high ambient vibration, such as from heavy construction equipment or other sources, must have the shaft locked to prevent any movement. • Precautions should be taken to prevent rodents, snakes, birds, or other small animals from nesting inside the motors. In areas where they are prevalent, precautions must also be taken to prevent insects from gaining access to the interior of the motor. • If not stored indoors in a controlled environment, some form of heating must be utilized to prevent condensation from accumulating in the motor. This heating should maintain the winding temperature...
- Page 14 • Reinstall all fan belts, motors, door gaskets, and drain plugs (as applicable), and remove all protective coverings. • For units stored prior to installation, conduct rigging procedures as directed in the unit’s Rigging and Assembly Instructions, available on www.BaltimoreAircoil.com.au or by contacting your local BAC Rep. • Perform an insulation test of motor windings to ensure satisfactory insulation resistance. • Conduct full start-up procedure as stated in the “Start-Up Procedure” on page 4. Be especially thorough for cleaning and inspection prior to start-up. M A R 2 1 0 - 2 W W W . B A L T I M O R E A I R C O I L . C O M . A U...
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Page 15: Detailed Component Maintenance Procedures
RC SERIES Detailed Component Maintenance Procedures COLD WATER BASIN FAN DRIVE SYSTEM (BELT DRIVE UNITS) FAN DRIVE SYSTEM (DIRECT DRIVE UNITS) FAN MOTORS FAN SHAFT BEARINGS LOCKING COLLARS FAN SHAFT ACCESS DOOR LOUVRES AND ELIMINATORS WATER DISTRIBUTION AND HEAT TRANSFER SECTION... -
Page 16: Cold Water Basin
Cold Water Basin As water circulating through the cooling tower is cooled, it collects in the cold water basin and passes through the suction strainer into the system. Water Levels Model Number At Overflow Level (mm) At Operating Level (mm) All RC models (except RC*-1111) RC*-1111 Table 1. Cold Water Basin Water Levels • The values shown in Table 1 are relative to the base of the unit. • The make-up valve controls the operating level, which is maintained WARNING: Do not use acid to at the levels shown in Table 1. -
Page 17: Fan
– Check each blade in the area of the shank for any signs of the unit without first ensuring cracking. If cracking is found, the fan motor should be locked that the fans and pumps are out immediately. Contact your local BAC Representative for assistance. disconnected, locked out, and tagged out. • Tip Clearance: Check the clearance between the tip of the blade and the fan cowl. The clearance should be between 3mm and 13mm. • Blade Pitch: Check to ensure that the blades are all at the same pitch. If uncertain, measure the pitch with an inclinometer. All... - Page 18 Fan Drive System (Belt Drive Units) Belt Drive Power Train The drive train consists of SPB belts, a fan sheave and a motor sheave. The high efficiency belts provide the premium quality necessary for evaporative cooling equipment. Together these components provide a highly reliable system with low maintenance requirements. The drive train should be inspected periodically to check the belt tension, condition of the sheaves and belt, and when necessary adjust the tension. The recommended service intervals are specified elsewhere. 6mm to 9mm 6mm to 9mm Figure 3a. Belt Tension with a Straight Edge Figure 3b. Belt Tension with a Tape Measure Inspection & Maintenance The belt drive power train requires a periodic check of belt condition and, when necessary, tension adjustment. The recommended service intervals are as follows: • Initial Start-Up:...
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Page 19: Fan Drive System (Belt Direct Drive Units)
Detailed Component Maintenance Procedures • Belt tension check: Fan Drive System – Place a straight edge along the belt from sheave to sheave as (Belt Drive Units) shown in Figure 3a, or use a tape measure as shown in Figure Belt Drive Power Train 3b to measure belt deflection. Inspection & Maintenance – Apply a moderate force by hand (approximately 2kg) evenly across the width of the belt in the centre of the span between the sheaves. – There is adequate belt tension if the belt deflects between 6mm and 9mm as shown in Figures 3a and 3b. – • Belt tension adjustment (if required): 1. Loosen the motor pulley guard retaining nuts. - Page 20 Alignment • Check the drive alignment annually to ensure maximum belt life. • Drive alignment check and adjustment: – Place a straight edge across the driver and the driven sheaves as shown in Figure 5. – The straight edge should contact all four points as shown in Figure 5 indicating that the drives are properly aligned. – There should be no more than 1.5mm deviation from four points of contact. – In case of realignment, loosen the motor sheave and align it with the fan sheave. Allow 6mm for draw-up as the bushing screw is retightened. WARNING: Check to ensure the controls for the fan motor are set to allow a maximum of six on-off cycles per hour to prevent motor overload.
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Page 21: Fan Drive System (Direct Drive)
Detailed Component Fan Motors Maintenance Procedures Fan Drive System (Belt Drive Units) cont. Fan Drive System Descriptions Alignment Direct Drive Motors: For direct driven units the motor is TEAO epoxy Fan Drive System coated IP66. (Direct Drive Units) Belt Drive Motor: The fan motor used on belt driven units is a TEFC Drive Train motor, with permanently lubricated ball bearings. The motor is Fan Motors installed fully outside of the wet air stream. Fan Drive System Descriptions Electrical Connection (by others): All electrical connections should Inspection and Maintenance be carried out by qualified & approved/licensed electrical personnel... -
Page 22: Fan Shaft Bearings
Fan Shaft Bearings The fan shaft is supported by two flange mounted ball bearings, each equipped with a lubrication fitting and a slinger/locking collar to keep out moisture. The bearings should be lubricated as follows: Inspection and Maintenance • Only lubricate the bearings with a manual grease gun. Do not use high-pressure grease guns since they may rupture the bearing seals. • Bearings come pre-packed with Castrol EPL2 grease. BAC recommends re-packing only with a compatible water resistant, mineral base grease with a lithium thickener. • Lubricate the bearings as follows: – Initial Start-up: Normally, no lubrication is required since the bearings have been lubricated at the factory prior to shipment. However, if the cooling tower has been stored at the job site for more than 1 year, both bearings should be lubricated with new grease before initial operation. When lubricating, purge the old grease from the bearing by gradually adding grease until a bead of new grease appears at the seal on the underside of the bearing. – Seasonal Start-up: Purge both bearings with new grease prior to start-up. – Operation: Purge bearings every three months while in operation. – Extended Shutdown: Purge bearings with new grease prior to any prolonged storage or downtime. M A R 2 1 0 - 2... -
Page 23: Locking Collars
Detailed Component Locking Collars Maintenance Procedures Fan Shaft Bearings Each eccentric locking collar should be checked every six months to Inspection & Maintenance ensure that the inner bearing race is secured to the fan shaft. The Locking Collars locking collar can be set using the following procedure (See Figure 7). Fan Shaft 1. Loosen the set screw. 2. Using a drift pin, tap the collar (in the hole provided) tangentially in the direction of rotation while holding the shaft. 3. Retighten the set screw. Bearings with Extended Locking Collars Lube Fittings Figure 7. Fan Shaft Bearings Fan Shaft The fan shaft is fabricated from stainless steel. The exposed areas of the fan shaft are coated with a soft seal for added corrosion protection. -
Page 24: Access Door
Access Door The large access door is easily removed to provide complete access to drift eliminators, spray system and fill. WARNING: The access door To remove the door, take out the louvres from door side. Loosen and remove the knobs that hold the door in place. Larger units are provided should not be removed without with convenient anchor points to assist in removing the door and first ensuring the fan and pump securing the door to the unit when removed. motors have been isolated, tagged and locked in the off position. WARNING: Damaged or missing drift eliminators will result in excessive drift from the tower. -
Page 25: Water Distribution And Heat Transfer Section
Detailed Component Water Distribution System and Heat Transfer Section Maintenance Procedures Access Door Water is distributed through a corrosion resistant polyvinyl chloride Louvres and Eliminators (PVC) spray distribution system. The drift eliminators are made of PVC, Water Distribution System and which requires no protection against rot, decay, rust, or biological attack. Heat Transfer Section The inspection procedure is as follows: • Shut off the fan and lock out and tag out the fan motor. Turn off the recirculating pump. • Remove the door and take out the drift eliminators to allow a clear view of the spray distribution system and nozzle patterns. • Start the pump. Check to see if the nozzles are all spraying consistently and producing the spray pattern shown in Figure 9. • Clean any nozzles that are clogged. If necessary, the nozzle and rubber grommet may be removed for cleaning. If additional cleaning is necessary the branch may be removed for cleaning. -
Page 26: Water Level Control
Water Level Control There are two types of water level controls used on BAC cooling towers: • Mechanical make-up valve assembly • Optional electric water level control package Mechanical Make-up Valve Assembly A float-operated mechanical water make-up assembly is furnished as standard equipment on the cooling tower. The standard make-up NOTE: If the unit has been assembly consists of a corrosion resistant make-up valve connected to ordered with the optional a float arm assembly actuated by a polystyrene-filled plastic float. The electric water level control float is mounted on an all-thread rod held in place by wing nuts. The... - Page 27 Detailed Component Maintenance Procedures Water Level Control Float Arm Assembly Mechanical Make-up Valve Assembly Wing Nuts Float Valve All Threaded Rod Float Ball Figure 10. Water Make-Up Valve Assembly CAUTION: Do not use steam or high pressure water to clean PVC eliminators or materials other Optional Electric Water Level Control Package than steel.
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Page 28: Corrosion Protection
RC SERIES Corrosion Protection WATER TREATMENT CORROSION AND SCALE CONTROL BIOLOGICAL CONTROL GRAY WATER AND RECLAIMED WATER CHEMICAL TREATMENT REQUIREMENTS PASSIVATION LONG TERM CARE OF STAINLESS STEEL SYSTEM CLEANING... -
Page 29: Water Treatment
Corrosion Protection Water Treatment BAC products are constructed of corrosion-resistant materials. Other materials listed below are used in the equipment construction: • Galvanized Steel Components: Inspect the galvanized steel components for blemishes or corrosion. Wire brush and recoat the affected areas with a cold galvanizing compound such as zinc rich compound (ZRC). • Stainless Steel Components: Inspect stainless steel components for signs of blemishes or corrosion. See “Long Term Care of Stainless Steel” on page 27 for cleaning and care instructions. Water Treatment A proper water treatment program, administered under the supervision of a water treatment specialist, is an essential part of routine maintenance to ensure the safe operation and longevity of evaporative cooling equipment, as well as other system components. In evaporative cooling products, cooling is accomplished by evaporating a small portion of the recirculating water as it flows through the unit. As the water evaporates, the dissolved solids originally present in the water remain behind and if not controlled, the concentration of dissolved solids will increase rapidly. This can lead to corrosion, scale, or biological fouling which may negatively affect heat transfer as well as the longevity of system components. A water treatment program must handle the following: • Corrosion - Red rust on steel components and white rust on galvanized surfaces may affect the longevity of system components. • Scale Formation - Scale not only reduces heat transfer and system efficiency, but also may lead to under deposit corrosion. If scale is not controlled, it may continue building on critical components and severely impact thermal performance. • Biological Fouling - Slime and algae formations may reduce heat transfer, promote corrosion, and harbour pathogens such as Legionella. -
Page 30: Corrosion And Scale Control
Corrosion and Scale Control 1. To control corrosion and scale, maintain the water chemistry of the re-circulating water within certain parameters. The specific measures required vary from system to system and are dependent on the chemistry of the make-up water, the metallurgy of the piping and heat transfer devices exposed to the re-circulating water and the temperatures at which the system will be operating. 2. Bleed/blowdown, the continuous flow of a small portion of the re- circulating water to drain, is used to control the concentration of dissolved solids. On rare occasions, this may be adequate to control scale and corrosion. More often, however, chemical scale and corrosion inhibitors are necessary, which raise the allowable level of dissolved solids without the risk of scale and corrosion. 3. Keep the chemically treated water within the guidelines given in the NOTE: Stainless steel cold water below table. Your water treatment specialist may recommend more basins do not require passivation. conservative limits than those shown in the table. However, if the upper structure is galvanized steel, passivation is required on the galvanized area including any Hot Dip Galvanized ZAM / Galvanised Steel... -
Page 31: Biological Control
Corrosion Protection Biological Control Corrosion and Scale Control Biological Control • The warm, oxygen and nutrient rich environment inside evaporative Gray Water and Reclaimed Water cooling equipment provides an ideal environment conducive to the growth of algae, slime, and other micro-organisms. Uncontrolled, this can reduce heat transfer, promote corrosion, and promote the growth of potentially harmful organisms such as Legionella. • To avoid biological contamination and minimize the risk of Legionella, initiate the biocide treatment program at start-up and continue on a regular basis thereafter in accordance with the treatment supplier’s instructions. • Bleed/blowdown or chemical treatment used for corrosion and scale control alone is not adequate for control of biological contamination. • Introduce solid or granular biocides through a chemical “pot” feeder installed in parallel with the system circulating pump. Diluted liquid biocides may be added directly to the cold water basin. • If ozone water treatment is used, at no point should concentrations exceed 0.5 ppm to avoid corrosion. Gray Water and Reclaimed Water The use of water reclaimed from another process as a source of makeup water for evaporative cooling equipment can be considered as long as the resultant recirculating water chemistry conforms to the... -
Page 32: Chemical Treatment Requirements
Chemical Treatment Requirements Chemical treatment programs must meet the following requirements: • The chemicals must be compatible with the unit materials of construction as well as other materials used in the system (pipe, heat exchanger, chiller, etc.) • Chemical scale and corrosion inhibitors, particularly acid (if used), should be introduced into the circulating water through automatic feeders. This should be done at a point in the system where total mixing and dilution occur before reaching the evaporative cooling equipment. The preferred injection point for chemical scale and corrosion inhibitors is on the discharge side of the system circulating pump(s). These chemicals should not be batch fed directly into the unit’s cold water basin or water distribution system, as this can severely damage areas directly contacted. • When chlorine is added to the system, free residual chlorine should not exceed 1 ppm, except during start-up if biological shock treatment is utilized during treatment. Refer to “Start-Up” on page 5 for limits. Exceeding this limit may accelerate corrosion. Passivation • Passivation is the formation of a protective, passive, carbonate layer on galvanized steel surfaces, including unit panels and galvanized coils. • To provide maximum protection from corrosion on newly installed units take special measures to passivate galvanized steel surfaces. • To ensure proper passivation of the galvanized steel, keep the pH of the circulating water between 7.0 to 8.2 for four to eight weeks after start-up, or until new zinc surfaces turn dull gray in colour. • If white rust forms on galvanized steel surfaces after the pH is returned to normal service levels, the passivation process must be repeated. M A R 2 1 0 - 2 W W W . -
Page 33: Long Term Care Of Stainless Steel
Corrosion Protection Long Term Care of Stainless Steel Chemical Treatment Requirements Passivation When the percentage of chromium in steel exceeds 10.5%, it is called Long Term Care of Stainless Steel stainless steel. The chromium in the steel reacts with the oxygen in the BAC’s Manufacturing Process air to form a chromium-oxide surface layer, also called the passivation Jobsite Considerations layer that provides the corrosion resistance in stainless steel. Recommened Cleaning Procedure BAC’s Manufacturing Process BAC takes precautions to prevent cross-contamination, processing galvanized and stainless steel parts separately. Also, stainless steel brushes are used to clean welds on stainless parts and care is taken to avoid scratching parts during processing. Organic cleaners are used to clean the finished product prior to shipping. Jobsite Considerations... -
Page 34: System Cleaning
• Occasionally the surface of stainless steel can get iron chips or shavings embedded in it from having galvanized steel machined or welded in the vicinity. The iron chips can start to rust, reducing the corrosion resistance of the stainless steel, and stain the surface giving the impression that the stainless steel is rusting. These types of contaminants require more aggressive cleaning. Mild abrasives such as Scotch-Brite™ products may be used where aesthetic considerations are not important followed by solvent cleaning with organic solvents as described above. It is important to rinse the surface with warm water and wipe with a dry cloth after cleaning. • If the iron chips are not removed with the Scotch-Brite™ Products, electro-chemical cleaning may be required. BAC uses commercially available equipment for electro-chemical cleaning in the field. Contact your local BAC Representative for more information. System Cleaning System Cleaning for RCF Models Prior to start-up, the condenser water systems through a closed circuit cooling tower can be cleaned using an alkaline solution. When cleaning, follow the necessary precautions: • Limit the duration of the cleaning to one day or at the most two days. • The temperature of the solution should never exceed 38°C. • The maximum concentration of chemicals in the circulation solution should not exceed any of the following: M A R 2 1 0 - 2... - Page 35 Corrosion Protection Long Term Care of Stainless Steel – 5% Sodium Hydroxide Recommened Cleaning Procedure (cont) – 5% Sodium Metasilicate System Cleaning – 2% Sodium Carbonate System Cleaning for RCF Models – 2% Tetra Sodium Pyrophosphate Coil Cleaning for RCF Models – 0.5% Trisodium Phosphate Weld By-product Cleaning – 0.5% Sodium Nitrate – 5-10% Butyl Cellosolve Coil Cleaning for RCF Models The outside of the heat exchange coil may require occasional cleaning. The chemicals used must be compatible with the materials being treated. For example, the standard coil outside is galvanized steel. The inside of the coil is black carbon steel. For finned coils, the...
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Page 36: Bleed Rate
RC SERIES Bleed Rate... - Page 37 The evaporation rate is dependent on the wet bulb temperature and load. The equation shown above provides the maximum bleed rate on the design day. Contact your local BAC representative for an exact calculation based on specific site conditions. M A R 2 1 0 - 2 W W W . B A L T I M O R E A I R C O I L . C O M . A U...
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Page 38: Cold Weather Operation
RC SERIES Cold Weather Operation INSPECTION AND MAINTENANCE FAN SECTION ICING PROTECTION BASIN WATER AND INTERNAL PIPING FREEZE PROTECTION COIL FREEZE PROTECTION... -
Page 39: Fan Section Icing Protection
Inspection & Maintenance Cold Weather Operation Inspection & Maintenance BAC products can be operated at subfreezing ambient temperatures Fan Section Icing Protection provided proper operating methods are established and diligently followed. Temperature Setting Fan Control • Carry out frequent visual inspections and routine maintenance services during operation in subfreezing weather. • Ensure all controls for capacity and freeze protection are set properly and functioning normally. • Prevent excessively high water levels and possible overflow of the cold water basin due to over pumping, clogged strainers, or make-up valve malfunction. • Some unit icing can be expected in very cold weather. Usually this will not affect the operation of the unit. Resolve any icing conditions that may damage the unit or the supports, impair the system performance, or create a safety hazard. Fan Section Icing Protection There are three basic operational methods which can be used to provide the system’s required cooling: temperature setting, fan control, and dry operation. The method of control employed on a given application... -
Page 40: Basin Water And Internal Piping Freeze Protection
Basin Water and Internal Piping Freeze Cold Water Basin Protection It is important to protect the basin and internal piping. The basin water could freeze when the unit is shutdown and exposed to subfreezing ambient temperatures. • Remote Sump: The ideal method of protection is a remote sump located in a heated indoor space. When the circulating pump stops, the water in the connecting piping will drain by gravity to this indoor sump. • Basin Heaters: On applications without a remote sump, heat must be provided to the cold water basin. Electrical immersion heaters can provide the required function. Contact your local BAC Representative for details. • Electric Water Level Control: An electric water level control will maintain the proper water level regardless of the thermal load or variations in make-up water supply pressure. The two-position, slow closing solenoid valve provided with the BAC electric water level control package also minimizes valve freezing problems. • Heat Tracing: Heat trace and insulate all exposed water piping including pump piping below the overflow level and make-up water lines with electrical heater tape. M A R 2 1 0 - 2... -
Page 41: Coil Freeze Protection
10°C. Contact your local BAC Representative for guidelines on the installation of an emergency coil drain system. M A R 2 1 0 - 2 W W W . B A L T I M O R E A I R C O I L . C O M . A U... -
Page 42: Factory Authorised Parts
RC SERIES Factory Authorised Parts THE PERFECT FIT... -
Page 43: The Perfect Fit
Factory Authorised Parts The Perfect Fit The Perfect Fit To Ensure Perfect Performance Your evaporative cooling equipment is only as good as the sum of its parts. Baltimore Aircoil factory authorised replacement parts and accessories are engineered and manufactured to original equipment specifications and are guaranteed to be The Perfect Fit. These high quality components can eliminate unnecessary, costly and time consuming problems caused by non factory authorised parts. They are fully warranted to ensure long, trouble free operation. BAC original equipment parts also help maintain the thermal performance of CTI Certified models of BAC evaporative cooling equipment. In addition, BAC quality parts and accessories are fully compatible with other manufacturers’ equipment. For Service and Preventative Maintenance BAC products are designed for long, trouble-free operation and BAC factory authorised parts provide everything you need to service and maintain your evaporative equipment with confidence. To ensure optimum performance and maximum service life, it is important that a program of regular inspection and maintenance be completed. Your experienced BAC sales & service office and/or BAC appointed representative is factory trained and available to assist you. For Performance Enhancement Baltimore Aircoil’s ongoing research and development programs result in continual product performance and system durability improvements. - Page 44 COOLING TOWERS CLOSED CIRCUIT COOLING TOWERS ICE THERMAL STORAGE EVAPORATIVE CONDENSERS HYBRID PRODUCTS PARTS & SERVICES w w w . B a l t i m o r e A i r c o i l . c o m . a u 120 Wisemans Ferry Road, Somersby NSW 2250 ›...
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