BAC VCL Operating And Maintenance Instructions Manual
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BAC VCL Operating And Maintenance Instructions Manual

Evaporative condenser
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M VCLv14 EN
VCL Evaporative Condensers
OPERATING AND MAINTENANCE INSTRUCTIONS

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  • Page 1 M VCLv14 EN VCL Evaporative Condensers 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 Circulating water quality System overview Record keeping as per event Lubrication Start-Up Weekly Monthly Quarterly Every 6 Months Annually Shutdown Fan shaft bearings Motor bearings* Adjustable motor base * only for motors with grease fittings with typical frame size >...

  • Page 4: Table Of Contents

    Table of Contents OPERATING AND MAINTENANCE INSTRUCTIONS Construction Details General Information Operating Conditions Connecting Pipework Safety Precautions Disposal Requirements 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 Maintenance Procedure Checks and Adjustments...

  • Page 5: Construction Details

    CONSTRUCTION DETAILS 1. Casing 2. Water Distribution Section 3. High Efficiency Drift Eliminators 4. Forward curved centrifugal Fan 5. Fan shaft and bearing 6. Fan motor 10. Coil 11. Pump 12. Mansize access door 1 Construction Details 1 Construction Details W W W .

  • Page 6: General Information

    PURGE REQUIREMENTS The installer of BAC condensers must provide a proper system purging, which enables purging air from the coils prior to operation. Entrained air can obstruct free drainage of cooling medium and reduce thermal capacity. All connections (installed by others) must be leak free and tested accordingly.

  • Page 7: Safety Precautions

    When the equipment is operated with a variable fan speed control device, steps must be taken to avoid operating at or near to the fan's «critical speed». For more information consult your local BAC Balticare representative. ELECTRICAL SAFETY Each fan and pump motor associated with this equipment should be installed with a lockable disconnect switch located within sight of the equipment.

  • Page 8: Disposal Requirements

    LOCATION All cooling equipment should be located as far away as possible from occupied areas, open windows or air intakes to buildings. LOCAL REGULATIONS Installation and operation of cooling equipment may be subject of local regulations, such as establishment of risk analysis.

  • Page 9: 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 10 ® BALTIBOND Hybrid Coating and SST304 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 11: Biological Control

    3. BAC specifically discourages acid dosing as mean of scale control (unless under certain strict circumstances for open circuit cooling towers with very large system volume and remote sump, or constructed from stainless steel).

  • Page 12: Passivation

    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. (Some parameters may be exceeded under certain strict circumstances.) It is strongly recommended to check the key parameters of the circulating water quality on a monthly base.

  • Page 13: Cold Weather Operations

    COLD WEATHER OPERATIONS About Cold Weather Operation BAC equipment can be operated in subfreezing ambient conditions provided the proper measures are taken: 1. Protection against sump water freezing, when the system is idle. 2. Capacity control to prevent ice formation during operation.
  • Page 14 5°C, but there are applications, where even lower temperatures can be accepted. (Contact your local BAC Balticare representative for advice.) The desired method to match the cooling capacity to load and weather conditions is to adjust the air flow, either by cycling of the fan(s) (but always for ALL the fans on a specific cell), the use of multi speed fan motors or modulating controls (variable speed drives).

  • Page 15: 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 16 Operating Water level 1. Operating height 2. Overflow 3. Pan Bottom Operating heights for the evaporative cooling equipment are indicated in the tables below: Model Operating Height (measured from pan bottom) (mm) To check the operating level, proceed as follows: 1.
  • Page 17 Water Make-up Valve Assembly 1. Float Ball 2. All Threaded Rod 3. Wing Nuts 4. Float Arm Assembly 5. Float Valve Caution SUPPLY PRESSURE FOR MECHANICAL MAKE-UP VALVES SHOULD BE BETWEEN 1 AND 4,5 BAR. To make the initial basin water level setting, fill the sump with water until 2 cm above operating level. Adjust the wing nuts of the float ball so, that the make-up valve is completely closed.
  • Page 18 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 19 Belt Tension Forces New belts have to be re-tensioned after 24 hours operation. If belt tensioning is required, please proceed as follows: 1. Loosen the lock nuts on the Motor Base Adjusting Screws. 2. Turn the Motor Base Adjusting Screws clockwise to tension the belt, or counter-clockwise to relieve belt tension.
  • Page 20 Locking Collar Assembly 1. Direction of Rotation 2. Drift Pin: Tap the locking collar in direction of fan rotation until cam is locked. 3. Tighten set screw. ROTATION OF FAN(S) AND PUMP(S) Fans must rotate without obstruction and both fans and pumps must rotate in the correct direction, which is indicated by arrows on the equipment.

  • Page 21: 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 22 Remove any obstructions from heat transfer section(s). Any damages or corroded areas need to be repaired. Call your local BAC Balticare representative for assistance. Minor fouling can usually be removed chemically or by temporary changes to the water treatment programme.
  • Page 23 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 24: 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 25: Cleaning Procedures

    ADJUSTABLE MOTOR BASE The motor base adjusting screw (see figure below) should be coated every six months using a good quality corrosion inhibiting grease, such as one of those recommended for lubricating the fan shaft bearings. Adjustable Motor Base 1. Motor Base Slide 2.
  • Page 26 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 27: Comprehensive Maintenance

    Remove and store fan belts and access door gaskets. • Hot dip galvanized coils of BAC condensers 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 28: Further Assistance & Information

    For more details, contact BAC Balticare at www.balticare.com or you can also contact your local BAC representative for further information and specific assistance at www.BaltimoreAircoil.eu.
  • Page 29 W W W . B A L T I M O R E A I R C O I L . E U...
  • Page 30 W W W . B A L T I M O R E A I R C O I L . E U...
  • Page 31 W W W . B A L T I M O R E A I R C O I L . E U...
  • Page 32 COOLING TOWERS CLOSED CIRCUIT COOLING TOWERS ICE THERMAL STORAGE EVAPORATIVE CONDENSERS HYBRID PRODUCTS PARTS & SERVICES www.BaltimoreAircoil.eu info@BaltimoreAircoil.eu www.balticare.com info@balticare.com 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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