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

Evaporative condensers
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MVCLv19EN
VCL Evaporative Condensers
OPERATING AND MAINTENANCE INSTRUCTIONS

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Summary of Contents for BAC VCL Series

  • Page 1 MVCLv19EN 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 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 Monthly Quarterly Every 6 Annually Shutdown months...

  • 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. 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. Man size access door 1 Construction Details 1 Construction Details W W W .

  • Page 6: General Information

    All connections (installed by others) must be leak free and tested accordingly. To verify absence of non condensables in the refrigeration system, follow the instructions in the BAC Application Handbook – EU Edition (https://www.baltimoreaircoil.eu/downloads/pdf-Application-Handbook-EU-Edition), Section "Condenser Engineering Guidelines".

  • 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. 2 General information 2 General information...

  • Page 8: 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 9: 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 10: 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 11 ® 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 12 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 13: 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 14: 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 15: 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 16 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 17: 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 18 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 3. Pan bottom Operating heights for the evaporative cooling equipment are indicated in the tables below: Model Operating height (measured from pan bottom)
  • Page 19 Water make-up valve assembly 1. Float ball 2. Float arm assembly 3. Float valve CAUTION Supply pressure for mechanical make-up valves should be between 1 and 3,5 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 20 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 21 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 22 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...

  • Page 23: 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 24 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 25 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 26: 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 27: 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 28 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 29: Comprehensive Maintenance

    Remove and store fan belts and access door gaskets. • Hot dip galvanized and stainless steel 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 30: 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 31 W W W . B A L T I M O R E A I R C O I L . E U...
  • Page 32 W W W . B A L T I M O R E A I R C O I L . E U...
  • 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 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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