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Summary of Contents for BAC 3240C
- Page 1 Series 3000 Cooling Tower OPERATION & MAINTENANCE MANUAL...
- Page 2 Check fan for uniform pitch Check fan for rotation without obstruction Check and recoat steel shafts with RUST VETO ® Check optional basin heater and stand alone BAC heater control panel Check optional vibration cutout switch DANGER: Do not perform any NOTES: service on or near the fans, 1.
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Page 3: Table Of Contents
Extended Shutdown Basin Heater (Optional) Prolonged Outdoor Storage Vibration Cutout Switch (VCOS) PART 2 Detailed Component Maintenance Procedures Stand Alone BAC Heater Control Panel (Optional) Part 7 Fan Control Cold Water Basin Variable Frequency Drive Operation Fan Drive System Resonant Speed Identification Procedure... -
Page 4: Safety And Equipment Precautions
Safety and Equipment Precautions Danger • DANGER: 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 •... -
Page 5: Attention
Please contact your local BAC Representative for replacement parts. • For the stand alone BAC heater control panel, do not operate the system unattended or for extended periods of time during test mode (resistor across terminals T1 and T2). Operation in water temperatures above 45°F (7.2°C) could damage the unit. -
Page 6: Unit Operation And Storage
SERIES 3000 COOLING TOWER Unit Operation and Storage Fan Guard BALTIDRIVE ® Top Water Inlet Power Train Fan Deck Hot Water Basin and Cover Casing Air Intake Louvers Make-up Valve Adjustable Float Water Outlet Cold Water Connection Basin BACross Fill with ®... - Page 7 • For the top inlets only, adjust the flow balancing valves to equalize flow to the hot water basin(s). This valve may be provided by others or optionally supplied by BAC. • Series 3000 Cooling Towers equipped with the optional EASY CONNECT Piping ®...
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Page 8: Extended Shutdown
• Adjust the valve (supplied by others) in the tower bleed line to achieve the desired bleed rate by closing or opening the valve. ATTENTION: Check to ensure the • Inspect the nozzles and heat transfer section as described in “Water Distribution controls for the fan motor are set System”... -
Page 9: Prolonged Outdoor Storage
• Remove and store fan belts (if supplied) at room temperature. Tag belts appropriately for future identification. • Apply a weather-resistant lubricant or heavy grease such as Anti-Seize (BAC Part # 160069) to all exposed threaded or flanged connections and adjustable motor base threaded rod. - Page 10 Request the required voltage and transformer capacity from your local BAC Representative. A third option is to use an auxiliary heat source and keep the winding warm by either convection or blowing warm air into the motor.
- Page 11 9 3/4 31213C, 31301C 20 1/2 9 3/4 levels. If the connection size is 3672C custom, contact your local BAC 3728C, 3781C, 3828C, 18 1/2 9 3/4 representative. 3871C Table 1. Cold Water Basin Water Levels (Measured From Inside the Cold Water Basin) •...
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Page 12: Fan
– Check each blade for any cracks. If cracks are found, the fan motor should be locked out until the fan is replaced. Contact your local BAC Representative for assistance. – Whisper Quiet Fan Only: The blades shall be inspected at regular intervals, a ATTENTION: Neglected damaged minimum of once every month, for deposits and damage. -
Page 13: Fan Drive System
Detailed Component during operation. Contact your local BAC Representative if there are any concerns. Maintenance • Drain Holes: On hollow blades, the drain hole in the blade tip should be unobstructed. - Page 14 • Belt tension check: – Place a straight edge along the belt from sheave to sheave as shown in Figure 3a, or NOTE: If belts are properly use a tape measure as shown in Figure 3b to measure belt deflection. tensioned, there should be no –...
- Page 15 Fan Drive System • BAC ships all gear drives filled with oil. The initial oil level should be at or near the BALTIDRIVE Power Train/ ®...
- Page 16 • Check to ensure that all bolts and external fasteners are tight. • BAC recommends daily visual inspections and observation for oil leaks and unusual noises and vibrations. If any of these occur, shutdown the unit until the cause is found and corrected.
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Page 17: Maintenance Procedures
Contact – Mobil Oil – SHC 630 your local BAC Representative prior • When the ambient temperature exceeds 180°F (82°C) or the gear drive is started at an ambient temperature less than 20°F (-7°C), a synthetic lubricant is recommended. - Page 18 Gear Model for Model Number Low Sound Gear Model for Standard Fan (Motor HP) Standard Fan Fan (Motor HP) Standard Fan 3240C (7.5,10) 3240C (7.5,10) 3272C (15) 3272C (15) NOTE: For projects with whisper 3299C (20) 3299C (20) 3333C (7.5,10,15) 3333C (7.5,10,15,20)
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Page 19: Fan Motors
Inspection & Maintenance • Only lubricate the bearings with a manual grease gun or BAC’s optional Automatic NOTE: For programming, operation, Bearing Greaser. Do not use high-pressure grease guns since they may rupture the and trouble shooting of the greaser, bearing seals. -
Page 20: Heat Transfer Section
• 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 or more than three months, both bearings should be lubricated with new grease before initial operation. -
Page 21: Water Level Control
Operating Level Detailed Component At design flow, the operating level should not be less than 2 inches or greater than 6 Maintenance inches deep. Procedures Fan Shaft Bearings Inspection and Maintenance Inspection & Maintenance • Quarterly, or more often as required, remove any dirt or debris which may clog the Heat Transfer System nozzles. - Page 22 • Inspect the valve annually for leakage. Replace the valve seat if necessary. • Maintain the make-up water supply pressure between 15 psig and 50 psig for proper operation. BAC recommends a pressure regulator valve (provided by others) for pressures over 50 psig.
- Page 23 L.E.D. Status Codes Detailed Component • L.E.D. on steady: Indicates normal operation. Maintenance • Steady one second flashing: Indicates dirty probes, reading in the capacitance Procedures mode. The unit will still operate but will give the following status code of 1 second on, 1 second off (steady 1 second flashing).
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Page 24: Corrosion Protection
SERIES 3000 COOLING TOWER Corrosion Protection BAC products are constructed of corrosion-resistant materials. The fill is made of a polyvinyl chloride (PVC), which requires no protection against rot, decay, rust or biological attack. Other materials listed below are used in the equipment construction: •... -
Page 25: Corrosion And Scale Control
• Corrosion – Red rust on steel components and white rust on galvanized surfaces may Corrosion Protection affect the longevity of system components. • Scale Formation – Scale not only reduces heat transfer and system efficiency, but Water Treatment also may lead to under deposit corrosion. If scale is not controlled, it may continue building on critical components such as the fill and severely impact thermal Corrosion and Scale Control performance. -
Page 26: Chemical Treatment Requirements
• 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. -
Page 27: Long Term Care Of Stainless Steel
• 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- WW W. BALTIMOR EAIRC O IL. C OM chemical cleaning in the field. Contact your local BAC Representative for more information or to arrange a service call. -
Page 28: Part 4 Bleed Rate
Evaporation is proportional to the load and will vary seasonally. BAC recommends the use of a conductivity meter to maximize water conservation. WWW. B A LT IMORE A IRCOIL.COM... -
Page 29: Bleed Rate
NOTE: Evaporation is proportional E = Q * R * 0.001 = 800 * 10 * 0.001 = 8 USGPM to the load and will vary seasonally. BAC recommends the use of a = 250 ppm = 5.55 conductivity meter to maximize 45 ppm water conservation. -
Page 30: Cold Weather Operation
SERIES 3000 COOLING TOWER Cold Weather Operation Inspection & Maintenance BAC products can be operated at subfreezing ambient temperatures provided proper operating methods are established and diligently followed. • Carry out frequent visual inspections and routine maintenance services during operation in subfreezing weather. -
Page 31: Basin Water And Internal Piping Freeze Protection
The two-position, slow closing solenoid valve provided with the BAC electric cooling tower and the remote sump. water level control package also minimizes valve freezing problems (see page 20). -
Page 32: Freeze Protection For The Optional Easy Connect ® Piping Arrangement
Freeze Protection for the Optional EASY CONNECT Piping Arrangement ® • Eliminate all water in the optional EASY CONNECT Piping Arrangement and in all ® internal piping when the tower is idle. Figure 7. Optional EASY CONNECT Piping Arrangement ® •... -
Page 33: Operation Considerations For Accessories
Ensure that the heating element is completely Figure 8. Basin Heater submerged before energizing the main disconnect. ATTENTION: The basin heater is not For installations that have a BAC Controls Enclosure, designed to prevent icing during please consult the submittal package provided with unit operation. -
Page 34: Vibration Cutout Switch (Vcos)
6. If the VCOS trips, repeat steps 1 through 5 until calibration is complete. level sensor probe. Please contact Electrical Reset and Start-up Lockout (Optional): your local BAC Representative for 1. If rated voltage is continuously applied to the reset circuit at unit start-up, the reset replacement parts. -
Page 35: Stand Alone Bac Heater Control Panel (Optional)
Operation Considerations Stand Alone BAC Heater Control Panel (Optional) for Accessories Vibration Cutout Switch (VCOS) Mechanical VCOS The heater control system consists of a heater control panel and a combination Electronic VCOS temperature/water level sensor. The stainless steel sensor probe with 1/2” NPT mounting... - Page 36 Control Panel (If Required) Immersion Heaters Figure 10. Example Wiring Diagram for Stand Alone BAC Heater Control Panel (Refer to Submittal Drawing for Specific Wiring Diagram) NOTE: Figure 10 is superseded by any drawing supplied with the panel by the manufacturer.
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Page 37: Fan Control
• Please refer to the manufacturer’s variable frequency drive recommended start-up recommended to protect the motor. procedure for further information or consult with your local BAC Representative for any Since the switching frequency and VFD applications. For projects with BAC controls, visit www.BaltimoreAircoil.com. -
Page 38: Resonant Speed Identification Procedure
Resonant Speed Identification Procedure There are several characteristic frequencies at which vibration levels may resonate with unit structural components. These include fan speed, motor speed, bearing frequency, and blade pass frequency. Within the overall operating speed range of a unit, it is not unusual for one or more of these characteristic frequencies to excite the structural components over relatively small speed ranges and create an increase in vibration levels. - Page 39 • As stated previously, when adjusting the VFD speed, proceed slowly while monitoring Fan Control the vibration levels. If the vibration value approaches 0.35 ips (0-peak), slowly “zero in” on the speed where the value equals 0.35 ips, and record the speed at which this Resonant Speed occurs as the lower end of the lockout range.
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Page 40: Part 8 New Field Connections For Triarmor
Table 6. Supplies for Installing Field Connections connections. Please order the 1. Use the BAC template provided with the accessory to layout and mark the hole pattern recommended supplies listed in on the exterior of the cold water basin. - Page 41 • Basin heater and low water cut out Tower Parts are shipped second day and • Door gasket carry a full 1-year warranty backed by BAC. • Strainer (inlet and suction) To purchase parts online, visit • Fan and sheave bushings www.CoolingTowerWorld.com today.
- Page 42 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 7600 Dorsey Run Road, Jessup, MD 20794 ›...
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