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Table of Contents
Related Manuals for BAC PT2
Summary of Contents for BAC PT2
- Page 1 PT2 Cooling Tower OPERATION & MAINTENANCE MANUAL...
- Page 2 Recommended Maintenance Intervals Inspect and clean as necessary: Start-Up Monthly Quarterly Annually Shutdown Inspect general condition of the tower 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 Verify combined inlet retainers are compressed Check and adjust water level in basin(s)
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Page 3: Table Of Contents
Table of Contents OPERATION & MAINTENANCE » PT2 COOLING TOWER Safety and Equipment Precautions PART 4 Bleed Rate Safety Precautions Bleed Rate Equipment Precautions PART 5 Cold Weather Operation General Maintenance Information Inspection & Maintenance Warranties Fan Section Icing Protection... -
Page 4: Safety Precautions
“critical speed” which could result in fan failure and possible personal injury or damage. Contact your local BAC Representative regarding any such applications. • WARNING: The recirculating water system may contain chemicals or biological contaminants, including Legionella, which could be harmful if inhaled or ingested. -
Page 5: Equipment Precautions
NOTICE • 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. See “Prolonged Outdoor Storage” on page 7 for more details.. -
Page 6: Unit Operation And Storage
Make-up Valve Adjustment Float Cold Water Basin Water Outlet with Strainer Figure 1. PT2 Cooling Tower Start-Up Procedure Considerations for Initial Start-Up • For units with independent fan control, see page 30. • For units with VFDs, see page 30. - Page 7 • Except for the PT2-0412, prior to seasonal start-up, check and adjust the belt tension. Prior to the initial start-up, the belt tension may not require adjustment as the motors are disconnected, locked drive will be properly tensioned at the factory prior to shipment.
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Page 8: Extended Shutdown
• Execute one of the following biocide treatment programs while operating the circulating pump and prior to operating the unit fan(s): – Resume treatment with the biocide that was used prior to shutdown. Operate the pump only while maintaining the maximum recommended biocide residual for a sufficient duration (residual and time will vary with the biocide) as recommended by the water treatment supplier. -
Page 9: Prolonged Outdoor Storage
• Clean the basin strainer and re-install. Start-Up Procedure • Cover the fan discharge to keep out dirt and debris. Start-Up • Except for the PT2-0412, lubricate the fan shaft bearings, motor base, and motor Extended Shutdown base adjusting screw. • Apply RUST VETO to steel shafts and bushings. - Page 10 Request the required voltage and transformer capacity from maintenance or inspection on or your local BAC Representative. A third option is to use an auxiliary heat source and near the fans, motors, and drives, keep the winding warm by either convection or blowing warm air into the motor.
- Page 11 Rigging and Assembly Instructions, available on www.BaltimoreAircoil.com or by ensuring that the fan and pump contacting your local BAC Representative. motors are disconnected, locked • Perform an insulation test of motor windings to ensure satisfactory insulation out, and tagged out.
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Page 12: Detailed Component Maintenance Procedures
Corrosion Protection System ® • Welded Type 304 stainless steel Water Levels Model Number At Overflow Level (in.) At Operating Level (in.) PT2-0412, PT2-0709, PT2-O809, PT2-1009, 10 1/2” 6 5/8” PT2-1012, and PT2-1212 PT2-0814 and PT2-1214 11” 6 5/8” PT2-1218 12 1/4”... -
Page 13: Fan
Use caution when walking inside this equipment. The PT2 Cooling Tower uses axial fan(s). Thoroughly inspect the fan(s) for damaged or deteriorated fan blades and replace the fan(s) as required. Inspection & Maintenance •... -
Page 14: Fan Drive System
Fan Drive System Model Specific Fan Drive System Descriptions Direct Drive Motor [Model PT2-0412]: Factory mounted direct drive system with premium efficiency totally enclosed motors (Figure 2a). Externally Mounted Motor [Models PT2-0709, PT2-0809, PT2-0812, and PT2-0814]: A BALTIDRIVE Power Train belt drive system with a premium efficiency totally enclosed ®... - Page 15 • Belt tension check: Detailed Component – Place a straight edge along the belt from sheave to sheave as shown in Figure 3a, or Maintenance use a tape measure as shown in Figure 3b to measure belt deflection. Procedures – Apply a moderate force by hand (approximately 40 lbs/178 N) evenly across the width of the belt in the center of the span between the sheaves.
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Page 16: Fan Motors
Use good quality, corrosion inhibiting grease such as one of those recommended for lubricating the fan shaft bearings on page 15, or Anti-Seize (BAC part # 160069). WWW. B A LT IM ORE A IRCOIL.COM... -
Page 17: Fan Shaft Bearings
Inspection & Maintenance Adjustable Motor Base Fan Shaft Bearings • Only lubricate the bearings with a manual grease gun or BAC’s optional Automatic Bearing Greaser. Do not use high-pressure grease guns because they may rupture the Inspection & Maintenance bearing seals. -
Page 18: Water Distribution And Heat Transfer Section
There are two types of water level controls used on BAC Cooling Towers: tools. Misuse can result in physical • Mechanical make-up valve assembly injury and/or equipment damage. - Page 19 • With the design thermal load and the average water pressure (15 to 50 psig) at the valve, the above setting will produce operating water levels as stated in Table 1 on page 10. Detailed Component • If the thermal load is less than the design load at the time of unit start-up, the Maintenance procedure may produce operating levels greater than those shown in Table 1.
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Page 20: Corrosion Protection
• Thermosetting Hybrid Polymer Components: Inspect components protected with the thermosetting hybrid polymer for scratches, scrapes or blemishes. To touch up these areas use a repair kit (BAC Part # 160133) available from your local BAC Representative. • Stainless Steel Components: Inspect stainless steel components for signs of blemishes or corrosion. -
Page 21: Corrosion And Scale Control
Corrosion Protection • Scale Formation – Scale, typically a calcium or magnesium based build-up, not only reduces heat transfer and system efficiency, but also may lead to under deposit Water Treatment corrosion. If scale is not controlled, it may continue building on critical components such as the fill and severely impact thermal performance. -
Page 22: Chemical Treatment Requirements
• The chemicals must be compatible with the unit materials of construction as well as other materials used in the system (pipe, heat exchanger, etc.). • BAC discourages acid dosing as means of scale control except for open circuit cooling towers with remote sump applications or towers constructed from stainless steel. This should be done at a point in the system where total mixing and dilution occur before reaching the evaporative cooling equipment. -
Page 23: Long Term Care Of Stainless Steel
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. - Page 24 • If the iron chips are not removed with the Scotch-Brite™ Products, electro-chemical NOTE: Long term care of stainless cleaning may be required. BAC uses commercially available equipment for electro- chemical cleaning in the field. Contact your local BAC Representative for more steel information reprinted with information.
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Page 25: Part 4 Bleed Rate
The evaporation rate is dependent on the wet bulb temperature and load. The equation tons of refrigeration. shown above provides the maximum bleed rate on the design day. Contact your local BAC • Evaporation Rate = representative for an exact calculation based on specific site conditions. -
Page 26: Cold Weather Operation
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. • Ensure all controls for capacity and freeze protection are set properly and functioning normally. -
Page 27: Basin Water And Internal Piping Freeze Protection
The two-position, slow closing solenoid valve provided with the BAC electric make-up connection. water level control package also minimizes valve freezing problems (see page 17). -
Page 28: Operation Considerations For Accessories
De-energize, lock out and tag out power to the basin heater prior to draining the cold water basin. For installations that have a BAC Controls Enclosure, please consult the NOTICE: The basin heater is not submittal packet provided with the unit and... - Page 29 (4.5°C), but will not energize if the water level is too low or if the water temperature is Basin Heater above 45°F (7.2°C). Stand Alone BAC Heater Control Testing the heater when water temperatures are above 45°F (7.2°C): Panel • Disconnect the heater control panel and lock out/tag out the circuit.
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Page 30: Vibration Cutout Switch (Vcos)
(If Required) Immersion Heaters Figure 8. Example Wiring Diagram for Stand Alone BAC Heater Control Panel (Refer to Submittal Drawing for Specific Wiring Diagram) Vibration Cutout Switch (VCOS) The Mechanical Vibration Cutout Switch and the Optional Electronic Vibration Cutout NOTE: If the VCOS trips, turn off, Switch should be tested and field adjusted at start-up and yearly thereafter. - Page 31 Accessories model contains one trip limit for shutdown. The dual set point model contains two independent trip limits; one for alarm and one for shutdown. The shutdown set-point is Stand Alone BAC Heater Control factory set at Panel 0.45 in/sec. Additional details can be found in the submittal packet.
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Page 32: Fan Control
See page 31 for details. • Please refer to the manufacturer’s variable frequency drive recommended start-up procedure for further information or consult with your local BAC Representative for any VFD applications. For projects with BAC controls, visit www.BaltimoreAircoil.com. WWW. B A LT IM ORE A IRCOIL.COM... -
Page 33: Resonant Speed Identification Procedure
Fan Control Resonant Speed Identification Procedure Independent Fan Control Variable Frequency Drive There are several characteristic frequencies at which vibration levels may resonate with Operation 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 Resonant Speed for one or more of these characteristic frequencies to excite the structural components Identification Procedure... - Page 34 • As stated previously, when adjusting the VFD speed, proceed slowly while monitoring 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 occurs as the lower end of the lock out range.
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Page 35: Installation Instructions
Table 4. 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 36 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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