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Table of Contents
Related Manuals for SPX Marley NC Series
Summary of Contents for SPX Marley NC Series
- Page 1 U S E R M A N UA L steel cooling tower ® I N S TA L L AT I O N - O P E R AT I O N - M A I N T E N A N C E R EAD AN D U N D E R STAN D TH I S MAN UAL PR IOR TO OPE RATI NG OR S E RVICI NG TH I S PROD UCT.
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Page 2: Table Of Contents
contents This manual contains vital information for the proper installation and Note operation of your cooling tower. Carefully read the manual before installation or operation of the tower and follow all instructions. Save this manual for future reference. Overview ........................3 Tower Location ......................5 Tower Shipment......................5 Receiving Tower ......................5... -
Page 3: Overview
Any such deviation, change or modification shall be the responsibility of the party or parties making such deviation, change or modification. SPX Cooling Technologies, Inc. expressly disclaims all liability for any such deviation, change or modification. -
Page 4: Tower Location
Those are only some of the safety issues that may arise in the design process. SPX strongly recommends that you consult a safety engineer to be sure that all safety considerations have been addressed. -
Page 5: Tower Shipment
receiving and hoisting Tower Shipment Unless otherwise specified, NC towers ship by truck (on flat bed trailers), which lets you receive, hoist, and install the tower in one continuous operation. Single-cell towers ship on one truck. Multicell towers, depending on their size, may require more than one truck. -
Page 6: Tower Installation
installation Tower Installation These installation instructions are intended to help you prepare Note before your tower arrives. If discrepancies exist between these instructions and those shipped with the tower, the instructions shipped with the tower will govern. 1. Prior to placement of the tower, confirm that the supporting platform is level, and that the anchor bolt holes are correctly located in accordance with Marley drawings. - Page 7 installation 7. Repeat steps 2 and 3 for 2nd top section on NC8411 through NC8414 models. 8. Repeat steps 4 through 7 for any remaining cells. 9. Attach your cold water supply piping to the cold water basin outlet connec- tion in accordance with drawing instructions, utilizing gaskets provided.
- Page 8 Bolt circle is designed to accept a standard 125# flat-face flange. 12. Wire motor in accordance with wiring diagram. For maintenance/safety purposes, SPX recommends a lockout Warning type disconnect switch for all mechanical equipment. In addition...
- Page 9 installation Motor Wiring Wire motor leads as shown on the motor nameplate matching the supply voltage. Do not deviate from the motor nameplate wiring. Either of following symbols may be shown on the motor nameplate – Δ, Δ Δ, , or .
- Page 10 VFD drive system. The length of this warranty avoidance will be contingent on properly installing the VFD system and repairing any damage that may have occurred during its operation. SPX Cool- ing Technologies does not assume responsibility for any technical support or damages for problems associate with non-Marley brand VFD systems.
- Page 11 installation Mechanical Equipment: Always shut off electrical power to the tower fan motor prior to Warning performing any maintenance on the tower. Any electrical switches should be locked out and tagged out to prevent others from turning the power back on. 1. If equipped, check oil level in accordance with the Geareducer User Manual for the Geareducer.
- Page 12 installation 4. Momentarily bump (energize) the motor and observe rotation of the fan. The fan should rotate in a counterclockwise direction when viewed from below. If rotation is backwards, shut off the fan and reverse two of the three primary leads supplying power to the motor. If tower is equipped with a two-speed motor, check for proper rota- Caution tion at both speeds. Check also to see that starter is equipped with a...
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Page 13: Tower Start-Up
installation Tower Start-Up Among other sources, outbreaks of Legionnaires’ Disease have Warning reportedly been traced to cooling towers. Maintenance and water treatment procedures that prevent amplification and dissemination of Legionella and other airborne bacteria should be formulated and implemented BEFORE systems are operated and continued regularly thereafter to avoid the risk of sickness or death. Water System: 1. - Page 14 installation Some trial and error adjustment of the float valve may be required to balance the makeup water with tower operation. Ideally, the float valve setting will be such that no water is wasted through the overflow at pump shutdown. However, the water level after pump start-up must be deep enough to assure positive pump suction.
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Page 15: Tower Operation
operation After biocidal pretreatment has been successfully completed, cooling water may be circulated over the tower fill with the fan off. When biocidal treatment has been maintained at a satisfactory level for at least six hours, the fan may be turned on and the system returned to service. - Page 16 operation 4. Air flow rate: Reducing air flow through the tower causes the cold water temperature to rise. This is the approved method by which to control leaving water temperature. If your tower is equipped with a single-speed motor, the motor may be shut off when the water temperature becomes too cold.
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Page 17: Wintertime Operation
operation Wintertime Operation: The Marley fill system used in NC cooling towers has air entrance louvers that are molded as an integral part of the fill. This feature makes these towers very forgiving of cold weather operation, even at the low temperature and reduced load conditions encountered in free cooling and other low temperature applica- tions. - Page 18 If a bypass is used, all water must be bypassed without modulation. If the water bypass is directly into the tower's cold water basin, its design must be approved by SPX Cooling Technologies.
- Page 19 operation Intermittent Wintertime Operation: If periods of shutdown (nights, weekends, etc.) occur during freezing Caution weather, measures must be taken to prevent the water in the cold water basin—and all exposed piping, both internally and externally— from freezing. Several methods are used to combat this, including: —automatic water basin heater systems available from Marley. —field installation of heat tracing of piping, both internally and externally. — field modification to provide a weep hole by drilling a ⁄...
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Page 20: Water Treatment And Blowdown
operation Water Treatment and Blowdown Maintaining Water Quality: The steel used in NC towers has been galvanized with a heavy zinc coating averaging 2.0 mils in thickness. The NC stainless steel option is even more corrosion resistant than galvanized steel in certain environments. Other ma- terials used (PVC fill, drift eliminators, and louvers, aluminum fans, cast iron Geareducer, etc.) are selected to offer maximum service life in a “normal”... -
Page 21: Cooling Tower Cleaning
maintenance Cooling Tower Cleaning: Any evaporative-type cooling tower must be thoroughly cleaned on Warning a regular basis to minimize the growth of bacteria, including Legio- nella Pneumophila, to avoid the risk of sickness or death. Service personnel must wear proper personal protective equipment during decontamination. Do NOT attempt any service unless the fan motor is locked out. Operators of evaporative cooling equipment, such as water cooling towers, should follow maintenance programs which will reduce to an absolute minimum the opportunity for bacteriological contamination. - Page 22 maintenance the minimum amount of blowdown (percent of flow) required to maintain different concentrations with various cooling ranges*: Number of Concentrations Cooling Range 1.5X 2.0X 2.5X 3.0X 4.0X 5.0X 6.0X 5º F 10º F 1.58 15º F 2.38 1.18 20º F 3.18 1.58 1.05...
- Page 23 maintenance Sheave Alignment • The motor sheave is to be positioned as close as possible to the motor in order to minimize torque on the motor bushings. • The motor and fan sheaves may have grooves that are not used. The bottom surface of the motor and fan sheaves must be aligned within ⁄ " of each other and level within ⁄ ° ( ⁄ " in 12) in order to not adversely affect belt and sheave life.
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Page 24: Schedule Of Tower Maintenance
maintenance Schedule of Tower Maintenance Some maintenance procedures may require maintenance personnel to enter the tower. Each cased face of the tower has a door for access to the interior of the tower. The NC8401 and NC8402 have a 30" wide by 33" high door. All other models have a 30"... - Page 25 maintenance fan. Become familiar with the normal operating temperature of the motor, as well as the sight and sound of all components as a whole. If equipped, check for Geareducer oil leaks. Check the Geareducer as well as any optional oil lines to external oil dipstick/sight glass. Inspect louvers, drift eliminators and basin trash screens and remove any debris or scale which may have accumulated.
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Page 26: Motor Relubrication Instructions
maintenance Relubricate motor according to the manufacturer’s instructions. Refer to the Motor Re-lubrication Instructions of this manual for towers equipped with the motor outside the plenum area. Check to see that all bolts are tight in the fan and mechanical equipment region, including the fan cylinder and fan guard. -
Page 27: Seasonal Shutdown Instructions
maintenance 5. Reinstall grease relief plugs and reinstall guard. 6. Resume normal tower operation. Seasonal Shutdown Instructions When the system is to be shut down for an extended period of time, it is recommended that the entire system (cooling tower, system piping, heat exchangers, etc.) be drained. -
Page 28: Prolonged Shutdown
Be sure to mention your tower serial number (from the tower nameplate) when ordering parts. Periodic maintenance: You may wish to contract with SPX for regularly scheduled visits—for the purpose of inspecting and reporting your tower’s condition—to make recommendations intended to prevent emergencies— and to perform maintenance considered outside the norm. -
Page 29: Maintenance Schedule
maintenance schedule Maintenance Service Monthly Semi-annually Seasonal Startup or Annually Inspect General Condition and Operation Observe Operation of: Mechanical–motor, fan and drive mechanism Makeup valve (if equipped) Inspect for unusual noise or vibration Inspect and Clean: Air inlet PVC drift eliminators Distribution basin, nozzles and collection basin Fan motor exterior Check:... -
Page 30: Troubleshooting
troubleshooting Trouble Cause Remedy Check power at starter. Correct any bad connections between the control apparatus and the motor. Power not available at motor Check starter contacts and control circuit. Reset overloads, close terminals contacts, reset tripped switches or replace failed control switches. If power is not on all leads at starter, make sure overload and short circuit devices are in proper condition. - Page 31 troubleshooting Trouble Cause Remedy If new, see if noise disappears after one week of operation. Drain, flush Geareducer bearings and refill Geareducer oil. See Geareducer User Manual. If still noisy, replace. Geareducer noise Correct tooth engagement. Replace badly worn gears. Replace gears Gears with broken or damaged teeth Tighten all bolts and cap screws on all mechanical equipment and...
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Page 32: Additional Information
If your tower ever reaches the limit of its service life, we recommend In addition to these specific documents, SPX pub- that you investigate the cost of rebuilding before lishes numerous technical reports including more you routinely order a new replacement tower.
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