SPX Cooling Technologies MH Fluid Cooler User Manual
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SPX Cooling Technologies MH Fluid Cooler User Manual

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U S E R M A N UA L
MH Fluid Cooler
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
u k _ Z 0 8 7 6 1 7 6 r e v A
I S S U E D 1 0 / 2 0 1 4
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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Summary of Contents for SPX Cooling Technologies MH Fluid Cooler

  • Page 1 U S E R M A N UA L MH Fluid Cooler 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...

  • Page 2: Table Of Contents

    contents This manual contains vital information for the proper installation Note and operation of your fluid cooler. Carefully read the manual before installation or operation of the fluid cooler and follow all instruc- tions. Save this manual for future reference. Fluid Cooler Location ........................

  • Page 3: Safety First

    The Marley MH Fluid Cooler purchased for this installation represents the cur- rent state of the art in crossflow, induced draft fluid cooler design. Thermally and operationally, it is one of the most efficient fluid cooler of its class.

  • Page 4: Fluid Cooler Location

    preparation It is not intended nor assumed that access to the fan deck on single- Note flow models—Models MHF7103 thru MHF7107 and MHF705—is needed or necessary. Those are only some of the safety issues that may arise in the design process. SPX strongly recommends that you consult a safety engi- neer to be sure that all safety considerations have been addressed. Several options are available that may assist you in addressing some of these personnel safety concerns, including: •...

  • Page 5: Fluid Cooler Shipment

    Hoisting Fluid Cooler All MH Fluid Cooler models must use hoist clips and overhead lifting for handling assembled fluid cooler. Fork lifting from base of fluid cooler is not permitted. The clips for the top modules are located at the fan deck level.

  • Page 6: Fluid Cooler Installation

    installation Hoisting clips are provided for ease of unloading and positioning Warning the fluid cooler. For overhead lifts or where additional safety is required, safety slings should also be placed under the fluid cooler modules. Under no circumstances should you combine the top and bottom modules of modular models and attempt to hoist them at the same time by utilizing the hoisting clips alone! OFFSET REQUIRED FOR BALANCED LIFT...
  • Page 7 installation 3. Before setting top module in place on bottom module, clean any debris from the underside of the top module fill, skid and beams and from the top of the bottom module and remove shipping cover from bottom of top module—replace fasteners at side of module to prevent leaks.

  • Page 8: Motor Wiring

    installation Threaded connection: The coil piping connections are fitted with male threads of a specified thread type — most commonly NPT or BSP, depending on location of installation. Copper Soldered connection: The piping connections are pipe stubs for field soldering. Flanged connection: The coil piping connections are designed for flat- face flange fittings conforming to 125# ANSI B16.1 specifications and are field installed (by others).
  • Page 9 installation When using a two-speed starter: • Motor rotation must be the same at slow speed and high speed. • Single winding motor requires a starter with a shorting contactor. • Two-winding motor requires a starter with out a shorting contactor. • All two-speed starters must have a 20 second time delay relay when switching from high speed to low speed. Do not start the motor more than four to five times per hour (each Note low speed start and each high speed start count as one start). When using a VFD: Before beginning, ensure that the motor is rated for “Inverter Duty”...

  • Page 10: Mechanical Equipment

    installation avoided by purchasing Marley drive systems. If you are installing a VFD other than a Marley drive, please refer to that drives installation manual. Improper use of a VFD may cause damage to equipment or personal Warning injury. Failure to correctly install the VFD drive will automatically void all warranties associated with the motor and any equipment that is either electrically or mechanically (directly) attached to the VFD drive system.
  • Page 11 installation Improper installation of the fan cylinder and fan guard will destroy Warning the structural integrity of the fan guard. Failure of the fan guard could allow operating or maintenance personnel to fall into the rotating fan. 3. Spin the fan(s) manually to assure that all fan blades properly clear the inside of the fan cylinder.

  • Page 12: Fluid Cooler Start-Up

    operation Fluid Cooler Start-Up Among other sources, outbreaks of Legionnaires’ Disease have Warning reportedly been traced to cooling towers and fluid coolers. Main- tenance 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.
  • Page 13 operation Some trial and error adjustment of the float valve may be required to bal- ance the makeup water with fluid cooler operation. Ideally, the float valve setting will be such that no water is wasted through the overflow at pump shutdown.

  • Page 14: Fluid Cooler Operation

    operation Fluid Cooler Operation General: The cold process fluid temperature obtained from an operating fluid cooler will vary with the following influences: 1. Heat load: With the fan in full operation, if the heat load increases, the cold process fluid temperature will rise. If the heat load reduces, the cold process fluid temperature will reduce.
  • Page 15 operation Fan cycling limits: Considering the normal fan and motor sizes utilized on MH Fluid Note Coolers, anticipate that approximately 4 to 5 starts per hour are allowable. If your fluid cooler is equipped with a two-speed motor(s), you will have an opportunity for process temperature control. When the process fluid temperature becomes too cold, switching the fan to half-speed will cause the cold process fluid temperature to rise—stabilizing at a temperature a few degrees higher than before.

  • Page 16: Dry Cooling Operation

    operation If the dampers are equipped with an automatic electric actuator, Note the actuator electric motor controller will include a 200-volt AC space heater in accordance with the SPX Cooling specification. The space heater is to be energized at all times whether actuator motor is operating or not. The purpose of the energized space heater is to prevent moisture inside the unit from corroding the internal components.

  • Page 17: Freezing Weather Operation

    Freezing Weather Operation The Marley film-fill system used in the MH Fluid Cooler has air entrance louvers that are molded as an integral part of the fill. This feature makes these fluid coolers very forgiving of cold weather operation, even at the low temperature and reduced load conditions encountered in low temperature applications.
  • Page 18 operation Therefore, if excessive ice forms on the louvers, stop the fan for a few minutes. With the fan off, the water flow will increase in the vicinity of the louvers and reduce the ice buildup. 3. Under extended extreme cold conditions, it may be necessary to operate the fan in reverse.
  • Page 19 operation Protection Against Coil Freezing: Ethylene and propylene glycol solutions are the best means to protect the coil from freezing. The following table provides the coil volume for each MH Fluid Cooler model. MHF7111 and MHF7113 coil volumes are for both coils added together.

  • Page 20: Water Treatment And Blowdown

    maintenance Draining the coil is not acceptable as a normal method of freeze Caution protection—draining promotes corrosion inside the coil tubes. Draining is acceptable in an emergency if the coil is not protected by an antifreeze solution. It is recommended that you discuss your freeze prevention options with your local Marley sales representative.
  • Page 21 maintenance The structure and coil of your fluid cooler consists primarily of Note galvanized steel, therefore your water treatment program must be compatible with zinc. In working with your water treatment supplier, it is important that you recognize the potential effects on zinc of the specific treatment program you choose. Blowdown: A fluid cooler cools water by continuously causing a portion of it to evaporate.

  • Page 22: Fluid Cooler Cleaning

    maintenance When water treatment chemicals are added, they should not be Note introduced into the circulating water system via the water collec- tion basin of the fluid cooler. Water velocities are lowest at that point, which results in inadequate mixing. Ideal locations would be in the redistribution basin above the coil, or in the riser pipe above the discharge of the recirculating water pump(s).
  • Page 23 maintenance Louver edges can be very sharp and could cut skin if proper protec- Caution tion is not used. Always wear gloves and sleeves when handling eliminator packs. To remove the louvers, place both hands on the louver face and push up, this will indicate where one assembly stops and another starts. Push a single louver section up until it hits the top of the metal retaining channel (1).
  • Page 24 maintenance To remove the eliminators, place both hands on the eliminator face and push up, this will indicate where one assembly stops and another starts. Push a single section up until it hits the top of the metal retaining channel (1). Push the bottom side of the pack down inside the fluid cooler (2).

  • Page 25: Belt Tensioning

    maintenance Belt Tensioning Any bolts loosened or removed functioning as mechanical or struc- Caution tural hardware should be replaced with the torques specified below. Anti-seize compound is recommended for stainless steel hardware Fastener Torque Values Galvanized Stainless Machine Bolt ft·lb N·m ft·lb N·m Size ƒ ƒ 10mm 12mm 16mm 20mm See Figure 1 and Figure 2 for model MHF705.
  • Page 26 MOTOR SINGLE MOTOR—SINGLE FAN. MHF705 ONLY. See Figure 3 for MH Fluid Cooler models MHF7103 thru MHF7107 with a single motor per fan. Loosen specified hardware located at the top and bottom of the motor support assembly before adjusting the jacking screws. Do not remove the hardware—it is required to support the motor.
  • Page 27 See Figure 4 and Figure 5 for MH Fluid Cooler models MHF7103 thru MHF7107 for single motor with two fans. The belts are adjusted by turning the two acme bolts clockwise to tension the belts, keeping the motor plate square to the wall.
  • Page 28 maintenance FAN SHAFT BEARING HOUSING BELT SIDE GUSSET MOTOR Figure 5 SINGLE MOTOR—TWO FANS. MHF7103 THRU MHF 7107 ONLY. Ideal tension is the lowest tension at which the belt will not slip under peak load conditions. Check tension frequently during the first 24-48 hours of run-in operation.
  • Page 29 See Figure 5 for MH Fluid Cooler models MHF7111 and MHF7113 with belt drive option. The belts are adjusted by turning the threaded rod. Before tightening or loosening the belt, the double nuts holding the motor support in place must be loosened. There are two jam nuts at the end of the rod next to the casing.

  • Page 30: Sheave Alignment

    maintenance Sheave Alignment Always shut off electrical power to the fluid cooler fan motor prior Warning to performing any inspections that may involve physical contact with the mechanical or electrical equipment in or on the fluid cooler. Lock out and tag out any electrical switches to prevent others from turning the power back on. Service personnel must wear proper personal protective clothing and equipment. • The motor sheave is to be positioned as close as possible to the motor in order to minimize torque on the motor bushings.
  • Page 31 maintenance ALIGN THE TOP EDGES OF THE FAN AND MOTOR SHEAVES WHILE ENSURING THAT BOTH ARE FULLY ENGAGED ON THEIR SHAFTS. THERE SHOULD BE FOUR POINTS OF CONTACT WHEN A STRAIGHT EDGE IS LAID AROSS THE TOP OF BOTH SHEAVES. ALIGN THE BOTTOM EDGES OF THE FAN AND MOTOR SHEAVES WHILE ENSURING THAT BOTH ARE FULLY...

  • Page 32: Routine Maintenance

    maintenance Routine Maintenance Some maintenance procedures may require maintenance personnel to enter the fluid cooler. Each cased face of the fluid cooler has a door for access to the interior of the fluid cooler. The optional fan deck ladder—models MHF7111 and MHF7113—is designed and intended solely for personnel to gain access to the fan deck.
  • Page 33 maintenance reason to shut down the fluid cooler until the problem can be located and cor- rected. Observe operation of the motor, coupling (or drive shaft), Geareducer, (if equipped) and fan. Become familiar with the normal operating temperature of the motor(s), as well as the sight and sound of all components as a whole. If equipped, check Geareducer oil level.
  • Page 34 maintenance Clean and disinfect fluid cooler with biocides. Systems with biofouling, high general bacterial counts, or positive cultures of legionella may require additional cleaning. Refer to Fluid Cooler Cleaning section—page 22. Consult your water treatment expert as to prudent biological evaluation testing. Geareducer models used on doubleflow MH Fluid Coolers (Models Note MHF706 and MHF707) are designed for 5-year oil change inter-...

  • Page 35: Motor Relubrication (External Motor Option)

    maintenance Motor Relubrication Instructions Motor located outside plenum option. Doubleflow models MHF7111 and MHF7113 only. Open and lock out disconnect switch to make certain motor can- not be started. 1. Remove guard as shown in Figure 7. Opposite end motor bearing is accessible from outside the fluid cooler. 2. Remove grease fill and relief plugs at both shaft extension end and opposite end bearings and remove hardened grease, using clean wire.

  • Page 36: Seasonal Shutdown Instructions

    maintenance Seasonal Shutdown Instructions When the system is to be shut down for an extended period of time, it is recommended that the recirculation water system be drained. Leave the basin drains open. Draining the coil is not recommended—draining promotes corro- Caution sion inside the coil tubes.

  • Page 37: Long-Term Storage Procedures

    maintenance The motor(s) should be operated for three hours at least once a month. This serves to dry out windings and re-lubricate bearing surfaces. Refer to the Marley “Electric Motor User Manual” Manual 92-1475 available at spxcooling.com. At start of new operating season, make sure bearings are adequately lubricated before returning motor to service.
  • Page 38 maintenance to expel all air out of the unit. Finally, re-tighten the inlet nozzle blind flange bolts and let nitrogen pressure build up to 48 kPa inside the tube-bundle. Disconnect the nitrogen line and plug the isolation valve to avoid any pressure drop in case of valve leak.
  • Page 39 Fans: See “Fan User Manual” for instructions. SPX Cooling Technologies Services Our interest in your MH Fluid Cooler does not end with the sale. Having con- ceived, designed, and manufactured the most reliable and longest-lasting fluid cooler of its class, we want to make sure that you gain the maximum possible benefit from its purchase.

  • Page 40: Additional Information

    Each MH Fluid Cooler includes a document package containing general orientation drawings, and fluid cooler component manuals. These documents contain important information relating to safe installation and operation of the fluid cooler.

  • Page 41: 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 and pump motor exterior Coil surface...

  • Page 42: Troubleshooting

    troubleshooting Trouble Cause Remedy Check power at starter. Correct any bad connections between the control apparatus and the motor. Check starter contacts and control circuit. Reset overloads, close contacts, Power not available at motor terminals 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 Wrong connections...
  • Page 43 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, Geareducer noise. (If replace. equipped). Correct tooth engagement. Replace badly worn gears. Replace gears with Gears broken or damaged teeth.
  • Page 44 MH Fluid Cooler user manual S PX C O O L I N G T E C H N O LO G I E S U K LT D 3 KNIGHTBRIDGE PARK WAINWRIGHT ROAD WORCESTR WR4 9FA, UK P: 44 1905 750 270 F: 913 664 7439 info.uk@spx.com...

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