Table of Contents
Advertisement
Advertisement
Table of Contents
Troubleshooting
Related Manuals for SPX Cooling Technologies MARLEY MH MHF702
Summary of Contents for SPX Cooling Technologies MARLEY MH MHF702
- Page 1 Marley MH Fluid Cooler User Manual sea_05-116E...
-
Page 3: Table Of Contents
Note Warning Caution Note Contents This manual contains vital information for the proper installation and operation of your fluid cooler. Carefully read the manual before installation or operation of the fluid cooler and follow all instructions. Save this manual for future reference. Fluid Cooler Location ... -
Page 4: Safety First
The location and orientation of the fluid cooler can affect the safety of those responsible for installing, operating or maintaining the fluid cooler. However, since SPX Cooling Technologies does not determine the location or orienta- tion of the fluid cooler, we cannot be responsible for addressing those safety issues that are affected by the fluid cooler’s location or orientation. -
Page 5: Fluid Cooler Location
Note Preparation It is not intended nor assumed that access to the fan deck on single-flow models—Models MHF702 thru 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 engineer 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 6: Fluid Cooler Shipment
Installation The fluid cooler must be located at such distance and direction to Warning avoid the possibility of contaminated fluid cooler discharge air be- ing drawn into building fresh air intake ducts. The purchaser should obtain the services of a Licensed Professional Engineer or Registered Architect to certify that the location of the fluid cooler is in compli- ance with applicable air pollution, fire and clean air codes. -
Page 7: Fluid Cooler Installation
Warning Note Installation Hoisting clips are provided for ease of unloading and positioning 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! Fluid Cooler installation These installation instructions are intended to help you prepare be-... -
Page 8: Motor Wiring
7. Wire motor(s) and recirculation pump(s) in accordance with wiring diagram. For maintenance/safety purposes, SPX Cooling Technologies recom- mends a lockout type disconnect switch for all mechanical equipment. In addition to a disconnect switch, the motor should be wired to main power supply through short circuit protection, and a magnetic starter with overload protection. - Page 9 Note Installation • Do not start the motor more than six times per hour. Short cycling the tower will cause fuses, breakers or O.L.s to operate and will decrease motor life. When using a two-speed starter: • Motor rotation must be the same at slow speed and high speed. •...
- Page 10 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 Cooling Technologies does not assume responsibility for any technical support or damages for problems associate with non-Marley brand VFD systems.
-
Page 11: Mechanical Equipment
Warning Warning Warning Installation Mechanical Equipment: The fluid cooler is designed to operate at full speed and half speed. Warranty is void if the tower is operated at speeds which cause damaging vibrations to the tower and associated equipment. When utilizing a variable frequency drive, the tower must be tested across the full range of speeds and checked against CTI guidelines for ex- cessive vibration. Speed ranges not meeting these guidelines must be locked out in the VFD. - Page 12 Note Caution Note Installation It is essential that the fan cylinder and fan guard be installed in ac- cordance with the drawings shipped with the tower. Do not force the fan cylinder out of round. 4. Momentarily bump (energize) the motor(s) and observe rotation of the fan(s).
-
Page 13: Fluid Cooler Start-Up
Warning Operation Fluid Cooler Start-Up Among other sources, outbreaks of Legionnaires’ Disease have report- edly been traced to cooling towers and fluid coolers. Maintenance and water treatment procedures that prevent amplification and dissemina- tion 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 14 Operation 7. While operating the recirculating water pump(s) and prior to operat- ing the cooling tower fan, execute one of the two alternative biocidal treatment programs described in the following: • Resume treatment with the biocide which had been used prior to shutdown.
-
Page 15: Fluid Cooler Operation
Note 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, Range – °F the cold process fluid temperature will rise. -
Page 16: Wintertime Operation
Caution Operation 4. air flow rate: Reducing air flow through the fluid cooler causes the cold process fluid temperature to rise. This is the recommended method by which to control leaving process fluid temperature. If your fluid cooler is equipped with a single-speed motor, the motor may be shut off when the process fluid temperature becomes too cold. - Page 17 Note Caution Operation Slushy, transitory ice forms routinely in the colder regions of the fill of low temperature towers, and is visible through the tower louvers. Such ice normally has no adverse effect on fluid cooler operation, but its appearance should be a signal to the operator to undertake ice control procedures. It is the operator's responsibility to prevent the formation of destruc- tive (hard) ice on the fluid cooler fill. Certain guidelines should be followed:...
- Page 18 Warning Warning Caution Warning Operation Reversal may be at either full or half speed; however, reversal at half speed is recommended. Reverse operation of the fan should be used sparingly and should only be used to control ice, not to prevent it. Reverse fan operation should not need to exceed 1 or 2 minutes.
- Page 19 Note Operation Coil Volume Model Liters MHF702__061 MHF702__081 MHF702__101 MHF702__121 MHF702__062 MHF702__082 MHF702__102 MHF702__122 MHF703__061 MHF703__081 MHF703__101 MHF703__121 MHF703__062 MHF703__082 MHF703__102 MHF703__122 MHF704__061 MHF704__081 MHF704__101 MHF704__121 1173 MHF704__062 MHF704__082 MHF704__102 1192 MHF704__122 1420 When the use of industrial antifreeze solutions is not possible, the system must be operated to meet both of the following conditions.
-
Page 20: Water Treatment
Note Maintenance Water Treatment and Blowdown Maintaining Water Quality: The steel used in MH Fluid Cooler's has been galvanized with a heavy zinc coating averaging .051mm in thickness. Other materials 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: Fluid Cooler Cleaning
Maintenance Fluid Cooler Cleaning: Any evaporative-type fluid cooler must be thoroughly cleaned on a Warning regular basis to minimize the growth of bacteria, including Legionella Pneumophila, to avoid the risk of sickness or death. Service personnel must wear proper personal protective equipment during decontami- nation. Do NOT attempt any service unless the fan motor is locked out. Operators of evaporative cooling equipment, such as closed circuit cool- ing towers, should follow maintenance programs which will reduce to an absolute minimum the opportunity for bacteriological contamination. -
Page 22: Belt Adjustment
Note Maintenance (percent of flow) required to maintain different concentrations with various cooling ranges*: n i l 3°C 6°C 8°C 11°C 14°C e i l * Range = Difference between hot water temperature and cold water temperature. EXaMPLE: 44.2 L/s circulating rate, 10°C cooling range. To maintain 4 concentrations, the required blowdown is 0.467% or .00467 times 44.2 L/s, which is 0.2 L/s. - Page 23 Figure 1 Figure 2 Maintenance JACKING SCREWS SINGLE MOTOR—TWO FANS See Figure 3 for MH Fluid Cooler models MHF706 and MHF707.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 24: Sheave Alignment
Figure 3 Maintenance sion 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. Overtensioning shortens belt and bearing life. Keep belts free from foreign material which may cause slipping. Never apply belt dress- ing as this will damage the belt and cause early failure. -
Page 25: Fluid Cooler Maintenance
Bushing Fastener Torque Values Warning Warning Maintenance Fluid Cooler 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 tower. The optional fan deck ladder—models MHF706 and MHF707—... - Page 26 Maintenance Weekly: Inspect for bacterial growth and general operation conditions. Bacterial growth should be reported to your water treatment expert for immediate attention. Monthly (Weekly at start up): Observe, touch, and listen to the fluid cooler. Become accustomed to its normal appearance, sound, and level of vibration.
- Page 27 Note Maintenance Clean and disinfect cooling tower 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 21. Consult your water treatment expert as to prudent biological evaluation testing.
-
Page 28: Seasonal Shutdown Instructions
Figure 4 Caution Maintenance Motor Grease Fill Plug Grease Relief Plug wire. 3. Insert grease fittings in grease fill openings and add grease until grease is forced out through relief openings. 4. Replace fill plugs and operate mechanical equipment 30 minutes to one hour to purge excess grease at grease relief opening. -
Page 29: Prolonged Shutdown
Maintenance bright metal can be exposed by cleaning, consider that the galvanizing has remained effective. Unless there is evidence of a generalized failure of the galvanizing, localized touch-up should be all that is required. Note To the extent that the galvanizing (zinc coating) still exists, paint will not adhere to it readily. Contact the manufacturer of the coating you intend to use for instructions. - Page 30 Maintenance representative for additional information. SPX Cooling Technologies Services Our interest in your MH Fluid Cooler does not end with the sale. Having conceived, 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 31: Maintenance Schedule
Maintenance Schedule Maintenance Service 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 Check:... -
Page 32: Troubleshooting
Troubleshooting Trouble Cause Power not available at motor terminals Wrong connections Motor will not start Low voltage Open circuit in motor winding Motor or fan drive stuck Rotor defective Motor running single-phase Motor leads connected incorrectly Bad bearings Unusual motor noise Electrical unbalance Air gap not uniform Rotor unbalance... - Page 33 Troubleshooting Trouble Cause Geareducer bearings Geareducer noise. (If equipped). Gears Loose bolts and cap screws Unbalanced drive shaft or worn couplings. (If equipped) Unusual fan drive vibration Worn Geareducer bearings. (If equipped) Worn fan shaft bearings. (Belt drive). Unbalanced motor Bent Geareducer shaft.
-
Page 34: Additional Information
Additional Information the norm. This service is not intended to replace the important function performed by your maintenance staff. Their attention assures the fluid coolers’s routine operating performance, and is invaluable. However, we recognize that the unusual manner in which a fluid cooler performs its function—as well as the unique forces which act upon it—may be considerations which oc- casionally require the services of an expert technician. - Page 36 SPX COOLING TECHNOLOGIES MALAYSIA Sdn Bhd UNIT 505, BLOCK B, PHILEO DAMANSARA 2 | NO. 15 JALAN 16/11, OFF JALAN DAMANSARA | 46350 PETALING JAYA, MALASIA | 60 3 7665 1018 | spxcooling.com In the interest of technological progress, all products are subject to design and/or material change without notice.