Instruction/ maintenance manual of the product Marley MH Marley MH Fluid Cooler SPX Cooling Technologies
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3 Contents Fluid Cooler Location ............................................................................. 5 Fluid Cooler Shipment ............................................................................ 6 Receiving Fluid Cooler ..............
4 Preparation The Marley MH Fluid Cooler with CoolBoost™, purchased for this instal- lation repr esents the current state of the art in crossflow , induced draft fluid cooler design. Thermally and operationally , it is the most efficient fluid cooler of its class.
5 Preparation It is not in tend ed no r as sume d tha t ac cess to the fa n deck on sin gle- flow models—Models MHF702 thru MHF705—is needed or necessary .
6 The fluid cooler must be located at such distance and direction to avoid the possibility of contaminated fluid cooler discharge air be- ing drawn into building fresh air intake ducts.
7 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.
8 Fasteners and components provided by others that are to be at- tached to the tower must be compatible with the cooling tower materials—i.e. fasteners in a stainless steel cold water basin must be stainless steel. 6. Attach pr ocess fluid supply and return piping to the coil.
9 • 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.
10 equipment. Electrical savings can be lar ge during periods of low ambient temperature when the cooling requirement can be satisfied at reduced speeds. T o benefit from these advantages, it is important that the drive be installed correctly . Marley supplies VFD and VFD controls specifically designed for our cooling products.
11 Mechanical Equipment: The fluid cooler is designed to operate at full speed and half speed. W arranty is void if the tower is operated at speeds which cause damaging vibrations to the tower and associated equipment.
12 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.
13 Fluid Cooler Start-Up Amon g other sou rces, out breaks of Legio nnaire s’ Diseas e have repo rt- edly been traced to cooling towers and fluid coolers.
14 7. While operating the recir culating water pump(s) and prior to operat- ing the cooling tower fan, execute one of the two alter native biocidal treatment pr ograms described in the following: • Resume tr eatment with the biocide which had been used prior to shutdown.
15 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.
16 4. Air flow rate: Reducing air flow throug h the fluid cooler causes the cold process fluid temperature to rise. This is the r ecommended method by which to control leaving pr ocess fluid temperature.
17 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.
18 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. R e ve rs e fa n op er at io n sh ou ld no t ne ed to ex ce ed 1 or 2 mi nu te s .
19 When the use of industrial antifreeze solutions is not possible, the system must be operated to meet both of the following conditions. 1. Maintain sufficient flow rate through the coil. 2. Maintain sufficient heat load on the process fluid. Fluid exiting the coil must be maintained at or above 45°F .
20 W ater T reatment and Blowdown Maintaining W ater Quality: The steel used in MH Fluid Cooler's has been galvanized with a heavy zinc coating averaging 2.0 mils in thickness. Other materials used (PVC fill, drift eliminators, and louvers, aluminum fans, cast iron Geareducer , etc.
21 Fluid Cooler Cleaning: Any evaporative-type fluid cooler must be thoroughly cleaned on a 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.
22 (percent of flow) required to maintain different concentrations with various cooling ranges*: * Range = Differ ence between hot water temperature and cold water temperature. EXAMPLE: 700 GPM circulating rate, 18°F cooling range. T o maintain 4 concentrations, the required blowdown is 0.
23 Maintenance 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 ar e two jam nuts at the end of the rod next to the casing.
24 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.
25 Fluid Cooler Maintenance Some maintenance procedur es 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— is de- signed and intended solely for personnel to gain access to the fan deck.
26 W eekly: Inspect for bacterial growth and general operation conditions. Bacterial growth should be reported to your water treatment expert for immediate attention. Monthly (W eekly at start up): Observe, touch, and listen to the fluid cooler . Become accustomed to its normal appearance, sound, and level of vibration.
27 additional cleaning. Refer to “Fluid Cooler Cleaning” section—page 21. Consult your water treatment expert as to prudent biological evaluation testing.
28 3. Insert grease fittings in grease fill openings and add grease until grease is forced out thr ough relief openings. 4. Replace fill plugs and operate mechanical equipment 30 minutes to one hour to pur ge excess grease at grease r elief opening.
29 has remained effective. Unless there is evidence of a generalized failure of the galvanizing, localized touch-up should be all that is requir ed. T o the extent that the galvanizing (zinc coating) still exists, paint will not adhere to it readily .
30 SPX Cooling T echnologies 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 pur chase.
31 Maintenance Schedule Maintenance Service Monthly Semi-annually Seasonal Startup or Annually Inspect General Condition and Operation x x Observe Operation of: Mechanical–motor , fan and drive mech.
32 Troubleshooting T rouble Cause Remedy Motor will not start Power not available at motor terminals Check power at starter . Correct any bad connections between the control apparatus and the motor . Check starter contacts and control cir cuit. Reset overloads, close contacts, reset tripped switches or r eplace failed control switches.
33 Troubleshooting T rouble Cause Remedy Geareducer noise. (If equipped). Geareducer bearings If new , see if noise disappears after one week of operation. Drain flush, and refill Gear educer oil. See Geareducer User Manual. If still noisy , replace.
34 Increased load requirements: MH Fluid Coolers are designed so that cells of either equal or unequal capacity can be added in the futur e. This allows you to compensate for the load increases that normally occur with the replacement or addition of production equipment—and still retain continuity with respect to your fluid cooler system.
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Manual 05-116D / 7401 W 129 Street // Overland Park, KS USA 66213 // +1 913 664 7400 // spxcooling@ct.spx.com // spxcooling.com / In the interest of technological progress, all products are subject to design and/or material change without notice. ©2007 SPX Cooling T echnologies, Inc.
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