Marley MH Fluid Cooler - SPX Cooling Technologies
Contents
1. ACCESS DOOR INSTALLED HEIGHT hula SIDE ELEVATION AIR INLET ELEVATION Dimensions Shipping Weight Ib Motor Pump Model LE W H Weight Heaviest Section hp hp MHF7111 TISL 23 10 6 21 6 32 100 20 010 20 75 2075 MHF7113 Jersin 25O 21 6 38 070 24 620 30 75 2075 MH Fluid Cooler Engineering Data Support 6 AIR INLET FACE Ra AIR INLET FACE AIR INLET F FACE ANCHOR BOLT ANCHOR BOLT ANCHOR BOLT ANCHOR BOLT ANCHOR BOLT ANCHOR BOLT ANCHOR BOLT ANCHOR BOLT 3 1 2 D gt 3 1 2 gt kk D D gt E 3 1 2 SINGLE FLOW MODELS DOUBLE FLOW MODELS Maximum Maximum Modal D Deflection Mecel D Deflection MHF7101 8 2 Y MHF7111 11 3V8 Vo MHF7103 sj U MHF7113 19 814 u MHF7105 8 2 Y MHF7107 11 9 y MHF7109 11 9 y Use this data for preliminary layouts only Obtain detailed support drawings from your Marley sales representative Primary support consists of parallel l beams running the full length of the unit FLUID COOLER COIL When the ambient temperature falls below 32 F heat loss from the coil be substantial even without recirculating water flowing over the coil The process fluid without an applied heat load may be prone to2. for a period of eighteen 18 months from the date of shipment Models MHF7111 and MHF 7113 Add the following in the Coil section An extended surface tube bundle shall be included at both wet section air inlet faces of the tower to enable part load seasonal dry operation The finned tube bundle shall be constructed of fully welded box headers and finned tube cir cuits and shall be hot dip galvanized after fabrication Minimum design operating pressure shall be 150 psi The coil shall be warranted against any failure caused by defects in materials and workmanship for a period of eighteen 18 months from the date of shipment Extended Geareducer Lube Line with Dipstick Add the following paragraph to the Mechanical Equipment section An external oil level dipstick shall be located adjacent to the motor at the fan deck surface and shall be accessible from a portable maintenance ladder Fan Cylinder Extension Add the following paragraph to the Mechanical Equipment section Fan cylinder extensions shall be provided to elevate the fan discharge to a height of ____ ft above the fan deck level Water Distribution System Warm Air MX75 Fill Finned Tube Bundle tional optional Air In Coil Louvers Air In Eliminators Cold Fluid Out Coil Hot Fluid In Redistribution Pump Dry cooling option on models MHF7103 MHF7105 and MHF7107 E The dipstick option is accessible from a portable maintenance ladder
3. issues associated with long driveshafts The VFD shall be programmed for variable torque applications and shall catch a fan spinning in the forward or reverse direction IL 3 E Marley VFD drive systems are designed Submerged in basin water in which zinc ions are present copper immersion heaters must not be used Insist upon stainless steel The ambient air temperature that you insert in the specifications should be the lowest 1 level of winter temperature prevalent at site E Solid state liquid level controls provide you with state of the art systems to control and monitor the water level in your fluid cooler collection basin Relays operating in conjunction with suspended stainless steel electrode probes moni tor basin water levels providing simple solenoid valve water makeup or discrete on off signals to more sophisticated automation controls Optional configura tions might include water makeup along with high and low water level alarm and cutoff or pump cutoff Packaged systems including any of these variations are available Consult your Marley sales representative or download a copy of ACC NC 9 from spxcooling com for additional information to combine absolute temperature con trol with ideal energy management The fluid cooler user selects a cold water temperature and the drive system will vary the fan speed to maintain that tem perature Precise temperature control is accomplished with far less stress to the mechani
4. steel U edging and shall be removable ing weather Heat loss data from the coil can be obtained by accessing the Marley UPDATE web based selection software at spxcooling com Pneumatic damper actuators are UL approved totally enclosed with spring return actuators Electric actuators are industrial grade NEMA 4 rated 2 posi tion drive both ways The damper section protrudes from the louver face a mini mum of 6 Ii For many years a feature of Marley cooling towers was that the electric motors were located outside the fan cylinders where they were easily accessible and where they were not subjected to the constant humidity that exists inside the tower plenum Although improved motor designs insulation bearings seals and lubricants have now made it feasible for us to locate the motor inside in close coupled proximity to the Geareducer many users still prefer the motor to be located outside the humid airstream If you are among those users or are among those who see the wisdom of their thinking please specify this option E For process fluid above 135 F IBi In wooded or windy areas these screens help to keep leaves or blowing debris out of the fluid cooler and circulating water system i SS MH Fluid Cooler Specifications Options 25 Specifications Specification Value FM Approval Add the following paragraph in the Construction section The tower shall be listed in the current FM Approval Guide appr
5. 24 FM Approval 25 Basin Sweeper Piping 25 Sound Control 25 Inlet Sound Attenuation 26 Quiet Fan 26 Ultra Quiet Fan 26 Dry Cooling Operation 27 Extended Geareducer Lube Line with Dip Stick 27 Fan Cylinder Extensions 27 MH Fluid Cooler The Marley MH Fluid Cooler is one of the most e fficient closed circuit heat rejection products on the market and your best choice for industrial and HVAC applications By keeping the process fluid in a clean closed loop and combining the function of a cooling tower and heat exchanger into one system the MH Fluid Cooler can provide superior operational and maintenance benefits The specifications portion of this publication not only relates the language to use in describing an appropriate MH Fluid Cooler but also defines why certain items and features are important enough to specify with the intention of insisting upon compliance by all bidders The left hand column of pages 9 thru 27 provides appropriate text for the various specification paragraphs whereas the right hand column comments on the meaning of the subject matter and explains its value Pages 9 thru 14 indicate those paragraphs which will result in the purchase of a basic fluid cooler one that accomplishes the specified thermal performance but which will lack many operation and maintenanc
6. baffles shall be constructed of perforated sheet metal filled with sound absorbing material and contained within a steel box that is self supporting The inlet attenuation shall not impact the thermal performance efficiency of the basic fluid cooler configu ration Quiet Fan Replace paragraph 7 1 with the following Fan s shall be propeller type incorporating a minimum of seven aluminum alloy blades attached to galvanized hubs with U bolts Blades shall be individually adjustable Maximum fan tip speed shall be 11 000 ft min Fan s shall be driven through a right angle industrial duty oil lubricated geared speed reducer that requires no oil changes for the first five 6 years of operation The gearbox bearings shall be rated at an L gA service life of 100 000 hours or greater The gear sets shall have AGMA Quality Class of 9 or greater Ultra Quiet Fan MHF7107 MHF7109 MHF7111 and MHF7113 models only Replace paragraph 7 1 with the following Fan s shall be axial design incorporating wide chord acoustic geometry corrosion and fire resistant marine grade aluminum blades and aluminum hubs Blades shall be resiliently mounted to fan hub and individu ally adjustable Fan blades shall be open cavity with suitable drainage to avoid accu mulation of moisture Foam filled blades are not allowed due to potential moisture contamination of the foam core causing an imbalance of the fan leading to vibra tion issues Maxim
7. be capable of withstanding water having a chloride content NaCl up to 750 ppm a sulfate content S04 up to 1200 ppm a calcium content CaCO3 up to 800 ppm silica SiO9 up to 150 ppm The circulat ing water shall contain no oil grease fatty acids or organic solvents Stainless Steel Collection Basin Replace paragraph 12 1 with the follow ing The collection basin shall be welded 301L stainless steel construction Only low carbon stainless steel alloys will be accepted in order to minimize the risk of intergranular corrosion in the weld zones Suction connections shall be equipped with stainless steel debris screens All steel items which project into the basin coil supports anchor clips etc shall also be made of stainless steel A factory installed float operated mechanical makeup valve and waste water blowdown line shall be included An overflow and drain connection shall be provided in each cell of the fluid cooler The basin shall include a depressed section into which accumulated particle debris can be flushed to permit cleaning The basin floor adja cent to the depressed section shall slope toward the depressed section to prevent buildup of debris under the coil area IBi For pure resistance to corrosion coupled with the capability to meet stringent fire and building codes there is no substitute for stainless steel No paints or electrostatically applied coatings however exotic they may be can match sta
8. in a NEMA 3R outdoor enclosure designed specifically for fluid cooler applications The panel shall include a main thermal magnetic circuit breaker disconnect with an external operating handle lockable in the off position for safety For spray pump operation use of a full volt age non reversing magnetic starter with man ual ON and OFF control via a door mounted selector switch shall be provided Dry status contacts wired to user terminal points indicat ing typical alarm and status events shall be provided Two safety circuits for the spray pump low water cut off preventing a dry run pump and a pump shut down upon approach ing treezing temperatures in the cold water basin shall be provided Available Options Water level control with various combinations of make up high alarm low alarm high cut off and low cutoff events Basin heater controller with low water cutout Spray pump heat trace circuit Power for damper actuator motor Circuit breaker feeder for a remote mounted VFD Vibration Limit Switch Add the following paragraph in the Mechanical Equipment section A vibra tion limit switch in a NEMA 4 housing shall be installed on the mechanical equipment support for wiring to the shut down circuit of the fan motor starter or VFD The purpose of this switch will be to interrupt control power voltage to a safety circuit in the event of excessive vibration causing the starter or VFD equipment to de energize the motor I
9. of success If extended longevity of the fluid cooler is required or unusually harsh operating conditions are expected consider specifying stainless steel as either the base construction material or the material utilized for specific components of your choice See Stainless Steel Options on page 14 E Axial flow fans require only half the operating hp of blower type fans The Marley drive system features all aluminum sheaves matched belts and long life bear ings for dependable service To reduce cost some manufacturers may use TEAO motors whose only source of cooling is the flow of air produced by the fluid cooler fan They are sometimes applied at horsepowers significantly beyond their nameplate rating Unless otherwise specified motor speed will be 1800 RPM 60 Hertz on stan dard models E The exclusive Marley System5 Geareducer requires no oil changes for five years offering you unmatched reliability and low maintenance MH Fluid Cooler Specifications Base 19 Specifications Specification Value hours or greater and the gear sets shall have AGMA Quality Class of 9 or greater The gearbox shall include any modifica tions to enable operation down to 10 of full speed Fan motor s shall be ____ hp maximum NEMA Premium Efficiency TEFC 1 15 service factor variable torque inverter duty and specially insulated for cooling fluid cooler duty Class F Speed and electrical characteristics shall be RPM si
10. reverse direction without tripping VFD panel con struction shall include a main disconnect with short circuit and thermal overload pro tection with external operating handle lock able in the off position for lock out tag out safety procedures A service switch directly ahead of the VFD shall be provided for voltage isolation during VFD maintenance An integrated full voltage non reversing bypass starter shall be furnished allow ing fan motor operation if VFD has failed In the event of a system fault the VFD program logic shall evaluate type of fault determining if safe to automatically transfer fan motor to the bypass starter Automatic bypass with an earth ground condition shall not be allowed Once in bypass mode the internal controls will continue to monitor cold water temperature and cycle the fan motor on and off maintaining cold water set point temperature The drive system shall be designed and operated as a stand alone system without the need for a BMS system Operator controls shall be mounted on the front of the enclosure and shall consist of Start and Stop control Bypass VFD selector switch Auto Manual selector switch Manual speed control and solid state temperature controller An emergency bypass starter selector switch internal to the panel allowing the fan motor to be run at full speed shall be furnished The system shall include a solid state PI temperature controller to adjust frequency output of the drive in
11. 50 4 290 3 150 3 15 2 MHF7101__E 6 0 8 4 he Glee 5 790 3 790 4 600 3 680 3 15 2 MHF7103__A 9 0 8 4 46 14 7 7 590 4 460 6 280 3 150 5 20 3 MHF7103__B 9 0 4 8 4 4e 16 1 8 830 5 700 6 810 3 680 5 20 3 MHF7103__D 9 0 8 4 6 15 11 6 7810 4 460 6 500 3 350 5 20 3 MHF7103__E 9 0 4 8 4 4e 17 5 As 9 050 5 700 7 030 3 680 DE20 3 MHF7105__A 2 0 8 4 e 14 7 9 270 5 530 7 800 4 060 75 25 5 MHF7105__B 2 0 8 4 6 16 1 4 10 630 6 890 8 590 4 850 ZORD 5 MHF7105__D 2 0 8 4 46 15 11 6 9 530 5 530 8 060 4 060 75 25 5 MHF7105__E 2 0 4 8 4 6 17 5 Ae 10 890 6 890 8 850 4 850 75 25 5 MHF7107__A 2 0 1111 17 5 a 14 680 9 070 11 900 6 290 10 40 75 MHF7107__B 2 0 ia 18 11 4 17 000 11 390 13 330 7 720 10 40 75 MHF7107__D 2 0 4 11 11 18 9 4 15 030 9 070 12 250 6 290 10 40 75 MHF7107__E 2 0 ie 20 3 4 17350 11 390 13 680 7 720 10 40 75 MHF7109__A 8 0 i i b 17 5 6 21 160 13 320 n 15 45 75 MHF7109__B 8 0 HIST 18 11 6 25 680 17 750 15 45 75 MH Fluid Cooler Engineering Data Schematic PLAN VIEW Use this data for preliminary layouts only Obtain current drawing from your Marley sales representative UPDATE web based selection software available at spxcooling com update provides MH Fluid Cooler model recommendations based on customer s specific design requirements
12. All low sound options shall be CTI Certified for thermal performance Location 63 125 250 500 1000 Air Inlet SPL Cased Face SPL Fan Discharge SPL Location 2000 4000 8000 Overall dB A Air Inlet SPL Cased Face SPL Fan Discharge SPL E This could have a very beneficial effect upon your fire insurance premiums Towers not able to meet FM requirements may require the inclusion of a fire protection sprinkler system to achieve a comparable level of insurance premium cost Even if you are not insured by FM this requirement ensures that each cell will contain any fire that may occur without losing the ability of limited opera tions and capacity APPROVED E Sound produced by a standard MH Fluid Cooler operating in an unobstructed environment will meet all but the most restrictive sound limitations and will react favorably to natural attenuation Where the fluid cooler has been sized to operate within an enclosure the enclosure itself will have a damping effect on sound Sound also declines with distance by about 5 or 6 dB A each time the distance doubles Where sound at a critical point is likely to exceed an accept able limit you have several options listed below in ascending order of cost impact Where only a slight reduction in sound will satisfy and the source of concern is in a particular direction merely turning the fluid cooler may be the answer Less sound emanates from the cased face of the fluid cooler tha
13. SP ENGINEERING DATA AND SPECIFICATIONS MH Fluid Cooler Vr gt Marley MH Fluid Cooler Table of Contents Engineering Data Specifications Base Specifications Options Schematic Single Flow Models 4 Schematic Double Flow Models 5 Support 6 Freeze Prevention 7 Water Quality 8 Base 9 Thermal Performance 9 Performance Warranty 10 Coil 10 Design Loading 10 Construction 11 Mechanical Equipment 11 Fill Louvers and Drift Eliminators 12 Distribution Basin 13 Casing Fan Deck and Fan Guard 13 Access 14 Collection Basin 14 Warranty 14 Alternate Material Options All Stainless Steel Fluid Cooler 15 Stainless Steel Collection Basin 15 Stainless Steel Distribution Basin 16 Copper Coil 16 Stainless Steel Coil 16 Convenience and Safety Options Guardrail and Ladder 17 Distribution Basin Access Platform 17 Ladder Extension 17 Ladder Safety Cage 17 Ladder Safety Gate 18 Access Door Platform 18 Plenum Walkway 18 Interior Mechanical Equipment Access Platform 19 Control Options Combination Fan and Pump Motor Control Panel 19 Pump Motor Control Panel 20 Vibration Limit Switch 20 Basin Heater 20 Water Level Control 21 Fan Motor Variable Speed Drive 21 Miscellaneous Options Dampers 24 Motor Out of the Airstream 24 High Temperature Fill 24 Air Inlet Screens
14. Two safety circuits for the spray pump low water cut off preventing a dry run pump and a pump shut down upon approaching freezing temperatures in the cold water basin shall be provided Available options Water level control with various combinations of make up high alarm low alarm high cut off and low cutoff events Basin heater controller with low water cutout Spray pump heat trace circuit Power and control for damper actuator motor E An elevated fiberglass bar grating service platform with aluminum ladder pro vides a permanent working surface to inspect and maintain the mechanical equipment components E If it is your opinion that the control system for the fluid cooler be part of the fluid cooler manufacturer s responsibility we are in wholehearted agreement with you Who better to determine the most efficient mode and manner of a fluid cooler s operation and to apply a system most compatible with it than the designer and manufacturer of the fluid cooler Marley variable speed drives are also available for the ultimate in temperature control energy management and mechanical equipment longevity ek SS MH Fluid Cooler Specifications Options 20 Specifications Specification Value Pump Motor Starter Control Panel used when a VFD controls the fan Add the following paragraph in the Mechanical Equipment section Each cell of the fluid cooler shall be equipped with a UL CUL 508 listed control panel
15. agraph 6 1 They are to be regarded as minimum requirements Where component materials unique to individual fluid cooler designs are not specified the manufacturers shall take the above water quality and load carrying capabilities into account in the selection of their materials of manufacture Mechanical Equipment MHF7101 MHF7103 MHF7105 MHF7107 and MHF7109 Fan s shall be driven through a one piece multi groove solid back V type belt Bearings and fan shaft shall be contained in a cast steel housing to insure proper fan shaft alignment pillow block bearings are not allowed Bearings shall be rated at an L 0A service life of 40 000 hours or greater MHF7111 and MHF7113 Fan s shall be heavy duty high efficiency low sound axial design incorporating aluminum alloy blades attached to galvanized steel hubs with U bolts Blades shall be individually adjustable Fan s shall be driven through a right angle industrial duty oil lubricated geared speed reducer that requires no oil changes for the first five 5 years of operation All gearbox bearings shall be rated at an L gaA service life of 100 000 lll IBi In the history of fluid coolers no other coating for carbon steel has exhibited the success and longevity of galvanization in exposure to the normal fluid cooler water quality defined at left No paints or electrostatically applied coatings however exotic they may be can approach galvanization s history
16. andard 5 0 and 11 0 lengths Co wo Es en MH Fluid Cooler Specifications Options 18 Specifications Specification Value Ladder Safety Cage Add the following paragraph in the Access section A heavy gauge alumi num safety cage welded into subassem blies for ease of field installation shall surround the ladder extending from a point approximately 7 O above the foot of the ladder to the top of the guardrail surrounding the fan deck or platform Maximum weight of welded subassem blies shall not exceed 20 Ib for ease of installation Ladder Safety Gate Add the following paragraph in the Access section A steel self closing gate shall be provided at the guardrail level of the ladder Access Door Platform Add the following paragraph in the Access section There shall be a gal vanized access platform at the base of the fluid cooler endwall access door The platform shall be surrounded by an OSHA compliant guardrail system welded into subassemblies for easy installation The walking surface of the platform shall be perforated to provide a non slip surface for personnel safety Plenum Walkway Add the following paragraph in the Access section Provide a factory installed heavy gauge steel walkway with safety grip perforations extending from one cased face access door to the other cased faced access door This walkway shall be supported by a steel framework and the top to the walkway
17. cal equipment components The improved energy management pro vides fast payback Motors operated on a VFD shall carry a service factor of 1 0 When operating on a VFD the drive parameters should be programmed to limit the current to motor nameplate hp Adjust the Motor specification accordingly MH Fluid Cooler Specifications Options 29 Specifications Specification Value without tripping VFD panel construction shall include a main disconnect with short circuit and thermal overload protection with external operating handle lockable in the off position for lock out tag out safety pro cedures A service switch directly ahead of the VFD shall be provided for voltage isola tion during VFD maintenance An integrat ed full voltage non reversing bypass starter shall be furnished allowing fan motor oper ation if VFD has failed The VFD system shall receive a speed reference signal from the building management system monitor ing the fluid cooler cold water temperature As an option to receiving the speed refer ence signal from a building management system the drive must have the capability to receive a 4 20 mA temperature signal from an RTD transmitter When using an RTD for temperature monitoring and speed control the VFD shall have an internal PI regulator to modulate fan speed maintain ing set point temperature The drive s panel shall display the set point temperature and cold water temperature on two separate lines Th
18. coverage of the coil at a flow rate sufficient to ensure complete wetting of the coil during operation The basin shall be installed and sealed at the factory and assembled with bolted connections Tap screws shall not be allowed Casing Fan Deck and Fan Guard The casing and fan deck shall be heavy gauge G 235 galvanized steel panels The top of the fan cylinder s shall be equipped with a conical non sagging removable fan guard fabricated of welded 5 16 and 7 gauge rods and hot dip gal vanized after fabrication Access A large galvanized steel rectangular access door shall be located on both endwalls for entry into the cold water basin and fan plenum area Access doors shall be a minimum of 24 wide and 42 tall and shall be operable from inside as well as outside of the fluid cooler Specification Value E Drift rate varies with design water load ing and air rate as well as drift elimina tor depth and number of directional changes A drift rate of 0 001 is read ily available on many standard models If a lower rate is required please discuss with your Marley sales representative E Gravity flow distribution basins are a feature of the MH Fluid Cooler result ing in operating pump heads less than that encountered in fluid coolers with pressurized spray systems Also these basins are out where they can be eas ily inspected even maintained while the fluid cooler is in operation Pressurized spray sy
19. d Cooler Specifications Base 10 Specifications Specification Value Performance Warranty CTI and Eurovent Certification notwith standing the fluid cooler manufacturer shall guarantee that the fluid cooler supplied will meet the specified perfor mance conditions when the fluid cooler is installed according to plans lf because of a suspected thermal performance defi ciency the owner chooses to conduct an on site thermal performance test under the supervision of a qualified disinter ested third party in accordance with CTI Eurovent or ASME standards during the first year of operation and if the fluid cooler fails to perform within the limits of test tolerance then the fluid cooler man ufacturer will pay for the cost of the test and will make such corrections as are appropriate and agreeable to the owner to compensate for the performance defi ciency Coil Coil s shall consist of fully welded box headers with serpentine tube circuits and shall be hot dip galvanized after fabrica tion The coil s shall be designed for free drainages of fluid at shutdown Minimum design operating pressure shall be 150 psi Coil s shall be warranted against any failure caused by defects in materials and workmanship for a period of eighteen 18 months from the date of shipment Design Loading The structure and anchorage shall be designed to withstand a wind load of 30 psf while operating The fluid cooler shall be designed
20. e bypass shall include a complete electromechanical magnetic bypass circuit with the capability to isolate the VFD when in the bypass mode Transfer to the bypass mode shall be manual in the event of VFD failure Once the motor is transferred to the bypass circuit the fan motor will run at constant full speed Operator controls shall be mounted on the front of the enclosure and shall consist of Start and Stop con trol Bypass VFD selection Auto Manual selections and manual speed control To prevent heating problems in the fan motor the VFD system shall de energize the motor once 25 motor speed is reached and cooling is no longer required The manufacturer shall supply VFD start up assistance by a certified technician Marley Premium VFD System Add the following paragraph in the Mechanical Equipment section when VFD is used as a stand alone system and not controlled by a BMS For fan control a complete UL listed variable speed drive system in a NEMA 12 indoor or NEMA 3R outdoor enclosure shall be provided The VFD shall use PWM tech nology with IGBT switching VFD output switching signal shall be programmed as not to cause mechanical vibration issues with back lash in gearbox teeth or vibration issues associated with long drive shafts MH Fluid Cooler Specifications Options 99 Specifications Specification Value VFD shall be programmed for variable torque application The VFD shall catch a fan spinning in the forward or
21. e enhancing accessories and features that are usually desired by those persons who are responsible for the continuing operation of the system of which the fluid cooler is part It will also incorporate those standard materials which testing and experience has proven to provide acceptable longevity in normal operating conditions Pages 15 thru 27 provide paragraphs intended to add those features components and materials that will customize the fluid cooler to meet the user s requirements MH Fluid Cooler Engineering Data Schematic 2 3 MAX PLAN VIEW Use this data for preliminary layouts only Obtain current drawing from your Marley sales representative UPDATE web based selection software available at spxcooling com update provides MH Fluid Cooler model recommendations based on customer s specific design requirements H INSTALLED FLUIp our HEIGHT ACCESS DOOR FLUID IN PUMP E SIDE ELEVATION AIR INLET ELEVATION Shipping Weight Shipping Weight Dimensions NUR oie MAWA DE Ne Steel Coil Ib Copper Coil Ib Motor Pump Heaviest Heaviest hp hp L w H Weight nes Weight Gan Section Section MHF7101__A 6 0 8 4 46 12 10 4 880 3 050 4 120 3 150 3 15 2 MHF7101__B 6 0 8 4 6 14 4 5 620 3 790 4 430 3 680 3 15 MHF7101__D 6 0 8 4 46 14 7 5 050 3 0
22. ection when the damp ers are closed All linkage and axles shall be stainless steel and the blade bear ings shall be corrosion resistant molded synthetic bearings Damper blades shall be single skin constructed from G60 galvanized steel Damper frame shall also be manufactured from G60 galvanized steel Damper actuators shall be either pneumatic or electric depending on cus tomer s preference Dampers shall be field installed and actuators shall be wired by others Motor Out of the Airstream MHF7111 and MHF7113 models only with gear drive option Add the following to the end of para graph 7 1 The motor shall be mounted outside the casing of the fluid cooler and shall be connected to the gear reducer by a dynamically balanced stainless steel tube and flange drive shaft High Temperature Fill Replace paragraph 8 1 with the fol lowing Replace paragraph 8 1 with the following Fill shall be film type thermoformed of 20 mil thick high tem perature PVC with louvers and elimina tors formed integrally in each fill sheet Fill shall be suspended from stainless steel structural tubing supported from the fluid cooler structure The air inlet face s of the fluid cooler shall be free of water splashout Air Inlet Screens Add the following paragraph The air inlet faces of the top module fill area of the fluid cooler shall be covered by 1 mesh hot dip galvanized welded wire screens Screens shall be mounted in galvanized
23. er and guardrail on these models Portable ladders and other make do access means are inappropriate for equipment of this size and com plexity Also fixed ladders without fan deck guardrails invite unsafe maintenance practices and must not be allowed E Periodic inspection and maintenance of a fluid cooler distribution system is fundamental to preserving maximum cooling system efficiency All fluid cool ers crossflow or counterflow are subject to clogging to varying degrees by waterborne contaminants such as pipe scale and sediment Therefore safe and easy access to these components is of significant value to the operator Access can be provided in a number of ways including portable ladders or scaffolding but for maximum safety and convenience a field installed Marley access platform with guardrails is available to make this task as safe and user friendly as possible Further its location on the side of the tower does not add to the height of the unit preserving architectural integrity It also saves the owner time and money in that maintenance personnel may devote their time to inspection rather than searching for ladders or erection of portable scaffolding Many fluid coolers are installed such that the base of the unit is 2 O or more above the roof or grade level This makes it difficult to get up to the foot of the attached ladder The ladder extension alleviates this problem Marley ladder extensions are available in st
24. free drainage when vented E The indicated design values are the minimum allowables under accepted design standards They give you assurance that the fluid cooler can be shipped handled hoisted and ultimately operated in a normal fluid cooler environment Most MH Fluid Cooler models will withstand significantly higher wind and seis mic loads If your geographic location dictates higher wind load or seismic load values please make the appropriate changes after discussion with your Marley sales representative 7 1 MH Fluid Cooler Specifications Base 11 Specifications Specification Value Construction Except where otherwise specified all components of the fluid cooler shall be fabricated of heavy gauge steel pro tected against corrosion by G 235 galva nizing After passivation of the galvanized steel 8 weeks at pH 7 8 and calcium hardness and alkalinity at 100 300 ppm each the fluid cooler shall be capable of withstanding water having a pH of 6 5 to 9 0 a chloride content up to 500 ppm as NaCl 300 ppm as Cl a sulfate content as S04 up to 250 ppm a calcium con tent as CaCO3 up to 500 ppm silica as SiOo up to 150 ppm The circulating water shall contain no oil grease fatty acids or organic solvents The specifications as written are intended to indicate those materials that will be capable of withstanding the above water quality in continuing service as well as the loads described in par
25. freezing There are various methods to protect against coil freezing Ethylene and propylene glycol solutions are the best means to protect against coil freezing and are recommended for most installations The appropriate concentration of ethylene or propylene glycol should be determined based on the required protection from low ambient temperatures If the use of an industrial antifreeze solution is not compatible with the system another accepted method of preventing coil freezing is to maintain a sufficient flow rate and heat load on the process fluid The fluid exiting the coil must be maintained at or above 45 F at the full process flow rate If the process load does not yield such a heat load it may be necessary to apply a supplementary heat load to the process fluid Draining galvanized steel coils is not considered to be an acceptable means of protection against freezing Introducing air to the inside of the heat exchanger coil will promote corrosion In an emergency this alternative can be used in the event that the process fluid drops below 45 F the ambient temperature is below freezing and the coils are not protected with industrial antifreeze Copper coils and series 300 stainless steel coils may be drained as necessary without significantly increasing corrosion risk Cycling of the recirculating water pumps to control process flow temperatures must be approached with caution Frequent cycling of the recirculating water pump
26. ight and other benefits The thermal performance ratings of the MH Fluid Cooler with the cop per coil option are certified by the Cooling Technology Institute IBi For process fluids that are not compatible with the standard hot dip galva nized carbon steel construction stainless steel offers you the ultimate in cor rosion resistance and long life The thermal performance ratings of the MH Fluid Cooler with the stainless steel coil option are certified by the Cooling Technology Institute SS SS SS MH Fluid Cooler Specifications Options 17 Specifications Specification Value Convenience and Safety Options Guardrail and Ladder MHF7111 and MHF7113 models only Add the following paragraph in the Access section The top of the fluid cooler shall be equipped with a guardrail complete with kneerail and toeboard designed according to OSHA guidelines and factory welded into sub assemblies for ease of field installation Posts toprails and kneerails shall be 1 5 square tub ing The guardrail assembly shall be hot dipped galvanized after welding and capable of withstanding a 200 Ib con centrated live load in any direction Posts shall be spaced on centers of 8 O or less A 1 6 wide aluminum ladder with 3 l beam side rails and 1 25 diameter rungs shall be permanently attached to the endwall casing of the tower rising from the base of the fluid cooler to the top of the guardrail Distribution Basin Access P
27. in less steel s ability to withstand adverse operating conditions E The cold water basin is the only part of the tower that is subject to periods of stagnant water concentrated with treatment chemicals and customary contami nants It is also the most expensive and difficult part of any tower to repair or replace For these reasons many customers particularly those who are replac ing older towers choose to specify stainless steel cold water basins co gt MH Fluid Cooler Specifications Options 16 Specifications Specification Value Stainless Steel Distribution Basin Replace paragraph 9 1 with the follow ing An open 301L stainless steel basin above the fill with removable interchange able polypropylene nozzles installed in the floor of the basin shall provide full cover age of the fill by gravity flow The basin components shall be installed and sealed at the factory and connected with bolted connections Tap screws shall not be allowed The basin shall be equipped with removable stainless steel covers capable of withstanding the loads described in paragraph 5 1 The water distribution sys tem shall be accessible and maintainable during tower fan and water operation Replace paragraph 9 2 with the follow ing A redistribution basin below the fill with polypropylene nozzles installed in the floor of the basin shall provide full cover age of the coil at a flow rate sufficient to ensure complete wetti
28. latform Add the following paragraph in the Access section Provide an external plat form near the top of the louver face for access to the hot water distribution sys tem The platform shall be heavy gauge galvanized steel with safety grip perfo rations supported by galvanized steel framework attached to the fluid cooler The platform shall be surrounded by an OSHA compliant guardrail system welded into subassemblies for ease of installa tion A permanently attached 1 6 wide aluminum ladder with 3 l beam side rails and 1 25 diameter serrated rungs shall extend from the base of the fluid cooler to the top of the guardrail Ladder Extension Add the following to the end of para graph 11 2 Provide a ladder extension for connection to the foot of the ladder This extension shall be long enough to rise from the roof grade level to the base of the fluid cooler The installing contractor shall be responsible for cut ting the ladder to length attaching it to the foot of the fluid cooler ladder and anchoring it at its base E Good maintenance practice requires periodic access to the top of the fluid cooler to inspect the distribution basins as well as the structural integrity of the fan deck fan guard fan cylinder and fan especially the fan blade securing hardware These models are large enough to accommodate this convenience For the comfort and safety of your operating personnel we recommend that you specify a ladd
29. llowing paragraph in the Access section An internal ladder shall extend upward from the plenum walkway to an elevated fiberglass bar grating platform convenient to the care and main tenance of the fluid cooler s mechanical equipment The platform shall be sur rounded by an OSHA compliant guardrail system welded into subassemblies for ease of installation Control Options Combination Fan and Pump Motor Starter Control Panel Add the following paragraph in the Mechanical Equipment section Each cell of the fluid cooler shall be equipped with a UL CUL 508 listed control panel in a NEMA 3R outdoor enclosure designed specifically for fluid cooler applications The panel shall include a main thermal magnetic circuit breaker disconnect with an external operat ing handle lockable in the off position for safety For fan operation use a full voltage non reversing magnetic starter controlled with a solid state temperature controller For spray pump operation use a full voltage non reversing magnetic starter with manual ON and OFF control via a door mounted selector switch The solid state device for fan control will display two temperatures one for outgo ing water and the other for set point tem perature Water temperature input shall be obtained using a three wire RTD with dry well located in the field outlet water piping Dry status contacts wired to user terminal points indicating typical alarm and status events shall be provided
30. may lead to an excessive scale buildup resulting in a decrease in efficiency A CAUTION Freezing ambient conditions could cause significant damage to the heat exchanger coil of the MH Fluid Cooler To avoid possible damage it is imperative to provide for adequate freeze protection MH Fluid Cooler Engineering Data Freeze Prevention FLUID COOLING RECIRCULATING WATER When the ambient air temperature falls below 32 F the recirculating water within the fluid cooler can freeze Marley Technical Report H 003 Cooling Towers and Freezing Weather describes how to prevent freezing during operation Ask your Marley sales representative for a copy or download a copy at spxcooling com During shutdown water collects in the basin and may freeze solid You can prevent freezing by adding heat to the water left in the basin or you can drain the tower and all exposed pipework at shutdown ELECTRIC BASIN HEATERS An automatic basin water heater system consisting of the following components Stainless steel electric immersion heater s Threaded couplings are provided in the side of the collection basin NEMA 4 enclosure containing Magnetic contactor to energize heater Transformer to convert power supply to 24 volts for control circuit Solid state circuit board for temperature and low water cutoff The enclosure may be mounted on the side of the fluid cooler Control probe in the collection basin to monitor wa
31. n does from the air intake face In many cases sound concerns are limited to nighttime when ambient sound levels are lower and neighbors are trying to sleep You can usually resolve these situations by variable speed drives and operating the fans at reduced speed after hours The natural nighttime reduction in wet bulb tempera ture makes this a very feasible solution in most areas of the world Variable speed drives automatically minimizes the tower s sound level during periods of reduced load and or reduced ambient temperature without sacrificing the sys tem s ability to maintain a constant cold water temperature This is a relatively inexpensive solution and can pay for itself quickly in reduced energy costs Where sound is a concern at all times for example near a hospital one pos sible solution is to oversize the tower so it can operate continuously at reduced motor speed even at the highest design wet bulb temperature Typical sound reductions are about 7 dB A at fan speed or 10 dB A at 1 2 fan speed but larger reductions may be possible MH Fluid Cooler Specifications Options 6 Specifications Specification Value Inlet Sound Attenuation Add the following paragraph in the Base section The fluid cooler shall be equipped with inlet sound attenuation baffles posi tioned and spaced vertically The baffles will be spaced across the entire length and extend the full height of the air inlet The
32. nd biological contaminants including Legionella an effective consistent water treatment program is required Simple blowdown may be adequate to control corrosion and scale but biological contamination can only be controlled with biocides An acceptable water treatment program must be compatible with the variety of materials incorporated in a fluid cooler ideally the pH of the recirculating water should fall between 6 5 and 9 0 Batch feeding of the chemicals directly into the fluid cooler is not a good practice since localized damage to the fluid cooler is possible Specific startup instructions and additional water quality recommendations can be found in the MH Fluid Cooler User Manual which accompanies the fluid cooler and also is available from your local Marley sales representative MH Fluid Cooler Specifications Base 9 Specifications Specification Value Base Provide an induced draft crossflow type factory assembled galvanized steel closed circuit fluid cooler Unit shall con sist of cell s as shown on plans The limiting overall dimensions of the fluid cooler shall be wide long and high to the top of the fan guard Total operating horsepower of all fans shall not exceed hp Fluid cooler shall be similar and equal in all respects to Marley Model Thermal Performance Water as the heat transfer fluid The fluid cooler shall be capable of cooling gpm of water from F to F at a design ente
33. ng of the coil during operation The basin components shall be installed and sealed at the fac tory and connected with bolted connec tions Tap screws shall not be allowed Copper Coil MHF7101 MHF7103 MHF7105 and MHF7107 models only Replace paragraph 4 1 with the following Copper coil tubes shall be 5 8 OD with type L headers Tubes shall be supported by stainless steel tube sheets with float ing tube design for long life Minimum design operating pressure shall be 300 psi Coil shall be warranted against any failure caused by defects in materials and workmanship for a period of eighteen 18 months from the date of shipment Stainless Steel Coil Replace paragraph 4 1 with the follow ing Coil s shall consist of fully welded box headers with serpentine tube circuits All coil components shall be assembled from series 300 stainless steel Minimum design operating pressure shall be 150 psi The coil s shall be designed for free drainage of fluid at shutdown Coil s shall be warranted against any failure caused by defects in materials and workmanship for a period of eighteen 18 months from the date of shipment IBi It would also be advisable to change the fill support tubes in Paragraph 8 1 from galvanized structural tubing to 300 stainless steel structural tubing E Copper coils offer many potential advantages over galvanized steel coils including superior corrosion resistance improved heat transfer reduced we
34. ngle winding 3 phase 60 hertz _____ volts Motors shall operate in the shaft vertical position for belt drive fluid coolers and in the shaft horizontal position for gear drive fluid coolers Nameplate power shall not be exceeded at design operation TEAO motors shall not be acceptable The fan and fan drive assembly for each cell shall be supported by a rigid galva nized steel structural support that resists misalignment The mechanical equipment assembly shall be warranted against any failure caused by defects in materi als and workmanship for no less than five 5 years following the date of fluid cooler shipment This warranty shall cover the fan s premium efficiency motor s geared speed reducer s drive shaft s and couplings and the mechanical equip ment support Bearing assemblies and V belts shall be warranted for 18 months Fill Louvers and Drift Eliminators Fill shall be film type thermoformed of heavy duty PVC with louvers and elimina tors formed integrally in each fill sheet Fill shall be suspended from galvanized structural tubing supported from the fluid cooler structure The air inlet face s of the fluid cooler shall be free of water splash out Coil air inlet louvers shall be a minimum of 0 D air travel triple pass PVC to limit water splash out and prevent direct sun light from entering the collection basin PVC louvers shall be easily removable for access to the coil s Louvers with les
35. on one and two cell installations only Maintenance considerations recommends this option be combined with the ladder and guardrail option on installations of three or more cells since the dipstick cannot be reached without accessing the fan deck E Extensions are available in 1 0 increments to a maximum height equal to the diameter of the fan Such extensions may be considered necessary in order to elevate the discharge beyond the bounds of an enclosure Discuss applicability with your local Marley sales representative SIPX SPX COOLING TECHNOLOGIES INC 7401 WEST 129 STREET OVERLAND PARK KANSAS 66213 USA P 913 664 7400 F 913 664 7439 spxcooling spx com spxcooling com gt Marley In the interest of technological progress all products are subject to design and or material change without notice ISSUED 04 2014 MHF TS 15 COPYRIGHT 2015 SPX Corporation
36. ovalguide com and conform to the FM Approval Standard for Cooling Towers Class Number 4930 that is approved for use without sprinkler systems The tower shall have successfully passed full scale fire testing static and cyclic wind pressure testing large missile impact testing for Zone HM and structural design evalu ation as administered by FM Approvals A copy of the FM Approval Certificate of Compliance dated November 2013 or later shall be available upon request Basin Sweeper Piping Add the following paragraph in the Cold Water Collection Basin section The cold water basin shall be equipped with factory installed corrosion resistant PVC sweeper piping with plastic nozzles The sweeper pip ing system shall be designed to force dirt and debris towards a dedicated drain in the depressed section of the collection basin Sound Control Add the following paragraph in the Base section The closed circuit fluid cooler shall be designed for quiet operation and shall produce an overall level of sound not higher than the overall dB A values shown in the following table when mea sured at a distance of ft Sound levels shall be measured with a Type 1 precision system and in full confor mance with ATC 128 test code published by the Cooling Technology Institute CTI The measurement system shall have a real time frequency analyzer and separate microphones with an overall tolerance 3 dB
37. r bacteria In areas prone to dust and sedimentation you should consider installing some means for keeping the collection basin clean Typical devices include side stream filters and a variety of filtration media BLOWDOWN Blowdown or Bleedoff is the continuous removal of a small portion of the water from the open recirculating system Blowdown is used to prevent the dissolved solids from concentrating to the point where they will form scale The amount of blowdown required depends on the cooling range the difference between the hot and cold water temperatures of the closed circuit and the composition of the makeup water The MH Fluid Cooler is equipped with a blowdown line with metering valve connected directly to the overflow Specific blowdown adjustment instructions and additional blowdown information can be found in the MH Fluid Cooler User Manual A CAUTION The fluid cooler must be located at such distance and direction to avoid the possibility of contaminated discharge air being 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 compliance with applicable air pollution fire and clean air codes MH Fluid Cooler Engineering Data Water Quality WATER TREATMENT To control the buildup of dissolved solids resulting from water evaporation as well as airborne impurities a
38. response to the tower cold water temperature A four wire RTD with dry well shall be furnished with the VFD and field installed into the cold water discharge pipe coming from the fluid cooler cell The tem perature of the cold water and set point shall be displayed on the door of the con trol panel The bypass starter shall be inte grated into the same enclosure as the VFD including complete circuitry to isolate the VFD when in the bypass mode To prevent heating problems in the fan motor the VFD system shall de energize the motor once 25 motor speed is reached and cooling is no longer required The VFD shall include deicing logic and manual control with the ability to reverse fan rotation including auto canceling with adjustable time Speed in deice mode shall not exceed 50 motor speed The manufacturer shall supply VFD start up assistance by a certified techni cian FIVE YEAR AVERAGE ENERGY COST 300 000 200 000 100 000 SINGLE WITH MARLEY SPEED MOTOR PREMIUM VFD 20 reduction in fan speed will typically save 50 of electrical energy eo MH Fluid Cooler Specifications Options 24 Specifications Specification Value Miscellaneous Options Positive Closure Dampers Hi Positive closure dampers give you the added security of safe operation in freez Add the following paragraph in the Coil section Provide positive closure actuat ing dampers to prevent air from flowing through the coil s
39. ring air wet bulb temperature of F Coil pressure drop shall not exceed psi The thermal performance rating shall be Certified by the Cooling Technology Institute and Eurovent Aqueous glycol solution as the heat transfer fluid The fluid cooler shall be capable of cool ing gpm of by volume ethylene propylene glycol solution from F to F at a design enter ing air wet bulb temperature of F Coil pressure drop shall not exceed psi The thermal performance rating shall be Certified by the Cooling Technology Institute and Eurovent The closed circuit cooling fluid cooler shall be capable of a minimum gpm hp efficiency per ASHRAE Standard 90 1 Heat loss from the fluid cooler shall be limited to ____ Btu h for the standard fluid cooler fluid cooler with positive clo sure dampers fluid cooler with positive closure dampers and insulation based on 50 F inlet fluid temperature and 10 F ambient temperature with 45 mph wind and fan s and pump s off IBi Your specification base establishes the type configuration base material and physical limitations of the fluid cooler to be quoted During the planning and lay out stages of your project you will have focused your attention on a fluid cooler selection that fits your space allotment and whose power usage is acceptable Limitations on physical size and total operating horsepower avoid the introduc tion of unforeseen operational and site related influence
40. s Specifying the num ber of cells and the maximum fan hp cell will work to your advantage The benefit of crossflow fluid coolers is that they are inherently easy to operate access and maintain Unlike counterflow fluid coolers crossflow fluid cool ers have a spacious plenum between banks of fill for easy access to all of the tower s internal components and the water distribution system is adjacent to the fan deck E Certification means that the fluid cooler has been tested under operating condi tions and found to perform as rated by the manufacturer under those circum stances lt assures the buyer that the tower is not intentionally or inadvertently undersized by the manufacturer The MH Fluid Cooler has been tested and per formance certified with water ethylene glycol solutions up to 50 concentration and propylene glycol solutions up to 50 concentration The minimum efficiency per ASHRAE Standard 90 1 2010 for axial fan closed circuit cooling towers applied to comfort cooling is 14 0 gpm hp at 102 F 90 F 75 F where hp is the sum of the fan motor nameplate power and the integral spray pump motor nameplate power If a greater efficiency is desired a higher ASHRAE Standard 90 1 gpm hp can be specified Each model s rating at ASHRAE Standard 90 1 conditions can be viewed in our online selection software at spxcooling com update EUROVENT CERTIFIED PERFORMANCE www eurovent certification com S MH Flui
41. s shall be mounted to the collection basin in conjunction with a suction assembly Recirculation piping shall be schedule 40 PVC A blowdown line with metering valve shall be con nected directly to the fluid cooler overflow Warranty The fluid cooler shall be free from defects in materials and workmanship for a period of eighteen 18 months from the date of shipment Location of the coil in the lower portion of the MH Fluid Cooler makes it much easier to access for cleaning and inspection D MH Fluid Cooler Specifications Options 15 Specifications Specification Value Alternate Material Options All Stainless Steel Fluid Cooler Replace paragraph 1 1 with the follow ing Provide an induced draft crossflow type factory assembled stainless steel closed circuit fluid cooler Unit shall con sist of cell s as shown on plans The limiting overall dimensions of the fluid cooler shall be wide long and high to the top of the fan guard Total operating horsepower of all fans shall not exceed hp Fluid cooler shall be similar and equal in all respects to Marley Model Replace paragraph 6 1 with the follow ing Except where otherwise specified all components of the fluid cooler shall be fabricated of heavy gauge 301L stain less steel Only low carbon stainless steel alloys will be accepted in order to mini mize the risk of intergranular corrosion in the weld zones The fluid cooler shall
42. s than three changes in air direction are unacceptable E The value of a 5 year mechanical equipment warranty speaks for itself IBi Louvers integral with the fill keep the flowing water within the confines of the fill The separate external louvers used by others permit water to escape the fill and form ice or produce an unsightly situation adjacent to the tower If you plan to use your tower in the wintertime particularly for free cooling integral louvers will put your operating concerns to rest o man _ MH Fluid Cooler Specifications Base 13 Specifications Drift eliminators shall be heavy duty PVC with a minimum of three changes in air direction and shall limit drift losses to 0 005 or less of the design recirculating water flow rate Distribution Basins An open basin above the fill with remov able interchangeable polypropylene nozzles installed in the floor of the basin shall provide full coverage of the fill by gravity flow Basin shall be installed and sealed at the factory and assembled with bolted connections Tap screws shall not be allowed The basins shall be equipped with removable galvanized steel cov ers capable of withstanding the loads described in paragraph 5 1 The water distribution system shall be accessible and maintainable during fan and water operation A redistribution basin below the fill with polypropylene nozzles installed in the floor of the basin shall provide full
43. shall be at or above the cold water basin overflow level and be equivalent material as the tower basin E To meet OSHA guidelines towers whose fan decks are 20 0 or more above roof or grade and which are equipped with ladders should have safety cages surrounding the ladders but with approximately 7 0 clear headroom E A galvanized steel self closing gate can be located at the guardrail level of the fan deck the exterior motor access platform and or the access door platform for enhanced fall protection Stainless steel is available with the stainless guardrail option For the comfort and safety of your operating personnel we recommend that you specify a self closing gate Many user s own safety rules may dictate these options E Where fluid coolers are installed on an elevated grillage or piers it is often dif ficult to get to and through the access door conveniently This platform pro vides easy safe and comfortable access to that door It also extends beyond the door to provide ready access to the optional Control System E A galvanized steel walkway enables easy access to inspect collection basin items such as the coil coil eliminators sump screen and make up valve and provides a dry working area to view and access the drive system nek cn MH Fluid Cooler Specifications Options 19 Specifications Specification Value Interior Mechanical Equipment Access Platform Plenum walkway required Add the fo
44. stems used by others are extremely awkward to access and maintain Ili Manufacturers who use materials other than heavy gauge steel for fan decks may be unable to meet your specified loading requirements Fan decks on the larger models MHF 7111 and MHF7113 are designed to be used as a work ing platform E Access doors on other manufacturer s towers may be 18 wide or smaller which is unreasonably small for a human being Specifying the size of the door will cause those bidders to take exception alerting you to a potential mainte nance headache Two doors are standard on all MH Fluid Coolers one in each endwall io ask SS _ o go MH Fluid Cooler Specifications Base 14 Specifications Specification Value Collection Basin The collection basin shall be G 235 heavy gauge galvanized steel assembled with bolted connections Tap screws shall not be allowed Suction connections shall be equipped with galvanized debris screens A factory installed float operat ed mechanical makeup valve and waste water blowdown line shall be included An overflow and drain connection shall be provided in each cell of the fluid cooler The basin shall include a depressed section into which accumulated particle debris can be flushed to permit cleaning The basin floor adjacent to the depressed section shall slope toward the depressed section to prevent buildup of debris under the coil area Recirculation pump
45. t shall be adjust able for sensitivity and include a means to reset the switch Basin Heater Add the following paragraph in the Cold Water Basin section Provide a system of electric immersion heaters and controls for each cell of the fluid cooler to prevent freezing of water in the collection basin during periods of shutdown The system shall consist of one or more stainless E Unless specified otherwise a Marley M 5 vibra tion switch will be provided The requirement for manual reset assures that the fluid cooler will be visited to determine the cause of exces sive vibration E The Marley basin heater components described at left represent our recommendation for a reliable automatic system for the preven tion of basin freezing They are normally shipped separately for installation at the jobsite by the installing contractor When purchased in conjunction with the enhanced Control System option however they are customarily factory mounted and tested k SS MH Fluid Cooler Specifications Options 21 Specifications Specification Value steel electric immersion heaters installed in threaded couplings provided in the side of the basin A NEMA 4 enclosure shall house a magnetic contactor to energize heaters a transformer to provide 24 volt control circuit power and a solid state cir cuit board for temperature and low water cut off A control probe shall be located in the basin to monitor water level and
46. tem perature Recirculating pump s shall be fitted with heat trace cable and insulated The system shall be capable of maintain ing 40 F water temperature at an ambient air temperature of SE Water Level Control System Add the following paragraph in the Cold Water Basin section Provide a water level control system including a NEMA 4X control panel water level probes and probe stilling chamber The control system shall monitor the water level in the cold water basin to determine level events used for cold water make up high and low alarms and or pump shut down The control panel shall use electromechanical relays providing power for the make up solenoid and electrical contacts for alarm and pump shutdown control circuits Probes shall be contained in a vertical stilling chamber to stabilize the water in the cold water basin Probes shall have replaceable stainless steel tips and level height shall be field adjustable Fan Motor Variable Speed Drive ACH550 VFD System Add the following paragraph in the Mechanical Equipment section when VFD is used with customers Building Management System For fan control a complete UL listed variable speed drive system in a NEMA 1 indoor NEMA 12 indoor or NEMA 3R outdoor enclosure shall be provided The VFD shall use PWM technology with IGBT switching VFD out put switching signal shall be programmed to not cause mechanical vibration issues with backlash in gearbox teeth or vibration
47. ter temperature and level The basin heater option is only for freeze protection of the recirculation water in collection basin The basin heater option does not protect the coil during freezing weather Heater components are normally shipped separately for installation by others INDOOR STORAGE TANK With this type of system water flows from an indoor tank and back to the tower where it is cooled and recirculated The water flows by gravity from the fluid cooler to the tank located in a heated space At shutdown all exposed water drains into the tank where it is safe from freezing The amount of water needed to successfully operate the system depends on the fluid cooler size on volume of water contained in the piping system to and from the tower You must select a tank large enough to contain those combined volumes plus a level sufficient to maintain a flooded suction on your pump Control makeup water according to the level where the tank stabilizes during operation SYSTEM CLEANLINESS The MH Fluid Cooler can be a very effective air washer Atmospheric dust able to pass through the relatively small louver openings will enter the recirculating water system Increased concentrations can intensify systems maintenance by clogging screens and strainers and smaller particulates can coat system heat transfer surfaces In areas of low flow velocity such as the collection basin sedimentary deposits can provide a breeding ground fo
48. to withstand shipping and hoisting loads of 2g horizontal or 3g vertical The fan deck and hot water basin covers on doubleflow models shall be designed for 50 psf live load or a 200 lb concentrated load Guardrails where specified shall be capable of withstand ing a 200 lb concentrated live load in any direction and shall be designed in accor dance with OSHA guidelines E The MH Fluid Cooler coil is suit E However certification alone is not sufficient to assure you that the fluid cooler will perform satisfactorily in your situation Certification is established under rel atively controlled conditions and fluid coolers seldom operate under such ideal circumstances They are affected by nearby structures machinery enclosures effluent from other sources etc Responsible and knowledgeable bidders will take such site specific effects into consideration in selecting the fluid cooler but the specifier must insist by the written specification that the designer manu facturer guarantee this real world performance Any reluctance on the part of the bidder should cause you some concern able for cooling water oils and other fluids compatible with carbon steel in a closed pressurized system Each coil is constructed of all prime surface continu ous steel tubing formed into a serpentine shape and welded into an assembly The complete assembly is then hot dip galvanized after fabrication Tubes are sloped to provide
49. um fan tip speed shall be 10 000 ft min Fan s shall be driven through a one piece multi groove solid back V type belt sheaves pulleys and tapered roller or deep groove ball bearings Bearings shall be rated at an Ly qa life of 90 000 hours or greater Both motor and fan sheaves pulleys shall be all cast alu minum to prevent premature corrosion E For more severe cases requiring the lowest possible sound levels inlet sound attenuator sections and or the Marley Ultra Quiet fan may offer additional sound reduction The Ultra Quiet fan is available on MHF7107 MHF7109 MHF7111 and MHF7113 models only Tower dimensions may increase slightly obtain current sales drawings from your Marley sales representative for accu rate dimensions Marley Ultra Quiet Fan MH Fluid Cooler Specifications Options 7 Specifications Specification Value Dry Cooling Operation Not available on MHF7101 and MHF7109 models Models MHF7103 MHF7105 and MHF7107 Add the following in the Coil section An extended surface tube bundle shall be included in the plenum section of the fluid cooler to enable part load seasonal dry operation The finned tube bundle shall be constructed of fully welded box headers and finned tube cir cuits and shall be hot dip galvanized after fabrication Minimum design operating pressure shall be 150 psi The coil shall be warranted against any failure caused by defects in materials and workmanship
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