SPX Cooling Technologies Humidifier 7012D081 7012H121 User Manual

Marley MC Fluid Cooler  
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Engineering Data & Specifications  
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Marley MC Fluid Cooler  
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3
Air Movement Package  
Forward-curved centrifugal fans are dynamically balanced and mounted on tubular steel shafts.  
Fans are supported by roller-bearings mounted at both ends with heavy-guage steel supports.  
Spherical roller bearings are rated at an L10 life of 50,000 hours.  
Fan guard / Air-inlet screens are 16 gauge galvanized steel.  
TEFC Fan Motor—1.15 service factor, variable torque, and specially insulated for fluid cooler duty.  
The MC Fluid Cooler air movement package including the structural support—guaranteed against failure for  
a period of five full years. The motor is warranted separately by the motor manufacturer.  
Water Distribution System  
Pressurized spray system distributes water evenly over the coil. Steel header box with PVC branch arms.  
Low-clog polypropylene nozzles—delivers precise distribution of water over the coil area.  
Marley's hot-dipped galvanized coil is tested at 2757 kPa to ensure integrity and sloped to ensure total  
drainage at shutdown  
Marley XCEL drift eliminators—limit drift losses to no more than .005% of the design m3/hr flow rate.  
Structure  
Forced-draft, counter-flow design requires considerably less plan area than crossflow fluid coolers typically use.  
Series 300 stainless steel or heavy mill galvanized steel construction.  
Factory assembled—ensures final field installation will be hassle-free.  
Centrifugal fans and a fully-enclosed falling water area create one of the quietest fluid cooler configurations on  
the market.  
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Marley MC Fluid Cooler  
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4
The Marley MC Fluid Cooler is particularly suited  
to the urban environment, reducing noise while  
increasing energy efficiency and performance.  
By keeping the process fluid in a clean, closed  
loop, and combining the function of a cooling  
tower and heat exchanger into one system, they  
provide superior operational and maintenance  
benefits.  
Pages 17 thru 20 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 maintenance-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.  
The specifications portion of this publication not  
only relates the language to use in describing an  
appropriate MC 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 17 thru 26 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 21 thru 26 provide paragraphs intended to  
add those features, components and materials  
that will customize the fluid cooler to meet the  
user‘s requirements.  
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Marley MC Fluid Cooler Engineering Data : Schematic  
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5
Use this data for preliminary layouts only.  
Obtain current drawing from your Marley sales  
representative.  
The UPDATE web-based selection software  
MC Fluid Cooler model recommendations based  
on customer's specific design requirements.  
108  
1249  
1829  
4" INLET  
C
H
4" OUTLET  
INSTALLED  
HEIGHT  
ACCESS  
ACCESS  
1448  
279  
SIDE ELEVATION  
AIR INLET ELEVATION  
ALL MODELS  
MODELS 7012D081 - 7012H121  
108  
3654  
108  
2740  
C
H
INSTALLED  
HEIGHT  
1448  
279  
279  
AIR INLET ELEVATION  
AIR INLET ELEVATION  
MODELS 7013F081 - 7013J121  
MODELS 7014H081 - 7014K121  
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Marley MC Fluid Cooler Engineering Data : Schematic  
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6
Dimensions  
Shipping Weight kg  
Operating  
Weight  
kg  
Motor  
kW  
Pump  
kW  
Model  
Heaviest  
H
C
Weight per Cell  
Section  
7012D081  
7012F081  
7012H081  
7012D101  
7012F101  
7012H101  
7012D121  
7012F121  
7012H121  
7013F081  
7013H081  
7013J081  
7013F101  
7013H101  
7013J101  
7013F121  
7013H121  
7013J121  
7014H081  
7014J081  
7014K081  
7014H101  
7014J101  
7014K101  
7014H121  
7014J121  
7014K121  
2.2  
3.7  
5.6  
2.2  
3.7  
5.6  
2.2  
3.7  
5.6  
3.7  
5.6  
7. 5  
2832  
813  
1041  
1270  
813  
.4  
.4  
1628  
1854  
2037  
2207  
2448  
2696  
2789  
3098  
3409  
1412  
977  
3061  
3289  
2832  
3061  
3289  
2832  
3061  
3289  
1583  
1754  
1830  
2060  
2290  
2299  
2587  
2875  
1148  
1320  
1278  
1509  
1739  
1600  
1887  
2176  
.4  
.6  
3.7  
5.6  
7. 5  
1041  
1270  
813  
.6  
3.7  
5.6  
7. 5  
.6  
5.6  
7. 5  
.75  
.75  
.75  
11.2  
5.6  
7. 5  
1041  
1270  
11.2  
5.6  
7. 5  
11.2  
NOTE  
1 Use this bulletin for preliminary layouts only. Obtain  
current drawings from your Marley sales representative.  
All table data is per cell.  
2 Standard overflow is a 2" dia. F connection located  
on the side of the collection basin. Makeup water  
connection is a 1" dia. M connection located on the side  
of the collection basin. Drain is a 2"F connection located  
on the side of the collection basin.  
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Marley MC Fluid Cooler Engineering Data : Schematic  
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7
Use this data for preliminary layouts only.  
Obtain current drawing from your Marley sales  
representative.  
The UPDATE web-based selection software  
MC Fluid Cooler model recommendations based  
on customer's specific design requirements.  
110  
3550  
2400  
1132  
633  
4" INLETS  
4" OUTLETS  
C
H
INSTALLED  
HEIGHT  
ACCESS  
2737  
ACCESS  
511  
AIR INLET ELEVATION  
SIDE ELEVATION  
MODELS 7054L081 - 7054Q121  
ALL MODELS  
110  
5378  
C
H
INSTALLED  
HEIGHT  
2737  
621  
AIR INLET ELEVATION  
MODELS 7055P081 - 7055R121  
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Marley MC Fluid Cooler Engineering Data : Schematic  
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8
Dimensions  
Shipping Weight kg  
Operating  
Weight  
kg  
Motor  
kW  
Pump  
kW  
Model  
Heaviest  
H
C
Weight per Cell  
Section  
7054L081  
7054M081  
7054N081  
7054P081  
7054Q081  
7054L101  
7054M101  
7054N101  
7054P101  
7054Q101  
7054L121  
7054M121  
7054N121  
7054P121  
7054Q121  
7055P081  
7055Q081  
7055R081  
7055P101  
7055Q101  
7055R101  
7055P121  
7055Q121  
7055R121  
15  
18.6  
4172  
813  
1041  
1270  
22.4  
2.2  
2.2  
2.2  
5749  
6351  
6868  
4105  
2920  
29.8  
37.3  
15  
18.6  
4400  
4629  
22.4  
4658  
5128  
3472  
3942  
29.8  
37.3  
15  
18.6  
22.4  
29.8  
37.3  
15 x 2  
18.6 x 2  
22.4 x 2  
15 x 2  
18.6 x 2  
22.4 x 2  
15 x 2  
18.6 x 2  
22.4 x 2  
4172  
4400  
4629  
813  
1041  
1270  
3.7  
3.7  
3.7  
8010  
8847  
9647  
5558  
6323  
7088  
8644  
3921  
5449  
NOTE  
1 Use this bulletin for preliminary layouts only. Obtain  
current drawings from your Marley sales representative.  
All table data is per cell.  
2 Standard overflow is a 2" dia. F connection located  
on the side of the collection basin. Makeup water  
connection is a 1" dia. M connection located on the side  
of the collection basin. Drain is a 2"F connection located  
on the side of the collection basin.  
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Marley MC Fluid Cooler Engineering Data : Schematic  
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9
Use this data for preliminary layouts only.  
Obtain current drawing from your Marley sales  
representative.  
The UPDATE web-based selection software  
MC Fluid Cooler model recommendations based  
on customer's specific design requirements.  
2980  
1480  
2680  
110  
772  
4" INLETS  
C
4" OUTLETS  
H
INSTALLED  
HEIGHT  
ACCESS  
2737  
ACCESS  
508  
SIDE ELEVATION  
AIR INLET ELEVATION  
ALL MODELS  
MODELS 7073M081 - 7073P121  
110  
5359  
110  
3683  
C
H
INSTALLED  
HEIGHT  
2737  
533  
670  
AIR INLET ELEVATION  
AIR INLET ELEVATION  
MODELS 7074N081 - 7074Q121  
MODELS 7075Q081 - 7075T121  
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Marley MC Fluid Cooler Engineering Data : Schematic  
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10  
Dimensions  
Shipping Weight kg  
Operating  
Weight  
kg  
Motor  
kW  
Pump  
kW  
Model  
Heaviest  
H
C
Weight per Cell  
Section  
7073M081  
7073N081  
7073P081  
7073M101  
7073N101  
7073P101  
7073M121  
7073N121  
7073P121  
7074N081  
7074P081  
7074Q081  
7074N101  
7074P101  
7074Q101  
7074N121  
7074P121  
7074Q121  
7075Q081  
7075R081  
7075T081  
7075Q101  
7075R101  
7075T101  
7075Q121  
7075R121  
7075T121  
18.6  
22.4  
4174  
813  
1041  
1270  
813  
2.2  
2.2  
2.2  
3.7  
3.7  
3.7  
5.6  
5.6  
5.6  
6190  
6769  
7351  
7855  
8598  
9337  
10986  
11927  
12852  
4541  
2930  
29.8  
18.6  
4402  
4613  
4174  
4402  
4613  
4174  
4402  
4613  
22.4  
5074  
5608  
5619  
6299  
6977  
7674  
8615  
9451  
3463  
3997  
3549  
4229  
4907  
4769  
5710  
6546  
29.8  
18.6  
22.4  
29.8  
22.4  
29.8  
37.3  
22.4  
1041  
1270  
813  
29.8  
37.3  
22.4  
29.8  
37.3  
18.6 x 2  
22.4 x 2  
29.8 x 2  
18.6 x 2  
22.4 x 2  
29.8 x 2  
18.6 x 2  
22.4 x 2  
29.8 x 2  
1041  
1270  
NOTE  
1 Use this bulletin for preliminary layouts only. Obtain  
current drawings from your Marley sales representative.  
All table data is per cell.  
2 Standard overflow is a 112" dia. M connection located on  
the side of the collection basin. Makeup water connection  
may be 112" dia. M connection located on the side of the  
collection basin. Drain is a 2"F connection located on the  
side of the collection basin.  
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Marley MC Fluid Cooler Engineering Data: Support  
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11  
LENGTH  
C
A
C
C
C
ANCHOR  
BOLT  
ANCHOR  
BOLT  
L
L
21  
A
Model  
7012  
7013  
7014  
A
B
C
HOLES FOR  
3/8" DIA. ANCHOR  
1519  
2432  
BOLTS 4 REQD  
1210  
152  
3343  
7054  
7055  
7073  
7074  
7075  
3510  
5353  
2640  
3640  
5320  
B
2361  
2931  
24  
21  
SUPPORT  
BY OTHERS  
NORMAL  
GAUGE  
30  
TOWER COLLECTION  
BASIN- AIR INLET FACE  
VIEW A  
SUPPORTING STEEL  
SINGLE CELL  
NOTE  
1 Use this bulletin for preliminary layouts only. Obtain  
current drawings from your Marley sales representative  
for final design.  
3 Continuous beam required for entire length.  
4 Fluid cooler may be placed on a flat concrete slab.  
2 Purchaser to provide fluid cooler support complete with  
holes and anchor bolts. Do not use studs! Anchor points  
must be framed flush and level at top.  
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Marley MC Fluid Cooler Engineering Data : Hoisting  
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12  
B
A
80°MAX  
D
C
Lower Module  
B
Upper Module  
D
Model  
Weight  
kg  
Weight  
kg  
A
C
7012  
7013  
7014  
7054  
7055  
7073  
7074  
7075  
1422  
2337  
3302  
1245  
3073  
2515  
1295  
2743  
1143  
1143  
1143  
2057  
2057  
2794  
2642  
2642  
435  
549  
1600  
2515  
3429  
3327  
1753  
2515  
3531  
5207  
1143  
1143  
1143  
2438  
2438  
2794  
2794  
2794  
1320  
1740  
2175  
3942  
5450  
3996  
4908  
6545  
699  
1186  
1640  
1610  
2071  
2905  
NOTE  
1 Hoisting operations can be dangerous and suitable safety  
precautions should be taken to protect personnel and the  
equipment being hoisted.  
2 All hoisting equipment should be certified and comply with  
local and national safety regulations.  
3 Ensure that slings are of sufficient length so not to impose  
bending loads onto the casing—use of spreader bars is  
essential.  
4 For overhead lifts or where additional safety is required,  
add slings beneath the fluid cooler unit.  
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Marley MC Fluid Cooler Engineering Data : Schematic : Attenuators  
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13  
E
A
D
C
SIDE ELEVATION  
AIR INLET ELEVATION  
B
ALL MODELS  
Dimensions  
Model  
Depth  
A
B
C
D
E
610  
1220  
610  
1824  
1824  
2735  
2735  
3648  
3648  
3550  
3550  
5202  
5202  
2680  
2680  
3680  
3680  
5359  
5359  
110 0  
1700  
110 0  
1700  
110 0  
1700  
110 0  
1700  
110 0  
1700  
110 0  
1700  
110 0  
1700  
110 0  
1700  
1113  
1113  
1113  
1113  
1113  
1113  
2121  
2121  
2121  
2121  
2121  
2121  
2121  
2121  
2121  
2121  
1126  
1726  
1126  
1726  
1126  
1726  
1126  
1726  
1126  
1726  
1126  
1726  
1126  
1726  
1126  
1726  
1251  
1251  
1251  
1251  
1251  
1251  
2400  
2400  
2400  
2400  
2980  
2980  
2980  
2980  
2980  
2980  
7012  
7013  
7014  
7054  
7055  
7073  
7074  
7075  
1220  
610  
1220  
610  
1220  
610  
1220  
610  
1220  
610  
1220  
610  
1220  
NOTE  
1 Attentuators will result in an additional external resistance  
therefore the fan will be unable to deliver the same airflow  
resulting in a small reduction in performance.  
2 Critical noise applications must be referred to SPX Cooling  
Technologies engineering.  
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Marley MC Fluid Cooler Engineering Data: Freeze Prevention  
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14  
Fluid Cooler Coil  
Fluid Cooling Recirculating Water  
When the ambient temperature falls below 0°C,  
heat loss from the coil can be substantial even without  
recirculating water flowing over the coil. The process  
fluid, without an applied heat load, may be prone to  
freezing. There are various methods to protect against  
coil freezing.  
When the ambient air temperature falls below 0°C,  
the recirculating water within the fluid cooler can freeze.  
Marley Technical Report #H-003 “Operating Cooling  
Towers in Freezing Weather” describes how to  
prevent freezing during operation. Ask your Marley sales  
representative for a copy or download a copy at  
spxcooling.com.  
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.  
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 fluid  
cooler and all exposed pipework at shutdown.  
Electric Basin Heaters  
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 7°C 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.  
An automatic basin water heater system, consisting of  
the following components:  
• Standard weatherproof (IP55) enclosure, rating  
depending on model and minimum expected winter  
temperature (see table below):  
• Ratings are in kW for specified ambient temperature.  
For lower ambient temperatures refer to SPX  
engineering for advice.  
Draining the coil is not considered to be an acceptable  
means of protection against freezing. Introducing air to  
the interior of the bundle will promote corrosion of the  
heat exchanger coil. In an emergency, this alternative can  
be used in the event that the process fluid drops below  
7°C, the ambient temperature is below freezing and the  
coils are not protected with industrial antifreeze.  
• Standard electircal supply is 380/415 V 3ph (220/240V 1  
ph available as extra cost option).  
• Heater has an integral thermostat, set point nominally  
3°C but adjustable to suit operating requirements.  
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.  
Cycling of the recirculating water pumps should not be  
used to control process flow temperatures. Coils may be  
used for seasonal dry operation followed by seasonal wet  
operation, but not for frequent cycling of the recirculating  
water pump. Such operation may lead to an excessive  
scale buildup resulting in a decrease in efficiency.  
Heater components are normally shipped separately  
for installation by others.  
Indoor StorageTank  
With this type of system, water flows from an indoor  
tank and back to the fluid cooler 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.  
CAUTION  
Freezing ambient conditions could cause significant  
damage to the heat exchanger coil of the MC Fluid  
Cooler.To avoid possible damage, it is imperative to  
provide for adequate freeze protection.  
The amount of water needed to successfully operate  
the system depends on the fluid cooler size and m3/hr  
and on the volume of water contained in the piping  
system to and from the fluid cooler. 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.  
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Marley MC Fluid Cooler Engineering Data:Water Quality  
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15  
The MC 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 for bacteria.  
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 certify that the location  
of the fluid cooler is in compliance with applicable air  
pollution, fire and clean air codes.  
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  
WaterTreatment  
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 MC 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 MC Fluid Cooler  
User Manual .  
To control the buildup of dissolved solids resulting  
from water evaporation, as well as airborne impurities and  
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  
MC Fluid Cooler User Manual which accompanies the  
fluid cooler and also is available from your local Marley  
sales representative.  
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Marley MC Fluid Cooler Specifications: Base  
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/
16  
Specifications  
Specification Value  
1.0  
1.1  
Base:  
Your specification base establishes the type, configuration, base  
material and physical limitations of the fluid cooler to be quoted.  
During the planning and layout 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 kW avoid the introduction of unfore-  
seen operational and site-related influences. Specifying the number of  
cells, and the maximum fan kW/cell will work to your advantage.  
Furnish and install a forced-draft, coun-  
terflow-type, factory assembled, film  
fill, industrial duty, galvanized steel,  
closed circuit fluid cooler. Unit shall  
consist of _____ cell(s), as shown on  
plans. The limiting overall dimensions  
of the fluid cooler shall be _____ wide,  
_____ long, and _____ high. Total oper-  
ating kW of all fans shall not exceed  
_____ kW, consisting of_____ @ _____  
kW motor(s). Fluid cooler shall be simi-  
lar and equal in all respects to Marley  
Model _____________________.  
The benefit of a forced-draft counterflow fluid cooler is that they  
are inherently easy to operate, access and maintain. Forced-draft  
counterflow fluid coolers have all mechanical equipment located at a  
low level for easy access, and the water distribution system is acces-  
sible by simply removing the lightweight drift eliminator panels  
CTI Certification means that the fluid cooler has been tested under  
operating conditions and found to perform as rated by the manufac-  
turer under those circumstances. It  
assures the buyer that the fluid cooler  
is not intentionally or inadvertently  
2.0  
2.1  
Thermal Performance:  
Water as the heat transfer fluid.  
The fluid cooler shall be capable of  
cooling _____ m3/hr of water from  
_____ °C to _____ °C at a design enter-  
ing air wet-bulb temperature of _____  
°C. Coil pressure drop shall not exceed  
_____ kPa. The thermal performance  
rating shall be Certified by the Cooling  
Technology Institute.  
undersized by the manufacturer.  
2.1  
Aqueous glycol solution as the heat  
transfer fluid.  
The fluid cooler shall be capable of  
cooling _____ m3/hr of water from  
_____ °C to _____ °C at a design enter-  
ing air wet-bulb temperature of _____  
°C. Coil pressure drop shall not exceed  
_____ kPa. The thermal performance  
rating shall be based on the Cooling  
Technology Institute certified perfor-  
mance rating adjusted for the thermal  
properties of the aqueous glycol solu-  
tion used.  
3.0  
3.1  
Performance Warranty:  
However, CTI certification alone is not sufficient to assure you that the  
fluid cooler will perform satisfactorily in your situation. Certification  
is established under relatively 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-spe-  
cific effects into consideration in selecting the fluid cooler—but the  
specifier must insist by the written specification that the designer/  
manufacturer guarantee this “real world” performance. Any reluc-  
tance on the part of the bidder should cause you some concern.  
CTI Certification notwithstanding, the  
fluid cooler manufacturer shall guaran-  
tee that the fluid cooler supplied will  
meet the specified performance condi-  
tions when the fluid cooler is installed  
according to plan. If, 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,  
disinterested third party in accordance  
with CTI 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  
manufacturer will pay for the cost of  
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Marley MC Fluid Cooler Specifications: Base  
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Specifications  
Specification Value  
the test and will make such corrections  
as are appropriate and agreeable to the  
owner to compensate for the perfor-  
mance deficiency.  
4.0  
4.1  
Coil:  
The MC Fluid Cooler  
coil is suitable for cool-  
ing water, oils and other  
fluids compatible with  
carbon steel in a closed,  
pressurized system. Each  
coil is constructed of all-  
prime surface, continu-  
Coil(s) shall consist of fully welded box  
headers with serpentine coils and hot-dip  
galvanized after fabrication. Coils shall  
be tested to 2757 kPa air pressure while  
immersed in water. Maximum operating  
design pressure shall be 1551 kPa. The  
coil shall be designed for free drainages  
of fluid at shutdown.  
ous steel tubing, formed  
into a serpentine shape  
5.0  
5.1  
Design Loading:  
and welded into an assembly.The complete assembly is then hot-dip  
galvanized after fabrication. Design pressure is 1551 kPa, and each coil  
is tested to 2757 kPa air pressure under water.Tubes are sloped to pro-  
vide free drainage when vented.  
The fluid cooler and its components  
shall be designed to withstand a wind  
load of 1.44 kPa. The fluid cooler shall  
be designed to withstand shipping  
and hoisting loads of 2g horizontal or  
3g vertical. Handrails, where specified  
shall be capable of withstanding a 890  
N concentrated live load in any direc-  
tion and shall be designed in accor-  
dance with OSHA guidelines.  
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 MC Series models will with-  
stand significantly higher wind and seismic 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.  
6.0  
6.1  
Construction:  
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 of success.  
Except where otherwise specified, all  
components of the fluid cooler shall  
be fabricated of heavy-gauge steel,  
protected against corrosion by G600  
galvanizing. After passivation of the  
galvanized steel (8 weeks at pH 7-8,  
and calcium hardness and alkalinity at  
100-300 mg/L 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 mg/L as NaCl (300  
mg/L as Cl-); a sulfate content (as SO4)  
up to 250 mg/L; a calcium content (as  
CaCO3) up to 500 mg/L; silica (as SiO2)  
up to 150 mg/L; and design operat-  
ing ranges up to 10°C. The circulating  
water shall contain no oil, grease, fatty  
acids, or organic solvents.  
If extended longevity of the fluid cooler is required—or unusually  
harsh operating conditions are expected—consider specifying stain-  
less steel as either the base construction material, or the material  
utilized for specific components of your choice. See Stainless Steel  
Options on page 17.  
6.2  
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 paragraph 4.1. They are to be  
regarded as minimum requirements.  
Where component materials unique  
to individual fluid cooler designs are  
not specified, the manufacturers shall  
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Marley MC Fluid Cooler Specifications: Base  
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Specifications  
Specification Value  
take the above water quality and load  
carrying capabilities into account in the  
selection of their materials of manufac-  
ture.  
7.0  
7.1  
Mechanical Equipment:  
Fan(s) shall be forward curved cen-  
trifugal-type, which are statically and  
dynamically balanced. The fan impeller  
is manufactured from galvanized steel,  
blades are riveted to the center plate  
and inlet rings and have stay rods to  
ensure maximum concentricity and  
rigidity. The stay rods are adjusted by  
the manufacturer during the balancing  
operation and require no field adjust-  
ment. Fan(s) shall be driven through  
one-piece, multi-groove, V-belt, pulleys,  
and spherical roller bearings. Bearings  
shall be rated at an L10 life of 50,000  
hours, or greater. A hinged motor  
adjustment plate with threaded ten-  
sioning bolts shall be installed to allow  
correct belt tensioning.  
The Marley drive system features all-aluminum sheaves (pulleys),  
power band belts, and long-life bearings for dependable service.  
To reduce cost, some manufacturers may useTEAO motors, whose  
only source of cooling is the flow of air produced by the fluid cooler  
fan.They are sometimes applied at kWs significantly beyond their  
nameplate rating.  
Unless otherwise specified, motor speed will be 1500 RPM, 50 Hertz  
on standard models. If you prefer the operating flexibility of two-  
speed operation, please specify two-speed, single-winding motors  
which offer full and half speeds for maximum energy savings.  
Incidentally, two speed motors are a far better choice than separate  
“pony” motors which simply double the problems indicated above.  
The value of a 5 year mechanical equipment warranty speaks for  
itself.  
7.2  
Motor(s) shall be ____ kW maximum,  
Totally Enclosed, 1.15 service fac-  
tor, variable torque, and specially  
insulated for fluid cooler duty. Speed  
and electrical characteristics shall be  
______ RPM, single-winding, 3 phase,  
50 hertz, ____ volts. Motor shall oper-  
ate in the shaft-horizontal position and  
nameplate kW shall not be exceeded  
at design operation  
7.3  
The complete mechanical equipment  
assembly for each cell shall be sup-  
ported by a rigid, galvanized steel  
structural support that resists misalign-  
ment between the motor and sheaves.  
The mechanical equipment assembly  
shall be warranted against any failure  
caused by defects in materials and  
workmanship for no less than five (5)  
years following the date of fluid cooler  
shipment. This warranty is limited to  
the fan, fan shaft, bearings, sheaves  
and mechanical equipment support.  
The motor, motor components and  
belt(s) are warranted by their manufac-  
turer.  
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Marley MC Fluid Cooler Specifications: Base  
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Specifications  
Drift Eliminators:  
Specification Value  
8.0  
8.1  
Drift rate varies with design water loading and air rate, as well as drift  
eliminator depth and number of directional changes.The indicated  
rate of 0.005% is easily achievable without premium cost. If a lower  
rate is required, please discuss with your Marley sales representative.  
Drift eliminators shall be PVC, triple  
pass and shall limit drift losses to no  
more than 0.005% of the design water  
flow rate.  
9.0  
9.1  
Hot Water Distribution System:  
The combination of PVC piping and polypropylene nozzles is very  
resistant to the build-up of scale and slime.  
A pressured spray system shall distrib-  
ute water evenly over the fill. Header  
box shall be steel and branch arms  
shall be PVC with polypropylene spray  
nozzles attached to the branch arms by  
an integral screw connection for ease  
of removal and cleaning. The spray  
system shall provide full coverage  
of the coil at a flow rate sufficient to  
ensure complete wetting of the coil at  
all times.  
10.0 Casing:  
10.1 The casing shall be heavy gauge G-600  
galvanized steel and shall be capable  
of withstanding the loads described in  
paragraph 5.1.  
11.0 Access:  
11.1 A large galvanized, rectangular access  
door shall be located on both end  
panels for entry into the cold water  
basin. Rectangular panels are shall be  
provided for access to the fan plenum  
area to facilitate inspection and allow  
maintenance to the fan drive system  
12.0 Cold Water Collection Basin:  
The MC fluid cooler design offers side-suction as standard. Bottom  
outlets may be supplied to accommodate a variety of piping schemes.  
Unless so specified, the fluid cooler you may be asked to approve  
may only be available with one type of suction connection requiring  
you to redesign your piping layout.  
12.1 The collection basin shall be heavy-  
gauge galvanized steel and shall  
include the number and type of suction  
connections required to accommodate  
the out-flow piping system shown on  
the plans. Suction connections shall be  
equipped with debris screens. A fac-  
tory installed, float operated, mechani-  
cal make-up valve shall be included. An  
overflow and drain connection shall be  
provided in each cell of the fluid cooler.  
The basin floor shall slope toward the  
drain to allow complete flush out of  
debris and silt which may accumulate.  
The sloping floor and low-level drain is valuable because it provides a  
way to achieve flush-out cleanability.  
13.0 Warranty:  
13.1 The MC Fluid Cooler shall be free from  
defects in materials and workmanship  
for a period of eighteen (18) months  
from the date of shipment.  
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Marley MC Fluid Cooler Specifications: Options  
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Specifications  
Specification Value  
Stainless Steel Options  
The cold water basin is the only part of the fluid cooler that is subject  
to periods of stagnant water, concentrated with treatment chemicals  
and customary contaminants. It is also the most expensive and dif-  
ficult part of any fluid cooler to repair or replace. For these reasons,  
many customers—particularly those who are replacing older fluid  
coolers—choose to specify stainless steel cold water basins.  
Stainless Steel Collection Basin:  
12.1: Replace paragraph 12.1 with the  
following: The collection basin shall  
be heavy-gauge Series 300 stainless  
steel. Suction connections shall be  
equipped with stainless steel debris  
screens. A factory installed, float oper-  
ated, mechanical make-up valve shall  
be included. An overflow and drain  
connection shall be provided in each  
cell of the fluid cooler. The basin floor  
shall slope toward the drain to allow  
complete flush out of debris and silt  
which may accumulate. All steel items  
which project into the basin (anchor  
clips, etc.) shall also be made of stain-  
less steel.  
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 electostatically-applied coatings, however exotic  
they may be, can match stainless steel's ability to withstand adverse  
operating conditions.  
All Stainless Fluid cooler  
6.1  
Replace paragraph 6.1 with the fol-  
lowing: Except where otherwise spec-  
ified, all components of the fluid cooler  
shall be fabricated of heavy-gauge,  
series 300 stainless steel. The fluid  
cooler shall be capable of withstanding  
water having a chloride content (NaCl)  
up to 750 mg/L; a sulfate content (SO4)  
up to 1200 mg/L; a calcium content  
(CaCO3) up to 800 mg/L; silica (SiO2)  
up to 150 mg/L; and design operat-  
ing ranges up to 10°C. The circulating  
water shall contain no oil, grease, fatty  
acids, or organic solvents.  
For process fluids that are not compatible with the standard galva-  
nized steel construction, stainless steel offers you the ultimate in cor-  
rosion resistance and long life.The thermal performance rating shall  
be based on the CoolingTechnology Institute certified performance  
rating adjusted for the thermal properties of stainless steel.  
4.1  
Replace paragraph 4.1 with the fol-  
lowing: Coil(s) shall consist of fully  
welded box headers with serpentine  
coils. All coil components shall be  
assembled from series 300 stainless  
steel. Coils shall be tested to 2757  
kPa air pressure while immersed in  
water. Maximum operating design pres-  
sure shall be 1551 kPa. The coil shall be  
designed for free drainages of fluid at  
shutdown.  
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Marley MC Fluid Cooler Specifications: Options  
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Specifications  
Specification Value  
Convenience and Safety Options  
Top Access Platform:  
Periodic inspection and maintenance of a fluid cooler distribution  
system is fundamental to preserving maximum cooling system effi-  
ciency. All fluid coolers—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.  
11.2 Add the following paragraph in  
the Access section: There shall be  
an access platform at the top of the  
fluid cooler to allow access to the drift  
eliminators and distribution system.  
The platform shall be free-standing  
galvanized steel bar grating, sup-  
ported by galvanized steel framework.  
The platform shall be surrounded by  
a handrail, kneerail, and toeboard  
designed according to meet local  
safety requirements. Handrails and  
kneerails shall consist of 42mm O.D. x  
15 gauge galvanized structural tubing,  
the handrail of which shall be capable  
of withstanding a 890 N concentrated  
live load in any direction. Posts are  
51mm x 51mm square structural tub-  
ing and shall be spaced on centers of  
2.44m or less. A ladder shall be per-  
manently attached to the platform and  
to the casing of the fluid cooler, rising  
from the base of the fluid cooler to the  
top of the handrail.  
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 loca-  
tion on the side of the fluid cooler 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.  
Ladder Extension:  
Many fluid coolers are installed such that the base of the unit is  
600mm 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 alle-  
viates this problem. Marley ladder extensions are available in stan-  
dard 1524mm and 3353mm lengths.  
11.2 Add the following to the end of  
paragraph 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 cutting the ladder to  
length; attaching it to the foot of the  
fluid cooler ladder; and anchoring it at  
its base.  
Ladder Safety Cage:  
11.3 Add the following paragraph in the  
Access section: A heavy gauge galva-  
nized steel safety cage shall surround  
the ladder, extending from a point  
approximately 2150mm above the foot  
of the ladder to the top of the handrail.  
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Marley MC Fluid Cooler Specifications: Options  
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Specifications  
Specification Value  
Where fluid coolers are installed on an elevated grillage or piers, it is  
often difficult to get to—and through—the access door conveniently.  
This platform provides easy, safe and comfortable access to that door.  
Access Door Platform:  
11.4 Add the following paragraph in the  
Access section: There shall be an  
access platform at the base of the fluid  
cooler extending across the width of  
the casing. The platform shall be gal-  
vanized steel bar grating, supported by  
galvanized steel framework attached to  
the fluid cooler. The platform shall be  
surrounded by a handrail, kneerail, and  
toeboard.  
This platform provides easy, safe and comfortable access to the  
access door facilitating inspection of the fill, distribution nozzles and  
the underside of the drift eliminators.  
Distribution System Access Door  
Platform:  
10.5 Add the following paragraph in the  
Access section: There shall be an  
access platform at the level of the  
distribution system access door. The  
platform shall be galvanized steel bar  
grating, supported by free-standinggal-  
vanized steel framework attached to  
the fluid cooler. The platform shall be  
surrounded by a handrail, kneerail, and  
toeboard.  
Control Options  
Control System:  
If it is your opinion that the control system for the fluid cooler be part  
of the fluid cooler manufacturers responsibility, we are in whole-  
hearted agreement with you. Who better to determine the most effi-  
cient mode and manner of a fluid coolers operation—and to apply a  
system most compatible with it—than the designer and manufacturer  
of the fluid cooler?  
6.4  
Add the following paragraph in the  
Mechanical Equipment section: The  
fluid cooler shall be equipped with a  
UL 508 control system in a IP14 or  
IP56 outdoor enclosure capable of  
controlling single-speed or two-speed  
motors as required, and designed  
specifically for fluid cooler applications.  
The panel shall include a main fused  
disconnect with an external operating  
handle, lockable in the off position for  
safety. Across-the-line magnetic start-  
ers as required shall be controlled with  
a solid state temperature controller.  
Door mounted selector switches shall  
be provided to enable automatic or  
manual control and wired for 120VAC  
control. Control circuit to be wired out  
to terminal blocks for field connection to  
remote vibration switches. The tempera-  
ture controller shall be adjustable for  
the required process temperature. The  
temperature controller will display two  
temperatures, one for process  
Marley variable speed drives are  
also available for the ultimate  
in temperature control, energy  
management and mechanical  
equipment longevity.  
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Marley MC Fluid Cooler Specifications: Options  
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Specifications  
Specification Value  
temperature at the coil and the other  
for set point. Process temperature input  
shall be obtained using a thermal sens-  
ing device on the process coil and wired  
back to the solid state temperature  
controller in the control panel. Staging  
of multiple motors and speeds will be  
accomplished with an integral PLC.  
Unless specified otherwise, a Fire  
Fighting Enterprises switch will be provid-  
ed. A double-pole, double-throw model  
is also available.The requirement for  
manual reset assures that the fluid cooler  
will be visited to determine the cause of  
excess vibration.  
Vibration Limit Switch:  
6.5  
Add the following paragraph in the  
Mechanical Equipment section: A  
single-pole, double-throw vibration  
limit switch in a IP55 housing shall be  
installed on the mechanical equipment  
support for wiring into the owners  
control panel. The purpose of this  
switch will be to interrupt power to the  
motor in the event of excessive vibra-  
tion. It shall be adjustable for sensitiv-  
ity, and shall require manual reset.  
The Marley basin heater components described at left represent our  
recommendation for a reliable automatic system for the prevention 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 customar-  
ily factory-mounted and tested.  
Basin Heater:  
11.2 Add the following paragraph in the  
Cold Water Basin section: Provide  
an electric immersion heater for each  
cell of the fluid cooler to prevent freez-  
ing of water in the collection basin  
during periods of shutdown. The rod  
type heater is installed in the side of  
the cold water basin. Each heater will  
include an integral thermostat, set  
point nominally 4°C but adjustable to  
suit local operating requirements.  
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.  
Fan Motor Variable Speed Drive:  
Marley VFD drive systems are designed to combine absolute tem-  
perature control 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 temperature. Precise temperature control  
is accomplished with far less stress to the mechanical equipment  
components.The improved energy management provides fast pay-  
back.  
Marley All Weather ACH550 System  
6.4  
Add the following paragraph in the  
Mechanical Equipment section when  
VFD is used with customers Building  
Management System: A complete UL  
listed Variable Speed Drive system in a  
IP10 indoor, IP52 indoor or IP14 outdoor  
enclosure shall be provided. The VFD  
shall use PWM technology with IGBT  
switching and integrated bypass design.  
VFD out put switching shall not cause  
mechanical issues with gearbox teeth  
or drive shafts. The VFD shall catch a fan  
spinning in the reverse direction without  
tripping. The panel shall include a main  
disconnect with short circuit protection  
and external operating handle, lockable  
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Marley MC Fluid Cooler Specifications: Options  
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24  
Specifications  
Specification Value  
in the off position for safety. The VFD  
system shall receive a speed reference  
signal from the Building Management  
System monitoring the tower fluid tem-  
perature. As an option to receiving the  
speed reference signal from a building  
management system, the drive must  
have the capability to receive a 4-20 ma  
temperature signal from an RTD trans-  
mitter. The VFD shall have an internal PI  
regulator to modulate fan speed main-  
taining set point temperature. The drive's  
panel display shall be able to display  
the set-point temperature and cold-fluid  
temperature on two separate lines. The  
bypass shall include a complete mag-  
netic bypass circuit and with 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 by-  
pass circuit the fan motor will run at con-  
stant full speed. The bypass circuit will  
not modulate ON and OFF based on fluid  
temperature. The application must be  
able to handle very cold fluid tempera-  
tures while the VFD is in a by-pass mode.  
Operator controls shall be mounted on  
the front of the enclosure and shall con-  
sist of start and stop control, bypass/VFD  
selection, Auto/Manual selections, manu-  
al speed control. To prevent heating prob-  
lems in the fluid cooloer fan motor and  
to assure proper gear reducer lubrication  
the VFD system shall de energize the  
motor once 25% motor speed is reached  
and cooling is no longer required. The  
fluid cooler manufacturer shall supply  
VFD start-up assistance. Tower vibration  
testing throughout the speed range is  
required to identify and lockout any natu-  
ral frequency vibration levels which may  
exceed CTI guidelines.  
Marley Premium VFD System  
6.4  
Add the following paragraph in the  
Mechanical Equipment section when  
VFD is used as a stand alone system:  
A complete UL listed Variable Speed  
Drive system in a IP52 indoor or IP14  
outdoor enclosure shall be provided. The  
VFD shall use PWM technology with  
IGBT switching and integrated bypass  
design. VFD output switching shall not  
cause mechanical issues with gearbox  
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Marley MC Fluid Cooler Specifications: Options  
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Specifications  
Specification Value  
teeth or drive shafts. The VFD shall catch  
a fan spinning in the reverse direction  
without tripping. The panel shall include  
a main disconnect with short circuit pro-  
tection and external operating handle,  
lockable in the off position for safety.  
The system shall include a solid state,  
PI temperature controller to adjust fre-  
quency output of the drive in response  
to the tower fluid temperature. The  
temperature of the fluid and set point  
shall be displayed on the door of the  
control panel. The bypass shall include a  
complete magnetic bypass circuit with  
capability to isolate the VFD when in  
the bypass mode. Transfer to the bypass  
mode shall be automatic in the event of  
VFD failure or for specific trip conditions  
allowing safe transfer of utility voltage  
to the motor. Automatic bypass with an  
earth ground condition is not allowed.  
The bypass contactor shall be cycled  
on and off while operating in bypass, to  
maintain the set-point temperature of  
the fluid. The drive design shall be oper-  
ated 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 selector switch internal to the  
panel allowing the fluid cooler fan motor  
to be run at full speed shall be furnished.  
To prevent heating problems in the fluid  
cooler fan motor and to assure proper  
gear box lubrication the VFD system  
shall de energize the motor once 25%  
motor speed is reached and cooling is  
no longer required. The VFD shall include  
de-icing logic with auto canceling and  
adjustable time. Speed in De-Ice mode  
shall not exceed 50% motor speed. The  
fluid cooler manufacturer shall supply  
VFD start-up assistance. Tower vibration  
testing throughout the speed range is  
required to identify and lockout any natu-  
ral frequency vibration levels which may  
exceed CTI guidelines.  
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Marley MC Fluid Cooler Specifications: Options  
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Specifications  
Specification Value  
Miscellaneous Options  
Sound Control  
Sound produced by a standard MC Fluid Cooler operating in an  
unobstructed environment will meet all but the most restrictive noise  
limitations—and will react favorably to natural attenuation. Where the  
fluid cooler has been sized to operate within an enclosure, the enclo-  
sure 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 noise at a critical point is likely to exceed an acceptable limit,  
you have several options—listed below in ascending order of cost  
impact:  
1.2  
Add the following paragraph  
under Base: The fluid cooler  
shall be quiet operation, and  
shall produce an overall level of  
sound not higher than _______  
dB(A) measured at the critical  
location indicated on the plans.  
• Where only a slight reduction in noise 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 than does from the air intake face.  
• In many cases, noise concerns are limited to night time, when ambi-  
ent noise levels are lower and neighbors are trying to sleep.You can  
usually resolve these situations by using two speed motors in either  
full/half speed or full/ 23 speed configuration, and operating the fans at  
reduced speed without cycling “after hours. (The natural night time  
reduction in wet-bulb temperature makes this a very feasible solution  
in most areas of the world, but the need to avoid cycling may cause  
the cold water temperature to vary significantly.)  
• Variable speed drives automatically minimize the fluid cooler's noise  
level during periods of reduced load and/or reduced ambient with-  
out sacrificing the system'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 noise is a concern at all times (for example, near a hospital),  
the best solution is to oversize the fluid cooler so it can operate con-  
tinuously at reduced (23 or ½) motor speed even at the highest design  
wet-bulb temperature.Typical sound reductions are 7 dB(A) at 23 fan  
speed or 10 dB(A) at ½ fan speed, but larger reductions are often pos-  
sible.  
The most extreme cases may require inlet and discharge sound  
attenuator sections—however, the static pressure loss imposed by  
discharge attenuators may necessitate an increase in fluid cooler size.  
Two stages of inlet or discharge attentuators supported by the fluid  
cooler and designed and tested for the most stringent requirements  
are available as an option. See page 13.  
The advantage is yours.You now have the choices you need to bal-  
ance your projects performance, space and cost requirements with  
your sound level needs for a win-win solution to your cooling system  
design.Your Marley sales representative will be able to help you meet  
your sound requirements.  
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Marley MC Fluid Cooler Specifications: Options  
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/
27  
Specifications  
Specification Value  
Where a fluid cooler is installed in a building well or there are high  
surrounding walls, it is possible that a proportion of the hot and  
humid discharge air will be drawn back into the fans thus increasing  
the inlet wet bulb temperature with detriment to the fluid cooler per-  
formance.  
Discharge Hood:  
6.4  
Add the following paragraph  
to the Mechanical Equipment  
Section: There shall be a galva-  
nized steel tapered duct on the  
discharge side of the fluid cooler.  
Drift eliminators shall be reposi-  
tioned into the lower section of  
the duct.  
The tapered discharge duct is intended to increase the exit velocity  
by up to 70% in order to reduce the effects of recirculation in some  
installations. Experience and sound judgement should be exercised to  
determine when and if a duct is required.  
If the surrounding walls are much higher than the fluid cooler dis-  
charge height, then extensions to the tapered duct may be installed.  
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GREGORY'S BANK  
WORCESTER WR3 8AB  
UNITED KINGDOM  
44 (0) 1905 720 200  
spxcooling.com  
In the interest of technological progress,  
all products are subject to design and/or  
material change without notice.  
©2008 SPX Cooling Technologies  
uk_MCF-TS-08A  
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