Marley MH Engineering Data

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MH Fluid Cooler

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Engineering Data & Specifications

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MULTICHILL Refrigeration Products
SPX Cooling Technologies - Marley Cooling Towers

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Cooke Industries - Phone: [phone] Fax: [phone] Email: [e-mail] Web: www.cookeindustries.co.nz

Marley

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MH Fluid Cooler

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Table of Contents

Engineering Data

Schematic – Single-Flow Models 6
Schematic – Double-Flow Models 7
Support 8
Freeze Prevention 9
Water Quality 10

Specifications / Base

Base 11
Thermal Performance 11
Performance Warranty 11
Coil 12
Design Loading 12
Construction 12
Mechanical Equipment 13
Fill, Louvers and Drift Eliminators 14
Distribution Basin 14
Casing, Fan Deck and Fan Guard 14
Access 15
Collection Basin 15

Specifications / Options

Stainless Steel Options

Stainless Steel Collection Basin 16
Stainless Steel Distribution Basin 16
All Stainless Steel Fluid Cooler 17
Stainless Steel Coil 17

Convenience and Safety Options

Handrail and Ladder 17
Distribution Basin Access Platform 18
Ladder Extension 18
Ladder Safety Cage 18
Access Door Platform 18
Plenum Walkway 19
Interior Mechanical Equipment Access Platform 19

Control Options

Control System 19
Vibration Limit Switch 20
Basin Heater 20
Variable Speed Drive 21

Miscellaneous Options

Dampers 21
Gear Drive 22
Motor Out of the Airstream 22
High Temperature Fill 22
Air Inlet Screens 22

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MH Fluid Cooler

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Marley's MH Fluid Cooler is the most efficient
system 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, they 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 11 thru 22 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 11 thru 15 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.

Pages 16 thru 22 provide paragraphs intended to
add those features, components, and materials
that will customize the fluid cooler to meet the
user‘s requirements.

5

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Engineering Data : Schematic

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Model

Dimensions Shipping Weight lb

Motor

hp

Pump

hp

L W H Weight

Heaviest

Section

MHF702 9'-1" 8'-5" 17'-1" 9,340 5,950 7.5 - 15 2

MHF703 12'-1" 8'-5" 17'-1" 11,200 7,250 10 - 20 3

MHF704 12'-1" 12'-0" 19'-7" 17,250 11,380 15 - 30 5

MHF705 18'-1" 12'-0" 19'-7" 25,975 17,070 22.5 - 45 7.5

Use this data for preliminary layouts only.
Obtain current drawing from your Marley sales
representative.

Marley's UPDATE web-based selection software
—available at www.marleyct.com—provides
MH Fluid Cooler model recommendations based
on customer's specific design requirements.

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MH Fluid Cooler

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Engineering Data : Schematic

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Model

Dimensions Shipping Weight lb

Motor

hp

Pump

hp

L W H Weight

Heaviest

Section

MHF706 11'-11" 23'-6" 22'-0" 35,890 24,110 20 - 75 2

@

7.5

MHF707 13'-11" 26'-0" 22'-0" 41,310 28,040 30 - 75 2

@

7.5

Use this data for preliminary layouts only.
Obtain current drawing from your Marley sales
representative.

Marley's UPDATE web-based selection software
—available at www.marleyct.com—provides
MH Fluid Cooler model recommendations based
on customer's specific design requirements.

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Engineering Data: Support

8

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Model D

Maximum
Deflection

MHF702 8'-3"

6QE"

MHF703 8'-3"

6"

MHF704 11'-10"

6"

MHF705 11'-10"

6"

MHF706 23'-10"

56O"

MHF707 25'-10"

56O"

Use this data for preliminary layouts only. Obtain
detailed support drawings from your Marley sales
representative.

Primary support consists of parallel I-beams running
the full length of the unit.

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Engineering Data: Freeze Prevention

9

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 to 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 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
45°F, the ambient temperature is below freezing and the
coils are not protected with industrial antifreeze.

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.

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 “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
marleyct.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

Marley offers 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
water temperature and level.

• Heat tracing for recirculating water pump.

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 and GPM
and on the 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.

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.

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Engineering Data: Water Quality

10

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 for 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 .

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.

Water Treatment

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
MH Fluid Cooler User Manual which accompanies the
fluid cooler and also is available from your local Marley
sales representative. For complete water treatment
recommendations and services contact Marley Water
Resources, toll free at 877 800 0929 or contact your local
Marley sales representative.

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Specifications: Base

Specifications Specification Value

11

1.0 Base:

1.1 Furnish and install an induced-draft,

crossflow-type, factory assembled,
galvanized steel, closed circuit fluid
cooler. Unit shall consist of _____
cell(s), as shown on plans. The limiting
overall dimensions of the tower shall
be _____ wide, _____ long, and _____
high to the top of the fan guard. Total
operating horsepower of all fans shall
not exceed _____ hp, consisting of
_____ @ _____ hp motor(s). Tower
shall be similar and equal in all
respects to Marley Model _______.

2.0 Thermal Performance:

2.1 Water as the heat transfer fluid.

The fluid cooler shall be capable of
cooling _____ GPM (L/s) of water
from _____ °F(°C) to _____ °F(°C) at a
design entering air wet-bulb tempera­ture of _____ °F(°C). Coil pressure drop
shall not exceed _____ psi(kPa). The
thermal performance rating shall be
Certified by the Cooling Technology
Institute.

2.1 Aqueous glycol solution as the heat
transfer fluid.

The fluid cooler shall be capable of
cooling _____ GPM (L/s) of water
from _____ °F(°C) to _____ °F(°C) at
a design entering air wet-bulb tem­perature of _____ °F(°C). Coil pressure
drop shall not exceed _____ psi(kPa).
The thermal performance rating shall
be based on the Cooling Technology
Institute certified performance rating
adjusted for the thermal properties of
the aqueous glycol solution used.

3.0 Performance Warranty:

3.1 CTI Certification notwithstanding, the

cooling tower manufacturer shall guar­antee that the fluid cooler supplied
will meet the specified performance
conditions when the tower is installed
according to plans. If, because of a
suspected thermal performance defi­ciency, the owner chooses to conduct
an on-site thermal performance test
under the supervision of a qualified,

Q 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 horsepower
avoid the introduction of unforeseen operational and site-related
influences. Specifying the number 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 coolers 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.

Q CTI Certification means that

the fluid cooler has been tested
under operating conditions and
found to perform as rated by the
manufacturer under those cir­cumstances. It assures the buyer
that the tower is not intentionally
or inadvertently undersized by
the manufacturer.

Q 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-specific 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 reluctance on the part of the
bidder should cause you some concern.

¬

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Specifications: Base

Specifications Specification Value

12

disinterested third party in accordance
with CTI or ASME standards during
the first year of operation; and if the
tower fails to perform within the limits
of test tolerance; then the fluid cooler
manufacturer 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 deficiency.

4.0 Coil:

4.1 Coil( s) shall consist of fully welded box

headers with serpentine coils and hot- dip
galvanized after fabrication. Coils shall
be tested to 400 psi(2757 kPa) air pres­sure while immersed in water. Maximum
operating design pressure shall be 225
psi(1551 kPa). The coil shall be designed
for free drainages of fluid at shutdown.

5.0 Design Loading:

5.1 The structure and anchorage shall be

designed to withstand a wind load of
20 psf (960 Pa) on single-flow models
and 30 psf (1440 Pa) on double-flow
models, as well as .4g seismic load
while operating. The fluid cooler shall
be designed to withstand shipping and
hoisting loads of 2g horizontal or 3g
vertical. The fan deck and hot water
basin covers on double-flow models
shall be designed for 50 psf(2.42 kPa)
live load or a 200 lb(91 kg) concen­trated load. Handrails, where specified,
shall be capable of withstanding a 200
lb(890N) concentrated live load in any
direction, and shall be designed in
accordance with OSHA guidelines.

6.0 Construction:

6.1 Except where otherwise specified, all

components of the fluid cooler shall
be fabricated of heavy-gauge steel,
protected against corrosion by G-235
galvanizing. 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

Q The MH Fluid Cooler coil

is suitable for cooling
water, oils, and other
fluids compatible with
carbon steel in a closed,
pressurized system. Each
coil is constructed of all­prime surface, continu­ous steel tubing, formed
into a serpentine shape
and welded into an
assembly. The complete
assembly is then hot­dip galvanized after fabrication. Design pressure is 225 psig, and
each coil is tested to 400 psig air pressure under water. Tubes are
sloped to provide free drainage when vented.

Q 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 cooling tower environment. Most MH Fluid
Cooler models will withstand 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.

Q 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 cooling tower water quality defined at
left. No paints or electrostatically-applied coatings, however
exotic they may be, can approach galvanization's history 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 12.

¬

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Specifications: Base

Specifications Specification Value

13

ppm as Cl-); a sulfate content (as SO4)
up to 250 ppm; a calcium content (as
CaCO3) up to 500 ppm; silica (as SiO2)
up to 150 ppm; and design operat­ing ranges up to 50°F (27.8°C). The
circulating water shall contain no oil,
grease, fatty acids, or organic solvents.

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 6.1. They are to be regarded
as minimum requirements. Where
component materials unique to indi­vidual tower 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.

7.0 Mechanical Equipment:

7.1 Fan(s) shall be heavy-duty, axial flow

design. Fan(s) shall be driven through
an industrial grade system of V-belts,
pulleys, and tapered roller bearings.
Bearings shall be rated at an L10 life of
40,000 hours, or greater.

7.2 Motor(s) shall be ____ hp maximum,
Totally Enclosed, 1.15 service factor,
variable torque, and specially insu­lated for cooling tower duty. Speed
and electrical characteristics shall be
______ RPM, single-winding, 3 phase,
60 hertz, ____ volts.

7.3 The fan and fan drive assembly for
each cell shall be supported by a rigid,
galvanized steel structural support that
resists misalignment. 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 tower shipment. This war­ranty is limited to the fan, fan shaft,
bearings, sheaves and mechanical
equipment support. The motor, motor
components, pumps and belt(s) are
warranted by their manufacturer.

Q Propeller-type fans require

only half the operating hp
of blower-type fans. The
Marley drive system fea­tures all-aluminum sheaves,
matched belts, and long-life
bearings 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
cooling tower fan. They are sometimes applied at horsepowers
significantly beyond their nameplate rating.

Unless otherwise specified, motor speed will be 1800 RPM, 60
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.

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Specifications: Base

Specifications Specification Value

14

8.0 Fill, Louvers and Drift Eliminators:

8.1 Fill shall be film-type, thermoformed of

15 mil (0.38 mm) thick PVC, with lou­vers and eliminators formed as part of
each fill sheet. Fill shall be suspended
from galvanized structural tubing sup­ported from the tower structure.

8.2 Coil louvers and eliminators shall be
film-type, thermoformed of 17 mil
(0.43mm) thick PVC and shall be easily
removable for access to tube bundle

8.3 Fill and coil drift eliminators shall be
triple-pass, and shall limit drift losses
to no more than 0.005% of the design
GPM flow rate of the recirculating
water. The air inlet face of the tower
shall be free of water splash-out.

9.0 Distribution Basins:

9.1 An open basin above the fill with

removable 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
shall be equipped with removable, gal­vanized steel covers.

9.2 A redistribution basin below the fill
with polypropylene nozzles installed in
the floor of the basin 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, Fan Deck and Fan Guard:

10.1 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" (8mm) and 7 gauge rods
and hot-dip galvanized after fabrication.

Q 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.

Q 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 office or representative.

Q Gravity-flow distribution basins are a feature of the MH Fluid

Cooler resulting in operating pump heads less than that encoun­tered in fluid coolers with pressurized spray systems. Also, these
basins are out where they can be easily inspected—even main­tained—while the fluid cooler is in operation. Spray systems are
extremely awkward to access and maintain.

Also, the plastic basin covers offered by some manufacturers are
incapable of supporting the loads imposed in maintenance. They
will, therefore, tell you that it is really unnecessary for you to
ever go to the top of their towers and—if you do have to—that it
is better for you to work from the top of a portable ladder!

Q 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—MHF706 and
MHF707—are designed to be used as a working platform.

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Specifications: Base

Specifications Specification Value

15

11.0 Access:

11.1 A large galvanized, hinged, steel

access door 24" (711mm) wide and
42" (1066mm) high shall be located
on both endwalls for entry into the
cold water basin and fan plenum area.
Access doors shall be operable from
inside as well as outside the tower.

12.0 Collection Basin:

12.1 The collection basin shall be heavy-

gauge galvanized steel. Suction
connections shall be equipped with
galvanized debris screens. A factory­installed, float-operated, mechani­cal makeup valve and waste water
blowdown line shall be included. A 4"
(101.7 mm) diameter PVC drain and
overflow shall be provided in each cell
of the tower. The basin shall include
a depressed section into which accu­mulated silt can be flushed to permit
cleaning. The basin floor adjacent to
the depressed section shall slope
toward the depressed section to pre­vent buildup of silt under the coil area.

12.2 Recirculation pump(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 connected directly to
the tower overflow.

13.0 Warranty:

13.1 The fluid cooler shall be free from

defects in materials and workmanship
for a period of eighteen (18) months
from the date of shipment.

Q 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 maintenance headache. Two
doors are standard on all MH Fluid Coolers—one in each endwall.

The removable-standpipe type of overflow is valuable because
it provides a way to achieve flush-out cleanability. Other drains
may be as little as 1" (25mm) diameter, making flush-out cleaning
impractical at best.

Location of the coil in the lower portion of the MH Fluid Cooler
makes it much easier to access for cleaning and inspection.

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Specifications Specification Value

16

Stainless Steel Options

Stainless Steel Collection Basin:

12.1: Replace paragraph 12.1 with the fol­lowing: The cold water basin shall be

heavy-guage series 300 welded stain­less steel. Suction connections shall
be equipped with stainless steel debris
screens. A factory-installed, float-oper­ated, mechanical makeup valve and
waste water blowdown line shall be
included. A 4" (101.7 mm) diameter
PVC drain and overflow shall be provid­ed in each cell of the tower. The basin
shall include a depressed section into
which accumulated silt can be flushed
to permit cleaning. The basin floor
adjacent to the depressed section shall
slope toward the depressed section to
prevent buildup of silt under the coil
area. All steel items which project into
the basin (coil supports, anchor clips,
etc) shall also be made of stainless
steel.

Stainless Steel Distribution Basin:

9.1 Replace paragraph 9.1 with the
following: An open stainless steel

basin above the fill with removable
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 shall be
equipped with removable, stainless
steel covers capable of withstanding
the loads described in paragraph 5.1.
All components of these basins with
the exception of the nozzles and redis­tribution piping shall be stainless steel.

9.2 Replace paragraph 9.2 with the fol­lowing: A redistribution basin below

the fill with removable interchange­able polypropylene nozzles installed
in the floor of the basin shall provide
full coverage of the coil at a flow rate
sufficient to ensure complete wetting
of the coil at all times. All components
of the basin with the exception of the
nozzles and ABS redistribution cover
shall be stainless steel.

Q 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 contaminants. 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 replacing
older towers—choose to specify stainless steel cold water basins.

Q 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.

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17

All Stainless Fluid Cooler

6.1 Replace paragraph 6.1 with the fol­lowing: Except where otherwise spec-

ified, all components of the fluid cooler
shall be fabricated of heavy-gauge,
series 300 stainless steel. The tower
shall be capable of withstanding water
having a chloride content (NaCl) up to
750 ppm; a sulfate content (SO4) up to
1200 ppm; a calcium content (CaCO3)
up to 800 ppm; silica (SiO2) up to 150
ppm; and design operating ranges up
to 50°F ( 27.8°C). The circulating water
shall contain no oil, grease, fatty acids,
or organic solvents.

Stainless Steel Coil:

4.1 Replace paragraph 4.1 with the fol­lowing: 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
400 psi(2757 kPa) air pressure while
immersed in water. Maximum oper­ating design pressure shall be 225
psi(1551 kPa). The coil shall be designed
for free drainages of fluid at shutdown.

Convenience and Safety Options

Handrail and Ladder: MHF706 and

MHF707 models only

11.2 Add the following paragraph in the
Access section: The top of the fluid

cooler shall be equipped with a sturdy
handrail, complete with kneerail and
toeboard, designed according to OSHA
guidelines. Handrails and kneerails
shall consist of 1.66" (42mm) O.D. x
15 gauge galvanized structural tubing,
the handrail of which shall be capable
of withstanding a 200 pound (890N)
concentrated live load in any direc­tion. Posts are 2" x 2" (51mm x 51mm)
square structural tubing and shall be
spaced on centers of 8'-0"
(2438mm) or less. A 1'-6" (457mm)
wide aluminum ladder with 3"(76mm)
I-beam side rails and 1.25" (32mm)
diameter rungs shall be permanently
attached to the endwall casing of the
fluid cooler, rising from the base of the
fluid cooler to the top of the handrail.

Q 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.

Q For process fluids that are not compatible with the standard gal-

vanized steel construction, stainless steel offers you the ultimate
in corrosion resistance and long life. The thermal performance
rating shall be based on the Cooling Technology Institute certified
performance rating adjusted for the thermal properties of stain­less steel.

Q 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 ladder and handrail on these models
Portable ladders and other “make-do” access means are inap­propriate for equipment of this size and complexity. Also, fixed
ladders without fan deck handrails invite unsafe maintenance
practices and must not be allowed.

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Specifications Specification Value

18

Distribution Basin Access Platform:

11.2 Add the following paragraph in the
Access section: Provide an external

platform near the top of the louver
face for access to the hot water dis­tribution system. The platform shall
be heavy gauge galvanized steel with
safety grip perforations, supported by
galvanized steel framework attached
to the fluid cooler. The platform shall
be surrounded by a handrail, kneerail,
and toeboard. A permanently attached
1'-6" (457.2 mm) wide aluminum lad­der with 3" (76.2 mm) I-beam side rails
and 1.25" (31.8 mm) diameter serrated
rungs shall extend from the base of
the tower to the top of the handrail.

Ladder Extension:

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: An aluminum safety

cage shall surround the ladder, extend­ing from a point approximately 7'-0"
(2.134m) above the foot of the ladder
to the top of the handrail surrounding
the fan deck or platform.

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 from the vertical lad­der to the endwall access door. The
platform shall be galvanized steel bar
grating, supported by galvanized steel
framework attached to the fluid cooler.
The platform shall be surrounded by a
handrail, kneerail, and toeboard.

Q Periodic inspection and maintenance of a fluid cooler distribution

system is fundamental to preserving maximum cooling system
efficiency. 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.

Access can be provided in a number of ways, including portable
ladders or scaffolding, but for maximum safety and convenience,
Marley offers a field installed access platform with guardrails 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.

Q Many fluid coolers are installed such that the base of the unit is

2v-0w (610 mm) 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's ladder extensions are
available in standard 5v-0w (1.524m) and 11v-0w (3.353m) lengths.

Q To meet OSHA guidelines, towers whose fan decks are 20'-0"

(6.096m) or more above roof or grade, and which are equipped
with ladders, should have safety cages surrounding the ladders,
but with approximately 7'-0" (2.134m) clear headroom.

Q 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. It also extends beyond the door to provide
ready access to the optional Control System.

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Specifications Specification Value

19

Plenum Walkway: MHF706 and
MHF707 models—standard on others.

11.5 Add the following paragraph in the
Access section: Provide a factory-

installed, heavy gauge galvanized steel
walkway with safety grip perforations,
extending from one endwall access
door to the other endwall access door.
This walkway shall be supported by a
galvanized steel framework, and the
top to the walkway shall be at or above
the cold water basin overflow level.

Interior Mechanical Equipment
Access Platform: MHF706 and

MHF707 models require plenum
walkway option.

11.6 Add the following 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 maintenance of the fluid cooler's
mechanical equipment. The platform
shall be surrounded by a sturdy hand­rail and kneerail system.

Control Options

Control System:

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 NEMA 3R
or 4X 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 start­ers 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 tem­perature controller shall be adjustable
for the required process temperature.

Q A galvanized steel walkway enables easy access to inspect col-

lection 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.

Q An elevated fiberglass bar grating service platform with alumi-

num ladder provides a permanent working surface to inspect and
maintain the mechanical equipment components.

Q 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.

¬

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Specifications Specification Value

20

The temperature controller will display
two temperatures, one for process
temperature at the coil and the other
for set point. Process temperature
input shall be obtained using a thermal
sensing 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.

Vibration Limit Switch:

6.5 Add the following paragraph in the
Mechanical Equipment section: A

single-pole, double-throw vibration limit
switch in a NEMA 4 housing shall be
installed on the mechanical equipment
support for wiring into the owner’s
control panel. The purpose of this
switch will be to interrupt power to the
motor in the event of excessive vibra­tion. It shall be adjustable for sensitiv­ity, and shall require manual reset.

Basin Heater:

11.2 Add the following paragraph in the
Cold Water Basin section: Provide a

system of electric immersion heaters
and controls for each cell of the tower
to prevent freezing of water in the
collection basin during periods of shut­down. The system shall consist of one
or more stainless 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
circuit board for temperature and low
water cut-off. A control probe shall be
located in the basin to monitor water
level and temperature. The system
shall be capable of maintaining 40°F
(4.4°C) water temperature at an ambi­ent air temperature of
_____ °F ( ____ °C).

Q Unless specified otherwise, a Metrix

switch will be provided. A double-pole,
double-throw model is also available.
If purchased in conjunction with the
Control System, it is also factory-wired.
The requirement for manual reset
assures that the tower will be visited to
determine the cause of excess vibration.

Q The basin heater components described at left represent Marley's

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 customarily factory-mounted and tested.

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.

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Specifications Specification Value

21

Variable Speed Drive:

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 NEMA 12
indoor or NEMA 3R outdoor enclo­sure capable of controlling motors as
required, and designed specifically for
fluid cooler applications. The panel
shall include a main circuit breaker
disconnect with an external operat­ing handle, lockable in the off position
for safety and 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 temperature controller
shall be adjustable for the required
process temperature. The temperature
controller will display two tempera­tures, one for process temperature and
the other for set point. . Water tem­perature input shall be obtained using a
thermal sensing device on the process
coil and wired back to the solid state
temperature controller in the VFD con­trol panel.

Miscellaneous Options

Positive Closure Dampers

4.2 Add the following paragraph in the
Coil section: Provide positive closure

actuating dampers to prevent air from
flowing through the coil section when
the dampers are closed. All linkage
and axles shall be stainless steel and
the blade bearings 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
customer's preference. Dampers shall
be field installed and actuators shall be
wired by others.

Q Marley VFD drive systems are

designed to combine absolute
temperature 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 payback.

Q Positive closure dampers give you the added security of safe

operation in freezing weather. Heat loss data from the coil can be
obtained through UPDATE, Marley's web-based selection soft­ware.

Pneumatic damper actuators are UL approved, totally enclosed
with spring return actuators. Electric actuators are industrial
grade, NEMA 4 rated, 2-position drive both ways. The damper
section protrudes from the louver face a minimum of 6".

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Specifications Specification Value

22

Gear Drive: MHF706 and MHF707
models only.

7.1 Replace paragraph 7.1 with the fol­lowing: Fan(s) shall be propeller-type,

incorporating aluminum alloy blades
and galvanized steel hubs. 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.

Motor Out of the Airstream: MHF706
and MHF077 models only with gear
drive option.

7.1 Add the following to the end of
paragraph 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:

8.1 Replace paragraph 8.1 with the
following: Fill shall be film-type,

thermoformed of 20 mil (0.51mm)
thick high-temperature PVC, with lou­vers and eliminators formed as part of
each fill sheet. Fill shall be suspended
from stainless steel structural tubing
supported from the tower structure.

Air Inlet Screens:

8.4 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 steel U-edging and shall be
removable.

Q The exclusive Marley System5

Geareducer

®

requires no oil changes for
five years, offering you unmatched reli­ability and low maintenance.

Q For many years, a feature of Marley-designed 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.

Q For process fluid above 135°F (57°C).

Q In wooded or windy areas, these screens help to keep leaves or

blowing debris out of the cooling tower and circulating water
system.

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Auckland (Head Office) Christchurch

31 Station Road, Penrose, Auckland, NZ Level 3, 161 Kilmore Street, Christchurch, NZ
PO Box 12021, Penrose, Auckland 1135 PO Box 17709, Sumner, Christchurch 8008
Ph: [phone] Fax: [phone] Ph: [phone] Fax: [phone]

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