MAINT COOLING TOWER OPEN TYPE.pdf

7/27/2019 MAINT COOLING TOWER OPEN TYPE.pdf

1/32

Bulletin 113-E Metric

EVAPCO Products are Manufactured Worldwide

EVAPCO, Inc. (World Headquarters) P.O. Box 1300, Westminster, Maryland 21158 USA

Phone (410) 756-2600 - Fax (410) 756-6450

EVAPCO Europe

Industriezone,

Tongeren-Oost 4010

3700 Tongeren, Belgium

Pone: (32) 12 395029

Fax: (32) 12 238527

E-mail: evapco.europe@ evapco.be

EVAPCO Europe S.r.l.

Via Ciro Menotti 10

I-20017 Passirana di Ro

Milan, Italy

Pone: (39) 02 9399041

Fax: (39) 02 93500840

Email: [email protected]

EVAPCO Europe GmbH

Bovert 22

D-40670 Meerbus, Germany

Pone: (49) 2159-6956-0

Fax: (49) 2159-6956-11

Email: [email protected]

OPERATION AND MAINTENANCE

INSTRUCTIONSFor EVAPCO Induced Draft and Forced Draft Cooling Towers

For EVAPCO Authorized Parts and Service,

Contact Your Local Mr. GoodTower Service Provider

or the EVAPCO Plant Nearest You

www.evapco.eu

AT UAT LSTA LRT


2/322

Table of Contents

Introduction ....................................................................................................................................3

Safety Precautions ...............................................................................................................................3

Checklists ....................................................................................................................................4

Initial and Seasonal Start-Up Cecklist ......................................................................................4

Maintenance Cecklist ...............................................................................................................5Seasonal Sut-Down Cecklist .................................................................................................. 7

Fan System ....................................................................................................................................7

Fan Motor Bearings ...................................................................................................................7

Fan Saft Bearings ....................................................................................................................7

Recommended Bearing Lubricants .............................................................................7

Fan Belt Adjustment ...................................................................................................................8

Fan and Motor Seave Alignment ..............................................................................................9

Fan System Capacity Control ..................................................................................................10

Fan Motor Cycling .....................................................................................................10

Two Speed Motors ....................................................................................................10

Variable Frequency Drives ........................................................................................10

Recirculated Water System Routine Maintenance .......................................................................... 11

Suction Strainer Assembly ....................................................................................................... 11

Cold Water Basin .....................................................................................................................12

Operating Water Levels ...........................................................................................................12

Water Make Up Valve ..............................................................................................................13

Pressurized Water Distribution System ....................................................................................13

Drift Eliminator Orientation ........................................................................................15

Water Treatment and Water Chemistry of the Recirculated Water System ................................. 16

Bleed or Blowdown ..................................................................................................................16

Control of Biological Contamination .........................................................................................16

Air Contamination ....................................................................................................................16

Water Cemistry Parameters ...................................................................................................16

Galvanized Steel - Passivation ................................................................................................17

Wite Rust ...............................................................................................................................18

Use of Soft Water .....................................................................................................................18

Stainless Steel ..................................................................................................................................18

Maintaining te Appearance of Stainless Steel ........................................................................19Cleaning Procedures for Stainless Steel .................................................................................19

Cold Weather Operation ....................................................................................................................20

Replacement Parts .............................................................................................................................23

Part Identication Drawings .....................................................................................................24

AT/UAT 2,4 and 2,6 m Wide Cells ..........................................................................24

AT/UAT 3; 3,6 and 4,2 m Wide Cells ...................................................................... 25

AT 1,2 m Wide Units .................................................................................................26

LRT All Models .......................................................................................................27

LSTA 1,2 and 1,6 m Wide Units .............................................................................28LSTA 2,4 and 3 m Wide Units ................................................................................29

AT/UAT wit Super Low Sound Fan 2,4 and 2,6 m Wide Cells .............................30

AT/UAT wit Super Low Sound Fan 3; 3,6 and 4,2 m Wide Cells .........................31


3/323

Introduction

Congratulations on te purcase of your EVAPCO evaporative cooling unit. EVAPCO equipment is

constructed of te igest quality materials and designed to provide years of reliable service wen

properly maintained.

Evaporative cooling equipment is often remotely located and periodic maintenance cecks are often

overlooked. It is important to establis a regular maintenance program and be sure tat te program isfollowed. Tis bulletin sould be used as a guide to establis a program. A clean and properly serviced

unit will provide a long service life and operate at peak efciency.

Tis bulletin includes recommended maintenance services for unit start up, unit operation and unit

sutdown and te frequency of eac. Please note: te recommendations of frequency of service are

minimums. Services sould be performed more often wen operating conditions necessitate.

Become familiar wit your evaporative cooling equipment. Refer to te isometric drawings located on

pages 24-31 for information on te arrangement of components in your equipment.

If you sould require any additional information about te operation or maintenance of tis equipment,contact your local EVAPCO representative. You may also visit www.evapco.eu for more information.

Safety Precautions

Qualied personnel sould use proper care, procedures and tools wen operating, maintaining or repairing

tis equipment in order to prevent personal injury and/or property damage. Te warnings listed below are

to be used as guidelines only.

WARNING: This equipment should never be operated without fan screens and access doorsproperly secured and in place.

WARNING: A lockable disconnect switch should be located within sight of the unit for each

fan motor associated with this equipment. Before performing any type of service

or inspection of the unit make certain that all power has been disconnected and

locked in the OFF position.

WARNING: The top horizontal surface of any unit is not intended to be used as a working

platform. No routine service work is required from this area.

WARNING: The recirculating water system may contain chemicals or biological contaminants

including Legionella Pneumophila, which could be harmful if inhaled or ingested.

Direct exposure to the discharge airstream or mists, generated while cleaning

components of the water system, require respiratory protection equipment

approved for such use by governmental occupational safety and health

authorities.

WARNING: During maintenance operations, the worker must use personal precautions

(gloves, helmet, masks, etc.) as prescribed by local authorities.

WARNING: For any exceptional, non routine work to be carried out on top of the unit, use

ladders, protection and adequate safety measures against the risk of a fall, in

accordance with safety requirements of the country in question.

WARNING: For assembling or disassembling the unit or unit sections, please follow therigging instructions or the instructions on the yellow labels on the individual unit

sections.


4/324

Initial and Seasonal Start-Up Checklist

General

1. Verify tat te overall installation reects te requirements of te installation guidelines

found in EVAPCO Bulletin 112 Equipment Layout Manual.

2. For multi-speed fan motors, verify tat 30 second or greater time delays are provided for

speed canges wen switcing from ig to low speed. Also ceck to see if interlocks are

provided to prevent simultaneously energizing ig and low speed.3. Verify all safety interlocks work properly.

4. For units operating wit a variable frequency drive, make certain tat minimum speed

requirements ave been set. Ceck wit VFD manufacturer for recommended minimum

speeds.

5. Verify tat te sensor used for fan sequencing and by-pass valve control is located

downstream of te point were te by-pass water mixes wit te condenser supply water,

if applicable.

6. Verify tat a water treatment plan as been implemented including passivation of

galvanized steel units. See Water Treatment section for more details.

BEFORE BEGINNING ANY MAINTENANCE, BE CERTAIN THAT THE POWER IS

TURNED OFF AND THE UNIT IS PROPERLY LOCKED AND TAGGED OUT!

Initial and Seasonal Start-Up

1. Clean and remove any debris, suc as leaves and dirt from te air inlets.

2. Flus te cold water basin (wit te strainer screens in place) to remove any sediment or

dirt.

3. Remove te strainer screen, clean and reinstall.

4. Ceck mecanical oat valve to see if it operates freely.

5. Inspect water distribution system nozzles and clean as required. Ceck for proper

orientation. (This is not required at initial start-up. The nozzles are clean and set at the

factory).

6. Ceck to ensure drift eliminators are securely in place.

7. Adjust fan belt tension as required.

8. Lubricate fan saft bearings prior to seasonal start-up. (This is not required at initial start-

up. The bearings have been lubricated at the factory prior to shipment).

9. Turn te fan(s) by and to insure it turns freely witout obstructions.

10. Visually inspect te fan blades. Blade clearance sould be approximately 12 mm from tip

of blade to te fan cowl. Te fan blades sould be securely tigtened to te fan ub.

11. If any stagnant water remains in te system including dead legs in te piping, te unit

must be disinfected prior to te fans being energized. Please refer to AShRAE Guideline12-2000 and CTI Guideline WTP-148 for more information.

12. Fill te cold water basin manually up to te overow connection.

After the unit has been energized, check the following:

1. Adjust mecanical oat valve as required.

2. Unit basin sould be lled to te proper operating level. See Recirculating Water System

Operating Levels section for more details.

3. Verify fan is rotating in proper direction.

4. Measure voltage and current on all tree power leads. Te current must not exceed te

motor nameplate full load amp rating.5. Adjust bleed valve to proper ow rate.


5/325

MAINTENANCE

CHECKLIST

PROCEDURE JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

1. Clean pan strainer monthly or as needed

2. Clean and ush pan** quarterly or as needed

3. Check bleed-off valve to make sure it is operative

monthly

4. Check operating level in pan and adjust oat

valve if necessary monthly

5. Check water distribution system and spray pattern

monthly

6. Check drift eliminators quarterly

7. Check the fan blades for cracks, missing

balancing weights, and vibrations - quarterly

8. Lubricate fan shaft bearings* - every 1000 hoursof operation or every three months

9. Lubricate fan motor bearings see mfgs

instructions. Typically for non-sealed bearings,

every 2-3 years

10. Check belt tension and adjust monthly

11. Sliding motor base Inspect and grease

annually or as needed

12. Check fan screens, inlet louvers and fans.

Remove any dirt or debris - monthly

13. Inspect and clean protective nish annually

-Galvanized: scrape and coat with ZRC

-Stainless: clean and polish with a stainlesssteel cleaner.

14. Check water quality for biological contamination.

Clean unit as needed and contact a water

treatment company for recommended water

treatment program** regularly

* See maintenance manual for start-up instructions and lubrication recommendations

** Cooling Towers must be cleaned on a regular basis to prevent the growth of bacteria including Legionella Pneumophila


6/326

MAINTENANCE

CHECKLIST

PROCEDURE JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC

1. Coupling/Shaft Inspect ex elements and

hardware for tightness, proper torque & crack/

deterioration monthly

2. Heater Controller Inspect controller and clean

probe ends quarterly

3. Heater Inspect junction box for loose wiring

and moisture one month after start-up and

semi-annually

4. Heater Inspect elements for scale build-up

quarterly

5. Electronic Water Level Controller Inspect

junction box for loose wiring and moisture semi-annually

6. Electronic Water Level Controller Clean probe

ends of scale build-up quarterly

7. Electronic Water Level Controller Clean inside

the standpipe annually

8. Solenoid Make-up Valve Inspect and clean

valve of debris as needed

9. Vibration Switch (mechanical) Inspect enclosure

for loose wiring and moisture one month after

start-up and monthly

10. Vibration Switch Adjust the sensitivity duringstart-up and annually

11. Sump Sweeper Piping Inspect and clean

piping of debris semi-annually

12. Water Level Indicator Inspect and clean

annually

DURING IDLE PERIODS:

1. One Month or longer: Rotate motor shaft/fan

10 turns bi-weekly

2. One Month or longer: Megger test motor

windings semi-annually


7/327

Seasonal Shut-Down Checklist

Wen te system is to be sut down for an extended period of time, te following services sould

be performed.

1. Te evaporative cooling unit sould be drained.

2. Te cold water basin sould be used and cleaned wit te suction strainer

screens in place.3. Te suction strainer screens sould be cleaned and re-installed.

4. Te cold water basin drain sould be left open.

5. Te fan saft bearings and motor base adjusting screws sould be lubricated.

6. Te water make up valve needs to be closed. All water make-up piping needs

to be drained, if not eat traced and insulated.

7. Te nis of te unit sould be inspected. Clean and renis as required.

8. Te fan bearings and motor bearings need to be turned at least once a mont

by and. Tis can be accomplised by making sure te units disconnect is

locked and tagged out, and grasping te fan assembly, rotating it several

turns.

Fan System

Te fan systems of bot centrifugal and axial driven units are rugged, owever, te fan system

must be cecked regularly and lubricated at te proper intervals. Te following maintenance

scedule is recommended.

Fan Motor BearingsEVAPCO evaporative cooling units use eiter a T.E.A.O. (Totally Enclosed Air Over) or a T.E.F.C.

(Totally Enclosed Fan Cooled) fan motor. Tese motors are built to Cooling Tower Dutyspecications. Tey are supplied wit permanently lubricated bearings and special moisture

protection on te bearings, saft and windings. After extended sut-downs, te motor sould be

cecked wit an insulation tester prior to restarting te motor.

Fan Shaft Ball BearingsLubricate te fan saft bearings every 1,000 ours of operation or every tree monts for induced

draft units. Lubricate te fan saft bearings every 2,000 ours of operation or every six monts for

forced draft units. Use any of te following syntetic waterproof, inibited greases wic are suitable

for operation between -40C and 120C. (For colder operating temperatures, contact te factory).

Mobil - ShC-32 Cevron - Multifak Premium 3

Total - Ceran WR2 or similar

Feed grease slowly into the bearings or the seals may be damaged. A hand grease gun

is recommended for this process. When introducing a new grease, all grease should be

purged from the bearings.

Most EVAPCO units are supplied wit extended grease lines to allow easy lubrication of te fan

saft bearings.


8/328

Unit Description Location of Lube Line Fittings

Induced Draft Units 2,4 m wide Located just beside te fan cas-

ing access door

Induced Draft Units 2,6 m wide Located just beside te fan cas-

ing access door

Induced Draft Units 3 m wide and 6 m wide Located inside te fan casing

access door

Induced Draft Units 3,6 m wide and 7,2 m wide Located inside te fan casing

access door

Induced Draft Units 4,2 m wide and 8,4 m wide Located inside te fan casing

access door

LSTA Forced Draft Units Located on te front of te unit

LRT Forced Draft Units Located on te front of te unit

Table 1 Location of Grease Lube Line Fittings for Belt Driven Units

Please note, the removal of the fan screens is not necessary on forced draft units

to access the extended lube line ttings.

Fan Shaft Sleeve Bearings (1,2 m wide LSTA units only)Lubricate te intermediate sleeve bearing(s) before unit start up. Te reservoir sould be cecked

several times during te rst week to ensure tat te oil reserve is brougt to full capacity. After

te rst week of operation, lubricate te bearing(s) every 1.000 ours of operation or every

tree monts (wicever occurs rst). hig temperatures or poor environmental conditions may

necessitate more frequent lubrication. Te oil reservoir consists of a large felt packed cavity witin

te bearing ousing. It is not necessary to maintain te oil level witin te ller cup.

Use one of te following industrial grade, non-detergent mineral oils. Do not use a detergent

based oil or those designated heavy duty or compounded. Different oils may be requiredwen operating at temperatures below -1C continuously. Table 2 provides a sort list of approved

lubricants for eac temperature range. Most automotive oils are detergent based and may not be

used. Detergent oils will remove te grapite in te bearing sleeve and cause bearing failure.

Ambient Temp Texaco Drydene Exxon

-1C to 38C Regal R&O 220 Paradene 220 Terrestic 220

-32C to -1C Capella WF 32 Refrig. Oil 3G ------------------

Table 2 - Sleeve Bearing Lubricants

Oil drippage may result from over-oiling or from using too ligt an oil. Sould tis condition persist

wit correct oiling, it is recommended tat te next eavier weigt oil be used.

All bearings used on EVAPCO equipment are factory adjusted and self aligning. Do not disturb

bearing alignment by tigtening te sleeve bearing caps.

Fan Belt AdjustmentTe fan belt tension sould be cecked at start up and again after te rst 24 ours of operation

to correct for any initial stretc. Te belt tension can be determined by applying a moderate

pressure midway te seaves. A properly tensioned belt will deect approximately 13 mm on

forced draft units and approximately 20 mm on induced draft units.


9/329

Figure 1 and Figure 2 sow two ways to measure tis deection. Belt tension sould be cecked

on a montly basis. A properly tensioned belt will not cirp or squeal wen te fan motor is

started.

Figure 1 Method 1 Figure 2 Method 2

On induced draft belt driven units provided wit externally mounted motors (2,4 and 2,6 m wide units),

Figure 3, and LSTA forced draft units, Figure 4, bot J-type adjustment bolts on te adjustable motor

base sould ave an equal amount of exposed tread for proper seave and belt alignment.

Figure 3 Externally Mounted Motors Figure 4 LSTA Externally Mounted Motor

Figure 5 Internally Mounted Motors Figure 6 LRT Motor Adjustment

On induced draft belt driven units wit internally mounted motors (3 m; 3,6 m; 4,2 m; 6 m; 7,2 m and

8,4 m wide units), Figure 5, and LRT units, Figure 6, a motor adjustment tool is provided. Te tool

will be found on te adjustment nut. To use, place te ex end over te adjustment nut. Tension te

belt by turning te nut counterclockwise. Wen te belts are properly tensioned, tigten te lock nut.

Direct drive fan units do not require any adjustment.

BELT

DRIVERShEAVE

DRIVENShEAVE

STRAIGhT EDGE

13 mm or 20 mm DEFLECTION =PROPER BELT TENSION

BELT

DRIVER

ShEAVE

DRIVENShEAVE

TAPE MEASURE

13 mm or 20 mm DEFLECTION =PROPER BELT TENSION

ADJUSTMENTNUTS

ADJUSTMENTNUTS

ADJUSTMENT NUT

ADJUSTMENT TOOL

SWING OUTMOTOR BASE

SLIDINGMOTOR BASE

ADJUSTMENT NUT


10/3210

Fan System Capacity Control

Tere are several metods for capacity control of te evaporative cooling unit. Metods include:

Fan motor cycling, te use of two speed motors and te use of variable frequency drives (VFDs).

Fan Motor CyclingFan Motor Cycling requires te use of a single stage termostat wic senses te water

temperature. Te contacts of te termostat are wired in series wit te fan motors starterolding coil.

Fan Motor Cycling is often found to be inadequate were te load as a wide uctuation. In tis

metod, tere are only two stable levels of performance: 100% of capacity wen te fan is on and

approximately 10% of capacity wen te fan is off. Please note, rapid cycling of te fan motors

can cause te fan motor to overeat. Controls should be set to only allow a maximum of six

(6) start/stop cycles per hour.

IMPORTANT

ThE RECIRCULATION PUMP ShOULD NOT BE USED AS A MEANS OF CAPACITY CONTROLAND ShOULD NOT BE CYCLED FREQUENTLY. EXCESSIVE CYCLING CAN LEAD TO

SCALE BUILD-UP AND REDUCES ThE PERFORMANCE. FREQUENT CYCLING OF ThE

SPRAY PUMP, WIThOUT ThE FANS IN OPERATION, WILL PROVOKE DRIFT AND SPRAY

WATER MIGRATION OVER ThE AIR INLET LOUVERS, WhICh IS PROhIBITED IN MOST

COUNTRIES. PLEASE CONSULT YOUR LOCAL LEGISLATION.

Two Speed MotorsTe use of a two speed motor provides an additional step of capacity control wen used wit te

fan cycling metod. Te low speed of te motor will provide 60% of full speed capacity.

Two speed capacity control systems require not only a two speed motor, but a two stage

termostat and te proper two speed motor starter. Te most common two speed motor is a

single winding type. Tis is also known as a consequent pole design. Two speed two winding

motors are also available. All multi-speed motors used in evaporative cooling units sould be

variable torque design.

It is important to note tat wen two speed motors are to be used, te motor starter controls must

be equipped wit a decelerating time delay relay. Te time delay sould be a minimum of a 30

second delay wen switcing from ig speed to low speed.

Sequence of Operation for Two Fan Units with Two Speed Motors During Peak Load1. Bot fan motors on full speed full water ow over bot cells

2. One fan motor on ig speed, one fan motor on low speed full water ow over bot

cells

3. Bot fan motors on low speed full ow over bot cells

4. One fan motor on low speed, one fan motor off full water ow over bot cells

5. Bot fan motors off full water ow over bot cells

6. Bot fan motors off full single cell ow troug one cell

Variable Frequency Drives

Te use of a variable frequency drive (VFD) provides te most precise metod of capacitycontrol. A VFD is a device tat converts a xed AC voltage and frequency and canges it into an

AC adjustable voltage and frequency used to control te speed of an AC motor. By adjusting te

voltage and frequency, te AC induction motor can operate at many different speeds.


11/3211

Te use of VFD tecnology can also benet te life of te mecanical components wit fewer and

smooter motor starts and built in motor diagnostics. VFD tecnology as particular benet on

evaporative cooling units operating in cold climates were airow can be modulated to minimize

icing and reversed at low speed for de-icing cycles. Applications using a VFD for capacity control

must also use an inverter duty motor built in compliance wit IEC. Tis is an available option from

EVAPCO. Te standard fan motors supplied by EVAPCO are not intended for use wit VFDs.

Te type of motor, manufacturer of te VFD, motor lead lengts (between te motor and te

VFD), conduit runs and grounding can dramatically affect te response and life of te motor.

Te motor lead lengt restrictions vary wit te motor vendor. Regardless of motor supplier,

minimizing motor lead lengt between te motor and te drive is good practice.

Sequence of Operation for Multi-fan Units with a VFD During Peak Load

1. Te VFDs sould all be syncronized to speed up and slow down

uniformly.

2. Te VFDs need to ave a pre-set sutoff to prevent water temperatures

from becoming too cold and to prevent te drive from trying to turn te

fan at near zero speed.

3. Operating below 25% of motor speed acieves very little return in fanenergy savings and capacity control. Ceck wit your VFD supplier if

operating below 25% is possible.

For more details on te use of variable frequency drives, please request a copy of EVAPCOs

Engineering Bulletin 39.

Recirculated Water System Routine Maintenance

Suction Strainer in Cold Water BasinTe pan strainer sould be removed and cleaned montly or as often as necessary. Te suction

strainer is te rst line of defense in keeping debris out of te system. Make certain tat te

strainer is properly located over te pump suction, alongside te anti-vortexing ood.

STRAINERASSEMBLY

STRAINERhANDLE

ANTI-VORTEXINGhOOD

ANTI-VORTEXINGhOOD

STRAINERASSEMBLY

STRAINERhANDLE

Figure 7 Single Strainer Assembly Figure 8 Dual Strainer Assembly


12/3212

Cold Water BasinTe cold water basin sould be used out quarterly, and cecked montly or more often if

necessary, to remove any accumulation of dirt or sediment wic normally collects in te basin.

Sediment can become corrosive and cause deterioration of basin materials. Wen using te

basin, it is important to keep te suction strainers in place to prevent any sediment from entering

te system. After te basin as been cleaned, te strainers sould be removed and cleaned

before relling te basin wit fres water.

Operating Level of Water in Cold Water BasinTe operating level sould be cecked montly to make sure te water level is correct. Refer to

Table 3 for unit specic levels.

Model Number Operating

Level

AT 14-64 troug 14-912 180 mm

AT 18-49 troug 38-942 230 mmAT 19-56 troug 19-98 230 mm

AT 110-112 troug 310-954 230 mm

AT 112-012 troug 312-960 230 mm

AT 114-0124 troug 314-1272 280 mm

AT 26-517 troug 28-917 230 mm

AT 212-59 troug 212-99 230 mm

AT 215-29 troug 215-99 230 mm

AT 216-49 troug 216-914 230 mm

AT 220-112 troug 220-918 230 mm

AT 224-018 troug 224-920 230 mm

AT 228-0124 troug 428-1248 280 mmAT 420-124 troug 424-936 280 mm

LSTA

LSTA

LSTA

LSTA

4-61

5-121

8P-121

10-121

troug

troug

troug

troug

4-126

5-187

8P-365

10-366

230 mm

230 mm

230 mm

330 mm

LRT 3-61 troug 8-128 200 mm

Table 3 Recommended Operating Water Level

At initial start up or after te unit as been drained, te unit must be lled to te overow level.Overow is above te normal operating level and accommodates te volume of water normally in

suspension in te water distribution system and some of te piping external to te unit.

Te water level sould always be above te strainer. Ceck by running te pump wit te fan

motors off and observing te water level troug te access door or remove te air inlet louver.


13/3213

Water Make Up ValveA mecanical oat valve assembly is provided as standard equipment on te evaporative cooling

unit (unless te unit as been ordered wit an optional electronic water level control package

or te unit is arranged for remote sump operation). Te make up valve is easily accessible from

outside te unit troug te access door or removable air inlet louver. Te make up valve is a

bronze valve connected to a oat arm assembly and is activated by a large foam lled plastic

oat. Te oat is mounted on an all tread rod eld in place by wing nuts. Te water level in te

basin is adjusted by repositioning te oat and all tread using te wing nuts. Refer to Figure 9for details.

Figure 9 Mechanical Water Make Up Valve

Te make up valve assembly sould be inspected montly and adjusted as required. Te valve

sould be inspected annually for leakage and if necessary, te valve seat sould be replaced.

Te make up water pressure sould be maintained between 140 and 340 kPa.

Pressurized Water Distribution SystemsAll EVAPCO cooling towers are supplied wit wide orice water diffusers. Te water distribution

system sould be cecked montly to make sure it is operating properly. Always ceck te spray

system wit te pump on and te fans off (locked and tagged out).

On forced draft units (LRT and LSTA models), remove one or two eliminator sections from te top

of te unit and observe te operation of te water distribution system.

On induced draft units (AT and UAT models), lifting andles are provided on several sections ofeliminators witin reac of te access door. Eliminators can be easily removed from outside of

te unit to observe te water distribution system. Te diffusers are essentially non-clogging and

sould seldom need cleaning or maintenance.

FLOAT BALLMAKE-UP VALVE

FLOAT ARM

ADJUSTMENTWINGNUTS


14/3214

If te water diffusers are not functioning properly, it is a sign tat te suction strainer as not been

working properly and tat foreign matter or dirt as accumulated in te water distribution pipes.

Te nozzles can be cleared by taking a small pointed probe and moving it back and fort in te

diffuser opening, wit te pump(s) running and te cooling load and fan(s) off.

If an extreme build up of dirt or foreign matter occurs, remove te end cap in eac branc to us

te debris from te eader pipe. Te spray brances and eader can be removed for cleaning,

but sould only be done if absolutely necessary.

After te water distribution system as been cleaned, te suction strainer sould be cecked

to make sure it is in good operating condition and positioned properly so tat cavitation or air

entrapment does not occur.

Wen inspecting and cleaning te water distribution system, always ceck tat te orientation

of te water diffusers is correct as sown below for LRT and LSTA models in Figure 10 and as

sown in Figure 11 for AT and UAT models. Te top of te EVAPCO logo on te nozzle is parallel

wit te top of te water distribution pipe.

THREADED END CAP

Figure 10 - Water Distribution

Figure 11 - Water Distribution


15/3215

Drift Eliminators

Induced Draft Units (AT and UAT)Orientation of te eliminator sections on induced draft units is not critical. Note toug, tat te

eliminator sections must t tigtly togeter witin te fan section of te unit.

Forced Draft Units (LRT and LSTA Models)Proper orientation of te eliminator sections on forced draft units is sown in Figures 12 troug

15 below. Drift eliminators must be correctly replaced wenever tey are removed for service.Improperly oriented drift eliminators may lead to recirculation.

Te eliminator sections are constructed of PVC and are not designed to support te weigt of a

person or to be used as a work surface for any equipment or tools. Use of tese eliminators as a

walking surface or working platform may result in injury to personnel or damage to te equipment.

Figure 12 - Drift Eliminators Figure 13 - Drift Eliminator Orientation

on LRT units

Figure 14 - Drift Eliminator Orientation Figure 15 - Drift Eliminator Orientation

on 1,2 and 1,6 m wide LSTA units on 2,4 and 3 m wide LSTA units.


16/3216

Water Treatment and Water Chemistry of the Recirculated Water System

Proper water treatment is an essential part of te maintenance required for evaporative coolingequipment. A well designed and consistently implemented water treatment program will elp toensure efcient system operation wile maximizing te equipments service life. A qualied watertreatment company sould design a site specic water treatment protocol based on equipment(including all metallurgies in te cooling system), location, makeup water quality, and usage.

Bleed or BlowdownDuring te evaporative process, water salts remain inside te cooling tower togeter wit allimpurities accumulated during te regular operation. Tese substances, wic continue torecirculate in te system, must be controlled to avoid excessive concentration wic can lead tocorrosion, scale, or biological fouling.

Evaporative cooling equipment requires a bleed or blowdown line, located on te discarge sideof te recirculating pump, to remove concentrated (cycled up) water from te system. Evapcorecommends an automated conductivity controller to maximize te water efciency of yoursystem. Based on recommendations from your water treatment company, te conductivity

controller sould open and close a motorized ball or solenoid valve to maintain te conductivityof te recirculating water. If a manual valve is used to control te rate of bleed it sould be set tomaintain te conductivity of te recirculating water during periods of peak load at te maximum levelrecommended by your water treatment company. Te bleed line and valve sould be large enougto allow bleed off of an amount of water equal to1,6 (l/r) x capacity (kW).

Control of Biological ContaminationEvaporative cooling equipment sould be inspected regularly to ensure good microbiologicalcontrol. Inspections sould include bot monitoring of microbial populations via culturingtecniques and visual inspections for evidence of biofouling.

Poor microbiological control can result in loss of eat transfer efciency, increase corrosionpotential, and increase te risk of patogens suc as tose tat cause Legionnaires disease.Your site specic water treatment protocol sould include procedures for routine operation,startup after a sut-down period, and system lay-up, if applicable. If excessive microbiologicalcontamination is detected, a more aggressive mecanical cleaning and/or water treatmentprogram sould be undertaken. It is important tat all internal surfaces, particularly te basin, bekept clean of accumulated dirt and sludge. Additionally, drift eliminators sould be inspected andmaintained in good operating condition.

Air Contamination

Evaporative cooling equipment draws in air as part of normal operation and can scrub particulateout of te air. Do not locate your unit next to smokestacks, discarge ducts, vents, ue gasexausts, etc. because te unit will draw in tese fumes wic may lead to accelerated corrosionor deposition potential witin te unit. Additionally, it is important to locate your unit away fromte buildings fres air intakes to prevent any drift, biological activity, or oter unit discarge fromentering te buildings air system.

Water Chemistry ParametersTe water treatment program designed for your evaporative cooling equipment must becompatible wit te units materials of construction. Control of corrosion and scale will be verydifcult if te recirculating water cemistry is not consistently maintained witin te ranges notedin Table 4 or witin te limits provided by your local water treatment specialist.


17/3217

TABLE 4 Recommended Water Chemistry Guidelines

Property Z-725

Galvanized Steel

Type 304

Stainless Steel

Type 316

Stainless Steel

ph 7.0 8.8 6.0 9.5 6.0 9.5

ph During Passivation 7.0 8.0 N/A N/A

Total Suspended Solids (ppm)*


18/3218

Canges in water cemistry control may be considered after te passivation process is completeas evidenced by te galvanized surfaces taking on a dull gray color. Any canges to tetreatment program or control limits sould be made slowly, in stages wile documenting teimpact of te canges on te passivated zinc surfaces.

Operating galvanized evaporative cooling equipment wit a water ph below 6.0for any period may cause removal of te protective zinc coating.

Operating galvanized evaporative cooling equipment wit a water ph above 9.0for any period may destabilize te passivated surface and create wite rust.

Repassivation may be required at any time in te service life of te equipment ifan upset condition occurs wic destabilizes te passivated zinc surface.

White RustWite rust is dened as te rapid formation of non-protective zinc carbonate cells on te surface ofgalvanized steel. Tese deposits appear as wite powdery cells and are considered to be a zinccorrosion by-product. Tese cells are porous and allow continued corrosion of any non-passivatedgalvanized steel surface. Tis type of corrosion is most prevalent in te wetted areas of evaporativecooling products. It sould be noted tat not all wite deposits found on galvanized steel surfacesare due to wite rust. As a result, it is imperative to determine te inorganic content of te deposit.Te deposits may be calcium based and not zinc based.

Soft WaterTe use of soft water wit a galvanized steel unit is not recommended. Soft water is corrosive togalvanized steel.

In general, bot Type 304 and Type 316 stainless steel exibit good corrosion resistance to softwater. however, soft water is usually generated from water softeners wic typically use a brinesolution (concentrated salt water) to regenerate. After regeneration, tis brine is used. If tesoftener is out of adjustment, not all te brine will us out and tis salt (NaCl) will be carried outwit te nised water. Tis poses te risk of ig clorides in te units recirculated water. Type304 stainless steel is susceptible to corrosion at ig cloride levels. Type 316 stainless steel ismore resistant to tis corrosion.

Stainless Steel

Stainless steel is te most cost effective material of construction available to extend te life of an

evaporative cooling unit.

Te stainless steel seet material utilized by EVAPCO is Type 304 and Type 316 wit a No. 2B

unpolised nis. Type 304 stainless steel is a basic cromium-nickel austenitic stainless steel

and is suitable for a wide range of applications. It is readily available trougout te world andis easy to form during te fabrication process. Type 316 stainless steel offers more corrosion

resistance tan Type 304 due to te addition of molybdenum and a iger nickel content, wic

provides greater resistance to pitting and crevice corrosion in te presence of clorides. As a

result, Type 316 stainless steel is desirable in eavy industrial, marine environments and were

make up water quality requires it.

Stainless steel provides its superior corrosion resistance by developing a surface lm of

cromium oxide during te manufacturing process. In order to ensure maximum corrosion

protection, stainless steel must be kept clean and ave an adequate supply of oxygen to combine

wit te cromium in te stainless steel to form cromium-oxide, a protective passivation layer.Te protective layer of cromium-oxide develops during routine exposure to te oxygen content

in te atmospere. Tis occurs during te milling process and continuously as te stainless is

formed and saped for its nal use.


19/3219

Maintaining the Appearance of Stainless SteelIt is a common misconception tat stainless steel is stain and rust proof, making surface maintenance

not required at all. Tis is simply not true. Like mill galvanized steel, stainless steel is most effective

wen kept clean. Tis is especially true wen located in atmosperes wit cloride salts, suldes or

oter rusting metals. In tese environments, stainless steel can discolor, rust or corrode.

Once te unit arrives at te job site, te most effective way of maintaining te stainless steel nis

is to keep it clean! At a minimum, te unit sould be wased down annually to reduce residual dirt

or surface deposits on te stainless steel. In addition, tis was down will keep te stainless steelcomponents free from te corrosive elements in te atmospere including clorides and suldes

wic are damaging to stainless steel.

Cleaning of Stainless SteelRoutine Maintenance Mild Cleaning

Simple pressure wasing (of seet metal components only), using ouseold cleaners,

detergents or ammonia annually (more frequently in marine or industrial environments) will

elp maintain te nis and keep it free of atmosperic contaminants.

Minor Surface Dirt Mildly Aggressive Cleaning

Use of a sponge or bristle brus wit a non-abrasive cleaner is recommended. After

cleaning, rinse wit warm water from a ose or pressure waser. Towel dry cleaned area

and coat area wit a ig quality wax to provide extra protection.

More Aggressive Cleaning Removal of Fingerprints or Grease

Repeat processes 1 and 2, ten use a ydro-carbon solvent like Acetone or alcool. As

wit any ydro-carbon solvent, caution must be taken wen using te product. Do not use

in conned spaces or wile smoking. Keep solvents out of contact wit ands and skin.

houseold glass cleaner, Spic n Span are oter options for cleaners. After cleaning, towel

dry and apply a coat of ig quality wax for extra protection.

Aggressive Cleaning Removing Stains or Light Rust

If iron contamination or surface staining is suspected, immediately remove te stain or rust using

a crome, brass or silver cleaner. Te use of mild non-scratcing creams and polises are also

recommended. Wen te cleaning procedure is complete; use a ig quality wax for extra protection.

Most Aggressive Cleaning Removing Heavy Rust Deposits, Iron Contamination,

Spot Weld Discoloration and Weld Spatter using Acid

First try processes 1 troug 4. If te stain or rust is not removed, te following sould be

used as a last resort. Rinse te surface wit ot water. Use a saturated solution of oxalic

or posporic acid (10 to 15% acid solution). Tis sould be applied wit a soft clot andallowed to stand for a few minutes do not rub. Tis acid sould etc out te iron particles.

Follow tis wit an ammonia and water rinse. Rinse te surface again wit ot water; coat

wit a ig quality wax for added protection. Use extreme caution wen working wit acids!

Syntetic rubber gloves sould be used, goggles and aprons are advisable.

DO NOT USE THIS METHOD IF THE UNIT HAS GALVANIZED STEEL COMPONENTS.

As a minimum, tese guidelines sould be followed to maintain and clean te stainless steel unit.

Wen cleaning stainless steel, NEVER use coarse abrasives or steel wool, NEVER clean wit

mineral acids and NEVER leave stainless in contact wit iron or carbon steel.

For more information on cleaning stainless steel, please request a copy of EVAPCOS Engineering

Bulletin 40.


20/3220

Cold Weather Operation

EVAPCO counterow evaporative cooling equipment is well suited to operate in cold weater

conditions. Te counterow cooling tower design encases te eat transfer media (ll) completely

and protects it from te outside elements suc as wind wic can cause freezing in te unit.

Wen te evaporative cooling unit is going to be used during cold weater conditions, several items need

to be considered. Tese include: unit layout; unit piping; unit accessories and capacity control of te units.

Unit LayoutAdequate unobstructed air ow must be provided for bot te intake and discarge from te unit.

It is imperative tat te equipment minimize te risk of recirculation. Recirculation can result in

condensation freezing te inlet louvers, fans and fan screens. Te buildup of ice on tese areas

can adversely affect air ow and in more severe cases, lead to failure of tese components.

Prevailing winds can create icing conditions on te inlet louvers and fan screens adversely

affecting airow to te unit.

For additional information on unit layout, please refer to EVAPCOs Equipment Layout Manual -

Bulletin 112.

Unit PipingAll external piping (water make up lines, equalizers, riser piping) tat is not drained needs to be eat

traced and insulated to make certain it does not freeze. All piping sould be tted wit drain valves

to avoid dead legs wic can lead to Legionella contamination. System piping accessories (make

up valves, control valves, water circulation pumps and water level control packages) also require

eat tracing and insulation. If any of tese items are not properly eat traced and insulated, te

ensuing ice formation may result in component failure and cause a sutdown of te cooling unit.

Te use of a bypass sould also be considered. Typically, winter loads are less tan peak

summer loads. Wen tis is te case, a cooling tower bypass needs to be incorporated intote system design to allow water to bypass te towers water distribution system as a means

of capacity control. EVAPCO recommends tat te cooling tower bypass be installed in te

condenser water piping system. Bypasses installed in tis manner require a section of piping

between te condenser water supply and return leading to and from te cooling tower. Never

use a partial bypass during cold weather operation. Reduced water ow can result in uneven

water ow over te eat transfer media (ll), wic can cause ice formation.

Please note: bypasses sould be periodically used to minimize stagnant water conditions,

unless te bypass is piped directly into te units cold water basin.

Unit AccessoriesTe appropriate accessories to prevent or minimize ice formation during cold weater operation

are relatively simple and inexpensive. Tese accessories include cold water basin eaters, te use

of a remote sump, electric water level control and vibration cut out switces. Eac of tese optional

accessories ensure tat te cooling tower will function properly during cold weater operation.

Cold Water Basin Heaters

Optional basin eaters can be furnised wit te cooling tower to prevent te water from

freezing in te basin wen te unit is idle during low ambient conditions. Te basin eaters

are designed to maintain 5 C basin water temperature at -18 C, -29 C and -40 C ambient

temperature. Te eaters are only energized wen te condenser water pumps are off and

no water is owing over te tower. As long as tere is a eat load and water is owing over

te tower.


21/3221

Remote Sumps

A remote sump located in an indoor eated space is an excellent way to prevent freezing

in te cold water basin during idle or no load conditions because te basin and associated

piping will drain by gravity wenever te circulating pump is idle. EVAPCO can provide

connections in te cold water basin to accommodate for remote sump installations.

Electric Water Level Control

Optional electric water level control packages can be furnised to replace te standard

mecanical oat and valve assembly. Te electric water level control eliminates te freezing

problems experienced by te mecanical oat. In addition, it provides accurate control of te

basin water level and does not require eld adjustment even under varying load conditions.

Please note: te standpipe assembly, make up piping and solenoid valve must be eat

traced and insulated to prevent tem from freezing.

Vibration Cut Out Switches

During severe cold weater conditions, ice can form on te fans of cooling towers causing

excessive vibration. Te optional vibration switc suts te fan off avoiding potential

damage to or failure of te drive system.

Capacity Control Methods for Cold Weather OperationInduced draft and forced draft cooling towers require separate guidelines for capacity control during cold

weater operation.

Te sequence of control for a cooling tower operating at low ambient conditions is muc te same as

a cooling tower operating under summer conditions provided tat te ambient temperature is above

freezing. Wen te ambient temperatures are below freezing, additional precautions must be taken to

avoid te potential for damaging ice formation.

It is very important to maintain close control of te cooling tower during winter operation. EVAPCOrecommends tat an absolute MINIMUM leaving water temperature of 6 C must be maintained;

obviously, te iger te water temperature from te tower, te lower te potential for ice formation. Tis

assumes tat proper water ow over te tower is maintained.

Induced Draft Unit Capacity Control

Te simplest metod of capacity control is cycling te fan motor on and off in response to

te leaving water temperature of te tower. however, tis metod of control results in larger

temperature differentials and longer periods of down time. During extremely low ambient

conditions, te moist air may condense and freeze on te fan drive system. Therefore, fans

must be cycled during extremely low ambient conditions to avoid long periods of idle time

whether water is owing over the ll or in bypass. The number of start/stop cycles must be

limited to no more than six per hour.

A better metod of control is te use of two speed fan motors. Tis allows an additional step of

capacity control. Tis additional step reduces te water temperature differential, and terefore, te

amount of time te fans are off. In addition, two speed motors provide savings in energy costs,

since te tower as te potential to operate on low speed for te reduced load requirements.

Te best metod of capacity control during cold weater operation is te use of a variable

frequency drive (VFD). Tis allows te closest control of te leaving water temperature by allowing

te fan(s) to run at te appropriate speed to closely matc te building load. As te building loaddecreases, te VFD control system may operate for long periods of time at fan speeds below 50

percent. Operating a low leaving water temperature and low air velocity troug te unit can cause

ice to form. It is recommended tat te minimum speed of te VFD be set at 50 percent of full

speed to minimize te potential for ice to form in te unit.


22/3222

Forced Draft Unit Capacity Control

Te most common metods of capacity control are cycling te single speed fan motors, using

two speed motors or pony motors and utilizing variable frequency drives to control te tower fans.

Altoug capacity control metods for forced draft units are similar to tose used for induced draft

units, tere are sligt variations.

Te simplest metod of capacity control for forced draft units is to cycle te fan(s) on and off.

however, tis metod of control results in larger temperature differentials and periods of time wit

te fans off. Wen te fans are cycled off, te water falling troug te unit can draw air ow into

te fan section. During extremely low ambient conditions, tis moist air may condense and freeze

on te cold components of te drive system. Wen conditions cange and cooling is needed, any

amount of ice tat as formed on te drive system can severely damage te fans and fan safts.

Therefore, fans MUST be cycled during low ambient operation to avoid long periods of idle

fan operation. Excessive cycling can damage the fan motors; limit the number of cycles to

a maximum of six per hour.

Two speed or pony motors offer a better metod of control. Tis additional step of capacity

control will reduce water temperature differentials and te amount of time tat te fans are off.

Tis metod of capacity control as proven effective for applications were load variations areexcessive and cold weater conditions are moderate.

Te use of a variable frequency drive provides te most exible metod of capacity control

for forced draft units. Te VFD control system allows te fans to run at nearly an innite range

of speeds to matc te unit capacity to te system load. During periods of reduced load and

low ambient temperatures, te fans can be maintained at a minimum speed wic will ensure

a positive air ow troug te unit. Tis positive air ow in te unit will prevent moist air from

migrating towards te cold fan drive components reducing te potential for condensation to

form and freeze on tem. Te VFD control system sould be implemented for applications tat

experience uctuating loads and severe cold weater conditions.

Ice ManagementWen operating an evaporative cooling unit in extreme ambient conditions, te formation of ice is

inevitable. Te key to successful operation is to control or manage te amount of ice tat builds up in te

unit. If extreme icing occurs, it can lead to severe operational difculties as well as potentially damaging

te unit. Following tese guidelines will minimize te amount of ice tat forms in te unit leading to better

operation during te cold weater season.

Induced Draft Units

Wen operating an induced draft unit during te cold weater season, te control sequence must

ave a metod to manage te formation of ice in te unit. Te simplest metod of managing te

amount of ice buildup is by cycling te fan motors off. During tese periods of idle fan operation,

te warm water tat is absorbing te building load ows over te unit to elp melt te ice tat as

formed in te ll, basin or louver areas.

WARNING

Using tis metod will cause blow tru, resulting in splas-out and ice formation. To help

prevent blow thru and splash-out, maintain a minimum 50% fan speed, consult your local

legislation as described in the section Capacity Control.

In more severe climates, te incorporation of a defrost cycle can be used to manage te formationof ice in te unit. During te defrost cycle, te fans are reversed at half speed wile te system

pump ows water troug te units water distribution system. Operating te unit in reverse will

melt any ice tat as formed in te unit or on te air intake louvers. Please note tat te fans may


23/3223

need to be cycled off prior to a defrost cycle to allow te water temperature to rise. The defrost

cycle requires the use of two speed motors with reverse cycle starters or reversible

variable frequency drives. All motors supplied by EVAPCO are capable of reverse operation.

Te defrost cycle sould be incorporated into te normal control sceme of te cooling tower

system. Te control system sould allow for eiter a manual or automatic metod of controlling

frequency and lengt of time required to completely defrost te ice from te unit. Te frequency

and lengt of te defrost cycle is dependent on te control metods and ambient cold weater

conditions. Some applications will build ice quicker tan oters wic may require longer and more

frequent defrost periods. Frequent inspection of the unit will help ne tune the length and

frequency of the defrost cycle.

Forced Draft Units

Defrost cycles are NOT recommended for forced draft units, since allowing te leaving water

temperature set point to rise causes te fans to be off for very long periods of time. Tis is

not recommended for forced draft towers because of te potential for freezing te fan drive

components. Terefore, te defrost cycle is an inappropriate metod of ice management for forced

draft units. however, low speed fan operation or variable frequency drives maintain a positive

pressure in te unit wic elps prevent ice formation on te fan drive components.

For more information on cold weater operation, please request a copy of EVAPCOs Engineering

Bulletin 23

Replacement Parts

EVAPCO as replacement parts available for immediate sipment. Most orders sip witin 24

ours from time of order!

To order replacement parts, please visit www.evapco.eu to nd your local contact.


24/3224

AT / UAT 2,4 and 2,6 m WIDE CELLS

FAN & FILL

CASING SECTION

PAN SECTION

DRIFT ELIMINATORS

FAN

FILL

SPRAY BRANCHACCESS DOOR

TEFC FAN MOTOR

FAN MOTOR SHEAVE

FAN BELT

SWING OUT

MOTOR COVER

FAN SCREEN

FAN CYLINDER

BEARING SUPPORT

FAN SHAFT

BEARING

FAN SCREEN

SUPPORT

MAKE-UP VALVE

WITH ADJUSTABLE FLOAT

WATER OUTLET

CONNECTION

COLD WATER BASIN

FRAMED AIR

INLET LOUVER

AIR INLET

LOUVER MEDIA

SUCTION HOOD

& STRAINER


25/3225

AT / UAT 3; 3,6 and 4,2 m WIDE CELLS

FAN & FILL

CASING SECTION

PAN SECTION

FRAMED AIR

INLET LOUVER

WATER OUTLET

CONNECTION

SUCTION HOOD

& STRAINER

MAKE-UP VALVE


COLD WATER BASIN

AIR INLET

LOUVER MEDIA

FAN SCREEN

FAN SCREEN SUPPORT

FAN

ACCESS DOOR

TEAO FAN MOTOR

DRIFT ELIMINATORS

FILL

WATER DISTRIBUTIONSPRAY BRANCH

MECHANICALEQUIPMENT SUPPORT

SLIDING MOTOR BASEALUMINUM FAN SHEAVE

FAN BELT

FAN CYLINDER


26/3226

AT 1,2 m WIDE UNITS

FAN & FILL

CASING SECTION

AIR INLET LOUVER

SUCTION HOOD & STRAINERS

MAKE-UP VALVE


OUTLET CONNECTION

FAN CYLINDER

FAN SCREENFAN SCREEN SUPPORT

FAN

TEAO FAN MOTOR

WATER INLET CONNECTION

WATER DISTRIBUTION SPRAY BRANCH(UNDER DRIFT ELIMINATOR SUPPORT)

DRIFT ELIMINATOR

FILLACCESS DOOR

PAN SECTION


27/3227

LRT UNITS

FILL CASING

SECTION

PAN SECTION

WATER OUTLET

CONNECTION

ACCESS DOOR

MOTOR ACCESS DOOR

SUCTION HOOD

SUCTION STRAINER

FAN SHEAVE

FAN BELT

FAN WHEEL

MAKE-UP VALVE


TEFC FAN MOTOR

FAN HOUSING

FAN WRAPPER

WATER INLET

CONNECTION

FILL

WATER DISTRIBUTION

SPRAY BRANCH

DRIFT ELIMINATORS

DRIFT ELIMINATOR

SUPPORT

FILL SUPPORT CHANNEL

WATER DISTRIBUTION

SPRAY BRANCH SUPPORT

CASING


28/3228

LSTA UNITS - 1,2 and 1,6 m WIDE UNITS

FILL CASING

SECTION

PAN SECTION

DRIFT ELIMINATORS

FILL

WATER DISTRIBUTION

SPRAY BRANCH

WATER INLET

CONNECTION

CASING

FILL SUPPORT CHANNEL

WATER DISTRIBUTION


MOTOR COVER

FAN HOUSING

BEARING

SUPPORT

MIGRATION

BAFFLE

ACCESS

DOOR

MOTOR BASE

SUCTION STRAINER

MAKE-UP VALVE


WATER OUTLET

CONNECTION


29/3229

LSTA UNITS - 2,4 and 3 m WIDE UNITS

FILL CASING

SECTION

PAN SECTION

MIGRATION

BAFFLE

ACCESS

DOOR

BEARING

SUPPORT

FAN HOUSING

MOTOR BASE

WATER OUTLET

CONNECTION

OUTLET HOOD

& STRAINER

FAN SCREENS NOT

SHOWN FOR CLARITY

DRIFT ELIMINATORS

FILL

WATER DISTRIBUTION

SPRAY BRANCH

WATER INLET CONNECTION

CASINGFILL SUPPORT CHANNEL

WATER DISTRIBUTION



30/3230

AT / UAT WITH SUPER LOW SOUND FAN - 2,4 and 2,6 m WIDE CELLS

FAN & FILL

CASING SECTION

PAN SECTION

MAKE-UP VALVE


WATER OUTLET

CONNECTION

COLD WATER BASIN

FRAMED AIR

INLET LOUVER

AIR INLET

LOUVER MEDIA

SUCTION HOOD

& STRAINER

ACCESS DOOR

FAN BELT

FAN MOTOR SHEAVE

TEFC FAN MOTOR

SWING OUT

MOTOR COVER

FAN CYLINDER

BEARING SUPPORT

FAN SCREENFAN SCREEN

SUPPORT

SUPER LOW SOUND FAN

FAN SHAFT

FAN BEARING

DRIFT ELIMINATORS

FILL

WATER DISTRIBUTION

SPRAY BRANCH


31/3231

FAN & FILL

CASING SECTION

PAN SECTION

FRAMED AIR

INLET LOUVER

WATER OUTLET

CONNECTION

SUCTION HOOD

& STRAINER

MAKE-UP VALVE


COLD WATER BASIN

AIR INLET

LOUVER MEDIA

ACCESS DOOR

TEAO FAN MOTOR

SLIDING MOTOR BASE

MECHANICALEQUIPMENT SUPPORT

FAN SCREEN

SUPER LOW SOUND FAN

FAN SCREENSUPPORT

FAN CYLINDER

DRIFT ELIMINATORS

FILL

ALUMINUM FAN SHEAVE

FAN BELT

SPRAY BRANCH

AT / UAT WITH SUPER LOW SOUND FAN - 3; 3,6 and 4,2 m WIDE CELLS


32/32

Documents

MAINT COOLING TOWER OPEN TYPE.pdf