Closed Circuit Coolers - Tasman Cooling Towers

Maintenance Free 

ZM Water 

Distribution 

System 

Closed Circuit Coolers 

FEATURING THE EXCLUSIVE THERMAL-PAK ® COIL 

L OW S OUND, FORCED D RAFT 

C LOSED C IRCUIT C OOLERS 

Mr. GoodTower ® 

® 

Bulletin 250 

LRW STANDARD WITH 

STAINLESS STEEL COLD 

WATER BASIN! 

Member MCAA 

Mechanical Contractors Association of America

Since its founding in 1976, EVAPCO, Inc. 

An emphasis on research and development has 

led to many product innovations – a hallmark 

of EVAPCO through the years. 

The ongoing R & D Program enables EVAPCO 

to provide the most advanced products in the 

industry – technology for the future, available 

today. 

2 

has become a world wide leader in sup- 

plying quality equipment to the Industrial 

Refrigeration, HVAC, and Process Cooling 

Industries. 

EVAPCO’s success has been the result of a con- 

tinual commitment to product improvement, 

quality workmanship and a dedication to pro- 

viding unparalleled service. 

With 14 facilities in 7 countries and over 160 

sales offices in 42 countries world-wide, 

Evapco is ready to assist in all your evaporative 

cooling needs. 

©2004 EVAPCO, Inc. 

LSWA & LRW Design and Construction 

Features 

The LSWA and LRW units are a result of EVAPCO’s extensive 

experience in forced draft centrifugal fan designs. Both models 

are designed for easy maintenance and long, trouble free operation. 

G-235 Heavy Mill-Dip 

Galvanized Steel Construction 

(Stainless steel available 

as an affordable option) 

Double-Brake Flange Joints 

• Stronger than single-brake 

designs by others. 

• Minimizes water leaks at field joints. 

• Greater structural integrity. 

Totally Enclosed 

Pump Motors 

• Help assure long, 

trouble-free operation. 

Stainless Steel Strainer 

• Resists corrosion better than other materials. 

Exclusive Thermal-Pak Coil 

• Providing Maximum Efficiency Per Plan Area 

Efficient Drift Eliminators 

• Patented design incorporates a hooked leaving edge 

designed to direct discharge air away from fresh air 

intake. 

• Corrosion resistant PVC for long life. 

Totally Enclosed Fan Motors 

• Assures long life. 

• All normal maintenance can be performed 

quickly from outside the unit. 

• If required, motor may be easily removed.

The superior LRW design features: 

• Low Rigging Costs • Low Installed Costs 

• Low Silhouette • Low Maintenance • Low Sound 

Zero Maintenance PVC Spray Distribution Header 

with ZM Nozzles 

• Nozzles are threaded into header at proper orientation. 

• Fixed position nozzles require zero maintenance. 

• Large orifice nozzles prevent clogging. 

• Threaded end caps for ease of cleaning. 

Easy to Service Motor 

& Drive System 

• Belt tensioning and bearing lubrication 

can be performed from outside 

the unit. 

• Locking mechanism can 

also be used as a wrench to adjust the 

belts. 

• Motor is fully accessible by 

removing one inlet screen. 

• Split fan housings allow 

removal of all mechanical equipment 

through the end of the unit. 

Standard Stainless Steel 

Cold Water Basin 

• Eliminates the need for 

unreliable epoxy coatings. 


• Advanced design limits maximum drift rate 

to 0.001% of circulated spray water rate. 

• Corrosion resistant PVC for long life. 

Stainless Steel Strainers 

G-235 Heavy 

Mill-Dip Galvanized 

Steel Construction 

(Stainless steel available 

as an affordable option) 

Totally Enclosed 

Pump Motors 

• Helps assure long, 

trouble-free operation. 

Double-Brake Flange Joints 

• Stronger than single-brake 

designs by others. 

• Minimizes water leaks at field joints. 

• Greater structural integrity. 

• Superior resistance to corrosion. 

3

LSWA & LRW Owner Advantages 

4 

Maintenance Free ZM Spray Nozzle Water Distribution System 

EVAPCO’S Zero Maintenance ZM Spray Nozzle remains 

clog-free while providing even and constant water distribution. 

The ZM nozzle provides reliable, scale-free evaporative cooling 

under all operating conditions continuously delivering 6 GPM 

to every square foot of coil plan area. 

The heavy duty nylon ZM Spray nozzles have a 1-5/16” 

diameter opening and a 1-1/2” splash plate clearance enabling 

EVAPCO to use 75% fewer nozzles. Furthermore, the fixed 

position ZM nozzles are mounted in corrosion-free PVC water 

Cooling Coil 

All Evapco Closed Circuit Coolers utilize EVAPCO’s patented 

Thermal-Pak ® coil design which assures greater operating 

efficiency. The elliptical tube design allows for closer tube spacing, 

resulting in greater surface area per plan area than roundtube 

coil designs. In addition, the Thermal-Pak ® design has 

lower resistance to airflow and also permits greater water loading, 

making the Thermal-Pak ® coil the most effective design 

available. 

Thermal-Pak ® Coil by EVAPCO 

Round Tube Coil by Others 

distribution pipes that have threaded end 

caps. Together, these elements combine 

to provide unequaled coil coverage, scale 

prevention and make the industry’s best 

performing non-corrosive, maintenancefree 

water distribution system. 

The coils are manufactured from high quality steel tubing 

following the most stringent quality control procedures. 

Each circuit is inspected to assure the material quality and 

then tested before being assembled into a coil. Finally, the 

assembled coil is tested at 400 psig air under water to make 

sure it is leak free. 

To protect the coil against corrosion, it is placed in a heavy 

steel frame and then the entire assembly is dipped in molten 

zinc (hot dip galvanized) at a temperature of approximately 

800°F. 

Note: Closed Circuit Coolers should only be used on sealed, 

pressurized systems. Continual aeration of the water in an 

open system can cause corrosion inside of the tubes of the 

cooler leading to premature failure. 

Thermal-Pak ® Coil 

U.S. Patent No. 4,755,331 

ZM Nozzle


An extremely efficient drift eliminator system is standard on 

EVAPCO Closed Circuit Coolers. The system removes entrained 

water droplets from the air stream to limit the drift rate. With a 

low drift rate, EVAPCO Closed Circuit Coolers save valuable 

water and water treatment chemicals. The coolers can be 

located in areas where minimum water carryover is critical, 

such as parking lots. 

The drift eliminators are constructed of an inert polyvinyl 

chloride (PVC) plastic material which effectively eliminates 

corrosion of these vital components. They are assembled in 

sections to facilitate easy removal for inspection of the water 

distribution system. 

LSWA Eliminator 

LRW Drift Eliminator 

Drift Eliminators Removed for Coil Inspection 

LSWA/LRW Materials of Construction 

EVAPCO uses premium materials of construction as standard 

on its evaporative cooling equipment. By combining corrosion 

free materials such as PVC water distribution systems, PVC 

drift eliminators, stainless steel strainers and heavy gauge 

G-235 mill hot-dip galvanized steel, the LSWA and LRW closed 

circuit coolers provide the longest equipment life with the best 

value. 

In addition to the above materials of construction, the LRW is 

standard with a stainless steel cold water basin. Optional 

upgrades to stainless steel water touch basins, stainless steel 

water touch units and all stainless steel construction are also 

available on the LRW. 

The LSWA is also available with optional stainless steel cold 

water basins, water touch basins, water touch units and all 

stainless steel construction. 

For more information on these stainless steel options, see 

EVAPCO Engineering Bulletin No. 37 “Selecting Stainless Steel 

Material Options for LR and LS Series”. 

Capacity Control 

There are several options available to save energy while 

maintaining leaving fluid temperature. Two speed motors 

and variable frequency drives both offer energy savings and 

capacity control at low expense. 

Utilizing a two speed motor (1800/900 RPM) gives capacity 

steps of 10% (fans off), 60% (fans half speed) and 100% 

(fans high speed). In most cases, these control steps allow 

the performance level of the cooler to closely match the system 

off-peak load. 

A variable frequency drive will provide the same advantages 

as a two speed motor with better control of the leaving fluid 

temperature. Energy savings should also be greater with the 

infinite steps of capacity control that a VFD can provide. 

5

LSWA & LRW Design Features 

6 

Application Versatility 

Centrifugal units are recommended for a wide range of installations. They are quiet, can easily be hidden, and the increase in the fan 

HP over propeller fan units is generally not significant in the small size range. They are also excellent for installations where sound is 

sensitive, such as residential neighborhoods and when the unit must handle external static pressure. 

Centrifugal Fan Assembly 

Fans on LSWA and LRW Closed 

Circuit Coolers are of the forward 

curved centrifugal design with 

hot-dip galvanized steel construction. 

All fans are statically and 

dynamically balanced and are 

mounted in a hot-dip galvanized 

steel housing. 

Very Quiet Operation 

Centrifugal Fan 

Centrifugal fan units operate at low sound levels which make 

this design preferred for installations with external static 

pressure where noise is a concern. Additionally, since the 

sound from the fans is directional, single sided air entry 

models can be turned away from critical areas avoiding a sound 

problem. When even quieter operation is necessary, centrifugal 

fan models can be equipped with optional sound attenuation 

packages. See page 14 of this catalog or consult the factory for 

details. 

In addition, the LRW features a specially engineered fan enclosure 

and drive system that is designed to offer very quiet operation 

without the high cost of external attenuation packages. The LRW 

fan system was developed through hundreds of hours of laboratory 

tests resulting in the lowest standardized sound levels available 

in the industry. In fact, the sound level of the LRW on average is 

2 dBA quieter than competitor’s similar models. 

Indoor Installation 

Centrifugal units may be installed indoors where it is desirable 

to hide the unit or when limited space is available, and they can 

handle the external static pressure of ductwork. 

The units are designed to be easily connected to ductwork. 

Drawings are available from the factory which illustrate how to 

make these ductwork connections.

Fan Motor Mount 

TEFC fan motors are mounted in a convienent open area for 

ease of belt tensioning, motor lubrication and electrical 

connection. The motor base is designed for easy adjustment 

and to be locked into position to maintain proper belt tension. 

Accessibility 

LSWA Fan Motor Mount 

LRW Fan Motor Mount (shown with optional pony motor) 

The basin/fan section of a centrifugal fan unit is designed for 

accessibility and ease of maintenance. Fan and drive components 

are positioned to allow easy adjustment and cleaning. All grease 

fittings are in convenient locations for periodic lubrication. 

Large circular access doors are provided to allow entry into the 

basin. All float valve and strainer assemblies are located near 

the door for easy adjustment and cleaning. The sump is 

designed to catch the dirt accumulated. This can be flushed out 

simply with a hose. The stainless steel strainers may be easily 

removed for periodic cleaning. 

LRW Reduced Height and Maintenance Accessibility 

The LRW has been designed to satisfy installation requirements 

where height limits must be observed. The lower profile design 

of the LRW does not, however, sacrifice maintenance accessibility 

for reduced height. Its unique casing design allow the water 

distribution system, cold water basin, fan section and other unit 

components to be easily maintained. 

Small, light weight sections of the drift eliminators can be easily 

removed to access the water distribution system. Large circular 

access doors are located on the sides of the cold water basin to 

allow adjustment of the float assembly, removal of the stainless 

steel strainers and cleaning of the basin. The fan motor and 

drive system are located at one end of the unit and are completely 

accessible by removing the inlet screens. Routine bearing 

lubrication and belt tensioning can be performed from the 

exterior of the unit without removing the inlet screens. 

Low Installed Costs 

The compact, unitary design of the 

LRW closed circuit cooler allows 

them to be shipped completely 

assembled. This results in lower 

transportation costs and no 

assembly requirements at the job 

site. Note: Options such as sound 

attenuation and discharge hoods 

will require additional lifts and 

some minor assembly. 

Transport of a Pre-Assembled Unit 

Since the LRW ships fully assembled, they are ideal for 

truck-mounted applications, for remote sites or temporary 

installations. 

M 

M 

H 

7

Engineering Data & Dimensions 

H 

8 

5' – 1 1/8" 

15 

ACCESS 

DOOR 

1/2 F.P.T. VENT 

4 FLUID IN 

4 FLUID OUT 

H 

1 M.P.T. 

MAKE-UP 

2 F.P.T. 

OVERFLOW 

2 M.P.T. DRAIN 

5' – 5 1/2" 

3' – 7 1/2" 

ACCESS 

DOOR 2 M.P.T. 

OVERFLOW 

1 M.P.T. 

MAKE-UP 

LSWA 41A TO 41C 

19 1/8 

11' – 11 3/4" 

4 FLUID IN 

4 FLUID OUT 


4' – 5/8" 19' – 1/8" 



LSWA 20AA TO 20C 

LSWA 20AA TO 20C 



13 1 / 8 5' – 11 7/8" 13 1 / 8 


12 18' 




LSWA 58A TO 58D LSWA 87A TO 87D 

131/ 8 11' – 11 1/2" 13 1/ 8 18' – 1/8" 


8' – 11 1/4" 


LSWA 58A TO 58D 


NOTE: The number of 

coil connections doubles 

when flow rate exceeds 

450 GPM on Models 

20AA thru 87D 

Model 

Weights Fans Spray Pump ■ Remote Sump Dimensions 

Number Shipping Operating Heaviest Section† HP* CFM HP GPM Gallons Req'd ** Conn. Size Coil Volume Gallons Height Length 

LSWA 20AA 2250 3310 2250†† 5 12100 3/4 120 80 4" 41 6' 8 5/8" 5' 11 7/8" 

20A 2670 3840 1680 5 11900 3/4 120 80 4" 59 7' 4 1/8" 5' 11 7/8" 

20B 3030 4310 2040 5 11700 3/4 120 80 4" 77 7' 11 5/8" 5' 11 7/8" 

20C 3470 4870 2430 7.5 13100 3/4 120 80 4" 95 8' 7 1/8" 5' 11 7/8" 

LSWA 30A 3850 5610 2430 7.5 17800 1 180 120 6" 83 7' 4 1/8" 8' 11 1/4" 

30B 4450 6380 3000 10 19200 1 180 120 6" 109 7' 11 5/8" 8' 11 1/4" 

30C 5050 7160 3590 10 18800 1 180 120 6" 135 8' 7 1/8" 8' 11 1/4" 

LSWA 41A 4920 7370 3170 10 23800 1 1/2 245 170 6" 110 7' 4 1/8" 11' 11 3/4" 

41B 5770 8450 3960 15 26000 1 1/2 245 170 6" 147 7' 11 5/8" 11' 11 3/4" 

41C 6550 9480 4750 15 26200 1 1/2 245 170 6" 184 8' 7 1/8" 11' 11 3/4" 

LSWA 58A 6850 10010 4360 15 38800 1 1/2 245 170 6" 157 9' 3/4" 11' 11 1/2" 

58B 7960 11470 5470 15 38000 2 345 230 6" 209 9' 9 1/4" 11' 11 1/2" 

58C 9100 12950 6580 20 37000 2 345 230 6" 261 10' 5 3/4" 11' 11 1/2" 

58D 10210 14410 7700 20 36300 2 345 230 6" 313 11' 2 1/4" 11' 11 1/2" 

LSWA 61A 7460 10830 7460 15 35800 2 365 250 8" 164 7' 4 1/8" 18' 

61B 8650 12380 8650 20 38600 2 365 250 8" 218 7' 11 5/8" 18' 

61C 9840 13290 9840 20 37800 2 365 250 8" 272 8' 7 1/8" 18' 

LSWA 87A 10470 14760 6690 20 52500 3 515 340 8" 234 9' 3/4" 18' 1/8" 

87B 12200 16990 8330 25 55600 3 515 340 8" 312 9' 9 1/4" 18' 1/8" 

87C 13870 19180 9990 25 53800 3 515 340 8" 390 10' 5 3/4" 18' 1/8" 

87D 15590 21420 11660 30 52700 3 515 340 8" 468 11' 2 1/4" 18' 1/8" 

† Heaviest section is the coil section 

†† Model Normally Ships in One Piece 

* For external static pressure up to 1/2", use next larger size fan motor 

* For dry operation, use next larger size fan motor 

■ Remote Sump Configuration 

When a remote sump arrangement is selected, the spray pump, suction strainer and associated piping 

are omitted; the unit is provided with an oversized outlet to facilitate drainage to the remote sump. 

** Gallons shown is water in suspension in unit and piping. Allow for additional water in bottom of remote sump to cover pump suction and strainer during 

operation (12" would normally be sufficient). 

Unit dimensions may vary slightly from catalog. See factory certified prints for exact dimensions.

Selections for LSWA and LRW closed circuit coolers can be made by using EVAPCO’s computer selection software. 

This software provides quick and accurate selections at the click of a mouse. In addition to selections, the program 

displays unit drawings, coil pressure drop, sound data as well as dimensional and shipping information. Please 

contact your local sales representative for information on accessing this software program. 


H 

18" 

7' – 3 3/8" 


4 FLUID IN 

4 FLUID OUT 

ACCESS 

DOOR 

2 M.P.T. 

MAKE-UP 

3 M.P.T. 

OVERFLOW 


7' – 10" 

LSWA P182A TO P182D 

24' – 1" 

18 5/8" 

Coil connections are available as beveled for welding, MPT and flanged. 





Model 


Number Shipping Operating Heaviest Section† HP* CFM HP GPM Gallons Req'd ** Conn. Size Coil Volume Gallons Height Length 

LSWA P91A 10670 16450 7040 25 52400 5 570 360 10" 216 11' 1/4" 11' 11 3/4" 

P91B 12480 18900 8770 30 54600 5 570 360 10" 286 11' 7 3/4" 11' 11 3/4" 

P91C 14290 21330 10490 40 58900 5 570 360 10" 354 12' 3 1/4" 11' 11 3/4" 

P91D 16020 23700 12220 40 57700 5 570 360 10" 424 12' 10 3/4" 11' 11 3/4" 

LSWA P135A 15490 24110 10320 40 80100 7 1/2 840 530 12" 322 11' 1/4" 18' 

P135B 18130 27710 12960 40 78500 7 1/2 840 530 12" 426 11' 7 3/4" 18' 

P135C 20720 31250 15490 50 82900 7 1/2 840 530 12" 530 12' 3 1/4" 18' 

P135D 23310 34790 18080 50 81200 7 1/2 840 530 12" 634 12' 10 3/4" 18' 

LSWA P182A 21080 32730 7040 (2) 25 104700 (2) 5 1140 720 (2) 10" 432 11' 1/4" 24' 1" 

P182B 24700 37640 8770 (2) 30 109100 (2) 5 1140 720 (2) 10" 572 11' 7 3/4" 24' 1" 

P182C 28310 42500 10490 (2) 40 117700 (2) 5 1140 720 (2) 10" 708 12' 3 1/4" 24' 1" 

P182D 31770 47250 12220 (2) 40 115300 (2) 5 1140 720 (2) 10" 848 12' 10 3/4" 24' 1" 

LSWA P270A 30710 48060 10320 (2) 41 160200 (2) 7 1/2 1680 1060 (2) 12" 644 11' 1/4" 36' 1 1/2" 

P270B 36000 55250 12960 (2) 42 157100 (2) 7 1/2 1680 1060 (2) 12" 852 11' 7 3/4" 36' 1 1/2" 

P270C 41170 62340 15490 (2) 50 165800 (2) 7 1/2 1680 1060 (2) 12" 1060 12' 3 1/4" 36' 1 1/2" 

P270D 46340 69420 18080 (2) 51 162400 (2) 7 1/2 1680 1060 (2) 12" 1268 12' 10 3/4" 36' 1 1/2" 

†Heaviest section is the coil section 



17 



11' – 11 3/4" 







P91A thru P135D and 


P182A thru P270D. 



Unit dimensions may vary slightly from catalog. See factory certified prints for exact dimensions. 

24 7/8" 



18" 

36' – 1 1/2" 

24 7/8" 19 3/4" 




9


3 M.P.T. 

DRAIN 

10 

30-3/8" 

(2)ACCESS 

DOOR 

57" 

(2)4 FLUID IN 

(2)4 FLUID OUT 

9' 9-3/4" 

2 M.P.T. 

MAKE-UP 

3 F.P.T. 

OVERFLOW 

A 

3-1/2" 

4-5/8" 

8'-5 1/2" 

17 L 

17 

H 

17 

L 

26 





26 L 

21 

L 





116A thru 174D and 


232A thru 348D. 

Model 

Weights Fans Spray Pump ■ Remote Sump 

Dimensions 

Number Shipping Operating Heaviest Section† HP* CFM HP GPM Gallons Req'd ** Conn. Size Coil Volume Gallons Height Length A 

LSWA 116A 13790 21520 8530 40 75800 5 685 410 

10" 314 12' 6 1/4" 11' 11 3/4" 22 1/4" 

116B 16000 24570 10740 40 74400 5 685 410 

10" 418 13' 2 3/4" 11' 11 3/4" 30 3/4" 

116C 18210 27610 12940 40 72200 5 685 410 

10" 522 13 11 1/4" 11' 11 3/4" 39 1/4" 

116D 20420 30650 15150 40 70800 5 685 410 

10" 626 14' 7 3/4" 11' 11 3/4" 47 3/4" 

LSWA 174A 20370 31680 12380 (2) 25 107200 7 1/2 1030 600 

12" 468 12' 6 1/4" 18' 1/4" 22 1/4" 

174B 23740 36270 15500 (2) 30 112200 7 1/2 1030 600 

12" 624 13' 2 3/4" 18' 1/4" 30 3/4" 

174C 27040 40820 18680 (2) 30 108700 7 1/2 1030 600 

12" 780 13 11 1/4" 18' 1/4" 39 1/4" 

174D 30350 45380 21870 (2) 30 106200 7 1/2 1030 600 

12" 936 14' 7 3/4" 18' 1/4" 47 3/4" 

LSWA 232A 26770 41920 9710 (2) 40 151600 (2) 5 1370 820 

12" 628 12' 6 1/4" 24' 3/4" 22 1/4" 

232B 31110 47900 10740 (2) 40 148800 (2) 5 1370 820 

12" 836 13' 2 3/4" 24' 3/4" 30 3/4" 

232C 35440 53870 12940 (2) 40 144400 (2) 5 1370 820 

12" 1044 13 11 1/4" 24' 3/4" 39 1/4" 

232D 39770 59840 15150 (2) 40 141600 (2) 5 1370 820 

12" 1252 14' 7 3/4" 24' 3/4" 47 3/4" 

LSWA 348A 40140 62890 14450†† (4) 25 214400 (2) 7 1/2 2060 1500 

14" 936 12' 6 1/4" 36' 2" 22 1/4" 

348B 46880 72060 15500 (4) 30 224400 (2) 7 1/2 2060 1500 

14" 1248 13' 2 3/4" 36' 2" 30 3/4" 

348C 53490 81170 18680 (4) 30 217400 (2) 7 1/2 2060 1500 

14" 1560 13 11 1/4" 36' 2" 39 1/4" 

348D 60100 90280 21870 (4) 30 212400 (2) 7 1/2 2060 1500 

14" 1872 14' 7 3/4" 36' 2" 47 3/4" 

†Heaviest section is the coil section 

†† Heaviest section is the pan section 



LSWA 116A to 116D LSWA 174A to 174D 

LSWA 232A to 232D LSWA 348A to 348D 







Unit dimensions may vary slightly from catalog. See factory certified prints for exact dimensions.






20-1/4 

4 MPT 4 FLUID FLUID IN IN 

4 MMPT 4 FLUID FLUID OUT OUT 

3' 4-1/2" 

T 

5-1/4† 

2 MPT 1 MPT 

OVERFLOW MAKE-UP 

2 MPT 

DRAIN 

C 

36-1/4 

H 

30-3/8 

4 MPT 4 FLUID REFRIG IN IN 

4 MPT 4 FLUID REFRIG OUT OUT 

3 MPT 

OVERFLOW 

5' 5/8" 

2 MPT 

DRAIN 

T 

5-1/4 

1 MPT 

MAKE-UP 


† Dimension is 12-3/4” for models LRW 18-0, 18-1, 18-2, 29-0, and 29-1. 


* For external static pressure up to 1/2”, use next larger size fan motor. are omitted; the unit is provided with an oversized outlet to facilitate drainage to the remote sump. 

* For dry operation, use next larger size fan motor. 

** Gallons shown is water in suspension in unit and piping. Allow for additional water in bottom of remote sump to cover pump 

suction and strainer during operation (12” would normally be sufficient). 


11 

C 

36-1/4 

H 

13-1/8 

(1) ACCESS 

DOOR 

LRW 18 LRW 29 thru 58 LRW 18 thru 58 


L 

Note: The number of coil connections doubles when the 

flow rate exceeds 425 GPM on Models LRW 18 thru LRW 58. 


Model Gallons Conn. Coil Volume 

Number Shipping Operating HP* CFM HP GPM Req’d** Size Gallons H T C L G 

LRW 18-0 2,320 3,560 2 8,340 1/2 100 80 4” 33 6’ 7-3/4” 12” 43-1/2” 10’ 1-7/8” 5’ 3-7/8” 

18-1 2,330 3,570 3 9,550 1/2 100 80 4” 33 6’ 7-3/4” 12” 43-1/2” 10’ 1-7/8” 5’ 3-7/8” 

18-2 2,340 3,580 5 11,320 1/2 100 80 4” 33 6’ 7-3/4” 12” 43-1/2” 10’ 1-7/8” 5’ 3-7/8” 

18-3 2,660 4,020 3 9,370 1/2 100 80 4” 49 6’ 7-3/4” 19-1/2” 43-1/2” 10’ 1-7/8” 5’ 3-7/8” 

18-4 2,670 4,030 5 11,110 1/2 100 80 4” 49 6’ 7-3/4” 19-1/2” 43-1/2” 10’ 1-7/8” 5’ 3-7/8” 

18-5 3,010 4,470 3 9,180 1/2 100 80 4” 65 7’ 3-1/4” 27” 51” 10’ 1-7/8” 5’ 3-7/8” 

18-6 3,020 4,480 5 10,890 1/2 100 80 4” 65 7’ 3-1/4” 27” 51” 10’ 1-7/8” 5’ 3-7/8” 

18-7 3,400 4,980 5 10,680 1/2 100 80 4” 81 7’ 10-3/4” 34-1/2” 58-1/2” 10’ 1-7/8” 5’ 3-7/8” 

18-8 3,450 5,020 7.5 12,220 1/2 100 80 4” 81 7’ 10-3/4” 34-1/2” 58-1/2” 10’ 1-7/8” 5’ 3-7/8” 

LRW 29-0 3,540 5,710 5 16,360 1 160 120 6” 52 6’ 7-3/4” 12” 43-1/2” 12’ 2-7/8” 6’ 7-3/4” 

29-1 3,580 5,750 7.5 18,730 1 160 120 6” 52 6’ 7-3/4” 12” 43-1/2” 12’ 2-7/8” 6’ 7-3/4” 

29-2 4,040 6,380 5 16,030 1 160 120 6” 78 6’ 7-3/4” 19-1/2” 43-1/2” 12’ 2-7/8” 6’ 7-3/4” 

29-3 4,130 6,460 7.5 18,370 1 160 120 6” 78 6’ 7-3/4” 19-1/2” 43-1/2” 12’ 2-7/8” 6’ 7-3/4” 

29-4 4,620 7,130 7.5 18,010 1 160 120 6” 104 7’ 3-1/4” 27” 51” 12’ 2-7/8” 6’ 7-3/4” 

29-5 5,210 7,900 7.5 17,650 1 160 120 6” 130 7’ 10-3/4” 34-1/2” 58-1/2” 12’ 2-7/8” 6’ 7-3/4” 

LRW 43-0 5,290 8,760 10 24,690 1-1/2 255 170 6” 117 6’ 7-3/4” 19-1/2” 43-1/2” 15’ 2-1/4” 6’ 7-3/4” 

43-1 5,400 8,870 15 28,280 1-1/2 255 170 6” 117 6’ 7-3/4” 19-1/2” 43-1/2” 15’ 2-1/4” 6’ 7-3/4” 

43-2 6,220 9,960 15 27,740 1-1/2 255 170 6” 156 7’ 3-1/4” 27” 51” 15’ 2-1/4” 6’ 7-3/4” 

43-3 7,090 11,100 15 27,160 1-1/2 255 170 6” 195 7’ 10-3/4” 34-1/2” 58-1/2” 15’ 2-1/4” 6’ 7-3/4” 

43-4 7,840 12,130 15 26,620 1-1/2 255 170 6” 234 8’ 6-1/4” 42” 66” 15’ 2-1/4” 6’ 7-3/4” 

LRW 58-0 6,530 11,230 20 34,880 2 345 240 8” 157 6’ 8-3/4” 19-1/2” 44-1/2” 18’ 2-5/8” 6’ 7-3/4” 

58-1 6,540 11,240 25 37,580 2 345 240 8” 157 6’ 8-3/4” 19-1/2” 44-1/2” 18’ 2-5/8” 6’ 7-3/4” 

58-2 7,640 12,720 20 34,220 2 345 240 8” 209 7’ 4-1/4” 27” 52” 18’ 2-5/8” 6’ 7-3/4” 

58-3 7,650 12,730 25 36,860 2 345 240 8” 209 7’ 4-1/4” 27” 52” 18’ 2-5/8” 6’ 7-3/4” 

58-4 8,740 14,180 25 36,080 2 345 240 8” 261 7’ 11-3/4” 34-1/2” 59-1/2” 18’ 2-5/8” 6’ 7-3/4” 

58-5 8,760 14,200 30 38,360 2 345 240 8” 261 7’ 11-3/4” 34-1/2” 59-1/2” 18’ 2-5/8” 6’ 7-3/4” 

58-6 9,770 15,590 30 37,580 2 345 240 8” 313 8’ 7-1/4” 42” 67” 18’ 2-5/8” 6’ 7-3/4” 

M 

G

12 

24-5/8 44-7/8 

(2) (2) 4 MMPT 4 FLUID T FLUID LUID IN IN 

(2) (2) 4 MPT M4 FLUID FLUID UID OUT OUT 

3 MPT 

OVERFLOW 

7' 10" 






2 MPT 

DRAIN 

T 

5-1/4 

2 MPT 

MAKE-UP 

C 

36-1/4 

H 

13-1/2 



* For external static pressure up to 1/2”, use next larger size fan motor. are omitted; the unit is provided with an oversized outlet to facilitate drainage to the remote sump. 

* For dry operation, use next larger size fan motor. 

** Gallons shown is water in suspension in unit and piping. Allow for additional water in bottom of remote sump to cover pump 

suction and strainer during operation (12” would normally be sufficient). 


L 

(2) ACCESS 

DOORS 

LRW 68 thru 91 LRW 68 thru 91 


Model Gallons Conn. Coil Volume 

Number Shipping Operating HP* CFM HP GPM Req’d** Size Gallons H T C L 

LRW 68-0 8,110 13,760 20 41,820 2 405 250 8” 164 6’ 11-1/2” 19-1/2” 47-1/4” 15’ 2-1/4” 

68-1 8,120 13,770 25 45,010 2 405 250 8” 164 6’ 11-1/2” 19-1/2” 47-1/4” 15’ 2-1/4” 

68-2 9,330 15,350 20 40,970 2 405 250 8” 214 7’ 7” 27” 54-3/4” 15’ 2-1/4” 

68-3 9,340 15,810 25 44,160 2 405 250 8” 214 7’ 7” 27” 54-3/4” 15’ 2-1/4” 

68-4 10,860 17,750 25 43,240 2 405 250 8” 266 8’ 2-1/2” 34-1/2” 62-1/4” 15’ 2-1/4” 

LRW 91-0 11,270 19,510 25 51,560 3 545 360 10” 286 7’ 7” 27” 54-3/4” 18’ 2-5/8” 

91-1 11,300 19,530 30 54,790 3 545 360 10” 286 7’ 7” 27” 54-3/4” 18’ 2-5/8” 

91-2 11,610 19,840 40 60,290 3 545 360 10” 286 7’ 7” 27” 54-3/4” 18’ 2-5/8” 

91-3 12,950 21,730 30 53,650 3 545 360 10” 354 8’ 2-1/2” 34-1/2” 62-1/4” 18’ 2-5/8” 

91-4 13,250 22,020 40 59,060 3 545 360 10” 354 8’ 2-1/2” 34-1/2” 62-1/4” 18’ 2-5/8” 

91-5 14,800 24,130 40 57,920 3 545 360 10” 424 8’ 10” 42” 69-3/4” 18’ 2-5/8” 

M 

79-3/4 

Note: The number of coil connections doubles when the 

flow rate exceeds 850 GPM on Models LRW 68 and LRW 91. 

Coil connections are available as beveled for welding, MPT and flanged.

Electric Basin Heater Package 

If a remote sump configuration is not practical, electric basin 

heater packages are available to help prevent freeze-up of the 

basin water. The package includes electric heater elements and 

a combination thermostat/ low water cutoff. 

Model Number kW (0 

LSWA 20AA-20C 2 

LSWA 30A-30C 3 

LSWA 41A-41C 3 

LSWA 58A-58D 4 

LSWA 61A-61D 5 

LSWA 87A-87D (2) 3 

LSWA P91A-P91D 5 

LSWA 116A-116D 7 

LSWA P135A-P135D (2) 4 

LSWA 174A-174D (2) 5 

LSWA P182A-P182D (2) 5 

LSWA 232A-232D (2) 7 

LSWA P270A-P270D (2) 7 

LSWA 348A-348D (2) 10 

LRW 91 9 

o F)* 

LRW 18 2 

LRW 29 3 

LRW 43 4 

LRW 58 6 

LRW 68 7 

*Electric heater selection based on 0 o F ambient 

temperature. For alternate low ambient heater 

selections, consult factory. 

Electric Water Control 

Closed circuit coolers may be supplied with an electric level 

control in lieu of the standard mechanical float and make-up 

assembly. The package consists of a probe and standpipe 

assembly that controls a slow-closing solenoid valve. The 

standpipe requires heat tracing when used in cold weather conditions 

to prevent freezing. This package provides accurate 

control of the water level and does not require field adjustment. 

Screened Bottom Panels 

Protective inlet screens are provided on the sides and/or end 

of the unit’s air intake. Screens are not provided below the fan 

section since most units are mounted on the roof or at ground 

level. It is recommended that bottom screens be added to the 

unit when it will be elevated. These screens can be provided 

by the factory at an additional cost or added by the installing 

contractor. 

Optional Equipment 

Solid Bottom Panels for Ducted Installations 

When centrifugal fan units are installed indoors and intake air is 

ducted to the unit, a solid bottom panel is required to completely 

enclose the fan section and prevent the unit from drawing air 

from the room into the fan intakes. When this option is ordered, 

air inlet screens are omitted. 

Vibration Isolation 

The fans on EVAPCO closed circuit coolers are balanced and 

run virtually vibration-free. In addition, the rotating mass is 

small in relation to the total mass of the cooler, further reducing 

the possibility of objectionable vibrations being transmitted to 

the building structure. As a result, vibration isolation is generally 

not required. 

However, in those cases where it is determined that vibration 

isolation is necessary, vibration isolators can be furnished. 

Isolators have a 1” deflection and are designed for wind loading 

up to 50 MPH. 

It is important to note that vibration isolation must be installed 

continuously along the full length of the cooler on both sides of 

the unit. Point isolators may be used between the supporting 

steel and building framework but not between the unit and the 

supporting steel. 

Extended Surface Coil 

The LSWA and LRW can be provided with spiral fins on the 

heat exchanger coil to increase the dry performance of the unit. 

Dry performance is accomplished by rejecting heat to the 

atmosphere without the use of the spray pump and the 

evaporation process. Dry operation can be practical in cold 

climates and/or when reduced winter loads exist. The number 

of fins per inch and quantity of rows finned can be varied to 

obtain different dry performance. Dry operation requires the 

next larger size fan motor. Consult the factory for sizing. 

Coil with Extended Spiral Fins 

13

14 

Sound Attenuation Packages 

The centrifugal fan design of the LSWA and LRW models operate 

at lower sound levels which make these units preferable for 

installations where noise is a concern. For extremely noise 

sensitive applications, the LSWA and LRW centrifugal fan 

models may be supplied with various stages of intake and/or 

discharge attenuation packages which greatly reduce sound 

levels. 

Oversized fan motors are required for many of these options in 

order to overcome the additional static pressure. Consult the 

factory for certified sound data for each sound attenuation 

option. 

Straight Sided 

Discharge Attenuation 

(LSWA and LRW) 


Fan Side Inlet Attenuation (LRW Only) 

Reduces sound radiated from the fan side air intakes and has 

an open side to allow for air entry. This attenuation package 

ships loose to be mounted in the field on each side of the 

closed circuit cooler over the fan intakes. 

Fan End Inlet Attenuation 

Reduces sound radiated through the end air intakes. It consists 

of baffled panels to change the path of the air entry and to 

capture the radiated noise thus reducing the overall sound 

levels generated. In addition, the external belt adjustment 

mechanism is extended through the inlet attenuator to allow 

easy belt adjustment without having to enter the unit. 

Discharge Attenuation 

Example of LRW model 

The discharge attenuation hood features a straight sided or 

tapered design with insulated baffles to reduce the overall 

sound levels of the discharge air. The discharge attenuation 

incorporates a large access panel to allow entry to the drift 

eliminators and water distribution system. If a higher discharge 

velocity is required with minimal sound attenuation, a tapered 

discharge hood is available. 

Fan Side Inlet 

Attenuation 

(LRW only) 

Fan End Inlet 

Attenuation 

(LSWA and LRW)

Discharge Hoods with Positive 

Closure Dampers 

When a closed circuit cooler is used in a water-to-air heat 

pump system or in certain process cooling applications, a 

method of reducing the heat loss during idle periods of 

wintertime operation may be required. For these cases, an 

optional discharge hood with positive closure dampers and 

damper actuator is available. 

The discharge hood with dampers is designed to minimize 

the heat loss from convective airflow through an idle cooler. 

Further reductions in heat loss may be obtained with the 

addition of insulation to the hood and casing, minimizing 

conductive heat losses. Insulation may be factory installed 

on the hood and casing or field installed by an insulation 

contractor. 

The discharge hood and dampers are constructed of hot-dip 

galvanized steel. Hoods are equipped with access panels to 

8-1/2 

L 

Access 

Door 


L 

Access 

Door 

facilitate maintenance on the eliminators and water distribution 

system. The dampers, damper actuator and linkage are all 

factory assembled. Actuator controls and wiring are field 

supplied by others. Damper actuators require 120 volt power 

supply. 

The system control sequence should provide for dampers to 

be fully open before the fans are running and closed when the 

fans are off; the damper actuator must be interlocked with 

the temperature control system for this purpose. When a 

centrifugal fan model uses a tapered discharge hood, the 

next larger size fan motor must be used to overcome the 

additional static pressure. 

Heat loss data is provided for standard units without hoods, 

with hoods and with hoods and insulation. Table ratings are 

based on 50°F water in the coil, -10°F ambient and 45 MPH 

winds (fan and pump off). 

10 

Tapered Discharge Hood 

Straight-Sided Discharge Hood 

H 

H 

W 

W 

15

16 

Tapered Discharge Hood Dimensions 

Model Number L (in.) H (in.) W (in.) Weight (lbs.) Number of Hoods 

LSWA 20 71 1/8 28 1/8 23 3/4 350 1 

LSWA 30 106 1/2 28 1/8 23 3/4 525 1 

LSWA 41 142 7/8 28 1/8 23 3/4 700 1 

LSWA 58 142 7/8 34 3/4 31 1/8 854 1 

LSWA 61 215 5/16 28 1/8 23 3/4 1,050 1 

LSWA 87 215 5/16 34 3/4 31 1/8 1,232 1 

LSWA P91 142 7/8 37 7/8 47 3/4 1,220 1 

LSWA 116 142 7/8 45 5/8 60 1/8 1,454 1 

LSWA P135 215 3/8 37 7/8 47 3/4 1,700 1 

LSWA 174 215 5/16 45 5/8 60 1/8 2,124 1 

LSWA P182 142 7/8 37 7/8 47 3/4 1,220 2 

LSWA 232 142 7/8 45 5/8 60 1/8 1,454 2 

LSWA P270 215 3/8 37 7/8 47 3/4 1,700 2 

LSWA 348 215 5/16 45 5/8 60 1/8 2,124 2 

LRW 18 71 3/4 24 3/8 19 1/8 310 1 

LRW 29 71 3/4 39 1/4 29 1/8 470 1 

LRW 43 107 1/4 39 1/4 29 1/8 640 1 

LRW 58 143 5/8 39 1/4 29 1/8 790 1 

LRW 68 107 1/4 42 1/2 44 3/8 900 1 

LRW 91 143 5/8 42 1/2 44 3/8 1,110 1 

Heat Loss Data, MBH 

Model Number Standard Unit With Hood With Hood and Insulation 

LSWA 20AA 37 29 19 

20A 50 33 21 

20B 61 36 23 

20C 68 39 25 

LSWA 30A 76 44 28 

30B 92 48 31 

30C 104 52 33 

LSWA 41A 103 54 35 

41B 124 60 38 

41C 140 65 42 

LSWA 58A 147 70 45 

58B 178 77 49 

58C 200 83 53 

58D 213 90 57 

LSWA 61A 155 76 49 

61B 188 84 54 

61C 211 91 58 

LSWA 87A 223 96 62 

87B 269 105 67 

87C 303 114 73 

87D 322 123 79 

LSWA P91A 227 98 63 

P91B 276 105 67 

P91C 309 112 72 

P91D 329 119 76 

LSWA 116A 294 109 69 

116B 356 117 75 

116C 400 125 80 

116D 426 134 86 

LSWA P135A 311 132 85 

P135B 376 141 90 

P135C 468 150 96 

P135D 499 159 102 

LSWA 174A 445 143 91 

174B 539 153 98 

174C 605 164 105 

174D 644 175 112 

Engineering Data 

Straight-Sided Discharge Hood Dimensions 

Hood dimensions may vary slightly from catalog. See factory certified prints for exact dimensions. 

Model Number L (in.) H (in.) W (in.) Weight (lbs.) Number of Hoods 

LSWA 20 71 1/8 25 1/8 45 1/8 345 1 

LSWA 30 106 1/2 25 1/8 45 1/8 495 1 

LSWA 41 142 7/8 25 1/8 45 1/8 630 1 

LSWA 58 142 7/8 25 1/8 61 1/2 780 1 

LSWA 61 215 5/16 25 1/8 45 1/8 890 1 

LSWA 87 215 5/16 25 1/8 61 1/2 1,180 1 

LSWA P91 142 7/8 25 1/8 93 1/4 1,165 1 

LSWA 116 142 7/8 25 1/8 117 1,710 1 

LSWA P135 215 3/8 25 1/8 93 1/4 1,685 1 

LSWA 174 215 3/8 25 1/8 117 2,495 1 

LSWA P182 142 7/8 25 1/8 93 1/4 1,165 2 

LSWA 232 142 7/8 25 1/8 117 1,710 2 

LSWA P270 215 3/8 25 1/8 93 1/4 1,685 2 

LSWA 348 215 3/8 25 1/8 117 2,495 2 

LRW 18 71 3/4 29 1/2 40 1/2 420 1 

LRW 29 71 3/4 29 1/2 60 5/8 550 1 

LRW 43 107 1/4 29 1/2 60 5/8 750 1 

LRW 58 143 5/8 29 1/2 60 5/8 960 1 

LRW 68 107 1/4 29 1/2 94 1,020 1 

LRW 91 143 5/8 29 1/2 94 1,290 1 

Model Number Standard Unit With Hood With Hood and Insulation 

LSWA P182A 454 196 126 

P182B 552 210 134 

P182C 618 224 144 

P182D 658 238 152 

LSWA 232A 588 217 139 

232B 712 234 150 

232C 799 251 160 

232D 851 267 171 

LSWA P270A 688 264 170 

P270B 834 282 180 

P270C 936 300 192 

P270D 998 318 204 

LSWA 348A 870 285 182 

348B 1078 307 196 

348C 1210 328 210 

348D 1289 349 223 

LRW 18-0, 18-1, 18-2 33 29 22 

LRW 18-3, 18-4 46 36 23 

LRW 18-5, 18-6 54 39 25 

LRW 18-7, 18-8 62 42 27 

LRW 29-0, 29-1 52 44 29 

LRW 29-2, 29-3 72 45 30 

LRW 29-4 87 49 31 

LRW 29-5 98 53 34 

LRW 43-0, 43-1 110 59 38 

LRW 43-2 133 64 41 

LRW 43-3 149 69 44 

LRW 43-4 159 73 47 

LRW 58-0, 58-1 147 74 47 

LRW 58-2, 58-3 178 80 51 

LRW 58-4, 58-5 200 85 55 

LRW 58-6 213 91 59 

LRW 68-0, 68-1 170 77 49 

LRW 68-2, 68-3 205 83 53 

LRW 68-4 231 89 57 

LRW 91-0, 91-1,91-2 276 101 64 

LRW 91-3, 91-4 310 107 69 

LRW 91-5 330 114 73

Design 

Evapco units are heavy-duty construction and designed for long troublefree 

operation. Proper equipment selection, installation and maintenance 

is necessary to ensure good unit performance. Some of the major 

considerations in the application of a cooler are presented below. For 

additional information, contact the factory. 

Air Circulation 

In reviewing the system design and unit location, it is important that proper 

air circulation be provided. The best location is on an unobstructed roof top 

or on ground level away from walls and other barriers. Good engineering 

practice dictates that the closed circuit cooler discharge air not be directed 

or located close to or in the vicinity of building air intakes. 

Care must be taken when locating coolers in wells, enclosures or next to 

high walls. The potential for recirculation of hot, moist discharge air back 

into the fan intake exists. Recirculation raises the wet bulb temperature of 

the entering air causing the leaving fluid temperature to rise above the 

design. For these cases, a discharge hood or ductwork should be provided 

to raise the overall unit height level with the adjacent wall, thereby reducing 

the chance of recirculation. For additional information, see the Evapco 

Equipment Layout Manual. 

Structural Steel Support 

The recommended method of support for Evapco coolers is two structural 

“I” beams located under the outer flanges and running the entire length of 

the unit. Mounting holes 3/4” in diameter, are located in the bottom channels 

of the pan section to provide for bolting to the structural steel; refer to 

certified drawings from the factory for bolt hole locations. 

Beams should be level before setting the unit in place. Do not level the unit 

by shimming between it and the “I” beams as this will not provide proper 

longitudinal support. 

Piping 

Cooler piping should be designed and installed in accordance with generally 

accepted engineering practice. The piping layout should be symmetrical on 

multiple unit systems, and sized for a reasonably low water velocity and 

pressure drop. 

The standard closed circuit cooler is recommended only on a closed, 

pressurized system. The piping system should include an expansion tank 

to allow for fluid expansion and purging air from the system. 

Note: Closed Circuit Coolers should never be used on an open type system. 

An open type system with a cooler will result in premature coil failure. 

The piping system should be designed to permit complete drainage of the 

heat exchanger coil. This will require a vacuum breaker or air vent to be 

installed at the high point and a drain valve installed at the low point of the 

piping system. Both must be adequately sized. 

All piping should be securely anchored by properly designed hangers and 

supports. No external loads should be placed upon the cooler connections, 

nor should any of the pipe supports be anchored to the cooler framework. 

Freeze Protection 

If the units are installed in a cold climate and operated year-round, freeze 

protection must be provided for the heat exchanger coil in the unit as well 

as for the recirculating water system. 

Heat Exchanger Coil 

The simplest and most foolproof method of protecting the heat exchanger 

coil from freeze-up is the use of a glycol solution. If this is not possible, an 

auxiliary heat load must be maintained on the coil at all times so that the 

water temperature does not drop below 50°F when the cooler is shut down. 

Application 

Also, a minimum recommended flow rate must be maintained. Refer to the 

Heat Loss Data Table on page 16. 

Model Number Minimum Flow (GPM) 

LSWA 20, 30, 41, and 61 50 

LSWA 58 and 87 75 

LSWA 116 and 174 150 

LSWA 232 and 348 300 

LSWA P91 and P135 150 

LSWA P182 and P270 300 

LRW 18 50 

LRW 29, 43, and 58 75 

LRW 68 and 91 140 

If an anti-freeze solution is not used, the coil must be drained immediately 

whenever the pump is shut down or flow stops. Care must be taken to 

ensure that the piping is sized to allow the water to flow quickly from the 

coil. This method of freeze control should only be used in an emergency 

situation. Coils should not be drained for an extended period of time. 

The amount of glycol required for a system will depend upon the total volume 

of water in the closed loop and the winter ambient conditions for the installation. 

The Engineering Data Tables presented on pages 8-12 provide the 

water volume contained inside the cooler coils to assist in this calculation. 

Recirculating Water System 

The surest way to protect the recirculating water system from freezing is 

with a remote sump. The remote sump should be located inside the building 

and below the unit. When a remote sump arrangement is selected, the 

spray pump is provided by others and installed at the remote sump. All 

water in the closed circuit cooler basin should drain to the remote sump 

when the spray pump cycles off. 

Other freeze protection methods are available when a remote sump is not 

feasible. Electric pan heaters (see page 13 for optional equipment), steam 

or hot water coils (controls valves and thermostats by others) can be used 

to keep the pan water from freezing when the unit cycles off. Water lines to 

and from the unit, spray pump and related piping should be heat traced and 

insulated up to the overflow level in order to protect from freezing. 

The unit should not be operated dry (fans on, pump off) unless the basin is 

completely drained and the unit has been designed for dry operation. 

Water Treatment 

EVAPCO recommends that all closed circuit cooler users should consult 

with a reputable water treatment company familiar with local water 

conditions in order to determine the extent and type of water treatment 

program recommended for each specific application. Any chemical 

water treatment used must be compatible with the galvanized or stainless 

steel construction of the unit. If acid is used for treatment, it should be 

accurately metered and the concentration properly controlled. The pH of 

the water should be maintained between 6.5 and 8.0. In order to prevent 

“white rust”, galvanized steel may require routine passivation when the 

system is operating in the higher pH levels. 

Batch chemical feeding is not recommended because it does not afford 

the proper degree of control. If acid cleaning is required extreme caution 

must be exercised and only inhibited acids should be used. Consult 

EVAPCO’S Maintenance Bulletin 112 for additional information. 

Control of Biological Contamination 

Water quality should be checked regularly for biological contamination. If 

biological contamination is detected, a more aggressive water treatment 

and mechanical cleaning program should be undertaken. The program 

should be performed in conjunction with a qualified water treatment 

company. It is important that all internal surfaces be kept clean of 

accumulated dirt and sludge. In addition, the drift eliminators should be 

maintained in good operating condition. 

17

18 

Furnish and install as shown on the plans EVAPCO Model(s) 

LSWA ____________ Counter-Flow, Blow Through Closed 

Circuit Cooler. Each unit shall have the capacity to cool 

__________ GPM of __________ from ________ °F to 

__________ °F with a __________°F entering wet bulb 

temperature. Unit height shall not exceed __________feet. 

The cooler(s) shall operate against _____w.g. external static 

pressure. 

Basin and Casing 

The basin and casing shall be constructed of G-235 hot-dip 

galvanized steel for long life and durability. The heat transfer 

section shall be removable from the pan to provide easy 

handling and rigging. The pan/fan section shall include fans 

and drives mounted and aligned at the factory. These items 

shall be located in the dry entering air stream to provide 

maximum service life and easy maintenance. Standard basin 

accessories shall include circular access doors, Type 304 

stainless steel strainers, wastewater bleed line with adjustable 

valve and brass make-up valve with an unsinkable foam filled 

plastic float. 

Fans 

Fans shall be forwardly curved centrifugal type of hot-dip 

galvanized construction. The fans shall be factory installed 

into the pan/fan section, and statically and dynamically 

balanced for vibration-free operation. Fans shall be mounted 

on either a solid steel shaft or a hollow steel shaft with forged 

bearing journals. The fan shaft shall be supported by 

heavy-duty, self-aligning bearings with cast iron housings 

and lubrication fittings for maintenance. 

Drive 

The fan drive shall be V-belt type with taper lock sheaves 

designed for a 1.5 service factor of the motor nameplate 

horsepower. Drives are mounted and aligned at the factory. 

Fan Motor 

Specifications 

__________ HP TEFC ball bearing fan motor(s) with 1.15 

service factor shall be furnished suitable for outdoor service on 

__________ volts, __________ hertz and __________ phase. 

Motor(s) shall be mounted on an adjustable base. 

Heat Transfer Coil 

The coil(s) shall be all prime surface steel, encased in a steel 

framework with the entire assembly hot-dip galvanized after 

fabrication. Coil(s) shall be designed with sloping tubes for free 

drainage of liquid and tested to 400 psig air pressure under 

water. 

Water Distribution System 

The system shall provide a water flow rate of not less than 6 

GPM over each square foot of coil face area to ensure proper 

flooding of the coil. The spray header shall be constructed of 

schedule 40 polyvinyl chloride pipe for corrosion resistance. All 

spray branches shall be removable and include a threaded end 

plug for cleaning. The water shall be distributed over the entire 

coil surface by heavy-duty molded nylon ZM spray nozzles with 

large 1-5/16” diameter openings and internal sludge ring to 

eliminate clogging. Nozzles shall be threaded into the spray 

header to provide easy removal for maintenance. 

Water Recirculation Pump 

The pump(s) shall be a close-coupled, centrifugal type with a 

mechanical seal. Pump motor shall be ___ Horsepower 

T.E.F.C. design suitable for outdoor installation on ___ volts, 

___ hertz, and ___ phase electrical service. 

Eliminators 

The eliminators shall be constructed entirely of inert polyvinyl 

chloride (PVC) that has been specially treated to resist ultraviolet 

light. Assembled in easily handled sections, the eliminator 

blades shall be spaced on 1 inch centers and shall incorporate 

three changes in air direction to assure removal of entrained 

moisture from the discharge air stream. They shall have a 

hooked leaving edge to direct the discharge air away from the 

fans to minimize recirculation. 

Finish 

All pan and casing materials shall be constructed of G-235 

heavy gauge mill hot-dip galvanized steel for maximum 

protection against corrosion. During fabrication, all panel 

edges shall be coated with a 95% pure zinc-rich compound.

Furnish and install as shown on the plans EVAPCO Model(s) 

LRW _________ Counterflow, Blow-Through Closed Circuit 

Cooler with single side air entry to cool ________ GPM of 

_______ from ___°F to ___°F with a ___°F entering wet bulb 

temperature. Unit height shall not exceed _____ feet. The 

cooler(s) shall operate against ____ w.g. external static 

pressure. Closed Circuit Cooler(s) shall be fully assembled 

with all moving parts factory mounted and aligned. 

Cold Water Basin 

The complete cold water basin shall be constructed of Type 304 

stainless steel for long life and durability. Standard cold water 

basin accessories shall include Type 304 stainless steel overflow, 

drain, anti-vortexing hood, strainers, brass make-up valve with 

unsinkable, foam filled plastic float and wastewater bleed line 

with adjustable valve. 

Casing and Fan Section 

The casing and fan section shall be constructed of G-235 

galvanized steel for long life and durability. Fan section shall 

include fans, motors and drives. The entire drive system 

(including fans, motors, sheaves and belts) shall be located 

in the dry entering airstream. 

Centrifugal Fans and Drives 

Fans shall be forwardly curved centrifugal type of hot-dip 

galvanized steel construction. The fans shall be factory installed, 

statically and dynamically balanced for vibration free operation. 

The fans shall be mounted on either a solid steel shaft or a 

hollow steel foam filled shaft with forged bearing journals. 

The fan shaft shall be supported by heavy-duty self-aligning 

bearings with cast iron housings and lubrication fittings 

extended to the outside of the unit for ease of maintenance. 

The fan drive shall be a V-Belt type with taper lock sheaves 

designed for a 1.5 service factor of the motor nameplate 

horsepower. Drives are mounted and aligned at the factory. 

Fan Motor 

Specifications 

Fan motor(s) shall be ___ Horsepower T.E.F.C. design with 

1.15 service factor and suitable for outdoor installation 

on ___ volts, ___ hertz, and ___ phase electrical service. 

Motor(s) shall be mounted on an adjustable base with external 

belt adjustment. 

Water Recirculation Pump 

The pump(s) shall be a close-coupled, centrifugal type with a 

mechanical seal. Pump motor shall be ___ Horsepower 

T.E.F.C. design suitable for outdoor installation on ___ volts, 

___ hertz, and ___ phase electrical service. 

Heat Transfer Coil 

The coil(s) shall be all prime surface steel, encased in a steel 

framework with the entire assembly hot-dip galvanized after 

fabrication. Coil(s) shall be designed with sloping tubes for free 

drainage of liquid and tested to 400 psig air pressure under 

water. 

Water Distribution System 

The system shall provide a water flow rate of not less than 6 

GPM over each square foot of coil face area to ensure proper 

flooding of the coil. The spray header shall be constructed of 

schedule 40 polyvinyl chloride pipe for corrosion resistance. All 

spray branches shall be removable and include a threaded end 

plug for cleaning. The water shall be distributed over the entire 

coil surface by heavy-duty molded nylon ZM spray nozzles with 

large 1-5/16” diameter openings and internal sludge ring to 

eliminate clogging. Nozzles shall be threaded into the spray 

header to provide easy removal for maintenance. 

Eliminators 

The eliminators shall be constructed of inert polyvinyl chloride 

that has been specially treated to resist UV degradation. 

Assembled in easily handled sections, the eliminators shall 

incorporate three changes in air direction to assure removal of 

entrained moisture from the discharge airstream. The maximum 

drift rate shall not exceed 0.001% of the recirculated water rate. 

Finish 

The complete cold water basin shall be constructed of Type 304 

stainless steel for maximum corrosion protection. The casing 

and fan section shall be constructed of G-235 heavy gauge mill 

hot-dip galvanized steel. During fabrication, all galvanized panel 

edges shall be coated with a 95% pure zinc compound. 

19

World Headquarters/ 

Research and 

Development Center 

EVAPCO Locations 

World Headquarters 

Research/Development Center 

EVAPCO, Inc. 

P.O. Box 1300 

Westminster, MD 21158 USA 

Phone: (410) 756-2600 

Fax: (410) 756-6450 

E-mail: marketing@evapco.com 

Asia/Pacific Regional Office 

EVAPCO China 

Suite D, 23rd Floor 

Majesty Building 

138 Pudong Avenue 

Shanghai, China 200120 

Phone: (86) 21-5877-3980 

Fax: (86) 21-5877-2928 

E-mail: marketing@evapcochina.com 

European Regional Office 

EVAPCO Europe, N.V. 

Heersterveldweg 19 

Industriezone, Tongeren-Oost 

3700 Tongeren, Belgium 

Phone: (32) 12-395029 

Fax: (32) 12-238527 

E-mail: evapco.europe@evapco.be 

Sales Office – Germany 

EVAPCO Europe GmbH 

Bovert 22 

D-40670 Meerbusch, Germany 

Phone: (49) 2159-69560 

Fax: (49) 2159-695611 

E-mail: sturies@evapco.de 

E VAPCO P RODUCTS ARE M ANUFACTURED W ORLDWIDE. 

EVAPCO...Taking Quality and Service to a Higher Level! 

EVAPCO Manufacturing Locations 

EVAPCO, Inc. 

5151 Allendale Lane 

Taneytown, MD 21787 USA 

Phone: (410) 756-2600 

Fax: (410) 756-6450 

E-mail: marketing@evapco.com 

EVAPCO Midwest 

1723 York Road 

Greenup, IL 62428 USA 

Phone: (217) 923-3431 

Fax: (217) 923-3300 

E-mail: evapcomw@rr1.net 

EVAPCO West 

1900 West Almond Ave. 

Madera, CA 93637 USA 

Phone: (559) 673-2207 

Fax: (559) 673-2378 

E-mail: contact@evapcowest.com 

Refrigeration Valves & Systems 

1520 Crosswind Dr. 

Bryan, TX 77808 USA 

Phone: (979) 778-0095 

Fax: (979) 778-0030 

E-mail: rvs@rvscorp.com 

McCormack Coil Company 

P.O. Box 1727 

6333 S.W. Lakeview Blvd. 

Lake Oswego, OR 97035 USA 

Phone: (503) 639-2137 

Fax: (503) 639-1800 

E-mail: mail@mmccoil.com 

EVAPCO Iowa 

Engineering & Sales Office 

1234 Brady Blvd. 

Owatonna, MN 55060 

Phone: (507) 446-8005 

Fax: (507) 446-8239 

E-mail: evapcomn@evapcomn.com 

Manufacturing Facility 

925 Quality Drive 

Lake View, Iowa 51450 USA 

Phone: (712) 657-3223 

Fax: (712) 657-3226 

EVAPCO Europe, N.V. 

Heersterveldweg 19 

Industriezone Tongeren-Oost 

3700 Tongeren, Belgium 

Phone: 32 (0)11-395029 

Fax: 32 (0)11-238527 

E-mail: evapco.europe@evapco.be 

EVAPCO Europe, S.r.l. 

Via Ciro Menotti 10 

20017 Passirana di Rho 

Milano, Italy 

Phone: (39) 02-939-9041 

Fax: (39) 02-935-00840 

E-mail: evapcoeurope@evapco.it 

EVAPCO Europe, S.r.l. 

Via Dosso 2 

23020 Piateda Sondrio Italy 

Tiba Engineering Industries Co. 

92 Asma Fahmi St., ARD El-Golf 

Heliopolis, Cairo, Egypt 

Phone: (202) 290-7483/(202) 291-3610 

Fax: (202) 290-0892/(202) 414-5611 

E-mail: manzgroup@tedata.net.eg 

Aqua-Cool Towers (Pty.) Ltd. 

34-42 Melbourne St. 

P.O. Box 436 

Riverstone, N.S.W. Australia 2765 

Phone: (61)29 627-3332 

Fax: (61)29 627-1715 

E-mail: sales@aquacoolingtowers.com.au 

Beijing Hezhong-EVAPCO 

Refrigeration Equipment Co., Ltd. 

Yan Qi Industrial Development District 

Huai Rou County 

Beijing, P.R. China - Code 101407 

Phone: (86)10 6166-7238 

Fax: (86)10 6166-7395 

E-mail: evapcobj@evapcochina.com 

Shanghai Hezhong-EVAPCO 

Refrigeration Co., Ltd. 

855 Yang Tai Road 

Bao Shan Area 

Shanghai, P.R. China - Code 201901 

Phone: (86)21 5680-5298 

Fax: (86)21 5680-6642 

E-mail: evapcosh@evapcochina.com 

EVAPCO S.A. (Pty.) Ltd. 

18 Quality Road 

Isando 1600 

Republic of South Africa 

Phone: (27)11 392-6630 

Fax: (27)11-392-6615 

E-mail: evapco@icon.co.za 

5M/1004/YGS Visit EVAPCO’s Website at: http://www.evapco.com 

Bulletin 250

Closed Circuit Coolers - Tasman Cooling Towers

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