EVAPCO AT 19-98 - User Manual

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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 bvba

Heersterveldweg 19

Industrieterrein Oost

3700 Tongeren, Belgium

Phone: (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 Rho

Milan, Italy

Phone: (39) 02 9399041

Fax: (39) 02 93500840

Email: evapcoeurope@evapco.it

EVAPCO Europe GmbH

Insterburger Straße, 18

D-40670 Meerbusch, Germany

Phone: (49) 2159-6956-0

Fax: (49) 2159-6956-11

Email: info@evapco.de

EUROPEAN

OPERATION AND MAINTENANCE INSTRUCTIONS

For 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 LSTE LPT PMTQ

Table of Contents

Questions and Answers

B
brendaaguilarAug 19, 2025
What to do if the makeup valve will not shut off in EVAPCO Accessories?
- C
  Christine DavisSep 12, 2025
  If the makeup valve won't shut off in your EVAPCO Accessories, it might be due to several reasons: First, high water pressure could be the culprit. Mechanical makeup valves need water pressure between 140 and 340 kPa to function correctly. If it's too high, install a pressure reducing valve. Second, the solenoid might be clogged with debris, so clean it out. Third, inspect the float or valve for damage and replace if necessary. Fourth, check the ball for leaks and replace it if needed.
E
Emily AlvaradoAug 22, 2025
Why is stainless steel rusting on my EVAPCO Accessories?
- K
  Katelyn CrossAug 22, 2025
  If you notice rust on your stainless steel EVAPCO Accessories, it's usually not the stainless steel itself corroding. Often, it's foreign material like welding slag on the surface, especially around coil connections, the cold water basin near support steel, and field-erected platforms. Remove these rust spots by cleaning the surface regularly with a stainless steel cleaner and a Scotch-Brite pad.
E
Elizabeth EspinozaAug 27, 2025
Why is water constantly blowing out of the overflow connection in EVAPCO Accessories?
- E
  erin41Aug 28, 2025
  If water is constantly blowing out of the overflow connection in your EVAPCO Accessories, especially on forced draft units, it's likely due to positive pressure in the casing section. To resolve this, pipe the overflow with a P-trap to an appropriate drain. Also, verify the actual operating level against the recommended levels in the O&M manual.
B
Brian LaneAug 30, 2025
How to fix unusual motor noise in EVAPCO AT 19-98?
- A
  Amber MayAug 30, 2025
  If you're hearing unusual motor noise in your EVAPCO Accessories, here's what you can do: * First, stop the motor and try to restart it. If it doesn't restart and seems to be single phasing, check the wiring, controls, and motor. * Second, check the motor connections against the wiring diagram. * Third, check the lubrication and replace any bad bearings. * Fourth, check the voltage and current of all three lines, correcting if necessary. * Fifth, check and correct bracket fits or the bearing. * Sixth, rebalance, reinstall, or replace the fan.
K
Kevin GeorgeSep 2, 2025
Why is the cooling tower cold water basin overflowing in my EVAPCO AT 19-98?
- B
  Brandon FreemanSep 2, 2025
  If the cooling tower cold water basin is overflowing in your EVAPCO Accessories, it could be due to a problem with the make-up line. Refer to the Makeup Valve or Electronic Water Level section for guidance. Alternatively, if it's a multi-cell unit, there might be an elevation issue. Ensure that multi-cell units are installed level to one another, as uneven installation can cause overflowing in one cell.
R
Ronnie LambSep 5, 2025
How to clean scaled inlet louvers on AT units of EVAPCO Accessories?
- E
  Eric WilsonSep 5, 2025
  If you observe scaled inlet louvers on your AT units of EVAPCO Accessories, note that this isn't necessarily a sign of a problem with the unit or water treatment. Avoid using a power washer or wire brush to remove the scale, as this could damage the louvers. Instead, remove the louver assemblies and soak them in the cold water basin of the unit. The water treatment chemicals will neutralize and dissolve the scale buildup. The soaking time depends on the severity of the scale.
H
Heather GomezSep 7, 2025
What to do if there is an incomplete spray pattern in EVAPCO Accessories?
- G
  Gregory ValdezSep 7, 2025
  If you notice an incomplete spray pattern in your EVAPCO Accessories, try these steps: * First, remove and clean the nozzles, and flush the water distribution system. * Second, visually verify the pump rotor rotation by turning the pump off and then on, and verify the amp draw. * Third, confirm that the inlet pressure at the header meets the recommended values. * Fourth, remove the strainer and clean it.
H
Heather AlexanderSep 10, 2025
How to fix low pan water level in EVAPCO AT 19-98 Accessories?
- C
  Cheryl GreenSep 10, 2025
  If the pan water level is low in your EVAPCO Accessories, it could be due to the electronic water level control float bulb not being set correctly. Refer to the EWLC Section for instructions. Alternatively, adjust the float ball up or down to achieve the proper water level. Note that the float ball is set to the operating level at the factory.
H
harrellmelindaSep 12, 2025
How to reduce fan noise in EVAPCO AT 19-98?
- M
  Matthew ClarkSep 13, 2025
  To address fan noise in EVAPCO Accessories, especially in induced draft models, check if the blade is rubbing inside the fan cylinder. If it is, adjust the cylinder to provide blade tip clearance.
J
Jonathan HuntNov 15, 2025
How to troubleshoot overamping fan motors in EVAPCO AT 19-98 Accessories?
- W
  William ParksNov 16, 2025
  To address overamping fan motors in EVAPCO Accessories: * First, for a forced draft unit, ensure the pump is running and water flows over the coil. The motor may over-amp if the pump is off and the unit wasn't designed for dry operation. * Second, for ducted forced draft units, ensure the design ESP matches the actual ESP. * Third, check that the pump rotation is correct. Incorrect rotation reduces water flow and static pressure. * Fourth, check the basin water level against the recommended level, keeping in mind that air density affects AMP readings. * Fifth, check the voltage across all three legs of the motor. * Sixth, ensure the motor is wired per the diagram and connections are tight. * Seventh, confirm the fan rotates correctly, switching leads if necessary. * Eighth...

Summary

Checklists

Initial and Seasonal Start-Up Checklist

General procedures for initial and seasonal start-up of the unit.

Maintenance Checklist

A checklist of routine maintenance tasks and their frequencies.

Seasonal Shut-Down Checklist

Procedures for shutting down the unit for extended periods.

Fan System

Fan Motor Bearings

Details on EVAPCO fan motor types and bearing lubrication.

Fan Shaft Ball Bearings

Lubrication intervals and recommended greases for fan shaft bearings.

Fan Belt Adjustment

Fan System - Capacity Control

Variable Frequency Drives

Utilizing VFDs for precise capacity control and operational benefits.

Water Treatment and Water Chemistry

Bleed or Blowdown

Galvanized Steel - Passivation

Critical initial passivation period for galvanized steel components.

Water Chemistry Parameters

Guidelines for maintaining water chemistry for different unit materials.

Control of Biological Contamination

Regular inspections to ensure microbiological control and prevent fouling.

Cleaning of Stainless Steel

Cold Weather Operation

Unit Accessories

Capacity Control Methods for Cold Weather Operation

Strategies for capacity control during cold weather to prevent icing.

Induced Draft Unit Capacity Control

Forced Draft Unit Capacity Control

Ice Management

Guidelines for managing ice build-up for operational continuity.

Troubleshooting

Overamping Fan Motors

Possible causes and remedies for fan motors drawing excessive current.

Unusual Motor Noise

Diagnosing and resolving unusual noises from the fan motor.

Incomplete Spray Pattern

Makeup Valve Will Not Shut Off

Troubleshooting issues with the water make-up valve not closing properly.

Low Pan Water Level

Electric Water Level Control Not Working

EVAPCO AT 19-98 Specifications

General

Brand	EVAPCO
Model	AT 19-98
Category	Accessories
Language	English

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