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EVAPCO AT 14-912 - 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

  • M
    Monica MaloneAug 19, 2025
    What to do if the makeup valve will not shut off in EVAPCO AT 14-912?
    • V
      Victoria ThompsonAug 19, 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.
  • D
    Danielle WebsterAug 22, 2025
    Why is stainless steel rusting on my EVAPCO AT 14-912 Accessories?
    • D
      David GonzalezAug 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.
  • A
    Alan PattersonAug 27, 2025
    Why is water constantly blowing out of the overflow connection in EVAPCO AT 14-912 Accessories?
    • M
      Martin CastilloAug 27, 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.
  • K
    Kristi RandallAug 30, 2025
    How to fix unusual motor noise in EVAPCO Accessories?
    • T
      Tonya PonceAug 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.
  • L
    Lisa ParsonsSep 2, 2025
    Why is the cooling tower cold water basin overflowing in my EVAPCO AT 14-912 Accessories?
    • A
      Anne SantanaSep 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.
  • L
    Lindsey WilsonSep 4, 2025
    How to clean scaled inlet louvers on AT units of EVAPCO AT 14-912 Accessories?
    • K
      Katherine BrownSep 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.
  • M
    Michael LambSep 7, 2025
    What to do if there is an incomplete spray pattern in EVAPCO AT 14-912 Accessories?
    • S
      Shelby BrownSep 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
    hfigueroaSep 12, 2025
    How to fix low pan water level in EVAPCO AT 14-912 Accessories?
    • C
      christopherleeSep 12, 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.
  • T
    Tracey SimmonsSep 13, 2025
    How to reduce fan noise in EVAPCO AT 14-912?
    • X
      xwadeSep 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
    johntorresNov 16, 2025
    How to troubleshoot overamping fan motors in EVAPCO AT 14-912?
    • G
      gabrielnewmanNov 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

Introduction

General Safety Guidelines

Provides essential safety guidelines for operating and maintaining the cooling equipment.

Installation and Storage Precautions

Installation Requirements

Initial and Seasonal Start-Up Checklist

Pre-Start Checks and Procedures

Maintenance Checklist

Scheduled Maintenance Tasks

Seasonal Shut-Down Checklist

Shut-Down Procedures

Basic Cooling Tower Sequence of Operation

System States and Control Modes

Fan System Components

Fan Motor and Shaft Bearings

Fan Belt Adjustment

Belt Tensioning Procedures

Fan System - Capacity Control

Capacity Control Methods

Covers fan motor cycling, two-speed motors, and variable frequency drives for capacity control.

Resonant Frequencies and Water System Maintenance

Identifying and Locking Out Resonant Frequencies

Procedures for identifying and locking out resonant frequencies in VFD systems.

Suction Strainer Cleaning

Water Treatment and Water Chemistry

Bleed or Blowdown for Water Purity

Galvanized Steel Passivation

Procedure for passivating galvanized steel to prevent white rust during start-up.

Water Chemistry Parameters and Biological Control

Recommended Water Chemistry Guidelines

Table of recommended water chemistry parameters for different materials.

Microbiological Control Procedures

Importance of regular inspection and control of microbial populations to prevent fouling.

Gray Water, Air Contamination, and Stainless Steel

Cold Weather Operation

Cold Weather Unit Considerations

Cold Weather Capacity Control and Accessories

Capacity Control Methods for Cold Weather

Strategies for controlling capacity in cold weather for both unit types.

Cold Weather Accessories

Ice Management

Ice Management for Induced Draft Units

Methods for managing ice buildup in induced draft units during cold weather.

Ice Management for Forced Draft Units

Strategies for managing ice formation in forced draft units.

Troubleshooting: Fan Motors and Spray Patterns

Fan Motor Issues

Diagnosing and resolving problems with fan motors, including overamping and noise.

Spray Pattern Problems

Diagnosing and fixing issues with the water spray pattern.

Troubleshooting: Noise, Scaling, and Valves

Fan Noise and Louver Scaling

Troubleshooting fan noise and cleaning scaled inlet louvers.

Water Valve and Overflow Issues

Troubleshooting: Water Levels and Stainless Steel

Water Level Control Faults

Resolving low pan water levels and electric level control faults.

Stainless Steel Rusting and Cleaning

EVAPCO AT 14-912 Specifications

General IconGeneral
BrandEVAPCO
ModelAT 14-912
CategoryAccessories
LanguageEnglish

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