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EVAPCO AT 112-012 - 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

  • A
    Ashley MorenoAug 19, 2025
    What to do if the makeup valve will not shut off in EVAPCO Accessories?
    • J
      jason67Aug 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.
  • M
    Melanie McgrathAug 22, 2025
    Why is stainless steel rusting on my EVAPCO AT 112-012?
    • E
      Eric JonesAug 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 MccallAug 27, 2025
    Why is water constantly blowing out of the overflow connection in EVAPCO Accessories?
    • K
      Kathleen WilsonAug 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.
  • S
    Susan MeyersAug 30, 2025
    How to fix unusual motor noise in EVAPCO AT 112-012 Accessories?
    • D
      Debra WongAug 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.
  • B
    Brittany ScottSep 2, 2025
    Why is the cooling tower cold water basin overflowing in my EVAPCO AT 112-012?
    • M
      Marc DavisSep 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
    Richard FriedmanSep 5, 2025
    How to clean scaled inlet louvers on AT units of EVAPCO Accessories?
    • K
      Kevin RobinsonSep 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.
  • J
    jessicalewisSep 8, 2025
    What to do if there is an incomplete spray pattern in EVAPCO Accessories?
    • M
      Michael DoughertySep 8, 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.
  • L
    lhowardSep 12, 2025
    How to fix low pan water level in EVAPCO AT 112-012 Accessories?
    • A
      Ashley PooleSep 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.
  • J
    Jonathan FitzgeraldSep 13, 2025
    How to reduce fan noise in EVAPCO AT 112-012 Accessories?
    • A
      Amanda SantosSep 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.
  • D
    Daniel MitchellNov 16, 2025
    How to troubleshoot overamping fan motors in EVAPCO AT 112-012 Accessories?
    • J
      Jodi MartinezNov 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

Safety Precautions and Risks

Installation Precautions

Initial and Seasonal Start-Up Checklist

Start-Up Procedures

Detailed checklist steps for performing initial and seasonal unit start-up.

Maintenance Checklist

Maintenance Checklist (Optional Accessories)

Seasonal Shut-Down Checklist

Basic Cooling Tower Sequence of Operation

Fan System

Fan Motor Bearings

Fan Shaft Ball Bearings

Fan Belt and Sleeve Bearing Maintenance

Fan Belt Adjustment

Motor Adjustment and Alignment

Fan System Capacity Control

Fan Motor Cycling

Two Speed Motors

Variable Frequency Drives (VFDs)

Controlling capacity precisely using Variable Frequency Drives (VFDs).

Identify and Lock-out Harmful Resonant Frequencies

Recirculated Water System Routine Maintenance

Suction Strainer Cleaning

Cold Water Basin

Operating Water Level

Water Make Up Valve

Drift Eliminators

Pressurized Water Distribution Systems

Bleed-Off Valve

Water Treatment and Chemistry

Bleed or Blowdown

Importance and methods of bleed or blowdown for maintaining water efficiency.

Galvanized Steel Passivation

Procedure for passivating galvanized steel to prevent premature failure (white rust).

Water Chemistry Parameters

Control of Biological Contamination

Stainless Steel Properties

Stainless Steel Maintenance

Maintaining Stainless Steel Appearance

Stainless Steel Cleaning Procedures

Methods for cleaning stainless steel based on the type and severity of contamination.

Cold Weather Operation

Unit Layout and Piping

Capacity Control Methods for Cold Weather

Induced Draft Unit Capacity Control

Capacity control strategies for induced draft units in cold weather conditions.

Forced Draft Unit Capacity Control

Ice Management

Induced Draft Unit Ice Management

Managing ice buildup in induced draft units using fan cycling or defrost cycles.

Forced Draft Unit Ice Management

Troubleshooting

Overamping Fan Motors

Diagnosing and resolving issues causing fan motors to over-amper.

Unusual Motor Noise

Incomplete Spray Pattern

Fan and Louver Maintenance Issues

Makeup Valve and Overflow Problems

Cold Water Basin Overflowing

Low Pan Water Level

Rusting Stainless Steel

Electric Water Level Control Malfunction

EVAPCO AT 112-012 Specifications

General IconGeneral
BrandEVAPCO
ModelAT 112-012
CategoryAccessories
LanguageEnglish

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