EasyManua.ls Logo

EVAPCO AT Series - User Manual

EVAPCO AT Series
58 pages
Save Page as PDF
Print Icon
To Next Page IconTo Next Page
To Next Page IconTo Next Page
Loading...
Operation and
Maintenance Instructions
For EVAPCO Closed Circuit Coolers and
Evaporative condensers
for LIFE
Internat iona l In stitute of
Ammo nia Refrigeration
www.iiar.org
Member of
M
O
T
O
R
A
N
D
D
R
I
V
E
W
A
R
R
A
N
T
Y
† Mark owned by the Cooling Technology Institute
†

Table of Contents

Other manuals for EVAPCO AT Series

Preview: Operation And Maintenance Instructions
Operation And Maintenance Instructions40 pages

Questions and Answers

  • R
    rrayAug 23, 2025
    What to do if the makeup valve will not shut off in EVAPCO Accessories?
    • M
      Marcia AlexanderAug 23, 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
    David MaddoxSep 5, 2025
    How to reduce fan noise in EVAPCO AT?
    • R
      romanheatherSep 5, 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.
  • S
    sbrownSep 4, 2025
    How to fix low pan water level in EVAPCO AT?
    • C
      Cathy WalkerSep 4, 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.
  • B
    Brittany ReynoldsSep 2, 2025
    What to do if there is an incomplete spray pattern in EVAPCO Accessories?
    • S
      Sydney ScottSep 2, 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.
  • N
    Nicholas GallagherSep 1, 2025
    How to clean scaled inlet louvers on AT units of EVAPCO AT Accessories?
    • R
      rweeksSep 1, 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
    Margaret PruittAug 30, 2025
    Why is the cooling tower cold water basin overflowing in my EVAPCO Accessories?
    • K
      Kaitlyn BairdAug 30, 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.
  • T
    Timothy GutierrezAug 29, 2025
    How to fix unusual motor noise in EVAPCO AT Accessories?
    • G
      George BrownAug 29, 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.
  • J
    Jessica WilliamsAug 27, 2025
    Why is water constantly blowing out of the overflow connection in EVAPCO AT Accessories?
    • R
      Ryan ParrishAug 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.
  • C
    Carla HolmesAug 25, 2025
    Why is stainless steel rusting on my EVAPCO AT?
    • J
      joytaylorAug 25, 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.

Summary

Introduction, Safety, and Terminology

Safety Precautions

Guidelines for safe operation, maintenance, and repair of equipment to prevent injury.

Start-Up Procedures and Checklist

General Start-Up Verification

Checks installation, safety interlocks, VFD settings, and water treatment plans.

Specific Start-Up Steps and Post-Energization Checks

Recommended Minimum Maintenance Schedule

Seasonal Shut-Down Checklist

Sequence of Operation: Wet;Evaporative Mode

Fan System Maintenance

Fan Motor and Shaft Bearing Lubrication

Guidance on lubricating fan motor and shaft bearings with recommended greases.

Fan Belt Adjustment Procedures

Induced Draft Motor Adjustment

Forced Draft Motor Adjustment

Fan System Capacity Control Methods

VFD Lockout and Resonant Frequencies

Two-Speed Motors and Operation Sequences

Recirculated Water System Routine Maintenance

Suction Strainer Cleaning

Procedure for cleaning the suction strainer in the cold water basin.

Cold Water Basin Maintenance

Operating Water Level Checks

Checking and maintaining the correct water level in the cold water basin.

Water Make-Up Valve and Distribution System Checks

Pump and Bleed-Off Valve Checks

Water Treatment and Chemistry Fundamentals

Water Chemistry Parameters and Biological Contamination Control

Cold Weather Operation Overview

Freeze Protection for Closed Circuit Cooler Coils

Unit Accessories and Cold Weather Capacity Control

Ice Management Strategies

Troubleshooting Common Issues

Fan;Motor and Spray System Problems

Pump;Valve and Water Level Problems

Material and Electric Water Level Control Issues

EVAPCO AT Series Specifications

General IconGeneral
BrandEVAPCO
ModelAT Series
CategoryAccessories
LanguageEnglish

Related product manuals